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
bcm_set_baudrate(struct hci_uart * hu,unsigned int speed)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), ¶m,
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 */
bcm_device_exists(struct bcm_device * device)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
bcm_gpio_set_power(struct bcm_device * dev,bool powered)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
bcm_host_wake(int irq,void * data)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
bcm_request_irq(struct bcm_data * bcm)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
bcm_setup_sleep(struct hci_uart * hu)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
bcm_request_irq(struct bcm_data * bcm)248 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
bcm_setup_sleep(struct hci_uart * hu)249 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
250 #endif
251
bcm_set_diag(struct hci_dev * hdev,bool enable)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
bcm_open(struct hci_uart * hu)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 if (!hci_uart_has_flow_control(hu))
283 return -EOPNOTSUPP;
284
285 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
286 if (!bcm)
287 return -ENOMEM;
288
289 skb_queue_head_init(&bcm->txq);
290
291 hu->priv = bcm;
292
293 if (!hu->tty->dev)
294 goto out;
295
296 mutex_lock(&bcm_device_lock);
297 list_for_each(p, &bcm_device_list) {
298 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
299
300 /* Retrieve saved bcm_device based on parent of the
301 * platform device (saved during device probe) and
302 * parent of tty device used by hci_uart
303 */
304 if (hu->tty->dev->parent == dev->pdev->dev.parent) {
305 bcm->dev = dev;
306 hu->init_speed = dev->init_speed;
307 #ifdef CONFIG_PM
308 dev->hu = hu;
309 #endif
310 bcm_gpio_set_power(bcm->dev, true);
311 break;
312 }
313 }
314
315 mutex_unlock(&bcm_device_lock);
316 out:
317 return 0;
318 }
319
bcm_close(struct hci_uart * hu)320 static int bcm_close(struct hci_uart *hu)
321 {
322 struct bcm_data *bcm = hu->priv;
323 struct bcm_device *bdev = bcm->dev;
324
325 bt_dev_dbg(hu->hdev, "hu %p", hu);
326
327 /* Protect bcm->dev against removal of the device or driver */
328 mutex_lock(&bcm_device_lock);
329 if (bcm_device_exists(bdev)) {
330 bcm_gpio_set_power(bdev, false);
331 #ifdef CONFIG_PM
332 pm_runtime_disable(&bdev->pdev->dev);
333 pm_runtime_set_suspended(&bdev->pdev->dev);
334
335 if (device_can_wakeup(&bdev->pdev->dev)) {
336 devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev);
337 device_init_wakeup(&bdev->pdev->dev, false);
338 }
339
340 bdev->hu = NULL;
341 #endif
342 }
343 mutex_unlock(&bcm_device_lock);
344
345 skb_queue_purge(&bcm->txq);
346 kfree_skb(bcm->rx_skb);
347 kfree(bcm);
348
349 hu->priv = NULL;
350 return 0;
351 }
352
bcm_flush(struct hci_uart * hu)353 static int bcm_flush(struct hci_uart *hu)
354 {
355 struct bcm_data *bcm = hu->priv;
356
357 bt_dev_dbg(hu->hdev, "hu %p", hu);
358
359 skb_queue_purge(&bcm->txq);
360
361 return 0;
362 }
363
bcm_setup(struct hci_uart * hu)364 static int bcm_setup(struct hci_uart *hu)
365 {
366 struct bcm_data *bcm = hu->priv;
367 char fw_name[64];
368 const struct firmware *fw;
369 unsigned int speed;
370 int err;
371
372 bt_dev_dbg(hu->hdev, "hu %p", hu);
373
374 hu->hdev->set_diag = bcm_set_diag;
375 hu->hdev->set_bdaddr = btbcm_set_bdaddr;
376
377 err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
378 if (err)
379 return err;
380
381 err = request_firmware(&fw, fw_name, &hu->hdev->dev);
382 if (err < 0) {
383 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
384 return 0;
385 }
386
387 err = btbcm_patchram(hu->hdev, fw);
388 if (err) {
389 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
390 goto finalize;
391 }
392
393 /* Init speed if any */
394 if (hu->init_speed)
395 speed = hu->init_speed;
396 else if (hu->proto->init_speed)
397 speed = hu->proto->init_speed;
398 else
399 speed = 0;
400
401 if (speed)
402 hci_uart_set_baudrate(hu, speed);
403
404 /* Operational speed if any */
405 if (hu->oper_speed)
406 speed = hu->oper_speed;
407 else if (hu->proto->oper_speed)
408 speed = hu->proto->oper_speed;
409 else
410 speed = 0;
411
412 if (speed) {
413 err = bcm_set_baudrate(hu, speed);
414 if (!err)
415 hci_uart_set_baudrate(hu, speed);
416 }
417
418 finalize:
419 release_firmware(fw);
420
421 err = btbcm_finalize(hu->hdev);
422 if (err)
423 return err;
424
425 err = bcm_request_irq(bcm);
426 if (!err)
427 err = bcm_setup_sleep(hu);
428
429 return err;
430 }
431
432 #define BCM_RECV_LM_DIAG \
433 .type = BCM_LM_DIAG_PKT, \
434 .hlen = BCM_LM_DIAG_SIZE, \
435 .loff = 0, \
436 .lsize = 0, \
437 .maxlen = BCM_LM_DIAG_SIZE
438
439 static const struct h4_recv_pkt bcm_recv_pkts[] = {
440 { H4_RECV_ACL, .recv = hci_recv_frame },
441 { H4_RECV_SCO, .recv = hci_recv_frame },
442 { H4_RECV_EVENT, .recv = hci_recv_frame },
443 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag },
444 };
445
bcm_recv(struct hci_uart * hu,const void * data,int count)446 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
447 {
448 struct bcm_data *bcm = hu->priv;
449
450 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
451 return -EUNATCH;
452
453 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
454 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
455 if (IS_ERR(bcm->rx_skb)) {
456 int err = PTR_ERR(bcm->rx_skb);
457 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
458 bcm->rx_skb = NULL;
459 return err;
460 } else if (!bcm->rx_skb) {
461 /* Delay auto-suspend when receiving completed packet */
462 mutex_lock(&bcm_device_lock);
463 if (bcm->dev && bcm_device_exists(bcm->dev)) {
464 pm_runtime_get(&bcm->dev->pdev->dev);
465 pm_runtime_mark_last_busy(&bcm->dev->pdev->dev);
466 pm_runtime_put_autosuspend(&bcm->dev->pdev->dev);
467 }
468 mutex_unlock(&bcm_device_lock);
469 }
470
471 return count;
472 }
473
bcm_enqueue(struct hci_uart * hu,struct sk_buff * skb)474 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
475 {
476 struct bcm_data *bcm = hu->priv;
477
478 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
479
480 /* Prepend skb with frame type */
481 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
482 skb_queue_tail(&bcm->txq, skb);
483
484 return 0;
485 }
486
bcm_dequeue(struct hci_uart * hu)487 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
488 {
489 struct bcm_data *bcm = hu->priv;
490 struct sk_buff *skb = NULL;
491 struct bcm_device *bdev = NULL;
492
493 mutex_lock(&bcm_device_lock);
494
495 if (bcm_device_exists(bcm->dev)) {
496 bdev = bcm->dev;
497 pm_runtime_get_sync(&bdev->pdev->dev);
498 /* Shall be resumed here */
499 }
500
501 skb = skb_dequeue(&bcm->txq);
502
503 if (bdev) {
504 pm_runtime_mark_last_busy(&bdev->pdev->dev);
505 pm_runtime_put_autosuspend(&bdev->pdev->dev);
506 }
507
508 mutex_unlock(&bcm_device_lock);
509
510 return skb;
511 }
512
513 #ifdef CONFIG_PM
bcm_suspend_device(struct device * dev)514 static int bcm_suspend_device(struct device *dev)
515 {
516 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
517
518 bt_dev_dbg(bdev, "");
519
520 if (!bdev->is_suspended && bdev->hu) {
521 hci_uart_set_flow_control(bdev->hu, true);
522
523 /* Once this returns, driver suspends BT via GPIO */
524 bdev->is_suspended = true;
525 }
526
527 /* Suspend the device */
528 if (bdev->device_wakeup) {
529 gpiod_set_value(bdev->device_wakeup, false);
530 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
531 mdelay(15);
532 }
533
534 return 0;
535 }
536
bcm_resume_device(struct device * dev)537 static int bcm_resume_device(struct device *dev)
538 {
539 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
540
541 bt_dev_dbg(bdev, "");
542
543 if (bdev->device_wakeup) {
544 gpiod_set_value(bdev->device_wakeup, true);
545 bt_dev_dbg(bdev, "resume, delaying 15 ms");
546 mdelay(15);
547 }
548
549 /* When this executes, the device has woken up already */
550 if (bdev->is_suspended && bdev->hu) {
551 bdev->is_suspended = false;
552
553 hci_uart_set_flow_control(bdev->hu, false);
554 }
555
556 return 0;
557 }
558 #endif
559
560 #ifdef CONFIG_PM_SLEEP
561 /* Platform suspend callback */
bcm_suspend(struct device * dev)562 static int bcm_suspend(struct device *dev)
563 {
564 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
565 int error;
566
567 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
568
569 /* bcm_suspend can be called at any time as long as platform device is
570 * bound, so it should use bcm_device_lock to protect access to hci_uart
571 * and device_wake-up GPIO.
572 */
573 mutex_lock(&bcm_device_lock);
574
575 if (!bdev->hu)
576 goto unlock;
577
578 if (pm_runtime_active(dev))
579 bcm_suspend_device(dev);
580
581 if (device_may_wakeup(&bdev->pdev->dev)) {
582 error = enable_irq_wake(bdev->irq);
583 if (!error)
584 bt_dev_dbg(bdev, "BCM irq: enabled");
585 }
586
587 unlock:
588 mutex_unlock(&bcm_device_lock);
589
590 return 0;
591 }
592
593 /* Platform resume callback */
bcm_resume(struct device * dev)594 static int bcm_resume(struct device *dev)
595 {
596 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
597
598 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
599
600 /* bcm_resume can be called at any time as long as platform device is
601 * bound, so it should use bcm_device_lock to protect access to hci_uart
602 * and device_wake-up GPIO.
603 */
604 mutex_lock(&bcm_device_lock);
605
606 if (!bdev->hu)
607 goto unlock;
608
609 if (device_may_wakeup(&bdev->pdev->dev)) {
610 disable_irq_wake(bdev->irq);
611 bt_dev_dbg(bdev, "BCM irq: disabled");
612 }
613
614 bcm_resume_device(dev);
615
616 unlock:
617 mutex_unlock(&bcm_device_lock);
618
619 pm_runtime_disable(dev);
620 pm_runtime_set_active(dev);
621 pm_runtime_enable(dev);
622
623 return 0;
624 }
625 #endif
626
627 static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
628 static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
629 static const struct acpi_gpio_params host_wakeup_gpios = { 2, 0, false };
630
631 static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
632 { "device-wakeup-gpios", &device_wakeup_gpios, 1 },
633 { "shutdown-gpios", &shutdown_gpios, 1 },
634 { "host-wakeup-gpios", &host_wakeup_gpios, 1 },
635 { },
636 };
637
638 #ifdef CONFIG_ACPI
639 static u8 acpi_active_low = ACPI_ACTIVE_LOW;
640
641 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
642 static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = {
643 {
644 .ident = "Asus T100TA",
645 .matches = {
646 DMI_EXACT_MATCH(DMI_SYS_VENDOR,
647 "ASUSTeK COMPUTER INC."),
648 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
649 },
650 .driver_data = &acpi_active_low,
651 },
652 { }
653 };
654
bcm_resource(struct acpi_resource * ares,void * data)655 static int bcm_resource(struct acpi_resource *ares, void *data)
656 {
657 struct bcm_device *dev = data;
658 struct acpi_resource_extended_irq *irq;
659 struct acpi_resource_gpio *gpio;
660 struct acpi_resource_uart_serialbus *sb;
661
662 switch (ares->type) {
663 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
664 irq = &ares->data.extended_irq;
665 dev->irq_polarity = irq->polarity;
666 break;
667
668 case ACPI_RESOURCE_TYPE_GPIO:
669 gpio = &ares->data.gpio;
670 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
671 dev->irq_polarity = gpio->polarity;
672 break;
673
674 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
675 sb = &ares->data.uart_serial_bus;
676 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
677 dev->init_speed = sb->default_baud_rate;
678 break;
679
680 default:
681 break;
682 }
683
684 /* Always tell the ACPI core to skip this resource */
685 return 1;
686 }
687
bcm_acpi_probe(struct bcm_device * dev)688 static int bcm_acpi_probe(struct bcm_device *dev)
689 {
690 struct platform_device *pdev = dev->pdev;
691 LIST_HEAD(resources);
692 const struct dmi_system_id *dmi_id;
693 int ret;
694
695 /* Retrieve GPIO data */
696 dev->name = dev_name(&pdev->dev);
697 ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
698 acpi_bcm_default_gpios);
699 if (ret)
700 return ret;
701
702 dev->clk = devm_clk_get(&pdev->dev, NULL);
703
704 dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
705 "device-wakeup",
706 GPIOD_OUT_LOW);
707 if (IS_ERR(dev->device_wakeup))
708 return PTR_ERR(dev->device_wakeup);
709
710 dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
711 GPIOD_OUT_LOW);
712 if (IS_ERR(dev->shutdown))
713 return PTR_ERR(dev->shutdown);
714
715 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
716 dev->irq = platform_get_irq(pdev, 0);
717 if (dev->irq <= 0) {
718 struct gpio_desc *gpio;
719
720 gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup",
721 GPIOD_IN);
722 if (IS_ERR(gpio))
723 return PTR_ERR(gpio);
724
725 dev->irq = gpiod_to_irq(gpio);
726 }
727
728 dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq);
729
730 /* Make sure at-least one of the GPIO is defined and that
731 * a name is specified for this instance
732 */
733 if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
734 dev_err(&pdev->dev, "invalid platform data\n");
735 return -EINVAL;
736 }
737
738 /* Retrieve UART ACPI info */
739 ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev),
740 &resources, bcm_resource, dev);
741 if (ret < 0)
742 return ret;
743 acpi_dev_free_resource_list(&resources);
744
745 dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table);
746 if (dmi_id) {
747 bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low",
748 dmi_id->ident);
749 dev->irq_polarity = *(u8 *)dmi_id->driver_data;
750 }
751
752 return 0;
753 }
754 #else
bcm_acpi_probe(struct bcm_device * dev)755 static int bcm_acpi_probe(struct bcm_device *dev)
756 {
757 return -EINVAL;
758 }
759 #endif /* CONFIG_ACPI */
760
bcm_probe(struct platform_device * pdev)761 static int bcm_probe(struct platform_device *pdev)
762 {
763 struct bcm_device *dev;
764 int ret;
765
766 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
767 if (!dev)
768 return -ENOMEM;
769
770 dev->pdev = pdev;
771
772 ret = bcm_acpi_probe(dev);
773 if (ret)
774 return ret;
775
776 platform_set_drvdata(pdev, dev);
777
778 dev_info(&pdev->dev, "%s device registered.\n", dev->name);
779
780 /* Place this instance on the device list */
781 mutex_lock(&bcm_device_lock);
782 list_add_tail(&dev->list, &bcm_device_list);
783 mutex_unlock(&bcm_device_lock);
784
785 bcm_gpio_set_power(dev, false);
786
787 return 0;
788 }
789
bcm_remove(struct platform_device * pdev)790 static int bcm_remove(struct platform_device *pdev)
791 {
792 struct bcm_device *dev = platform_get_drvdata(pdev);
793
794 mutex_lock(&bcm_device_lock);
795 list_del(&dev->list);
796 mutex_unlock(&bcm_device_lock);
797
798 acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
799
800 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
801
802 return 0;
803 }
804
805 static const struct hci_uart_proto bcm_proto = {
806 .id = HCI_UART_BCM,
807 .name = "BCM",
808 .manufacturer = 15,
809 .init_speed = 115200,
810 .oper_speed = 4000000,
811 .open = bcm_open,
812 .close = bcm_close,
813 .flush = bcm_flush,
814 .setup = bcm_setup,
815 .set_baudrate = bcm_set_baudrate,
816 .recv = bcm_recv,
817 .enqueue = bcm_enqueue,
818 .dequeue = bcm_dequeue,
819 };
820
821 #ifdef CONFIG_ACPI
822 static const struct acpi_device_id bcm_acpi_match[] = {
823 { "BCM2E39", 0 },
824 { "BCM2E67", 0 },
825 { },
826 };
827 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
828 #endif
829
830 /* Platform suspend and resume callbacks */
831 static const struct dev_pm_ops bcm_pm_ops = {
832 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
833 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
834 };
835
836 static struct platform_driver bcm_driver = {
837 .probe = bcm_probe,
838 .remove = bcm_remove,
839 .driver = {
840 .name = "hci_bcm",
841 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
842 .pm = &bcm_pm_ops,
843 },
844 };
845
bcm_init(void)846 int __init bcm_init(void)
847 {
848 platform_driver_register(&bcm_driver);
849
850 return hci_uart_register_proto(&bcm_proto);
851 }
852
bcm_deinit(void)853 int __exit bcm_deinit(void)
854 {
855 platform_driver_unregister(&bcm_driver);
856
857 return hci_uart_unregister_proto(&bcm_proto);
858 }
859