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/gpio/machine.h>
24 #include <linux/tty.h>
25 #include <linux/interrupt.h>
26 #include <linux/dmi.h>
27 #include <linux/pm_runtime.h>
28 #include <linux/serdev.h>
29 
30 #include <net/bluetooth/bluetooth.h>
31 #include <net/bluetooth/hci_core.h>
32 
33 #include "btbcm.h"
34 #include "hci_uart.h"
35 
36 #define BCM_NULL_PKT 0x00
37 #define BCM_NULL_SIZE 0
38 
39 #define BCM_LM_DIAG_PKT 0x07
40 #define BCM_LM_DIAG_SIZE 63
41 
42 #define BCM_TYPE49_PKT 0x31
43 #define BCM_TYPE49_SIZE 0
44 
45 #define BCM_TYPE52_PKT 0x34
46 #define BCM_TYPE52_SIZE 0
47 
48 #define BCM_AUTOSUSPEND_DELAY	5000 /* default autosleep delay */
49 
50 #define BCM_NUM_SUPPLIES 2
51 
52 /**
53  * struct bcm_device_data - device specific data
54  * @no_early_set_baudrate: Disallow set baudrate before driver setup()
55  * @drive_rts_on_open: drive RTS signal on ->open() when platform requires it
56  * @no_uart_clock_set: UART clock set command for >3Mbps mode is unavailable
57  * @max_autobaud_speed: max baudrate supported by device in autobaud mode
58  */
59 struct bcm_device_data {
60 	bool	no_early_set_baudrate;
61 	bool	drive_rts_on_open;
62 	bool	no_uart_clock_set;
63 	u32	max_autobaud_speed;
64 };
65 
66 /**
67  * struct bcm_device - device driver resources
68  * @serdev_hu: HCI UART controller struct
69  * @list: bcm_device_list node
70  * @dev: physical UART slave
71  * @name: device name logged by bt_dev_*() functions
72  * @device_wakeup: BT_WAKE pin,
73  *	assert = Bluetooth device must wake up or remain awake,
74  *	deassert = Bluetooth device may sleep when sleep criteria are met
75  * @shutdown: BT_REG_ON pin,
76  *	power up or power down Bluetooth device internal regulators
77  * @reset: BT_RST_N pin,
78  *	active low resets the Bluetooth logic core
79  * @set_device_wakeup: callback to toggle BT_WAKE pin
80  *	either by accessing @device_wakeup or by calling @btlp
81  * @set_shutdown: callback to toggle BT_REG_ON pin
82  *	either by accessing @shutdown or by calling @btpu/@btpd
83  * @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power")
84  * @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up")
85  * @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down")
86  * @gpio_count: internal counter for GPIO resources associated with ACPI device
87  * @gpio_int_idx: index in _CRS for GpioInt() resource
88  * @txco_clk: external reference frequency clock used by Bluetooth device
89  * @lpo_clk: external LPO clock used by Bluetooth device
90  * @supplies: VBAT and VDDIO supplies used by Bluetooth device
91  * @res_enabled: whether clocks and supplies are prepared and enabled
92  * @init_speed: default baudrate of Bluetooth device;
93  *	the host UART is initially set to this baudrate so that
94  *	it can configure the Bluetooth device for @oper_speed
95  * @oper_speed: preferred baudrate of Bluetooth device;
96  *	set to 0 if @init_speed is already the preferred baudrate
97  * @irq: interrupt triggered by HOST_WAKE_BT pin
98  * @irq_active_low: whether @irq is active low
99  * @irq_acquired: flag to show if IRQ handler has been assigned
100  * @hu: pointer to HCI UART controller struct,
101  *	used to disable flow control during runtime suspend and system sleep
102  * @is_suspended: whether flow control is currently disabled
103  * @no_early_set_baudrate: don't set_baudrate before setup()
104  * @drive_rts_on_open: drive RTS signal on ->open() when platform requires it
105  * @no_uart_clock_set: UART clock set command for >3Mbps mode is unavailable
106  * @pcm_int_params: keep the initial PCM configuration
107  * @use_autobaud_mode: start Bluetooth device in autobaud mode
108  * @max_autobaud_speed: max baudrate supported by device in autobaud mode
109  */
110 struct bcm_device {
111 	/* Must be the first member, hci_serdev.c expects this. */
112 	struct hci_uart		serdev_hu;
113 	struct list_head	list;
114 
115 	struct device		*dev;
116 
117 	const char		*name;
118 	struct gpio_desc	*device_wakeup;
119 	struct gpio_desc	*shutdown;
120 	struct gpio_desc	*reset;
121 	int			(*set_device_wakeup)(struct bcm_device *, bool);
122 	int			(*set_shutdown)(struct bcm_device *, bool);
123 #ifdef CONFIG_ACPI
124 	acpi_handle		btlp, btpu, btpd;
125 	int			gpio_count;
126 	int			gpio_int_idx;
127 #endif
128 
129 	struct clk		*txco_clk;
130 	struct clk		*lpo_clk;
131 	struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES];
132 	bool			res_enabled;
133 
134 	u32			init_speed;
135 	u32			oper_speed;
136 	int			irq;
137 	bool			irq_active_low;
138 	bool			irq_acquired;
139 
140 #ifdef CONFIG_PM
141 	struct hci_uart		*hu;
142 	bool			is_suspended;
143 #endif
144 	bool			no_early_set_baudrate;
145 	bool			drive_rts_on_open;
146 	bool			no_uart_clock_set;
147 	bool			use_autobaud_mode;
148 	u8			pcm_int_params[5];
149 	u32			max_autobaud_speed;
150 };
151 
152 /* generic bcm uart resources */
153 struct bcm_data {
154 	struct sk_buff		*rx_skb;
155 	struct sk_buff_head	txq;
156 
157 	struct bcm_device	*dev;
158 };
159 
160 /* List of BCM BT UART devices */
161 static DEFINE_MUTEX(bcm_device_lock);
162 static LIST_HEAD(bcm_device_list);
163 
164 static int irq_polarity = -1;
165 module_param(irq_polarity, int, 0444);
166 MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");
167 
host_set_baudrate(struct hci_uart * hu,unsigned int speed)168 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
169 {
170 	if (hu->serdev)
171 		serdev_device_set_baudrate(hu->serdev, speed);
172 	else
173 		hci_uart_set_baudrate(hu, speed);
174 }
175 
bcm_set_baudrate(struct hci_uart * hu,unsigned int speed)176 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
177 {
178 	struct hci_dev *hdev = hu->hdev;
179 	struct bcm_data *bcm = hu->priv;
180 	struct sk_buff *skb;
181 	struct bcm_update_uart_baud_rate param;
182 
183 	if (speed > 3000000 && !bcm->dev->no_uart_clock_set) {
184 		struct bcm_write_uart_clock_setting clock;
185 
186 		clock.type = BCM_UART_CLOCK_48MHZ;
187 
188 		bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
189 
190 		/* This Broadcom specific command changes the UART's controller
191 		 * clock for baud rate > 3000000.
192 		 */
193 		skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
194 		if (IS_ERR(skb)) {
195 			int err = PTR_ERR(skb);
196 			bt_dev_err(hdev, "BCM: failed to write clock (%d)",
197 				   err);
198 			return err;
199 		}
200 
201 		kfree_skb(skb);
202 	}
203 
204 	bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
205 
206 	param.zero = cpu_to_le16(0);
207 	param.baud_rate = cpu_to_le32(speed);
208 
209 	/* This Broadcom specific command changes the UART's controller baud
210 	 * rate.
211 	 */
212 	skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
213 			     HCI_INIT_TIMEOUT);
214 	if (IS_ERR(skb)) {
215 		int err = PTR_ERR(skb);
216 		bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
217 			   err);
218 		return err;
219 	}
220 
221 	kfree_skb(skb);
222 
223 	return 0;
224 }
225 
226 /* bcm_device_exists should be protected by bcm_device_lock */
bcm_device_exists(struct bcm_device * device)227 static bool bcm_device_exists(struct bcm_device *device)
228 {
229 	struct list_head *p;
230 
231 #ifdef CONFIG_PM
232 	/* Devices using serdev always exist */
233 	if (device && device->hu && device->hu->serdev)
234 		return true;
235 #endif
236 
237 	list_for_each(p, &bcm_device_list) {
238 		struct bcm_device *dev = list_entry(p, struct bcm_device, list);
239 
240 		if (device == dev)
241 			return true;
242 	}
243 
244 	return false;
245 }
246 
bcm_gpio_set_power(struct bcm_device * dev,bool powered)247 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
248 {
249 	int err;
250 
251 	if (powered && !dev->res_enabled) {
252 		/* Intel Macs use bcm_apple_get_resources() and don't
253 		 * have regulator supplies configured.
254 		 */
255 		if (dev->supplies[0].supply) {
256 			err = regulator_bulk_enable(BCM_NUM_SUPPLIES,
257 						    dev->supplies);
258 			if (err)
259 				return err;
260 		}
261 
262 		/* LPO clock needs to be 32.768 kHz */
263 		err = clk_set_rate(dev->lpo_clk, 32768);
264 		if (err) {
265 			dev_err(dev->dev, "Could not set LPO clock rate\n");
266 			goto err_regulator_disable;
267 		}
268 
269 		err = clk_prepare_enable(dev->lpo_clk);
270 		if (err)
271 			goto err_regulator_disable;
272 
273 		err = clk_prepare_enable(dev->txco_clk);
274 		if (err)
275 			goto err_lpo_clk_disable;
276 	}
277 
278 	err = dev->set_shutdown(dev, powered);
279 	if (err)
280 		goto err_txco_clk_disable;
281 
282 	err = dev->set_device_wakeup(dev, powered);
283 	if (err)
284 		goto err_revert_shutdown;
285 
286 	if (!powered && dev->res_enabled) {
287 		clk_disable_unprepare(dev->txco_clk);
288 		clk_disable_unprepare(dev->lpo_clk);
289 
290 		/* Intel Macs use bcm_apple_get_resources() and don't
291 		 * have regulator supplies configured.
292 		 */
293 		if (dev->supplies[0].supply)
294 			regulator_bulk_disable(BCM_NUM_SUPPLIES,
295 					       dev->supplies);
296 	}
297 
298 	/* wait for device to power on and come out of reset */
299 	usleep_range(100000, 120000);
300 
301 	dev->res_enabled = powered;
302 
303 	return 0;
304 
305 err_revert_shutdown:
306 	dev->set_shutdown(dev, !powered);
307 err_txco_clk_disable:
308 	if (powered && !dev->res_enabled)
309 		clk_disable_unprepare(dev->txco_clk);
310 err_lpo_clk_disable:
311 	if (powered && !dev->res_enabled)
312 		clk_disable_unprepare(dev->lpo_clk);
313 err_regulator_disable:
314 	if (powered && !dev->res_enabled)
315 		regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies);
316 	return err;
317 }
318 
319 #ifdef CONFIG_PM
bcm_host_wake(int irq,void * data)320 static irqreturn_t bcm_host_wake(int irq, void *data)
321 {
322 	struct bcm_device *bdev = data;
323 
324 	bt_dev_dbg(bdev, "Host wake IRQ");
325 
326 	pm_runtime_get(bdev->dev);
327 	pm_runtime_mark_last_busy(bdev->dev);
328 	pm_runtime_put_autosuspend(bdev->dev);
329 
330 	return IRQ_HANDLED;
331 }
332 
bcm_request_irq(struct bcm_data * bcm)333 static int bcm_request_irq(struct bcm_data *bcm)
334 {
335 	struct bcm_device *bdev = bcm->dev;
336 	int err;
337 
338 	mutex_lock(&bcm_device_lock);
339 	if (!bcm_device_exists(bdev)) {
340 		err = -ENODEV;
341 		goto unlock;
342 	}
343 
344 	if (bdev->irq <= 0) {
345 		err = -EOPNOTSUPP;
346 		goto unlock;
347 	}
348 
349 	err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake,
350 			       bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
351 						      IRQF_TRIGGER_RISING,
352 			       "host_wake", bdev);
353 	if (err) {
354 		bdev->irq = err;
355 		goto unlock;
356 	}
357 
358 	bdev->irq_acquired = true;
359 
360 	device_init_wakeup(bdev->dev, true);
361 
362 	pm_runtime_set_autosuspend_delay(bdev->dev,
363 					 BCM_AUTOSUSPEND_DELAY);
364 	pm_runtime_use_autosuspend(bdev->dev);
365 	pm_runtime_set_active(bdev->dev);
366 	pm_runtime_enable(bdev->dev);
367 
368 unlock:
369 	mutex_unlock(&bcm_device_lock);
370 
371 	return err;
372 }
373 
374 static const struct bcm_set_sleep_mode default_sleep_params = {
375 	.sleep_mode = 1,	/* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
376 	.idle_host = 2,		/* idle threshold HOST, in 300ms */
377 	.idle_dev = 2,		/* idle threshold device, in 300ms */
378 	.bt_wake_active = 1,	/* BT_WAKE active mode: 1 = high, 0 = low */
379 	.host_wake_active = 0,	/* HOST_WAKE active mode: 1 = high, 0 = low */
380 	.allow_host_sleep = 1,	/* Allow host sleep in SCO flag */
381 	.combine_modes = 1,	/* Combine sleep and LPM flag */
382 	.tristate_control = 0,	/* Allow tri-state control of UART tx flag */
383 	/* Irrelevant USB flags */
384 	.usb_auto_sleep = 0,
385 	.usb_resume_timeout = 0,
386 	.break_to_host = 0,
387 	.pulsed_host_wake = 1,
388 };
389 
bcm_setup_sleep(struct hci_uart * hu)390 static int bcm_setup_sleep(struct hci_uart *hu)
391 {
392 	struct bcm_data *bcm = hu->priv;
393 	struct sk_buff *skb;
394 	struct bcm_set_sleep_mode sleep_params = default_sleep_params;
395 
396 	sleep_params.host_wake_active = !bcm->dev->irq_active_low;
397 
398 	skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
399 			     &sleep_params, HCI_INIT_TIMEOUT);
400 	if (IS_ERR(skb)) {
401 		int err = PTR_ERR(skb);
402 		bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
403 		return err;
404 	}
405 	kfree_skb(skb);
406 
407 	bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
408 
409 	return 0;
410 }
411 #else
bcm_request_irq(struct bcm_data * bcm)412 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
bcm_setup_sleep(struct hci_uart * hu)413 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
414 #endif
415 
bcm_set_diag(struct hci_dev * hdev,bool enable)416 static int bcm_set_diag(struct hci_dev *hdev, bool enable)
417 {
418 	struct hci_uart *hu = hci_get_drvdata(hdev);
419 	struct bcm_data *bcm = hu->priv;
420 	struct sk_buff *skb;
421 
422 	if (!test_bit(HCI_RUNNING, &hdev->flags))
423 		return -ENETDOWN;
424 
425 	skb = bt_skb_alloc(3, GFP_KERNEL);
426 	if (!skb)
427 		return -ENOMEM;
428 
429 	skb_put_u8(skb, BCM_LM_DIAG_PKT);
430 	skb_put_u8(skb, 0xf0);
431 	skb_put_u8(skb, enable);
432 
433 	skb_queue_tail(&bcm->txq, skb);
434 	hci_uart_tx_wakeup(hu);
435 
436 	return 0;
437 }
438 
bcm_open(struct hci_uart * hu)439 static int bcm_open(struct hci_uart *hu)
440 {
441 	struct bcm_data *bcm;
442 	struct list_head *p;
443 	int err;
444 
445 	bt_dev_dbg(hu->hdev, "hu %p", hu);
446 
447 	if (!hci_uart_has_flow_control(hu))
448 		return -EOPNOTSUPP;
449 
450 	bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
451 	if (!bcm)
452 		return -ENOMEM;
453 
454 	skb_queue_head_init(&bcm->txq);
455 
456 	hu->priv = bcm;
457 
458 	mutex_lock(&bcm_device_lock);
459 
460 	if (hu->serdev) {
461 		bcm->dev = serdev_device_get_drvdata(hu->serdev);
462 		goto out;
463 	}
464 
465 	if (!hu->tty->dev)
466 		goto out;
467 
468 	list_for_each(p, &bcm_device_list) {
469 		struct bcm_device *dev = list_entry(p, struct bcm_device, list);
470 
471 		/* Retrieve saved bcm_device based on parent of the
472 		 * platform device (saved during device probe) and
473 		 * parent of tty device used by hci_uart
474 		 */
475 		if (hu->tty->dev->parent == dev->dev->parent) {
476 			bcm->dev = dev;
477 #ifdef CONFIG_PM
478 			dev->hu = hu;
479 #endif
480 			break;
481 		}
482 	}
483 
484 out:
485 	if (bcm->dev) {
486 		if (bcm->dev->use_autobaud_mode)
487 			hci_uart_set_flow_control(hu, false);	/* Assert BT_UART_CTS_N */
488 		else if (bcm->dev->drive_rts_on_open)
489 			hci_uart_set_flow_control(hu, true);
490 
491 		if (bcm->dev->use_autobaud_mode && bcm->dev->max_autobaud_speed)
492 			hu->init_speed = min(bcm->dev->oper_speed, bcm->dev->max_autobaud_speed);
493 		else
494 			hu->init_speed = bcm->dev->init_speed;
495 
496 		/* If oper_speed is set, ldisc/serdev will set the baudrate
497 		 * before calling setup()
498 		 */
499 		if (!bcm->dev->no_early_set_baudrate && !bcm->dev->use_autobaud_mode)
500 			hu->oper_speed = bcm->dev->oper_speed;
501 
502 		err = bcm_gpio_set_power(bcm->dev, true);
503 
504 		if (bcm->dev->drive_rts_on_open)
505 			hci_uart_set_flow_control(hu, false);
506 
507 		if (err)
508 			goto err_unset_hu;
509 	}
510 
511 	mutex_unlock(&bcm_device_lock);
512 	return 0;
513 
514 err_unset_hu:
515 #ifdef CONFIG_PM
516 	if (!hu->serdev)
517 		bcm->dev->hu = NULL;
518 #endif
519 	mutex_unlock(&bcm_device_lock);
520 	hu->priv = NULL;
521 	kfree(bcm);
522 	return err;
523 }
524 
bcm_close(struct hci_uart * hu)525 static int bcm_close(struct hci_uart *hu)
526 {
527 	struct bcm_data *bcm = hu->priv;
528 	struct bcm_device *bdev = NULL;
529 	int err;
530 
531 	bt_dev_dbg(hu->hdev, "hu %p", hu);
532 
533 	/* Protect bcm->dev against removal of the device or driver */
534 	mutex_lock(&bcm_device_lock);
535 
536 	if (hu->serdev) {
537 		bdev = serdev_device_get_drvdata(hu->serdev);
538 	} else if (bcm_device_exists(bcm->dev)) {
539 		bdev = bcm->dev;
540 #ifdef CONFIG_PM
541 		bdev->hu = NULL;
542 #endif
543 	}
544 
545 	if (bdev) {
546 		if (IS_ENABLED(CONFIG_PM) && bdev->irq_acquired) {
547 			devm_free_irq(bdev->dev, bdev->irq, bdev);
548 			device_init_wakeup(bdev->dev, false);
549 			pm_runtime_disable(bdev->dev);
550 		}
551 
552 		err = bcm_gpio_set_power(bdev, false);
553 		if (err)
554 			bt_dev_err(hu->hdev, "Failed to power down");
555 		else
556 			pm_runtime_set_suspended(bdev->dev);
557 	}
558 	mutex_unlock(&bcm_device_lock);
559 
560 	skb_queue_purge(&bcm->txq);
561 	kfree_skb(bcm->rx_skb);
562 	kfree(bcm);
563 
564 	hu->priv = NULL;
565 	return 0;
566 }
567 
bcm_flush(struct hci_uart * hu)568 static int bcm_flush(struct hci_uart *hu)
569 {
570 	struct bcm_data *bcm = hu->priv;
571 
572 	bt_dev_dbg(hu->hdev, "hu %p", hu);
573 
574 	skb_queue_purge(&bcm->txq);
575 
576 	return 0;
577 }
578 
bcm_setup(struct hci_uart * hu)579 static int bcm_setup(struct hci_uart *hu)
580 {
581 	struct bcm_data *bcm = hu->priv;
582 	bool fw_load_done = false;
583 	bool use_autobaud_mode = (bcm->dev ? bcm->dev->use_autobaud_mode : 0);
584 	unsigned int speed;
585 	int err;
586 
587 	bt_dev_dbg(hu->hdev, "hu %p", hu);
588 
589 	hu->hdev->set_diag = bcm_set_diag;
590 	hu->hdev->set_bdaddr = btbcm_set_bdaddr;
591 
592 	err = btbcm_initialize(hu->hdev, &fw_load_done, use_autobaud_mode);
593 	if (err)
594 		return err;
595 
596 	if (!fw_load_done)
597 		return 0;
598 
599 	/* Init speed if any */
600 	if (bcm->dev && bcm->dev->init_speed)
601 		speed = bcm->dev->init_speed;
602 	else if (hu->proto->init_speed)
603 		speed = hu->proto->init_speed;
604 	else
605 		speed = 0;
606 
607 	if (speed)
608 		host_set_baudrate(hu, speed);
609 
610 	/* Operational speed if any */
611 	if (hu->oper_speed)
612 		speed = hu->oper_speed;
613 	else if (bcm->dev && bcm->dev->oper_speed)
614 		speed = bcm->dev->oper_speed;
615 	else if (hu->proto->oper_speed)
616 		speed = hu->proto->oper_speed;
617 	else
618 		speed = 0;
619 
620 	if (speed) {
621 		err = bcm_set_baudrate(hu, speed);
622 		if (!err)
623 			host_set_baudrate(hu, speed);
624 	}
625 
626 	/* PCM parameters if provided */
627 	if (bcm->dev && bcm->dev->pcm_int_params[0] != 0xff) {
628 		struct bcm_set_pcm_int_params params;
629 
630 		btbcm_read_pcm_int_params(hu->hdev, &params);
631 
632 		memcpy(&params, bcm->dev->pcm_int_params, 5);
633 		btbcm_write_pcm_int_params(hu->hdev, &params);
634 	}
635 
636 	err = btbcm_finalize(hu->hdev, &fw_load_done, use_autobaud_mode);
637 	if (err)
638 		return err;
639 
640 	/* Some devices ship with the controller default address.
641 	 * Allow the bootloader to set a valid address through the
642 	 * device tree.
643 	 */
644 	set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hu->hdev->quirks);
645 
646 	if (!bcm_request_irq(bcm))
647 		err = bcm_setup_sleep(hu);
648 
649 	return err;
650 }
651 
652 #define BCM_RECV_LM_DIAG \
653 	.type = BCM_LM_DIAG_PKT, \
654 	.hlen = BCM_LM_DIAG_SIZE, \
655 	.loff = 0, \
656 	.lsize = 0, \
657 	.maxlen = BCM_LM_DIAG_SIZE
658 
659 #define BCM_RECV_NULL \
660 	.type = BCM_NULL_PKT, \
661 	.hlen = BCM_NULL_SIZE, \
662 	.loff = 0, \
663 	.lsize = 0, \
664 	.maxlen = BCM_NULL_SIZE
665 
666 #define BCM_RECV_TYPE49 \
667 	.type = BCM_TYPE49_PKT, \
668 	.hlen = BCM_TYPE49_SIZE, \
669 	.loff = 0, \
670 	.lsize = 0, \
671 	.maxlen = BCM_TYPE49_SIZE
672 
673 #define BCM_RECV_TYPE52 \
674 	.type = BCM_TYPE52_PKT, \
675 	.hlen = BCM_TYPE52_SIZE, \
676 	.loff = 0, \
677 	.lsize = 0, \
678 	.maxlen = BCM_TYPE52_SIZE
679 
680 static const struct h4_recv_pkt bcm_recv_pkts[] = {
681 	{ H4_RECV_ACL,      .recv = hci_recv_frame },
682 	{ H4_RECV_SCO,      .recv = hci_recv_frame },
683 	{ H4_RECV_EVENT,    .recv = hci_recv_frame },
684 	{ H4_RECV_ISO,      .recv = hci_recv_frame },
685 	{ BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
686 	{ BCM_RECV_NULL,    .recv = hci_recv_diag  },
687 	{ BCM_RECV_TYPE49,  .recv = hci_recv_diag  },
688 	{ BCM_RECV_TYPE52,  .recv = hci_recv_diag  },
689 };
690 
bcm_recv(struct hci_uart * hu,const void * data,int count)691 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
692 {
693 	struct bcm_data *bcm = hu->priv;
694 
695 	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
696 		return -EUNATCH;
697 
698 	bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
699 				  bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
700 	if (IS_ERR(bcm->rx_skb)) {
701 		int err = PTR_ERR(bcm->rx_skb);
702 		bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
703 		bcm->rx_skb = NULL;
704 		return err;
705 	} else if (!bcm->rx_skb) {
706 		/* Delay auto-suspend when receiving completed packet */
707 		mutex_lock(&bcm_device_lock);
708 		if (bcm->dev && bcm_device_exists(bcm->dev)) {
709 			pm_runtime_get(bcm->dev->dev);
710 			pm_runtime_mark_last_busy(bcm->dev->dev);
711 			pm_runtime_put_autosuspend(bcm->dev->dev);
712 		}
713 		mutex_unlock(&bcm_device_lock);
714 	}
715 
716 	return count;
717 }
718 
bcm_enqueue(struct hci_uart * hu,struct sk_buff * skb)719 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
720 {
721 	struct bcm_data *bcm = hu->priv;
722 
723 	bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
724 
725 	/* Prepend skb with frame type */
726 	memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
727 	skb_queue_tail(&bcm->txq, skb);
728 
729 	return 0;
730 }
731 
bcm_dequeue(struct hci_uart * hu)732 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
733 {
734 	struct bcm_data *bcm = hu->priv;
735 	struct sk_buff *skb = NULL;
736 	struct bcm_device *bdev = NULL;
737 
738 	mutex_lock(&bcm_device_lock);
739 
740 	if (bcm_device_exists(bcm->dev)) {
741 		bdev = bcm->dev;
742 		pm_runtime_get_sync(bdev->dev);
743 		/* Shall be resumed here */
744 	}
745 
746 	skb = skb_dequeue(&bcm->txq);
747 
748 	if (bdev) {
749 		pm_runtime_mark_last_busy(bdev->dev);
750 		pm_runtime_put_autosuspend(bdev->dev);
751 	}
752 
753 	mutex_unlock(&bcm_device_lock);
754 
755 	return skb;
756 }
757 
758 #ifdef CONFIG_PM
bcm_suspend_device(struct device * dev)759 static int bcm_suspend_device(struct device *dev)
760 {
761 	struct bcm_device *bdev = dev_get_drvdata(dev);
762 	int err;
763 
764 	bt_dev_dbg(bdev, "");
765 
766 	if (!bdev->is_suspended && bdev->hu) {
767 		hci_uart_set_flow_control(bdev->hu, true);
768 
769 		/* Once this returns, driver suspends BT via GPIO */
770 		bdev->is_suspended = true;
771 	}
772 
773 	/* Suspend the device */
774 	err = bdev->set_device_wakeup(bdev, false);
775 	if (err) {
776 		if (bdev->is_suspended && bdev->hu) {
777 			bdev->is_suspended = false;
778 			hci_uart_set_flow_control(bdev->hu, false);
779 		}
780 		return -EBUSY;
781 	}
782 
783 	bt_dev_dbg(bdev, "suspend, delaying 15 ms");
784 	msleep(15);
785 
786 	return 0;
787 }
788 
bcm_resume_device(struct device * dev)789 static int bcm_resume_device(struct device *dev)
790 {
791 	struct bcm_device *bdev = dev_get_drvdata(dev);
792 	int err;
793 
794 	bt_dev_dbg(bdev, "");
795 
796 	err = bdev->set_device_wakeup(bdev, true);
797 	if (err) {
798 		dev_err(dev, "Failed to power up\n");
799 		return err;
800 	}
801 
802 	bt_dev_dbg(bdev, "resume, delaying 15 ms");
803 	msleep(15);
804 
805 	/* When this executes, the device has woken up already */
806 	if (bdev->is_suspended && bdev->hu) {
807 		bdev->is_suspended = false;
808 
809 		hci_uart_set_flow_control(bdev->hu, false);
810 	}
811 
812 	return 0;
813 }
814 #endif
815 
816 #ifdef CONFIG_PM_SLEEP
817 /* suspend callback */
bcm_suspend(struct device * dev)818 static int bcm_suspend(struct device *dev)
819 {
820 	struct bcm_device *bdev = dev_get_drvdata(dev);
821 	int error;
822 
823 	bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
824 
825 	/*
826 	 * When used with a device instantiated as platform_device, bcm_suspend
827 	 * can be called at any time as long as the platform device is bound,
828 	 * so it should use bcm_device_lock to protect access to hci_uart
829 	 * and device_wake-up GPIO.
830 	 */
831 	mutex_lock(&bcm_device_lock);
832 
833 	if (!bdev->hu)
834 		goto unlock;
835 
836 	if (pm_runtime_active(dev))
837 		bcm_suspend_device(dev);
838 
839 	if (device_may_wakeup(dev) && bdev->irq > 0) {
840 		error = enable_irq_wake(bdev->irq);
841 		if (!error)
842 			bt_dev_dbg(bdev, "BCM irq: enabled");
843 	}
844 
845 unlock:
846 	mutex_unlock(&bcm_device_lock);
847 
848 	return 0;
849 }
850 
851 /* resume callback */
bcm_resume(struct device * dev)852 static int bcm_resume(struct device *dev)
853 {
854 	struct bcm_device *bdev = dev_get_drvdata(dev);
855 	int err = 0;
856 
857 	bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
858 
859 	/*
860 	 * When used with a device instantiated as platform_device, bcm_resume
861 	 * can be called at any time as long as platform device is bound,
862 	 * so it should use bcm_device_lock to protect access to hci_uart
863 	 * and device_wake-up GPIO.
864 	 */
865 	mutex_lock(&bcm_device_lock);
866 
867 	if (!bdev->hu)
868 		goto unlock;
869 
870 	if (device_may_wakeup(dev) && bdev->irq > 0) {
871 		disable_irq_wake(bdev->irq);
872 		bt_dev_dbg(bdev, "BCM irq: disabled");
873 	}
874 
875 	err = bcm_resume_device(dev);
876 
877 unlock:
878 	mutex_unlock(&bcm_device_lock);
879 
880 	if (!err) {
881 		pm_runtime_disable(dev);
882 		pm_runtime_set_active(dev);
883 		pm_runtime_enable(dev);
884 	}
885 
886 	return 0;
887 }
888 #endif
889 
890 /* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
891 static struct gpiod_lookup_table asus_tf103c_irq_gpios = {
892 	.dev_id = "serial0-0",
893 	.table = {
894 		GPIO_LOOKUP("INT33FC:02", 17, "host-wakeup-alt", GPIO_ACTIVE_HIGH),
895 		{ }
896 	},
897 };
898 
899 static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
900 	{
901 		.ident = "Asus TF103C",
902 		.matches = {
903 			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
904 			DMI_MATCH(DMI_PRODUCT_NAME, "TF103C"),
905 		},
906 		.driver_data = &asus_tf103c_irq_gpios,
907 	},
908 	{
909 		.ident = "Meegopad T08",
910 		.matches = {
911 			DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
912 					"To be filled by OEM."),
913 			DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
914 			DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
915 		},
916 	},
917 	{ }
918 };
919 
920 #ifdef CONFIG_ACPI
921 static const struct acpi_gpio_params first_gpio = { 0, 0, false };
922 static const struct acpi_gpio_params second_gpio = { 1, 0, false };
923 static const struct acpi_gpio_params third_gpio = { 2, 0, false };
924 
925 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
926 	{ "device-wakeup-gpios", &first_gpio, 1 },
927 	{ "shutdown-gpios", &second_gpio, 1 },
928 	{ "host-wakeup-gpios", &third_gpio, 1 },
929 	{ },
930 };
931 
932 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
933 	{ "host-wakeup-gpios", &first_gpio, 1 },
934 	{ "device-wakeup-gpios", &second_gpio, 1 },
935 	{ "shutdown-gpios", &third_gpio, 1 },
936 	{ },
937 };
938 
bcm_resource(struct acpi_resource * ares,void * data)939 static int bcm_resource(struct acpi_resource *ares, void *data)
940 {
941 	struct bcm_device *dev = data;
942 	struct acpi_resource_extended_irq *irq;
943 	struct acpi_resource_gpio *gpio;
944 	struct acpi_resource_uart_serialbus *sb;
945 
946 	switch (ares->type) {
947 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
948 		irq = &ares->data.extended_irq;
949 		if (irq->polarity != ACPI_ACTIVE_LOW)
950 			dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
951 		dev->irq_active_low = true;
952 		break;
953 
954 	case ACPI_RESOURCE_TYPE_GPIO:
955 		gpio = &ares->data.gpio;
956 		if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
957 			dev->gpio_int_idx = dev->gpio_count;
958 			dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
959 		}
960 		dev->gpio_count++;
961 		break;
962 
963 	case ACPI_RESOURCE_TYPE_SERIAL_BUS:
964 		sb = &ares->data.uart_serial_bus;
965 		if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
966 			dev->init_speed = sb->default_baud_rate;
967 			dev->oper_speed = 4000000;
968 		}
969 		break;
970 
971 	default:
972 		break;
973 	}
974 
975 	return 0;
976 }
977 
bcm_apple_set_device_wakeup(struct bcm_device * dev,bool awake)978 static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
979 {
980 	if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
981 		return -EIO;
982 
983 	return 0;
984 }
985 
bcm_apple_set_shutdown(struct bcm_device * dev,bool powered)986 static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
987 {
988 	if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
989 					      NULL, NULL, NULL)))
990 		return -EIO;
991 
992 	return 0;
993 }
994 
bcm_apple_get_resources(struct bcm_device * dev)995 static int bcm_apple_get_resources(struct bcm_device *dev)
996 {
997 	struct acpi_device *adev = ACPI_COMPANION(dev->dev);
998 	const union acpi_object *obj;
999 
1000 	if (!adev ||
1001 	    ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
1002 	    ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
1003 	    ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
1004 		return -ENODEV;
1005 
1006 	if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
1007 	    obj->buffer.length == 8)
1008 		dev->init_speed = *(u64 *)obj->buffer.pointer;
1009 
1010 	dev->set_device_wakeup = bcm_apple_set_device_wakeup;
1011 	dev->set_shutdown = bcm_apple_set_shutdown;
1012 
1013 	return 0;
1014 }
1015 #else
bcm_apple_get_resources(struct bcm_device * dev)1016 static inline int bcm_apple_get_resources(struct bcm_device *dev)
1017 {
1018 	return -EOPNOTSUPP;
1019 }
1020 #endif /* CONFIG_ACPI */
1021 
bcm_gpio_set_device_wakeup(struct bcm_device * dev,bool awake)1022 static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
1023 {
1024 	gpiod_set_value_cansleep(dev->device_wakeup, awake);
1025 	return 0;
1026 }
1027 
bcm_gpio_set_shutdown(struct bcm_device * dev,bool powered)1028 static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
1029 {
1030 	gpiod_set_value_cansleep(dev->shutdown, powered);
1031 	if (dev->reset)
1032 		/*
1033 		 * The reset line is asserted on powerdown and deasserted
1034 		 * on poweron so the inverse of powered is used. Notice
1035 		 * that the GPIO line BT_RST_N needs to be specified as
1036 		 * active low in the device tree or similar system
1037 		 * description.
1038 		 */
1039 		gpiod_set_value_cansleep(dev->reset, !powered);
1040 	return 0;
1041 }
1042 
1043 /* Try a bunch of names for TXCO */
bcm_get_txco(struct device * dev)1044 static struct clk *bcm_get_txco(struct device *dev)
1045 {
1046 	struct clk *clk;
1047 
1048 	/* New explicit name */
1049 	clk = devm_clk_get(dev, "txco");
1050 	if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
1051 		return clk;
1052 
1053 	/* Deprecated name */
1054 	clk = devm_clk_get(dev, "extclk");
1055 	if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
1056 		return clk;
1057 
1058 	/* Original code used no name at all */
1059 	return devm_clk_get(dev, NULL);
1060 }
1061 
bcm_get_resources(struct bcm_device * dev)1062 static int bcm_get_resources(struct bcm_device *dev)
1063 {
1064 	const struct dmi_system_id *broken_irq_dmi_id;
1065 	const char *irq_con_id = "host-wakeup";
1066 	int err;
1067 
1068 	dev->name = dev_name(dev->dev);
1069 
1070 	if (x86_apple_machine && !bcm_apple_get_resources(dev))
1071 		return 0;
1072 
1073 	dev->txco_clk = bcm_get_txco(dev->dev);
1074 
1075 	/* Handle deferred probing */
1076 	if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER))
1077 		return PTR_ERR(dev->txco_clk);
1078 
1079 	/* Ignore all other errors as before */
1080 	if (IS_ERR(dev->txco_clk))
1081 		dev->txco_clk = NULL;
1082 
1083 	dev->lpo_clk = devm_clk_get(dev->dev, "lpo");
1084 	if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER))
1085 		return PTR_ERR(dev->lpo_clk);
1086 
1087 	if (IS_ERR(dev->lpo_clk))
1088 		dev->lpo_clk = NULL;
1089 
1090 	/* Check if we accidentally fetched the lpo clock twice */
1091 	if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) {
1092 		devm_clk_put(dev->dev, dev->txco_clk);
1093 		dev->txco_clk = NULL;
1094 	}
1095 
1096 	dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
1097 						     GPIOD_OUT_LOW);
1098 	if (IS_ERR(dev->device_wakeup))
1099 		return PTR_ERR(dev->device_wakeup);
1100 
1101 	dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
1102 						GPIOD_OUT_LOW);
1103 	if (IS_ERR(dev->shutdown))
1104 		return PTR_ERR(dev->shutdown);
1105 
1106 	dev->reset = devm_gpiod_get_optional(dev->dev, "reset",
1107 					     GPIOD_OUT_LOW);
1108 	if (IS_ERR(dev->reset))
1109 		return PTR_ERR(dev->reset);
1110 
1111 	dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
1112 	dev->set_shutdown = bcm_gpio_set_shutdown;
1113 
1114 	dev->supplies[0].supply = "vbat";
1115 	dev->supplies[1].supply = "vddio";
1116 	err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
1117 				      dev->supplies);
1118 	if (err)
1119 		return err;
1120 
1121 	broken_irq_dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
1122 	if (broken_irq_dmi_id && broken_irq_dmi_id->driver_data) {
1123 		gpiod_add_lookup_table(broken_irq_dmi_id->driver_data);
1124 		irq_con_id = "host-wakeup-alt";
1125 		dev->irq_active_low = false;
1126 		dev->irq = 0;
1127 	}
1128 
1129 	/* IRQ can be declared in ACPI table as Interrupt or GpioInt */
1130 	if (dev->irq <= 0) {
1131 		struct gpio_desc *gpio;
1132 
1133 		gpio = devm_gpiod_get_optional(dev->dev, irq_con_id, GPIOD_IN);
1134 		if (IS_ERR(gpio))
1135 			return PTR_ERR(gpio);
1136 
1137 		dev->irq = gpiod_to_irq(gpio);
1138 	}
1139 
1140 	if (broken_irq_dmi_id) {
1141 		if (broken_irq_dmi_id->driver_data) {
1142 			gpiod_remove_lookup_table(broken_irq_dmi_id->driver_data);
1143 		} else {
1144 			dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
1145 				 broken_irq_dmi_id->ident);
1146 			dev->irq = 0;
1147 		}
1148 	}
1149 
1150 	dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
1151 	return 0;
1152 }
1153 
1154 #ifdef CONFIG_ACPI
bcm_acpi_probe(struct bcm_device * dev)1155 static int bcm_acpi_probe(struct bcm_device *dev)
1156 {
1157 	LIST_HEAD(resources);
1158 	const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
1159 	struct resource_entry *entry;
1160 	int ret;
1161 
1162 	/* Retrieve UART ACPI info */
1163 	dev->gpio_int_idx = -1;
1164 	ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
1165 				     &resources, bcm_resource, dev);
1166 	if (ret < 0)
1167 		return ret;
1168 
1169 	resource_list_for_each_entry(entry, &resources) {
1170 		if (resource_type(entry->res) == IORESOURCE_IRQ) {
1171 			dev->irq = entry->res->start;
1172 			break;
1173 		}
1174 	}
1175 	acpi_dev_free_resource_list(&resources);
1176 
1177 	/* If the DSDT uses an Interrupt resource for the IRQ, then there are
1178 	 * only 2 GPIO resources, we use the irq-last mapping for this, since
1179 	 * we already have an irq the 3th / last mapping will not be used.
1180 	 */
1181 	if (dev->irq)
1182 		gpio_mapping = acpi_bcm_int_last_gpios;
1183 	else if (dev->gpio_int_idx == 0)
1184 		gpio_mapping = acpi_bcm_int_first_gpios;
1185 	else if (dev->gpio_int_idx == 2)
1186 		gpio_mapping = acpi_bcm_int_last_gpios;
1187 	else
1188 		dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
1189 			 dev->gpio_int_idx);
1190 
1191 	/* Warn if our expectations are not met. */
1192 	if (dev->gpio_count != (dev->irq ? 2 : 3))
1193 		dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
1194 			 dev->gpio_count);
1195 
1196 	ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
1197 	if (ret)
1198 		return ret;
1199 
1200 	if (irq_polarity != -1) {
1201 		dev->irq_active_low = irq_polarity;
1202 		dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
1203 			 dev->irq_active_low ? "low" : "high");
1204 	}
1205 
1206 	return 0;
1207 }
1208 #else
bcm_acpi_probe(struct bcm_device * dev)1209 static int bcm_acpi_probe(struct bcm_device *dev)
1210 {
1211 	return -EINVAL;
1212 }
1213 #endif /* CONFIG_ACPI */
1214 
bcm_of_probe(struct bcm_device * bdev)1215 static int bcm_of_probe(struct bcm_device *bdev)
1216 {
1217 	bdev->use_autobaud_mode = device_property_read_bool(bdev->dev,
1218 							    "brcm,requires-autobaud-mode");
1219 	device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
1220 	device_property_read_u8_array(bdev->dev, "brcm,bt-pcm-int-params",
1221 				      bdev->pcm_int_params, 5);
1222 	bdev->irq = of_irq_get_byname(bdev->dev->of_node, "host-wakeup");
1223 	bdev->irq_active_low = irq_get_trigger_type(bdev->irq)
1224 			     & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW);
1225 	return 0;
1226 }
1227 
bcm_probe(struct platform_device * pdev)1228 static int bcm_probe(struct platform_device *pdev)
1229 {
1230 	struct bcm_device *dev;
1231 	int ret;
1232 
1233 	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1234 	if (!dev)
1235 		return -ENOMEM;
1236 
1237 	dev->dev = &pdev->dev;
1238 
1239 	ret = platform_get_irq(pdev, 0);
1240 	if (ret < 0)
1241 		return ret;
1242 
1243 	dev->irq = ret;
1244 
1245 	/* Initialize routing field to an unused value */
1246 	dev->pcm_int_params[0] = 0xff;
1247 
1248 	if (has_acpi_companion(&pdev->dev)) {
1249 		ret = bcm_acpi_probe(dev);
1250 		if (ret)
1251 			return ret;
1252 	}
1253 
1254 	ret = bcm_get_resources(dev);
1255 	if (ret)
1256 		return ret;
1257 
1258 	platform_set_drvdata(pdev, dev);
1259 
1260 	dev_info(&pdev->dev, "%s device registered.\n", dev->name);
1261 
1262 	/* Place this instance on the device list */
1263 	mutex_lock(&bcm_device_lock);
1264 	list_add_tail(&dev->list, &bcm_device_list);
1265 	mutex_unlock(&bcm_device_lock);
1266 
1267 	ret = bcm_gpio_set_power(dev, false);
1268 	if (ret)
1269 		dev_err(&pdev->dev, "Failed to power down\n");
1270 
1271 	return 0;
1272 }
1273 
bcm_remove(struct platform_device * pdev)1274 static int bcm_remove(struct platform_device *pdev)
1275 {
1276 	struct bcm_device *dev = platform_get_drvdata(pdev);
1277 
1278 	mutex_lock(&bcm_device_lock);
1279 	list_del(&dev->list);
1280 	mutex_unlock(&bcm_device_lock);
1281 
1282 	dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
1283 
1284 	return 0;
1285 }
1286 
1287 static const struct hci_uart_proto bcm_proto = {
1288 	.id		= HCI_UART_BCM,
1289 	.name		= "Broadcom",
1290 	.manufacturer	= 15,
1291 	.init_speed	= 115200,
1292 	.open		= bcm_open,
1293 	.close		= bcm_close,
1294 	.flush		= bcm_flush,
1295 	.setup		= bcm_setup,
1296 	.set_baudrate	= bcm_set_baudrate,
1297 	.recv		= bcm_recv,
1298 	.enqueue	= bcm_enqueue,
1299 	.dequeue	= bcm_dequeue,
1300 };
1301 
1302 #ifdef CONFIG_ACPI
1303 static const struct acpi_device_id bcm_acpi_match[] = {
1304 	{ "BCM2E00" },
1305 	{ "BCM2E01" },
1306 	{ "BCM2E02" },
1307 	{ "BCM2E03" },
1308 	{ "BCM2E04" },
1309 	{ "BCM2E05" },
1310 	{ "BCM2E06" },
1311 	{ "BCM2E07" },
1312 	{ "BCM2E08" },
1313 	{ "BCM2E09" },
1314 	{ "BCM2E0A" },
1315 	{ "BCM2E0B" },
1316 	{ "BCM2E0C" },
1317 	{ "BCM2E0D" },
1318 	{ "BCM2E0E" },
1319 	{ "BCM2E0F" },
1320 	{ "BCM2E10" },
1321 	{ "BCM2E11" },
1322 	{ "BCM2E12" },
1323 	{ "BCM2E13" },
1324 	{ "BCM2E14" },
1325 	{ "BCM2E15" },
1326 	{ "BCM2E16" },
1327 	{ "BCM2E17" },
1328 	{ "BCM2E18" },
1329 	{ "BCM2E19" },
1330 	{ "BCM2E1A" },
1331 	{ "BCM2E1B" },
1332 	{ "BCM2E1C" },
1333 	{ "BCM2E1D" },
1334 	{ "BCM2E1F" },
1335 	{ "BCM2E20" },
1336 	{ "BCM2E21" },
1337 	{ "BCM2E22" },
1338 	{ "BCM2E23" },
1339 	{ "BCM2E24" },
1340 	{ "BCM2E25" },
1341 	{ "BCM2E26" },
1342 	{ "BCM2E27" },
1343 	{ "BCM2E28" },
1344 	{ "BCM2E29" },
1345 	{ "BCM2E2A" },
1346 	{ "BCM2E2B" },
1347 	{ "BCM2E2C" },
1348 	{ "BCM2E2D" },
1349 	{ "BCM2E2E" },
1350 	{ "BCM2E2F" },
1351 	{ "BCM2E30" },
1352 	{ "BCM2E31" },
1353 	{ "BCM2E32" },
1354 	{ "BCM2E33" },
1355 	{ "BCM2E34" },
1356 	{ "BCM2E35" },
1357 	{ "BCM2E36" },
1358 	{ "BCM2E37" },
1359 	{ "BCM2E38" },
1360 	{ "BCM2E39" },
1361 	{ "BCM2E3A" },
1362 	{ "BCM2E3B" },
1363 	{ "BCM2E3C" },
1364 	{ "BCM2E3D" },
1365 	{ "BCM2E3E" },
1366 	{ "BCM2E3F" },
1367 	{ "BCM2E40" },
1368 	{ "BCM2E41" },
1369 	{ "BCM2E42" },
1370 	{ "BCM2E43" },
1371 	{ "BCM2E44" },
1372 	{ "BCM2E45" },
1373 	{ "BCM2E46" },
1374 	{ "BCM2E47" },
1375 	{ "BCM2E48" },
1376 	{ "BCM2E49" },
1377 	{ "BCM2E4A" },
1378 	{ "BCM2E4B" },
1379 	{ "BCM2E4C" },
1380 	{ "BCM2E4D" },
1381 	{ "BCM2E4E" },
1382 	{ "BCM2E4F" },
1383 	{ "BCM2E50" },
1384 	{ "BCM2E51" },
1385 	{ "BCM2E52" },
1386 	{ "BCM2E53" },
1387 	{ "BCM2E54" },
1388 	{ "BCM2E55" },
1389 	{ "BCM2E56" },
1390 	{ "BCM2E57" },
1391 	{ "BCM2E58" },
1392 	{ "BCM2E59" },
1393 	{ "BCM2E5A" },
1394 	{ "BCM2E5B" },
1395 	{ "BCM2E5C" },
1396 	{ "BCM2E5D" },
1397 	{ "BCM2E5E" },
1398 	{ "BCM2E5F" },
1399 	{ "BCM2E60" },
1400 	{ "BCM2E61" },
1401 	{ "BCM2E62" },
1402 	{ "BCM2E63" },
1403 	{ "BCM2E64" },
1404 	{ "BCM2E65" },
1405 	{ "BCM2E66" },
1406 	{ "BCM2E67" },
1407 	{ "BCM2E68" },
1408 	{ "BCM2E69" },
1409 	{ "BCM2E6B" },
1410 	{ "BCM2E6D" },
1411 	{ "BCM2E6E" },
1412 	{ "BCM2E6F" },
1413 	{ "BCM2E70" },
1414 	{ "BCM2E71" },
1415 	{ "BCM2E72" },
1416 	{ "BCM2E73" },
1417 	{ "BCM2E74" },
1418 	{ "BCM2E75" },
1419 	{ "BCM2E76" },
1420 	{ "BCM2E77" },
1421 	{ "BCM2E78" },
1422 	{ "BCM2E79" },
1423 	{ "BCM2E7A" },
1424 	{ "BCM2E7B" },
1425 	{ "BCM2E7C" },
1426 	{ "BCM2E7D" },
1427 	{ "BCM2E7E" },
1428 	{ "BCM2E7F" },
1429 	{ "BCM2E80" },
1430 	{ "BCM2E81" },
1431 	{ "BCM2E82" },
1432 	{ "BCM2E83" },
1433 	{ "BCM2E84" },
1434 	{ "BCM2E85" },
1435 	{ "BCM2E86" },
1436 	{ "BCM2E87" },
1437 	{ "BCM2E88" },
1438 	{ "BCM2E89" },
1439 	{ "BCM2E8A" },
1440 	{ "BCM2E8B" },
1441 	{ "BCM2E8C" },
1442 	{ "BCM2E8D" },
1443 	{ "BCM2E8E" },
1444 	{ "BCM2E90" },
1445 	{ "BCM2E92" },
1446 	{ "BCM2E93" },
1447 	{ "BCM2E94" },
1448 	{ "BCM2E95" },
1449 	{ "BCM2E96" },
1450 	{ "BCM2E97" },
1451 	{ "BCM2E98" },
1452 	{ "BCM2E99" },
1453 	{ "BCM2E9A" },
1454 	{ "BCM2E9B" },
1455 	{ "BCM2E9C" },
1456 	{ "BCM2E9D" },
1457 	{ "BCM2EA0" },
1458 	{ "BCM2EA1" },
1459 	{ "BCM2EA2" },
1460 	{ "BCM2EA3" },
1461 	{ "BCM2EA4" },
1462 	{ "BCM2EA5" },
1463 	{ "BCM2EA6" },
1464 	{ "BCM2EA7" },
1465 	{ "BCM2EA8" },
1466 	{ "BCM2EA9" },
1467 	{ "BCM2EAA" },
1468 	{ "BCM2EAB" },
1469 	{ "BCM2EAC" },
1470 	{ },
1471 };
1472 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
1473 #endif
1474 
1475 /* suspend and resume callbacks */
1476 static const struct dev_pm_ops bcm_pm_ops = {
1477 	SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
1478 	SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
1479 };
1480 
1481 static struct platform_driver bcm_driver = {
1482 	.probe = bcm_probe,
1483 	.remove = bcm_remove,
1484 	.driver = {
1485 		.name = "hci_bcm",
1486 		.acpi_match_table = ACPI_PTR(bcm_acpi_match),
1487 		.pm = &bcm_pm_ops,
1488 	},
1489 };
1490 
bcm_serdev_probe(struct serdev_device * serdev)1491 static int bcm_serdev_probe(struct serdev_device *serdev)
1492 {
1493 	struct bcm_device *bcmdev;
1494 	const struct bcm_device_data *data;
1495 	int err;
1496 
1497 	bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
1498 	if (!bcmdev)
1499 		return -ENOMEM;
1500 
1501 	bcmdev->dev = &serdev->dev;
1502 #ifdef CONFIG_PM
1503 	bcmdev->hu = &bcmdev->serdev_hu;
1504 #endif
1505 	bcmdev->serdev_hu.serdev = serdev;
1506 	serdev_device_set_drvdata(serdev, bcmdev);
1507 
1508 	/* Initialize routing field to an unused value */
1509 	bcmdev->pcm_int_params[0] = 0xff;
1510 
1511 	if (has_acpi_companion(&serdev->dev))
1512 		err = bcm_acpi_probe(bcmdev);
1513 	else
1514 		err = bcm_of_probe(bcmdev);
1515 	if (err)
1516 		return err;
1517 
1518 	err = bcm_get_resources(bcmdev);
1519 	if (err)
1520 		return err;
1521 
1522 	if (!bcmdev->shutdown) {
1523 		dev_warn(&serdev->dev,
1524 			 "No reset resource, using default baud rate\n");
1525 		bcmdev->oper_speed = bcmdev->init_speed;
1526 	}
1527 
1528 	err = bcm_gpio_set_power(bcmdev, false);
1529 	if (err)
1530 		dev_err(&serdev->dev, "Failed to power down\n");
1531 
1532 	data = device_get_match_data(bcmdev->dev);
1533 	if (data) {
1534 		bcmdev->max_autobaud_speed = data->max_autobaud_speed;
1535 		bcmdev->no_early_set_baudrate = data->no_early_set_baudrate;
1536 		bcmdev->drive_rts_on_open = data->drive_rts_on_open;
1537 		bcmdev->no_uart_clock_set = data->no_uart_clock_set;
1538 	}
1539 
1540 	return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
1541 }
1542 
bcm_serdev_remove(struct serdev_device * serdev)1543 static void bcm_serdev_remove(struct serdev_device *serdev)
1544 {
1545 	struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
1546 
1547 	hci_uart_unregister_device(&bcmdev->serdev_hu);
1548 }
1549 
1550 #ifdef CONFIG_OF
1551 static struct bcm_device_data bcm4354_device_data = {
1552 	.no_early_set_baudrate = true,
1553 };
1554 
1555 static struct bcm_device_data bcm43438_device_data = {
1556 	.drive_rts_on_open = true,
1557 };
1558 
1559 static struct bcm_device_data cyw4373a0_device_data = {
1560 	.no_uart_clock_set = true,
1561 };
1562 
1563 static struct bcm_device_data cyw55572_device_data = {
1564 	.max_autobaud_speed = 921600,
1565 };
1566 
1567 static const struct of_device_id bcm_bluetooth_of_match[] = {
1568 	{ .compatible = "brcm,bcm20702a1" },
1569 	{ .compatible = "brcm,bcm4329-bt" },
1570 	{ .compatible = "brcm,bcm4330-bt" },
1571 	{ .compatible = "brcm,bcm4334-bt" },
1572 	{ .compatible = "brcm,bcm4345c5" },
1573 	{ .compatible = "brcm,bcm43430a0-bt" },
1574 	{ .compatible = "brcm,bcm43430a1-bt" },
1575 	{ .compatible = "brcm,bcm43438-bt", .data = &bcm43438_device_data },
1576 	{ .compatible = "brcm,bcm4349-bt", .data = &bcm43438_device_data },
1577 	{ .compatible = "brcm,bcm43540-bt", .data = &bcm4354_device_data },
1578 	{ .compatible = "brcm,bcm4335a0" },
1579 	{ .compatible = "cypress,cyw4373a0-bt", .data = &cyw4373a0_device_data },
1580 	{ .compatible = "infineon,cyw55572-bt", .data = &cyw55572_device_data },
1581 	{ },
1582 };
1583 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
1584 #endif
1585 
1586 static struct serdev_device_driver bcm_serdev_driver = {
1587 	.probe = bcm_serdev_probe,
1588 	.remove = bcm_serdev_remove,
1589 	.driver = {
1590 		.name = "hci_uart_bcm",
1591 		.of_match_table = of_match_ptr(bcm_bluetooth_of_match),
1592 		.acpi_match_table = ACPI_PTR(bcm_acpi_match),
1593 		.pm = &bcm_pm_ops,
1594 	},
1595 };
1596 
bcm_init(void)1597 int __init bcm_init(void)
1598 {
1599 	/* For now, we need to keep both platform device
1600 	 * driver (ACPI generated) and serdev driver (DT).
1601 	 */
1602 	platform_driver_register(&bcm_driver);
1603 	serdev_device_driver_register(&bcm_serdev_driver);
1604 
1605 	return hci_uart_register_proto(&bcm_proto);
1606 }
1607 
bcm_deinit(void)1608 int __exit bcm_deinit(void)
1609 {
1610 	platform_driver_unregister(&bcm_driver);
1611 	serdev_device_driver_unregister(&bcm_serdev_driver);
1612 
1613 	return hci_uart_unregister_proto(&bcm_proto);
1614 }
1615