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Merge tag 'platform-drivers-x86-v4.16-6' of git://git.infradead.org/linux-platform...
[linux.git] / drivers / bluetooth / hci_bcm.c
1 /*
2  *
3  *  Bluetooth HCI UART driver for Broadcom devices
4  *
5  *  Copyright (C) 2015  Intel Corporation
6  *
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  *
22  */
23
24 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/skbuff.h>
27 #include <linux/firmware.h>
28 #include <linux/module.h>
29 #include <linux/acpi.h>
30 #include <linux/of.h>
31 #include <linux/property.h>
32 #include <linux/platform_data/x86/apple.h>
33 #include <linux/platform_device.h>
34 #include <linux/clk.h>
35 #include <linux/gpio/consumer.h>
36 #include <linux/tty.h>
37 #include <linux/interrupt.h>
38 #include <linux/dmi.h>
39 #include <linux/pm_runtime.h>
40 #include <linux/serdev.h>
41
42 #include <net/bluetooth/bluetooth.h>
43 #include <net/bluetooth/hci_core.h>
44
45 #include "btbcm.h"
46 #include "hci_uart.h"
47
48 #define BCM_NULL_PKT 0x00
49 #define BCM_NULL_SIZE 0
50
51 #define BCM_LM_DIAG_PKT 0x07
52 #define BCM_LM_DIAG_SIZE 63
53
54 #define BCM_AUTOSUSPEND_DELAY   5000 /* default autosleep delay */
55
56 /**
57  * struct bcm_device - device driver resources
58  * @serdev_hu: HCI UART controller struct
59  * @list: bcm_device_list node
60  * @dev: physical UART slave
61  * @name: device name logged by bt_dev_*() functions
62  * @device_wakeup: BT_WAKE pin,
63  *      assert = Bluetooth device must wake up or remain awake,
64  *      deassert = Bluetooth device may sleep when sleep criteria are met
65  * @shutdown: BT_REG_ON pin,
66  *      power up or power down Bluetooth device internal regulators
67  * @set_device_wakeup: callback to toggle BT_WAKE pin
68  *      either by accessing @device_wakeup or by calling @btlp
69  * @set_shutdown: callback to toggle BT_REG_ON pin
70  *      either by accessing @shutdown or by calling @btpu/@btpd
71  * @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power")
72  * @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up")
73  * @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down")
74  * @clk: clock used by Bluetooth device
75  * @clk_enabled: whether @clk is prepared and enabled
76  * @init_speed: default baudrate of Bluetooth device;
77  *      the host UART is initially set to this baudrate so that
78  *      it can configure the Bluetooth device for @oper_speed
79  * @oper_speed: preferred baudrate of Bluetooth device;
80  *      set to 0 if @init_speed is already the preferred baudrate
81  * @irq: interrupt triggered by HOST_WAKE_BT pin
82  * @irq_active_low: whether @irq is active low
83  * @hu: pointer to HCI UART controller struct,
84  *      used to disable flow control during runtime suspend and system sleep
85  * @is_suspended: whether flow control is currently disabled
86  */
87 struct bcm_device {
88         /* Must be the first member, hci_serdev.c expects this. */
89         struct hci_uart         serdev_hu;
90         struct list_head        list;
91
92         struct device           *dev;
93
94         const char              *name;
95         struct gpio_desc        *device_wakeup;
96         struct gpio_desc        *shutdown;
97         int                     (*set_device_wakeup)(struct bcm_device *, bool);
98         int                     (*set_shutdown)(struct bcm_device *, bool);
99 #ifdef CONFIG_ACPI
100         acpi_handle             btlp, btpu, btpd;
101 #endif
102
103         struct clk              *clk;
104         bool                    clk_enabled;
105
106         u32                     init_speed;
107         u32                     oper_speed;
108         int                     irq;
109         bool                    irq_active_low;
110
111 #ifdef CONFIG_PM
112         struct hci_uart         *hu;
113         bool                    is_suspended;
114 #endif
115 };
116
117 /* generic bcm uart resources */
118 struct bcm_data {
119         struct sk_buff          *rx_skb;
120         struct sk_buff_head     txq;
121
122         struct bcm_device       *dev;
123 };
124
125 /* List of BCM BT UART devices */
126 static DEFINE_MUTEX(bcm_device_lock);
127 static LIST_HEAD(bcm_device_list);
128
129 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
130 {
131         if (hu->serdev)
132                 serdev_device_set_baudrate(hu->serdev, speed);
133         else
134                 hci_uart_set_baudrate(hu, speed);
135 }
136
137 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
138 {
139         struct hci_dev *hdev = hu->hdev;
140         struct sk_buff *skb;
141         struct bcm_update_uart_baud_rate param;
142
143         if (speed > 3000000) {
144                 struct bcm_write_uart_clock_setting clock;
145
146                 clock.type = BCM_UART_CLOCK_48MHZ;
147
148                 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
149
150                 /* This Broadcom specific command changes the UART's controller
151                  * clock for baud rate > 3000000.
152                  */
153                 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
154                 if (IS_ERR(skb)) {
155                         int err = PTR_ERR(skb);
156                         bt_dev_err(hdev, "BCM: failed to write clock (%d)",
157                                    err);
158                         return err;
159                 }
160
161                 kfree_skb(skb);
162         }
163
164         bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
165
166         param.zero = cpu_to_le16(0);
167         param.baud_rate = cpu_to_le32(speed);
168
169         /* This Broadcom specific command changes the UART's controller baud
170          * rate.
171          */
172         skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
173                              HCI_INIT_TIMEOUT);
174         if (IS_ERR(skb)) {
175                 int err = PTR_ERR(skb);
176                 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
177                            err);
178                 return err;
179         }
180
181         kfree_skb(skb);
182
183         return 0;
184 }
185
186 /* bcm_device_exists should be protected by bcm_device_lock */
187 static bool bcm_device_exists(struct bcm_device *device)
188 {
189         struct list_head *p;
190
191 #ifdef CONFIG_PM
192         /* Devices using serdev always exist */
193         if (device && device->hu && device->hu->serdev)
194                 return true;
195 #endif
196
197         list_for_each(p, &bcm_device_list) {
198                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
199
200                 if (device == dev)
201                         return true;
202         }
203
204         return false;
205 }
206
207 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
208 {
209         int err;
210
211         if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled) {
212                 err = clk_prepare_enable(dev->clk);
213                 if (err)
214                         return err;
215         }
216
217         err = dev->set_shutdown(dev, powered);
218         if (err)
219                 goto err_clk_disable;
220
221         err = dev->set_device_wakeup(dev, powered);
222         if (err)
223                 goto err_revert_shutdown;
224
225         if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
226                 clk_disable_unprepare(dev->clk);
227
228         dev->clk_enabled = powered;
229
230         return 0;
231
232 err_revert_shutdown:
233         dev->set_shutdown(dev, !powered);
234 err_clk_disable:
235         if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
236                 clk_disable_unprepare(dev->clk);
237         return err;
238 }
239
240 #ifdef CONFIG_PM
241 static irqreturn_t bcm_host_wake(int irq, void *data)
242 {
243         struct bcm_device *bdev = data;
244
245         bt_dev_dbg(bdev, "Host wake IRQ");
246
247         pm_request_resume(bdev->dev);
248
249         return IRQ_HANDLED;
250 }
251
252 static int bcm_request_irq(struct bcm_data *bcm)
253 {
254         struct bcm_device *bdev = bcm->dev;
255         int err;
256
257         mutex_lock(&bcm_device_lock);
258         if (!bcm_device_exists(bdev)) {
259                 err = -ENODEV;
260                 goto unlock;
261         }
262
263         if (bdev->irq <= 0) {
264                 err = -EOPNOTSUPP;
265                 goto unlock;
266         }
267
268         err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake,
269                                bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
270                                                       IRQF_TRIGGER_RISING,
271                                "host_wake", bdev);
272         if (err) {
273                 bdev->irq = err;
274                 goto unlock;
275         }
276
277         device_init_wakeup(bdev->dev, true);
278
279         pm_runtime_set_autosuspend_delay(bdev->dev,
280                                          BCM_AUTOSUSPEND_DELAY);
281         pm_runtime_use_autosuspend(bdev->dev);
282         pm_runtime_set_active(bdev->dev);
283         pm_runtime_enable(bdev->dev);
284
285 unlock:
286         mutex_unlock(&bcm_device_lock);
287
288         return err;
289 }
290
291 static const struct bcm_set_sleep_mode default_sleep_params = {
292         .sleep_mode = 1,        /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
293         .idle_host = 2,         /* idle threshold HOST, in 300ms */
294         .idle_dev = 2,          /* idle threshold device, in 300ms */
295         .bt_wake_active = 1,    /* BT_WAKE active mode: 1 = high, 0 = low */
296         .host_wake_active = 0,  /* HOST_WAKE active mode: 1 = high, 0 = low */
297         .allow_host_sleep = 1,  /* Allow host sleep in SCO flag */
298         .combine_modes = 1,     /* Combine sleep and LPM flag */
299         .tristate_control = 0,  /* Allow tri-state control of UART tx flag */
300         /* Irrelevant USB flags */
301         .usb_auto_sleep = 0,
302         .usb_resume_timeout = 0,
303         .break_to_host = 0,
304         .pulsed_host_wake = 0,
305 };
306
307 static int bcm_setup_sleep(struct hci_uart *hu)
308 {
309         struct bcm_data *bcm = hu->priv;
310         struct sk_buff *skb;
311         struct bcm_set_sleep_mode sleep_params = default_sleep_params;
312
313         sleep_params.host_wake_active = !bcm->dev->irq_active_low;
314
315         skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
316                              &sleep_params, HCI_INIT_TIMEOUT);
317         if (IS_ERR(skb)) {
318                 int err = PTR_ERR(skb);
319                 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
320                 return err;
321         }
322         kfree_skb(skb);
323
324         bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
325
326         return 0;
327 }
328 #else
329 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
330 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
331 #endif
332
333 static int bcm_set_diag(struct hci_dev *hdev, bool enable)
334 {
335         struct hci_uart *hu = hci_get_drvdata(hdev);
336         struct bcm_data *bcm = hu->priv;
337         struct sk_buff *skb;
338
339         if (!test_bit(HCI_RUNNING, &hdev->flags))
340                 return -ENETDOWN;
341
342         skb = bt_skb_alloc(3, GFP_KERNEL);
343         if (!skb)
344                 return -ENOMEM;
345
346         skb_put_u8(skb, BCM_LM_DIAG_PKT);
347         skb_put_u8(skb, 0xf0);
348         skb_put_u8(skb, enable);
349
350         skb_queue_tail(&bcm->txq, skb);
351         hci_uart_tx_wakeup(hu);
352
353         return 0;
354 }
355
356 static int bcm_open(struct hci_uart *hu)
357 {
358         struct bcm_data *bcm;
359         struct list_head *p;
360         int err;
361
362         bt_dev_dbg(hu->hdev, "hu %p", hu);
363
364         bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
365         if (!bcm)
366                 return -ENOMEM;
367
368         skb_queue_head_init(&bcm->txq);
369
370         hu->priv = bcm;
371
372         mutex_lock(&bcm_device_lock);
373
374         if (hu->serdev) {
375                 err = serdev_device_open(hu->serdev);
376                 if (err)
377                         goto err_free;
378
379                 bcm->dev = serdev_device_get_drvdata(hu->serdev);
380                 goto out;
381         }
382
383         if (!hu->tty->dev)
384                 goto out;
385
386         list_for_each(p, &bcm_device_list) {
387                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
388
389                 /* Retrieve saved bcm_device based on parent of the
390                  * platform device (saved during device probe) and
391                  * parent of tty device used by hci_uart
392                  */
393                 if (hu->tty->dev->parent == dev->dev->parent) {
394                         bcm->dev = dev;
395 #ifdef CONFIG_PM
396                         dev->hu = hu;
397 #endif
398                         break;
399                 }
400         }
401
402 out:
403         if (bcm->dev) {
404                 hu->init_speed = bcm->dev->init_speed;
405                 hu->oper_speed = bcm->dev->oper_speed;
406                 err = bcm_gpio_set_power(bcm->dev, true);
407                 if (err)
408                         goto err_unset_hu;
409         }
410
411         mutex_unlock(&bcm_device_lock);
412         return 0;
413
414 err_unset_hu:
415         if (hu->serdev)
416                 serdev_device_close(hu->serdev);
417 #ifdef CONFIG_PM
418         else
419                 bcm->dev->hu = NULL;
420 #endif
421 err_free:
422         mutex_unlock(&bcm_device_lock);
423         hu->priv = NULL;
424         kfree(bcm);
425         return err;
426 }
427
428 static int bcm_close(struct hci_uart *hu)
429 {
430         struct bcm_data *bcm = hu->priv;
431         struct bcm_device *bdev = NULL;
432         int err;
433
434         bt_dev_dbg(hu->hdev, "hu %p", hu);
435
436         /* Protect bcm->dev against removal of the device or driver */
437         mutex_lock(&bcm_device_lock);
438
439         if (hu->serdev) {
440                 serdev_device_close(hu->serdev);
441                 bdev = serdev_device_get_drvdata(hu->serdev);
442         } else if (bcm_device_exists(bcm->dev)) {
443                 bdev = bcm->dev;
444 #ifdef CONFIG_PM
445                 bdev->hu = NULL;
446 #endif
447         }
448
449         if (bdev) {
450                 if (IS_ENABLED(CONFIG_PM) && bdev->irq > 0) {
451                         devm_free_irq(bdev->dev, bdev->irq, bdev);
452                         device_init_wakeup(bdev->dev, false);
453                         pm_runtime_disable(bdev->dev);
454                 }
455
456                 err = bcm_gpio_set_power(bdev, false);
457                 if (err)
458                         bt_dev_err(hu->hdev, "Failed to power down");
459                 else
460                         pm_runtime_set_suspended(bdev->dev);
461         }
462         mutex_unlock(&bcm_device_lock);
463
464         skb_queue_purge(&bcm->txq);
465         kfree_skb(bcm->rx_skb);
466         kfree(bcm);
467
468         hu->priv = NULL;
469         return 0;
470 }
471
472 static int bcm_flush(struct hci_uart *hu)
473 {
474         struct bcm_data *bcm = hu->priv;
475
476         bt_dev_dbg(hu->hdev, "hu %p", hu);
477
478         skb_queue_purge(&bcm->txq);
479
480         return 0;
481 }
482
483 static int bcm_setup(struct hci_uart *hu)
484 {
485         struct bcm_data *bcm = hu->priv;
486         char fw_name[64];
487         const struct firmware *fw;
488         unsigned int speed;
489         int err;
490
491         bt_dev_dbg(hu->hdev, "hu %p", hu);
492
493         hu->hdev->set_diag = bcm_set_diag;
494         hu->hdev->set_bdaddr = btbcm_set_bdaddr;
495
496         err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
497         if (err)
498                 return err;
499
500         err = request_firmware(&fw, fw_name, &hu->hdev->dev);
501         if (err < 0) {
502                 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
503                 return 0;
504         }
505
506         err = btbcm_patchram(hu->hdev, fw);
507         if (err) {
508                 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
509                 goto finalize;
510         }
511
512         /* Init speed if any */
513         if (hu->init_speed)
514                 speed = hu->init_speed;
515         else if (hu->proto->init_speed)
516                 speed = hu->proto->init_speed;
517         else
518                 speed = 0;
519
520         if (speed)
521                 host_set_baudrate(hu, speed);
522
523         /* Operational speed if any */
524         if (hu->oper_speed)
525                 speed = hu->oper_speed;
526         else if (hu->proto->oper_speed)
527                 speed = hu->proto->oper_speed;
528         else
529                 speed = 0;
530
531         if (speed) {
532                 err = bcm_set_baudrate(hu, speed);
533                 if (!err)
534                         host_set_baudrate(hu, speed);
535         }
536
537 finalize:
538         release_firmware(fw);
539
540         err = btbcm_finalize(hu->hdev);
541         if (err)
542                 return err;
543
544         if (!bcm_request_irq(bcm))
545                 err = bcm_setup_sleep(hu);
546
547         return err;
548 }
549
550 #define BCM_RECV_LM_DIAG \
551         .type = BCM_LM_DIAG_PKT, \
552         .hlen = BCM_LM_DIAG_SIZE, \
553         .loff = 0, \
554         .lsize = 0, \
555         .maxlen = BCM_LM_DIAG_SIZE
556
557 #define BCM_RECV_NULL \
558         .type = BCM_NULL_PKT, \
559         .hlen = BCM_NULL_SIZE, \
560         .loff = 0, \
561         .lsize = 0, \
562         .maxlen = BCM_NULL_SIZE
563
564 static const struct h4_recv_pkt bcm_recv_pkts[] = {
565         { H4_RECV_ACL,      .recv = hci_recv_frame },
566         { H4_RECV_SCO,      .recv = hci_recv_frame },
567         { H4_RECV_EVENT,    .recv = hci_recv_frame },
568         { BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
569         { BCM_RECV_NULL,    .recv = hci_recv_diag  },
570 };
571
572 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
573 {
574         struct bcm_data *bcm = hu->priv;
575
576         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
577                 return -EUNATCH;
578
579         bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
580                                   bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
581         if (IS_ERR(bcm->rx_skb)) {
582                 int err = PTR_ERR(bcm->rx_skb);
583                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
584                 bcm->rx_skb = NULL;
585                 return err;
586         } else if (!bcm->rx_skb) {
587                 /* Delay auto-suspend when receiving completed packet */
588                 mutex_lock(&bcm_device_lock);
589                 if (bcm->dev && bcm_device_exists(bcm->dev))
590                         pm_request_resume(bcm->dev->dev);
591                 mutex_unlock(&bcm_device_lock);
592         }
593
594         return count;
595 }
596
597 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
598 {
599         struct bcm_data *bcm = hu->priv;
600
601         bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
602
603         /* Prepend skb with frame type */
604         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
605         skb_queue_tail(&bcm->txq, skb);
606
607         return 0;
608 }
609
610 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
611 {
612         struct bcm_data *bcm = hu->priv;
613         struct sk_buff *skb = NULL;
614         struct bcm_device *bdev = NULL;
615
616         mutex_lock(&bcm_device_lock);
617
618         if (bcm_device_exists(bcm->dev)) {
619                 bdev = bcm->dev;
620                 pm_runtime_get_sync(bdev->dev);
621                 /* Shall be resumed here */
622         }
623
624         skb = skb_dequeue(&bcm->txq);
625
626         if (bdev) {
627                 pm_runtime_mark_last_busy(bdev->dev);
628                 pm_runtime_put_autosuspend(bdev->dev);
629         }
630
631         mutex_unlock(&bcm_device_lock);
632
633         return skb;
634 }
635
636 #ifdef CONFIG_PM
637 static int bcm_suspend_device(struct device *dev)
638 {
639         struct bcm_device *bdev = dev_get_drvdata(dev);
640         int err;
641
642         bt_dev_dbg(bdev, "");
643
644         if (!bdev->is_suspended && bdev->hu) {
645                 hci_uart_set_flow_control(bdev->hu, true);
646
647                 /* Once this returns, driver suspends BT via GPIO */
648                 bdev->is_suspended = true;
649         }
650
651         /* Suspend the device */
652         err = bdev->set_device_wakeup(bdev, false);
653         if (err) {
654                 if (bdev->is_suspended && bdev->hu) {
655                         bdev->is_suspended = false;
656                         hci_uart_set_flow_control(bdev->hu, false);
657                 }
658                 return -EBUSY;
659         }
660
661         bt_dev_dbg(bdev, "suspend, delaying 15 ms");
662         msleep(15);
663
664         return 0;
665 }
666
667 static int bcm_resume_device(struct device *dev)
668 {
669         struct bcm_device *bdev = dev_get_drvdata(dev);
670         int err;
671
672         bt_dev_dbg(bdev, "");
673
674         err = bdev->set_device_wakeup(bdev, true);
675         if (err) {
676                 dev_err(dev, "Failed to power up\n");
677                 return err;
678         }
679
680         bt_dev_dbg(bdev, "resume, delaying 15 ms");
681         msleep(15);
682
683         /* When this executes, the device has woken up already */
684         if (bdev->is_suspended && bdev->hu) {
685                 bdev->is_suspended = false;
686
687                 hci_uart_set_flow_control(bdev->hu, false);
688         }
689
690         return 0;
691 }
692 #endif
693
694 #ifdef CONFIG_PM_SLEEP
695 /* suspend callback */
696 static int bcm_suspend(struct device *dev)
697 {
698         struct bcm_device *bdev = dev_get_drvdata(dev);
699         int error;
700
701         bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
702
703         /*
704          * When used with a device instantiated as platform_device, bcm_suspend
705          * can be called at any time as long as the platform device is bound,
706          * so it should use bcm_device_lock to protect access to hci_uart
707          * and device_wake-up GPIO.
708          */
709         mutex_lock(&bcm_device_lock);
710
711         if (!bdev->hu)
712                 goto unlock;
713
714         if (pm_runtime_active(dev))
715                 bcm_suspend_device(dev);
716
717         if (device_may_wakeup(dev) && bdev->irq > 0) {
718                 error = enable_irq_wake(bdev->irq);
719                 if (!error)
720                         bt_dev_dbg(bdev, "BCM irq: enabled");
721         }
722
723 unlock:
724         mutex_unlock(&bcm_device_lock);
725
726         return 0;
727 }
728
729 /* resume callback */
730 static int bcm_resume(struct device *dev)
731 {
732         struct bcm_device *bdev = dev_get_drvdata(dev);
733         int err = 0;
734
735         bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
736
737         /*
738          * When used with a device instantiated as platform_device, bcm_resume
739          * can be called at any time as long as platform device is bound,
740          * so it should use bcm_device_lock to protect access to hci_uart
741          * and device_wake-up GPIO.
742          */
743         mutex_lock(&bcm_device_lock);
744
745         if (!bdev->hu)
746                 goto unlock;
747
748         if (device_may_wakeup(dev) && bdev->irq > 0) {
749                 disable_irq_wake(bdev->irq);
750                 bt_dev_dbg(bdev, "BCM irq: disabled");
751         }
752
753         err = bcm_resume_device(dev);
754
755 unlock:
756         mutex_unlock(&bcm_device_lock);
757
758         if (!err) {
759                 pm_runtime_disable(dev);
760                 pm_runtime_set_active(dev);
761                 pm_runtime_enable(dev);
762         }
763
764         return 0;
765 }
766 #endif
767
768 static const struct acpi_gpio_params int_last_device_wakeup_gpios = { 0, 0, false };
769 static const struct acpi_gpio_params int_last_shutdown_gpios = { 1, 0, false };
770 static const struct acpi_gpio_params int_last_host_wakeup_gpios = { 2, 0, false };
771
772 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
773         { "device-wakeup-gpios", &int_last_device_wakeup_gpios, 1 },
774         { "shutdown-gpios", &int_last_shutdown_gpios, 1 },
775         { "host-wakeup-gpios", &int_last_host_wakeup_gpios, 1 },
776         { },
777 };
778
779 static const struct acpi_gpio_params int_first_host_wakeup_gpios = { 0, 0, false };
780 static const struct acpi_gpio_params int_first_device_wakeup_gpios = { 1, 0, false };
781 static const struct acpi_gpio_params int_first_shutdown_gpios = { 2, 0, false };
782
783 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
784         { "device-wakeup-gpios", &int_first_device_wakeup_gpios, 1 },
785         { "shutdown-gpios", &int_first_shutdown_gpios, 1 },
786         { "host-wakeup-gpios", &int_first_host_wakeup_gpios, 1 },
787         { },
788 };
789
790 #ifdef CONFIG_ACPI
791 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
792 static const struct dmi_system_id bcm_active_low_irq_dmi_table[] = {
793         {
794                 .ident = "Asus T100TA",
795                 .matches = {
796                         DMI_EXACT_MATCH(DMI_SYS_VENDOR,
797                                         "ASUSTeK COMPUTER INC."),
798                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
799                 },
800         },
801         {
802                 .ident = "Asus T100CHI",
803                 .matches = {
804                         DMI_EXACT_MATCH(DMI_SYS_VENDOR,
805                                         "ASUSTeK COMPUTER INC."),
806                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"),
807                 },
808         },
809         {       /* Handle ThinkPad 8 tablets with BCM2E55 chipset ACPI ID */
810                 .ident = "Lenovo ThinkPad 8",
811                 .matches = {
812                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
813                         DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "ThinkPad 8"),
814                 },
815         },
816         {
817                 .ident = "MINIX Z83-4",
818                 .matches = {
819                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "MINIX"),
820                         DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
821                 },
822         },
823         { }
824 };
825
826 static int bcm_resource(struct acpi_resource *ares, void *data)
827 {
828         struct bcm_device *dev = data;
829         struct acpi_resource_extended_irq *irq;
830         struct acpi_resource_gpio *gpio;
831         struct acpi_resource_uart_serialbus *sb;
832
833         switch (ares->type) {
834         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
835                 irq = &ares->data.extended_irq;
836                 dev->irq_active_low = irq->polarity == ACPI_ACTIVE_LOW;
837                 break;
838
839         case ACPI_RESOURCE_TYPE_GPIO:
840                 gpio = &ares->data.gpio;
841                 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
842                         dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
843                 break;
844
845         case ACPI_RESOURCE_TYPE_SERIAL_BUS:
846                 sb = &ares->data.uart_serial_bus;
847                 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
848                         dev->init_speed = sb->default_baud_rate;
849                         dev->oper_speed = 4000000;
850                 }
851                 break;
852
853         default:
854                 break;
855         }
856
857         return 0;
858 }
859
860 static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
861 {
862         if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
863                 return -EIO;
864
865         return 0;
866 }
867
868 static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
869 {
870         if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
871                                               NULL, NULL, NULL)))
872                 return -EIO;
873
874         return 0;
875 }
876
877 static int bcm_apple_get_resources(struct bcm_device *dev)
878 {
879         struct acpi_device *adev = ACPI_COMPANION(dev->dev);
880         const union acpi_object *obj;
881
882         if (!adev ||
883             ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
884             ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
885             ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
886                 return -ENODEV;
887
888         if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
889             obj->buffer.length == 8)
890                 dev->init_speed = *(u64 *)obj->buffer.pointer;
891
892         dev->set_device_wakeup = bcm_apple_set_device_wakeup;
893         dev->set_shutdown = bcm_apple_set_shutdown;
894
895         return 0;
896 }
897 #else
898 static inline int bcm_apple_get_resources(struct bcm_device *dev)
899 {
900         return -EOPNOTSUPP;
901 }
902 #endif /* CONFIG_ACPI */
903
904 static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
905 {
906         gpiod_set_value(dev->device_wakeup, awake);
907         return 0;
908 }
909
910 static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
911 {
912         gpiod_set_value(dev->shutdown, powered);
913         return 0;
914 }
915
916 static int bcm_get_resources(struct bcm_device *dev)
917 {
918         dev->name = dev_name(dev->dev);
919
920         if (x86_apple_machine && !bcm_apple_get_resources(dev))
921                 return 0;
922
923         dev->clk = devm_clk_get(dev->dev, NULL);
924
925         dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
926                                                      GPIOD_OUT_LOW);
927         if (IS_ERR(dev->device_wakeup))
928                 return PTR_ERR(dev->device_wakeup);
929
930         dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
931                                                 GPIOD_OUT_LOW);
932         if (IS_ERR(dev->shutdown))
933                 return PTR_ERR(dev->shutdown);
934
935         dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
936         dev->set_shutdown = bcm_gpio_set_shutdown;
937
938         /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
939         if (dev->irq <= 0) {
940                 struct gpio_desc *gpio;
941
942                 gpio = devm_gpiod_get_optional(dev->dev, "host-wakeup",
943                                                GPIOD_IN);
944                 if (IS_ERR(gpio))
945                         return PTR_ERR(gpio);
946
947                 dev->irq = gpiod_to_irq(gpio);
948         }
949
950         dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
951         return 0;
952 }
953
954 #ifdef CONFIG_ACPI
955 static int bcm_acpi_probe(struct bcm_device *dev)
956 {
957         LIST_HEAD(resources);
958         const struct dmi_system_id *dmi_id;
959         const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
960         const struct acpi_device_id *id;
961         struct resource_entry *entry;
962         int ret;
963
964         /* Retrieve GPIO data */
965         id = acpi_match_device(dev->dev->driver->acpi_match_table, dev->dev);
966         if (id)
967                 gpio_mapping = (const struct acpi_gpio_mapping *) id->driver_data;
968
969         ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
970         if (ret)
971                 return ret;
972
973         /* Retrieve UART ACPI info */
974         ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
975                                      &resources, bcm_resource, dev);
976         if (ret < 0)
977                 return ret;
978
979         resource_list_for_each_entry(entry, &resources) {
980                 if (resource_type(entry->res) == IORESOURCE_IRQ) {
981                         dev->irq = entry->res->start;
982                         break;
983                 }
984         }
985         acpi_dev_free_resource_list(&resources);
986
987         dmi_id = dmi_first_match(bcm_active_low_irq_dmi_table);
988         if (dmi_id) {
989                 dev_warn(dev->dev, "%s: Overwriting IRQ polarity to active low",
990                             dmi_id->ident);
991                 dev->irq_active_low = true;
992         }
993
994         return 0;
995 }
996 #else
997 static int bcm_acpi_probe(struct bcm_device *dev)
998 {
999         return -EINVAL;
1000 }
1001 #endif /* CONFIG_ACPI */
1002
1003 static int bcm_of_probe(struct bcm_device *bdev)
1004 {
1005         device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
1006         return 0;
1007 }
1008
1009 static int bcm_probe(struct platform_device *pdev)
1010 {
1011         struct bcm_device *dev;
1012         int ret;
1013
1014         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1015         if (!dev)
1016                 return -ENOMEM;
1017
1018         dev->dev = &pdev->dev;
1019         dev->irq = platform_get_irq(pdev, 0);
1020
1021         if (has_acpi_companion(&pdev->dev)) {
1022                 ret = bcm_acpi_probe(dev);
1023                 if (ret)
1024                         return ret;
1025         }
1026
1027         ret = bcm_get_resources(dev);
1028         if (ret)
1029                 return ret;
1030
1031         platform_set_drvdata(pdev, dev);
1032
1033         dev_info(&pdev->dev, "%s device registered.\n", dev->name);
1034
1035         /* Place this instance on the device list */
1036         mutex_lock(&bcm_device_lock);
1037         list_add_tail(&dev->list, &bcm_device_list);
1038         mutex_unlock(&bcm_device_lock);
1039
1040         ret = bcm_gpio_set_power(dev, false);
1041         if (ret)
1042                 dev_err(&pdev->dev, "Failed to power down\n");
1043
1044         return 0;
1045 }
1046
1047 static int bcm_remove(struct platform_device *pdev)
1048 {
1049         struct bcm_device *dev = platform_get_drvdata(pdev);
1050
1051         mutex_lock(&bcm_device_lock);
1052         list_del(&dev->list);
1053         mutex_unlock(&bcm_device_lock);
1054
1055         dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
1056
1057         return 0;
1058 }
1059
1060 static const struct hci_uart_proto bcm_proto = {
1061         .id             = HCI_UART_BCM,
1062         .name           = "Broadcom",
1063         .manufacturer   = 15,
1064         .init_speed     = 115200,
1065         .open           = bcm_open,
1066         .close          = bcm_close,
1067         .flush          = bcm_flush,
1068         .setup          = bcm_setup,
1069         .set_baudrate   = bcm_set_baudrate,
1070         .recv           = bcm_recv,
1071         .enqueue        = bcm_enqueue,
1072         .dequeue        = bcm_dequeue,
1073 };
1074
1075 #ifdef CONFIG_ACPI
1076 static const struct acpi_device_id bcm_acpi_match[] = {
1077         { "BCM2E1A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1078         { "BCM2E39", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1079         { "BCM2E3A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1080         { "BCM2E3D", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1081         { "BCM2E3F", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1082         { "BCM2E40", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1083         { "BCM2E54", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1084         { "BCM2E55", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1085         { "BCM2E64", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1086         { "BCM2E65", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1087         { "BCM2E67", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1088         { "BCM2E71", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1089         { "BCM2E72", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1090         { "BCM2E7B", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1091         { "BCM2E7C", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
1092         { "BCM2E7E", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
1093         { "BCM2E95", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
1094         { "BCM2E96", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
1095         { "BCM2EA4", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
1096         { },
1097 };
1098 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
1099 #endif
1100
1101 /* suspend and resume callbacks */
1102 static const struct dev_pm_ops bcm_pm_ops = {
1103         SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
1104         SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
1105 };
1106
1107 static struct platform_driver bcm_driver = {
1108         .probe = bcm_probe,
1109         .remove = bcm_remove,
1110         .driver = {
1111                 .name = "hci_bcm",
1112                 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1113                 .pm = &bcm_pm_ops,
1114         },
1115 };
1116
1117 static int bcm_serdev_probe(struct serdev_device *serdev)
1118 {
1119         struct bcm_device *bcmdev;
1120         int err;
1121
1122         bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
1123         if (!bcmdev)
1124                 return -ENOMEM;
1125
1126         bcmdev->dev = &serdev->dev;
1127 #ifdef CONFIG_PM
1128         bcmdev->hu = &bcmdev->serdev_hu;
1129 #endif
1130         bcmdev->serdev_hu.serdev = serdev;
1131         serdev_device_set_drvdata(serdev, bcmdev);
1132
1133         if (has_acpi_companion(&serdev->dev))
1134                 err = bcm_acpi_probe(bcmdev);
1135         else
1136                 err = bcm_of_probe(bcmdev);
1137         if (err)
1138                 return err;
1139
1140         err = bcm_get_resources(bcmdev);
1141         if (err)
1142                 return err;
1143
1144         err = bcm_gpio_set_power(bcmdev, false);
1145         if (err)
1146                 dev_err(&serdev->dev, "Failed to power down\n");
1147
1148         return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
1149 }
1150
1151 static void bcm_serdev_remove(struct serdev_device *serdev)
1152 {
1153         struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
1154
1155         hci_uart_unregister_device(&bcmdev->serdev_hu);
1156 }
1157
1158 #ifdef CONFIG_OF
1159 static const struct of_device_id bcm_bluetooth_of_match[] = {
1160         { .compatible = "brcm,bcm43438-bt" },
1161         { },
1162 };
1163 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
1164 #endif
1165
1166 static struct serdev_device_driver bcm_serdev_driver = {
1167         .probe = bcm_serdev_probe,
1168         .remove = bcm_serdev_remove,
1169         .driver = {
1170                 .name = "hci_uart_bcm",
1171                 .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
1172                 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1173                 .pm = &bcm_pm_ops,
1174         },
1175 };
1176
1177 int __init bcm_init(void)
1178 {
1179         /* For now, we need to keep both platform device
1180          * driver (ACPI generated) and serdev driver (DT).
1181          */
1182         platform_driver_register(&bcm_driver);
1183         serdev_device_driver_register(&bcm_serdev_driver);
1184
1185         return hci_uart_register_proto(&bcm_proto);
1186 }
1187
1188 int __exit bcm_deinit(void)
1189 {
1190         platform_driver_unregister(&bcm_driver);
1191         serdev_device_driver_unregister(&bcm_serdev_driver);
1192
1193         return hci_uart_unregister_proto(&bcm_proto);
1194 }