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 */
55 struct 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 */
94 struct 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 */
133 struct 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 */
141 static DEFINE_MUTEX(bcm_device_lock);
142 static LIST_HEAD(bcm_device_list);
143
144 static int irq_polarity = -1;
145 module_param(irq_polarity, int, 0444);
146 MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");
147
host_set_baudrate(struct hci_uart * hu,unsigned int speed)148 static 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
bcm_set_baudrate(struct hci_uart * hu,unsigned int speed)156 static 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 */
bcm_device_exists(struct bcm_device * device)206 static 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
bcm_gpio_set_power(struct bcm_device * dev,bool powered)226 static 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
284 err_revert_shutdown:
285 dev->set_shutdown(dev, !powered);
286 err_txco_clk_disable:
287 if (powered && !dev->res_enabled)
288 clk_disable_unprepare(dev->txco_clk);
289 err_lpo_clk_disable:
290 if (powered && !dev->res_enabled)
291 clk_disable_unprepare(dev->lpo_clk);
292 err_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
bcm_host_wake(int irq,void * data)299 static 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
bcm_request_irq(struct bcm_data * bcm)312 static 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
347 unlock:
348 mutex_unlock(&bcm_device_lock);
349
350 return err;
351 }
352
353 static 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
bcm_setup_sleep(struct hci_uart * hu)369 static 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
bcm_request_irq(struct bcm_data * bcm)391 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
bcm_setup_sleep(struct hci_uart * hu)392 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
393 #endif
394
bcm_set_diag(struct hci_dev * hdev,bool enable)395 static 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
bcm_open(struct hci_uart * hu)418 static 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
463 out:
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
488 err_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
bcm_close(struct hci_uart * hu)499 static 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
bcm_flush(struct hci_uart * hu)542 static 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
bcm_setup(struct hci_uart * hu)553 static 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
653 static 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 { H4_RECV_ISO, .recv = hci_recv_frame },
658 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag },
659 { BCM_RECV_NULL, .recv = hci_recv_diag },
660 { BCM_RECV_TYPE49, .recv = hci_recv_diag },
661 { BCM_RECV_TYPE52, .recv = hci_recv_diag },
662 };
663
bcm_recv(struct hci_uart * hu,const void * data,int count)664 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
665 {
666 struct bcm_data *bcm = hu->priv;
667
668 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
669 return -EUNATCH;
670
671 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
672 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
673 if (IS_ERR(bcm->rx_skb)) {
674 int err = PTR_ERR(bcm->rx_skb);
675 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
676 bcm->rx_skb = NULL;
677 return err;
678 } else if (!bcm->rx_skb) {
679 /* Delay auto-suspend when receiving completed packet */
680 mutex_lock(&bcm_device_lock);
681 if (bcm->dev && bcm_device_exists(bcm->dev)) {
682 pm_runtime_get(bcm->dev->dev);
683 pm_runtime_mark_last_busy(bcm->dev->dev);
684 pm_runtime_put_autosuspend(bcm->dev->dev);
685 }
686 mutex_unlock(&bcm_device_lock);
687 }
688
689 return count;
690 }
691
bcm_enqueue(struct hci_uart * hu,struct sk_buff * skb)692 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
693 {
694 struct bcm_data *bcm = hu->priv;
695
696 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
697
698 /* Prepend skb with frame type */
699 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
700 skb_queue_tail(&bcm->txq, skb);
701
702 return 0;
703 }
704
bcm_dequeue(struct hci_uart * hu)705 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
706 {
707 struct bcm_data *bcm = hu->priv;
708 struct sk_buff *skb = NULL;
709 struct bcm_device *bdev = NULL;
710
711 mutex_lock(&bcm_device_lock);
712
713 if (bcm_device_exists(bcm->dev)) {
714 bdev = bcm->dev;
715 pm_runtime_get_sync(bdev->dev);
716 /* Shall be resumed here */
717 }
718
719 skb = skb_dequeue(&bcm->txq);
720
721 if (bdev) {
722 pm_runtime_mark_last_busy(bdev->dev);
723 pm_runtime_put_autosuspend(bdev->dev);
724 }
725
726 mutex_unlock(&bcm_device_lock);
727
728 return skb;
729 }
730
731 #ifdef CONFIG_PM
bcm_suspend_device(struct device * dev)732 static int bcm_suspend_device(struct device *dev)
733 {
734 struct bcm_device *bdev = dev_get_drvdata(dev);
735 int err;
736
737 bt_dev_dbg(bdev, "");
738
739 if (!bdev->is_suspended && bdev->hu) {
740 hci_uart_set_flow_control(bdev->hu, true);
741
742 /* Once this returns, driver suspends BT via GPIO */
743 bdev->is_suspended = true;
744 }
745
746 /* Suspend the device */
747 err = bdev->set_device_wakeup(bdev, false);
748 if (err) {
749 if (bdev->is_suspended && bdev->hu) {
750 bdev->is_suspended = false;
751 hci_uart_set_flow_control(bdev->hu, false);
752 }
753 return -EBUSY;
754 }
755
756 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
757 msleep(15);
758
759 return 0;
760 }
761
bcm_resume_device(struct device * dev)762 static int bcm_resume_device(struct device *dev)
763 {
764 struct bcm_device *bdev = dev_get_drvdata(dev);
765 int err;
766
767 bt_dev_dbg(bdev, "");
768
769 err = bdev->set_device_wakeup(bdev, true);
770 if (err) {
771 dev_err(dev, "Failed to power up\n");
772 return err;
773 }
774
775 bt_dev_dbg(bdev, "resume, delaying 15 ms");
776 msleep(15);
777
778 /* When this executes, the device has woken up already */
779 if (bdev->is_suspended && bdev->hu) {
780 bdev->is_suspended = false;
781
782 hci_uart_set_flow_control(bdev->hu, false);
783 }
784
785 return 0;
786 }
787 #endif
788
789 #ifdef CONFIG_PM_SLEEP
790 /* suspend callback */
bcm_suspend(struct device * dev)791 static int bcm_suspend(struct device *dev)
792 {
793 struct bcm_device *bdev = dev_get_drvdata(dev);
794 int error;
795
796 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
797
798 /*
799 * When used with a device instantiated as platform_device, bcm_suspend
800 * can be called at any time as long as the platform device is bound,
801 * so it should use bcm_device_lock to protect access to hci_uart
802 * and device_wake-up GPIO.
803 */
804 mutex_lock(&bcm_device_lock);
805
806 if (!bdev->hu)
807 goto unlock;
808
809 if (pm_runtime_active(dev))
810 bcm_suspend_device(dev);
811
812 if (device_may_wakeup(dev) && bdev->irq > 0) {
813 error = enable_irq_wake(bdev->irq);
814 if (!error)
815 bt_dev_dbg(bdev, "BCM irq: enabled");
816 }
817
818 unlock:
819 mutex_unlock(&bcm_device_lock);
820
821 return 0;
822 }
823
824 /* resume callback */
bcm_resume(struct device * dev)825 static int bcm_resume(struct device *dev)
826 {
827 struct bcm_device *bdev = dev_get_drvdata(dev);
828 int err = 0;
829
830 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
831
832 /*
833 * When used with a device instantiated as platform_device, bcm_resume
834 * can be called at any time as long as platform device is bound,
835 * so it should use bcm_device_lock to protect access to hci_uart
836 * and device_wake-up GPIO.
837 */
838 mutex_lock(&bcm_device_lock);
839
840 if (!bdev->hu)
841 goto unlock;
842
843 if (device_may_wakeup(dev) && bdev->irq > 0) {
844 disable_irq_wake(bdev->irq);
845 bt_dev_dbg(bdev, "BCM irq: disabled");
846 }
847
848 err = bcm_resume_device(dev);
849
850 unlock:
851 mutex_unlock(&bcm_device_lock);
852
853 if (!err) {
854 pm_runtime_disable(dev);
855 pm_runtime_set_active(dev);
856 pm_runtime_enable(dev);
857 }
858
859 return 0;
860 }
861 #endif
862
863 /* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
864 static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
865 {
866 .ident = "Meegopad T08",
867 .matches = {
868 DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
869 "To be filled by OEM."),
870 DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
871 DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
872 },
873 },
874 { }
875 };
876
877 #ifdef CONFIG_ACPI
878 static const struct acpi_gpio_params first_gpio = { 0, 0, false };
879 static const struct acpi_gpio_params second_gpio = { 1, 0, false };
880 static const struct acpi_gpio_params third_gpio = { 2, 0, false };
881
882 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
883 { "device-wakeup-gpios", &first_gpio, 1 },
884 { "shutdown-gpios", &second_gpio, 1 },
885 { "host-wakeup-gpios", &third_gpio, 1 },
886 { },
887 };
888
889 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
890 { "host-wakeup-gpios", &first_gpio, 1 },
891 { "device-wakeup-gpios", &second_gpio, 1 },
892 { "shutdown-gpios", &third_gpio, 1 },
893 { },
894 };
895
bcm_resource(struct acpi_resource * ares,void * data)896 static int bcm_resource(struct acpi_resource *ares, void *data)
897 {
898 struct bcm_device *dev = data;
899 struct acpi_resource_extended_irq *irq;
900 struct acpi_resource_gpio *gpio;
901 struct acpi_resource_uart_serialbus *sb;
902
903 switch (ares->type) {
904 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
905 irq = &ares->data.extended_irq;
906 if (irq->polarity != ACPI_ACTIVE_LOW)
907 dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
908 dev->irq_active_low = true;
909 break;
910
911 case ACPI_RESOURCE_TYPE_GPIO:
912 gpio = &ares->data.gpio;
913 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
914 dev->gpio_int_idx = dev->gpio_count;
915 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
916 }
917 dev->gpio_count++;
918 break;
919
920 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
921 sb = &ares->data.uart_serial_bus;
922 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
923 dev->init_speed = sb->default_baud_rate;
924 dev->oper_speed = 4000000;
925 }
926 break;
927
928 default:
929 break;
930 }
931
932 return 0;
933 }
934
bcm_apple_set_device_wakeup(struct bcm_device * dev,bool awake)935 static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
936 {
937 if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
938 return -EIO;
939
940 return 0;
941 }
942
bcm_apple_set_shutdown(struct bcm_device * dev,bool powered)943 static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
944 {
945 if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
946 NULL, NULL, NULL)))
947 return -EIO;
948
949 return 0;
950 }
951
bcm_apple_get_resources(struct bcm_device * dev)952 static int bcm_apple_get_resources(struct bcm_device *dev)
953 {
954 struct acpi_device *adev = ACPI_COMPANION(dev->dev);
955 const union acpi_object *obj;
956
957 if (!adev ||
958 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
959 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
960 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
961 return -ENODEV;
962
963 if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
964 obj->buffer.length == 8)
965 dev->init_speed = *(u64 *)obj->buffer.pointer;
966
967 dev->set_device_wakeup = bcm_apple_set_device_wakeup;
968 dev->set_shutdown = bcm_apple_set_shutdown;
969
970 return 0;
971 }
972 #else
bcm_apple_get_resources(struct bcm_device * dev)973 static inline int bcm_apple_get_resources(struct bcm_device *dev)
974 {
975 return -EOPNOTSUPP;
976 }
977 #endif /* CONFIG_ACPI */
978
bcm_gpio_set_device_wakeup(struct bcm_device * dev,bool awake)979 static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
980 {
981 gpiod_set_value_cansleep(dev->device_wakeup, awake);
982 return 0;
983 }
984
bcm_gpio_set_shutdown(struct bcm_device * dev,bool powered)985 static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
986 {
987 gpiod_set_value_cansleep(dev->shutdown, powered);
988 return 0;
989 }
990
991 /* Try a bunch of names for TXCO */
bcm_get_txco(struct device * dev)992 static struct clk *bcm_get_txco(struct device *dev)
993 {
994 struct clk *clk;
995
996 /* New explicit name */
997 clk = devm_clk_get(dev, "txco");
998 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
999 return clk;
1000
1001 /* Deprecated name */
1002 clk = devm_clk_get(dev, "extclk");
1003 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
1004 return clk;
1005
1006 /* Original code used no name at all */
1007 return devm_clk_get(dev, NULL);
1008 }
1009
bcm_get_resources(struct bcm_device * dev)1010 static int bcm_get_resources(struct bcm_device *dev)
1011 {
1012 const struct dmi_system_id *dmi_id;
1013 int err;
1014
1015 dev->name = dev_name(dev->dev);
1016
1017 if (x86_apple_machine && !bcm_apple_get_resources(dev))
1018 return 0;
1019
1020 dev->txco_clk = bcm_get_txco(dev->dev);
1021
1022 /* Handle deferred probing */
1023 if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER))
1024 return PTR_ERR(dev->txco_clk);
1025
1026 /* Ignore all other errors as before */
1027 if (IS_ERR(dev->txco_clk))
1028 dev->txco_clk = NULL;
1029
1030 dev->lpo_clk = devm_clk_get(dev->dev, "lpo");
1031 if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER))
1032 return PTR_ERR(dev->lpo_clk);
1033
1034 if (IS_ERR(dev->lpo_clk))
1035 dev->lpo_clk = NULL;
1036
1037 /* Check if we accidentally fetched the lpo clock twice */
1038 if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) {
1039 devm_clk_put(dev->dev, dev->txco_clk);
1040 dev->txco_clk = NULL;
1041 }
1042
1043 dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
1044 GPIOD_OUT_LOW);
1045 if (IS_ERR(dev->device_wakeup))
1046 return PTR_ERR(dev->device_wakeup);
1047
1048 dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
1049 GPIOD_OUT_LOW);
1050 if (IS_ERR(dev->shutdown))
1051 return PTR_ERR(dev->shutdown);
1052
1053 dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
1054 dev->set_shutdown = bcm_gpio_set_shutdown;
1055
1056 dev->supplies[0].supply = "vbat";
1057 dev->supplies[1].supply = "vddio";
1058 err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
1059 dev->supplies);
1060 if (err)
1061 return err;
1062
1063 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
1064 if (dev->irq <= 0) {
1065 struct gpio_desc *gpio;
1066
1067 gpio = devm_gpiod_get_optional(dev->dev, "host-wakeup",
1068 GPIOD_IN);
1069 if (IS_ERR(gpio))
1070 return PTR_ERR(gpio);
1071
1072 dev->irq = gpiod_to_irq(gpio);
1073 }
1074
1075 dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
1076 if (dmi_id) {
1077 dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
1078 dmi_id->ident);
1079 dev->irq = 0;
1080 }
1081
1082 dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
1083 return 0;
1084 }
1085
1086 #ifdef CONFIG_ACPI
bcm_acpi_probe(struct bcm_device * dev)1087 static int bcm_acpi_probe(struct bcm_device *dev)
1088 {
1089 LIST_HEAD(resources);
1090 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
1091 struct resource_entry *entry;
1092 int ret;
1093
1094 /* Retrieve UART ACPI info */
1095 dev->gpio_int_idx = -1;
1096 ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
1097 &resources, bcm_resource, dev);
1098 if (ret < 0)
1099 return ret;
1100
1101 resource_list_for_each_entry(entry, &resources) {
1102 if (resource_type(entry->res) == IORESOURCE_IRQ) {
1103 dev->irq = entry->res->start;
1104 break;
1105 }
1106 }
1107 acpi_dev_free_resource_list(&resources);
1108
1109 /* If the DSDT uses an Interrupt resource for the IRQ, then there are
1110 * only 2 GPIO resources, we use the irq-last mapping for this, since
1111 * we already have an irq the 3th / last mapping will not be used.
1112 */
1113 if (dev->irq)
1114 gpio_mapping = acpi_bcm_int_last_gpios;
1115 else if (dev->gpio_int_idx == 0)
1116 gpio_mapping = acpi_bcm_int_first_gpios;
1117 else if (dev->gpio_int_idx == 2)
1118 gpio_mapping = acpi_bcm_int_last_gpios;
1119 else
1120 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
1121 dev->gpio_int_idx);
1122
1123 /* Warn if our expectations are not met. */
1124 if (dev->gpio_count != (dev->irq ? 2 : 3))
1125 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
1126 dev->gpio_count);
1127
1128 ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
1129 if (ret)
1130 return ret;
1131
1132 if (irq_polarity != -1) {
1133 dev->irq_active_low = irq_polarity;
1134 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
1135 dev->irq_active_low ? "low" : "high");
1136 }
1137
1138 return 0;
1139 }
1140 #else
bcm_acpi_probe(struct bcm_device * dev)1141 static int bcm_acpi_probe(struct bcm_device *dev)
1142 {
1143 return -EINVAL;
1144 }
1145 #endif /* CONFIG_ACPI */
1146
bcm_of_probe(struct bcm_device * bdev)1147 static int bcm_of_probe(struct bcm_device *bdev)
1148 {
1149 device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
1150 device_property_read_u8_array(bdev->dev, "brcm,bt-pcm-int-params",
1151 bdev->pcm_int_params, 5);
1152 bdev->irq = of_irq_get_byname(bdev->dev->of_node, "host-wakeup");
1153 bdev->irq_active_low = irq_get_trigger_type(bdev->irq)
1154 & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW);
1155 return 0;
1156 }
1157
bcm_probe(struct platform_device * pdev)1158 static int bcm_probe(struct platform_device *pdev)
1159 {
1160 struct bcm_device *dev;
1161 int ret;
1162
1163 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1164 if (!dev)
1165 return -ENOMEM;
1166
1167 dev->dev = &pdev->dev;
1168
1169 ret = platform_get_irq(pdev, 0);
1170 if (ret < 0)
1171 return ret;
1172
1173 dev->irq = ret;
1174
1175 /* Initialize routing field to an unused value */
1176 dev->pcm_int_params[0] = 0xff;
1177
1178 if (has_acpi_companion(&pdev->dev)) {
1179 ret = bcm_acpi_probe(dev);
1180 if (ret)
1181 return ret;
1182 }
1183
1184 ret = bcm_get_resources(dev);
1185 if (ret)
1186 return ret;
1187
1188 platform_set_drvdata(pdev, dev);
1189
1190 dev_info(&pdev->dev, "%s device registered.\n", dev->name);
1191
1192 /* Place this instance on the device list */
1193 mutex_lock(&bcm_device_lock);
1194 list_add_tail(&dev->list, &bcm_device_list);
1195 mutex_unlock(&bcm_device_lock);
1196
1197 ret = bcm_gpio_set_power(dev, false);
1198 if (ret)
1199 dev_err(&pdev->dev, "Failed to power down\n");
1200
1201 return 0;
1202 }
1203
bcm_remove(struct platform_device * pdev)1204 static int bcm_remove(struct platform_device *pdev)
1205 {
1206 struct bcm_device *dev = platform_get_drvdata(pdev);
1207
1208 mutex_lock(&bcm_device_lock);
1209 list_del(&dev->list);
1210 mutex_unlock(&bcm_device_lock);
1211
1212 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
1213
1214 return 0;
1215 }
1216
1217 static const struct hci_uart_proto bcm_proto = {
1218 .id = HCI_UART_BCM,
1219 .name = "Broadcom",
1220 .manufacturer = 15,
1221 .init_speed = 115200,
1222 .open = bcm_open,
1223 .close = bcm_close,
1224 .flush = bcm_flush,
1225 .setup = bcm_setup,
1226 .set_baudrate = bcm_set_baudrate,
1227 .recv = bcm_recv,
1228 .enqueue = bcm_enqueue,
1229 .dequeue = bcm_dequeue,
1230 };
1231
1232 #ifdef CONFIG_ACPI
1233 static const struct acpi_device_id bcm_acpi_match[] = {
1234 { "BCM2E00" },
1235 { "BCM2E01" },
1236 { "BCM2E02" },
1237 { "BCM2E03" },
1238 { "BCM2E04" },
1239 { "BCM2E05" },
1240 { "BCM2E06" },
1241 { "BCM2E07" },
1242 { "BCM2E08" },
1243 { "BCM2E09" },
1244 { "BCM2E0A" },
1245 { "BCM2E0B" },
1246 { "BCM2E0C" },
1247 { "BCM2E0D" },
1248 { "BCM2E0E" },
1249 { "BCM2E0F" },
1250 { "BCM2E10" },
1251 { "BCM2E11" },
1252 { "BCM2E12" },
1253 { "BCM2E13" },
1254 { "BCM2E14" },
1255 { "BCM2E15" },
1256 { "BCM2E16" },
1257 { "BCM2E17" },
1258 { "BCM2E18" },
1259 { "BCM2E19" },
1260 { "BCM2E1A" },
1261 { "BCM2E1B" },
1262 { "BCM2E1C" },
1263 { "BCM2E1D" },
1264 { "BCM2E1F" },
1265 { "BCM2E20" },
1266 { "BCM2E21" },
1267 { "BCM2E22" },
1268 { "BCM2E23" },
1269 { "BCM2E24" },
1270 { "BCM2E25" },
1271 { "BCM2E26" },
1272 { "BCM2E27" },
1273 { "BCM2E28" },
1274 { "BCM2E29" },
1275 { "BCM2E2A" },
1276 { "BCM2E2B" },
1277 { "BCM2E2C" },
1278 { "BCM2E2D" },
1279 { "BCM2E2E" },
1280 { "BCM2E2F" },
1281 { "BCM2E30" },
1282 { "BCM2E31" },
1283 { "BCM2E32" },
1284 { "BCM2E33" },
1285 { "BCM2E34" },
1286 { "BCM2E35" },
1287 { "BCM2E36" },
1288 { "BCM2E37" },
1289 { "BCM2E38" },
1290 { "BCM2E39" },
1291 { "BCM2E3A" },
1292 { "BCM2E3B" },
1293 { "BCM2E3C" },
1294 { "BCM2E3D" },
1295 { "BCM2E3E" },
1296 { "BCM2E3F" },
1297 { "BCM2E40" },
1298 { "BCM2E41" },
1299 { "BCM2E42" },
1300 { "BCM2E43" },
1301 { "BCM2E44" },
1302 { "BCM2E45" },
1303 { "BCM2E46" },
1304 { "BCM2E47" },
1305 { "BCM2E48" },
1306 { "BCM2E49" },
1307 { "BCM2E4A" },
1308 { "BCM2E4B" },
1309 { "BCM2E4C" },
1310 { "BCM2E4D" },
1311 { "BCM2E4E" },
1312 { "BCM2E4F" },
1313 { "BCM2E50" },
1314 { "BCM2E51" },
1315 { "BCM2E52" },
1316 { "BCM2E53" },
1317 { "BCM2E54" },
1318 { "BCM2E55" },
1319 { "BCM2E56" },
1320 { "BCM2E57" },
1321 { "BCM2E58" },
1322 { "BCM2E59" },
1323 { "BCM2E5A" },
1324 { "BCM2E5B" },
1325 { "BCM2E5C" },
1326 { "BCM2E5D" },
1327 { "BCM2E5E" },
1328 { "BCM2E5F" },
1329 { "BCM2E60" },
1330 { "BCM2E61" },
1331 { "BCM2E62" },
1332 { "BCM2E63" },
1333 { "BCM2E64" },
1334 { "BCM2E65" },
1335 { "BCM2E66" },
1336 { "BCM2E67" },
1337 { "BCM2E68" },
1338 { "BCM2E69" },
1339 { "BCM2E6B" },
1340 { "BCM2E6D" },
1341 { "BCM2E6E" },
1342 { "BCM2E6F" },
1343 { "BCM2E70" },
1344 { "BCM2E71" },
1345 { "BCM2E72" },
1346 { "BCM2E73" },
1347 { "BCM2E74" },
1348 { "BCM2E75" },
1349 { "BCM2E76" },
1350 { "BCM2E77" },
1351 { "BCM2E78" },
1352 { "BCM2E79" },
1353 { "BCM2E7A" },
1354 { "BCM2E7B" },
1355 { "BCM2E7C" },
1356 { "BCM2E7D" },
1357 { "BCM2E7E" },
1358 { "BCM2E7F" },
1359 { "BCM2E80" },
1360 { "BCM2E81" },
1361 { "BCM2E82" },
1362 { "BCM2E83" },
1363 { "BCM2E84" },
1364 { "BCM2E85" },
1365 { "BCM2E86" },
1366 { "BCM2E87" },
1367 { "BCM2E88" },
1368 { "BCM2E89" },
1369 { "BCM2E8A" },
1370 { "BCM2E8B" },
1371 { "BCM2E8C" },
1372 { "BCM2E8D" },
1373 { "BCM2E8E" },
1374 { "BCM2E90" },
1375 { "BCM2E92" },
1376 { "BCM2E93" },
1377 { "BCM2E94" },
1378 { "BCM2E95" },
1379 { "BCM2E96" },
1380 { "BCM2E97" },
1381 { "BCM2E98" },
1382 { "BCM2E99" },
1383 { "BCM2E9A" },
1384 { "BCM2E9B" },
1385 { "BCM2E9C" },
1386 { "BCM2E9D" },
1387 { "BCM2EA0" },
1388 { "BCM2EA1" },
1389 { "BCM2EA2" },
1390 { "BCM2EA3" },
1391 { "BCM2EA4" },
1392 { "BCM2EA5" },
1393 { "BCM2EA6" },
1394 { "BCM2EA7" },
1395 { "BCM2EA8" },
1396 { "BCM2EA9" },
1397 { "BCM2EAA" },
1398 { "BCM2EAB" },
1399 { "BCM2EAC" },
1400 { },
1401 };
1402 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
1403 #endif
1404
1405 /* suspend and resume callbacks */
1406 static const struct dev_pm_ops bcm_pm_ops = {
1407 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
1408 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
1409 };
1410
1411 static struct platform_driver bcm_driver = {
1412 .probe = bcm_probe,
1413 .remove = bcm_remove,
1414 .driver = {
1415 .name = "hci_bcm",
1416 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1417 .pm = &bcm_pm_ops,
1418 },
1419 };
1420
bcm_serdev_probe(struct serdev_device * serdev)1421 static int bcm_serdev_probe(struct serdev_device *serdev)
1422 {
1423 struct bcm_device *bcmdev;
1424 const struct bcm_device_data *data;
1425 int err;
1426
1427 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
1428 if (!bcmdev)
1429 return -ENOMEM;
1430
1431 bcmdev->dev = &serdev->dev;
1432 #ifdef CONFIG_PM
1433 bcmdev->hu = &bcmdev->serdev_hu;
1434 #endif
1435 bcmdev->serdev_hu.serdev = serdev;
1436 serdev_device_set_drvdata(serdev, bcmdev);
1437
1438 /* Initialize routing field to an unused value */
1439 bcmdev->pcm_int_params[0] = 0xff;
1440
1441 if (has_acpi_companion(&serdev->dev))
1442 err = bcm_acpi_probe(bcmdev);
1443 else
1444 err = bcm_of_probe(bcmdev);
1445 if (err)
1446 return err;
1447
1448 err = bcm_get_resources(bcmdev);
1449 if (err)
1450 return err;
1451
1452 if (!bcmdev->shutdown) {
1453 dev_warn(&serdev->dev,
1454 "No reset resource, using default baud rate\n");
1455 bcmdev->oper_speed = bcmdev->init_speed;
1456 }
1457
1458 err = bcm_gpio_set_power(bcmdev, false);
1459 if (err)
1460 dev_err(&serdev->dev, "Failed to power down\n");
1461
1462 data = device_get_match_data(bcmdev->dev);
1463 if (data) {
1464 bcmdev->no_early_set_baudrate = data->no_early_set_baudrate;
1465 bcmdev->drive_rts_on_open = data->drive_rts_on_open;
1466 }
1467
1468 return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
1469 }
1470
bcm_serdev_remove(struct serdev_device * serdev)1471 static void bcm_serdev_remove(struct serdev_device *serdev)
1472 {
1473 struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
1474
1475 hci_uart_unregister_device(&bcmdev->serdev_hu);
1476 }
1477
1478 #ifdef CONFIG_OF
1479 static struct bcm_device_data bcm4354_device_data = {
1480 .no_early_set_baudrate = true,
1481 };
1482
1483 static struct bcm_device_data bcm43438_device_data = {
1484 .drive_rts_on_open = true,
1485 };
1486
1487 static const struct of_device_id bcm_bluetooth_of_match[] = {
1488 { .compatible = "brcm,bcm20702a1" },
1489 { .compatible = "brcm,bcm4329-bt" },
1490 { .compatible = "brcm,bcm4345c5" },
1491 { .compatible = "brcm,bcm4330-bt" },
1492 { .compatible = "brcm,bcm43438-bt", .data = &bcm43438_device_data },
1493 { .compatible = "brcm,bcm4349-bt", .data = &bcm43438_device_data },
1494 { .compatible = "brcm,bcm43540-bt", .data = &bcm4354_device_data },
1495 { .compatible = "brcm,bcm4335a0" },
1496 { .compatible = "infineon,cyw55572-bt" },
1497 { },
1498 };
1499 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
1500 #endif
1501
1502 static struct serdev_device_driver bcm_serdev_driver = {
1503 .probe = bcm_serdev_probe,
1504 .remove = bcm_serdev_remove,
1505 .driver = {
1506 .name = "hci_uart_bcm",
1507 .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
1508 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1509 .pm = &bcm_pm_ops,
1510 },
1511 };
1512
bcm_init(void)1513 int __init bcm_init(void)
1514 {
1515 /* For now, we need to keep both platform device
1516 * driver (ACPI generated) and serdev driver (DT).
1517 */
1518 platform_driver_register(&bcm_driver);
1519 serdev_device_driver_register(&bcm_serdev_driver);
1520
1521 return hci_uart_register_proto(&bcm_proto);
1522 }
1523
bcm_deinit(void)1524 int __exit bcm_deinit(void)
1525 {
1526 platform_driver_unregister(&bcm_driver);
1527 serdev_device_driver_unregister(&bcm_serdev_driver);
1528
1529 return hci_uart_unregister_proto(&bcm_proto);
1530 }
1531