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net/x25: do not hold the cpu too long in x25_new_lci()
[linux-stable.git] / drivers / bluetooth / hci_bcm.c
blob32527bdf4b50995445196b8074c96033c9123615
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_device.h>
33 #include <linux/clk.h>
34 #include <linux/gpio/consumer.h>
35 #include <linux/tty.h>
36 #include <linux/interrupt.h>
37 #include <linux/dmi.h>
38 #include <linux/pm_runtime.h>
39 #include <linux/serdev.h>
40
41 #include <net/bluetooth/bluetooth.h>
42 #include <net/bluetooth/hci_core.h>
43
44 #include "btbcm.h"
45 #include "hci_uart.h"
46
47 #define BCM_NULL_PKT 0x00
48 #define BCM_NULL_SIZE 0
49
50 #define BCM_LM_DIAG_PKT 0x07
51 #define BCM_LM_DIAG_SIZE 63
52
53 #define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
54
55 /* platform device driver resources */
56 struct bcm_device {
57 struct list_head list;
58
59 struct platform_device *pdev;
60
61 const char *name;
62 struct gpio_desc *device_wakeup;
63 struct gpio_desc *shutdown;
64
65 struct clk *clk;
66 bool clk_enabled;
67
68 u32 init_speed;
69 u32 oper_speed;
70 int irq;
71 bool irq_active_low;
72
73 #ifdef CONFIG_PM
74 struct hci_uart *hu;
75 bool is_suspended; /* suspend/resume flag */
76 #endif
77 };
78
79 /* serdev driver resources */
80 struct bcm_serdev {
81 struct hci_uart hu;
82 };
83
84 /* generic bcm uart resources */
85 struct bcm_data {
86 struct sk_buff *rx_skb;
87 struct sk_buff_head txq;
88
89 struct bcm_device *dev;
90 };
91
92 /* List of BCM BT UART devices */
93 static DEFINE_MUTEX(bcm_device_lock);
94 static LIST_HEAD(bcm_device_list);
95
96 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
97 {
98 if (hu->serdev)
99 serdev_device_set_baudrate(hu->serdev, speed);
100 else
101 hci_uart_set_baudrate(hu, speed);
102 }
103
104 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
105 {
106 struct hci_dev *hdev = hu->hdev;
107 struct sk_buff *skb;
108 struct bcm_update_uart_baud_rate param;
109
110 if (speed > 3000000) {
111 struct bcm_write_uart_clock_setting clock;
112
113 clock.type = BCM_UART_CLOCK_48MHZ;
114
115 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
116
117 /* This Broadcom specific command changes the UART's controller
118 * clock for baud rate > 3000000.
119 */
120 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
121 if (IS_ERR(skb)) {
122 int err = PTR_ERR(skb);
123 bt_dev_err(hdev, "BCM: failed to write clock (%d)",
124 err);
125 return err;
126 }
127
128 kfree_skb(skb);
129 }
130
131 bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
132
133 param.zero = cpu_to_le16(0);
134 param.baud_rate = cpu_to_le32(speed);
135
136 /* This Broadcom specific command changes the UART's controller baud
137 * rate.
138 */
139 skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
140 HCI_INIT_TIMEOUT);
141 if (IS_ERR(skb)) {
142 int err = PTR_ERR(skb);
143 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
144 err);
145 return err;
146 }
147
148 kfree_skb(skb);
149
150 return 0;
151 }
152
153 /* bcm_device_exists should be protected by bcm_device_lock */
154 static bool bcm_device_exists(struct bcm_device *device)
155 {
156 struct list_head *p;
157
158 list_for_each(p, &bcm_device_list) {
159 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
160
161 if (device == dev)
162 return true;
163 }
164
165 return false;
166 }
167
168 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
169 {
170 if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
171 clk_prepare_enable(dev->clk);
172
173 gpiod_set_value(dev->shutdown, powered);
174 gpiod_set_value(dev->device_wakeup, powered);
175
176 if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
177 clk_disable_unprepare(dev->clk);
178
179 dev->clk_enabled = powered;
180
181 return 0;
182 }
183
184 #ifdef CONFIG_PM
185 static irqreturn_t bcm_host_wake(int irq, void *data)
186 {
187 struct bcm_device *bdev = data;
188
189 bt_dev_dbg(bdev, "Host wake IRQ");
190
191 pm_runtime_get(&bdev->pdev->dev);
192 pm_runtime_mark_last_busy(&bdev->pdev->dev);
193 pm_runtime_put_autosuspend(&bdev->pdev->dev);
194
195 return IRQ_HANDLED;
196 }
197
198 static int bcm_request_irq(struct bcm_data *bcm)
199 {
200 struct bcm_device *bdev = bcm->dev;
201 int err;
202
203 /* If this is not a platform device, do not enable PM functionalities */
204 mutex_lock(&bcm_device_lock);
205 if (!bcm_device_exists(bdev)) {
206 err = -ENODEV;
207 goto unlock;
208 }
209
210 if (bdev->irq <= 0) {
211 err = -EOPNOTSUPP;
212 goto unlock;
213 }
214
215 err = devm_request_irq(&bdev->pdev->dev, bdev->irq, bcm_host_wake,
216 bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
217 IRQF_TRIGGER_RISING,
218 "host_wake", bdev);
219 if (err)
220 goto unlock;
221
222 device_init_wakeup(&bdev->pdev->dev, true);
223
224 pm_runtime_set_autosuspend_delay(&bdev->pdev->dev,
225 BCM_AUTOSUSPEND_DELAY);
226 pm_runtime_use_autosuspend(&bdev->pdev->dev);
227 pm_runtime_set_active(&bdev->pdev->dev);
228 pm_runtime_enable(&bdev->pdev->dev);
229
230 unlock:
231 mutex_unlock(&bcm_device_lock);
232
233 return err;
234 }
235
236 static const struct bcm_set_sleep_mode default_sleep_params = {
237 .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
238 .idle_host = 2, /* idle threshold HOST, in 300ms */
239 .idle_dev = 2, /* idle threshold device, in 300ms */
240 .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */
241 .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */
242 .allow_host_sleep = 1, /* Allow host sleep in SCO flag */
243 .combine_modes = 1, /* Combine sleep and LPM flag */
244 .tristate_control = 0, /* Allow tri-state control of UART tx flag */
245 /* Irrelevant USB flags */
246 .usb_auto_sleep = 0,
247 .usb_resume_timeout = 0,
248 .pulsed_host_wake = 0,
249 .break_to_host = 0
250 };
251
252 static int bcm_setup_sleep(struct hci_uart *hu)
253 {
254 struct bcm_data *bcm = hu->priv;
255 struct sk_buff *skb;
256 struct bcm_set_sleep_mode sleep_params = default_sleep_params;
257
258 sleep_params.host_wake_active = !bcm->dev->irq_active_low;
259
260 skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
261 &sleep_params, HCI_INIT_TIMEOUT);
262 if (IS_ERR(skb)) {
263 int err = PTR_ERR(skb);
264 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
265 return err;
266 }
267 kfree_skb(skb);
268
269 bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
270
271 return 0;
272 }
273 #else
274 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
275 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
276 #endif
277
278 static int bcm_set_diag(struct hci_dev *hdev, bool enable)
279 {
280 struct hci_uart *hu = hci_get_drvdata(hdev);
281 struct bcm_data *bcm = hu->priv;
282 struct sk_buff *skb;
283
284 if (!test_bit(HCI_RUNNING, &hdev->flags))
285 return -ENETDOWN;
286
287 skb = bt_skb_alloc(3, GFP_KERNEL);
288 if (!skb)
289 return -ENOMEM;
290
291 skb_put_u8(skb, BCM_LM_DIAG_PKT);
292 skb_put_u8(skb, 0xf0);
293 skb_put_u8(skb, enable);
294
295 skb_queue_tail(&bcm->txq, skb);
296 hci_uart_tx_wakeup(hu);
297
298 return 0;
299 }
300
301 static int bcm_open(struct hci_uart *hu)
302 {
303 struct bcm_data *bcm;
304 struct list_head *p;
305
306 bt_dev_dbg(hu->hdev, "hu %p", hu);
307
308 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
309 if (!bcm)
310 return -ENOMEM;
311
312 skb_queue_head_init(&bcm->txq);
313
314 hu->priv = bcm;
315
316 /* If this is a serdev defined device, then only use
317 * serdev open primitive and skip the rest.
318 */
319 if (hu->serdev) {
320 serdev_device_open(hu->serdev);
321 goto out;
322 }
323
324 if (!hu->tty->dev)
325 goto out;
326
327 mutex_lock(&bcm_device_lock);
328 list_for_each(p, &bcm_device_list) {
329 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
330
331 /* Retrieve saved bcm_device based on parent of the
332 * platform device (saved during device probe) and
333 * parent of tty device used by hci_uart
334 */
335 if (hu->tty->dev->parent == dev->pdev->dev.parent) {
336 bcm->dev = dev;
337 hu->init_speed = dev->init_speed;
338 hu->oper_speed = dev->oper_speed;
339 #ifdef CONFIG_PM
340 dev->hu = hu;
341 #endif
342 bcm_gpio_set_power(bcm->dev, true);
343 break;
344 }
345 }
346
347 mutex_unlock(&bcm_device_lock);
348 out:
349 return 0;
350 }
351
352 static int bcm_close(struct hci_uart *hu)
353 {
354 struct bcm_data *bcm = hu->priv;
355 struct bcm_device *bdev = bcm->dev;
356
357 bt_dev_dbg(hu->hdev, "hu %p", hu);
358
359 /* If this is a serdev defined device, only use serdev
360 * close primitive and then continue as usual.
361 */
362 if (hu->serdev)
363 serdev_device_close(hu->serdev);
364
365 /* Protect bcm->dev against removal of the device or driver */
366 mutex_lock(&bcm_device_lock);
367 if (bcm_device_exists(bdev)) {
368 bcm_gpio_set_power(bdev, false);
369 #ifdef CONFIG_PM
370 pm_runtime_disable(&bdev->pdev->dev);
371 pm_runtime_set_suspended(&bdev->pdev->dev);
372
373 if (device_can_wakeup(&bdev->pdev->dev)) {
374 devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev);
375 device_init_wakeup(&bdev->pdev->dev, false);
376 }
377
378 bdev->hu = NULL;
379 #endif
380 }
381 mutex_unlock(&bcm_device_lock);
382
383 skb_queue_purge(&bcm->txq);
384 kfree_skb(bcm->rx_skb);
385 kfree(bcm);
386
387 hu->priv = NULL;
388 return 0;
389 }
390
391 static int bcm_flush(struct hci_uart *hu)
392 {
393 struct bcm_data *bcm = hu->priv;
394
395 bt_dev_dbg(hu->hdev, "hu %p", hu);
396
397 skb_queue_purge(&bcm->txq);
398
399 return 0;
400 }
401
402 static int bcm_setup(struct hci_uart *hu)
403 {
404 struct bcm_data *bcm = hu->priv;
405 char fw_name[64];
406 const struct firmware *fw;
407 unsigned int speed;
408 int err;
409
410 bt_dev_dbg(hu->hdev, "hu %p", hu);
411
412 hu->hdev->set_diag = bcm_set_diag;
413 hu->hdev->set_bdaddr = btbcm_set_bdaddr;
414
415 err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
416 if (err)
417 return err;
418
419 err = request_firmware(&fw, fw_name, &hu->hdev->dev);
420 if (err < 0) {
421 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
422 return 0;
423 }
424
425 err = btbcm_patchram(hu->hdev, fw);
426 if (err) {
427 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
428 goto finalize;
429 }
430
431 /* Init speed if any */
432 if (hu->init_speed)
433 speed = hu->init_speed;
434 else if (hu->proto->init_speed)
435 speed = hu->proto->init_speed;
436 else
437 speed = 0;
438
439 if (speed)
440 host_set_baudrate(hu, speed);
441
442 /* Operational speed if any */
443 if (hu->oper_speed)
444 speed = hu->oper_speed;
445 else if (hu->proto->oper_speed)
446 speed = hu->proto->oper_speed;
447 else
448 speed = 0;
449
450 if (speed) {
451 err = bcm_set_baudrate(hu, speed);
452 if (!err)
453 host_set_baudrate(hu, speed);
454 }
455
456 finalize:
457 release_firmware(fw);
458
459 err = btbcm_finalize(hu->hdev);
460 if (err)
461 return err;
462
463 if (!bcm_request_irq(bcm))
464 err = bcm_setup_sleep(hu);
465
466 return err;
467 }
468
469 #define BCM_RECV_LM_DIAG \
470 .type = BCM_LM_DIAG_PKT, \
471 .hlen = BCM_LM_DIAG_SIZE, \
472 .loff = 0, \
473 .lsize = 0, \
474 .maxlen = BCM_LM_DIAG_SIZE
475
476 #define BCM_RECV_NULL \
477 .type = BCM_NULL_PKT, \
478 .hlen = BCM_NULL_SIZE, \
479 .loff = 0, \
480 .lsize = 0, \
481 .maxlen = BCM_NULL_SIZE
482
483 static const struct h4_recv_pkt bcm_recv_pkts[] = {
484 { H4_RECV_ACL, .recv = hci_recv_frame },
485 { H4_RECV_SCO, .recv = hci_recv_frame },
486 { H4_RECV_EVENT, .recv = hci_recv_frame },
487 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag },
488 { BCM_RECV_NULL, .recv = hci_recv_diag },
489 };
490
491 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
492 {
493 struct bcm_data *bcm = hu->priv;
494
495 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
496 return -EUNATCH;
497
498 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
499 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
500 if (IS_ERR(bcm->rx_skb)) {
501 int err = PTR_ERR(bcm->rx_skb);
502 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
503 bcm->rx_skb = NULL;
504 return err;
505 } else if (!bcm->rx_skb) {
506 /* Delay auto-suspend when receiving completed packet */
507 mutex_lock(&bcm_device_lock);
508 if (bcm->dev && bcm_device_exists(bcm->dev)) {
509 pm_runtime_get(&bcm->dev->pdev->dev);
510 pm_runtime_mark_last_busy(&bcm->dev->pdev->dev);
511 pm_runtime_put_autosuspend(&bcm->dev->pdev->dev);
512 }
513 mutex_unlock(&bcm_device_lock);
514 }
515
516 return count;
517 }
518
519 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
520 {
521 struct bcm_data *bcm = hu->priv;
522
523 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
524
525 /* Prepend skb with frame type */
526 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
527 skb_queue_tail(&bcm->txq, skb);
528
529 return 0;
530 }
531
532 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
533 {
534 struct bcm_data *bcm = hu->priv;
535 struct sk_buff *skb = NULL;
536 struct bcm_device *bdev = NULL;
537
538 mutex_lock(&bcm_device_lock);
539
540 if (bcm_device_exists(bcm->dev)) {
541 bdev = bcm->dev;
542 pm_runtime_get_sync(&bdev->pdev->dev);
543 /* Shall be resumed here */
544 }
545
546 skb = skb_dequeue(&bcm->txq);
547
548 if (bdev) {
549 pm_runtime_mark_last_busy(&bdev->pdev->dev);
550 pm_runtime_put_autosuspend(&bdev->pdev->dev);
551 }
552
553 mutex_unlock(&bcm_device_lock);
554
555 return skb;
556 }
557
558 #ifdef CONFIG_PM
559 static int bcm_suspend_device(struct device *dev)
560 {
561 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
562
563 bt_dev_dbg(bdev, "");
564
565 if (!bdev->is_suspended && bdev->hu) {
566 hci_uart_set_flow_control(bdev->hu, true);
567
568 /* Once this returns, driver suspends BT via GPIO */
569 bdev->is_suspended = true;
570 }
571
572 /* Suspend the device */
573 if (bdev->device_wakeup) {
574 gpiod_set_value(bdev->device_wakeup, false);
575 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
576 mdelay(15);
577 }
578
579 return 0;
580 }
581
582 static int bcm_resume_device(struct device *dev)
583 {
584 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
585
586 bt_dev_dbg(bdev, "");
587
588 if (bdev->device_wakeup) {
589 gpiod_set_value(bdev->device_wakeup, true);
590 bt_dev_dbg(bdev, "resume, delaying 15 ms");
591 mdelay(15);
592 }
593
594 /* When this executes, the device has woken up already */
595 if (bdev->is_suspended && bdev->hu) {
596 bdev->is_suspended = false;
597
598 hci_uart_set_flow_control(bdev->hu, false);
599 }
600
601 return 0;
602 }
603 #endif
604
605 #ifdef CONFIG_PM_SLEEP
606 /* Platform suspend callback */
607 static int bcm_suspend(struct device *dev)
608 {
609 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
610 int error;
611
612 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
613
614 /* bcm_suspend can be called at any time as long as platform device is
615 * bound, so it should use bcm_device_lock to protect access to hci_uart
616 * and device_wake-up GPIO.
617 */
618 mutex_lock(&bcm_device_lock);
619
620 if (!bdev->hu)
621 goto unlock;
622
623 if (pm_runtime_active(dev))
624 bcm_suspend_device(dev);
625
626 if (device_may_wakeup(&bdev->pdev->dev)) {
627 error = enable_irq_wake(bdev->irq);
628 if (!error)
629 bt_dev_dbg(bdev, "BCM irq: enabled");
630 }
631
632 unlock:
633 mutex_unlock(&bcm_device_lock);
634
635 return 0;
636 }
637
638 /* Platform resume callback */
639 static int bcm_resume(struct device *dev)
640 {
641 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
642
643 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
644
645 /* bcm_resume can be called at any time as long as platform device is
646 * bound, so it should use bcm_device_lock to protect access to hci_uart
647 * and device_wake-up GPIO.
648 */
649 mutex_lock(&bcm_device_lock);
650
651 if (!bdev->hu)
652 goto unlock;
653
654 if (device_may_wakeup(&bdev->pdev->dev)) {
655 disable_irq_wake(bdev->irq);
656 bt_dev_dbg(bdev, "BCM irq: disabled");
657 }
658
659 bcm_resume_device(dev);
660
661 unlock:
662 mutex_unlock(&bcm_device_lock);
663
664 pm_runtime_disable(dev);
665 pm_runtime_set_active(dev);
666 pm_runtime_enable(dev);
667
668 return 0;
669 }
670 #endif
671
672 static const struct acpi_gpio_params int_last_device_wakeup_gpios = { 0, 0, false };
673 static const struct acpi_gpio_params int_last_shutdown_gpios = { 1, 0, false };
674 static const struct acpi_gpio_params int_last_host_wakeup_gpios = { 2, 0, false };
675
676 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
677 { "device-wakeup-gpios", &int_last_device_wakeup_gpios, 1 },
678 { "shutdown-gpios", &int_last_shutdown_gpios, 1 },
679 { "host-wakeup-gpios", &int_last_host_wakeup_gpios, 1 },
680 { },
681 };
682
683 static const struct acpi_gpio_params int_first_host_wakeup_gpios = { 0, 0, false };
684 static const struct acpi_gpio_params int_first_device_wakeup_gpios = { 1, 0, false };
685 static const struct acpi_gpio_params int_first_shutdown_gpios = { 2, 0, false };
686
687 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
688 { "device-wakeup-gpios", &int_first_device_wakeup_gpios, 1 },
689 { "shutdown-gpios", &int_first_shutdown_gpios, 1 },
690 { "host-wakeup-gpios", &int_first_host_wakeup_gpios, 1 },
691 { },
692 };
693
694 #ifdef CONFIG_ACPI
695 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
696 static const struct dmi_system_id bcm_active_low_irq_dmi_table[] = {
697 { /* Handle ThinkPad 8 tablets with BCM2E55 chipset ACPI ID */
698 .ident = "Lenovo ThinkPad 8",
699 .matches = {
700 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
701 DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "ThinkPad 8"),
702 },
703 },
704 { }
705 };
706
707 static int bcm_resource(struct acpi_resource *ares, void *data)
708 {
709 struct bcm_device *dev = data;
710 struct acpi_resource_extended_irq *irq;
711 struct acpi_resource_gpio *gpio;
712 struct acpi_resource_uart_serialbus *sb;
713
714 switch (ares->type) {
715 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
716 irq = &ares->data.extended_irq;
717 if (irq->polarity != ACPI_ACTIVE_LOW)
718 dev_info(&dev->pdev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
719 dev->irq_active_low = true;
720 break;
721
722 case ACPI_RESOURCE_TYPE_GPIO:
723 gpio = &ares->data.gpio;
724 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
725 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
726 break;
727
728 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
729 sb = &ares->data.uart_serial_bus;
730 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
731 dev->init_speed = sb->default_baud_rate;
732 dev->oper_speed = 4000000;
733 }
734 break;
735
736 default:
737 break;
738 }
739
740 /* Always tell the ACPI core to skip this resource */
741 return 1;
742 }
743 #endif /* CONFIG_ACPI */
744
745 static int bcm_platform_probe(struct bcm_device *dev)
746 {
747 struct platform_device *pdev = dev->pdev;
748
749 dev->name = dev_name(&pdev->dev);
750
751 dev->clk = devm_clk_get(&pdev->dev, NULL);
752
753 dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
754 "device-wakeup",
755 GPIOD_OUT_LOW);
756 if (IS_ERR(dev->device_wakeup))
757 return PTR_ERR(dev->device_wakeup);
758
759 dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
760 GPIOD_OUT_LOW);
761 if (IS_ERR(dev->shutdown))
762 return PTR_ERR(dev->shutdown);
763
764 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
765 dev->irq = platform_get_irq(pdev, 0);
766 if (dev->irq <= 0) {
767 struct gpio_desc *gpio;
768
769 gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup",
770 GPIOD_IN);
771 if (IS_ERR(gpio))
772 return PTR_ERR(gpio);
773
774 dev->irq = gpiod_to_irq(gpio);
775 }
776
777 dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq);
778
779 /* Make sure at-least one of the GPIO is defined and that
780 * a name is specified for this instance
781 */
782 if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
783 dev_err(&pdev->dev, "invalid platform data\n");
784 return -EINVAL;
785 }
786
787 return 0;
788 }
789
790 #ifdef CONFIG_ACPI
791 static int bcm_acpi_probe(struct bcm_device *dev)
792 {
793 struct platform_device *pdev = dev->pdev;
794 LIST_HEAD(resources);
795 const struct dmi_system_id *dmi_id;
796 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
797 const struct acpi_device_id *id;
798 int ret;
799
800 /* Retrieve GPIO data */
801 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
802 if (id)
803 gpio_mapping = (const struct acpi_gpio_mapping *) id->driver_data;
804
805 ret = devm_acpi_dev_add_driver_gpios(&pdev->dev, gpio_mapping);
806 if (ret)
807 return ret;
808
809 ret = bcm_platform_probe(dev);
810 if (ret)
811 return ret;
812
813 /* Retrieve UART ACPI info */
814 ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev),
815 &resources, bcm_resource, dev);
816 if (ret < 0)
817 return ret;
818 acpi_dev_free_resource_list(&resources);
819
820 dmi_id = dmi_first_match(bcm_active_low_irq_dmi_table);
821 if (dmi_id) {
822 bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low",
823 dmi_id->ident);
824 dev->irq_active_low = true;
825 }
826
827 return 0;
828 }
829 #else
830 static int bcm_acpi_probe(struct bcm_device *dev)
831 {
832 return -EINVAL;
833 }
834 #endif /* CONFIG_ACPI */
835
836 static int bcm_probe(struct platform_device *pdev)
837 {
838 struct bcm_device *dev;
839 int ret;
840
841 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
842 if (!dev)
843 return -ENOMEM;
844
845 dev->pdev = pdev;
846
847 if (has_acpi_companion(&pdev->dev))
848 ret = bcm_acpi_probe(dev);
849 else
850 ret = bcm_platform_probe(dev);
851 if (ret)
852 return ret;
853
854 platform_set_drvdata(pdev, dev);
855
856 dev_info(&pdev->dev, "%s device registered.\n", dev->name);
857
858 /* Place this instance on the device list */
859 mutex_lock(&bcm_device_lock);
860 list_add_tail(&dev->list, &bcm_device_list);
861 mutex_unlock(&bcm_device_lock);
862
863 bcm_gpio_set_power(dev, false);
864
865 return 0;
866 }
867
868 static int bcm_remove(struct platform_device *pdev)
869 {
870 struct bcm_device *dev = platform_get_drvdata(pdev);
871
872 mutex_lock(&bcm_device_lock);
873 list_del(&dev->list);
874 mutex_unlock(&bcm_device_lock);
875
876 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
877
878 return 0;
879 }
880
881 static const struct hci_uart_proto bcm_proto = {
882 .id = HCI_UART_BCM,
883 .name = "Broadcom",
884 .manufacturer = 15,
885 .init_speed = 115200,
886 .open = bcm_open,
887 .close = bcm_close,
888 .flush = bcm_flush,
889 .setup = bcm_setup,
890 .set_baudrate = bcm_set_baudrate,
891 .recv = bcm_recv,
892 .enqueue = bcm_enqueue,
893 .dequeue = bcm_dequeue,
894 };
895
896 #ifdef CONFIG_ACPI
897 static const struct acpi_device_id bcm_acpi_match[] = {
898 { "BCM2E1A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
899 { "BCM2E39", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
900 { "BCM2E3A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
901 { "BCM2E3D", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
902 { "BCM2E3F", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
903 { "BCM2E40", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
904 { "BCM2E54", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
905 { "BCM2E55", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
906 { "BCM2E64", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
907 { "BCM2E65", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
908 { "BCM2E67", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
909 { "BCM2E71", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
910 { "BCM2E7B", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
911 { "BCM2E7C", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
912 { "BCM2E95", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
913 { "BCM2E96", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
914 { },
915 };
916 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
917 #endif
918
919 /* Platform suspend and resume callbacks */
920 static const struct dev_pm_ops bcm_pm_ops = {
921 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
922 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
923 };
924
925 static struct platform_driver bcm_driver = {
926 .probe = bcm_probe,
927 .remove = bcm_remove,
928 .driver = {
929 .name = "hci_bcm",
930 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
931 .pm = &bcm_pm_ops,
932 },
933 };
934
935 static int bcm_serdev_probe(struct serdev_device *serdev)
936 {
937 struct bcm_serdev *bcmdev;
938 u32 speed;
939 int err;
940
941 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
942 if (!bcmdev)
943 return -ENOMEM;
944
945 bcmdev->hu.serdev = serdev;
946 serdev_device_set_drvdata(serdev, bcmdev);
947
948 err = device_property_read_u32(&serdev->dev, "max-speed", &speed);
949 if (!err)
950 bcmdev->hu.oper_speed = speed;
951
952 return hci_uart_register_device(&bcmdev->hu, &bcm_proto);
953 }
954
955 static void bcm_serdev_remove(struct serdev_device *serdev)
956 {
957 struct bcm_serdev *bcmdev = serdev_device_get_drvdata(serdev);
958
959 hci_uart_unregister_device(&bcmdev->hu);
960 }
961
962 #ifdef CONFIG_OF
963 static const struct of_device_id bcm_bluetooth_of_match[] = {
964 { .compatible = "brcm,bcm43438-bt" },
965 { },
966 };
967 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
968 #endif
969
970 static struct serdev_device_driver bcm_serdev_driver = {
971 .probe = bcm_serdev_probe,
972 .remove = bcm_serdev_remove,
973 .driver = {
974 .name = "hci_uart_bcm",
975 .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
976 },
977 };
978
979 int __init bcm_init(void)
980 {
981 /* For now, we need to keep both platform device
982 * driver (ACPI generated) and serdev driver (DT).
983 */
984 platform_driver_register(&bcm_driver);
985 serdev_device_driver_register(&bcm_serdev_driver);
986
987 return hci_uart_register_proto(&bcm_proto);
988 }
989
990 int __exit bcm_deinit(void)
991 {
992 platform_driver_unregister(&bcm_driver);
993 serdev_device_driver_unregister(&bcm_serdev_driver);
994
995 return hci_uart_unregister_proto(&bcm_proto);
996 }
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