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nVMX x86: Check VPID value on vmentry of L2 guests
[linux/fpc-iii.git] / drivers / bluetooth / hci_bcm.c
blobddbd8c6a0cebd5cc7ef5d079533a31383518e5f4
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 int gpio_count;
102 int gpio_int_idx;
103 #endif
104
105 struct clk *clk;
106 bool clk_enabled;
107
108 u32 init_speed;
109 u32 oper_speed;
110 int irq;
111 bool irq_active_low;
112
113 #ifdef CONFIG_PM
114 struct hci_uart *hu;
115 bool is_suspended;
116 #endif
117 };
118
119 /* generic bcm uart resources */
120 struct bcm_data {
121 struct sk_buff *rx_skb;
122 struct sk_buff_head txq;
123
124 struct bcm_device *dev;
125 };
126
127 /* List of BCM BT UART devices */
128 static DEFINE_MUTEX(bcm_device_lock);
129 static LIST_HEAD(bcm_device_list);
130
131 static int irq_polarity = -1;
132 module_param(irq_polarity, int, 0444);
133 MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");
134
135 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
136 {
137 if (hu->serdev)
138 serdev_device_set_baudrate(hu->serdev, speed);
139 else
140 hci_uart_set_baudrate(hu, speed);
141 }
142
143 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
144 {
145 struct hci_dev *hdev = hu->hdev;
146 struct sk_buff *skb;
147 struct bcm_update_uart_baud_rate param;
148
149 if (speed > 3000000) {
150 struct bcm_write_uart_clock_setting clock;
151
152 clock.type = BCM_UART_CLOCK_48MHZ;
153
154 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
155
156 /* This Broadcom specific command changes the UART's controller
157 * clock for baud rate > 3000000.
158 */
159 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
160 if (IS_ERR(skb)) {
161 int err = PTR_ERR(skb);
162 bt_dev_err(hdev, "BCM: failed to write clock (%d)",
163 err);
164 return err;
165 }
166
167 kfree_skb(skb);
168 }
169
170 bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
171
172 param.zero = cpu_to_le16(0);
173 param.baud_rate = cpu_to_le32(speed);
174
175 /* This Broadcom specific command changes the UART's controller baud
176 * rate.
177 */
178 skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
179 HCI_INIT_TIMEOUT);
180 if (IS_ERR(skb)) {
181 int err = PTR_ERR(skb);
182 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
183 err);
184 return err;
185 }
186
187 kfree_skb(skb);
188
189 return 0;
190 }
191
192 /* bcm_device_exists should be protected by bcm_device_lock */
193 static bool bcm_device_exists(struct bcm_device *device)
194 {
195 struct list_head *p;
196
197 #ifdef CONFIG_PM
198 /* Devices using serdev always exist */
199 if (device && device->hu && device->hu->serdev)
200 return true;
201 #endif
202
203 list_for_each(p, &bcm_device_list) {
204 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
205
206 if (device == dev)
207 return true;
208 }
209
210 return false;
211 }
212
213 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
214 {
215 int err;
216
217 if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled) {
218 err = clk_prepare_enable(dev->clk);
219 if (err)
220 return err;
221 }
222
223 err = dev->set_shutdown(dev, powered);
224 if (err)
225 goto err_clk_disable;
226
227 err = dev->set_device_wakeup(dev, powered);
228 if (err)
229 goto err_revert_shutdown;
230
231 if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
232 clk_disable_unprepare(dev->clk);
233
234 dev->clk_enabled = powered;
235
236 return 0;
237
238 err_revert_shutdown:
239 dev->set_shutdown(dev, !powered);
240 err_clk_disable:
241 if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
242 clk_disable_unprepare(dev->clk);
243 return err;
244 }
245
246 #ifdef CONFIG_PM
247 static irqreturn_t bcm_host_wake(int irq, void *data)
248 {
249 struct bcm_device *bdev = data;
250
251 bt_dev_dbg(bdev, "Host wake IRQ");
252
253 pm_runtime_get(bdev->dev);
254 pm_runtime_mark_last_busy(bdev->dev);
255 pm_runtime_put_autosuspend(bdev->dev);
256
257 return IRQ_HANDLED;
258 }
259
260 static int bcm_request_irq(struct bcm_data *bcm)
261 {
262 struct bcm_device *bdev = bcm->dev;
263 int err;
264
265 mutex_lock(&bcm_device_lock);
266 if (!bcm_device_exists(bdev)) {
267 err = -ENODEV;
268 goto unlock;
269 }
270
271 if (bdev->irq <= 0) {
272 err = -EOPNOTSUPP;
273 goto unlock;
274 }
275
276 err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake,
277 bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
278 IRQF_TRIGGER_RISING,
279 "host_wake", bdev);
280 if (err) {
281 bdev->irq = err;
282 goto unlock;
283 }
284
285 device_init_wakeup(bdev->dev, true);
286
287 pm_runtime_set_autosuspend_delay(bdev->dev,
288 BCM_AUTOSUSPEND_DELAY);
289 pm_runtime_use_autosuspend(bdev->dev);
290 pm_runtime_set_active(bdev->dev);
291 pm_runtime_enable(bdev->dev);
292
293 unlock:
294 mutex_unlock(&bcm_device_lock);
295
296 return err;
297 }
298
299 static const struct bcm_set_sleep_mode default_sleep_params = {
300 .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
301 .idle_host = 2, /* idle threshold HOST, in 300ms */
302 .idle_dev = 2, /* idle threshold device, in 300ms */
303 .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */
304 .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */
305 .allow_host_sleep = 1, /* Allow host sleep in SCO flag */
306 .combine_modes = 1, /* Combine sleep and LPM flag */
307 .tristate_control = 0, /* Allow tri-state control of UART tx flag */
308 /* Irrelevant USB flags */
309 .usb_auto_sleep = 0,
310 .usb_resume_timeout = 0,
311 .break_to_host = 0,
312 .pulsed_host_wake = 1,
313 };
314
315 static int bcm_setup_sleep(struct hci_uart *hu)
316 {
317 struct bcm_data *bcm = hu->priv;
318 struct sk_buff *skb;
319 struct bcm_set_sleep_mode sleep_params = default_sleep_params;
320
321 sleep_params.host_wake_active = !bcm->dev->irq_active_low;
322
323 skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
324 &sleep_params, HCI_INIT_TIMEOUT);
325 if (IS_ERR(skb)) {
326 int err = PTR_ERR(skb);
327 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
328 return err;
329 }
330 kfree_skb(skb);
331
332 bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
333
334 return 0;
335 }
336 #else
337 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
338 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
339 #endif
340
341 static int bcm_set_diag(struct hci_dev *hdev, bool enable)
342 {
343 struct hci_uart *hu = hci_get_drvdata(hdev);
344 struct bcm_data *bcm = hu->priv;
345 struct sk_buff *skb;
346
347 if (!test_bit(HCI_RUNNING, &hdev->flags))
348 return -ENETDOWN;
349
350 skb = bt_skb_alloc(3, GFP_KERNEL);
351 if (!skb)
352 return -ENOMEM;
353
354 skb_put_u8(skb, BCM_LM_DIAG_PKT);
355 skb_put_u8(skb, 0xf0);
356 skb_put_u8(skb, enable);
357
358 skb_queue_tail(&bcm->txq, skb);
359 hci_uart_tx_wakeup(hu);
360
361 return 0;
362 }
363
364 static int bcm_open(struct hci_uart *hu)
365 {
366 struct bcm_data *bcm;
367 struct list_head *p;
368 int err;
369
370 bt_dev_dbg(hu->hdev, "hu %p", hu);
371
372 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
373 if (!bcm)
374 return -ENOMEM;
375
376 skb_queue_head_init(&bcm->txq);
377
378 hu->priv = bcm;
379
380 mutex_lock(&bcm_device_lock);
381
382 if (hu->serdev) {
383 bcm->dev = serdev_device_get_drvdata(hu->serdev);
384 goto out;
385 }
386
387 if (!hu->tty->dev)
388 goto out;
389
390 list_for_each(p, &bcm_device_list) {
391 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
392
393 /* Retrieve saved bcm_device based on parent of the
394 * platform device (saved during device probe) and
395 * parent of tty device used by hci_uart
396 */
397 if (hu->tty->dev->parent == dev->dev->parent) {
398 bcm->dev = dev;
399 #ifdef CONFIG_PM
400 dev->hu = hu;
401 #endif
402 break;
403 }
404 }
405
406 out:
407 if (bcm->dev) {
408 hu->init_speed = bcm->dev->init_speed;
409 hu->oper_speed = bcm->dev->oper_speed;
410 err = bcm_gpio_set_power(bcm->dev, true);
411 if (err)
412 goto err_unset_hu;
413 }
414
415 mutex_unlock(&bcm_device_lock);
416 return 0;
417
418 err_unset_hu:
419 #ifdef CONFIG_PM
420 if (!hu->serdev)
421 bcm->dev->hu = NULL;
422 #endif
423 mutex_unlock(&bcm_device_lock);
424 hu->priv = NULL;
425 kfree(bcm);
426 return err;
427 }
428
429 static int bcm_close(struct hci_uart *hu)
430 {
431 struct bcm_data *bcm = hu->priv;
432 struct bcm_device *bdev = NULL;
433 int err;
434
435 bt_dev_dbg(hu->hdev, "hu %p", hu);
436
437 /* Protect bcm->dev against removal of the device or driver */
438 mutex_lock(&bcm_device_lock);
439
440 if (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), false);
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_runtime_get(bcm->dev->dev);
591 pm_runtime_mark_last_busy(bcm->dev->dev);
592 pm_runtime_put_autosuspend(bcm->dev->dev);
593 }
594 mutex_unlock(&bcm_device_lock);
595 }
596
597 return count;
598 }
599
600 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
601 {
602 struct bcm_data *bcm = hu->priv;
603
604 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
605
606 /* Prepend skb with frame type */
607 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
608 skb_queue_tail(&bcm->txq, skb);
609
610 return 0;
611 }
612
613 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
614 {
615 struct bcm_data *bcm = hu->priv;
616 struct sk_buff *skb = NULL;
617 struct bcm_device *bdev = NULL;
618
619 mutex_lock(&bcm_device_lock);
620
621 if (bcm_device_exists(bcm->dev)) {
622 bdev = bcm->dev;
623 pm_runtime_get_sync(bdev->dev);
624 /* Shall be resumed here */
625 }
626
627 skb = skb_dequeue(&bcm->txq);
628
629 if (bdev) {
630 pm_runtime_mark_last_busy(bdev->dev);
631 pm_runtime_put_autosuspend(bdev->dev);
632 }
633
634 mutex_unlock(&bcm_device_lock);
635
636 return skb;
637 }
638
639 #ifdef CONFIG_PM
640 static int bcm_suspend_device(struct device *dev)
641 {
642 struct bcm_device *bdev = dev_get_drvdata(dev);
643 int err;
644
645 bt_dev_dbg(bdev, "");
646
647 if (!bdev->is_suspended && bdev->hu) {
648 hci_uart_set_flow_control(bdev->hu, true);
649
650 /* Once this returns, driver suspends BT via GPIO */
651 bdev->is_suspended = true;
652 }
653
654 /* Suspend the device */
655 err = bdev->set_device_wakeup(bdev, false);
656 if (err) {
657 if (bdev->is_suspended && bdev->hu) {
658 bdev->is_suspended = false;
659 hci_uart_set_flow_control(bdev->hu, false);
660 }
661 return -EBUSY;
662 }
663
664 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
665 msleep(15);
666
667 return 0;
668 }
669
670 static int bcm_resume_device(struct device *dev)
671 {
672 struct bcm_device *bdev = dev_get_drvdata(dev);
673 int err;
674
675 bt_dev_dbg(bdev, "");
676
677 err = bdev->set_device_wakeup(bdev, true);
678 if (err) {
679 dev_err(dev, "Failed to power up\n");
680 return err;
681 }
682
683 bt_dev_dbg(bdev, "resume, delaying 15 ms");
684 msleep(15);
685
686 /* When this executes, the device has woken up already */
687 if (bdev->is_suspended && bdev->hu) {
688 bdev->is_suspended = false;
689
690 hci_uart_set_flow_control(bdev->hu, false);
691 }
692
693 return 0;
694 }
695 #endif
696
697 #ifdef CONFIG_PM_SLEEP
698 /* suspend callback */
699 static int bcm_suspend(struct device *dev)
700 {
701 struct bcm_device *bdev = dev_get_drvdata(dev);
702 int error;
703
704 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
705
706 /*
707 * When used with a device instantiated as platform_device, bcm_suspend
708 * can be called at any time as long as the platform device is bound,
709 * so it should use bcm_device_lock to protect access to hci_uart
710 * and device_wake-up GPIO.
711 */
712 mutex_lock(&bcm_device_lock);
713
714 if (!bdev->hu)
715 goto unlock;
716
717 if (pm_runtime_active(dev))
718 bcm_suspend_device(dev);
719
720 if (device_may_wakeup(dev) && bdev->irq > 0) {
721 error = enable_irq_wake(bdev->irq);
722 if (!error)
723 bt_dev_dbg(bdev, "BCM irq: enabled");
724 }
725
726 unlock:
727 mutex_unlock(&bcm_device_lock);
728
729 return 0;
730 }
731
732 /* resume callback */
733 static int bcm_resume(struct device *dev)
734 {
735 struct bcm_device *bdev = dev_get_drvdata(dev);
736 int err = 0;
737
738 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
739
740 /*
741 * When used with a device instantiated as platform_device, bcm_resume
742 * can be called at any time as long as platform device is bound,
743 * so it should use bcm_device_lock to protect access to hci_uart
744 * and device_wake-up GPIO.
745 */
746 mutex_lock(&bcm_device_lock);
747
748 if (!bdev->hu)
749 goto unlock;
750
751 if (device_may_wakeup(dev) && bdev->irq > 0) {
752 disable_irq_wake(bdev->irq);
753 bt_dev_dbg(bdev, "BCM irq: disabled");
754 }
755
756 err = bcm_resume_device(dev);
757
758 unlock:
759 mutex_unlock(&bcm_device_lock);
760
761 if (!err) {
762 pm_runtime_disable(dev);
763 pm_runtime_set_active(dev);
764 pm_runtime_enable(dev);
765 }
766
767 return 0;
768 }
769 #endif
770
771 static const struct acpi_gpio_params first_gpio = { 0, 0, false };
772 static const struct acpi_gpio_params second_gpio = { 1, 0, false };
773 static const struct acpi_gpio_params third_gpio = { 2, 0, false };
774
775 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
776 { "device-wakeup-gpios", &first_gpio, 1 },
777 { "shutdown-gpios", &second_gpio, 1 },
778 { "host-wakeup-gpios", &third_gpio, 1 },
779 { },
780 };
781
782 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
783 { "host-wakeup-gpios", &first_gpio, 1 },
784 { "device-wakeup-gpios", &second_gpio, 1 },
785 { "shutdown-gpios", &third_gpio, 1 },
786 { },
787 };
788
789 /* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
790 static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
791 {
792 .ident = "Meegopad T08",
793 .matches = {
794 DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
795 "To be filled by OEM."),
796 DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
797 DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
798 },
799 },
800 { }
801 };
802
803 #ifdef CONFIG_ACPI
804 static int bcm_resource(struct acpi_resource *ares, void *data)
805 {
806 struct bcm_device *dev = data;
807 struct acpi_resource_extended_irq *irq;
808 struct acpi_resource_gpio *gpio;
809 struct acpi_resource_uart_serialbus *sb;
810
811 switch (ares->type) {
812 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
813 irq = &ares->data.extended_irq;
814 if (irq->polarity != ACPI_ACTIVE_LOW)
815 dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
816 dev->irq_active_low = true;
817 break;
818
819 case ACPI_RESOURCE_TYPE_GPIO:
820 gpio = &ares->data.gpio;
821 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
822 dev->gpio_int_idx = dev->gpio_count;
823 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
824 }
825 dev->gpio_count++;
826 break;
827
828 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
829 sb = &ares->data.uart_serial_bus;
830 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
831 dev->init_speed = sb->default_baud_rate;
832 dev->oper_speed = 4000000;
833 }
834 break;
835
836 default:
837 break;
838 }
839
840 return 0;
841 }
842
843 static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
844 {
845 if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
846 return -EIO;
847
848 return 0;
849 }
850
851 static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
852 {
853 if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
854 NULL, NULL, NULL)))
855 return -EIO;
856
857 return 0;
858 }
859
860 static int bcm_apple_get_resources(struct bcm_device *dev)
861 {
862 struct acpi_device *adev = ACPI_COMPANION(dev->dev);
863 const union acpi_object *obj;
864
865 if (!adev ||
866 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
867 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
868 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
869 return -ENODEV;
870
871 if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
872 obj->buffer.length == 8)
873 dev->init_speed = *(u64 *)obj->buffer.pointer;
874
875 dev->set_device_wakeup = bcm_apple_set_device_wakeup;
876 dev->set_shutdown = bcm_apple_set_shutdown;
877
878 return 0;
879 }
880 #else
881 static inline int bcm_apple_get_resources(struct bcm_device *dev)
882 {
883 return -EOPNOTSUPP;
884 }
885 #endif /* CONFIG_ACPI */
886
887 static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
888 {
889 gpiod_set_value_cansleep(dev->device_wakeup, awake);
890 return 0;
891 }
892
893 static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
894 {
895 gpiod_set_value_cansleep(dev->shutdown, powered);
896 return 0;
897 }
898
899 static int bcm_get_resources(struct bcm_device *dev)
900 {
901 const struct dmi_system_id *dmi_id;
902
903 dev->name = dev_name(dev->dev);
904
905 if (x86_apple_machine && !bcm_apple_get_resources(dev))
906 return 0;
907
908 dev->clk = devm_clk_get(dev->dev, NULL);
909
910 dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
911 GPIOD_OUT_LOW);
912 if (IS_ERR(dev->device_wakeup))
913 return PTR_ERR(dev->device_wakeup);
914
915 dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
916 GPIOD_OUT_LOW);
917 if (IS_ERR(dev->shutdown))
918 return PTR_ERR(dev->shutdown);
919
920 dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
921 dev->set_shutdown = bcm_gpio_set_shutdown;
922
923 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
924 if (dev->irq <= 0) {
925 struct gpio_desc *gpio;
926
927 gpio = devm_gpiod_get_optional(dev->dev, "host-wakeup",
928 GPIOD_IN);
929 if (IS_ERR(gpio))
930 return PTR_ERR(gpio);
931
932 dev->irq = gpiod_to_irq(gpio);
933 }
934
935 dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
936 if (dmi_id) {
937 dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
938 dmi_id->ident);
939 dev->irq = 0;
940 }
941
942 dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
943 return 0;
944 }
945
946 #ifdef CONFIG_ACPI
947 static int bcm_acpi_probe(struct bcm_device *dev)
948 {
949 LIST_HEAD(resources);
950 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
951 struct resource_entry *entry;
952 int ret;
953
954 /* Retrieve UART ACPI info */
955 dev->gpio_int_idx = -1;
956 ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
957 &resources, bcm_resource, dev);
958 if (ret < 0)
959 return ret;
960
961 resource_list_for_each_entry(entry, &resources) {
962 if (resource_type(entry->res) == IORESOURCE_IRQ) {
963 dev->irq = entry->res->start;
964 break;
965 }
966 }
967 acpi_dev_free_resource_list(&resources);
968
969 /* If the DSDT uses an Interrupt resource for the IRQ, then there are
970 * only 2 GPIO resources, we use the irq-last mapping for this, since
971 * we already have an irq the 3th / last mapping will not be used.
972 */
973 if (dev->irq)
974 gpio_mapping = acpi_bcm_int_last_gpios;
975 else if (dev->gpio_int_idx == 0)
976 gpio_mapping = acpi_bcm_int_first_gpios;
977 else if (dev->gpio_int_idx == 2)
978 gpio_mapping = acpi_bcm_int_last_gpios;
979 else
980 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
981 dev->gpio_int_idx);
982
983 /* Warn if our expectations are not met. */
984 if (dev->gpio_count != (dev->irq ? 2 : 3))
985 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
986 dev->gpio_count);
987
988 ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
989 if (ret)
990 return ret;
991
992 if (irq_polarity != -1) {
993 dev->irq_active_low = irq_polarity;
994 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
995 dev->irq_active_low ? "low" : "high");
996 }
997
998 return 0;
999 }
1000 #else
1001 static int bcm_acpi_probe(struct bcm_device *dev)
1002 {
1003 return -EINVAL;
1004 }
1005 #endif /* CONFIG_ACPI */
1006
1007 static int bcm_of_probe(struct bcm_device *bdev)
1008 {
1009 device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
1010 return 0;
1011 }
1012
1013 static int bcm_probe(struct platform_device *pdev)
1014 {
1015 struct bcm_device *dev;
1016 int ret;
1017
1018 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1019 if (!dev)
1020 return -ENOMEM;
1021
1022 dev->dev = &pdev->dev;
1023 dev->irq = platform_get_irq(pdev, 0);
1024
1025 if (has_acpi_companion(&pdev->dev)) {
1026 ret = bcm_acpi_probe(dev);
1027 if (ret)
1028 return ret;
1029 }
1030
1031 ret = bcm_get_resources(dev);
1032 if (ret)
1033 return ret;
1034
1035 platform_set_drvdata(pdev, dev);
1036
1037 dev_info(&pdev->dev, "%s device registered.\n", dev->name);
1038
1039 /* Place this instance on the device list */
1040 mutex_lock(&bcm_device_lock);
1041 list_add_tail(&dev->list, &bcm_device_list);
1042 mutex_unlock(&bcm_device_lock);
1043
1044 ret = bcm_gpio_set_power(dev, false);
1045 if (ret)
1046 dev_err(&pdev->dev, "Failed to power down\n");
1047
1048 return 0;
1049 }
1050
1051 static int bcm_remove(struct platform_device *pdev)
1052 {
1053 struct bcm_device *dev = platform_get_drvdata(pdev);
1054
1055 mutex_lock(&bcm_device_lock);
1056 list_del(&dev->list);
1057 mutex_unlock(&bcm_device_lock);
1058
1059 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
1060
1061 return 0;
1062 }
1063
1064 static const struct hci_uart_proto bcm_proto = {
1065 .id = HCI_UART_BCM,
1066 .name = "Broadcom",
1067 .manufacturer = 15,
1068 .init_speed = 115200,
1069 .open = bcm_open,
1070 .close = bcm_close,
1071 .flush = bcm_flush,
1072 .setup = bcm_setup,
1073 .set_baudrate = bcm_set_baudrate,
1074 .recv = bcm_recv,
1075 .enqueue = bcm_enqueue,
1076 .dequeue = bcm_dequeue,
1077 };
1078
1079 #ifdef CONFIG_ACPI
1080 static const struct acpi_device_id bcm_acpi_match[] = {
1081 { "BCM2E00" },
1082 { "BCM2E01" },
1083 { "BCM2E02" },
1084 { "BCM2E03" },
1085 { "BCM2E04" },
1086 { "BCM2E05" },
1087 { "BCM2E06" },
1088 { "BCM2E07" },
1089 { "BCM2E08" },
1090 { "BCM2E09" },
1091 { "BCM2E0A" },
1092 { "BCM2E0B" },
1093 { "BCM2E0C" },
1094 { "BCM2E0D" },
1095 { "BCM2E0E" },
1096 { "BCM2E0F" },
1097 { "BCM2E10" },
1098 { "BCM2E11" },
1099 { "BCM2E12" },
1100 { "BCM2E13" },
1101 { "BCM2E14" },
1102 { "BCM2E15" },
1103 { "BCM2E16" },
1104 { "BCM2E17" },
1105 { "BCM2E18" },
1106 { "BCM2E19" },
1107 { "BCM2E1A" },
1108 { "BCM2E1B" },
1109 { "BCM2E1C" },
1110 { "BCM2E1D" },
1111 { "BCM2E1F" },
1112 { "BCM2E20" },
1113 { "BCM2E21" },
1114 { "BCM2E22" },
1115 { "BCM2E23" },
1116 { "BCM2E24" },
1117 { "BCM2E25" },
1118 { "BCM2E26" },
1119 { "BCM2E27" },
1120 { "BCM2E28" },
1121 { "BCM2E29" },
1122 { "BCM2E2A" },
1123 { "BCM2E2B" },
1124 { "BCM2E2C" },
1125 { "BCM2E2D" },
1126 { "BCM2E2E" },
1127 { "BCM2E2F" },
1128 { "BCM2E30" },
1129 { "BCM2E31" },
1130 { "BCM2E32" },
1131 { "BCM2E33" },
1132 { "BCM2E34" },
1133 { "BCM2E35" },
1134 { "BCM2E36" },
1135 { "BCM2E37" },
1136 { "BCM2E38" },
1137 { "BCM2E39" },
1138 { "BCM2E3A" },
1139 { "BCM2E3B" },
1140 { "BCM2E3C" },
1141 { "BCM2E3D" },
1142 { "BCM2E3E" },
1143 { "BCM2E3F" },
1144 { "BCM2E40" },
1145 { "BCM2E41" },
1146 { "BCM2E42" },
1147 { "BCM2E43" },
1148 { "BCM2E44" },
1149 { "BCM2E45" },
1150 { "BCM2E46" },
1151 { "BCM2E47" },
1152 { "BCM2E48" },
1153 { "BCM2E49" },
1154 { "BCM2E4A" },
1155 { "BCM2E4B" },
1156 { "BCM2E4C" },
1157 { "BCM2E4D" },
1158 { "BCM2E4E" },
1159 { "BCM2E4F" },
1160 { "BCM2E50" },
1161 { "BCM2E51" },
1162 { "BCM2E52" },
1163 { "BCM2E53" },
1164 { "BCM2E54" },
1165 { "BCM2E55" },
1166 { "BCM2E56" },
1167 { "BCM2E57" },
1168 { "BCM2E58" },
1169 { "BCM2E59" },
1170 { "BCM2E5A" },
1171 { "BCM2E5B" },
1172 { "BCM2E5C" },
1173 { "BCM2E5D" },
1174 { "BCM2E5E" },
1175 { "BCM2E5F" },
1176 { "BCM2E60" },
1177 { "BCM2E61" },
1178 { "BCM2E62" },
1179 { "BCM2E63" },
1180 { "BCM2E64" },
1181 { "BCM2E65" },
1182 { "BCM2E66" },
1183 { "BCM2E67" },
1184 { "BCM2E68" },
1185 { "BCM2E69" },
1186 { "BCM2E6B" },
1187 { "BCM2E6D" },
1188 { "BCM2E6E" },
1189 { "BCM2E6F" },
1190 { "BCM2E70" },
1191 { "BCM2E71" },
1192 { "BCM2E72" },
1193 { "BCM2E73" },
1194 { "BCM2E74" },
1195 { "BCM2E75" },
1196 { "BCM2E76" },
1197 { "BCM2E77" },
1198 { "BCM2E78" },
1199 { "BCM2E79" },
1200 { "BCM2E7A" },
1201 { "BCM2E7B" },
1202 { "BCM2E7C" },
1203 { "BCM2E7D" },
1204 { "BCM2E7E" },
1205 { "BCM2E7F" },
1206 { "BCM2E80" },
1207 { "BCM2E81" },
1208 { "BCM2E82" },
1209 { "BCM2E83" },
1210 { "BCM2E84" },
1211 { "BCM2E85" },
1212 { "BCM2E86" },
1213 { "BCM2E87" },
1214 { "BCM2E88" },
1215 { "BCM2E89" },
1216 { "BCM2E8A" },
1217 { "BCM2E8B" },
1218 { "BCM2E8C" },
1219 { "BCM2E8D" },
1220 { "BCM2E8E" },
1221 { "BCM2E90" },
1222 { "BCM2E92" },
1223 { "BCM2E93" },
1224 { "BCM2E94" },
1225 { "BCM2E95" },
1226 { "BCM2E96" },
1227 { "BCM2E97" },
1228 { "BCM2E98" },
1229 { "BCM2E99" },
1230 { "BCM2E9A" },
1231 { "BCM2E9B" },
1232 { "BCM2E9C" },
1233 { "BCM2E9D" },
1234 { "BCM2EA0" },
1235 { "BCM2EA1" },
1236 { "BCM2EA2" },
1237 { "BCM2EA3" },
1238 { "BCM2EA4" },
1239 { "BCM2EA5" },
1240 { "BCM2EA6" },
1241 { "BCM2EA7" },
1242 { "BCM2EA8" },
1243 { "BCM2EA9" },
1244 { "BCM2EAA" },
1245 { "BCM2EAB" },
1246 { "BCM2EAC" },
1247 { },
1248 };
1249 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
1250 #endif
1251
1252 /* suspend and resume callbacks */
1253 static const struct dev_pm_ops bcm_pm_ops = {
1254 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
1255 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
1256 };
1257
1258 static struct platform_driver bcm_driver = {
1259 .probe = bcm_probe,
1260 .remove = bcm_remove,
1261 .driver = {
1262 .name = "hci_bcm",
1263 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1264 .pm = &bcm_pm_ops,
1265 },
1266 };
1267
1268 static int bcm_serdev_probe(struct serdev_device *serdev)
1269 {
1270 struct bcm_device *bcmdev;
1271 int err;
1272
1273 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
1274 if (!bcmdev)
1275 return -ENOMEM;
1276
1277 bcmdev->dev = &serdev->dev;
1278 #ifdef CONFIG_PM
1279 bcmdev->hu = &bcmdev->serdev_hu;
1280 #endif
1281 bcmdev->serdev_hu.serdev = serdev;
1282 serdev_device_set_drvdata(serdev, bcmdev);
1283
1284 if (has_acpi_companion(&serdev->dev))
1285 err = bcm_acpi_probe(bcmdev);
1286 else
1287 err = bcm_of_probe(bcmdev);
1288 if (err)
1289 return err;
1290
1291 err = bcm_get_resources(bcmdev);
1292 if (err)
1293 return err;
1294
1295 if (!bcmdev->shutdown) {
1296 dev_warn(&serdev->dev,
1297 "No reset resource, using default baud rate\n");
1298 bcmdev->oper_speed = bcmdev->init_speed;
1299 }
1300
1301 err = bcm_gpio_set_power(bcmdev, false);
1302 if (err)
1303 dev_err(&serdev->dev, "Failed to power down\n");
1304
1305 return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
1306 }
1307
1308 static void bcm_serdev_remove(struct serdev_device *serdev)
1309 {
1310 struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
1311
1312 hci_uart_unregister_device(&bcmdev->serdev_hu);
1313 }
1314
1315 #ifdef CONFIG_OF
1316 static const struct of_device_id bcm_bluetooth_of_match[] = {
1317 { .compatible = "brcm,bcm43438-bt" },
1318 { },
1319 };
1320 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
1321 #endif
1322
1323 static struct serdev_device_driver bcm_serdev_driver = {
1324 .probe = bcm_serdev_probe,
1325 .remove = bcm_serdev_remove,
1326 .driver = {
1327 .name = "hci_uart_bcm",
1328 .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
1329 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1330 .pm = &bcm_pm_ops,
1331 },
1332 };
1333
1334 int __init bcm_init(void)
1335 {
1336 /* For now, we need to keep both platform device
1337 * driver (ACPI generated) and serdev driver (DT).
1338 */
1339 platform_driver_register(&bcm_driver);
1340 serdev_device_driver_register(&bcm_serdev_driver);
1341
1342 return hci_uart_register_proto(&bcm_proto);
1343 }
1344
1345 int __exit bcm_deinit(void)
1346 {
1347 platform_driver_unregister(&bcm_driver);
1348 serdev_device_driver_unregister(&bcm_serdev_driver);
1349
1350 return hci_uart_unregister_proto(&bcm_proto);
1351 }
Linux with added FPC-III support