1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/bitmap.h>
3 #include <linux/kernel.h>
4 #include <linux/module.h>
5 #include <linux/interrupt.h>
7 #include <linux/spinlock.h>
8 #include <linux/list.h>
9 #include <linux/device.h>
10 #include <linux/err.h>
11 #include <linux/debugfs.h>
12 #include <linux/seq_file.h>
13 #include <linux/gpio.h>
14 #include <linux/idr.h>
15 #include <linux/slab.h>
16 #include <linux/acpi.h>
17 #include <linux/gpio/driver.h>
18 #include <linux/gpio/machine.h>
19 #include <linux/pinctrl/consumer.h>
20 #include <linux/cdev.h>
22 #include <linux/uaccess.h>
23 #include <linux/compat.h>
24 #include <linux/anon_inodes.h>
25 #include <linux/file.h>
26 #include <linux/kfifo.h>
27 #include <linux/poll.h>
28 #include <linux/timekeeping.h>
29 #include <uapi/linux/gpio.h>
32 #include "gpiolib-of.h"
33 #include "gpiolib-acpi.h"
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/gpio.h>
38 /* Implementation infrastructure for GPIO interfaces.
40 * The GPIO programming interface allows for inlining speed-critical
41 * get/set operations for common cases, so that access to SOC-integrated
42 * GPIOs can sometimes cost only an instruction or two per bit.
46 /* When debugging, extend minimal trust to callers and platform code.
47 * Also emit diagnostic messages that may help initial bringup, when
48 * board setup or driver bugs are most common.
50 * Otherwise, minimize overhead in what may be bitbanging codepaths.
53 #define extra_checks 1
55 #define extra_checks 0
58 /* Device and char device-related information */
59 static DEFINE_IDA(gpio_ida);
60 static dev_t gpio_devt;
61 #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */
62 static struct bus_type gpio_bus_type = {
67 * Number of GPIOs to use for the fast path in set array
69 #define FASTPATH_NGPIO CONFIG_GPIOLIB_FASTPATH_LIMIT
71 /* gpio_lock prevents conflicts during gpio_desc[] table updates.
72 * While any GPIO is requested, its gpio_chip is not removable;
73 * each GPIO's "requested" flag serves as a lock and refcount.
75 DEFINE_SPINLOCK(gpio_lock);
77 static DEFINE_MUTEX(gpio_lookup_lock);
78 static LIST_HEAD(gpio_lookup_list);
79 LIST_HEAD(gpio_devices);
81 static DEFINE_MUTEX(gpio_machine_hogs_mutex);
82 static LIST_HEAD(gpio_machine_hogs);
84 static void gpiochip_free_hogs(struct gpio_chip *chip);
85 static int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
86 struct lock_class_key *lock_key,
87 struct lock_class_key *request_key);
88 static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip);
89 static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip);
90 static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip);
92 static bool gpiolib_initialized;
94 static inline void desc_set_label(struct gpio_desc *d, const char *label)
100 * gpio_to_desc - Convert a GPIO number to its descriptor
101 * @gpio: global GPIO number
104 * The GPIO descriptor associated with the given GPIO, or %NULL if no GPIO
105 * with the given number exists in the system.
107 struct gpio_desc *gpio_to_desc(unsigned gpio)
109 struct gpio_device *gdev;
112 spin_lock_irqsave(&gpio_lock, flags);
114 list_for_each_entry(gdev, &gpio_devices, list) {
115 if (gdev->base <= gpio &&
116 gdev->base + gdev->ngpio > gpio) {
117 spin_unlock_irqrestore(&gpio_lock, flags);
118 return &gdev->descs[gpio - gdev->base];
122 spin_unlock_irqrestore(&gpio_lock, flags);
124 if (!gpio_is_valid(gpio))
125 WARN(1, "invalid GPIO %d\n", gpio);
129 EXPORT_SYMBOL_GPL(gpio_to_desc);
132 * gpiochip_get_desc - get the GPIO descriptor corresponding to the given
133 * hardware number for this chip
135 * @hwnum: hardware number of the GPIO for this chip
138 * A pointer to the GPIO descriptor or %ERR_PTR(-EINVAL) if no GPIO exists
139 * in the given chip for the specified hardware number.
141 struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
144 struct gpio_device *gdev = chip->gpiodev;
146 if (hwnum >= gdev->ngpio)
147 return ERR_PTR(-EINVAL);
149 return &gdev->descs[hwnum];
153 * desc_to_gpio - convert a GPIO descriptor to the integer namespace
154 * @desc: GPIO descriptor
156 * This should disappear in the future but is needed since we still
157 * use GPIO numbers for error messages and sysfs nodes.
160 * The global GPIO number for the GPIO specified by its descriptor.
162 int desc_to_gpio(const struct gpio_desc *desc)
164 return desc->gdev->base + (desc - &desc->gdev->descs[0]);
166 EXPORT_SYMBOL_GPL(desc_to_gpio);
170 * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs
171 * @desc: descriptor to return the chip of
173 struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
175 if (!desc || !desc->gdev)
177 return desc->gdev->chip;
179 EXPORT_SYMBOL_GPL(gpiod_to_chip);
181 /* dynamic allocation of GPIOs, e.g. on a hotplugged device */
182 static int gpiochip_find_base(int ngpio)
184 struct gpio_device *gdev;
185 int base = ARCH_NR_GPIOS - ngpio;
187 list_for_each_entry_reverse(gdev, &gpio_devices, list) {
188 /* found a free space? */
189 if (gdev->base + gdev->ngpio <= base)
192 /* nope, check the space right before the chip */
193 base = gdev->base - ngpio;
196 if (gpio_is_valid(base)) {
197 pr_debug("%s: found new base at %d\n", __func__, base);
200 pr_err("%s: cannot find free range\n", __func__);
206 * gpiod_get_direction - return the current direction of a GPIO
207 * @desc: GPIO to get the direction of
209 * Returns 0 for output, 1 for input, or an error code in case of error.
211 * This function may sleep if gpiod_cansleep() is true.
213 int gpiod_get_direction(struct gpio_desc *desc)
215 struct gpio_chip *chip;
219 chip = gpiod_to_chip(desc);
220 offset = gpio_chip_hwgpio(desc);
222 if (!chip->get_direction)
225 ret = chip->get_direction(chip, offset);
227 /* GPIOF_DIR_IN, or other positive */
229 clear_bit(FLAG_IS_OUT, &desc->flags);
233 set_bit(FLAG_IS_OUT, &desc->flags);
237 EXPORT_SYMBOL_GPL(gpiod_get_direction);
240 * Add a new chip to the global chips list, keeping the list of chips sorted
241 * by range(means [base, base + ngpio - 1]) order.
243 * Return -EBUSY if the new chip overlaps with some other chip's integer
246 static int gpiodev_add_to_list(struct gpio_device *gdev)
248 struct gpio_device *prev, *next;
250 if (list_empty(&gpio_devices)) {
251 /* initial entry in list */
252 list_add_tail(&gdev->list, &gpio_devices);
256 next = list_entry(gpio_devices.next, struct gpio_device, list);
257 if (gdev->base + gdev->ngpio <= next->base) {
258 /* add before first entry */
259 list_add(&gdev->list, &gpio_devices);
263 prev = list_entry(gpio_devices.prev, struct gpio_device, list);
264 if (prev->base + prev->ngpio <= gdev->base) {
265 /* add behind last entry */
266 list_add_tail(&gdev->list, &gpio_devices);
270 list_for_each_entry_safe(prev, next, &gpio_devices, list) {
271 /* at the end of the list */
272 if (&next->list == &gpio_devices)
275 /* add between prev and next */
276 if (prev->base + prev->ngpio <= gdev->base
277 && gdev->base + gdev->ngpio <= next->base) {
278 list_add(&gdev->list, &prev->list);
283 dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n");
288 * Convert a GPIO name to its descriptor
290 static struct gpio_desc *gpio_name_to_desc(const char * const name)
292 struct gpio_device *gdev;
295 spin_lock_irqsave(&gpio_lock, flags);
297 list_for_each_entry(gdev, &gpio_devices, list) {
300 for (i = 0; i != gdev->ngpio; ++i) {
301 struct gpio_desc *desc = &gdev->descs[i];
303 if (!desc->name || !name)
306 if (!strcmp(desc->name, name)) {
307 spin_unlock_irqrestore(&gpio_lock, flags);
313 spin_unlock_irqrestore(&gpio_lock, flags);
319 * Takes the names from gc->names and checks if they are all unique. If they
320 * are, they are assigned to their gpio descriptors.
322 * Warning if one of the names is already used for a different GPIO.
324 static int gpiochip_set_desc_names(struct gpio_chip *gc)
326 struct gpio_device *gdev = gc->gpiodev;
332 /* First check all names if they are unique */
333 for (i = 0; i != gc->ngpio; ++i) {
334 struct gpio_desc *gpio;
336 gpio = gpio_name_to_desc(gc->names[i]);
339 "Detected name collision for GPIO name '%s'\n",
343 /* Then add all names to the GPIO descriptors */
344 for (i = 0; i != gc->ngpio; ++i)
345 gdev->descs[i].name = gc->names[i];
350 static unsigned long *gpiochip_allocate_mask(struct gpio_chip *chip)
354 p = bitmap_alloc(chip->ngpio, GFP_KERNEL);
358 /* Assume by default all GPIOs are valid */
359 bitmap_fill(p, chip->ngpio);
364 static int gpiochip_alloc_valid_mask(struct gpio_chip *gc)
366 if (!(of_gpio_need_valid_mask(gc) || gc->init_valid_mask))
369 gc->valid_mask = gpiochip_allocate_mask(gc);
376 static int gpiochip_init_valid_mask(struct gpio_chip *gc)
378 if (gc->init_valid_mask)
379 return gc->init_valid_mask(gc,
386 static void gpiochip_free_valid_mask(struct gpio_chip *gpiochip)
388 bitmap_free(gpiochip->valid_mask);
389 gpiochip->valid_mask = NULL;
392 bool gpiochip_line_is_valid(const struct gpio_chip *gpiochip,
395 /* No mask means all valid */
396 if (likely(!gpiochip->valid_mask))
398 return test_bit(offset, gpiochip->valid_mask);
400 EXPORT_SYMBOL_GPL(gpiochip_line_is_valid);
403 * GPIO line handle management
407 * struct linehandle_state - contains the state of a userspace handle
408 * @gdev: the GPIO device the handle pertains to
409 * @label: consumer label used to tag descriptors
410 * @descs: the GPIO descriptors held by this handle
411 * @numdescs: the number of descriptors held in the descs array
413 struct linehandle_state {
414 struct gpio_device *gdev;
416 struct gpio_desc *descs[GPIOHANDLES_MAX];
420 #define GPIOHANDLE_REQUEST_VALID_FLAGS \
421 (GPIOHANDLE_REQUEST_INPUT | \
422 GPIOHANDLE_REQUEST_OUTPUT | \
423 GPIOHANDLE_REQUEST_ACTIVE_LOW | \
424 GPIOHANDLE_REQUEST_PULL_UP | \
425 GPIOHANDLE_REQUEST_PULL_DOWN | \
426 GPIOHANDLE_REQUEST_OPEN_DRAIN | \
427 GPIOHANDLE_REQUEST_OPEN_SOURCE)
429 static long linehandle_ioctl(struct file *filep, unsigned int cmd,
432 struct linehandle_state *lh = filep->private_data;
433 void __user *ip = (void __user *)arg;
434 struct gpiohandle_data ghd;
435 DECLARE_BITMAP(vals, GPIOHANDLES_MAX);
438 if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
439 /* NOTE: It's ok to read values of output lines. */
440 int ret = gpiod_get_array_value_complex(false,
449 memset(&ghd, 0, sizeof(ghd));
450 for (i = 0; i < lh->numdescs; i++)
451 ghd.values[i] = test_bit(i, vals);
453 if (copy_to_user(ip, &ghd, sizeof(ghd)))
457 } else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) {
459 * All line descriptors were created at once with the same
460 * flags so just check if the first one is really output.
462 if (!test_bit(FLAG_IS_OUT, &lh->descs[0]->flags))
465 if (copy_from_user(&ghd, ip, sizeof(ghd)))
468 /* Clamp all values to [0,1] */
469 for (i = 0; i < lh->numdescs; i++)
470 __assign_bit(i, vals, ghd.values[i]);
472 /* Reuse the array setting function */
473 return gpiod_set_array_value_complex(false,
484 static long linehandle_ioctl_compat(struct file *filep, unsigned int cmd,
487 return linehandle_ioctl(filep, cmd, (unsigned long)compat_ptr(arg));
491 static int linehandle_release(struct inode *inode, struct file *filep)
493 struct linehandle_state *lh = filep->private_data;
494 struct gpio_device *gdev = lh->gdev;
497 for (i = 0; i < lh->numdescs; i++)
498 gpiod_free(lh->descs[i]);
501 put_device(&gdev->dev);
505 static const struct file_operations linehandle_fileops = {
506 .release = linehandle_release,
507 .owner = THIS_MODULE,
508 .llseek = noop_llseek,
509 .unlocked_ioctl = linehandle_ioctl,
511 .compat_ioctl = linehandle_ioctl_compat,
515 static int linehandle_create(struct gpio_device *gdev, void __user *ip)
517 struct gpiohandle_request handlereq;
518 struct linehandle_state *lh;
520 int fd, i, count = 0, ret;
523 if (copy_from_user(&handlereq, ip, sizeof(handlereq)))
525 if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX))
528 lflags = handlereq.flags;
530 /* Return an error if an unknown flag is set */
531 if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS)
535 * Do not allow both INPUT & OUTPUT flags to be set as they are
538 if ((lflags & GPIOHANDLE_REQUEST_INPUT) &&
539 (lflags & GPIOHANDLE_REQUEST_OUTPUT))
543 * Do not allow OPEN_SOURCE & OPEN_DRAIN flags in a single request. If
544 * the hardware actually supports enabling both at the same time the
545 * electrical result would be disastrous.
547 if ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) &&
548 (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))
551 /* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */
552 if (!(lflags & GPIOHANDLE_REQUEST_OUTPUT) &&
553 ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||
554 (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)))
557 lh = kzalloc(sizeof(*lh), GFP_KERNEL);
561 get_device(&gdev->dev);
563 /* Make sure this is terminated */
564 handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0';
565 if (strlen(handlereq.consumer_label)) {
566 lh->label = kstrdup(handlereq.consumer_label,
574 /* Request each GPIO */
575 for (i = 0; i < handlereq.lines; i++) {
576 u32 offset = handlereq.lineoffsets[i];
577 struct gpio_desc *desc;
579 if (offset >= gdev->ngpio) {
584 desc = &gdev->descs[offset];
585 ret = gpiod_request(desc, lh->label);
591 if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
592 set_bit(FLAG_ACTIVE_LOW, &desc->flags);
593 if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN)
594 set_bit(FLAG_OPEN_DRAIN, &desc->flags);
595 if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)
596 set_bit(FLAG_OPEN_SOURCE, &desc->flags);
597 if (lflags & GPIOHANDLE_REQUEST_PULL_DOWN)
598 set_bit(FLAG_PULL_DOWN, &desc->flags);
599 if (lflags & GPIOHANDLE_REQUEST_PULL_UP)
600 set_bit(FLAG_PULL_UP, &desc->flags);
602 ret = gpiod_set_transitory(desc, false);
607 * Lines have to be requested explicitly for input
608 * or output, else the line will be treated "as is".
610 if (lflags & GPIOHANDLE_REQUEST_OUTPUT) {
611 int val = !!handlereq.default_values[i];
613 ret = gpiod_direction_output(desc, val);
616 } else if (lflags & GPIOHANDLE_REQUEST_INPUT) {
617 ret = gpiod_direction_input(desc);
621 dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
624 /* Let i point at the last handle */
626 lh->numdescs = handlereq.lines;
628 fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
634 file = anon_inode_getfile("gpio-linehandle",
637 O_RDONLY | O_CLOEXEC);
640 goto out_put_unused_fd;
644 if (copy_to_user(ip, &handlereq, sizeof(handlereq))) {
646 * fput() will trigger the release() callback, so do not go onto
647 * the regular error cleanup path here.
654 fd_install(fd, file);
656 dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n",
664 for (i = 0; i < count; i++)
665 gpiod_free(lh->descs[i]);
669 put_device(&gdev->dev);
674 * GPIO line event management
678 * struct lineevent_state - contains the state of a userspace event
679 * @gdev: the GPIO device the event pertains to
680 * @label: consumer label used to tag descriptors
681 * @desc: the GPIO descriptor held by this event
682 * @eflags: the event flags this line was requested with
683 * @irq: the interrupt that trigger in response to events on this GPIO
684 * @wait: wait queue that handles blocking reads of events
685 * @events: KFIFO for the GPIO events
686 * @read_lock: mutex lock to protect reads from colliding with adding
687 * new events to the FIFO
688 * @timestamp: cache for the timestamp storing it between hardirq
689 * and IRQ thread, used to bring the timestamp close to the actual
692 struct lineevent_state {
693 struct gpio_device *gdev;
695 struct gpio_desc *desc;
698 wait_queue_head_t wait;
699 DECLARE_KFIFO(events, struct gpioevent_data, 16);
700 struct mutex read_lock;
704 #define GPIOEVENT_REQUEST_VALID_FLAGS \
705 (GPIOEVENT_REQUEST_RISING_EDGE | \
706 GPIOEVENT_REQUEST_FALLING_EDGE)
708 static __poll_t lineevent_poll(struct file *filep,
709 struct poll_table_struct *wait)
711 struct lineevent_state *le = filep->private_data;
714 poll_wait(filep, &le->wait, wait);
716 if (!kfifo_is_empty(&le->events))
717 events = EPOLLIN | EPOLLRDNORM;
723 static ssize_t lineevent_read(struct file *filep,
728 struct lineevent_state *le = filep->private_data;
732 if (count < sizeof(struct gpioevent_data))
736 if (kfifo_is_empty(&le->events)) {
737 if (filep->f_flags & O_NONBLOCK)
740 ret = wait_event_interruptible(le->wait,
741 !kfifo_is_empty(&le->events));
746 if (mutex_lock_interruptible(&le->read_lock))
748 ret = kfifo_to_user(&le->events, buf, count, &copied);
749 mutex_unlock(&le->read_lock);
755 * If we couldn't read anything from the fifo (a different
756 * thread might have been faster) we either return -EAGAIN if
757 * the file descriptor is non-blocking, otherwise we go back to
758 * sleep and wait for more data to arrive.
760 if (copied == 0 && (filep->f_flags & O_NONBLOCK))
763 } while (copied == 0);
768 static int lineevent_release(struct inode *inode, struct file *filep)
770 struct lineevent_state *le = filep->private_data;
771 struct gpio_device *gdev = le->gdev;
773 free_irq(le->irq, le);
774 gpiod_free(le->desc);
777 put_device(&gdev->dev);
781 static long lineevent_ioctl(struct file *filep, unsigned int cmd,
784 struct lineevent_state *le = filep->private_data;
785 void __user *ip = (void __user *)arg;
786 struct gpiohandle_data ghd;
789 * We can get the value for an event line but not set it,
790 * because it is input by definition.
792 if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
795 memset(&ghd, 0, sizeof(ghd));
797 val = gpiod_get_value_cansleep(le->desc);
802 if (copy_to_user(ip, &ghd, sizeof(ghd)))
811 static long lineevent_ioctl_compat(struct file *filep, unsigned int cmd,
814 return lineevent_ioctl(filep, cmd, (unsigned long)compat_ptr(arg));
818 static const struct file_operations lineevent_fileops = {
819 .release = lineevent_release,
820 .read = lineevent_read,
821 .poll = lineevent_poll,
822 .owner = THIS_MODULE,
823 .llseek = noop_llseek,
824 .unlocked_ioctl = lineevent_ioctl,
826 .compat_ioctl = lineevent_ioctl_compat,
830 static irqreturn_t lineevent_irq_thread(int irq, void *p)
832 struct lineevent_state *le = p;
833 struct gpioevent_data ge;
836 /* Do not leak kernel stack to userspace */
837 memset(&ge, 0, sizeof(ge));
840 * We may be running from a nested threaded interrupt in which case
841 * we didn't get the timestamp from lineevent_irq_handler().
844 ge.timestamp = ktime_get_real_ns();
846 ge.timestamp = le->timestamp;
848 if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE
849 && le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) {
850 int level = gpiod_get_value_cansleep(le->desc);
852 /* Emit low-to-high event */
853 ge.id = GPIOEVENT_EVENT_RISING_EDGE;
855 /* Emit high-to-low event */
856 ge.id = GPIOEVENT_EVENT_FALLING_EDGE;
857 } else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE) {
858 /* Emit low-to-high event */
859 ge.id = GPIOEVENT_EVENT_RISING_EDGE;
860 } else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) {
861 /* Emit high-to-low event */
862 ge.id = GPIOEVENT_EVENT_FALLING_EDGE;
867 ret = kfifo_put(&le->events, ge);
869 wake_up_poll(&le->wait, EPOLLIN);
874 static irqreturn_t lineevent_irq_handler(int irq, void *p)
876 struct lineevent_state *le = p;
879 * Just store the timestamp in hardirq context so we get it as
880 * close in time as possible to the actual event.
882 le->timestamp = ktime_get_real_ns();
884 return IRQ_WAKE_THREAD;
887 static int lineevent_create(struct gpio_device *gdev, void __user *ip)
889 struct gpioevent_request eventreq;
890 struct lineevent_state *le;
891 struct gpio_desc *desc;
900 if (copy_from_user(&eventreq, ip, sizeof(eventreq)))
903 offset = eventreq.lineoffset;
904 lflags = eventreq.handleflags;
905 eflags = eventreq.eventflags;
907 if (offset >= gdev->ngpio)
910 /* Return an error if a unknown flag is set */
911 if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) ||
912 (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS))
915 /* This is just wrong: we don't look for events on output lines */
916 if ((lflags & GPIOHANDLE_REQUEST_OUTPUT) ||
917 (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||
918 (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))
921 le = kzalloc(sizeof(*le), GFP_KERNEL);
925 get_device(&gdev->dev);
927 /* Make sure this is terminated */
928 eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0';
929 if (strlen(eventreq.consumer_label)) {
930 le->label = kstrdup(eventreq.consumer_label,
938 desc = &gdev->descs[offset];
939 ret = gpiod_request(desc, le->label);
945 if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
946 set_bit(FLAG_ACTIVE_LOW, &desc->flags);
948 ret = gpiod_direction_input(desc);
952 le->irq = gpiod_to_irq(desc);
958 if (eflags & GPIOEVENT_REQUEST_RISING_EDGE)
959 irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
960 IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
961 if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE)
962 irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
963 IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
964 irqflags |= IRQF_ONESHOT;
966 INIT_KFIFO(le->events);
967 init_waitqueue_head(&le->wait);
968 mutex_init(&le->read_lock);
970 /* Request a thread to read the events */
971 ret = request_threaded_irq(le->irq,
972 lineevent_irq_handler,
973 lineevent_irq_thread,
980 fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
986 file = anon_inode_getfile("gpio-event",
989 O_RDONLY | O_CLOEXEC);
992 goto out_put_unused_fd;
996 if (copy_to_user(ip, &eventreq, sizeof(eventreq))) {
998 * fput() will trigger the release() callback, so do not go onto
999 * the regular error cleanup path here.
1006 fd_install(fd, file);
1013 free_irq(le->irq, le);
1015 gpiod_free(le->desc);
1020 put_device(&gdev->dev);
1025 * gpio_ioctl() - ioctl handler for the GPIO chardev
1027 static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1029 struct gpio_device *gdev = filp->private_data;
1030 struct gpio_chip *chip = gdev->chip;
1031 void __user *ip = (void __user *)arg;
1033 /* We fail any subsequent ioctl():s when the chip is gone */
1037 /* Fill in the struct and pass to userspace */
1038 if (cmd == GPIO_GET_CHIPINFO_IOCTL) {
1039 struct gpiochip_info chipinfo;
1041 memset(&chipinfo, 0, sizeof(chipinfo));
1043 strncpy(chipinfo.name, dev_name(&gdev->dev),
1044 sizeof(chipinfo.name));
1045 chipinfo.name[sizeof(chipinfo.name)-1] = '\0';
1046 strncpy(chipinfo.label, gdev->label,
1047 sizeof(chipinfo.label));
1048 chipinfo.label[sizeof(chipinfo.label)-1] = '\0';
1049 chipinfo.lines = gdev->ngpio;
1050 if (copy_to_user(ip, &chipinfo, sizeof(chipinfo)))
1053 } else if (cmd == GPIO_GET_LINEINFO_IOCTL) {
1054 struct gpioline_info lineinfo;
1055 struct gpio_desc *desc;
1057 if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
1059 if (lineinfo.line_offset >= gdev->ngpio)
1062 desc = &gdev->descs[lineinfo.line_offset];
1064 strncpy(lineinfo.name, desc->name,
1065 sizeof(lineinfo.name));
1066 lineinfo.name[sizeof(lineinfo.name)-1] = '\0';
1068 lineinfo.name[0] = '\0';
1071 strncpy(lineinfo.consumer, desc->label,
1072 sizeof(lineinfo.consumer));
1073 lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0';
1075 lineinfo.consumer[0] = '\0';
1079 * Userspace only need to know that the kernel is using
1080 * this GPIO so it can't use it.
1083 if (test_bit(FLAG_REQUESTED, &desc->flags) ||
1084 test_bit(FLAG_IS_HOGGED, &desc->flags) ||
1085 test_bit(FLAG_USED_AS_IRQ, &desc->flags) ||
1086 test_bit(FLAG_EXPORT, &desc->flags) ||
1087 test_bit(FLAG_SYSFS, &desc->flags) ||
1088 !pinctrl_gpio_can_use_line(chip->base + lineinfo.line_offset))
1089 lineinfo.flags |= GPIOLINE_FLAG_KERNEL;
1090 if (test_bit(FLAG_IS_OUT, &desc->flags))
1091 lineinfo.flags |= GPIOLINE_FLAG_IS_OUT;
1092 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
1093 lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW;
1094 if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
1095 lineinfo.flags |= (GPIOLINE_FLAG_OPEN_DRAIN |
1096 GPIOLINE_FLAG_IS_OUT);
1097 if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
1098 lineinfo.flags |= (GPIOLINE_FLAG_OPEN_SOURCE |
1099 GPIOLINE_FLAG_IS_OUT);
1100 if (test_bit(FLAG_PULL_DOWN, &desc->flags))
1101 lineinfo.flags |= GPIOLINE_FLAG_PULL_DOWN;
1102 if (test_bit(FLAG_PULL_UP, &desc->flags))
1103 lineinfo.flags |= GPIOLINE_FLAG_PULL_UP;
1105 if (copy_to_user(ip, &lineinfo, sizeof(lineinfo)))
1108 } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) {
1109 return linehandle_create(gdev, ip);
1110 } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) {
1111 return lineevent_create(gdev, ip);
1116 #ifdef CONFIG_COMPAT
1117 static long gpio_ioctl_compat(struct file *filp, unsigned int cmd,
1120 return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
1125 * gpio_chrdev_open() - open the chardev for ioctl operations
1126 * @inode: inode for this chardev
1127 * @filp: file struct for storing private data
1128 * Returns 0 on success
1130 static int gpio_chrdev_open(struct inode *inode, struct file *filp)
1132 struct gpio_device *gdev = container_of(inode->i_cdev,
1133 struct gpio_device, chrdev);
1135 /* Fail on open if the backing gpiochip is gone */
1138 get_device(&gdev->dev);
1139 filp->private_data = gdev;
1141 return nonseekable_open(inode, filp);
1145 * gpio_chrdev_release() - close chardev after ioctl operations
1146 * @inode: inode for this chardev
1147 * @filp: file struct for storing private data
1148 * Returns 0 on success
1150 static int gpio_chrdev_release(struct inode *inode, struct file *filp)
1152 struct gpio_device *gdev = container_of(inode->i_cdev,
1153 struct gpio_device, chrdev);
1155 put_device(&gdev->dev);
1160 static const struct file_operations gpio_fileops = {
1161 .release = gpio_chrdev_release,
1162 .open = gpio_chrdev_open,
1163 .owner = THIS_MODULE,
1164 .llseek = no_llseek,
1165 .unlocked_ioctl = gpio_ioctl,
1166 #ifdef CONFIG_COMPAT
1167 .compat_ioctl = gpio_ioctl_compat,
1171 static void gpiodevice_release(struct device *dev)
1173 struct gpio_device *gdev = dev_get_drvdata(dev);
1175 list_del(&gdev->list);
1176 ida_simple_remove(&gpio_ida, gdev->id);
1177 kfree_const(gdev->label);
1182 static int gpiochip_setup_dev(struct gpio_device *gdev)
1186 cdev_init(&gdev->chrdev, &gpio_fileops);
1187 gdev->chrdev.owner = THIS_MODULE;
1188 gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id);
1190 ret = cdev_device_add(&gdev->chrdev, &gdev->dev);
1194 chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n",
1195 MAJOR(gpio_devt), gdev->id);
1197 ret = gpiochip_sysfs_register(gdev);
1199 goto err_remove_device;
1201 /* From this point, the .release() function cleans up gpio_device */
1202 gdev->dev.release = gpiodevice_release;
1203 pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n",
1204 __func__, gdev->base, gdev->base + gdev->ngpio - 1,
1205 dev_name(&gdev->dev), gdev->chip->label ? : "generic");
1210 cdev_device_del(&gdev->chrdev, &gdev->dev);
1214 static void gpiochip_machine_hog(struct gpio_chip *chip, struct gpiod_hog *hog)
1216 struct gpio_desc *desc;
1219 desc = gpiochip_get_desc(chip, hog->chip_hwnum);
1221 pr_err("%s: unable to get GPIO desc: %ld\n",
1222 __func__, PTR_ERR(desc));
1226 if (test_bit(FLAG_IS_HOGGED, &desc->flags))
1229 rv = gpiod_hog(desc, hog->line_name, hog->lflags, hog->dflags);
1231 pr_err("%s: unable to hog GPIO line (%s:%u): %d\n",
1232 __func__, chip->label, hog->chip_hwnum, rv);
1235 static void machine_gpiochip_add(struct gpio_chip *chip)
1237 struct gpiod_hog *hog;
1239 mutex_lock(&gpio_machine_hogs_mutex);
1241 list_for_each_entry(hog, &gpio_machine_hogs, list) {
1242 if (!strcmp(chip->label, hog->chip_label))
1243 gpiochip_machine_hog(chip, hog);
1246 mutex_unlock(&gpio_machine_hogs_mutex);
1249 static void gpiochip_setup_devs(void)
1251 struct gpio_device *gdev;
1254 list_for_each_entry(gdev, &gpio_devices, list) {
1255 ret = gpiochip_setup_dev(gdev);
1257 pr_err("%s: Failed to initialize gpio device (%d)\n",
1258 dev_name(&gdev->dev), ret);
1262 int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data,
1263 struct lock_class_key *lock_key,
1264 struct lock_class_key *request_key)
1266 unsigned long flags;
1269 int base = chip->base;
1270 struct gpio_device *gdev;
1273 * First: allocate and populate the internal stat container, and
1274 * set up the struct device.
1276 gdev = kzalloc(sizeof(*gdev), GFP_KERNEL);
1279 gdev->dev.bus = &gpio_bus_type;
1281 chip->gpiodev = gdev;
1283 gdev->dev.parent = chip->parent;
1284 gdev->dev.of_node = chip->parent->of_node;
1287 #ifdef CONFIG_OF_GPIO
1288 /* If the gpiochip has an assigned OF node this takes precedence */
1290 gdev->dev.of_node = chip->of_node;
1292 chip->of_node = gdev->dev.of_node;
1295 gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL);
1300 dev_set_name(&gdev->dev, "gpiochip%d", gdev->id);
1301 device_initialize(&gdev->dev);
1302 dev_set_drvdata(&gdev->dev, gdev);
1303 if (chip->parent && chip->parent->driver)
1304 gdev->owner = chip->parent->driver->owner;
1305 else if (chip->owner)
1306 /* TODO: remove chip->owner */
1307 gdev->owner = chip->owner;
1309 gdev->owner = THIS_MODULE;
1311 gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL);
1317 if (chip->ngpio == 0) {
1318 chip_err(chip, "tried to insert a GPIO chip with zero lines\n");
1320 goto err_free_descs;
1323 if (chip->ngpio > FASTPATH_NGPIO)
1324 chip_warn(chip, "line cnt %u is greater than fast path cnt %u\n",
1325 chip->ngpio, FASTPATH_NGPIO);
1327 gdev->label = kstrdup_const(chip->label ?: "unknown", GFP_KERNEL);
1330 goto err_free_descs;
1333 gdev->ngpio = chip->ngpio;
1336 spin_lock_irqsave(&gpio_lock, flags);
1339 * TODO: this allocates a Linux GPIO number base in the global
1340 * GPIO numberspace for this chip. In the long run we want to
1341 * get *rid* of this numberspace and use only descriptors, but
1342 * it may be a pipe dream. It will not happen before we get rid
1343 * of the sysfs interface anyways.
1346 base = gpiochip_find_base(chip->ngpio);
1349 spin_unlock_irqrestore(&gpio_lock, flags);
1350 goto err_free_label;
1353 * TODO: it should not be necessary to reflect the assigned
1354 * base outside of the GPIO subsystem. Go over drivers and
1355 * see if anyone makes use of this, else drop this and assign
1362 ret = gpiodev_add_to_list(gdev);
1364 spin_unlock_irqrestore(&gpio_lock, flags);
1365 goto err_free_label;
1368 spin_unlock_irqrestore(&gpio_lock, flags);
1370 for (i = 0; i < chip->ngpio; i++)
1371 gdev->descs[i].gdev = gdev;
1373 #ifdef CONFIG_PINCTRL
1374 INIT_LIST_HEAD(&gdev->pin_ranges);
1377 ret = gpiochip_set_desc_names(chip);
1379 goto err_remove_from_list;
1381 ret = gpiochip_alloc_valid_mask(chip);
1383 goto err_remove_from_list;
1385 ret = of_gpiochip_add(chip);
1387 goto err_free_gpiochip_mask;
1389 ret = gpiochip_init_valid_mask(chip);
1391 goto err_remove_of_chip;
1393 for (i = 0; i < chip->ngpio; i++) {
1394 struct gpio_desc *desc = &gdev->descs[i];
1396 if (chip->get_direction && gpiochip_line_is_valid(chip, i)) {
1397 if (!chip->get_direction(chip, i))
1398 set_bit(FLAG_IS_OUT, &desc->flags);
1400 clear_bit(FLAG_IS_OUT, &desc->flags);
1402 if (!chip->direction_input)
1403 set_bit(FLAG_IS_OUT, &desc->flags);
1405 clear_bit(FLAG_IS_OUT, &desc->flags);
1409 acpi_gpiochip_add(chip);
1411 machine_gpiochip_add(chip);
1413 ret = gpiochip_irqchip_init_valid_mask(chip);
1415 goto err_remove_acpi_chip;
1417 ret = gpiochip_add_irqchip(chip, lock_key, request_key);
1419 goto err_remove_irqchip_mask;
1422 * By first adding the chardev, and then adding the device,
1423 * we get a device node entry in sysfs under
1424 * /sys/bus/gpio/devices/gpiochipN/dev that can be used for
1425 * coldplug of device nodes and other udev business.
1426 * We can do this only if gpiolib has been initialized.
1427 * Otherwise, defer until later.
1429 if (gpiolib_initialized) {
1430 ret = gpiochip_setup_dev(gdev);
1432 goto err_remove_irqchip;
1437 gpiochip_irqchip_remove(chip);
1438 err_remove_irqchip_mask:
1439 gpiochip_irqchip_free_valid_mask(chip);
1440 err_remove_acpi_chip:
1441 acpi_gpiochip_remove(chip);
1443 gpiochip_free_hogs(chip);
1444 of_gpiochip_remove(chip);
1445 err_free_gpiochip_mask:
1446 gpiochip_free_valid_mask(chip);
1447 err_remove_from_list:
1448 spin_lock_irqsave(&gpio_lock, flags);
1449 list_del(&gdev->list);
1450 spin_unlock_irqrestore(&gpio_lock, flags);
1452 kfree_const(gdev->label);
1456 ida_simple_remove(&gpio_ida, gdev->id);
1458 /* failures here can mean systems won't boot... */
1459 pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__,
1460 gdev->base, gdev->base + gdev->ngpio - 1,
1461 chip->label ? : "generic", ret);
1465 EXPORT_SYMBOL_GPL(gpiochip_add_data_with_key);
1468 * gpiochip_get_data() - get per-subdriver data for the chip
1472 * The per-subdriver data for the chip.
1474 void *gpiochip_get_data(struct gpio_chip *chip)
1476 return chip->gpiodev->data;
1478 EXPORT_SYMBOL_GPL(gpiochip_get_data);
1481 * gpiochip_remove() - unregister a gpio_chip
1482 * @chip: the chip to unregister
1484 * A gpio_chip with any GPIOs still requested may not be removed.
1486 void gpiochip_remove(struct gpio_chip *chip)
1488 struct gpio_device *gdev = chip->gpiodev;
1489 struct gpio_desc *desc;
1490 unsigned long flags;
1492 bool requested = false;
1494 /* FIXME: should the legacy sysfs handling be moved to gpio_device? */
1495 gpiochip_sysfs_unregister(gdev);
1496 gpiochip_free_hogs(chip);
1497 /* Numb the device, cancelling all outstanding operations */
1499 gpiochip_irqchip_remove(chip);
1500 acpi_gpiochip_remove(chip);
1501 gpiochip_remove_pin_ranges(chip);
1502 of_gpiochip_remove(chip);
1503 gpiochip_free_valid_mask(chip);
1505 * We accept no more calls into the driver from this point, so
1506 * NULL the driver data pointer
1510 spin_lock_irqsave(&gpio_lock, flags);
1511 for (i = 0; i < gdev->ngpio; i++) {
1512 desc = &gdev->descs[i];
1513 if (test_bit(FLAG_REQUESTED, &desc->flags))
1516 spin_unlock_irqrestore(&gpio_lock, flags);
1519 dev_crit(&gdev->dev,
1520 "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n");
1523 * The gpiochip side puts its use of the device to rest here:
1524 * if there are no userspace clients, the chardev and device will
1525 * be removed, else it will be dangling until the last user is
1528 cdev_device_del(&gdev->chrdev, &gdev->dev);
1529 put_device(&gdev->dev);
1531 EXPORT_SYMBOL_GPL(gpiochip_remove);
1533 static void devm_gpio_chip_release(struct device *dev, void *res)
1535 struct gpio_chip *chip = *(struct gpio_chip **)res;
1537 gpiochip_remove(chip);
1541 * devm_gpiochip_add_data() - Resource manager gpiochip_add_data()
1542 * @dev: pointer to the device that gpio_chip belongs to.
1543 * @chip: the chip to register, with chip->base initialized
1544 * @data: driver-private data associated with this chip
1546 * Context: potentially before irqs will work
1548 * The gpio chip automatically be released when the device is unbound.
1551 * A negative errno if the chip can't be registered, such as because the
1552 * chip->base is invalid or already associated with a different chip.
1553 * Otherwise it returns zero as a success code.
1555 int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip,
1558 struct gpio_chip **ptr;
1561 ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr),
1566 ret = gpiochip_add_data(chip, data);
1573 devres_add(dev, ptr);
1577 EXPORT_SYMBOL_GPL(devm_gpiochip_add_data);
1580 * gpiochip_find() - iterator for locating a specific gpio_chip
1581 * @data: data to pass to match function
1582 * @match: Callback function to check gpio_chip
1584 * Similar to bus_find_device. It returns a reference to a gpio_chip as
1585 * determined by a user supplied @match callback. The callback should return
1586 * 0 if the device doesn't match and non-zero if it does. If the callback is
1587 * non-zero, this function will return to the caller and not iterate over any
1590 struct gpio_chip *gpiochip_find(void *data,
1591 int (*match)(struct gpio_chip *chip,
1594 struct gpio_device *gdev;
1595 struct gpio_chip *chip = NULL;
1596 unsigned long flags;
1598 spin_lock_irqsave(&gpio_lock, flags);
1599 list_for_each_entry(gdev, &gpio_devices, list)
1600 if (gdev->chip && match(gdev->chip, data)) {
1605 spin_unlock_irqrestore(&gpio_lock, flags);
1609 EXPORT_SYMBOL_GPL(gpiochip_find);
1611 static int gpiochip_match_name(struct gpio_chip *chip, void *data)
1613 const char *name = data;
1615 return !strcmp(chip->label, name);
1618 static struct gpio_chip *find_chip_by_name(const char *name)
1620 return gpiochip_find((void *)name, gpiochip_match_name);
1623 #ifdef CONFIG_GPIOLIB_IRQCHIP
1626 * The following is irqchip helper code for gpiochips.
1629 static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gc)
1631 struct gpio_irq_chip *girq = &gc->irq;
1633 if (!girq->init_valid_mask)
1636 girq->valid_mask = gpiochip_allocate_mask(gc);
1637 if (!girq->valid_mask)
1640 girq->init_valid_mask(gc, girq->valid_mask, gc->ngpio);
1645 static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip)
1647 bitmap_free(gpiochip->irq.valid_mask);
1648 gpiochip->irq.valid_mask = NULL;
1651 bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip,
1652 unsigned int offset)
1654 if (!gpiochip_line_is_valid(gpiochip, offset))
1656 /* No mask means all valid */
1657 if (likely(!gpiochip->irq.valid_mask))
1659 return test_bit(offset, gpiochip->irq.valid_mask);
1661 EXPORT_SYMBOL_GPL(gpiochip_irqchip_irq_valid);
1664 * gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip
1665 * @gc: the gpiochip to set the irqchip chain to
1666 * @parent_irq: the irq number corresponding to the parent IRQ for this
1668 * @parent_handler: the parent interrupt handler for the accumulated IRQ
1669 * coming out of the gpiochip. If the interrupt is nested rather than
1670 * cascaded, pass NULL in this handler argument
1672 static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gc,
1673 unsigned int parent_irq,
1674 irq_flow_handler_t parent_handler)
1676 struct gpio_irq_chip *girq = &gc->irq;
1677 struct device *dev = &gc->gpiodev->dev;
1679 if (!girq->domain) {
1680 chip_err(gc, "called %s before setting up irqchip\n",
1685 if (parent_handler) {
1686 if (gc->can_sleep) {
1688 "you cannot have chained interrupts on a chip that may sleep\n");
1691 girq->parents = devm_kcalloc(dev, 1,
1692 sizeof(*girq->parents),
1694 if (!girq->parents) {
1695 chip_err(gc, "out of memory allocating parent IRQ\n");
1698 girq->parents[0] = parent_irq;
1699 girq->num_parents = 1;
1701 * The parent irqchip is already using the chip_data for this
1702 * irqchip, so our callbacks simply use the handler_data.
1704 irq_set_chained_handler_and_data(parent_irq, parent_handler,
1710 * gpiochip_set_chained_irqchip() - connects a chained irqchip to a gpiochip
1711 * @gpiochip: the gpiochip to set the irqchip chain to
1712 * @irqchip: the irqchip to chain to the gpiochip
1713 * @parent_irq: the irq number corresponding to the parent IRQ for this
1715 * @parent_handler: the parent interrupt handler for the accumulated IRQ
1716 * coming out of the gpiochip.
1718 void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
1719 struct irq_chip *irqchip,
1720 unsigned int parent_irq,
1721 irq_flow_handler_t parent_handler)
1723 if (gpiochip->irq.threaded) {
1724 chip_err(gpiochip, "tried to chain a threaded gpiochip\n");
1728 gpiochip_set_cascaded_irqchip(gpiochip, parent_irq, parent_handler);
1730 EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip);
1733 * gpiochip_set_nested_irqchip() - connects a nested irqchip to a gpiochip
1734 * @gpiochip: the gpiochip to set the irqchip nested handler to
1735 * @irqchip: the irqchip to nest to the gpiochip
1736 * @parent_irq: the irq number corresponding to the parent IRQ for this
1739 void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip,
1740 struct irq_chip *irqchip,
1741 unsigned int parent_irq)
1743 gpiochip_set_cascaded_irqchip(gpiochip, parent_irq, NULL);
1745 EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip);
1747 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1750 * gpiochip_set_hierarchical_irqchip() - connects a hierarchical irqchip
1752 * @gc: the gpiochip to set the irqchip hierarchical handler to
1753 * @irqchip: the irqchip to handle this level of the hierarchy, the interrupt
1754 * will then percolate up to the parent
1756 static void gpiochip_set_hierarchical_irqchip(struct gpio_chip *gc,
1757 struct irq_chip *irqchip)
1759 /* DT will deal with mapping each IRQ as we go along */
1760 if (is_of_node(gc->irq.fwnode))
1764 * This is for legacy and boardfile "irqchip" fwnodes: allocate
1765 * irqs upfront instead of dynamically since we don't have the
1766 * dynamic type of allocation that hardware description languages
1767 * provide. Once all GPIO drivers using board files are gone from
1768 * the kernel we can delete this code, but for a transitional period
1769 * it is necessary to keep this around.
1771 if (is_fwnode_irqchip(gc->irq.fwnode)) {
1775 for (i = 0; i < gc->ngpio; i++) {
1776 struct irq_fwspec fwspec;
1777 unsigned int parent_hwirq;
1778 unsigned int parent_type;
1779 struct gpio_irq_chip *girq = &gc->irq;
1782 * We call the child to parent translation function
1783 * only to check if the child IRQ is valid or not.
1784 * Just pick the rising edge type here as that is what
1785 * we likely need to support.
1787 ret = girq->child_to_parent_hwirq(gc, i,
1788 IRQ_TYPE_EDGE_RISING,
1792 chip_err(gc, "skip set-up on hwirq %d\n",
1797 fwspec.fwnode = gc->irq.fwnode;
1798 /* This is the hwirq for the GPIO line side of things */
1799 fwspec.param[0] = girq->child_offset_to_irq(gc, i);
1800 /* Just pick something */
1801 fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
1802 fwspec.param_count = 2;
1803 ret = __irq_domain_alloc_irqs(gc->irq.domain,
1804 /* just pick something */
1813 "can not allocate irq for GPIO line %d parent hwirq %d in hierarchy domain: %d\n",
1820 chip_err(gc, "%s unknown fwnode type proceed anyway\n", __func__);
1825 static int gpiochip_hierarchy_irq_domain_translate(struct irq_domain *d,
1826 struct irq_fwspec *fwspec,
1827 unsigned long *hwirq,
1830 /* We support standard DT translation */
1831 if (is_of_node(fwspec->fwnode) && fwspec->param_count == 2) {
1832 return irq_domain_translate_twocell(d, fwspec, hwirq, type);
1835 /* This is for board files and others not using DT */
1836 if (is_fwnode_irqchip(fwspec->fwnode)) {
1839 ret = irq_domain_translate_twocell(d, fwspec, hwirq, type);
1842 WARN_ON(*type == IRQ_TYPE_NONE);
1848 static int gpiochip_hierarchy_irq_domain_alloc(struct irq_domain *d,
1850 unsigned int nr_irqs,
1853 struct gpio_chip *gc = d->host_data;
1854 irq_hw_number_t hwirq;
1855 unsigned int type = IRQ_TYPE_NONE;
1856 struct irq_fwspec *fwspec = data;
1857 struct irq_fwspec parent_fwspec;
1858 unsigned int parent_hwirq;
1859 unsigned int parent_type;
1860 struct gpio_irq_chip *girq = &gc->irq;
1864 * The nr_irqs parameter is always one except for PCI multi-MSI
1865 * so this should not happen.
1867 WARN_ON(nr_irqs != 1);
1869 ret = gc->irq.child_irq_domain_ops.translate(d, fwspec, &hwirq, &type);
1873 chip_info(gc, "allocate IRQ %d, hwirq %lu\n", irq, hwirq);
1875 ret = girq->child_to_parent_hwirq(gc, hwirq, type,
1876 &parent_hwirq, &parent_type);
1878 chip_err(gc, "can't look up hwirq %lu\n", hwirq);
1881 chip_info(gc, "found parent hwirq %u\n", parent_hwirq);
1884 * We set handle_bad_irq because the .set_type() should
1885 * always be invoked and set the right type of handler.
1887 irq_domain_set_info(d,
1897 * Create a IRQ fwspec to send up to the parent irqdomain:
1898 * specify the hwirq we address on the parent and tie it
1899 * all together up the chain.
1901 parent_fwspec.fwnode = d->parent->fwnode;
1902 /* This parent only handles asserted level IRQs */
1903 girq->populate_parent_fwspec(gc, &parent_fwspec, parent_hwirq,
1905 chip_info(gc, "alloc_irqs_parent for %d parent hwirq %d\n",
1907 ret = irq_domain_alloc_irqs_parent(d, irq, 1, &parent_fwspec);
1910 "failed to allocate parent hwirq %d for hwirq %lu\n",
1911 parent_hwirq, hwirq);
1916 static unsigned int gpiochip_child_offset_to_irq_noop(struct gpio_chip *chip,
1917 unsigned int offset)
1922 static void gpiochip_hierarchy_setup_domain_ops(struct irq_domain_ops *ops)
1924 ops->activate = gpiochip_irq_domain_activate;
1925 ops->deactivate = gpiochip_irq_domain_deactivate;
1926 ops->alloc = gpiochip_hierarchy_irq_domain_alloc;
1927 ops->free = irq_domain_free_irqs_common;
1930 * We only allow overriding the translate() function for
1931 * hierarchical chips, and this should only be done if the user
1932 * really need something other than 1:1 translation.
1934 if (!ops->translate)
1935 ops->translate = gpiochip_hierarchy_irq_domain_translate;
1938 static int gpiochip_hierarchy_add_domain(struct gpio_chip *gc)
1940 if (!gc->irq.child_to_parent_hwirq ||
1942 chip_err(gc, "missing irqdomain vital data\n");
1946 if (!gc->irq.child_offset_to_irq)
1947 gc->irq.child_offset_to_irq = gpiochip_child_offset_to_irq_noop;
1949 if (!gc->irq.populate_parent_fwspec)
1950 gc->irq.populate_parent_fwspec =
1951 gpiochip_populate_parent_fwspec_twocell;
1953 gpiochip_hierarchy_setup_domain_ops(&gc->irq.child_irq_domain_ops);
1955 gc->irq.domain = irq_domain_create_hierarchy(
1956 gc->irq.parent_domain,
1960 &gc->irq.child_irq_domain_ops,
1963 if (!gc->irq.domain)
1966 gpiochip_set_hierarchical_irqchip(gc, gc->irq.chip);
1971 static bool gpiochip_hierarchy_is_hierarchical(struct gpio_chip *gc)
1973 return !!gc->irq.parent_domain;
1976 void gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *chip,
1977 struct irq_fwspec *fwspec,
1978 unsigned int parent_hwirq,
1979 unsigned int parent_type)
1981 fwspec->param_count = 2;
1982 fwspec->param[0] = parent_hwirq;
1983 fwspec->param[1] = parent_type;
1985 EXPORT_SYMBOL_GPL(gpiochip_populate_parent_fwspec_twocell);
1987 void gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *chip,
1988 struct irq_fwspec *fwspec,
1989 unsigned int parent_hwirq,
1990 unsigned int parent_type)
1992 fwspec->param_count = 4;
1993 fwspec->param[0] = 0;
1994 fwspec->param[1] = parent_hwirq;
1995 fwspec->param[2] = 0;
1996 fwspec->param[3] = parent_type;
1998 EXPORT_SYMBOL_GPL(gpiochip_populate_parent_fwspec_fourcell);
2002 static int gpiochip_hierarchy_add_domain(struct gpio_chip *gc)
2007 static bool gpiochip_hierarchy_is_hierarchical(struct gpio_chip *gc)
2012 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
2015 * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip
2016 * @d: the irqdomain used by this irqchip
2017 * @irq: the global irq number used by this GPIO irqchip irq
2018 * @hwirq: the local IRQ/GPIO line offset on this gpiochip
2020 * This function will set up the mapping for a certain IRQ line on a
2021 * gpiochip by assigning the gpiochip as chip data, and using the irqchip
2022 * stored inside the gpiochip.
2024 int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
2025 irq_hw_number_t hwirq)
2027 struct gpio_chip *chip = d->host_data;
2030 if (!gpiochip_irqchip_irq_valid(chip, hwirq))
2033 irq_set_chip_data(irq, chip);
2035 * This lock class tells lockdep that GPIO irqs are in a different
2036 * category than their parents, so it won't report false recursion.
2038 irq_set_lockdep_class(irq, chip->irq.lock_key, chip->irq.request_key);
2039 irq_set_chip_and_handler(irq, chip->irq.chip, chip->irq.handler);
2040 /* Chips that use nested thread handlers have them marked */
2041 if (chip->irq.threaded)
2042 irq_set_nested_thread(irq, 1);
2043 irq_set_noprobe(irq);
2045 if (chip->irq.num_parents == 1)
2046 ret = irq_set_parent(irq, chip->irq.parents[0]);
2047 else if (chip->irq.map)
2048 ret = irq_set_parent(irq, chip->irq.map[hwirq]);
2054 * No set-up of the hardware will happen if IRQ_TYPE_NONE
2055 * is passed as default type.
2057 if (chip->irq.default_type != IRQ_TYPE_NONE)
2058 irq_set_irq_type(irq, chip->irq.default_type);
2062 EXPORT_SYMBOL_GPL(gpiochip_irq_map);
2064 void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq)
2066 struct gpio_chip *chip = d->host_data;
2068 if (chip->irq.threaded)
2069 irq_set_nested_thread(irq, 0);
2070 irq_set_chip_and_handler(irq, NULL, NULL);
2071 irq_set_chip_data(irq, NULL);
2073 EXPORT_SYMBOL_GPL(gpiochip_irq_unmap);
2075 static const struct irq_domain_ops gpiochip_domain_ops = {
2076 .map = gpiochip_irq_map,
2077 .unmap = gpiochip_irq_unmap,
2078 /* Virtually all GPIO irqchips are twocell:ed */
2079 .xlate = irq_domain_xlate_twocell,
2083 * TODO: move these activate/deactivate in under the hierarchicial
2084 * irqchip implementation as static once SPMI and SSBI (all external
2085 * users) are phased over.
2088 * gpiochip_irq_domain_activate() - Lock a GPIO to be used as an IRQ
2089 * @domain: The IRQ domain used by this IRQ chip
2090 * @data: Outermost irq_data associated with the IRQ
2091 * @reserve: If set, only reserve an interrupt vector instead of assigning one
2093 * This function is a wrapper that calls gpiochip_lock_as_irq() and is to be
2094 * used as the activate function for the &struct irq_domain_ops. The host_data
2095 * for the IRQ domain must be the &struct gpio_chip.
2097 int gpiochip_irq_domain_activate(struct irq_domain *domain,
2098 struct irq_data *data, bool reserve)
2100 struct gpio_chip *chip = domain->host_data;
2102 return gpiochip_lock_as_irq(chip, data->hwirq);
2104 EXPORT_SYMBOL_GPL(gpiochip_irq_domain_activate);
2107 * gpiochip_irq_domain_deactivate() - Unlock a GPIO used as an IRQ
2108 * @domain: The IRQ domain used by this IRQ chip
2109 * @data: Outermost irq_data associated with the IRQ
2111 * This function is a wrapper that will call gpiochip_unlock_as_irq() and is to
2112 * be used as the deactivate function for the &struct irq_domain_ops. The
2113 * host_data for the IRQ domain must be the &struct gpio_chip.
2115 void gpiochip_irq_domain_deactivate(struct irq_domain *domain,
2116 struct irq_data *data)
2118 struct gpio_chip *chip = domain->host_data;
2120 return gpiochip_unlock_as_irq(chip, data->hwirq);
2122 EXPORT_SYMBOL_GPL(gpiochip_irq_domain_deactivate);
2124 static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset)
2126 struct irq_domain *domain = chip->irq.domain;
2128 if (!gpiochip_irqchip_irq_valid(chip, offset))
2131 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
2132 if (irq_domain_is_hierarchy(domain)) {
2133 struct irq_fwspec spec;
2135 spec.fwnode = domain->fwnode;
2136 spec.param_count = 2;
2137 spec.param[0] = chip->irq.child_offset_to_irq(chip, offset);
2138 spec.param[1] = IRQ_TYPE_NONE;
2140 return irq_create_fwspec_mapping(&spec);
2144 return irq_create_mapping(domain, offset);
2147 static int gpiochip_irq_reqres(struct irq_data *d)
2149 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
2151 return gpiochip_reqres_irq(chip, d->hwirq);
2154 static void gpiochip_irq_relres(struct irq_data *d)
2156 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
2158 gpiochip_relres_irq(chip, d->hwirq);
2161 static void gpiochip_irq_enable(struct irq_data *d)
2163 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
2165 gpiochip_enable_irq(chip, d->hwirq);
2166 if (chip->irq.irq_enable)
2167 chip->irq.irq_enable(d);
2169 chip->irq.chip->irq_unmask(d);
2172 static void gpiochip_irq_disable(struct irq_data *d)
2174 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
2176 if (chip->irq.irq_disable)
2177 chip->irq.irq_disable(d);
2179 chip->irq.chip->irq_mask(d);
2180 gpiochip_disable_irq(chip, d->hwirq);
2183 static void gpiochip_set_irq_hooks(struct gpio_chip *gpiochip)
2185 struct irq_chip *irqchip = gpiochip->irq.chip;
2187 if (!irqchip->irq_request_resources &&
2188 !irqchip->irq_release_resources) {
2189 irqchip->irq_request_resources = gpiochip_irq_reqres;
2190 irqchip->irq_release_resources = gpiochip_irq_relres;
2192 if (WARN_ON(gpiochip->irq.irq_enable))
2194 /* Check if the irqchip already has this hook... */
2195 if (irqchip->irq_enable == gpiochip_irq_enable) {
2197 * ...and if so, give a gentle warning that this is bad
2201 "detected irqchip that is shared with multiple gpiochips: please fix the driver.\n");
2204 gpiochip->irq.irq_enable = irqchip->irq_enable;
2205 gpiochip->irq.irq_disable = irqchip->irq_disable;
2206 irqchip->irq_enable = gpiochip_irq_enable;
2207 irqchip->irq_disable = gpiochip_irq_disable;
2211 * gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip
2212 * @gpiochip: the GPIO chip to add the IRQ chip to
2213 * @lock_key: lockdep class for IRQ lock
2214 * @request_key: lockdep class for IRQ request
2216 static int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
2217 struct lock_class_key *lock_key,
2218 struct lock_class_key *request_key)
2220 struct irq_chip *irqchip = gpiochip->irq.chip;
2221 const struct irq_domain_ops *ops = NULL;
2222 struct device_node *np;
2229 if (gpiochip->irq.parent_handler && gpiochip->can_sleep) {
2230 chip_err(gpiochip, "you cannot have chained interrupts on a chip that may sleep\n");
2234 np = gpiochip->gpiodev->dev.of_node;
2235 type = gpiochip->irq.default_type;
2238 * Specifying a default trigger is a terrible idea if DT or ACPI is
2239 * used to configure the interrupts, as you may end up with
2240 * conflicting triggers. Tell the user, and reset to NONE.
2242 if (WARN(np && type != IRQ_TYPE_NONE,
2243 "%s: Ignoring %u default trigger\n", np->full_name, type))
2244 type = IRQ_TYPE_NONE;
2246 if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) {
2247 acpi_handle_warn(ACPI_HANDLE(gpiochip->parent),
2248 "Ignoring %u default trigger\n", type);
2249 type = IRQ_TYPE_NONE;
2252 gpiochip->to_irq = gpiochip_to_irq;
2253 gpiochip->irq.default_type = type;
2254 gpiochip->irq.lock_key = lock_key;
2255 gpiochip->irq.request_key = request_key;
2257 /* If a parent irqdomain is provided, let's build a hierarchy */
2258 if (gpiochip_hierarchy_is_hierarchical(gpiochip)) {
2259 int ret = gpiochip_hierarchy_add_domain(gpiochip);
2263 /* Some drivers provide custom irqdomain ops */
2264 if (gpiochip->irq.domain_ops)
2265 ops = gpiochip->irq.domain_ops;
2268 ops = &gpiochip_domain_ops;
2269 gpiochip->irq.domain = irq_domain_add_simple(np,
2271 gpiochip->irq.first,
2273 if (!gpiochip->irq.domain)
2277 if (gpiochip->irq.parent_handler) {
2278 void *data = gpiochip->irq.parent_handler_data ?: gpiochip;
2280 for (i = 0; i < gpiochip->irq.num_parents; i++) {
2282 * The parent IRQ chip is already using the chip_data
2283 * for this IRQ chip, so our callbacks simply use the
2286 irq_set_chained_handler_and_data(gpiochip->irq.parents[i],
2287 gpiochip->irq.parent_handler,
2292 gpiochip_set_irq_hooks(gpiochip);
2294 acpi_gpiochip_request_interrupts(gpiochip);
2300 * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip
2301 * @gpiochip: the gpiochip to remove the irqchip from
2303 * This is called only from gpiochip_remove()
2305 static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
2307 struct irq_chip *irqchip = gpiochip->irq.chip;
2308 unsigned int offset;
2310 acpi_gpiochip_free_interrupts(gpiochip);
2312 if (irqchip && gpiochip->irq.parent_handler) {
2313 struct gpio_irq_chip *irq = &gpiochip->irq;
2316 for (i = 0; i < irq->num_parents; i++)
2317 irq_set_chained_handler_and_data(irq->parents[i],
2321 /* Remove all IRQ mappings and delete the domain */
2322 if (gpiochip->irq.domain) {
2325 for (offset = 0; offset < gpiochip->ngpio; offset++) {
2326 if (!gpiochip_irqchip_irq_valid(gpiochip, offset))
2329 irq = irq_find_mapping(gpiochip->irq.domain, offset);
2330 irq_dispose_mapping(irq);
2333 irq_domain_remove(gpiochip->irq.domain);
2337 if (irqchip->irq_request_resources == gpiochip_irq_reqres) {
2338 irqchip->irq_request_resources = NULL;
2339 irqchip->irq_release_resources = NULL;
2341 if (irqchip->irq_enable == gpiochip_irq_enable) {
2342 irqchip->irq_enable = gpiochip->irq.irq_enable;
2343 irqchip->irq_disable = gpiochip->irq.irq_disable;
2346 gpiochip->irq.irq_enable = NULL;
2347 gpiochip->irq.irq_disable = NULL;
2348 gpiochip->irq.chip = NULL;
2350 gpiochip_irqchip_free_valid_mask(gpiochip);
2354 * gpiochip_irqchip_add_key() - adds an irqchip to a gpiochip
2355 * @gpiochip: the gpiochip to add the irqchip to
2356 * @irqchip: the irqchip to add to the gpiochip
2357 * @first_irq: if not dynamically assigned, the base (first) IRQ to
2358 * allocate gpiochip irqs from
2359 * @handler: the irq handler to use (often a predefined irq core function)
2360 * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE
2361 * to have the core avoid setting up any default type in the hardware.
2362 * @threaded: whether this irqchip uses a nested thread handler
2363 * @lock_key: lockdep class for IRQ lock
2364 * @request_key: lockdep class for IRQ request
2366 * This function closely associates a certain irqchip with a certain
2367 * gpiochip, providing an irq domain to translate the local IRQs to
2368 * global irqs in the gpiolib core, and making sure that the gpiochip
2369 * is passed as chip data to all related functions. Driver callbacks
2370 * need to use gpiochip_get_data() to get their local state containers back
2371 * from the gpiochip passed as chip data. An irqdomain will be stored
2372 * in the gpiochip that shall be used by the driver to handle IRQ number
2373 * translation. The gpiochip will need to be initialized and registered
2374 * before calling this function.
2376 * This function will handle two cell:ed simple IRQs and assumes all
2377 * the pins on the gpiochip can generate a unique IRQ. Everything else
2378 * need to be open coded.
2380 int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip,
2381 struct irq_chip *irqchip,
2382 unsigned int first_irq,
2383 irq_flow_handler_t handler,
2386 struct lock_class_key *lock_key,
2387 struct lock_class_key *request_key)
2389 struct device_node *of_node;
2391 if (!gpiochip || !irqchip)
2394 if (!gpiochip->parent) {
2395 pr_err("missing gpiochip .dev parent pointer\n");
2398 gpiochip->irq.threaded = threaded;
2399 of_node = gpiochip->parent->of_node;
2400 #ifdef CONFIG_OF_GPIO
2402 * If the gpiochip has an assigned OF node this takes precedence
2403 * FIXME: get rid of this and use gpiochip->parent->of_node
2406 if (gpiochip->of_node)
2407 of_node = gpiochip->of_node;
2410 * Specifying a default trigger is a terrible idea if DT or ACPI is
2411 * used to configure the interrupts, as you may end-up with
2412 * conflicting triggers. Tell the user, and reset to NONE.
2414 if (WARN(of_node && type != IRQ_TYPE_NONE,
2415 "%pOF: Ignoring %d default trigger\n", of_node, type))
2416 type = IRQ_TYPE_NONE;
2417 if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) {
2418 acpi_handle_warn(ACPI_HANDLE(gpiochip->parent),
2419 "Ignoring %d default trigger\n", type);
2420 type = IRQ_TYPE_NONE;
2423 gpiochip->irq.chip = irqchip;
2424 gpiochip->irq.handler = handler;
2425 gpiochip->irq.default_type = type;
2426 gpiochip->to_irq = gpiochip_to_irq;
2427 gpiochip->irq.lock_key = lock_key;
2428 gpiochip->irq.request_key = request_key;
2429 gpiochip->irq.domain = irq_domain_add_simple(of_node,
2430 gpiochip->ngpio, first_irq,
2431 &gpiochip_domain_ops, gpiochip);
2432 if (!gpiochip->irq.domain) {
2433 gpiochip->irq.chip = NULL;
2437 gpiochip_set_irq_hooks(gpiochip);
2439 acpi_gpiochip_request_interrupts(gpiochip);
2443 EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key);
2445 #else /* CONFIG_GPIOLIB_IRQCHIP */
2447 static inline int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
2448 struct lock_class_key *lock_key,
2449 struct lock_class_key *request_key)
2454 static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {}
2455 static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip)
2459 static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip)
2462 #endif /* CONFIG_GPIOLIB_IRQCHIP */
2465 * gpiochip_generic_request() - request the gpio function for a pin
2466 * @chip: the gpiochip owning the GPIO
2467 * @offset: the offset of the GPIO to request for GPIO function
2469 int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset)
2471 return pinctrl_gpio_request(chip->gpiodev->base + offset);
2473 EXPORT_SYMBOL_GPL(gpiochip_generic_request);
2476 * gpiochip_generic_free() - free the gpio function from a pin
2477 * @chip: the gpiochip to request the gpio function for
2478 * @offset: the offset of the GPIO to free from GPIO function
2480 void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset)
2482 pinctrl_gpio_free(chip->gpiodev->base + offset);
2484 EXPORT_SYMBOL_GPL(gpiochip_generic_free);
2487 * gpiochip_generic_config() - apply configuration for a pin
2488 * @chip: the gpiochip owning the GPIO
2489 * @offset: the offset of the GPIO to apply the configuration
2490 * @config: the configuration to be applied
2492 int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset,
2493 unsigned long config)
2495 return pinctrl_gpio_set_config(chip->gpiodev->base + offset, config);
2497 EXPORT_SYMBOL_GPL(gpiochip_generic_config);
2499 #ifdef CONFIG_PINCTRL
2502 * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping
2503 * @chip: the gpiochip to add the range for
2504 * @pctldev: the pin controller to map to
2505 * @gpio_offset: the start offset in the current gpio_chip number space
2506 * @pin_group: name of the pin group inside the pin controller
2508 * Calling this function directly from a DeviceTree-supported
2509 * pinctrl driver is DEPRECATED. Please see Section 2.1 of
2510 * Documentation/devicetree/bindings/gpio/gpio.txt on how to
2511 * bind pinctrl and gpio drivers via the "gpio-ranges" property.
2513 int gpiochip_add_pingroup_range(struct gpio_chip *chip,
2514 struct pinctrl_dev *pctldev,
2515 unsigned int gpio_offset, const char *pin_group)
2517 struct gpio_pin_range *pin_range;
2518 struct gpio_device *gdev = chip->gpiodev;
2521 pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
2523 chip_err(chip, "failed to allocate pin ranges\n");
2527 /* Use local offset as range ID */
2528 pin_range->range.id = gpio_offset;
2529 pin_range->range.gc = chip;
2530 pin_range->range.name = chip->label;
2531 pin_range->range.base = gdev->base + gpio_offset;
2532 pin_range->pctldev = pctldev;
2534 ret = pinctrl_get_group_pins(pctldev, pin_group,
2535 &pin_range->range.pins,
2536 &pin_range->range.npins);
2542 pinctrl_add_gpio_range(pctldev, &pin_range->range);
2544 chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n",
2545 gpio_offset, gpio_offset + pin_range->range.npins - 1,
2546 pinctrl_dev_get_devname(pctldev), pin_group);
2548 list_add_tail(&pin_range->node, &gdev->pin_ranges);
2552 EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range);
2555 * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping
2556 * @chip: the gpiochip to add the range for
2557 * @pinctl_name: the dev_name() of the pin controller to map to
2558 * @gpio_offset: the start offset in the current gpio_chip number space
2559 * @pin_offset: the start offset in the pin controller number space
2560 * @npins: the number of pins from the offset of each pin space (GPIO and
2561 * pin controller) to accumulate in this range
2564 * 0 on success, or a negative error-code on failure.
2566 * Calling this function directly from a DeviceTree-supported
2567 * pinctrl driver is DEPRECATED. Please see Section 2.1 of
2568 * Documentation/devicetree/bindings/gpio/gpio.txt on how to
2569 * bind pinctrl and gpio drivers via the "gpio-ranges" property.
2571 int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
2572 unsigned int gpio_offset, unsigned int pin_offset,
2575 struct gpio_pin_range *pin_range;
2576 struct gpio_device *gdev = chip->gpiodev;
2579 pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
2581 chip_err(chip, "failed to allocate pin ranges\n");
2585 /* Use local offset as range ID */
2586 pin_range->range.id = gpio_offset;
2587 pin_range->range.gc = chip;
2588 pin_range->range.name = chip->label;
2589 pin_range->range.base = gdev->base + gpio_offset;
2590 pin_range->range.pin_base = pin_offset;
2591 pin_range->range.npins = npins;
2592 pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name,
2594 if (IS_ERR(pin_range->pctldev)) {
2595 ret = PTR_ERR(pin_range->pctldev);
2596 chip_err(chip, "could not create pin range\n");
2600 chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n",
2601 gpio_offset, gpio_offset + npins - 1,
2603 pin_offset, pin_offset + npins - 1);
2605 list_add_tail(&pin_range->node, &gdev->pin_ranges);
2609 EXPORT_SYMBOL_GPL(gpiochip_add_pin_range);
2612 * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings
2613 * @chip: the chip to remove all the mappings for
2615 void gpiochip_remove_pin_ranges(struct gpio_chip *chip)
2617 struct gpio_pin_range *pin_range, *tmp;
2618 struct gpio_device *gdev = chip->gpiodev;
2620 list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) {
2621 list_del(&pin_range->node);
2622 pinctrl_remove_gpio_range(pin_range->pctldev,
2627 EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges);
2629 #endif /* CONFIG_PINCTRL */
2631 /* These "optional" allocation calls help prevent drivers from stomping
2632 * on each other, and help provide better diagnostics in debugfs.
2633 * They're called even less than the "set direction" calls.
2635 static int gpiod_request_commit(struct gpio_desc *desc, const char *label)
2637 struct gpio_chip *chip = desc->gdev->chip;
2639 unsigned long flags;
2643 label = kstrdup_const(label, GFP_KERNEL);
2648 spin_lock_irqsave(&gpio_lock, flags);
2650 /* NOTE: gpio_request() can be called in early boot,
2651 * before IRQs are enabled, for non-sleeping (SOC) GPIOs.
2654 if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) {
2655 desc_set_label(desc, label ? : "?");
2663 if (chip->request) {
2664 /* chip->request may sleep */
2665 spin_unlock_irqrestore(&gpio_lock, flags);
2666 offset = gpio_chip_hwgpio(desc);
2667 if (gpiochip_line_is_valid(chip, offset))
2668 ret = chip->request(chip, offset);
2671 spin_lock_irqsave(&gpio_lock, flags);
2674 desc_set_label(desc, NULL);
2676 clear_bit(FLAG_REQUESTED, &desc->flags);
2680 if (chip->get_direction) {
2681 /* chip->get_direction may sleep */
2682 spin_unlock_irqrestore(&gpio_lock, flags);
2683 gpiod_get_direction(desc);
2684 spin_lock_irqsave(&gpio_lock, flags);
2687 spin_unlock_irqrestore(&gpio_lock, flags);
2692 * This descriptor validation needs to be inserted verbatim into each
2693 * function taking a descriptor, so we need to use a preprocessor
2694 * macro to avoid endless duplication. If the desc is NULL it is an
2695 * optional GPIO and calls should just bail out.
2697 static int validate_desc(const struct gpio_desc *desc, const char *func)
2702 pr_warn("%s: invalid GPIO (errorpointer)\n", func);
2703 return PTR_ERR(desc);
2706 pr_warn("%s: invalid GPIO (no device)\n", func);
2709 if (!desc->gdev->chip) {
2710 dev_warn(&desc->gdev->dev,
2711 "%s: backing chip is gone\n", func);
2717 #define VALIDATE_DESC(desc) do { \
2718 int __valid = validate_desc(desc, __func__); \
2723 #define VALIDATE_DESC_VOID(desc) do { \
2724 int __valid = validate_desc(desc, __func__); \
2729 int gpiod_request(struct gpio_desc *desc, const char *label)
2731 int ret = -EPROBE_DEFER;
2732 struct gpio_device *gdev;
2734 VALIDATE_DESC(desc);
2737 if (try_module_get(gdev->owner)) {
2738 ret = gpiod_request_commit(desc, label);
2740 module_put(gdev->owner);
2742 get_device(&gdev->dev);
2746 gpiod_dbg(desc, "%s: status %d\n", __func__, ret);
2751 static bool gpiod_free_commit(struct gpio_desc *desc)
2754 unsigned long flags;
2755 struct gpio_chip *chip;
2759 gpiod_unexport(desc);
2761 spin_lock_irqsave(&gpio_lock, flags);
2763 chip = desc->gdev->chip;
2764 if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) {
2766 spin_unlock_irqrestore(&gpio_lock, flags);
2767 might_sleep_if(chip->can_sleep);
2768 chip->free(chip, gpio_chip_hwgpio(desc));
2769 spin_lock_irqsave(&gpio_lock, flags);
2771 kfree_const(desc->label);
2772 desc_set_label(desc, NULL);
2773 clear_bit(FLAG_ACTIVE_LOW, &desc->flags);
2774 clear_bit(FLAG_REQUESTED, &desc->flags);
2775 clear_bit(FLAG_OPEN_DRAIN, &desc->flags);
2776 clear_bit(FLAG_OPEN_SOURCE, &desc->flags);
2777 clear_bit(FLAG_PULL_UP, &desc->flags);
2778 clear_bit(FLAG_PULL_DOWN, &desc->flags);
2779 clear_bit(FLAG_IS_HOGGED, &desc->flags);
2783 spin_unlock_irqrestore(&gpio_lock, flags);
2787 void gpiod_free(struct gpio_desc *desc)
2789 if (desc && desc->gdev && gpiod_free_commit(desc)) {
2790 module_put(desc->gdev->owner);
2791 put_device(&desc->gdev->dev);
2793 WARN_ON(extra_checks);
2798 * gpiochip_is_requested - return string iff signal was requested
2799 * @chip: controller managing the signal
2800 * @offset: of signal within controller's 0..(ngpio - 1) range
2802 * Returns NULL if the GPIO is not currently requested, else a string.
2803 * The string returned is the label passed to gpio_request(); if none has been
2804 * passed it is a meaningless, non-NULL constant.
2806 * This function is for use by GPIO controller drivers. The label can
2807 * help with diagnostics, and knowing that the signal is used as a GPIO
2808 * can help avoid accidentally multiplexing it to another controller.
2810 const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset)
2812 struct gpio_desc *desc;
2814 if (offset >= chip->ngpio)
2817 desc = &chip->gpiodev->descs[offset];
2819 if (test_bit(FLAG_REQUESTED, &desc->flags) == 0)
2823 EXPORT_SYMBOL_GPL(gpiochip_is_requested);
2826 * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor
2828 * @hwnum: hardware number of the GPIO for which to request the descriptor
2829 * @label: label for the GPIO
2830 * @lflags: lookup flags for this GPIO or 0 if default, this can be used to
2831 * specify things like line inversion semantics with the machine flags
2832 * such as GPIO_OUT_LOW
2833 * @dflags: descriptor request flags for this GPIO or 0 if default, this
2834 * can be used to specify consumer semantics such as open drain
2836 * Function allows GPIO chip drivers to request and use their own GPIO
2837 * descriptors via gpiolib API. Difference to gpiod_request() is that this
2838 * function will not increase reference count of the GPIO chip module. This
2839 * allows the GPIO chip module to be unloaded as needed (we assume that the
2840 * GPIO chip driver handles freeing the GPIOs it has requested).
2843 * A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error
2846 struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
2848 enum gpio_lookup_flags lflags,
2849 enum gpiod_flags dflags)
2851 struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum);
2855 chip_err(chip, "failed to get GPIO descriptor\n");
2859 ret = gpiod_request_commit(desc, label);
2861 return ERR_PTR(ret);
2863 ret = gpiod_configure_flags(desc, label, lflags, dflags);
2865 chip_err(chip, "setup of own GPIO %s failed\n", label);
2866 gpiod_free_commit(desc);
2867 return ERR_PTR(ret);
2872 EXPORT_SYMBOL_GPL(gpiochip_request_own_desc);
2875 * gpiochip_free_own_desc - Free GPIO requested by the chip driver
2876 * @desc: GPIO descriptor to free
2878 * Function frees the given GPIO requested previously with
2879 * gpiochip_request_own_desc().
2881 void gpiochip_free_own_desc(struct gpio_desc *desc)
2884 gpiod_free_commit(desc);
2886 EXPORT_SYMBOL_GPL(gpiochip_free_own_desc);
2889 * Drivers MUST set GPIO direction before making get/set calls. In
2890 * some cases this is done in early boot, before IRQs are enabled.
2892 * As a rule these aren't called more than once (except for drivers
2893 * using the open-drain emulation idiom) so these are natural places
2894 * to accumulate extra debugging checks. Note that we can't (yet)
2895 * rely on gpio_request() having been called beforehand.
2898 static int gpio_set_config(struct gpio_chip *gc, unsigned offset,
2899 enum pin_config_param mode)
2901 unsigned long config;
2905 case PIN_CONFIG_BIAS_PULL_DOWN:
2906 case PIN_CONFIG_BIAS_PULL_UP:
2914 config = PIN_CONF_PACKED(mode, arg);
2915 return gc->set_config ? gc->set_config(gc, offset, config) : -ENOTSUPP;
2919 * gpiod_direction_input - set the GPIO direction to input
2920 * @desc: GPIO to set to input
2922 * Set the direction of the passed GPIO to input, such as gpiod_get_value() can
2923 * be called safely on it.
2925 * Return 0 in case of success, else an error code.
2927 int gpiod_direction_input(struct gpio_desc *desc)
2929 struct gpio_chip *chip;
2932 VALIDATE_DESC(desc);
2933 chip = desc->gdev->chip;
2936 * It is legal to have no .get() and .direction_input() specified if
2937 * the chip is output-only, but you can't specify .direction_input()
2938 * and not support the .get() operation, that doesn't make sense.
2940 if (!chip->get && chip->direction_input) {
2942 "%s: missing get() but have direction_input()\n",
2948 * If we have a .direction_input() callback, things are simple,
2949 * just call it. Else we are some input-only chip so try to check the
2950 * direction (if .get_direction() is supported) else we silently
2951 * assume we are in input mode after this.
2953 if (chip->direction_input) {
2954 ret = chip->direction_input(chip, gpio_chip_hwgpio(desc));
2955 } else if (chip->get_direction &&
2956 (chip->get_direction(chip, gpio_chip_hwgpio(desc)) != 1)) {
2958 "%s: missing direction_input() operation and line is output\n",
2963 clear_bit(FLAG_IS_OUT, &desc->flags);
2965 if (test_bit(FLAG_PULL_UP, &desc->flags))
2966 gpio_set_config(chip, gpio_chip_hwgpio(desc),
2967 PIN_CONFIG_BIAS_PULL_UP);
2968 else if (test_bit(FLAG_PULL_DOWN, &desc->flags))
2969 gpio_set_config(chip, gpio_chip_hwgpio(desc),
2970 PIN_CONFIG_BIAS_PULL_DOWN);
2972 trace_gpio_direction(desc_to_gpio(desc), 1, ret);
2976 EXPORT_SYMBOL_GPL(gpiod_direction_input);
2978 static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value)
2980 struct gpio_chip *gc = desc->gdev->chip;
2985 * It's OK not to specify .direction_output() if the gpiochip is
2986 * output-only, but if there is then not even a .set() operation it
2987 * is pretty tricky to drive the output line.
2989 if (!gc->set && !gc->direction_output) {
2991 "%s: missing set() and direction_output() operations\n",
2996 if (gc->direction_output) {
2997 ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), val);
2999 /* Check that we are in output mode if we can */
3000 if (gc->get_direction &&
3001 gc->get_direction(gc, gpio_chip_hwgpio(desc))) {
3003 "%s: missing direction_output() operation\n",
3008 * If we can't actively set the direction, we are some
3009 * output-only chip, so just drive the output as desired.
3011 gc->set(gc, gpio_chip_hwgpio(desc), val);
3015 set_bit(FLAG_IS_OUT, &desc->flags);
3016 trace_gpio_value(desc_to_gpio(desc), 0, val);
3017 trace_gpio_direction(desc_to_gpio(desc), 0, ret);
3022 * gpiod_direction_output_raw - set the GPIO direction to output
3023 * @desc: GPIO to set to output
3024 * @value: initial output value of the GPIO
3026 * Set the direction of the passed GPIO to output, such as gpiod_set_value() can
3027 * be called safely on it. The initial value of the output must be specified
3028 * as raw value on the physical line without regard for the ACTIVE_LOW status.
3030 * Return 0 in case of success, else an error code.
3032 int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
3034 VALIDATE_DESC(desc);
3035 return gpiod_direction_output_raw_commit(desc, value);
3037 EXPORT_SYMBOL_GPL(gpiod_direction_output_raw);
3040 * gpiod_direction_output - set the GPIO direction to output
3041 * @desc: GPIO to set to output
3042 * @value: initial output value of the GPIO
3044 * Set the direction of the passed GPIO to output, such as gpiod_set_value() can
3045 * be called safely on it. The initial value of the output must be specified
3046 * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
3049 * Return 0 in case of success, else an error code.
3051 int gpiod_direction_output(struct gpio_desc *desc, int value)
3053 struct gpio_chip *gc;
3056 VALIDATE_DESC(desc);
3057 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
3062 /* GPIOs used for enabled IRQs shall not be set as output */
3063 if (test_bit(FLAG_USED_AS_IRQ, &desc->flags) &&
3064 test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) {
3066 "%s: tried to set a GPIO tied to an IRQ as output\n",
3071 gc = desc->gdev->chip;
3072 if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
3073 /* First see if we can enable open drain in hardware */
3074 ret = gpio_set_config(gc, gpio_chip_hwgpio(desc),
3075 PIN_CONFIG_DRIVE_OPEN_DRAIN);
3077 goto set_output_value;
3078 /* Emulate open drain by not actively driving the line high */
3080 return gpiod_direction_input(desc);
3082 else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) {
3083 ret = gpio_set_config(gc, gpio_chip_hwgpio(desc),
3084 PIN_CONFIG_DRIVE_OPEN_SOURCE);
3086 goto set_output_value;
3087 /* Emulate open source by not actively driving the line low */
3089 return gpiod_direction_input(desc);
3091 gpio_set_config(gc, gpio_chip_hwgpio(desc),
3092 PIN_CONFIG_DRIVE_PUSH_PULL);
3096 return gpiod_direction_output_raw_commit(desc, value);
3098 EXPORT_SYMBOL_GPL(gpiod_direction_output);
3101 * gpiod_set_debounce - sets @debounce time for a GPIO
3102 * @desc: descriptor of the GPIO for which to set debounce time
3103 * @debounce: debounce time in microseconds
3106 * 0 on success, %-ENOTSUPP if the controller doesn't support setting the
3109 int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
3111 struct gpio_chip *chip;
3112 unsigned long config;
3114 VALIDATE_DESC(desc);
3115 chip = desc->gdev->chip;
3116 if (!chip->set || !chip->set_config) {
3118 "%s: missing set() or set_config() operations\n",
3123 config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce);
3124 return chip->set_config(chip, gpio_chip_hwgpio(desc), config);
3126 EXPORT_SYMBOL_GPL(gpiod_set_debounce);
3129 * gpiod_set_transitory - Lose or retain GPIO state on suspend or reset
3130 * @desc: descriptor of the GPIO for which to configure persistence
3131 * @transitory: True to lose state on suspend or reset, false for persistence
3134 * 0 on success, otherwise a negative error code.
3136 int gpiod_set_transitory(struct gpio_desc *desc, bool transitory)
3138 struct gpio_chip *chip;
3139 unsigned long packed;
3143 VALIDATE_DESC(desc);
3145 * Handle FLAG_TRANSITORY first, enabling queries to gpiolib for
3146 * persistence state.
3149 set_bit(FLAG_TRANSITORY, &desc->flags);
3151 clear_bit(FLAG_TRANSITORY, &desc->flags);
3153 /* If the driver supports it, set the persistence state now */
3154 chip = desc->gdev->chip;
3155 if (!chip->set_config)
3158 packed = pinconf_to_config_packed(PIN_CONFIG_PERSIST_STATE,
3160 gpio = gpio_chip_hwgpio(desc);
3161 rc = chip->set_config(chip, gpio, packed);
3162 if (rc == -ENOTSUPP) {
3163 dev_dbg(&desc->gdev->dev, "Persistence not supported for GPIO %d\n",
3170 EXPORT_SYMBOL_GPL(gpiod_set_transitory);
3173 * gpiod_is_active_low - test whether a GPIO is active-low or not
3174 * @desc: the gpio descriptor to test
3176 * Returns 1 if the GPIO is active-low, 0 otherwise.
3178 int gpiod_is_active_low(const struct gpio_desc *desc)
3180 VALIDATE_DESC(desc);
3181 return test_bit(FLAG_ACTIVE_LOW, &desc->flags);
3183 EXPORT_SYMBOL_GPL(gpiod_is_active_low);
3185 /* I/O calls are only valid after configuration completed; the relevant
3186 * "is this a valid GPIO" error checks should already have been done.
3188 * "Get" operations are often inlinable as reading a pin value register,
3189 * and masking the relevant bit in that register.
3191 * When "set" operations are inlinable, they involve writing that mask to
3192 * one register to set a low value, or a different register to set it high.
3193 * Otherwise locking is needed, so there may be little value to inlining.
3195 *------------------------------------------------------------------------
3197 * IMPORTANT!!! The hot paths -- get/set value -- assume that callers
3198 * have requested the GPIO. That can include implicit requesting by
3199 * a direction setting call. Marking a gpio as requested locks its chip
3200 * in memory, guaranteeing that these table lookups need no more locking
3201 * and that gpiochip_remove() will fail.
3203 * REVISIT when debugging, consider adding some instrumentation to ensure
3204 * that the GPIO was actually requested.
3207 static int gpiod_get_raw_value_commit(const struct gpio_desc *desc)
3209 struct gpio_chip *chip;
3213 chip = desc->gdev->chip;
3214 offset = gpio_chip_hwgpio(desc);
3215 value = chip->get ? chip->get(chip, offset) : -EIO;
3216 value = value < 0 ? value : !!value;
3217 trace_gpio_value(desc_to_gpio(desc), 1, value);
3221 static int gpio_chip_get_multiple(struct gpio_chip *chip,
3222 unsigned long *mask, unsigned long *bits)
3224 if (chip->get_multiple) {
3225 return chip->get_multiple(chip, mask, bits);
3226 } else if (chip->get) {
3229 for_each_set_bit(i, mask, chip->ngpio) {
3230 value = chip->get(chip, i);
3233 __assign_bit(i, bits, value);
3240 int gpiod_get_array_value_complex(bool raw, bool can_sleep,
3241 unsigned int array_size,
3242 struct gpio_desc **desc_array,
3243 struct gpio_array *array_info,
3244 unsigned long *value_bitmap)
3249 * Validate array_info against desc_array and its size.
3250 * It should immediately follow desc_array if both
3251 * have been obtained from the same gpiod_get_array() call.
3253 if (array_info && array_info->desc == desc_array &&
3254 array_size <= array_info->size &&
3255 (void *)array_info == desc_array + array_info->size) {
3257 WARN_ON(array_info->chip->can_sleep);
3259 ret = gpio_chip_get_multiple(array_info->chip,
3260 array_info->get_mask,
3265 if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
3266 bitmap_xor(value_bitmap, value_bitmap,
3267 array_info->invert_mask, array_size);
3269 if (bitmap_full(array_info->get_mask, array_size))
3272 i = find_first_zero_bit(array_info->get_mask, array_size);
3277 while (i < array_size) {
3278 struct gpio_chip *chip = desc_array[i]->gdev->chip;
3279 unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
3280 unsigned long *mask, *bits;
3283 if (likely(chip->ngpio <= FASTPATH_NGPIO)) {
3286 mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio),
3288 can_sleep ? GFP_KERNEL : GFP_ATOMIC);
3293 bits = mask + BITS_TO_LONGS(chip->ngpio);
3294 bitmap_zero(mask, chip->ngpio);
3297 WARN_ON(chip->can_sleep);
3299 /* collect all inputs belonging to the same chip */
3302 const struct gpio_desc *desc = desc_array[i];
3303 int hwgpio = gpio_chip_hwgpio(desc);
3305 __set_bit(hwgpio, mask);
3309 i = find_next_zero_bit(array_info->get_mask,
3311 } while ((i < array_size) &&
3312 (desc_array[i]->gdev->chip == chip));
3314 ret = gpio_chip_get_multiple(chip, mask, bits);
3316 if (mask != fastpath)
3321 for (j = first; j < i; ) {
3322 const struct gpio_desc *desc = desc_array[j];
3323 int hwgpio = gpio_chip_hwgpio(desc);
3324 int value = test_bit(hwgpio, bits);
3326 if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
3328 __assign_bit(j, value_bitmap, value);
3329 trace_gpio_value(desc_to_gpio(desc), 1, value);
3333 j = find_next_zero_bit(array_info->get_mask, i,
3337 if (mask != fastpath)
3344 * gpiod_get_raw_value() - return a gpio's raw value
3345 * @desc: gpio whose value will be returned
3347 * Return the GPIO's raw value, i.e. the value of the physical line disregarding
3348 * its ACTIVE_LOW status, or negative errno on failure.
3350 * This function can be called from contexts where we cannot sleep, and will
3351 * complain if the GPIO chip functions potentially sleep.
3353 int gpiod_get_raw_value(const struct gpio_desc *desc)
3355 VALIDATE_DESC(desc);
3356 /* Should be using gpiod_get_raw_value_cansleep() */
3357 WARN_ON(desc->gdev->chip->can_sleep);
3358 return gpiod_get_raw_value_commit(desc);
3360 EXPORT_SYMBOL_GPL(gpiod_get_raw_value);
3363 * gpiod_get_value() - return a gpio's value
3364 * @desc: gpio whose value will be returned
3366 * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into
3367 * account, or negative errno on failure.
3369 * This function can be called from contexts where we cannot sleep, and will
3370 * complain if the GPIO chip functions potentially sleep.
3372 int gpiod_get_value(const struct gpio_desc *desc)
3376 VALIDATE_DESC(desc);
3377 /* Should be using gpiod_get_value_cansleep() */
3378 WARN_ON(desc->gdev->chip->can_sleep);
3380 value = gpiod_get_raw_value_commit(desc);
3384 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
3389 EXPORT_SYMBOL_GPL(gpiod_get_value);
3392 * gpiod_get_raw_array_value() - read raw values from an array of GPIOs
3393 * @array_size: number of elements in the descriptor array / value bitmap
3394 * @desc_array: array of GPIO descriptors whose values will be read
3395 * @array_info: information on applicability of fast bitmap processing path
3396 * @value_bitmap: bitmap to store the read values
3398 * Read the raw values of the GPIOs, i.e. the values of the physical lines
3399 * without regard for their ACTIVE_LOW status. Return 0 in case of success,
3400 * else an error code.
3402 * This function can be called from contexts where we cannot sleep,
3403 * and it will complain if the GPIO chip functions potentially sleep.
3405 int gpiod_get_raw_array_value(unsigned int array_size,
3406 struct gpio_desc **desc_array,
3407 struct gpio_array *array_info,
3408 unsigned long *value_bitmap)
3412 return gpiod_get_array_value_complex(true, false, array_size,
3413 desc_array, array_info,
3416 EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
3419 * gpiod_get_array_value() - read values from an array of GPIOs
3420 * @array_size: number of elements in the descriptor array / value bitmap
3421 * @desc_array: array of GPIO descriptors whose values will be read
3422 * @array_info: information on applicability of fast bitmap processing path
3423 * @value_bitmap: bitmap to store the read values
3425 * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
3426 * into account. Return 0 in case of success, else an error code.
3428 * This function can be called from contexts where we cannot sleep,
3429 * and it will complain if the GPIO chip functions potentially sleep.
3431 int gpiod_get_array_value(unsigned int array_size,
3432 struct gpio_desc **desc_array,
3433 struct gpio_array *array_info,
3434 unsigned long *value_bitmap)
3438 return gpiod_get_array_value_complex(false, false, array_size,
3439 desc_array, array_info,
3442 EXPORT_SYMBOL_GPL(gpiod_get_array_value);
3445 * gpio_set_open_drain_value_commit() - Set the open drain gpio's value.
3446 * @desc: gpio descriptor whose state need to be set.
3447 * @value: Non-zero for setting it HIGH otherwise it will set to LOW.
3449 static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value)
3452 struct gpio_chip *chip = desc->gdev->chip;
3453 int offset = gpio_chip_hwgpio(desc);
3456 ret = chip->direction_input(chip, offset);
3458 clear_bit(FLAG_IS_OUT, &desc->flags);
3460 ret = chip->direction_output(chip, offset, 0);
3462 set_bit(FLAG_IS_OUT, &desc->flags);
3464 trace_gpio_direction(desc_to_gpio(desc), value, ret);
3467 "%s: Error in set_value for open drain err %d\n",
3472 * _gpio_set_open_source_value() - Set the open source gpio's value.
3473 * @desc: gpio descriptor whose state need to be set.
3474 * @value: Non-zero for setting it HIGH otherwise it will set to LOW.
3476 static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value)
3479 struct gpio_chip *chip = desc->gdev->chip;
3480 int offset = gpio_chip_hwgpio(desc);
3483 ret = chip->direction_output(chip, offset, 1);
3485 set_bit(FLAG_IS_OUT, &desc->flags);
3487 ret = chip->direction_input(chip, offset);
3489 clear_bit(FLAG_IS_OUT, &desc->flags);
3491 trace_gpio_direction(desc_to_gpio(desc), !value, ret);
3494 "%s: Error in set_value for open source err %d\n",
3498 static void gpiod_set_raw_value_commit(struct gpio_desc *desc, bool value)
3500 struct gpio_chip *chip;
3502 chip = desc->gdev->chip;
3503 trace_gpio_value(desc_to_gpio(desc), 0, value);
3504 chip->set(chip, gpio_chip_hwgpio(desc), value);
3508 * set multiple outputs on the same chip;
3509 * use the chip's set_multiple function if available;
3510 * otherwise set the outputs sequentially;
3511 * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word
3512 * defines which outputs are to be changed
3513 * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word
3514 * defines the values the outputs specified by mask are to be set to
3516 static void gpio_chip_set_multiple(struct gpio_chip *chip,
3517 unsigned long *mask, unsigned long *bits)
3519 if (chip->set_multiple) {
3520 chip->set_multiple(chip, mask, bits);
3524 /* set outputs if the corresponding mask bit is set */
3525 for_each_set_bit(i, mask, chip->ngpio)
3526 chip->set(chip, i, test_bit(i, bits));
3530 int gpiod_set_array_value_complex(bool raw, bool can_sleep,
3531 unsigned int array_size,
3532 struct gpio_desc **desc_array,
3533 struct gpio_array *array_info,
3534 unsigned long *value_bitmap)
3539 * Validate array_info against desc_array and its size.
3540 * It should immediately follow desc_array if both
3541 * have been obtained from the same gpiod_get_array() call.
3543 if (array_info && array_info->desc == desc_array &&
3544 array_size <= array_info->size &&
3545 (void *)array_info == desc_array + array_info->size) {
3547 WARN_ON(array_info->chip->can_sleep);
3549 if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
3550 bitmap_xor(value_bitmap, value_bitmap,
3551 array_info->invert_mask, array_size);
3553 gpio_chip_set_multiple(array_info->chip, array_info->set_mask,
3556 if (bitmap_full(array_info->set_mask, array_size))
3559 i = find_first_zero_bit(array_info->set_mask, array_size);
3564 while (i < array_size) {
3565 struct gpio_chip *chip = desc_array[i]->gdev->chip;
3566 unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
3567 unsigned long *mask, *bits;
3570 if (likely(chip->ngpio <= FASTPATH_NGPIO)) {
3573 mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio),
3575 can_sleep ? GFP_KERNEL : GFP_ATOMIC);
3580 bits = mask + BITS_TO_LONGS(chip->ngpio);
3581 bitmap_zero(mask, chip->ngpio);
3584 WARN_ON(chip->can_sleep);
3587 struct gpio_desc *desc = desc_array[i];
3588 int hwgpio = gpio_chip_hwgpio(desc);
3589 int value = test_bit(i, value_bitmap);
3592 * Pins applicable for fast input but not for
3593 * fast output processing may have been already
3594 * inverted inside the fast path, skip them.
3596 if (!raw && !(array_info &&
3597 test_bit(i, array_info->invert_mask)) &&
3598 test_bit(FLAG_ACTIVE_LOW, &desc->flags))
3600 trace_gpio_value(desc_to_gpio(desc), 0, value);
3602 * collect all normal outputs belonging to the same chip
3603 * open drain and open source outputs are set individually
3605 if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && !raw) {
3606 gpio_set_open_drain_value_commit(desc, value);
3607 } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags) && !raw) {
3608 gpio_set_open_source_value_commit(desc, value);
3610 __set_bit(hwgpio, mask);
3612 __set_bit(hwgpio, bits);
3614 __clear_bit(hwgpio, bits);
3620 i = find_next_zero_bit(array_info->set_mask,
3622 } while ((i < array_size) &&
3623 (desc_array[i]->gdev->chip == chip));
3624 /* push collected bits to outputs */
3626 gpio_chip_set_multiple(chip, mask, bits);
3628 if (mask != fastpath)
3635 * gpiod_set_raw_value() - assign a gpio's raw value
3636 * @desc: gpio whose value will be assigned
3637 * @value: value to assign
3639 * Set the raw value of the GPIO, i.e. the value of its physical line without
3640 * regard for its ACTIVE_LOW status.
3642 * This function can be called from contexts where we cannot sleep, and will
3643 * complain if the GPIO chip functions potentially sleep.
3645 void gpiod_set_raw_value(struct gpio_desc *desc, int value)
3647 VALIDATE_DESC_VOID(desc);
3648 /* Should be using gpiod_set_raw_value_cansleep() */
3649 WARN_ON(desc->gdev->chip->can_sleep);
3650 gpiod_set_raw_value_commit(desc, value);
3652 EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
3655 * gpiod_set_value_nocheck() - set a GPIO line value without checking
3656 * @desc: the descriptor to set the value on
3657 * @value: value to set
3659 * This sets the value of a GPIO line backing a descriptor, applying
3660 * different semantic quirks like active low and open drain/source
3663 static void gpiod_set_value_nocheck(struct gpio_desc *desc, int value)
3665 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
3667 if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
3668 gpio_set_open_drain_value_commit(desc, value);
3669 else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
3670 gpio_set_open_source_value_commit(desc, value);
3672 gpiod_set_raw_value_commit(desc, value);
3676 * gpiod_set_value() - assign a gpio's value
3677 * @desc: gpio whose value will be assigned
3678 * @value: value to assign
3680 * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW,
3681 * OPEN_DRAIN and OPEN_SOURCE flags into account.
3683 * This function can be called from contexts where we cannot sleep, and will
3684 * complain if the GPIO chip functions potentially sleep.
3686 void gpiod_set_value(struct gpio_desc *desc, int value)
3688 VALIDATE_DESC_VOID(desc);
3689 /* Should be using gpiod_set_value_cansleep() */
3690 WARN_ON(desc->gdev->chip->can_sleep);
3691 gpiod_set_value_nocheck(desc, value);
3693 EXPORT_SYMBOL_GPL(gpiod_set_value);
3696 * gpiod_set_raw_array_value() - assign values to an array of GPIOs
3697 * @array_size: number of elements in the descriptor array / value bitmap
3698 * @desc_array: array of GPIO descriptors whose values will be assigned
3699 * @array_info: information on applicability of fast bitmap processing path
3700 * @value_bitmap: bitmap of values to assign
3702 * Set the raw values of the GPIOs, i.e. the values of the physical lines
3703 * without regard for their ACTIVE_LOW status.
3705 * This function can be called from contexts where we cannot sleep, and will
3706 * complain if the GPIO chip functions potentially sleep.
3708 int gpiod_set_raw_array_value(unsigned int array_size,
3709 struct gpio_desc **desc_array,
3710 struct gpio_array *array_info,
3711 unsigned long *value_bitmap)
3715 return gpiod_set_array_value_complex(true, false, array_size,
3716 desc_array, array_info, value_bitmap);
3718 EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
3721 * gpiod_set_array_value() - assign values to an array of GPIOs
3722 * @array_size: number of elements in the descriptor array / value bitmap
3723 * @desc_array: array of GPIO descriptors whose values will be assigned
3724 * @array_info: information on applicability of fast bitmap processing path
3725 * @value_bitmap: bitmap of values to assign
3727 * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
3730 * This function can be called from contexts where we cannot sleep, and will
3731 * complain if the GPIO chip functions potentially sleep.
3733 int gpiod_set_array_value(unsigned int array_size,
3734 struct gpio_desc **desc_array,
3735 struct gpio_array *array_info,
3736 unsigned long *value_bitmap)
3740 return gpiod_set_array_value_complex(false, false, array_size,
3741 desc_array, array_info,
3744 EXPORT_SYMBOL_GPL(gpiod_set_array_value);
3747 * gpiod_cansleep() - report whether gpio value access may sleep
3748 * @desc: gpio to check
3751 int gpiod_cansleep(const struct gpio_desc *desc)
3753 VALIDATE_DESC(desc);
3754 return desc->gdev->chip->can_sleep;
3756 EXPORT_SYMBOL_GPL(gpiod_cansleep);
3759 * gpiod_set_consumer_name() - set the consumer name for the descriptor
3760 * @desc: gpio to set the consumer name on
3761 * @name: the new consumer name
3763 int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name)
3765 VALIDATE_DESC(desc);
3767 name = kstrdup_const(name, GFP_KERNEL);
3772 kfree_const(desc->label);
3773 desc_set_label(desc, name);
3777 EXPORT_SYMBOL_GPL(gpiod_set_consumer_name);
3780 * gpiod_to_irq() - return the IRQ corresponding to a GPIO
3781 * @desc: gpio whose IRQ will be returned (already requested)
3783 * Return the IRQ corresponding to the passed GPIO, or an error code in case of
3786 int gpiod_to_irq(const struct gpio_desc *desc)
3788 struct gpio_chip *chip;
3792 * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics
3793 * requires this function to not return zero on an invalid descriptor
3794 * but rather a negative error number.
3796 if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip)
3799 chip = desc->gdev->chip;
3800 offset = gpio_chip_hwgpio(desc);
3802 int retirq = chip->to_irq(chip, offset);
3804 /* Zero means NO_IRQ */
3812 EXPORT_SYMBOL_GPL(gpiod_to_irq);
3815 * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ
3816 * @chip: the chip the GPIO to lock belongs to
3817 * @offset: the offset of the GPIO to lock as IRQ
3819 * This is used directly by GPIO drivers that want to lock down
3820 * a certain GPIO line to be used for IRQs.
3822 int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
3824 struct gpio_desc *desc;
3826 desc = gpiochip_get_desc(chip, offset);
3828 return PTR_ERR(desc);
3831 * If it's fast: flush the direction setting if something changed
3834 if (!chip->can_sleep && chip->get_direction) {
3835 int dir = gpiod_get_direction(desc);
3838 chip_err(chip, "%s: cannot get GPIO direction\n",
3844 if (test_bit(FLAG_IS_OUT, &desc->flags)) {
3846 "%s: tried to flag a GPIO set as output for IRQ\n",
3851 set_bit(FLAG_USED_AS_IRQ, &desc->flags);
3852 set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags);
3855 * If the consumer has not set up a label (such as when the
3856 * IRQ is referenced from .to_irq()) we set up a label here
3857 * so it is clear this is used as an interrupt.
3860 desc_set_label(desc, "interrupt");
3864 EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq);
3867 * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ
3868 * @chip: the chip the GPIO to lock belongs to
3869 * @offset: the offset of the GPIO to lock as IRQ
3871 * This is used directly by GPIO drivers that want to indicate
3872 * that a certain GPIO is no longer used exclusively for IRQ.
3874 void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
3876 struct gpio_desc *desc;
3878 desc = gpiochip_get_desc(chip, offset);
3882 clear_bit(FLAG_USED_AS_IRQ, &desc->flags);
3883 clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags);
3885 /* If we only had this marking, erase it */
3886 if (desc->label && !strcmp(desc->label, "interrupt"))
3887 desc_set_label(desc, NULL);
3889 EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq);
3891 void gpiochip_disable_irq(struct gpio_chip *chip, unsigned int offset)
3893 struct gpio_desc *desc = gpiochip_get_desc(chip, offset);
3895 if (!IS_ERR(desc) &&
3896 !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags)))
3897 clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags);
3899 EXPORT_SYMBOL_GPL(gpiochip_disable_irq);
3901 void gpiochip_enable_irq(struct gpio_chip *chip, unsigned int offset)
3903 struct gpio_desc *desc = gpiochip_get_desc(chip, offset);
3905 if (!IS_ERR(desc) &&
3906 !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) {
3907 WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags));
3908 set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags);
3911 EXPORT_SYMBOL_GPL(gpiochip_enable_irq);
3913 bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset)
3915 if (offset >= chip->ngpio)
3918 return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags);
3920 EXPORT_SYMBOL_GPL(gpiochip_line_is_irq);
3922 int gpiochip_reqres_irq(struct gpio_chip *chip, unsigned int offset)
3926 if (!try_module_get(chip->gpiodev->owner))
3929 ret = gpiochip_lock_as_irq(chip, offset);
3931 chip_err(chip, "unable to lock HW IRQ %u for IRQ\n", offset);
3932 module_put(chip->gpiodev->owner);
3937 EXPORT_SYMBOL_GPL(gpiochip_reqres_irq);
3939 void gpiochip_relres_irq(struct gpio_chip *chip, unsigned int offset)
3941 gpiochip_unlock_as_irq(chip, offset);
3942 module_put(chip->gpiodev->owner);
3944 EXPORT_SYMBOL_GPL(gpiochip_relres_irq);
3946 bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset)
3948 if (offset >= chip->ngpio)
3951 return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags);
3953 EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain);
3955 bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset)
3957 if (offset >= chip->ngpio)
3960 return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags);
3962 EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source);
3964 bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset)
3966 if (offset >= chip->ngpio)
3969 return !test_bit(FLAG_TRANSITORY, &chip->gpiodev->descs[offset].flags);
3971 EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent);
3974 * gpiod_get_raw_value_cansleep() - return a gpio's raw value
3975 * @desc: gpio whose value will be returned
3977 * Return the GPIO's raw value, i.e. the value of the physical line disregarding
3978 * its ACTIVE_LOW status, or negative errno on failure.
3980 * This function is to be called from contexts that can sleep.
3982 int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
3984 might_sleep_if(extra_checks);
3985 VALIDATE_DESC(desc);
3986 return gpiod_get_raw_value_commit(desc);
3988 EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep);
3991 * gpiod_get_value_cansleep() - return a gpio's value
3992 * @desc: gpio whose value will be returned
3994 * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into
3995 * account, or negative errno on failure.
3997 * This function is to be called from contexts that can sleep.
3999 int gpiod_get_value_cansleep(const struct gpio_desc *desc)
4003 might_sleep_if(extra_checks);
4004 VALIDATE_DESC(desc);
4005 value = gpiod_get_raw_value_commit(desc);
4009 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
4014 EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
4017 * gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs
4018 * @array_size: number of elements in the descriptor array / value bitmap
4019 * @desc_array: array of GPIO descriptors whose values will be read
4020 * @array_info: information on applicability of fast bitmap processing path
4021 * @value_bitmap: bitmap to store the read values
4023 * Read the raw values of the GPIOs, i.e. the values of the physical lines
4024 * without regard for their ACTIVE_LOW status. Return 0 in case of success,
4025 * else an error code.
4027 * This function is to be called from contexts that can sleep.
4029 int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
4030 struct gpio_desc **desc_array,
4031 struct gpio_array *array_info,
4032 unsigned long *value_bitmap)
4034 might_sleep_if(extra_checks);
4037 return gpiod_get_array_value_complex(true, true, array_size,
4038 desc_array, array_info,
4041 EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
4044 * gpiod_get_array_value_cansleep() - read values from an array of GPIOs
4045 * @array_size: number of elements in the descriptor array / value bitmap
4046 * @desc_array: array of GPIO descriptors whose values will be read
4047 * @array_info: information on applicability of fast bitmap processing path
4048 * @value_bitmap: bitmap to store the read values
4050 * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
4051 * into account. Return 0 in case of success, else an error code.
4053 * This function is to be called from contexts that can sleep.
4055 int gpiod_get_array_value_cansleep(unsigned int array_size,
4056 struct gpio_desc **desc_array,
4057 struct gpio_array *array_info,
4058 unsigned long *value_bitmap)
4060 might_sleep_if(extra_checks);
4063 return gpiod_get_array_value_complex(false, true, array_size,
4064 desc_array, array_info,
4067 EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
4070 * gpiod_set_raw_value_cansleep() - assign a gpio's raw value
4071 * @desc: gpio whose value will be assigned
4072 * @value: value to assign
4074 * Set the raw value of the GPIO, i.e. the value of its physical line without
4075 * regard for its ACTIVE_LOW status.
4077 * This function is to be called from contexts that can sleep.
4079 void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value)
4081 might_sleep_if(extra_checks);
4082 VALIDATE_DESC_VOID(desc);
4083 gpiod_set_raw_value_commit(desc, value);
4085 EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep);
4088 * gpiod_set_value_cansleep() - assign a gpio's value
4089 * @desc: gpio whose value will be assigned
4090 * @value: value to assign
4092 * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
4095 * This function is to be called from contexts that can sleep.
4097 void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
4099 might_sleep_if(extra_checks);
4100 VALIDATE_DESC_VOID(desc);
4101 gpiod_set_value_nocheck(desc, value);
4103 EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
4106 * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs
4107 * @array_size: number of elements in the descriptor array / value bitmap
4108 * @desc_array: array of GPIO descriptors whose values will be assigned
4109 * @array_info: information on applicability of fast bitmap processing path
4110 * @value_bitmap: bitmap of values to assign
4112 * Set the raw values of the GPIOs, i.e. the values of the physical lines
4113 * without regard for their ACTIVE_LOW status.
4115 * This function is to be called from contexts that can sleep.
4117 int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
4118 struct gpio_desc **desc_array,
4119 struct gpio_array *array_info,
4120 unsigned long *value_bitmap)
4122 might_sleep_if(extra_checks);
4125 return gpiod_set_array_value_complex(true, true, array_size, desc_array,
4126 array_info, value_bitmap);
4128 EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
4131 * gpiod_add_lookup_tables() - register GPIO device consumers
4132 * @tables: list of tables of consumers to register
4133 * @n: number of tables in the list
4135 void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
4139 mutex_lock(&gpio_lookup_lock);
4141 for (i = 0; i < n; i++)
4142 list_add_tail(&tables[i]->list, &gpio_lookup_list);
4144 mutex_unlock(&gpio_lookup_lock);
4148 * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs
4149 * @array_size: number of elements in the descriptor array / value bitmap
4150 * @desc_array: array of GPIO descriptors whose values will be assigned
4151 * @array_info: information on applicability of fast bitmap processing path
4152 * @value_bitmap: bitmap of values to assign
4154 * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
4157 * This function is to be called from contexts that can sleep.
4159 int gpiod_set_array_value_cansleep(unsigned int array_size,
4160 struct gpio_desc **desc_array,
4161 struct gpio_array *array_info,
4162 unsigned long *value_bitmap)
4164 might_sleep_if(extra_checks);
4167 return gpiod_set_array_value_complex(false, true, array_size,
4168 desc_array, array_info,
4171 EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
4174 * gpiod_add_lookup_table() - register GPIO device consumers
4175 * @table: table of consumers to register
4177 void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
4179 mutex_lock(&gpio_lookup_lock);
4181 list_add_tail(&table->list, &gpio_lookup_list);
4183 mutex_unlock(&gpio_lookup_lock);
4185 EXPORT_SYMBOL_GPL(gpiod_add_lookup_table);
4188 * gpiod_remove_lookup_table() - unregister GPIO device consumers
4189 * @table: table of consumers to unregister
4191 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table)
4193 mutex_lock(&gpio_lookup_lock);
4195 list_del(&table->list);
4197 mutex_unlock(&gpio_lookup_lock);
4199 EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table);
4202 * gpiod_add_hogs() - register a set of GPIO hogs from machine code
4203 * @hogs: table of gpio hog entries with a zeroed sentinel at the end
4205 void gpiod_add_hogs(struct gpiod_hog *hogs)
4207 struct gpio_chip *chip;
4208 struct gpiod_hog *hog;
4210 mutex_lock(&gpio_machine_hogs_mutex);
4212 for (hog = &hogs[0]; hog->chip_label; hog++) {
4213 list_add_tail(&hog->list, &gpio_machine_hogs);
4216 * The chip may have been registered earlier, so check if it
4217 * exists and, if so, try to hog the line now.
4219 chip = find_chip_by_name(hog->chip_label);
4221 gpiochip_machine_hog(chip, hog);
4224 mutex_unlock(&gpio_machine_hogs_mutex);
4226 EXPORT_SYMBOL_GPL(gpiod_add_hogs);
4228 static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev)
4230 const char *dev_id = dev ? dev_name(dev) : NULL;
4231 struct gpiod_lookup_table *table;
4233 mutex_lock(&gpio_lookup_lock);
4235 list_for_each_entry(table, &gpio_lookup_list, list) {
4236 if (table->dev_id && dev_id) {
4238 * Valid strings on both ends, must be identical to have
4241 if (!strcmp(table->dev_id, dev_id))
4245 * One of the pointers is NULL, so both must be to have
4248 if (dev_id == table->dev_id)
4255 mutex_unlock(&gpio_lookup_lock);
4259 static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
4260 unsigned int idx, unsigned long *flags)
4262 struct gpio_desc *desc = ERR_PTR(-ENOENT);
4263 struct gpiod_lookup_table *table;
4264 struct gpiod_lookup *p;
4266 table = gpiod_find_lookup_table(dev);
4270 for (p = &table->table[0]; p->chip_label; p++) {
4271 struct gpio_chip *chip;
4273 /* idx must always match exactly */
4277 /* If the lookup entry has a con_id, require exact match */
4278 if (p->con_id && (!con_id || strcmp(p->con_id, con_id)))
4281 chip = find_chip_by_name(p->chip_label);
4285 * As the lookup table indicates a chip with
4286 * p->chip_label should exist, assume it may
4287 * still appear later and let the interested
4288 * consumer be probed again or let the Deferred
4289 * Probe infrastructure handle the error.
4291 dev_warn(dev, "cannot find GPIO chip %s, deferring\n",
4293 return ERR_PTR(-EPROBE_DEFER);
4296 if (chip->ngpio <= p->chip_hwnum) {
4298 "requested GPIO %d is out of range [0..%d] for chip %s\n",
4299 idx, chip->ngpio, chip->label);
4300 return ERR_PTR(-EINVAL);
4303 desc = gpiochip_get_desc(chip, p->chip_hwnum);
4312 static int platform_gpio_count(struct device *dev, const char *con_id)
4314 struct gpiod_lookup_table *table;
4315 struct gpiod_lookup *p;
4316 unsigned int count = 0;
4318 table = gpiod_find_lookup_table(dev);
4322 for (p = &table->table[0]; p->chip_label; p++) {
4323 if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) ||
4324 (!con_id && !p->con_id))
4334 * fwnode_gpiod_get_index - obtain a GPIO from firmware node
4335 * @fwnode: handle of the firmware node
4336 * @con_id: function within the GPIO consumer
4337 * @index: index of the GPIO to obtain for the consumer
4338 * @flags: GPIO initialization flags
4339 * @label: label to attach to the requested GPIO
4341 * This function can be used for drivers that get their configuration
4342 * from opaque firmware.
4344 * The function properly finds the corresponding GPIO using whatever is the
4345 * underlying firmware interface and then makes sure that the GPIO
4346 * descriptor is requested before it is returned to the caller.
4349 * On successful request the GPIO pin is configured in accordance with
4352 * In case of error an ERR_PTR() is returned.
4354 struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode,
4355 const char *con_id, int index,
4356 enum gpiod_flags flags,
4359 struct gpio_desc *desc;
4360 char prop_name[32]; /* 32 is max size of property name */
4363 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
4365 snprintf(prop_name, sizeof(prop_name), "%s-%s",
4366 con_id, gpio_suffixes[i]);
4368 snprintf(prop_name, sizeof(prop_name), "%s",
4371 desc = fwnode_get_named_gpiod(fwnode, prop_name, index, flags,
4373 if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT))
4379 EXPORT_SYMBOL_GPL(fwnode_gpiod_get_index);
4382 * gpiod_count - return the number of GPIOs associated with a device / function
4383 * or -ENOENT if no GPIO has been assigned to the requested function
4384 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4385 * @con_id: function within the GPIO consumer
4387 int gpiod_count(struct device *dev, const char *con_id)
4389 int count = -ENOENT;
4391 if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node)
4392 count = of_gpio_get_count(dev, con_id);
4393 else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev))
4394 count = acpi_gpio_count(dev, con_id);
4397 count = platform_gpio_count(dev, con_id);
4401 EXPORT_SYMBOL_GPL(gpiod_count);
4404 * gpiod_get - obtain a GPIO for a given GPIO function
4405 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4406 * @con_id: function within the GPIO consumer
4407 * @flags: optional GPIO initialization flags
4409 * Return the GPIO descriptor corresponding to the function con_id of device
4410 * dev, -ENOENT if no GPIO has been assigned to the requested function, or
4411 * another IS_ERR() code if an error occurred while trying to acquire the GPIO.
4413 struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id,
4414 enum gpiod_flags flags)
4416 return gpiod_get_index(dev, con_id, 0, flags);
4418 EXPORT_SYMBOL_GPL(gpiod_get);
4421 * gpiod_get_optional - obtain an optional GPIO for a given GPIO function
4422 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4423 * @con_id: function within the GPIO consumer
4424 * @flags: optional GPIO initialization flags
4426 * This is equivalent to gpiod_get(), except that when no GPIO was assigned to
4427 * the requested function it will return NULL. This is convenient for drivers
4428 * that need to handle optional GPIOs.
4430 struct gpio_desc *__must_check gpiod_get_optional(struct device *dev,
4432 enum gpiod_flags flags)
4434 return gpiod_get_index_optional(dev, con_id, 0, flags);
4436 EXPORT_SYMBOL_GPL(gpiod_get_optional);
4440 * gpiod_configure_flags - helper function to configure a given GPIO
4441 * @desc: gpio whose value will be assigned
4442 * @con_id: function within the GPIO consumer
4443 * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from
4444 * of_find_gpio() or of_get_gpio_hog()
4445 * @dflags: gpiod_flags - optional GPIO initialization flags
4447 * Return 0 on success, -ENOENT if no GPIO has been assigned to the
4448 * requested function and/or index, or another IS_ERR() code if an error
4449 * occurred while trying to acquire the GPIO.
4451 int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
4452 unsigned long lflags, enum gpiod_flags dflags)
4456 if (lflags & GPIO_ACTIVE_LOW)
4457 set_bit(FLAG_ACTIVE_LOW, &desc->flags);
4459 if (lflags & GPIO_OPEN_DRAIN)
4460 set_bit(FLAG_OPEN_DRAIN, &desc->flags);
4461 else if (dflags & GPIOD_FLAGS_BIT_OPEN_DRAIN) {
4463 * This enforces open drain mode from the consumer side.
4464 * This is necessary for some busses like I2C, but the lookup
4465 * should *REALLY* have specified them as open drain in the
4466 * first place, so print a little warning here.
4468 set_bit(FLAG_OPEN_DRAIN, &desc->flags);
4470 "enforced open drain please flag it properly in DT/ACPI DSDT/board file\n");
4473 if (lflags & GPIO_OPEN_SOURCE)
4474 set_bit(FLAG_OPEN_SOURCE, &desc->flags);
4476 if ((lflags & GPIO_PULL_UP) && (lflags & GPIO_PULL_DOWN)) {
4478 "both pull-up and pull-down enabled, invalid configuration\n");
4482 if (lflags & GPIO_PULL_UP)
4483 set_bit(FLAG_PULL_UP, &desc->flags);
4484 else if (lflags & GPIO_PULL_DOWN)
4485 set_bit(FLAG_PULL_DOWN, &desc->flags);
4487 ret = gpiod_set_transitory(desc, (lflags & GPIO_TRANSITORY));
4491 /* No particular flag request, return here... */
4492 if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) {
4493 pr_debug("no flags found for %s\n", con_id);
4498 if (dflags & GPIOD_FLAGS_BIT_DIR_OUT)
4499 ret = gpiod_direction_output(desc,
4500 !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL));
4502 ret = gpiod_direction_input(desc);
4508 * gpiod_get_index - obtain a GPIO from a multi-index GPIO function
4509 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4510 * @con_id: function within the GPIO consumer
4511 * @idx: index of the GPIO to obtain in the consumer
4512 * @flags: optional GPIO initialization flags
4514 * This variant of gpiod_get() allows to access GPIOs other than the first
4515 * defined one for functions that define several GPIOs.
4517 * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the
4518 * requested function and/or index, or another IS_ERR() code if an error
4519 * occurred while trying to acquire the GPIO.
4521 struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
4524 enum gpiod_flags flags)
4526 unsigned long lookupflags = GPIO_LOOKUP_FLAGS_DEFAULT;
4527 struct gpio_desc *desc = NULL;
4529 /* Maybe we have a device name, maybe not */
4530 const char *devname = dev ? dev_name(dev) : "?";
4532 dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id);
4535 /* Using device tree? */
4536 if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
4537 dev_dbg(dev, "using device tree for GPIO lookup\n");
4538 desc = of_find_gpio(dev, con_id, idx, &lookupflags);
4539 } else if (ACPI_COMPANION(dev)) {
4540 dev_dbg(dev, "using ACPI for GPIO lookup\n");
4541 desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags);
4546 * Either we are not using DT or ACPI, or their lookup did not return
4547 * a result. In that case, use platform lookup as a fallback.
4549 if (!desc || desc == ERR_PTR(-ENOENT)) {
4550 dev_dbg(dev, "using lookup tables for GPIO lookup\n");
4551 desc = gpiod_find(dev, con_id, idx, &lookupflags);
4555 dev_dbg(dev, "No GPIO consumer %s found\n", con_id);
4560 * If a connection label was passed use that, else attempt to use
4561 * the device name as label
4563 ret = gpiod_request(desc, con_id ? con_id : devname);
4565 if (ret == -EBUSY && flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) {
4567 * This happens when there are several consumers for
4568 * the same GPIO line: we just return here without
4569 * further initialization. It is a bit if a hack.
4570 * This is necessary to support fixed regulators.
4572 * FIXME: Make this more sane and safe.
4574 dev_info(dev, "nonexclusive access to GPIO for %s\n",
4575 con_id ? con_id : devname);
4578 return ERR_PTR(ret);
4582 ret = gpiod_configure_flags(desc, con_id, lookupflags, flags);
4584 dev_dbg(dev, "setup of GPIO %s failed\n", con_id);
4586 return ERR_PTR(ret);
4591 EXPORT_SYMBOL_GPL(gpiod_get_index);
4594 * fwnode_get_named_gpiod - obtain a GPIO from firmware node
4595 * @fwnode: handle of the firmware node
4596 * @propname: name of the firmware property representing the GPIO
4597 * @index: index of the GPIO to obtain for the consumer
4598 * @dflags: GPIO initialization flags
4599 * @label: label to attach to the requested GPIO
4601 * This function can be used for drivers that get their configuration
4602 * from opaque firmware.
4604 * The function properly finds the corresponding GPIO using whatever is the
4605 * underlying firmware interface and then makes sure that the GPIO
4606 * descriptor is requested before it is returned to the caller.
4609 * On successful request the GPIO pin is configured in accordance with
4612 * In case of error an ERR_PTR() is returned.
4614 struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
4615 const char *propname, int index,
4616 enum gpiod_flags dflags,
4619 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
4620 struct gpio_desc *desc = ERR_PTR(-ENODEV);
4624 return ERR_PTR(-EINVAL);
4626 if (is_of_node(fwnode)) {
4627 desc = gpiod_get_from_of_node(to_of_node(fwnode),
4632 } else if (is_acpi_node(fwnode)) {
4633 struct acpi_gpio_info info;
4635 desc = acpi_node_get_gpiod(fwnode, propname, index, &info);
4639 acpi_gpio_update_gpiod_flags(&dflags, &info);
4640 acpi_gpio_update_gpiod_lookup_flags(&lflags, &info);
4643 /* Currently only ACPI takes this path */
4644 ret = gpiod_request(desc, label);
4646 return ERR_PTR(ret);
4648 ret = gpiod_configure_flags(desc, propname, lflags, dflags);
4651 return ERR_PTR(ret);
4656 EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod);
4659 * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO
4661 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4662 * @con_id: function within the GPIO consumer
4663 * @index: index of the GPIO to obtain in the consumer
4664 * @flags: optional GPIO initialization flags
4666 * This is equivalent to gpiod_get_index(), except that when no GPIO with the
4667 * specified index was assigned to the requested function it will return NULL.
4668 * This is convenient for drivers that need to handle optional GPIOs.
4670 struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
4673 enum gpiod_flags flags)
4675 struct gpio_desc *desc;
4677 desc = gpiod_get_index(dev, con_id, index, flags);
4679 if (PTR_ERR(desc) == -ENOENT)
4685 EXPORT_SYMBOL_GPL(gpiod_get_index_optional);
4688 * gpiod_hog - Hog the specified GPIO desc given the provided flags
4689 * @desc: gpio whose value will be assigned
4690 * @name: gpio line name
4691 * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from
4692 * of_find_gpio() or of_get_gpio_hog()
4693 * @dflags: gpiod_flags - optional GPIO initialization flags
4695 int gpiod_hog(struct gpio_desc *desc, const char *name,
4696 unsigned long lflags, enum gpiod_flags dflags)
4698 struct gpio_chip *chip;
4699 struct gpio_desc *local_desc;
4703 chip = gpiod_to_chip(desc);
4704 hwnum = gpio_chip_hwgpio(desc);
4706 local_desc = gpiochip_request_own_desc(chip, hwnum, name,
4708 if (IS_ERR(local_desc)) {
4709 ret = PTR_ERR(local_desc);
4710 pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n",
4711 name, chip->label, hwnum, ret);
4715 /* Mark GPIO as hogged so it can be identified and removed later */
4716 set_bit(FLAG_IS_HOGGED, &desc->flags);
4718 pr_info("GPIO line %d (%s) hogged as %s%s\n",
4719 desc_to_gpio(desc), name,
4720 (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input",
4721 (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ?
4722 (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":"");
4728 * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog
4729 * @chip: gpio chip to act on
4731 static void gpiochip_free_hogs(struct gpio_chip *chip)
4735 for (id = 0; id < chip->ngpio; id++) {
4736 if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags))
4737 gpiochip_free_own_desc(&chip->gpiodev->descs[id]);
4742 * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function
4743 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4744 * @con_id: function within the GPIO consumer
4745 * @flags: optional GPIO initialization flags
4747 * This function acquires all the GPIOs defined under a given function.
4749 * Return a struct gpio_descs containing an array of descriptors, -ENOENT if
4750 * no GPIO has been assigned to the requested function, or another IS_ERR()
4751 * code if an error occurred while trying to acquire the GPIOs.
4753 struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
4755 enum gpiod_flags flags)
4757 struct gpio_desc *desc;
4758 struct gpio_descs *descs;
4759 struct gpio_array *array_info = NULL;
4760 struct gpio_chip *chip;
4761 int count, bitmap_size;
4763 count = gpiod_count(dev, con_id);
4765 return ERR_PTR(count);
4767 descs = kzalloc(struct_size(descs, desc, count), GFP_KERNEL);
4769 return ERR_PTR(-ENOMEM);
4771 for (descs->ndescs = 0; descs->ndescs < count; ) {
4772 desc = gpiod_get_index(dev, con_id, descs->ndescs, flags);
4774 gpiod_put_array(descs);
4775 return ERR_CAST(desc);
4778 descs->desc[descs->ndescs] = desc;
4780 chip = gpiod_to_chip(desc);
4782 * If pin hardware number of array member 0 is also 0, select
4783 * its chip as a candidate for fast bitmap processing path.
4785 if (descs->ndescs == 0 && gpio_chip_hwgpio(desc) == 0) {
4786 struct gpio_descs *array;
4788 bitmap_size = BITS_TO_LONGS(chip->ngpio > count ?
4789 chip->ngpio : count);
4791 array = kzalloc(struct_size(descs, desc, count) +
4792 struct_size(array_info, invert_mask,
4793 3 * bitmap_size), GFP_KERNEL);
4795 gpiod_put_array(descs);
4796 return ERR_PTR(-ENOMEM);
4799 memcpy(array, descs,
4800 struct_size(descs, desc, descs->ndescs + 1));
4804 array_info = (void *)(descs->desc + count);
4805 array_info->get_mask = array_info->invert_mask +
4807 array_info->set_mask = array_info->get_mask +
4810 array_info->desc = descs->desc;
4811 array_info->size = count;
4812 array_info->chip = chip;
4813 bitmap_set(array_info->get_mask, descs->ndescs,
4814 count - descs->ndescs);
4815 bitmap_set(array_info->set_mask, descs->ndescs,
4816 count - descs->ndescs);
4817 descs->info = array_info;
4819 /* Unmark array members which don't belong to the 'fast' chip */
4820 if (array_info && array_info->chip != chip) {
4821 __clear_bit(descs->ndescs, array_info->get_mask);
4822 __clear_bit(descs->ndescs, array_info->set_mask);
4825 * Detect array members which belong to the 'fast' chip
4826 * but their pins are not in hardware order.
4828 else if (array_info &&
4829 gpio_chip_hwgpio(desc) != descs->ndescs) {
4831 * Don't use fast path if all array members processed so
4832 * far belong to the same chip as this one but its pin
4833 * hardware number is different from its array index.
4835 if (bitmap_full(array_info->get_mask, descs->ndescs)) {
4838 __clear_bit(descs->ndescs,
4839 array_info->get_mask);
4840 __clear_bit(descs->ndescs,
4841 array_info->set_mask);
4843 } else if (array_info) {
4844 /* Exclude open drain or open source from fast output */
4845 if (gpiochip_line_is_open_drain(chip, descs->ndescs) ||
4846 gpiochip_line_is_open_source(chip, descs->ndescs))
4847 __clear_bit(descs->ndescs,
4848 array_info->set_mask);
4849 /* Identify 'fast' pins which require invertion */
4850 if (gpiod_is_active_low(desc))
4851 __set_bit(descs->ndescs,
4852 array_info->invert_mask);
4859 "GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n",
4860 array_info->chip->label, array_info->size,
4861 *array_info->get_mask, *array_info->set_mask,
4862 *array_info->invert_mask);
4865 EXPORT_SYMBOL_GPL(gpiod_get_array);
4868 * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO
4870 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4871 * @con_id: function within the GPIO consumer
4872 * @flags: optional GPIO initialization flags
4874 * This is equivalent to gpiod_get_array(), except that when no GPIO was
4875 * assigned to the requested function it will return NULL.
4877 struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev,
4879 enum gpiod_flags flags)
4881 struct gpio_descs *descs;
4883 descs = gpiod_get_array(dev, con_id, flags);
4884 if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT))
4889 EXPORT_SYMBOL_GPL(gpiod_get_array_optional);
4892 * gpiod_put - dispose of a GPIO descriptor
4893 * @desc: GPIO descriptor to dispose of
4895 * No descriptor can be used after gpiod_put() has been called on it.
4897 void gpiod_put(struct gpio_desc *desc)
4902 EXPORT_SYMBOL_GPL(gpiod_put);
4905 * gpiod_put_array - dispose of multiple GPIO descriptors
4906 * @descs: struct gpio_descs containing an array of descriptors
4908 void gpiod_put_array(struct gpio_descs *descs)
4912 for (i = 0; i < descs->ndescs; i++)
4913 gpiod_put(descs->desc[i]);
4917 EXPORT_SYMBOL_GPL(gpiod_put_array);
4919 static int __init gpiolib_dev_init(void)
4923 /* Register GPIO sysfs bus */
4924 ret = bus_register(&gpio_bus_type);
4926 pr_err("gpiolib: could not register GPIO bus type\n");
4930 ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip");
4932 pr_err("gpiolib: failed to allocate char dev region\n");
4933 bus_unregister(&gpio_bus_type);
4935 gpiolib_initialized = true;
4936 gpiochip_setup_devs();
4940 core_initcall(gpiolib_dev_init);
4942 #ifdef CONFIG_DEBUG_FS
4944 static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev)
4947 struct gpio_chip *chip = gdev->chip;
4948 unsigned gpio = gdev->base;
4949 struct gpio_desc *gdesc = &gdev->descs[0];
4954 for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) {
4955 if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) {
4957 seq_printf(s, " gpio-%-3d (%-20.20s)\n",
4963 gpiod_get_direction(gdesc);
4964 is_out = test_bit(FLAG_IS_OUT, &gdesc->flags);
4965 is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags);
4966 active_low = test_bit(FLAG_ACTIVE_LOW, &gdesc->flags);
4967 seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s%s",
4968 gpio, gdesc->name ? gdesc->name : "", gdesc->label,
4969 is_out ? "out" : "in ",
4970 chip->get ? (chip->get(chip, i) ? "hi" : "lo") : "? ",
4971 is_irq ? "IRQ " : "",
4972 active_low ? "ACTIVE LOW" : "");
4973 seq_printf(s, "\n");
4977 static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos)
4979 unsigned long flags;
4980 struct gpio_device *gdev = NULL;
4981 loff_t index = *pos;
4985 spin_lock_irqsave(&gpio_lock, flags);
4986 list_for_each_entry(gdev, &gpio_devices, list)
4988 spin_unlock_irqrestore(&gpio_lock, flags);
4991 spin_unlock_irqrestore(&gpio_lock, flags);
4996 static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos)
4998 unsigned long flags;
4999 struct gpio_device *gdev = v;
5002 spin_lock_irqsave(&gpio_lock, flags);
5003 if (list_is_last(&gdev->list, &gpio_devices))
5006 ret = list_entry(gdev->list.next, struct gpio_device, list);
5007 spin_unlock_irqrestore(&gpio_lock, flags);
5015 static void gpiolib_seq_stop(struct seq_file *s, void *v)
5019 static int gpiolib_seq_show(struct seq_file *s, void *v)
5021 struct gpio_device *gdev = v;
5022 struct gpio_chip *chip = gdev->chip;
5023 struct device *parent;
5026 seq_printf(s, "%s%s: (dangling chip)", (char *)s->private,
5027 dev_name(&gdev->dev));
5031 seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private,
5032 dev_name(&gdev->dev),
5033 gdev->base, gdev->base + gdev->ngpio - 1);
5034 parent = chip->parent;
5036 seq_printf(s, ", parent: %s/%s",
5037 parent->bus ? parent->bus->name : "no-bus",
5040 seq_printf(s, ", %s", chip->label);
5041 if (chip->can_sleep)
5042 seq_printf(s, ", can sleep");
5043 seq_printf(s, ":\n");
5046 chip->dbg_show(s, chip);
5048 gpiolib_dbg_show(s, gdev);
5053 static const struct seq_operations gpiolib_seq_ops = {
5054 .start = gpiolib_seq_start,
5055 .next = gpiolib_seq_next,
5056 .stop = gpiolib_seq_stop,
5057 .show = gpiolib_seq_show,
5060 static int gpiolib_open(struct inode *inode, struct file *file)
5062 return seq_open(file, &gpiolib_seq_ops);
5065 static const struct file_operations gpiolib_operations = {
5066 .owner = THIS_MODULE,
5067 .open = gpiolib_open,
5069 .llseek = seq_lseek,
5070 .release = seq_release,
5073 static int __init gpiolib_debugfs_init(void)
5075 /* /sys/kernel/debug/gpio */
5076 debugfs_create_file("gpio", S_IFREG | S_IRUGO, NULL, NULL,
5077 &gpiolib_operations);
5080 subsys_initcall(gpiolib_debugfs_init);
5082 #endif /* DEBUG_FS */