1 // SPDX-License-Identifier: GPL-2.0
3 * Native support for the I/O-Warrior USB devices
5 * Copyright (c) 2003-2005 Code Mercenaries GmbH
6 * written by Christian Lucht <lucht@codemercs.com>
10 * usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com>
11 * brlvger.c by Stephane Dalton <sdalton@videotron.ca>
12 * and St�hane Doyon <s.doyon@videotron.ca>
14 * Released under the GPLv2.
17 #include <linux/module.h>
18 #include <linux/usb.h>
19 #include <linux/slab.h>
20 #include <linux/sched.h>
21 #include <linux/mutex.h>
22 #include <linux/poll.h>
23 #include <linux/usb/iowarrior.h>
25 #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>"
26 #define DRIVER_DESC "USB IO-Warrior driver"
28 #define USB_VENDOR_ID_CODEMERCS 1984
29 /* low speed iowarrior */
30 #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500
31 #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501
32 #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511
33 #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512
34 /* full speed iowarrior */
35 #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503
36 /* fuller speed iowarrior */
37 #define USB_DEVICE_ID_CODEMERCS_IOW28 0x1504
38 #define USB_DEVICE_ID_CODEMERCS_IOW28L 0x1505
39 #define USB_DEVICE_ID_CODEMERCS_IOW100 0x1506
42 #define USB_DEVICE_ID_CODEMERCS_IOW24SAG 0x158a
43 #define USB_DEVICE_ID_CODEMERCS_IOW56AM 0x158b
45 /* Get a minor range for your devices from the usb maintainer */
46 #ifdef CONFIG_USB_DYNAMIC_MINORS
47 #define IOWARRIOR_MINOR_BASE 0
49 #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet
52 /* interrupt input queue size */
53 #define MAX_INTERRUPT_BUFFER 16
55 maximum number of urbs that are submitted for writes at the same time,
56 this applies to the IOWarrior56 only!
57 IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls.
59 #define MAX_WRITES_IN_FLIGHT 4
61 MODULE_AUTHOR(DRIVER_AUTHOR);
62 MODULE_DESCRIPTION(DRIVER_DESC);
63 MODULE_LICENSE("GPL");
65 static struct usb_driver iowarrior_driver;
71 /* Structure to hold all of our device specific stuff */
73 struct mutex mutex; /* locks this structure */
74 struct usb_device *udev; /* save off the usb device pointer */
75 struct usb_interface *interface; /* the interface for this device */
76 unsigned char minor; /* the starting minor number for this device */
77 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */
78 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */
79 struct urb *int_in_urb; /* the urb for reading data */
80 unsigned char *int_in_buffer; /* buffer for data to be read */
81 unsigned char serial_number; /* to detect lost packages */
82 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */
83 wait_queue_head_t read_wait;
84 wait_queue_head_t write_wait; /* wait-queue for writing to the device */
85 atomic_t write_busy; /* number of write-urbs submitted */
88 atomic_t overflow_flag; /* signals an index 'rollover' */
89 int present; /* this is 1 as long as the device is connected */
90 int opened; /* this is 1 if the device is currently open */
91 char chip_serial[9]; /* the serial number string of the chip connected */
92 int report_size; /* number of bytes in a report */
94 struct usb_anchor submitted;
102 * USB spec identifies 5 second timeouts.
104 #define GET_TIMEOUT 5
105 #define USB_REQ_GET_REPORT 0x01
107 static int usb_get_report(struct usb_device *dev,
108 struct usb_host_interface *inter, unsigned char type,
109 unsigned char id, void *buf, int size)
111 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
113 USB_DIR_IN | USB_TYPE_CLASS |
114 USB_RECIP_INTERFACE, (type << 8) + id,
115 inter->desc.bInterfaceNumber, buf, size,
120 #define USB_REQ_SET_REPORT 0x09
122 static int usb_set_report(struct usb_interface *intf, unsigned char type,
123 unsigned char id, void *buf, int size)
125 return usb_control_msg(interface_to_usbdev(intf),
126 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
128 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
130 intf->cur_altsetting->desc.bInterfaceNumber, buf,
134 /*---------------------*/
135 /* driver registration */
136 /*---------------------*/
137 /* table of devices that work with this driver */
138 static const struct usb_device_id iowarrior_ids[] = {
139 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
140 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
141 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
142 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
143 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
144 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24SAG)},
145 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56AM)},
146 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW28)},
147 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW28L)},
148 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW100)},
149 {} /* Terminating entry */
151 MODULE_DEVICE_TABLE(usb, iowarrior_ids);
154 * USB callback handler for reading data
156 static void iowarrior_callback(struct urb *urb)
158 struct iowarrior *dev = urb->context;
163 int status = urb->status;
178 intr_idx = atomic_read(&dev->intr_idx);
179 /* aux_idx become previous intr_idx */
180 aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1);
181 read_idx = atomic_read(&dev->read_idx);
183 /* queue is not empty and it's interface 0 */
184 if ((intr_idx != read_idx)
185 && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) {
186 /* + 1 for serial number */
187 offset = aux_idx * (dev->report_size + 1);
189 (dev->read_queue + offset, urb->transfer_buffer,
191 /* equal values on interface 0 will be ignored */
196 /* aux_idx become next intr_idx */
197 aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1);
198 if (read_idx == aux_idx) {
199 /* queue full, dropping oldest input */
200 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx;
201 atomic_set(&dev->read_idx, read_idx);
202 atomic_set(&dev->overflow_flag, 1);
205 /* +1 for serial number */
206 offset = intr_idx * (dev->report_size + 1);
207 memcpy(dev->read_queue + offset, urb->transfer_buffer,
209 *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++;
211 atomic_set(&dev->intr_idx, aux_idx);
212 /* tell the blocking read about the new data */
213 wake_up_interruptible(&dev->read_wait);
216 retval = usb_submit_urb(urb, GFP_ATOMIC);
218 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n",
224 * USB Callback handler for write-ops
226 static void iowarrior_write_callback(struct urb *urb)
228 struct iowarrior *dev;
229 int status = urb->status;
232 /* sync/async unlink faults aren't errors */
234 !(status == -ENOENT ||
235 status == -ECONNRESET || status == -ESHUTDOWN)) {
236 dev_dbg(&dev->interface->dev,
237 "nonzero write bulk status received: %d\n", status);
239 /* free up our allocated buffer */
240 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
241 urb->transfer_buffer, urb->transfer_dma);
242 /* tell a waiting writer the interrupt-out-pipe is available again */
243 atomic_dec(&dev->write_busy);
244 wake_up_interruptible(&dev->write_wait);
250 static inline void iowarrior_delete(struct iowarrior *dev)
252 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
253 kfree(dev->int_in_buffer);
254 usb_free_urb(dev->int_in_urb);
255 kfree(dev->read_queue);
256 usb_put_intf(dev->interface);
260 /*---------------------*/
261 /* fops implementation */
262 /*---------------------*/
264 static int read_index(struct iowarrior *dev)
266 int intr_idx, read_idx;
268 read_idx = atomic_read(&dev->read_idx);
269 intr_idx = atomic_read(&dev->intr_idx);
271 return (read_idx == intr_idx ? -1 : read_idx);
277 static ssize_t iowarrior_read(struct file *file, char __user *buffer,
278 size_t count, loff_t *ppos)
280 struct iowarrior *dev;
284 dev = file->private_data;
286 /* verify that the device wasn't unplugged */
287 if (!dev || !dev->present)
290 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
293 /* read count must be packet size (+ time stamp) */
294 if ((count != dev->report_size)
295 && (count != (dev->report_size + 1)))
298 /* repeat until no buffer overrun in callback handler occur */
300 atomic_set(&dev->overflow_flag, 0);
301 if ((read_idx = read_index(dev)) == -1) {
303 if (file->f_flags & O_NONBLOCK)
306 //next line will return when there is either new data, or the device is unplugged
307 int r = wait_event_interruptible(dev->read_wait,
314 //we were interrupted by a signal
318 //The device was unplugged
321 if (read_idx == -1) {
322 // Can this happen ???
328 offset = read_idx * (dev->report_size + 1);
329 if (copy_to_user(buffer, dev->read_queue + offset, count)) {
332 } while (atomic_read(&dev->overflow_flag));
334 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
335 atomic_set(&dev->read_idx, read_idx);
342 static ssize_t iowarrior_write(struct file *file,
343 const char __user *user_buffer,
344 size_t count, loff_t *ppos)
346 struct iowarrior *dev;
348 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */
349 struct urb *int_out_urb = NULL;
351 dev = file->private_data;
353 mutex_lock(&dev->mutex);
354 /* verify that the device wasn't unplugged */
359 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
361 /* if count is 0 we're already done */
366 /* We only accept full reports */
367 if (count != dev->report_size) {
371 switch (dev->product_id) {
372 case USB_DEVICE_ID_CODEMERCS_IOW24:
373 case USB_DEVICE_ID_CODEMERCS_IOW24SAG:
374 case USB_DEVICE_ID_CODEMERCS_IOWPV1:
375 case USB_DEVICE_ID_CODEMERCS_IOWPV2:
376 case USB_DEVICE_ID_CODEMERCS_IOW40:
377 /* IOW24 and IOW40 use a synchronous call */
378 buf = memdup_user(user_buffer, count);
380 retval = PTR_ERR(buf);
383 retval = usb_set_report(dev->interface, 2, 0, buf, count);
387 case USB_DEVICE_ID_CODEMERCS_IOW56:
388 case USB_DEVICE_ID_CODEMERCS_IOW56AM:
389 case USB_DEVICE_ID_CODEMERCS_IOW28:
390 case USB_DEVICE_ID_CODEMERCS_IOW28L:
391 case USB_DEVICE_ID_CODEMERCS_IOW100:
392 /* The IOW56 uses asynchronous IO and more urbs */
393 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
394 /* Wait until we are below the limit for submitted urbs */
395 if (file->f_flags & O_NONBLOCK) {
399 retval = wait_event_interruptible(dev->write_wait,
400 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
402 /* we were interrupted by a signal */
407 /* The device was unplugged */
412 /* We were closed while waiting for an URB */
418 atomic_inc(&dev->write_busy);
419 int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
424 buf = usb_alloc_coherent(dev->udev, dev->report_size,
425 GFP_KERNEL, &int_out_urb->transfer_dma);
428 dev_dbg(&dev->interface->dev,
429 "Unable to allocate buffer\n");
430 goto error_no_buffer;
432 usb_fill_int_urb(int_out_urb, dev->udev,
433 usb_sndintpipe(dev->udev,
434 dev->int_out_endpoint->bEndpointAddress),
435 buf, dev->report_size,
436 iowarrior_write_callback, dev,
437 dev->int_out_endpoint->bInterval);
438 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
439 if (copy_from_user(buf, user_buffer, count)) {
443 usb_anchor_urb(int_out_urb, &dev->submitted);
444 retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
446 dev_dbg(&dev->interface->dev,
447 "submit error %d for urb nr.%d\n",
448 retval, atomic_read(&dev->write_busy));
449 usb_unanchor_urb(int_out_urb);
454 usb_free_urb(int_out_urb);
458 /* what do we have here ? An unsupported Product-ID ? */
459 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n",
460 __func__, dev->product_id);
466 usb_free_coherent(dev->udev, dev->report_size, buf,
467 int_out_urb->transfer_dma);
469 usb_free_urb(int_out_urb);
471 atomic_dec(&dev->write_busy);
472 wake_up_interruptible(&dev->write_wait);
474 mutex_unlock(&dev->mutex);
481 static long iowarrior_ioctl(struct file *file, unsigned int cmd,
484 struct iowarrior *dev = NULL;
486 __u8 __user *user_buffer;
488 int io_res; /* checks for bytes read/written and copy_to/from_user results */
490 dev = file->private_data;
494 buffer = kzalloc(dev->report_size, GFP_KERNEL);
498 mutex_lock(&dev->mutex);
500 /* verify that the device wasn't unplugged */
506 dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n",
507 dev->minor, cmd, arg);
513 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
514 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24SAG ||
515 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
516 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
517 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
518 user_buffer = (__u8 __user *)arg;
519 io_res = copy_from_user(buffer, user_buffer,
524 io_res = usb_set_report(dev->interface, 2, 0,
532 dev_err(&dev->interface->dev,
533 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n",
538 user_buffer = (__u8 __user *)arg;
539 io_res = usb_get_report(dev->udev,
540 dev->interface->cur_altsetting, 1, 0,
541 buffer, dev->report_size);
545 io_res = copy_to_user(user_buffer, buffer, dev->report_size);
552 /* Report available information for the device */
553 struct iowarrior_info info;
554 /* needed for power consumption */
555 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
557 memset(&info, 0, sizeof(info));
558 /* directly from the descriptor */
559 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
560 info.product = dev->product_id;
561 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
563 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
564 info.speed = dev->udev->speed;
565 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
566 info.report_size = dev->report_size;
568 /* serial number string has been read earlier 8 chars or empty string */
569 memcpy(info.serial, dev->chip_serial,
570 sizeof(dev->chip_serial));
571 if (cfg_descriptor == NULL) {
572 info.power = -1; /* no information available */
574 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
575 info.power = cfg_descriptor->bMaxPower * 2;
577 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
578 sizeof(struct iowarrior_info));
584 /* return that we did not understand this ioctl call */
589 /* unlock the device */
590 mutex_unlock(&dev->mutex);
598 static int iowarrior_open(struct inode *inode, struct file *file)
600 struct iowarrior *dev = NULL;
601 struct usb_interface *interface;
605 subminor = iminor(inode);
607 interface = usb_find_interface(&iowarrior_driver, subminor);
609 pr_err("%s - error, can't find device for minor %d\n",
614 dev = usb_get_intfdata(interface);
618 mutex_lock(&dev->mutex);
620 /* Only one process can open each device, no sharing. */
626 /* setup interrupt handler for receiving values */
627 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
628 dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
632 /* increment our usage count for the driver */
634 /* save our object in the file's private structure */
635 file->private_data = dev;
639 mutex_unlock(&dev->mutex);
646 static int iowarrior_release(struct inode *inode, struct file *file)
648 struct iowarrior *dev;
651 dev = file->private_data;
655 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
657 /* lock our device */
658 mutex_lock(&dev->mutex);
660 if (dev->opened <= 0) {
661 retval = -ENODEV; /* close called more than once */
662 mutex_unlock(&dev->mutex);
664 dev->opened = 0; /* we're closing now */
668 The device is still connected so we only shutdown
669 pending read-/write-ops.
671 usb_kill_urb(dev->int_in_urb);
672 wake_up_interruptible(&dev->read_wait);
673 wake_up_interruptible(&dev->write_wait);
674 mutex_unlock(&dev->mutex);
676 /* The device was unplugged, cleanup resources */
677 mutex_unlock(&dev->mutex);
678 iowarrior_delete(dev);
684 static __poll_t iowarrior_poll(struct file *file, poll_table * wait)
686 struct iowarrior *dev = file->private_data;
690 return EPOLLERR | EPOLLHUP;
692 poll_wait(file, &dev->read_wait, wait);
693 poll_wait(file, &dev->write_wait, wait);
696 return EPOLLERR | EPOLLHUP;
698 if (read_index(dev) != -1)
699 mask |= EPOLLIN | EPOLLRDNORM;
701 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
702 mask |= EPOLLOUT | EPOLLWRNORM;
707 * File operations needed when we register this driver.
708 * This assumes that this driver NEEDS file operations,
709 * of course, which means that the driver is expected
710 * to have a node in the /dev directory. If the USB
711 * device were for a network interface then the driver
712 * would use "struct net_driver" instead, and a serial
713 * device would use "struct tty_driver".
715 static const struct file_operations iowarrior_fops = {
716 .owner = THIS_MODULE,
717 .write = iowarrior_write,
718 .read = iowarrior_read,
719 .unlocked_ioctl = iowarrior_ioctl,
720 .open = iowarrior_open,
721 .release = iowarrior_release,
722 .poll = iowarrior_poll,
723 .llseek = noop_llseek,
726 static char *iowarrior_devnode(struct device *dev, umode_t *mode)
728 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
732 * usb class driver info in order to get a minor number from the usb core,
733 * and to have the device registered with devfs and the driver core
735 static struct usb_class_driver iowarrior_class = {
736 .name = "iowarrior%d",
737 .devnode = iowarrior_devnode,
738 .fops = &iowarrior_fops,
739 .minor_base = IOWARRIOR_MINOR_BASE,
742 /*---------------------------------*/
743 /* probe and disconnect functions */
744 /*---------------------------------*/
748 * Called by the usb core when a new device is connected that it thinks
749 * this driver might be interested in.
751 static int iowarrior_probe(struct usb_interface *interface,
752 const struct usb_device_id *id)
754 struct usb_device *udev = interface_to_usbdev(interface);
755 struct iowarrior *dev = NULL;
756 struct usb_host_interface *iface_desc;
757 int retval = -ENOMEM;
760 /* allocate memory for our device state and initialize it */
761 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
765 mutex_init(&dev->mutex);
767 atomic_set(&dev->intr_idx, 0);
768 atomic_set(&dev->read_idx, 0);
769 atomic_set(&dev->overflow_flag, 0);
770 init_waitqueue_head(&dev->read_wait);
771 atomic_set(&dev->write_busy, 0);
772 init_waitqueue_head(&dev->write_wait);
775 dev->interface = usb_get_intf(interface);
777 iface_desc = interface->cur_altsetting;
778 dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
780 init_usb_anchor(&dev->submitted);
782 res = usb_find_last_int_in_endpoint(iface_desc, &dev->int_in_endpoint);
784 dev_err(&interface->dev, "no interrupt-in endpoint found\n");
789 if ((dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) ||
790 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56AM) ||
791 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28) ||
792 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28L) ||
793 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW100)) {
794 res = usb_find_last_int_out_endpoint(iface_desc,
795 &dev->int_out_endpoint);
797 dev_err(&interface->dev, "no interrupt-out endpoint found\n");
803 /* we have to check the report_size often, so remember it in the endianness suitable for our machine */
804 dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
805 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
806 ((dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) ||
807 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56AM) ||
808 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28) ||
809 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28L) ||
810 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW100)))
811 /* IOWarrior56 has wMaxPacketSize different from report size */
812 dev->report_size = 7;
814 /* create the urb and buffer for reading */
815 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
816 if (!dev->int_in_urb)
818 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
819 if (!dev->int_in_buffer)
821 usb_fill_int_urb(dev->int_in_urb, dev->udev,
822 usb_rcvintpipe(dev->udev,
823 dev->int_in_endpoint->bEndpointAddress),
824 dev->int_in_buffer, dev->report_size,
825 iowarrior_callback, dev,
826 dev->int_in_endpoint->bInterval);
827 /* create an internal buffer for interrupt data from the device */
829 kmalloc_array(dev->report_size + 1, MAX_INTERRUPT_BUFFER,
831 if (!dev->read_queue)
833 /* Get the serial-number of the chip */
834 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
835 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
836 sizeof(dev->chip_serial));
837 if (strlen(dev->chip_serial) != 8)
838 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
840 /* Set the idle timeout to 0, if this is interface 0 */
841 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
842 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
844 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
845 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
847 /* allow device read and ioctl */
850 /* we can register the device now, as it is ready */
851 usb_set_intfdata(interface, dev);
853 retval = usb_register_dev(interface, &iowarrior_class);
855 /* something prevented us from registering this driver */
856 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
860 dev->minor = interface->minor;
862 /* let the user know what node this device is now attached to */
863 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
864 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
865 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
869 iowarrior_delete(dev);
874 * iowarrior_disconnect
876 * Called by the usb core when the device is removed from the system.
878 static void iowarrior_disconnect(struct usb_interface *interface)
880 struct iowarrior *dev = usb_get_intfdata(interface);
881 int minor = dev->minor;
883 usb_deregister_dev(interface, &iowarrior_class);
885 mutex_lock(&dev->mutex);
887 /* prevent device read, write and ioctl */
891 /* There is a process that holds a filedescriptor to the device ,
892 so we only shutdown read-/write-ops going on.
893 Deleting the device is postponed until close() was called.
895 usb_kill_urb(dev->int_in_urb);
896 usb_kill_anchored_urbs(&dev->submitted);
897 wake_up_interruptible(&dev->read_wait);
898 wake_up_interruptible(&dev->write_wait);
899 mutex_unlock(&dev->mutex);
901 /* no process is using the device, cleanup now */
902 mutex_unlock(&dev->mutex);
903 iowarrior_delete(dev);
906 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
907 minor - IOWARRIOR_MINOR_BASE);
910 /* usb specific object needed to register this driver with the usb subsystem */
911 static struct usb_driver iowarrior_driver = {
913 .probe = iowarrior_probe,
914 .disconnect = iowarrior_disconnect,
915 .id_table = iowarrior_ids,
918 module_usb_driver(iowarrior_driver);