Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Bluetooth HCI UART driver for Broadcom devices
5 *
6 * Copyright (C) 2015 Intel Corporation
7 */
8
9#include <linux/kernel.h>
10#include <linux/errno.h>
11#include <linux/skbuff.h>
12#include <linux/firmware.h>
13#include <linux/module.h>
14#include <linux/acpi.h>
15#include <linux/of.h>
16#include <linux/of_irq.h>
17#include <linux/property.h>
18#include <linux/platform_data/x86/apple.h>
19#include <linux/platform_device.h>
20#include <linux/regulator/consumer.h>
21#include <linux/clk.h>
22#include <linux/gpio/consumer.h>
23#include <linux/tty.h>
24#include <linux/interrupt.h>
25#include <linux/dmi.h>
26#include <linux/pm_runtime.h>
27#include <linux/serdev.h>
28
29#include <net/bluetooth/bluetooth.h>
30#include <net/bluetooth/hci_core.h>
31
32#include "btbcm.h"
33#include "hci_uart.h"
34
35#define BCM_NULL_PKT 0x00
36#define BCM_NULL_SIZE 0
37
38#define BCM_LM_DIAG_PKT 0x07
39#define BCM_LM_DIAG_SIZE 63
40
41#define BCM_TYPE49_PKT 0x31
42#define BCM_TYPE49_SIZE 0
43
44#define BCM_TYPE52_PKT 0x34
45#define BCM_TYPE52_SIZE 0
46
47#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
48
49#define BCM_NUM_SUPPLIES 2
50
51/**
52 * struct bcm_device_data - device specific data
53 * @no_early_set_baudrate: Disallow set baudrate before driver setup()
54 */
55struct bcm_device_data {
56 bool no_early_set_baudrate;
57 bool drive_rts_on_open;
58};
59
60/**
61 * struct bcm_device - device driver resources
62 * @serdev_hu: HCI UART controller struct
63 * @list: bcm_device_list node
64 * @dev: physical UART slave
65 * @name: device name logged by bt_dev_*() functions
66 * @device_wakeup: BT_WAKE pin,
67 * assert = Bluetooth device must wake up or remain awake,
68 * deassert = Bluetooth device may sleep when sleep criteria are met
69 * @shutdown: BT_REG_ON pin,
70 * power up or power down Bluetooth device internal regulators
71 * @set_device_wakeup: callback to toggle BT_WAKE pin
72 * either by accessing @device_wakeup or by calling @btlp
73 * @set_shutdown: callback to toggle BT_REG_ON pin
74 * either by accessing @shutdown or by calling @btpu/@btpd
75 * @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power")
76 * @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up")
77 * @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down")
78 * @txco_clk: external reference frequency clock used by Bluetooth device
79 * @lpo_clk: external LPO clock used by Bluetooth device
80 * @supplies: VBAT and VDDIO supplies used by Bluetooth device
81 * @res_enabled: whether clocks and supplies are prepared and enabled
82 * @init_speed: default baudrate of Bluetooth device;
83 * the host UART is initially set to this baudrate so that
84 * it can configure the Bluetooth device for @oper_speed
85 * @oper_speed: preferred baudrate of Bluetooth device;
86 * set to 0 if @init_speed is already the preferred baudrate
87 * @irq: interrupt triggered by HOST_WAKE_BT pin
88 * @irq_active_low: whether @irq is active low
89 * @hu: pointer to HCI UART controller struct,
90 * used to disable flow control during runtime suspend and system sleep
91 * @is_suspended: whether flow control is currently disabled
92 * @no_early_set_baudrate: don't set_baudrate before setup()
93 */
94struct bcm_device {
95 /* Must be the first member, hci_serdev.c expects this. */
96 struct hci_uart serdev_hu;
97 struct list_head list;
98
99 struct device *dev;
100
101 const char *name;
102 struct gpio_desc *device_wakeup;
103 struct gpio_desc *shutdown;
104 int (*set_device_wakeup)(struct bcm_device *, bool);
105 int (*set_shutdown)(struct bcm_device *, bool);
106#ifdef CONFIG_ACPI
107 acpi_handle btlp, btpu, btpd;
108 int gpio_count;
109 int gpio_int_idx;
110#endif
111
112 struct clk *txco_clk;
113 struct clk *lpo_clk;
114 struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES];
115 bool res_enabled;
116
117 u32 init_speed;
118 u32 oper_speed;
119 int irq;
120 bool irq_active_low;
121 bool irq_acquired;
122
123#ifdef CONFIG_PM
124 struct hci_uart *hu;
125 bool is_suspended;
126#endif
127 bool no_early_set_baudrate;
128 bool drive_rts_on_open;
129 u8 pcm_int_params[5];
130};
131
132/* generic bcm uart resources */
133struct bcm_data {
134 struct sk_buff *rx_skb;
135 struct sk_buff_head txq;
136
137 struct bcm_device *dev;
138};
139
140/* List of BCM BT UART devices */
141static DEFINE_MUTEX(bcm_device_lock);
142static LIST_HEAD(bcm_device_list);
143
144static int irq_polarity = -1;
145module_param(irq_polarity, int, 0444);
146MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");
147
148static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
149{
150 if (hu->serdev)
151 serdev_device_set_baudrate(hu->serdev, speed);
152 else
153 hci_uart_set_baudrate(hu, speed);
154}
155
156static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
157{
158 struct hci_dev *hdev = hu->hdev;
159 struct sk_buff *skb;
160 struct bcm_update_uart_baud_rate param;
161
162 if (speed > 3000000) {
163 struct bcm_write_uart_clock_setting clock;
164
165 clock.type = BCM_UART_CLOCK_48MHZ;
166
167 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
168
169 /* This Broadcom specific command changes the UART's controller
170 * clock for baud rate > 3000000.
171 */
172 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
173 if (IS_ERR(skb)) {
174 int err = PTR_ERR(skb);
175 bt_dev_err(hdev, "BCM: failed to write clock (%d)",
176 err);
177 return err;
178 }
179
180 kfree_skb(skb);
181 }
182
183 bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
184
185 param.zero = cpu_to_le16(0);
186 param.baud_rate = cpu_to_le32(speed);
187
188 /* This Broadcom specific command changes the UART's controller baud
189 * rate.
190 */
191 skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), ¶m,
192 HCI_INIT_TIMEOUT);
193 if (IS_ERR(skb)) {
194 int err = PTR_ERR(skb);
195 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
196 err);
197 return err;
198 }
199
200 kfree_skb(skb);
201
202 return 0;
203}
204
205/* bcm_device_exists should be protected by bcm_device_lock */
206static bool bcm_device_exists(struct bcm_device *device)
207{
208 struct list_head *p;
209
210#ifdef CONFIG_PM
211 /* Devices using serdev always exist */
212 if (device && device->hu && device->hu->serdev)
213 return true;
214#endif
215
216 list_for_each(p, &bcm_device_list) {
217 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
218
219 if (device == dev)
220 return true;
221 }
222
223 return false;
224}
225
226static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
227{
228 int err;
229
230 if (powered && !dev->res_enabled) {
231 /* Intel Macs use bcm_apple_get_resources() and don't
232 * have regulator supplies configured.
233 */
234 if (dev->supplies[0].supply) {
235 err = regulator_bulk_enable(BCM_NUM_SUPPLIES,
236 dev->supplies);
237 if (err)
238 return err;
239 }
240
241 /* LPO clock needs to be 32.768 kHz */
242 err = clk_set_rate(dev->lpo_clk, 32768);
243 if (err) {
244 dev_err(dev->dev, "Could not set LPO clock rate\n");
245 goto err_regulator_disable;
246 }
247
248 err = clk_prepare_enable(dev->lpo_clk);
249 if (err)
250 goto err_regulator_disable;
251
252 err = clk_prepare_enable(dev->txco_clk);
253 if (err)
254 goto err_lpo_clk_disable;
255 }
256
257 err = dev->set_shutdown(dev, powered);
258 if (err)
259 goto err_txco_clk_disable;
260
261 err = dev->set_device_wakeup(dev, powered);
262 if (err)
263 goto err_revert_shutdown;
264
265 if (!powered && dev->res_enabled) {
266 clk_disable_unprepare(dev->txco_clk);
267 clk_disable_unprepare(dev->lpo_clk);
268
269 /* Intel Macs use bcm_apple_get_resources() and don't
270 * have regulator supplies configured.
271 */
272 if (dev->supplies[0].supply)
273 regulator_bulk_disable(BCM_NUM_SUPPLIES,
274 dev->supplies);
275 }
276
277 /* wait for device to power on and come out of reset */
278 usleep_range(100000, 120000);
279
280 dev->res_enabled = powered;
281
282 return 0;
283
284err_revert_shutdown:
285 dev->set_shutdown(dev, !powered);
286err_txco_clk_disable:
287 if (powered && !dev->res_enabled)
288 clk_disable_unprepare(dev->txco_clk);
289err_lpo_clk_disable:
290 if (powered && !dev->res_enabled)
291 clk_disable_unprepare(dev->lpo_clk);
292err_regulator_disable:
293 if (powered && !dev->res_enabled)
294 regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies);
295 return err;
296}
297
298#ifdef CONFIG_PM
299static irqreturn_t bcm_host_wake(int irq, void *data)
300{
301 struct bcm_device *bdev = data;
302
303 bt_dev_dbg(bdev, "Host wake IRQ");
304
305 pm_runtime_get(bdev->dev);
306 pm_runtime_mark_last_busy(bdev->dev);
307 pm_runtime_put_autosuspend(bdev->dev);
308
309 return IRQ_HANDLED;
310}
311
312static int bcm_request_irq(struct bcm_data *bcm)
313{
314 struct bcm_device *bdev = bcm->dev;
315 int err;
316
317 mutex_lock(&bcm_device_lock);
318 if (!bcm_device_exists(bdev)) {
319 err = -ENODEV;
320 goto unlock;
321 }
322
323 if (bdev->irq <= 0) {
324 err = -EOPNOTSUPP;
325 goto unlock;
326 }
327
328 err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake,
329 bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
330 IRQF_TRIGGER_RISING,
331 "host_wake", bdev);
332 if (err) {
333 bdev->irq = err;
334 goto unlock;
335 }
336
337 bdev->irq_acquired = true;
338
339 device_init_wakeup(bdev->dev, true);
340
341 pm_runtime_set_autosuspend_delay(bdev->dev,
342 BCM_AUTOSUSPEND_DELAY);
343 pm_runtime_use_autosuspend(bdev->dev);
344 pm_runtime_set_active(bdev->dev);
345 pm_runtime_enable(bdev->dev);
346
347unlock:
348 mutex_unlock(&bcm_device_lock);
349
350 return err;
351}
352
353static const struct bcm_set_sleep_mode default_sleep_params = {
354 .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
355 .idle_host = 2, /* idle threshold HOST, in 300ms */
356 .idle_dev = 2, /* idle threshold device, in 300ms */
357 .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */
358 .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */
359 .allow_host_sleep = 1, /* Allow host sleep in SCO flag */
360 .combine_modes = 1, /* Combine sleep and LPM flag */
361 .tristate_control = 0, /* Allow tri-state control of UART tx flag */
362 /* Irrelevant USB flags */
363 .usb_auto_sleep = 0,
364 .usb_resume_timeout = 0,
365 .break_to_host = 0,
366 .pulsed_host_wake = 1,
367};
368
369static int bcm_setup_sleep(struct hci_uart *hu)
370{
371 struct bcm_data *bcm = hu->priv;
372 struct sk_buff *skb;
373 struct bcm_set_sleep_mode sleep_params = default_sleep_params;
374
375 sleep_params.host_wake_active = !bcm->dev->irq_active_low;
376
377 skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
378 &sleep_params, HCI_INIT_TIMEOUT);
379 if (IS_ERR(skb)) {
380 int err = PTR_ERR(skb);
381 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
382 return err;
383 }
384 kfree_skb(skb);
385
386 bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
387
388 return 0;
389}
390#else
391static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
392static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
393#endif
394
395static int bcm_set_diag(struct hci_dev *hdev, bool enable)
396{
397 struct hci_uart *hu = hci_get_drvdata(hdev);
398 struct bcm_data *bcm = hu->priv;
399 struct sk_buff *skb;
400
401 if (!test_bit(HCI_RUNNING, &hdev->flags))
402 return -ENETDOWN;
403
404 skb = bt_skb_alloc(3, GFP_KERNEL);
405 if (!skb)
406 return -ENOMEM;
407
408 skb_put_u8(skb, BCM_LM_DIAG_PKT);
409 skb_put_u8(skb, 0xf0);
410 skb_put_u8(skb, enable);
411
412 skb_queue_tail(&bcm->txq, skb);
413 hci_uart_tx_wakeup(hu);
414
415 return 0;
416}
417
418static int bcm_open(struct hci_uart *hu)
419{
420 struct bcm_data *bcm;
421 struct list_head *p;
422 int err;
423
424 bt_dev_dbg(hu->hdev, "hu %p", hu);
425
426 if (!hci_uart_has_flow_control(hu))
427 return -EOPNOTSUPP;
428
429 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
430 if (!bcm)
431 return -ENOMEM;
432
433 skb_queue_head_init(&bcm->txq);
434
435 hu->priv = bcm;
436
437 mutex_lock(&bcm_device_lock);
438
439 if (hu->serdev) {
440 bcm->dev = serdev_device_get_drvdata(hu->serdev);
441 goto out;
442 }
443
444 if (!hu->tty->dev)
445 goto out;
446
447 list_for_each(p, &bcm_device_list) {
448 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
449
450 /* Retrieve saved bcm_device based on parent of the
451 * platform device (saved during device probe) and
452 * parent of tty device used by hci_uart
453 */
454 if (hu->tty->dev->parent == dev->dev->parent) {
455 bcm->dev = dev;
456#ifdef CONFIG_PM
457 dev->hu = hu;
458#endif
459 break;
460 }
461 }
462
463out:
464 if (bcm->dev) {
465 if (bcm->dev->drive_rts_on_open)
466 hci_uart_set_flow_control(hu, true);
467
468 hu->init_speed = bcm->dev->init_speed;
469
470 /* If oper_speed is set, ldisc/serdev will set the baudrate
471 * before calling setup()
472 */
473 if (!bcm->dev->no_early_set_baudrate)
474 hu->oper_speed = bcm->dev->oper_speed;
475
476 err = bcm_gpio_set_power(bcm->dev, true);
477
478 if (bcm->dev->drive_rts_on_open)
479 hci_uart_set_flow_control(hu, false);
480
481 if (err)
482 goto err_unset_hu;
483 }
484
485 mutex_unlock(&bcm_device_lock);
486 return 0;
487
488err_unset_hu:
489#ifdef CONFIG_PM
490 if (!hu->serdev)
491 bcm->dev->hu = NULL;
492#endif
493 mutex_unlock(&bcm_device_lock);
494 hu->priv = NULL;
495 kfree(bcm);
496 return err;
497}
498
499static int bcm_close(struct hci_uart *hu)
500{
501 struct bcm_data *bcm = hu->priv;
502 struct bcm_device *bdev = NULL;
503 int err;
504
505 bt_dev_dbg(hu->hdev, "hu %p", hu);
506
507 /* Protect bcm->dev against removal of the device or driver */
508 mutex_lock(&bcm_device_lock);
509
510 if (hu->serdev) {
511 bdev = serdev_device_get_drvdata(hu->serdev);
512 } else if (bcm_device_exists(bcm->dev)) {
513 bdev = bcm->dev;
514#ifdef CONFIG_PM
515 bdev->hu = NULL;
516#endif
517 }
518
519 if (bdev) {
520 if (IS_ENABLED(CONFIG_PM) && bdev->irq_acquired) {
521 devm_free_irq(bdev->dev, bdev->irq, bdev);
522 device_init_wakeup(bdev->dev, false);
523 pm_runtime_disable(bdev->dev);
524 }
525
526 err = bcm_gpio_set_power(bdev, false);
527 if (err)
528 bt_dev_err(hu->hdev, "Failed to power down");
529 else
530 pm_runtime_set_suspended(bdev->dev);
531 }
532 mutex_unlock(&bcm_device_lock);
533
534 skb_queue_purge(&bcm->txq);
535 kfree_skb(bcm->rx_skb);
536 kfree(bcm);
537
538 hu->priv = NULL;
539 return 0;
540}
541
542static int bcm_flush(struct hci_uart *hu)
543{
544 struct bcm_data *bcm = hu->priv;
545
546 bt_dev_dbg(hu->hdev, "hu %p", hu);
547
548 skb_queue_purge(&bcm->txq);
549
550 return 0;
551}
552
553static int bcm_setup(struct hci_uart *hu)
554{
555 struct bcm_data *bcm = hu->priv;
556 bool fw_load_done = false;
557 unsigned int speed;
558 int err;
559
560 bt_dev_dbg(hu->hdev, "hu %p", hu);
561
562 hu->hdev->set_diag = bcm_set_diag;
563 hu->hdev->set_bdaddr = btbcm_set_bdaddr;
564
565 err = btbcm_initialize(hu->hdev, &fw_load_done);
566 if (err)
567 return err;
568
569 if (!fw_load_done)
570 return 0;
571
572 /* Init speed if any */
573 if (hu->init_speed)
574 speed = hu->init_speed;
575 else if (hu->proto->init_speed)
576 speed = hu->proto->init_speed;
577 else
578 speed = 0;
579
580 if (speed)
581 host_set_baudrate(hu, speed);
582
583 /* Operational speed if any */
584 if (hu->oper_speed)
585 speed = hu->oper_speed;
586 else if (bcm->dev && bcm->dev->oper_speed)
587 speed = bcm->dev->oper_speed;
588 else if (hu->proto->oper_speed)
589 speed = hu->proto->oper_speed;
590 else
591 speed = 0;
592
593 if (speed) {
594 err = bcm_set_baudrate(hu, speed);
595 if (!err)
596 host_set_baudrate(hu, speed);
597 }
598
599 /* PCM parameters if provided */
600 if (bcm->dev && bcm->dev->pcm_int_params[0] != 0xff) {
601 struct bcm_set_pcm_int_params params;
602
603 btbcm_read_pcm_int_params(hu->hdev, ¶ms);
604
605 memcpy(¶ms, bcm->dev->pcm_int_params, 5);
606 btbcm_write_pcm_int_params(hu->hdev, ¶ms);
607 }
608
609 err = btbcm_finalize(hu->hdev, &fw_load_done);
610 if (err)
611 return err;
612
613 /* Some devices ship with the controller default address.
614 * Allow the bootloader to set a valid address through the
615 * device tree.
616 */
617 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hu->hdev->quirks);
618
619 if (!bcm_request_irq(bcm))
620 err = bcm_setup_sleep(hu);
621
622 return err;
623}
624
625#define BCM_RECV_LM_DIAG \
626 .type = BCM_LM_DIAG_PKT, \
627 .hlen = BCM_LM_DIAG_SIZE, \
628 .loff = 0, \
629 .lsize = 0, \
630 .maxlen = BCM_LM_DIAG_SIZE
631
632#define BCM_RECV_NULL \
633 .type = BCM_NULL_PKT, \
634 .hlen = BCM_NULL_SIZE, \
635 .loff = 0, \
636 .lsize = 0, \
637 .maxlen = BCM_NULL_SIZE
638
639#define BCM_RECV_TYPE49 \
640 .type = BCM_TYPE49_PKT, \
641 .hlen = BCM_TYPE49_SIZE, \
642 .loff = 0, \
643 .lsize = 0, \
644 .maxlen = BCM_TYPE49_SIZE
645
646#define BCM_RECV_TYPE52 \
647 .type = BCM_TYPE52_PKT, \
648 .hlen = BCM_TYPE52_SIZE, \
649 .loff = 0, \
650 .lsize = 0, \
651 .maxlen = BCM_TYPE52_SIZE
652
653static const struct h4_recv_pkt bcm_recv_pkts[] = {
654 { H4_RECV_ACL, .recv = hci_recv_frame },
655 { H4_RECV_SCO, .recv = hci_recv_frame },
656 { H4_RECV_EVENT, .recv = hci_recv_frame },
657 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag },
658 { BCM_RECV_NULL, .recv = hci_recv_diag },
659 { BCM_RECV_TYPE49, .recv = hci_recv_diag },
660 { BCM_RECV_TYPE52, .recv = hci_recv_diag },
661};
662
663static int bcm_recv(struct hci_uart *hu, const void *data, int count)
664{
665 struct bcm_data *bcm = hu->priv;
666
667 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
668 return -EUNATCH;
669
670 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
671 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
672 if (IS_ERR(bcm->rx_skb)) {
673 int err = PTR_ERR(bcm->rx_skb);
674 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
675 bcm->rx_skb = NULL;
676 return err;
677 } else if (!bcm->rx_skb) {
678 /* Delay auto-suspend when receiving completed packet */
679 mutex_lock(&bcm_device_lock);
680 if (bcm->dev && bcm_device_exists(bcm->dev)) {
681 pm_runtime_get(bcm->dev->dev);
682 pm_runtime_mark_last_busy(bcm->dev->dev);
683 pm_runtime_put_autosuspend(bcm->dev->dev);
684 }
685 mutex_unlock(&bcm_device_lock);
686 }
687
688 return count;
689}
690
691static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
692{
693 struct bcm_data *bcm = hu->priv;
694
695 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
696
697 /* Prepend skb with frame type */
698 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
699 skb_queue_tail(&bcm->txq, skb);
700
701 return 0;
702}
703
704static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
705{
706 struct bcm_data *bcm = hu->priv;
707 struct sk_buff *skb = NULL;
708 struct bcm_device *bdev = NULL;
709
710 mutex_lock(&bcm_device_lock);
711
712 if (bcm_device_exists(bcm->dev)) {
713 bdev = bcm->dev;
714 pm_runtime_get_sync(bdev->dev);
715 /* Shall be resumed here */
716 }
717
718 skb = skb_dequeue(&bcm->txq);
719
720 if (bdev) {
721 pm_runtime_mark_last_busy(bdev->dev);
722 pm_runtime_put_autosuspend(bdev->dev);
723 }
724
725 mutex_unlock(&bcm_device_lock);
726
727 return skb;
728}
729
730#ifdef CONFIG_PM
731static int bcm_suspend_device(struct device *dev)
732{
733 struct bcm_device *bdev = dev_get_drvdata(dev);
734 int err;
735
736 bt_dev_dbg(bdev, "");
737
738 if (!bdev->is_suspended && bdev->hu) {
739 hci_uart_set_flow_control(bdev->hu, true);
740
741 /* Once this returns, driver suspends BT via GPIO */
742 bdev->is_suspended = true;
743 }
744
745 /* Suspend the device */
746 err = bdev->set_device_wakeup(bdev, false);
747 if (err) {
748 if (bdev->is_suspended && bdev->hu) {
749 bdev->is_suspended = false;
750 hci_uart_set_flow_control(bdev->hu, false);
751 }
752 return -EBUSY;
753 }
754
755 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
756 msleep(15);
757
758 return 0;
759}
760
761static int bcm_resume_device(struct device *dev)
762{
763 struct bcm_device *bdev = dev_get_drvdata(dev);
764 int err;
765
766 bt_dev_dbg(bdev, "");
767
768 err = bdev->set_device_wakeup(bdev, true);
769 if (err) {
770 dev_err(dev, "Failed to power up\n");
771 return err;
772 }
773
774 bt_dev_dbg(bdev, "resume, delaying 15 ms");
775 msleep(15);
776
777 /* When this executes, the device has woken up already */
778 if (bdev->is_suspended && bdev->hu) {
779 bdev->is_suspended = false;
780
781 hci_uart_set_flow_control(bdev->hu, false);
782 }
783
784 return 0;
785}
786#endif
787
788#ifdef CONFIG_PM_SLEEP
789/* suspend callback */
790static int bcm_suspend(struct device *dev)
791{
792 struct bcm_device *bdev = dev_get_drvdata(dev);
793 int error;
794
795 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
796
797 /*
798 * When used with a device instantiated as platform_device, bcm_suspend
799 * can be called at any time as long as the platform device is bound,
800 * so it should use bcm_device_lock to protect access to hci_uart
801 * and device_wake-up GPIO.
802 */
803 mutex_lock(&bcm_device_lock);
804
805 if (!bdev->hu)
806 goto unlock;
807
808 if (pm_runtime_active(dev))
809 bcm_suspend_device(dev);
810
811 if (device_may_wakeup(dev) && bdev->irq > 0) {
812 error = enable_irq_wake(bdev->irq);
813 if (!error)
814 bt_dev_dbg(bdev, "BCM irq: enabled");
815 }
816
817unlock:
818 mutex_unlock(&bcm_device_lock);
819
820 return 0;
821}
822
823/* resume callback */
824static int bcm_resume(struct device *dev)
825{
826 struct bcm_device *bdev = dev_get_drvdata(dev);
827 int err = 0;
828
829 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
830
831 /*
832 * When used with a device instantiated as platform_device, bcm_resume
833 * can be called at any time as long as platform device is bound,
834 * so it should use bcm_device_lock to protect access to hci_uart
835 * and device_wake-up GPIO.
836 */
837 mutex_lock(&bcm_device_lock);
838
839 if (!bdev->hu)
840 goto unlock;
841
842 if (device_may_wakeup(dev) && bdev->irq > 0) {
843 disable_irq_wake(bdev->irq);
844 bt_dev_dbg(bdev, "BCM irq: disabled");
845 }
846
847 err = bcm_resume_device(dev);
848
849unlock:
850 mutex_unlock(&bcm_device_lock);
851
852 if (!err) {
853 pm_runtime_disable(dev);
854 pm_runtime_set_active(dev);
855 pm_runtime_enable(dev);
856 }
857
858 return 0;
859}
860#endif
861
862/* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
863static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
864 {
865 .ident = "Meegopad T08",
866 .matches = {
867 DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
868 "To be filled by OEM."),
869 DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
870 DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
871 },
872 },
873 { }
874};
875
876#ifdef CONFIG_ACPI
877static const struct acpi_gpio_params first_gpio = { 0, 0, false };
878static const struct acpi_gpio_params second_gpio = { 1, 0, false };
879static const struct acpi_gpio_params third_gpio = { 2, 0, false };
880
881static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
882 { "device-wakeup-gpios", &first_gpio, 1 },
883 { "shutdown-gpios", &second_gpio, 1 },
884 { "host-wakeup-gpios", &third_gpio, 1 },
885 { },
886};
887
888static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
889 { "host-wakeup-gpios", &first_gpio, 1 },
890 { "device-wakeup-gpios", &second_gpio, 1 },
891 { "shutdown-gpios", &third_gpio, 1 },
892 { },
893};
894
895static int bcm_resource(struct acpi_resource *ares, void *data)
896{
897 struct bcm_device *dev = data;
898 struct acpi_resource_extended_irq *irq;
899 struct acpi_resource_gpio *gpio;
900 struct acpi_resource_uart_serialbus *sb;
901
902 switch (ares->type) {
903 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
904 irq = &ares->data.extended_irq;
905 if (irq->polarity != ACPI_ACTIVE_LOW)
906 dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
907 dev->irq_active_low = true;
908 break;
909
910 case ACPI_RESOURCE_TYPE_GPIO:
911 gpio = &ares->data.gpio;
912 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
913 dev->gpio_int_idx = dev->gpio_count;
914 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
915 }
916 dev->gpio_count++;
917 break;
918
919 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
920 sb = &ares->data.uart_serial_bus;
921 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
922 dev->init_speed = sb->default_baud_rate;
923 dev->oper_speed = 4000000;
924 }
925 break;
926
927 default:
928 break;
929 }
930
931 return 0;
932}
933
934static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
935{
936 if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
937 return -EIO;
938
939 return 0;
940}
941
942static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
943{
944 if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
945 NULL, NULL, NULL)))
946 return -EIO;
947
948 return 0;
949}
950
951static int bcm_apple_get_resources(struct bcm_device *dev)
952{
953 struct acpi_device *adev = ACPI_COMPANION(dev->dev);
954 const union acpi_object *obj;
955
956 if (!adev ||
957 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
958 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
959 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
960 return -ENODEV;
961
962 if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
963 obj->buffer.length == 8)
964 dev->init_speed = *(u64 *)obj->buffer.pointer;
965
966 dev->set_device_wakeup = bcm_apple_set_device_wakeup;
967 dev->set_shutdown = bcm_apple_set_shutdown;
968
969 return 0;
970}
971#else
972static inline int bcm_apple_get_resources(struct bcm_device *dev)
973{
974 return -EOPNOTSUPP;
975}
976#endif /* CONFIG_ACPI */
977
978static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
979{
980 gpiod_set_value_cansleep(dev->device_wakeup, awake);
981 return 0;
982}
983
984static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
985{
986 gpiod_set_value_cansleep(dev->shutdown, powered);
987 return 0;
988}
989
990/* Try a bunch of names for TXCO */
991static struct clk *bcm_get_txco(struct device *dev)
992{
993 struct clk *clk;
994
995 /* New explicit name */
996 clk = devm_clk_get(dev, "txco");
997 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
998 return clk;
999
1000 /* Deprecated name */
1001 clk = devm_clk_get(dev, "extclk");
1002 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
1003 return clk;
1004
1005 /* Original code used no name at all */
1006 return devm_clk_get(dev, NULL);
1007}
1008
1009static int bcm_get_resources(struct bcm_device *dev)
1010{
1011 const struct dmi_system_id *dmi_id;
1012 int err;
1013
1014 dev->name = dev_name(dev->dev);
1015
1016 if (x86_apple_machine && !bcm_apple_get_resources(dev))
1017 return 0;
1018
1019 dev->txco_clk = bcm_get_txco(dev->dev);
1020
1021 /* Handle deferred probing */
1022 if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER))
1023 return PTR_ERR(dev->txco_clk);
1024
1025 /* Ignore all other errors as before */
1026 if (IS_ERR(dev->txco_clk))
1027 dev->txco_clk = NULL;
1028
1029 dev->lpo_clk = devm_clk_get(dev->dev, "lpo");
1030 if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER))
1031 return PTR_ERR(dev->lpo_clk);
1032
1033 if (IS_ERR(dev->lpo_clk))
1034 dev->lpo_clk = NULL;
1035
1036 /* Check if we accidentally fetched the lpo clock twice */
1037 if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) {
1038 devm_clk_put(dev->dev, dev->txco_clk);
1039 dev->txco_clk = NULL;
1040 }
1041
1042 dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
1043 GPIOD_OUT_LOW);
1044 if (IS_ERR(dev->device_wakeup))
1045 return PTR_ERR(dev->device_wakeup);
1046
1047 dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
1048 GPIOD_OUT_LOW);
1049 if (IS_ERR(dev->shutdown))
1050 return PTR_ERR(dev->shutdown);
1051
1052 dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
1053 dev->set_shutdown = bcm_gpio_set_shutdown;
1054
1055 dev->supplies[0].supply = "vbat";
1056 dev->supplies[1].supply = "vddio";
1057 err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
1058 dev->supplies);
1059 if (err)
1060 return err;
1061
1062 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
1063 if (dev->irq <= 0) {
1064 struct gpio_desc *gpio;
1065
1066 gpio = devm_gpiod_get_optional(dev->dev, "host-wakeup",
1067 GPIOD_IN);
1068 if (IS_ERR(gpio))
1069 return PTR_ERR(gpio);
1070
1071 dev->irq = gpiod_to_irq(gpio);
1072 }
1073
1074 dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
1075 if (dmi_id) {
1076 dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
1077 dmi_id->ident);
1078 dev->irq = 0;
1079 }
1080
1081 dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
1082 return 0;
1083}
1084
1085#ifdef CONFIG_ACPI
1086static int bcm_acpi_probe(struct bcm_device *dev)
1087{
1088 LIST_HEAD(resources);
1089 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
1090 struct resource_entry *entry;
1091 int ret;
1092
1093 /* Retrieve UART ACPI info */
1094 dev->gpio_int_idx = -1;
1095 ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
1096 &resources, bcm_resource, dev);
1097 if (ret < 0)
1098 return ret;
1099
1100 resource_list_for_each_entry(entry, &resources) {
1101 if (resource_type(entry->res) == IORESOURCE_IRQ) {
1102 dev->irq = entry->res->start;
1103 break;
1104 }
1105 }
1106 acpi_dev_free_resource_list(&resources);
1107
1108 /* If the DSDT uses an Interrupt resource for the IRQ, then there are
1109 * only 2 GPIO resources, we use the irq-last mapping for this, since
1110 * we already have an irq the 3th / last mapping will not be used.
1111 */
1112 if (dev->irq)
1113 gpio_mapping = acpi_bcm_int_last_gpios;
1114 else if (dev->gpio_int_idx == 0)
1115 gpio_mapping = acpi_bcm_int_first_gpios;
1116 else if (dev->gpio_int_idx == 2)
1117 gpio_mapping = acpi_bcm_int_last_gpios;
1118 else
1119 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
1120 dev->gpio_int_idx);
1121
1122 /* Warn if our expectations are not met. */
1123 if (dev->gpio_count != (dev->irq ? 2 : 3))
1124 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
1125 dev->gpio_count);
1126
1127 ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
1128 if (ret)
1129 return ret;
1130
1131 if (irq_polarity != -1) {
1132 dev->irq_active_low = irq_polarity;
1133 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
1134 dev->irq_active_low ? "low" : "high");
1135 }
1136
1137 return 0;
1138}
1139#else
1140static int bcm_acpi_probe(struct bcm_device *dev)
1141{
1142 return -EINVAL;
1143}
1144#endif /* CONFIG_ACPI */
1145
1146static int bcm_of_probe(struct bcm_device *bdev)
1147{
1148 device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
1149 device_property_read_u8_array(bdev->dev, "brcm,bt-pcm-int-params",
1150 bdev->pcm_int_params, 5);
1151 bdev->irq = of_irq_get_byname(bdev->dev->of_node, "host-wakeup");
1152 bdev->irq_active_low = irq_get_trigger_type(bdev->irq)
1153 & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW);
1154 return 0;
1155}
1156
1157static int bcm_probe(struct platform_device *pdev)
1158{
1159 struct bcm_device *dev;
1160 int ret;
1161
1162 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1163 if (!dev)
1164 return -ENOMEM;
1165
1166 dev->dev = &pdev->dev;
1167 dev->irq = platform_get_irq(pdev, 0);
1168
1169 /* Initialize routing field to an unused value */
1170 dev->pcm_int_params[0] = 0xff;
1171
1172 if (has_acpi_companion(&pdev->dev)) {
1173 ret = bcm_acpi_probe(dev);
1174 if (ret)
1175 return ret;
1176 }
1177
1178 ret = bcm_get_resources(dev);
1179 if (ret)
1180 return ret;
1181
1182 platform_set_drvdata(pdev, dev);
1183
1184 dev_info(&pdev->dev, "%s device registered.\n", dev->name);
1185
1186 /* Place this instance on the device list */
1187 mutex_lock(&bcm_device_lock);
1188 list_add_tail(&dev->list, &bcm_device_list);
1189 mutex_unlock(&bcm_device_lock);
1190
1191 ret = bcm_gpio_set_power(dev, false);
1192 if (ret)
1193 dev_err(&pdev->dev, "Failed to power down\n");
1194
1195 return 0;
1196}
1197
1198static int bcm_remove(struct platform_device *pdev)
1199{
1200 struct bcm_device *dev = platform_get_drvdata(pdev);
1201
1202 mutex_lock(&bcm_device_lock);
1203 list_del(&dev->list);
1204 mutex_unlock(&bcm_device_lock);
1205
1206 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
1207
1208 return 0;
1209}
1210
1211static const struct hci_uart_proto bcm_proto = {
1212 .id = HCI_UART_BCM,
1213 .name = "Broadcom",
1214 .manufacturer = 15,
1215 .init_speed = 115200,
1216 .open = bcm_open,
1217 .close = bcm_close,
1218 .flush = bcm_flush,
1219 .setup = bcm_setup,
1220 .set_baudrate = bcm_set_baudrate,
1221 .recv = bcm_recv,
1222 .enqueue = bcm_enqueue,
1223 .dequeue = bcm_dequeue,
1224};
1225
1226#ifdef CONFIG_ACPI
1227static const struct acpi_device_id bcm_acpi_match[] = {
1228 { "BCM2E00" },
1229 { "BCM2E01" },
1230 { "BCM2E02" },
1231 { "BCM2E03" },
1232 { "BCM2E04" },
1233 { "BCM2E05" },
1234 { "BCM2E06" },
1235 { "BCM2E07" },
1236 { "BCM2E08" },
1237 { "BCM2E09" },
1238 { "BCM2E0A" },
1239 { "BCM2E0B" },
1240 { "BCM2E0C" },
1241 { "BCM2E0D" },
1242 { "BCM2E0E" },
1243 { "BCM2E0F" },
1244 { "BCM2E10" },
1245 { "BCM2E11" },
1246 { "BCM2E12" },
1247 { "BCM2E13" },
1248 { "BCM2E14" },
1249 { "BCM2E15" },
1250 { "BCM2E16" },
1251 { "BCM2E17" },
1252 { "BCM2E18" },
1253 { "BCM2E19" },
1254 { "BCM2E1A" },
1255 { "BCM2E1B" },
1256 { "BCM2E1C" },
1257 { "BCM2E1D" },
1258 { "BCM2E1F" },
1259 { "BCM2E20" },
1260 { "BCM2E21" },
1261 { "BCM2E22" },
1262 { "BCM2E23" },
1263 { "BCM2E24" },
1264 { "BCM2E25" },
1265 { "BCM2E26" },
1266 { "BCM2E27" },
1267 { "BCM2E28" },
1268 { "BCM2E29" },
1269 { "BCM2E2A" },
1270 { "BCM2E2B" },
1271 { "BCM2E2C" },
1272 { "BCM2E2D" },
1273 { "BCM2E2E" },
1274 { "BCM2E2F" },
1275 { "BCM2E30" },
1276 { "BCM2E31" },
1277 { "BCM2E32" },
1278 { "BCM2E33" },
1279 { "BCM2E34" },
1280 { "BCM2E35" },
1281 { "BCM2E36" },
1282 { "BCM2E37" },
1283 { "BCM2E38" },
1284 { "BCM2E39" },
1285 { "BCM2E3A" },
1286 { "BCM2E3B" },
1287 { "BCM2E3C" },
1288 { "BCM2E3D" },
1289 { "BCM2E3E" },
1290 { "BCM2E3F" },
1291 { "BCM2E40" },
1292 { "BCM2E41" },
1293 { "BCM2E42" },
1294 { "BCM2E43" },
1295 { "BCM2E44" },
1296 { "BCM2E45" },
1297 { "BCM2E46" },
1298 { "BCM2E47" },
1299 { "BCM2E48" },
1300 { "BCM2E49" },
1301 { "BCM2E4A" },
1302 { "BCM2E4B" },
1303 { "BCM2E4C" },
1304 { "BCM2E4D" },
1305 { "BCM2E4E" },
1306 { "BCM2E4F" },
1307 { "BCM2E50" },
1308 { "BCM2E51" },
1309 { "BCM2E52" },
1310 { "BCM2E53" },
1311 { "BCM2E54" },
1312 { "BCM2E55" },
1313 { "BCM2E56" },
1314 { "BCM2E57" },
1315 { "BCM2E58" },
1316 { "BCM2E59" },
1317 { "BCM2E5A" },
1318 { "BCM2E5B" },
1319 { "BCM2E5C" },
1320 { "BCM2E5D" },
1321 { "BCM2E5E" },
1322 { "BCM2E5F" },
1323 { "BCM2E60" },
1324 { "BCM2E61" },
1325 { "BCM2E62" },
1326 { "BCM2E63" },
1327 { "BCM2E64" },
1328 { "BCM2E65" },
1329 { "BCM2E66" },
1330 { "BCM2E67" },
1331 { "BCM2E68" },
1332 { "BCM2E69" },
1333 { "BCM2E6B" },
1334 { "BCM2E6D" },
1335 { "BCM2E6E" },
1336 { "BCM2E6F" },
1337 { "BCM2E70" },
1338 { "BCM2E71" },
1339 { "BCM2E72" },
1340 { "BCM2E73" },
1341 { "BCM2E74" },
1342 { "BCM2E75" },
1343 { "BCM2E76" },
1344 { "BCM2E77" },
1345 { "BCM2E78" },
1346 { "BCM2E79" },
1347 { "BCM2E7A" },
1348 { "BCM2E7B" },
1349 { "BCM2E7C" },
1350 { "BCM2E7D" },
1351 { "BCM2E7E" },
1352 { "BCM2E7F" },
1353 { "BCM2E80" },
1354 { "BCM2E81" },
1355 { "BCM2E82" },
1356 { "BCM2E83" },
1357 { "BCM2E84" },
1358 { "BCM2E85" },
1359 { "BCM2E86" },
1360 { "BCM2E87" },
1361 { "BCM2E88" },
1362 { "BCM2E89" },
1363 { "BCM2E8A" },
1364 { "BCM2E8B" },
1365 { "BCM2E8C" },
1366 { "BCM2E8D" },
1367 { "BCM2E8E" },
1368 { "BCM2E90" },
1369 { "BCM2E92" },
1370 { "BCM2E93" },
1371 { "BCM2E94" },
1372 { "BCM2E95" },
1373 { "BCM2E96" },
1374 { "BCM2E97" },
1375 { "BCM2E98" },
1376 { "BCM2E99" },
1377 { "BCM2E9A" },
1378 { "BCM2E9B" },
1379 { "BCM2E9C" },
1380 { "BCM2E9D" },
1381 { "BCM2EA0" },
1382 { "BCM2EA1" },
1383 { "BCM2EA2" },
1384 { "BCM2EA3" },
1385 { "BCM2EA4" },
1386 { "BCM2EA5" },
1387 { "BCM2EA6" },
1388 { "BCM2EA7" },
1389 { "BCM2EA8" },
1390 { "BCM2EA9" },
1391 { "BCM2EAA" },
1392 { "BCM2EAB" },
1393 { "BCM2EAC" },
1394 { },
1395};
1396MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
1397#endif
1398
1399/* suspend and resume callbacks */
1400static const struct dev_pm_ops bcm_pm_ops = {
1401 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
1402 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
1403};
1404
1405static struct platform_driver bcm_driver = {
1406 .probe = bcm_probe,
1407 .remove = bcm_remove,
1408 .driver = {
1409 .name = "hci_bcm",
1410 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1411 .pm = &bcm_pm_ops,
1412 },
1413};
1414
1415static int bcm_serdev_probe(struct serdev_device *serdev)
1416{
1417 struct bcm_device *bcmdev;
1418 const struct bcm_device_data *data;
1419 int err;
1420
1421 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
1422 if (!bcmdev)
1423 return -ENOMEM;
1424
1425 bcmdev->dev = &serdev->dev;
1426#ifdef CONFIG_PM
1427 bcmdev->hu = &bcmdev->serdev_hu;
1428#endif
1429 bcmdev->serdev_hu.serdev = serdev;
1430 serdev_device_set_drvdata(serdev, bcmdev);
1431
1432 /* Initialize routing field to an unused value */
1433 bcmdev->pcm_int_params[0] = 0xff;
1434
1435 if (has_acpi_companion(&serdev->dev))
1436 err = bcm_acpi_probe(bcmdev);
1437 else
1438 err = bcm_of_probe(bcmdev);
1439 if (err)
1440 return err;
1441
1442 err = bcm_get_resources(bcmdev);
1443 if (err)
1444 return err;
1445
1446 if (!bcmdev->shutdown) {
1447 dev_warn(&serdev->dev,
1448 "No reset resource, using default baud rate\n");
1449 bcmdev->oper_speed = bcmdev->init_speed;
1450 }
1451
1452 err = bcm_gpio_set_power(bcmdev, false);
1453 if (err)
1454 dev_err(&serdev->dev, "Failed to power down\n");
1455
1456 data = device_get_match_data(bcmdev->dev);
1457 if (data) {
1458 bcmdev->no_early_set_baudrate = data->no_early_set_baudrate;
1459 bcmdev->drive_rts_on_open = data->drive_rts_on_open;
1460 }
1461
1462 return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
1463}
1464
1465static void bcm_serdev_remove(struct serdev_device *serdev)
1466{
1467 struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
1468
1469 hci_uart_unregister_device(&bcmdev->serdev_hu);
1470}
1471
1472#ifdef CONFIG_OF
1473static struct bcm_device_data bcm4354_device_data = {
1474 .no_early_set_baudrate = true,
1475};
1476
1477static struct bcm_device_data bcm43438_device_data = {
1478 .drive_rts_on_open = true,
1479};
1480
1481static const struct of_device_id bcm_bluetooth_of_match[] = {
1482 { .compatible = "brcm,bcm20702a1" },
1483 { .compatible = "brcm,bcm4329-bt" },
1484 { .compatible = "brcm,bcm4345c5" },
1485 { .compatible = "brcm,bcm4330-bt" },
1486 { .compatible = "brcm,bcm43438-bt", .data = &bcm43438_device_data },
1487 { .compatible = "brcm,bcm43540-bt", .data = &bcm4354_device_data },
1488 { .compatible = "brcm,bcm4335a0" },
1489 { },
1490};
1491MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
1492#endif
1493
1494static struct serdev_device_driver bcm_serdev_driver = {
1495 .probe = bcm_serdev_probe,
1496 .remove = bcm_serdev_remove,
1497 .driver = {
1498 .name = "hci_uart_bcm",
1499 .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
1500 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1501 .pm = &bcm_pm_ops,
1502 },
1503};
1504
1505int __init bcm_init(void)
1506{
1507 /* For now, we need to keep both platform device
1508 * driver (ACPI generated) and serdev driver (DT).
1509 */
1510 platform_driver_register(&bcm_driver);
1511 serdev_device_driver_register(&bcm_serdev_driver);
1512
1513 return hci_uart_register_proto(&bcm_proto);
1514}
1515
1516int __exit bcm_deinit(void)
1517{
1518 platform_driver_unregister(&bcm_driver);
1519 serdev_device_driver_unregister(&bcm_serdev_driver);
1520
1521 return hci_uart_unregister_proto(&bcm_proto);
1522}
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
49struct 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
71struct 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 */
79static DEFINE_MUTEX(bcm_device_lock);
80static LIST_HEAD(bcm_device_list);
81
82static 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 */
132static 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
146static 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
163static 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
176static 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
204unlock:
205 mutex_unlock(&bcm_device_lock);
206
207 return err;
208}
209
210static 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
226static 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
248static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
249static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
250#endif
251
252static 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
275static 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
314static 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
347static 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
358static 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
412finalize:
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
433static 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
440static 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
468static 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
481static 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
508static 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
531static 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 */
556static 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
581unlock:
582 mutex_unlock(&bcm_device_lock);
583
584 return 0;
585}
586
587/* Platform resume callback */
588static 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
610unlock:
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
621static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
622static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
623static const struct acpi_gpio_params host_wakeup_gpios = { 2, 0, false };
624
625static 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
633static u8 acpi_active_low = ACPI_ACTIVE_LOW;
634
635/* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
636static 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
649static 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
682static 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
749static int bcm_acpi_probe(struct bcm_device *dev)
750{
751 return -EINVAL;
752}
753#endif /* CONFIG_ACPI */
754
755static 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
784static 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
799static 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
816static const struct acpi_device_id bcm_acpi_match[] = {
817 { "BCM2E1A", 0 },
818 { "BCM2E39", 0 },
819 { "BCM2E3A", 0 },
820 { "BCM2E3D", 0 },
821 { "BCM2E3F", 0 },
822 { "BCM2E40", 0 },
823 { "BCM2E54", 0 },
824 { "BCM2E55", 0 },
825 { "BCM2E64", 0 },
826 { "BCM2E65", 0 },
827 { "BCM2E67", 0 },
828 { "BCM2E7B", 0 },
829 { "BCM2E7C", 0 },
830 { },
831};
832MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
833#endif
834
835/* Platform suspend and resume callbacks */
836static const struct dev_pm_ops bcm_pm_ops = {
837 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
838 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
839};
840
841static struct platform_driver bcm_driver = {
842 .probe = bcm_probe,
843 .remove = bcm_remove,
844 .driver = {
845 .name = "hci_bcm",
846 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
847 .pm = &bcm_pm_ops,
848 },
849};
850
851int __init bcm_init(void)
852{
853 platform_driver_register(&bcm_driver);
854
855 return hci_uart_register_proto(&bcm_proto);
856}
857
858int __exit bcm_deinit(void)
859{
860 platform_driver_unregister(&bcm_driver);
861
862 return hci_uart_unregister_proto(&bcm_proto);
863}