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[karo-tx-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/platform_device.h>
31 #include <linux/clk.h>
32 #include <linux/gpio/consumer.h>
33 #include <linux/tty.h>
34 #include <linux/interrupt.h>
35 #include <linux/dmi.h>
36 #include <linux/pm_runtime.h>
37
38 #include <net/bluetooth/bluetooth.h>
39 #include <net/bluetooth/hci_core.h>
40
41 #include "btbcm.h"
42 #include "hci_uart.h"
43
44 #define BCM_LM_DIAG_PKT 0x07
45 #define BCM_LM_DIAG_SIZE 63
46
47 #define BCM_AUTOSUSPEND_DELAY   5000 /* default autosleep delay */
48
49 struct bcm_device {
50         struct list_head        list;
51
52         struct platform_device  *pdev;
53
54         const char              *name;
55         struct gpio_desc        *device_wakeup;
56         struct gpio_desc        *shutdown;
57
58         struct clk              *clk;
59         bool                    clk_enabled;
60
61         u32                     init_speed;
62         int                     irq;
63         u8                      irq_polarity;
64
65 #ifdef CONFIG_PM
66         struct hci_uart         *hu;
67         bool                    is_suspended; /* suspend/resume flag */
68 #endif
69 };
70
71 struct bcm_data {
72         struct sk_buff          *rx_skb;
73         struct sk_buff_head     txq;
74
75         struct bcm_device       *dev;
76 };
77
78 /* List of BCM BT UART devices */
79 static DEFINE_MUTEX(bcm_device_lock);
80 static LIST_HEAD(bcm_device_list);
81
82 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
83 {
84         struct hci_dev *hdev = hu->hdev;
85         struct sk_buff *skb;
86         struct bcm_update_uart_baud_rate param;
87
88         if (speed > 3000000) {
89                 struct bcm_write_uart_clock_setting clock;
90
91                 clock.type = BCM_UART_CLOCK_48MHZ;
92
93                 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
94
95                 /* This Broadcom specific command changes the UART's controller
96                  * clock for baud rate > 3000000.
97                  */
98                 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
99                 if (IS_ERR(skb)) {
100                         int err = PTR_ERR(skb);
101                         bt_dev_err(hdev, "BCM: failed to write clock (%d)",
102                                    err);
103                         return err;
104                 }
105
106                 kfree_skb(skb);
107         }
108
109         bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
110
111         param.zero = cpu_to_le16(0);
112         param.baud_rate = cpu_to_le32(speed);
113
114         /* This Broadcom specific command changes the UART's controller baud
115          * rate.
116          */
117         skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
118                              HCI_INIT_TIMEOUT);
119         if (IS_ERR(skb)) {
120                 int err = PTR_ERR(skb);
121                 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
122                            err);
123                 return err;
124         }
125
126         kfree_skb(skb);
127
128         return 0;
129 }
130
131 /* bcm_device_exists should be protected by bcm_device_lock */
132 static bool bcm_device_exists(struct bcm_device *device)
133 {
134         struct list_head *p;
135
136         list_for_each(p, &bcm_device_list) {
137                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
138
139                 if (device == dev)
140                         return true;
141         }
142
143         return false;
144 }
145
146 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
147 {
148         if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
149                 clk_enable(dev->clk);
150
151         gpiod_set_value(dev->shutdown, powered);
152         gpiod_set_value(dev->device_wakeup, powered);
153
154         if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
155                 clk_disable(dev->clk);
156
157         dev->clk_enabled = powered;
158
159         return 0;
160 }
161
162 #ifdef CONFIG_PM
163 static irqreturn_t bcm_host_wake(int irq, void *data)
164 {
165         struct bcm_device *bdev = data;
166
167         bt_dev_dbg(bdev, "Host wake IRQ");
168
169         pm_runtime_get(&bdev->pdev->dev);
170         pm_runtime_mark_last_busy(&bdev->pdev->dev);
171         pm_runtime_put_autosuspend(&bdev->pdev->dev);
172
173         return IRQ_HANDLED;
174 }
175
176 static int bcm_request_irq(struct bcm_data *bcm)
177 {
178         struct bcm_device *bdev = bcm->dev;
179         int err = 0;
180
181         /* If this is not a platform device, do not enable PM functionalities */
182         mutex_lock(&bcm_device_lock);
183         if (!bcm_device_exists(bdev)) {
184                 err = -ENODEV;
185                 goto unlock;
186         }
187
188         if (bdev->irq > 0) {
189                 err = devm_request_irq(&bdev->pdev->dev, bdev->irq,
190                                        bcm_host_wake, IRQF_TRIGGER_RISING,
191                                        "host_wake", bdev);
192                 if (err)
193                         goto unlock;
194
195                 device_init_wakeup(&bdev->pdev->dev, true);
196
197                 pm_runtime_set_autosuspend_delay(&bdev->pdev->dev,
198                                                  BCM_AUTOSUSPEND_DELAY);
199                 pm_runtime_use_autosuspend(&bdev->pdev->dev);
200                 pm_runtime_set_active(&bdev->pdev->dev);
201                 pm_runtime_enable(&bdev->pdev->dev);
202         }
203
204 unlock:
205         mutex_unlock(&bcm_device_lock);
206
207         return err;
208 }
209
210 static const struct bcm_set_sleep_mode default_sleep_params = {
211         .sleep_mode = 1,        /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
212         .idle_host = 2,         /* idle threshold HOST, in 300ms */
213         .idle_dev = 2,          /* idle threshold device, in 300ms */
214         .bt_wake_active = 1,    /* BT_WAKE active mode: 1 = high, 0 = low */
215         .host_wake_active = 0,  /* HOST_WAKE active mode: 1 = high, 0 = low */
216         .allow_host_sleep = 1,  /* Allow host sleep in SCO flag */
217         .combine_modes = 1,     /* Combine sleep and LPM flag */
218         .tristate_control = 0,  /* Allow tri-state control of UART tx flag */
219         /* Irrelevant USB flags */
220         .usb_auto_sleep = 0,
221         .usb_resume_timeout = 0,
222         .pulsed_host_wake = 0,
223         .break_to_host = 0
224 };
225
226 static int bcm_setup_sleep(struct hci_uart *hu)
227 {
228         struct bcm_data *bcm = hu->priv;
229         struct sk_buff *skb;
230         struct bcm_set_sleep_mode sleep_params = default_sleep_params;
231
232         sleep_params.host_wake_active = !bcm->dev->irq_polarity;
233
234         skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
235                              &sleep_params, HCI_INIT_TIMEOUT);
236         if (IS_ERR(skb)) {
237                 int err = PTR_ERR(skb);
238                 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
239                 return err;
240         }
241         kfree_skb(skb);
242
243         bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
244
245         return 0;
246 }
247 #else
248 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
249 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
250 #endif
251
252 static int bcm_set_diag(struct hci_dev *hdev, bool enable)
253 {
254         struct hci_uart *hu = hci_get_drvdata(hdev);
255         struct bcm_data *bcm = hu->priv;
256         struct sk_buff *skb;
257
258         if (!test_bit(HCI_RUNNING, &hdev->flags))
259                 return -ENETDOWN;
260
261         skb = bt_skb_alloc(3, GFP_KERNEL);
262         if (!skb)
263                 return -ENOMEM;
264
265         *skb_put(skb, 1) = BCM_LM_DIAG_PKT;
266         *skb_put(skb, 1) = 0xf0;
267         *skb_put(skb, 1) = enable;
268
269         skb_queue_tail(&bcm->txq, skb);
270         hci_uart_tx_wakeup(hu);
271
272         return 0;
273 }
274
275 static int bcm_open(struct hci_uart *hu)
276 {
277         struct bcm_data *bcm;
278         struct list_head *p;
279
280         bt_dev_dbg(hu->hdev, "hu %p", hu);
281
282         bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
283         if (!bcm)
284                 return -ENOMEM;
285
286         skb_queue_head_init(&bcm->txq);
287
288         hu->priv = bcm;
289
290         mutex_lock(&bcm_device_lock);
291         list_for_each(p, &bcm_device_list) {
292                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
293
294                 /* Retrieve saved bcm_device based on parent of the
295                  * platform device (saved during device probe) and
296                  * parent of tty device used by hci_uart
297                  */
298                 if (hu->tty->dev->parent == dev->pdev->dev.parent) {
299                         bcm->dev = dev;
300                         hu->init_speed = dev->init_speed;
301 #ifdef CONFIG_PM
302                         dev->hu = hu;
303 #endif
304                         bcm_gpio_set_power(bcm->dev, true);
305                         break;
306                 }
307         }
308
309         mutex_unlock(&bcm_device_lock);
310
311         return 0;
312 }
313
314 static int bcm_close(struct hci_uart *hu)
315 {
316         struct bcm_data *bcm = hu->priv;
317         struct bcm_device *bdev = bcm->dev;
318
319         bt_dev_dbg(hu->hdev, "hu %p", hu);
320
321         /* Protect bcm->dev against removal of the device or driver */
322         mutex_lock(&bcm_device_lock);
323         if (bcm_device_exists(bdev)) {
324                 bcm_gpio_set_power(bdev, false);
325 #ifdef CONFIG_PM
326                 pm_runtime_disable(&bdev->pdev->dev);
327                 pm_runtime_set_suspended(&bdev->pdev->dev);
328
329                 if (device_can_wakeup(&bdev->pdev->dev)) {
330                         devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev);
331                         device_init_wakeup(&bdev->pdev->dev, false);
332                 }
333
334                 bdev->hu = NULL;
335 #endif
336         }
337         mutex_unlock(&bcm_device_lock);
338
339         skb_queue_purge(&bcm->txq);
340         kfree_skb(bcm->rx_skb);
341         kfree(bcm);
342
343         hu->priv = NULL;
344         return 0;
345 }
346
347 static int bcm_flush(struct hci_uart *hu)
348 {
349         struct bcm_data *bcm = hu->priv;
350
351         bt_dev_dbg(hu->hdev, "hu %p", hu);
352
353         skb_queue_purge(&bcm->txq);
354
355         return 0;
356 }
357
358 static int bcm_setup(struct hci_uart *hu)
359 {
360         struct bcm_data *bcm = hu->priv;
361         char fw_name[64];
362         const struct firmware *fw;
363         unsigned int speed;
364         int err;
365
366         bt_dev_dbg(hu->hdev, "hu %p", hu);
367
368         hu->hdev->set_diag = bcm_set_diag;
369         hu->hdev->set_bdaddr = btbcm_set_bdaddr;
370
371         err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
372         if (err)
373                 return err;
374
375         err = request_firmware(&fw, fw_name, &hu->hdev->dev);
376         if (err < 0) {
377                 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
378                 return 0;
379         }
380
381         err = btbcm_patchram(hu->hdev, fw);
382         if (err) {
383                 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
384                 goto finalize;
385         }
386
387         /* Init speed if any */
388         if (hu->init_speed)
389                 speed = hu->init_speed;
390         else if (hu->proto->init_speed)
391                 speed = hu->proto->init_speed;
392         else
393                 speed = 0;
394
395         if (speed)
396                 hci_uart_set_baudrate(hu, speed);
397
398         /* Operational speed if any */
399         if (hu->oper_speed)
400                 speed = hu->oper_speed;
401         else if (hu->proto->oper_speed)
402                 speed = hu->proto->oper_speed;
403         else
404                 speed = 0;
405
406         if (speed) {
407                 err = bcm_set_baudrate(hu, speed);
408                 if (!err)
409                         hci_uart_set_baudrate(hu, speed);
410         }
411
412 finalize:
413         release_firmware(fw);
414
415         err = btbcm_finalize(hu->hdev);
416         if (err)
417                 return err;
418
419         err = bcm_request_irq(bcm);
420         if (!err)
421                 err = bcm_setup_sleep(hu);
422
423         return err;
424 }
425
426 #define BCM_RECV_LM_DIAG \
427         .type = BCM_LM_DIAG_PKT, \
428         .hlen = BCM_LM_DIAG_SIZE, \
429         .loff = 0, \
430         .lsize = 0, \
431         .maxlen = BCM_LM_DIAG_SIZE
432
433 static const struct h4_recv_pkt bcm_recv_pkts[] = {
434         { H4_RECV_ACL,      .recv = hci_recv_frame },
435         { H4_RECV_SCO,      .recv = hci_recv_frame },
436         { H4_RECV_EVENT,    .recv = hci_recv_frame },
437         { BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
438 };
439
440 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
441 {
442         struct bcm_data *bcm = hu->priv;
443
444         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
445                 return -EUNATCH;
446
447         bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
448                                   bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
449         if (IS_ERR(bcm->rx_skb)) {
450                 int err = PTR_ERR(bcm->rx_skb);
451                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
452                 bcm->rx_skb = NULL;
453                 return err;
454         } else if (!bcm->rx_skb) {
455                 /* Delay auto-suspend when receiving completed packet */
456                 mutex_lock(&bcm_device_lock);
457                 if (bcm->dev && bcm_device_exists(bcm->dev)) {
458                         pm_runtime_get(&bcm->dev->pdev->dev);
459                         pm_runtime_mark_last_busy(&bcm->dev->pdev->dev);
460                         pm_runtime_put_autosuspend(&bcm->dev->pdev->dev);
461                 }
462                 mutex_unlock(&bcm_device_lock);
463         }
464
465         return count;
466 }
467
468 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
469 {
470         struct bcm_data *bcm = hu->priv;
471
472         bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
473
474         /* Prepend skb with frame type */
475         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
476         skb_queue_tail(&bcm->txq, skb);
477
478         return 0;
479 }
480
481 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
482 {
483         struct bcm_data *bcm = hu->priv;
484         struct sk_buff *skb = NULL;
485         struct bcm_device *bdev = NULL;
486
487         mutex_lock(&bcm_device_lock);
488
489         if (bcm_device_exists(bcm->dev)) {
490                 bdev = bcm->dev;
491                 pm_runtime_get_sync(&bdev->pdev->dev);
492                 /* Shall be resumed here */
493         }
494
495         skb = skb_dequeue(&bcm->txq);
496
497         if (bdev) {
498                 pm_runtime_mark_last_busy(&bdev->pdev->dev);
499                 pm_runtime_put_autosuspend(&bdev->pdev->dev);
500         }
501
502         mutex_unlock(&bcm_device_lock);
503
504         return skb;
505 }
506
507 #ifdef CONFIG_PM
508 static int bcm_suspend_device(struct device *dev)
509 {
510         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
511
512         bt_dev_dbg(bdev, "");
513
514         if (!bdev->is_suspended && bdev->hu) {
515                 hci_uart_set_flow_control(bdev->hu, true);
516
517                 /* Once this returns, driver suspends BT via GPIO */
518                 bdev->is_suspended = true;
519         }
520
521         /* Suspend the device */
522         if (bdev->device_wakeup) {
523                 gpiod_set_value(bdev->device_wakeup, false);
524                 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
525                 mdelay(15);
526         }
527
528         return 0;
529 }
530
531 static int bcm_resume_device(struct device *dev)
532 {
533         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
534
535         bt_dev_dbg(bdev, "");
536
537         if (bdev->device_wakeup) {
538                 gpiod_set_value(bdev->device_wakeup, true);
539                 bt_dev_dbg(bdev, "resume, delaying 15 ms");
540                 mdelay(15);
541         }
542
543         /* When this executes, the device has woken up already */
544         if (bdev->is_suspended && bdev->hu) {
545                 bdev->is_suspended = false;
546
547                 hci_uart_set_flow_control(bdev->hu, false);
548         }
549
550         return 0;
551 }
552 #endif
553
554 #ifdef CONFIG_PM_SLEEP
555 /* Platform suspend callback */
556 static int bcm_suspend(struct device *dev)
557 {
558         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
559         int error;
560
561         bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
562
563         /* bcm_suspend can be called at any time as long as platform device is
564          * bound, so it should use bcm_device_lock to protect access to hci_uart
565          * and device_wake-up GPIO.
566          */
567         mutex_lock(&bcm_device_lock);
568
569         if (!bdev->hu)
570                 goto unlock;
571
572         if (pm_runtime_active(dev))
573                 bcm_suspend_device(dev);
574
575         if (device_may_wakeup(&bdev->pdev->dev)) {
576                 error = enable_irq_wake(bdev->irq);
577                 if (!error)
578                         bt_dev_dbg(bdev, "BCM irq: enabled");
579         }
580
581 unlock:
582         mutex_unlock(&bcm_device_lock);
583
584         return 0;
585 }
586
587 /* Platform resume callback */
588 static int bcm_resume(struct device *dev)
589 {
590         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
591
592         bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
593
594         /* bcm_resume can be called at any time as long as platform device is
595          * bound, so it should use bcm_device_lock to protect access to hci_uart
596          * and device_wake-up GPIO.
597          */
598         mutex_lock(&bcm_device_lock);
599
600         if (!bdev->hu)
601                 goto unlock;
602
603         if (device_may_wakeup(&bdev->pdev->dev)) {
604                 disable_irq_wake(bdev->irq);
605                 bt_dev_dbg(bdev, "BCM irq: disabled");
606         }
607
608         bcm_resume_device(dev);
609
610 unlock:
611         mutex_unlock(&bcm_device_lock);
612
613         pm_runtime_disable(dev);
614         pm_runtime_set_active(dev);
615         pm_runtime_enable(dev);
616
617         return 0;
618 }
619 #endif
620
621 static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
622 static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
623 static const struct acpi_gpio_params host_wakeup_gpios = { 2, 0, false };
624
625 static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
626         { "device-wakeup-gpios", &device_wakeup_gpios, 1 },
627         { "shutdown-gpios", &shutdown_gpios, 1 },
628         { "host-wakeup-gpios", &host_wakeup_gpios, 1 },
629         { },
630 };
631
632 #ifdef CONFIG_ACPI
633 static u8 acpi_active_low = ACPI_ACTIVE_LOW;
634
635 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
636 static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = {
637         {
638                 .ident = "Asus T100TA",
639                 .matches = {
640                         DMI_EXACT_MATCH(DMI_SYS_VENDOR,
641                                         "ASUSTeK COMPUTER INC."),
642                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
643                 },
644                 .driver_data = &acpi_active_low,
645         },
646         { }
647 };
648
649 static int bcm_resource(struct acpi_resource *ares, void *data)
650 {
651         struct bcm_device *dev = data;
652         struct acpi_resource_extended_irq *irq;
653         struct acpi_resource_gpio *gpio;
654         struct acpi_resource_uart_serialbus *sb;
655
656         switch (ares->type) {
657         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
658                 irq = &ares->data.extended_irq;
659                 dev->irq_polarity = irq->polarity;
660                 break;
661
662         case ACPI_RESOURCE_TYPE_GPIO:
663                 gpio = &ares->data.gpio;
664                 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
665                         dev->irq_polarity = gpio->polarity;
666                 break;
667
668         case ACPI_RESOURCE_TYPE_SERIAL_BUS:
669                 sb = &ares->data.uart_serial_bus;
670                 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
671                         dev->init_speed = sb->default_baud_rate;
672                 break;
673
674         default:
675                 break;
676         }
677
678         /* Always tell the ACPI core to skip this resource */
679         return 1;
680 }
681
682 static int bcm_acpi_probe(struct bcm_device *dev)
683 {
684         struct platform_device *pdev = dev->pdev;
685         LIST_HEAD(resources);
686         const struct dmi_system_id *dmi_id;
687         int ret;
688
689         /* Retrieve GPIO data */
690         dev->name = dev_name(&pdev->dev);
691         ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
692                                         acpi_bcm_default_gpios);
693         if (ret)
694                 return ret;
695
696         dev->clk = devm_clk_get(&pdev->dev, NULL);
697
698         dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
699                                                      "device-wakeup",
700                                                      GPIOD_OUT_LOW);
701         if (IS_ERR(dev->device_wakeup))
702                 return PTR_ERR(dev->device_wakeup);
703
704         dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
705                                                 GPIOD_OUT_LOW);
706         if (IS_ERR(dev->shutdown))
707                 return PTR_ERR(dev->shutdown);
708
709         /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
710         dev->irq = platform_get_irq(pdev, 0);
711         if (dev->irq <= 0) {
712                 struct gpio_desc *gpio;
713
714                 gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup",
715                                                GPIOD_IN);
716                 if (IS_ERR(gpio))
717                         return PTR_ERR(gpio);
718
719                 dev->irq = gpiod_to_irq(gpio);
720         }
721
722         dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq);
723
724         /* Make sure at-least one of the GPIO is defined and that
725          * a name is specified for this instance
726          */
727         if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
728                 dev_err(&pdev->dev, "invalid platform data\n");
729                 return -EINVAL;
730         }
731
732         /* Retrieve UART ACPI info */
733         ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev),
734                                      &resources, bcm_resource, dev);
735         if (ret < 0)
736                 return ret;
737         acpi_dev_free_resource_list(&resources);
738
739         dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table);
740         if (dmi_id) {
741                 bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low",
742                             dmi_id->ident);
743                 dev->irq_polarity = *(u8 *)dmi_id->driver_data;
744         }
745
746         return 0;
747 }
748 #else
749 static int bcm_acpi_probe(struct bcm_device *dev)
750 {
751         return -EINVAL;
752 }
753 #endif /* CONFIG_ACPI */
754
755 static int bcm_probe(struct platform_device *pdev)
756 {
757         struct bcm_device *dev;
758         int ret;
759
760         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
761         if (!dev)
762                 return -ENOMEM;
763
764         dev->pdev = pdev;
765
766         ret = bcm_acpi_probe(dev);
767         if (ret)
768                 return ret;
769
770         platform_set_drvdata(pdev, dev);
771
772         dev_info(&pdev->dev, "%s device registered.\n", dev->name);
773
774         /* Place this instance on the device list */
775         mutex_lock(&bcm_device_lock);
776         list_add_tail(&dev->list, &bcm_device_list);
777         mutex_unlock(&bcm_device_lock);
778
779         bcm_gpio_set_power(dev, false);
780
781         return 0;
782 }
783
784 static int bcm_remove(struct platform_device *pdev)
785 {
786         struct bcm_device *dev = platform_get_drvdata(pdev);
787
788         mutex_lock(&bcm_device_lock);
789         list_del(&dev->list);
790         mutex_unlock(&bcm_device_lock);
791
792         acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
793
794         dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
795
796         return 0;
797 }
798
799 static const struct hci_uart_proto bcm_proto = {
800         .id             = HCI_UART_BCM,
801         .name           = "BCM",
802         .manufacturer   = 15,
803         .init_speed     = 115200,
804         .oper_speed     = 4000000,
805         .open           = bcm_open,
806         .close          = bcm_close,
807         .flush          = bcm_flush,
808         .setup          = bcm_setup,
809         .set_baudrate   = bcm_set_baudrate,
810         .recv           = bcm_recv,
811         .enqueue        = bcm_enqueue,
812         .dequeue        = bcm_dequeue,
813 };
814
815 #ifdef CONFIG_ACPI
816 static const struct acpi_device_id bcm_acpi_match[] = {
817         { "BCM2E39", 0 },
818         { "BCM2E65", 0 },
819         { "BCM2E67", 0 },
820         { },
821 };
822 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
823 #endif
824
825 /* Platform suspend and resume callbacks */
826 static const struct dev_pm_ops bcm_pm_ops = {
827         SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
828         SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
829 };
830
831 static struct platform_driver bcm_driver = {
832         .probe = bcm_probe,
833         .remove = bcm_remove,
834         .driver = {
835                 .name = "hci_bcm",
836                 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
837                 .pm = &bcm_pm_ops,
838         },
839 };
840
841 int __init bcm_init(void)
842 {
843         platform_driver_register(&bcm_driver);
844
845         return hci_uart_register_proto(&bcm_proto);
846 }
847
848 int __exit bcm_deinit(void)
849 {
850         platform_driver_unregister(&bcm_driver);
851
852         return hci_uart_unregister_proto(&bcm_proto);
853 }