blob: 3eed35e0207c431b5bd2fbed1cbe0c3494c8c8e8 [file] [log] [blame]
Marcel Holtmanne9a2dd22015-04-04 16:13:03 -07001/*
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>
Frederic Danis18aeb442015-05-28 11:25:01 +020027#include <linux/firmware.h>
Frederic Danis0395ffc2015-08-11 16:35:35 +020028#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>
Frederic Danis6cc43962015-09-04 15:35:44 +020034#include <linux/interrupt.h>
Frederic Danis5cebdfe2015-09-23 18:18:08 +020035#include <linux/dmi.h>
Frederic Danise88ab302015-09-23 18:18:11 +020036#include <linux/pm_runtime.h>
Marcel Holtmanne9a2dd22015-04-04 16:13:03 -070037
38#include <net/bluetooth/bluetooth.h>
39#include <net/bluetooth/hci_core.h>
40
Marcel Holtmannbdd88182015-04-05 22:52:18 -070041#include "btbcm.h"
Marcel Holtmanne9a2dd22015-04-04 16:13:03 -070042#include "hci_uart.h"
Marcel Holtmannbdd88182015-04-05 22:52:18 -070043
Marcel Holtmann94c58132015-10-07 19:12:54 +020044#define BCM_LM_DIAG_PKT 0x07
45#define BCM_LM_DIAG_SIZE 63
46
Frederic Danise88ab302015-09-23 18:18:11 +020047#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
48
Frederic Danis0395ffc2015-08-11 16:35:35 +020049struct 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;
Frederic Danisae056902015-08-11 16:35:37 +020060
61 u32 init_speed;
Frederic Danis6cc43962015-09-04 15:35:44 +020062 int irq;
63 u8 irq_polarity;
Frederic Danis118612f2015-08-11 16:35:38 +020064
Frederic Danisb7a622a2015-09-23 18:18:09 +020065#ifdef CONFIG_PM
Frederic Danis118612f2015-08-11 16:35:38 +020066 struct hci_uart *hu;
67 bool is_suspended; /* suspend/resume flag */
68#endif
Marcel Holtmannbdd88182015-04-05 22:52:18 -070069};
70
Frederic Danis0395ffc2015-08-11 16:35:35 +020071struct 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 */
Frederic Danisbb3ea162015-09-01 12:13:35 +020079static DEFINE_MUTEX(bcm_device_lock);
Frederic Danis0395ffc2015-08-11 16:35:35 +020080static LIST_HEAD(bcm_device_list);
81
Frederic Danis61b2fc22015-06-09 16:15:37 +020082static 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
Frederic Danis65ad07c2015-09-01 12:13:36 +020093 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
Frederic Danis61b2fc22015-06-09 16:15:37 +020094
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);
Frederic Danis65ad07c2015-09-01 12:13:36 +0200101 bt_dev_err(hdev, "BCM: failed to write clock (%d)",
102 err);
Frederic Danis61b2fc22015-06-09 16:15:37 +0200103 return err;
104 }
105
106 kfree_skb(skb);
107 }
108
Frederic Danis65ad07c2015-09-01 12:13:36 +0200109 bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
Frederic Danis61b2fc22015-06-09 16:15:37 +0200110
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), &param,
118 HCI_INIT_TIMEOUT);
119 if (IS_ERR(skb)) {
120 int err = PTR_ERR(skb);
Frederic Danis65ad07c2015-09-01 12:13:36 +0200121 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
122 err);
Frederic Danis61b2fc22015-06-09 16:15:37 +0200123 return err;
124 }
125
126 kfree_skb(skb);
127
128 return 0;
129}
130
Frederic Danis917522a2015-08-28 15:44:00 +0200131/* bcm_device_exists should be protected by bcm_device_lock */
Frederic Danis0395ffc2015-08-11 16:35:35 +0200132static 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
Loic Poulain2af0a702015-08-17 16:00:21 +0200151 gpiod_set_value(dev->shutdown, powered);
152 gpiod_set_value(dev->device_wakeup, powered);
Frederic Danis0395ffc2015-08-11 16:35:35 +0200153
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
Frederic Danisb7a622a2015-09-23 18:18:09 +0200162#ifdef CONFIG_PM
Frederic Danis6cc43962015-09-04 15:35:44 +0200163static 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
Frederic Danise88ab302015-09-23 18:18:11 +0200169 pm_runtime_get(&bdev->pdev->dev);
170 pm_runtime_mark_last_busy(&bdev->pdev->dev);
171 pm_runtime_put_autosuspend(&bdev->pdev->dev);
172
Frederic Danis6cc43962015-09-04 15:35:44 +0200173 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);
Frederic Danise88ab302015-09-23 18:18:11 +0200196
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);
Frederic Danis6cc43962015-09-04 15:35:44 +0200202 }
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 */
Frederic Danise88ab302015-09-23 18:18:11 +0200217 .combine_modes = 1, /* Combine sleep and LPM flag */
Frederic Danis6cc43962015-09-04 15:35:44 +0200218 .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
Marcel Holtmann075e1f52015-10-07 20:08:26 +0200252static 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);
Dan Carpentera1857392015-10-22 12:06:09 +0300262 if (!skb)
263 return -ENOMEM;
Marcel Holtmann075e1f52015-10-07 20:08:26 +0200264
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
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700275static int bcm_open(struct hci_uart *hu)
276{
277 struct bcm_data *bcm;
Frederic Danis0395ffc2015-08-11 16:35:35 +0200278 struct list_head *p;
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700279
Frederic Danis65ad07c2015-09-01 12:13:36 +0200280 bt_dev_dbg(hu->hdev, "hu %p", hu);
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700281
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;
Frederic Danis0395ffc2015-08-11 16:35:35 +0200289
Frederic Danisbb3ea162015-09-01 12:13:35 +0200290 mutex_lock(&bcm_device_lock);
Frederic Danis0395ffc2015-08-11 16:35:35 +0200291 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;
Frederic Danisae056902015-08-11 16:35:37 +0200300 hu->init_speed = dev->init_speed;
Frederic Danisb7a622a2015-09-23 18:18:09 +0200301#ifdef CONFIG_PM
Frederic Danis118612f2015-08-11 16:35:38 +0200302 dev->hu = hu;
303#endif
Frederic Danis6cc43962015-09-04 15:35:44 +0200304 bcm_gpio_set_power(bcm->dev, true);
Frederic Danis0395ffc2015-08-11 16:35:35 +0200305 break;
306 }
307 }
308
Frederic Danisbb3ea162015-09-01 12:13:35 +0200309 mutex_unlock(&bcm_device_lock);
Frederic Danis0395ffc2015-08-11 16:35:35 +0200310
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700311 return 0;
312}
313
314static int bcm_close(struct hci_uart *hu)
315{
316 struct bcm_data *bcm = hu->priv;
Frederic Danis6cc43962015-09-04 15:35:44 +0200317 struct bcm_device *bdev = bcm->dev;
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700318
Frederic Danis65ad07c2015-09-01 12:13:36 +0200319 bt_dev_dbg(hu->hdev, "hu %p", hu);
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700320
Frederic Danis0395ffc2015-08-11 16:35:35 +0200321 /* Protect bcm->dev against removal of the device or driver */
Frederic Danisbb3ea162015-09-01 12:13:35 +0200322 mutex_lock(&bcm_device_lock);
Frederic Danis6cc43962015-09-04 15:35:44 +0200323 if (bcm_device_exists(bdev)) {
324 bcm_gpio_set_power(bdev, false);
Frederic Danisb7a622a2015-09-23 18:18:09 +0200325#ifdef CONFIG_PM
Frederic Danise88ab302015-09-23 18:18:11 +0200326 pm_runtime_disable(&bdev->pdev->dev);
327 pm_runtime_set_suspended(&bdev->pdev->dev);
328
Frederic Danis6cc43962015-09-04 15:35:44 +0200329 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;
Frederic Danis118612f2015-08-11 16:35:38 +0200335#endif
336 }
Frederic Danisbb3ea162015-09-01 12:13:35 +0200337 mutex_unlock(&bcm_device_lock);
Frederic Danis0395ffc2015-08-11 16:35:35 +0200338
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700339 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
Frederic Danis65ad07c2015-09-01 12:13:36 +0200351 bt_dev_dbg(hu->hdev, "hu %p", hu);
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700352
353 skb_queue_purge(&bcm->txq);
354
355 return 0;
356}
357
358static int bcm_setup(struct hci_uart *hu)
359{
Frederic Danis6cc43962015-09-04 15:35:44 +0200360 struct bcm_data *bcm = hu->priv;
Frederic Danis6be09b42015-05-28 11:25:05 +0200361 char fw_name[64];
362 const struct firmware *fw;
Frederic Danis960ef1d2015-06-18 12:43:27 +0200363 unsigned int speed;
Frederic Danis6be09b42015-05-28 11:25:05 +0200364 int err;
365
Frederic Danis65ad07c2015-09-01 12:13:36 +0200366 bt_dev_dbg(hu->hdev, "hu %p", hu);
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700367
Marcel Holtmann075e1f52015-10-07 20:08:26 +0200368 hu->hdev->set_diag = bcm_set_diag;
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700369 hu->hdev->set_bdaddr = btbcm_set_bdaddr;
370
Frederic Danis6be09b42015-05-28 11:25:05 +0200371 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) {
Frederic Danis65ad07c2015-09-01 12:13:36 +0200377 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
Frederic Danis6be09b42015-05-28 11:25:05 +0200378 return 0;
379 }
380
381 err = btbcm_patchram(hu->hdev, fw);
382 if (err) {
Frederic Danis65ad07c2015-09-01 12:13:36 +0200383 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
Frederic Danis6be09b42015-05-28 11:25:05 +0200384 goto finalize;
385 }
386
Frederic Danis960ef1d2015-06-18 12:43:27 +0200387 /* 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;
Frederic Danis6be09b42015-05-28 11:25:05 +0200394
Frederic Danis960ef1d2015-06-18 12:43:27 +0200395 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);
Frederic Danis61b2fc22015-06-09 16:15:37 +0200408 if (!err)
Frederic Danis960ef1d2015-06-18 12:43:27 +0200409 hci_uart_set_baudrate(hu, speed);
Frederic Danis61b2fc22015-06-09 16:15:37 +0200410 }
411
Frederic Danis6be09b42015-05-28 11:25:05 +0200412finalize:
413 release_firmware(fw);
414
415 err = btbcm_finalize(hu->hdev);
Frederic Danis6cc43962015-09-04 15:35:44 +0200416 if (err)
417 return err;
418
419 err = bcm_request_irq(bcm);
420 if (!err)
421 err = bcm_setup_sleep(hu);
Frederic Danis6be09b42015-05-28 11:25:05 +0200422
423 return err;
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700424}
425
Marcel Holtmann94c58132015-10-07 19:12:54 +0200426#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
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700433static const struct h4_recv_pkt bcm_recv_pkts[] = {
Marcel Holtmann94c58132015-10-07 19:12:54 +0200434 { 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 },
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700438};
439
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700440static 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
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700447 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
448 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700449 if (IS_ERR(bcm->rx_skb)) {
450 int err = PTR_ERR(bcm->rx_skb);
Frederic Danis65ad07c2015-09-01 12:13:36 +0200451 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
Chan-yeol Park37134162015-06-17 21:10:39 +0900452 bcm->rx_skb = NULL;
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700453 return err;
Frederic Danise88ab302015-09-23 18:18:11 +0200454 } 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);
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700463 }
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
Frederic Danis65ad07c2015-09-01 12:13:36 +0200472 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700473
474 /* Prepend skb with frame type */
Marcel Holtmann618e8bc2015-11-05 07:33:56 +0100475 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700476 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;
Frederic Danise88ab302015-09-23 18:18:11 +0200484 struct sk_buff *skb = NULL;
485 struct bcm_device *bdev = NULL;
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700486
Frederic Danise88ab302015-09-23 18:18:11 +0200487 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;
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700505}
506
Frederic Danisb7a622a2015-09-23 18:18:09 +0200507#ifdef CONFIG_PM
508static int bcm_suspend_device(struct device *dev)
Frederic Danis118612f2015-08-11 16:35:38 +0200509{
510 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
511
Frederic Danisb7a622a2015-09-23 18:18:09 +0200512 bt_dev_dbg(bdev, "");
Frederic Danis118612f2015-08-11 16:35:38 +0200513
Frederic Danisb7a622a2015-09-23 18:18:09 +0200514 if (!bdev->is_suspended && bdev->hu) {
Frederic Danis118612f2015-08-11 16:35:38 +0200515 hci_uart_set_flow_control(bdev->hu, true);
516
Frederic Danisb7a622a2015-09-23 18:18:09 +0200517 /* Once this returns, driver suspends BT via GPIO */
Frederic Danis118612f2015-08-11 16:35:38 +0200518 bdev->is_suspended = true;
519 }
520
521 /* Suspend the device */
522 if (bdev->device_wakeup) {
523 gpiod_set_value(bdev->device_wakeup, false);
Frederic Danis65ad07c2015-09-01 12:13:36 +0200524 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
Frederic Danis118612f2015-08-11 16:35:38 +0200525 mdelay(15);
526 }
527
Frederic Danisb7a622a2015-09-23 18:18:09 +0200528 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
Frederic Danise88ab302015-09-23 18:18:11 +0200572 if (pm_runtime_active(dev))
573 bcm_suspend_device(dev);
Frederic Danisb7a622a2015-09-23 18:18:09 +0200574
Frederic Danis6cc43962015-09-04 15:35:44 +0200575 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
Frederic Danis917522a2015-08-28 15:44:00 +0200581unlock:
Frederic Danisbb3ea162015-09-01 12:13:35 +0200582 mutex_unlock(&bcm_device_lock);
Frederic Danis917522a2015-08-28 15:44:00 +0200583
Frederic Danis118612f2015-08-11 16:35:38 +0200584 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
Frederic Danis65ad07c2015-09-01 12:13:36 +0200592 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
Frederic Danis118612f2015-08-11 16:35:38 +0200593
Frederic Danisb7a622a2015-09-23 18:18:09 +0200594 /* 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 */
Frederic Danisbb3ea162015-09-01 12:13:35 +0200598 mutex_lock(&bcm_device_lock);
Frederic Danis917522a2015-08-28 15:44:00 +0200599
600 if (!bdev->hu)
601 goto unlock;
602
Frederic Danis6cc43962015-09-04 15:35:44 +0200603 if (device_may_wakeup(&bdev->pdev->dev)) {
604 disable_irq_wake(bdev->irq);
605 bt_dev_dbg(bdev, "BCM irq: disabled");
606 }
607
Frederic Danisb7a622a2015-09-23 18:18:09 +0200608 bcm_resume_device(dev);
Frederic Danis118612f2015-08-11 16:35:38 +0200609
Frederic Danis917522a2015-08-28 15:44:00 +0200610unlock:
Frederic Danisbb3ea162015-09-01 12:13:35 +0200611 mutex_unlock(&bcm_device_lock);
Frederic Danis917522a2015-08-28 15:44:00 +0200612
Frederic Danise88ab302015-09-23 18:18:11 +0200613 pm_runtime_disable(dev);
614 pm_runtime_set_active(dev);
615 pm_runtime_enable(dev);
616
Frederic Danis118612f2015-08-11 16:35:38 +0200617 return 0;
618}
619#endif
620
Frederic Danis0395ffc2015-08-11 16:35:35 +0200621static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
622static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
Frederic Danis6cc43962015-09-04 15:35:44 +0200623static const struct acpi_gpio_params host_wakeup_gpios = { 2, 0, false };
Frederic Danis0395ffc2015-08-11 16:35:35 +0200624
625static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
626 { "device-wakeup-gpios", &device_wakeup_gpios, 1 },
627 { "shutdown-gpios", &shutdown_gpios, 1 },
Frederic Danis6cc43962015-09-04 15:35:44 +0200628 { "host-wakeup-gpios", &host_wakeup_gpios, 1 },
Frederic Danis0395ffc2015-08-11 16:35:35 +0200629 { },
630};
631
Frederic Danis50d78bc2015-08-12 12:46:01 +0200632#ifdef CONFIG_ACPI
Frederic Danis5cebdfe2015-09-23 18:18:08 +0200633static 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
Frederic Danisae056902015-08-11 16:35:37 +0200649static int bcm_resource(struct acpi_resource *ares, void *data)
650{
651 struct bcm_device *dev = data;
Frederic Danis6cc43962015-09-04 15:35:44 +0200652 struct acpi_resource_extended_irq *irq;
653 struct acpi_resource_gpio *gpio;
654 struct acpi_resource_uart_serialbus *sb;
Frederic Danisae056902015-08-11 16:35:37 +0200655
Frederic Danis6cc43962015-09-04 15:35:44 +0200656 switch (ares->type) {
657 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
658 irq = &ares->data.extended_irq;
659 dev->irq_polarity = irq->polarity;
660 break;
Frederic Danisae056902015-08-11 16:35:37 +0200661
Frederic Danis6cc43962015-09-04 15:35:44 +0200662 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:
Frederic Danisae056902015-08-11 16:35:37 +0200669 sb = &ares->data.uart_serial_bus;
670 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
671 dev->init_speed = sb->default_baud_rate;
Frederic Danis6cc43962015-09-04 15:35:44 +0200672 break;
673
674 default:
675 break;
Frederic Danisae056902015-08-11 16:35:37 +0200676 }
677
678 /* Always tell the ACPI core to skip this resource */
679 return 1;
680}
681
Frederic Danis0395ffc2015-08-11 16:35:35 +0200682static int bcm_acpi_probe(struct bcm_device *dev)
683{
684 struct platform_device *pdev = dev->pdev;
Frederic Danisae056902015-08-11 16:35:37 +0200685 LIST_HEAD(resources);
Frederic Danis5cebdfe2015-09-23 18:18:08 +0200686 const struct dmi_system_id *dmi_id;
Frederic Danis0395ffc2015-08-11 16:35:35 +0200687 int ret;
688
Frederic Danis0395ffc2015-08-11 16:35:35 +0200689 /* 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
Uwe Kleine-König62aaefa2015-08-12 09:20:56 +0200698 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);
Frederic Danis0395ffc2015-08-11 16:35:35 +0200703
Uwe Kleine-König62aaefa2015-08-12 09:20:56 +0200704 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);
Frederic Danis0395ffc2015-08-11 16:35:35 +0200708
Frederic Danis6cc43962015-09-04 15:35:44 +0200709 /* 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
Frederic Danis0395ffc2015-08-11 16:35:35 +0200724 /* 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
Frederic Danisae056902015-08-11 16:35:37 +0200732 /* Retrieve UART ACPI info */
Jarkko Nikulae98d6d62015-09-30 16:26:45 +0300733 ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev),
734 &resources, bcm_resource, dev);
Jarkko Nikula5be00282015-09-30 16:26:42 +0300735 if (ret < 0)
736 return ret;
Jarkko Nikula09dbf1b2015-09-30 16:26:41 +0300737 acpi_dev_free_resource_list(&resources);
Frederic Danisae056902015-08-11 16:35:37 +0200738
Frederic Danis5cebdfe2015-09-23 18:18:08 +0200739 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
Frederic Danis0395ffc2015-08-11 16:35:35 +0200746 return 0;
747}
Frederic Danis50d78bc2015-08-12 12:46:01 +0200748#else
749static int bcm_acpi_probe(struct bcm_device *dev)
750{
751 return -EINVAL;
752}
753#endif /* CONFIG_ACPI */
Frederic Danis0395ffc2015-08-11 16:35:35 +0200754
755static int bcm_probe(struct platform_device *pdev)
756{
757 struct bcm_device *dev;
Frederic Danis0395ffc2015-08-11 16:35:35 +0200758 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
Jarkko Nikula4d1c4552015-09-30 16:26:44 +0300766 ret = bcm_acpi_probe(dev);
767 if (ret)
768 return ret;
Frederic Danis0395ffc2015-08-11 16:35:35 +0200769
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 */
Frederic Danisbb3ea162015-09-01 12:13:35 +0200775 mutex_lock(&bcm_device_lock);
Frederic Danis0395ffc2015-08-11 16:35:35 +0200776 list_add_tail(&dev->list, &bcm_device_list);
Frederic Danisbb3ea162015-09-01 12:13:35 +0200777 mutex_unlock(&bcm_device_lock);
Frederic Danis0395ffc2015-08-11 16:35:35 +0200778
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
Frederic Danisbb3ea162015-09-01 12:13:35 +0200788 mutex_lock(&bcm_device_lock);
Frederic Danis0395ffc2015-08-11 16:35:35 +0200789 list_del(&dev->list);
Frederic Danisbb3ea162015-09-01 12:13:35 +0200790 mutex_unlock(&bcm_device_lock);
Frederic Danis0395ffc2015-08-11 16:35:35 +0200791
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
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700799static const struct hci_uart_proto bcm_proto = {
800 .id = HCI_UART_BCM,
801 .name = "BCM",
Marcel Holtmannaee61f72015-10-20 21:30:45 +0200802 .manufacturer = 15,
Frederic Danis61b2fc22015-06-09 16:15:37 +0200803 .init_speed = 115200,
804 .oper_speed = 4000000,
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700805 .open = bcm_open,
806 .close = bcm_close,
807 .flush = bcm_flush,
808 .setup = bcm_setup,
Frederic Danis61b2fc22015-06-09 16:15:37 +0200809 .set_baudrate = bcm_set_baudrate,
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700810 .recv = bcm_recv,
811 .enqueue = bcm_enqueue,
812 .dequeue = bcm_dequeue,
813};
814
Frederic Danis0395ffc2015-08-11 16:35:35 +0200815#ifdef CONFIG_ACPI
816static const struct acpi_device_id bcm_acpi_match[] = {
817 { "BCM2E39", 0 },
818 { "BCM2E67", 0 },
819 { },
820};
821MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
822#endif
823
Frederic Danis118612f2015-08-11 16:35:38 +0200824/* Platform suspend and resume callbacks */
Frederic Danise88ab302015-09-23 18:18:11 +0200825static const struct dev_pm_ops bcm_pm_ops = {
826 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
827 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
828};
Frederic Danis118612f2015-08-11 16:35:38 +0200829
Frederic Danis0395ffc2015-08-11 16:35:35 +0200830static struct platform_driver bcm_driver = {
831 .probe = bcm_probe,
832 .remove = bcm_remove,
833 .driver = {
834 .name = "hci_bcm",
835 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
Frederic Danis118612f2015-08-11 16:35:38 +0200836 .pm = &bcm_pm_ops,
Frederic Danis0395ffc2015-08-11 16:35:35 +0200837 },
838};
839
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700840int __init bcm_init(void)
841{
Frederic Danis0395ffc2015-08-11 16:35:35 +0200842 platform_driver_register(&bcm_driver);
843
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700844 return hci_uart_register_proto(&bcm_proto);
845}
846
847int __exit bcm_deinit(void)
848{
Frederic Danis0395ffc2015-08-11 16:35:35 +0200849 platform_driver_unregister(&bcm_driver);
850
Marcel Holtmannbdd88182015-04-05 22:52:18 -0700851 return hci_uart_unregister_proto(&bcm_proto);
852}