Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7dec65c8 JH |
2 | /* |
3 | * | |
4 | * Bluetooth HCI Three-wire UART driver | |
5 | * | |
6 | * Copyright (C) 2012 Intel Corporation | |
7dec65c8 JH |
7 | */ |
8 | ||
4eb3cbc4 | 9 | #include <linux/acpi.h> |
7dec65c8 | 10 | #include <linux/errno.h> |
4c791489 | 11 | #include <linux/gpio/consumer.h> |
4eb3cbc4 JC |
12 | #include <linux/kernel.h> |
13 | #include <linux/mod_devicetable.h> | |
848fc616 | 14 | #include <linux/of_device.h> |
d9dd833c | 15 | #include <linux/pm_runtime.h> |
ce945552 | 16 | #include <linux/serdev.h> |
7dec65c8 JH |
17 | #include <linux/skbuff.h> |
18 | ||
19 | #include <net/bluetooth/bluetooth.h> | |
20 | #include <net/bluetooth/hci_core.h> | |
21 | ||
b825d7c4 | 22 | #include "btrtl.h" |
7dec65c8 JH |
23 | #include "hci_uart.h" |
24 | ||
d9dd833c AP |
25 | #define SUSPEND_TIMEOUT_MS 6000 |
26 | ||
c0a1b73c JH |
27 | #define HCI_3WIRE_ACK_PKT 0 |
28 | #define HCI_3WIRE_LINK_PKT 15 | |
29 | ||
afdc944c JH |
30 | /* Sliding window size */ |
31 | #define H5_TX_WIN_MAX 4 | |
3f27e95b JH |
32 | |
33 | #define H5_ACK_TIMEOUT msecs_to_jiffies(250) | |
40f10224 | 34 | #define H5_SYNC_TIMEOUT msecs_to_jiffies(100) |
3f27e95b | 35 | |
bc1f35b9 JH |
36 | /* |
37 | * Maximum Three-wire packet: | |
38 | * 4 byte header + max value for 12-bit length + 2 bytes for CRC | |
39 | */ | |
40 | #define H5_MAX_LEN (4 + 0xfff + 2) | |
41 | ||
01977c0b JH |
42 | /* Convenience macros for reading Three-wire header values */ |
43 | #define H5_HDR_SEQ(hdr) ((hdr)[0] & 0x07) | |
44 | #define H5_HDR_ACK(hdr) (((hdr)[0] >> 3) & 0x07) | |
45 | #define H5_HDR_CRC(hdr) (((hdr)[0] >> 6) & 0x01) | |
46 | #define H5_HDR_RELIABLE(hdr) (((hdr)[0] >> 7) & 0x01) | |
47 | #define H5_HDR_PKT_TYPE(hdr) ((hdr)[1] & 0x0f) | |
4223f368 | 48 | #define H5_HDR_LEN(hdr) ((((hdr)[1] >> 4) & 0x0f) + ((hdr)[2] << 4)) |
01977c0b | 49 | |
bc1f35b9 JH |
50 | #define SLIP_DELIMITER 0xc0 |
51 | #define SLIP_ESC 0xdb | |
52 | #define SLIP_ESC_DELIM 0xdc | |
53 | #define SLIP_ESC_ESC 0xdd | |
54 | ||
e0482103 JH |
55 | /* H5 state flags */ |
56 | enum { | |
66f077dd AP |
57 | H5_RX_ESC, /* SLIP escape mode */ |
58 | H5_TX_ACK_REQ, /* Pending ack to send */ | |
59 | H5_WAKEUP_DISABLE, /* Device cannot wake host */ | |
30f11dda | 60 | H5_HW_FLOW_CONTROL, /* Use HW flow control */ |
e0482103 JH |
61 | }; |
62 | ||
7d664fba | 63 | struct h5 { |
ce945552 HG |
64 | /* Must be the first member, hci_serdev.c expects this. */ |
65 | struct hci_uart serdev_hu; | |
66 | ||
bc1f35b9 JH |
67 | struct sk_buff_head unack; /* Unack'ed packets queue */ |
68 | struct sk_buff_head rel; /* Reliable packets queue */ | |
69 | struct sk_buff_head unrel; /* Unreliable packets queue */ | |
70 | ||
e0482103 JH |
71 | unsigned long flags; |
72 | ||
bc1f35b9 JH |
73 | struct sk_buff *rx_skb; /* Receive buffer */ |
74 | size_t rx_pending; /* Expecting more bytes */ | |
43eb12d7 | 75 | u8 rx_ack; /* Last ack number received */ |
7d664fba | 76 | |
fa4cf04e | 77 | int (*rx_func)(struct hci_uart *hu, u8 c); |
7d664fba | 78 | |
bc1f35b9 | 79 | struct timer_list timer; /* Retransmission timer */ |
04356052 | 80 | struct hci_uart *hu; /* Parent HCI UART */ |
3f27e95b | 81 | |
43eb12d7 | 82 | u8 tx_seq; /* Next seq number to send */ |
40f10224 | 83 | u8 tx_ack; /* Next ack number to send */ |
afdc944c | 84 | u8 tx_win; /* Sliding window size */ |
10122d07 | 85 | |
f674a057 JH |
86 | enum { |
87 | H5_UNINITIALIZED, | |
88 | H5_INITIALIZED, | |
89 | H5_ACTIVE, | |
90 | } state; | |
91 | ||
95c5c220 JH |
92 | enum { |
93 | H5_AWAKE, | |
94 | H5_SLEEPING, | |
95 | H5_WAKING_UP, | |
96 | } sleep; | |
4eb3cbc4 JC |
97 | |
98 | const struct h5_vnd *vnd; | |
99 | const char *id; | |
4c791489 HG |
100 | |
101 | struct gpio_desc *enable_gpio; | |
102 | struct gpio_desc *device_wake_gpio; | |
4eb3cbc4 JC |
103 | }; |
104 | ||
66f077dd AP |
105 | enum h5_driver_info { |
106 | H5_INFO_WAKEUP_DISABLE = BIT(0), | |
107 | }; | |
108 | ||
4eb3cbc4 JC |
109 | struct h5_vnd { |
110 | int (*setup)(struct h5 *h5); | |
111 | void (*open)(struct h5 *h5); | |
112 | void (*close)(struct h5 *h5); | |
28a75e4c HG |
113 | int (*suspend)(struct h5 *h5); |
114 | int (*resume)(struct h5 *h5); | |
4c791489 | 115 | const struct acpi_gpio_mapping *acpi_gpio_map; |
7d664fba JH |
116 | }; |
117 | ||
66f077dd AP |
118 | struct h5_device_data { |
119 | uint32_t driver_info; | |
120 | struct h5_vnd *vnd; | |
121 | }; | |
122 | ||
bc1f35b9 JH |
123 | static void h5_reset_rx(struct h5 *h5); |
124 | ||
f674a057 JH |
125 | static void h5_link_control(struct hci_uart *hu, const void *data, size_t len) |
126 | { | |
127 | struct h5 *h5 = hu->priv; | |
128 | struct sk_buff *nskb; | |
129 | ||
130 | nskb = alloc_skb(3, GFP_ATOMIC); | |
131 | if (!nskb) | |
132 | return; | |
133 | ||
618e8bc2 | 134 | hci_skb_pkt_type(nskb) = HCI_3WIRE_LINK_PKT; |
f674a057 | 135 | |
59ae1d12 | 136 | skb_put_data(nskb, data, len); |
f674a057 JH |
137 | |
138 | skb_queue_tail(&h5->unrel, nskb); | |
139 | } | |
140 | ||
afdc944c JH |
141 | static u8 h5_cfg_field(struct h5 *h5) |
142 | { | |
afdc944c | 143 | /* Sliding window size (first 3 bits) */ |
742c5951 | 144 | return h5->tx_win & 0x07; |
afdc944c JH |
145 | } |
146 | ||
04356052 | 147 | static void h5_timed_event(struct timer_list *t) |
3f27e95b | 148 | { |
f674a057 | 149 | const unsigned char sync_req[] = { 0x01, 0x7e }; |
87a6b9bd | 150 | unsigned char conf_req[3] = { 0x03, 0xfc }; |
04356052 KC |
151 | struct h5 *h5 = from_timer(h5, t, timer); |
152 | struct hci_uart *hu = h5->hu; | |
3f27e95b JH |
153 | struct sk_buff *skb; |
154 | unsigned long flags; | |
155 | ||
95c5c220 JH |
156 | BT_DBG("%s", hu->hdev->name); |
157 | ||
f674a057 JH |
158 | if (h5->state == H5_UNINITIALIZED) |
159 | h5_link_control(hu, sync_req, sizeof(sync_req)); | |
160 | ||
afdc944c JH |
161 | if (h5->state == H5_INITIALIZED) { |
162 | conf_req[2] = h5_cfg_field(h5); | |
f674a057 | 163 | h5_link_control(hu, conf_req, sizeof(conf_req)); |
afdc944c | 164 | } |
f674a057 JH |
165 | |
166 | if (h5->state != H5_ACTIVE) { | |
167 | mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT); | |
168 | goto wakeup; | |
169 | } | |
170 | ||
95c5c220 JH |
171 | if (h5->sleep != H5_AWAKE) { |
172 | h5->sleep = H5_SLEEPING; | |
173 | goto wakeup; | |
174 | } | |
175 | ||
3f27e95b JH |
176 | BT_DBG("hu %p retransmitting %u pkts", hu, h5->unack.qlen); |
177 | ||
178 | spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING); | |
179 | ||
180 | while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) { | |
43eb12d7 | 181 | h5->tx_seq = (h5->tx_seq - 1) & 0x07; |
3f27e95b JH |
182 | skb_queue_head(&h5->rel, skb); |
183 | } | |
184 | ||
185 | spin_unlock_irqrestore(&h5->unack.lock, flags); | |
186 | ||
f674a057 | 187 | wakeup: |
3f27e95b JH |
188 | hci_uart_tx_wakeup(hu); |
189 | } | |
190 | ||
b509c02d LP |
191 | static void h5_peer_reset(struct hci_uart *hu) |
192 | { | |
193 | struct h5 *h5 = hu->priv; | |
b509c02d | 194 | |
bb0084ec | 195 | bt_dev_err(hu->hdev, "Peer device has reset"); |
b509c02d LP |
196 | |
197 | h5->state = H5_UNINITIALIZED; | |
198 | ||
199 | del_timer(&h5->timer); | |
200 | ||
201 | skb_queue_purge(&h5->rel); | |
202 | skb_queue_purge(&h5->unrel); | |
203 | skb_queue_purge(&h5->unack); | |
204 | ||
205 | h5->tx_seq = 0; | |
206 | h5->tx_ack = 0; | |
207 | ||
882809fb MH |
208 | /* Send reset request to upper stack */ |
209 | hci_reset_dev(hu->hdev); | |
b509c02d LP |
210 | } |
211 | ||
7dec65c8 JH |
212 | static int h5_open(struct hci_uart *hu) |
213 | { | |
7d664fba | 214 | struct h5 *h5; |
40f10224 | 215 | const unsigned char sync[] = { 0x01, 0x7e }; |
7d664fba JH |
216 | |
217 | BT_DBG("hu %p", hu); | |
218 | ||
ce945552 HG |
219 | if (hu->serdev) { |
220 | h5 = serdev_device_get_drvdata(hu->serdev); | |
221 | } else { | |
222 | h5 = kzalloc(sizeof(*h5), GFP_KERNEL); | |
223 | if (!h5) | |
224 | return -ENOMEM; | |
225 | } | |
7d664fba JH |
226 | |
227 | hu->priv = h5; | |
04356052 | 228 | h5->hu = hu; |
7d664fba JH |
229 | |
230 | skb_queue_head_init(&h5->unack); | |
231 | skb_queue_head_init(&h5->rel); | |
232 | skb_queue_head_init(&h5->unrel); | |
233 | ||
bc1f35b9 JH |
234 | h5_reset_rx(h5); |
235 | ||
04356052 | 236 | timer_setup(&h5->timer, h5_timed_event, 0); |
3f27e95b | 237 | |
afdc944c JH |
238 | h5->tx_win = H5_TX_WIN_MAX; |
239 | ||
4eb3cbc4 JC |
240 | if (h5->vnd && h5->vnd->open) |
241 | h5->vnd->open(h5); | |
242 | ||
cd1b4425 JH |
243 | set_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags); |
244 | ||
40f10224 JH |
245 | /* Send initial sync request */ |
246 | h5_link_control(hu, sync, sizeof(sync)); | |
247 | mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT); | |
248 | ||
7d664fba | 249 | return 0; |
7dec65c8 JH |
250 | } |
251 | ||
252 | static int h5_close(struct hci_uart *hu) | |
253 | { | |
7d664fba JH |
254 | struct h5 *h5 = hu->priv; |
255 | ||
c327cddd MK |
256 | del_timer_sync(&h5->timer); |
257 | ||
7d664fba JH |
258 | skb_queue_purge(&h5->unack); |
259 | skb_queue_purge(&h5->rel); | |
260 | skb_queue_purge(&h5->unrel); | |
261 | ||
855af2d7 AT |
262 | kfree_skb(h5->rx_skb); |
263 | h5->rx_skb = NULL; | |
264 | ||
4eb3cbc4 JC |
265 | if (h5->vnd && h5->vnd->close) |
266 | h5->vnd->close(h5); | |
267 | ||
5c3b5796 HG |
268 | if (!hu->serdev) |
269 | kfree(h5); | |
7d664fba JH |
270 | |
271 | return 0; | |
7dec65c8 JH |
272 | } |
273 | ||
4eb3cbc4 JC |
274 | static int h5_setup(struct hci_uart *hu) |
275 | { | |
276 | struct h5 *h5 = hu->priv; | |
277 | ||
278 | if (h5->vnd && h5->vnd->setup) | |
279 | return h5->vnd->setup(h5); | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
43eb12d7 JH |
284 | static void h5_pkt_cull(struct h5 *h5) |
285 | { | |
286 | struct sk_buff *skb, *tmp; | |
287 | unsigned long flags; | |
288 | int i, to_remove; | |
289 | u8 seq; | |
290 | ||
291 | spin_lock_irqsave(&h5->unack.lock, flags); | |
292 | ||
293 | to_remove = skb_queue_len(&h5->unack); | |
40f10224 JH |
294 | if (to_remove == 0) |
295 | goto unlock; | |
43eb12d7 JH |
296 | |
297 | seq = h5->tx_seq; | |
298 | ||
299 | while (to_remove > 0) { | |
300 | if (h5->rx_ack == seq) | |
301 | break; | |
302 | ||
303 | to_remove--; | |
4807b518 | 304 | seq = (seq - 1) & 0x07; |
43eb12d7 JH |
305 | } |
306 | ||
307 | if (seq != h5->rx_ack) | |
308 | BT_ERR("Controller acked invalid packet"); | |
309 | ||
310 | i = 0; | |
311 | skb_queue_walk_safe(&h5->unack, skb, tmp) { | |
312 | if (i++ >= to_remove) | |
313 | break; | |
314 | ||
315 | __skb_unlink(skb, &h5->unack); | |
383630cc | 316 | dev_kfree_skb_irq(skb); |
43eb12d7 JH |
317 | } |
318 | ||
319 | if (skb_queue_empty(&h5->unack)) | |
320 | del_timer(&h5->timer); | |
321 | ||
40f10224 | 322 | unlock: |
43eb12d7 JH |
323 | spin_unlock_irqrestore(&h5->unack.lock, flags); |
324 | } | |
325 | ||
bc1f35b9 JH |
326 | static void h5_handle_internal_rx(struct hci_uart *hu) |
327 | { | |
40f10224 JH |
328 | struct h5 *h5 = hu->priv; |
329 | const unsigned char sync_req[] = { 0x01, 0x7e }; | |
330 | const unsigned char sync_rsp[] = { 0x02, 0x7d }; | |
87a6b9bd | 331 | unsigned char conf_req[3] = { 0x03, 0xfc }; |
afdc944c | 332 | const unsigned char conf_rsp[] = { 0x04, 0x7b }; |
10122d07 JH |
333 | const unsigned char wakeup_req[] = { 0x05, 0xfa }; |
334 | const unsigned char woken_req[] = { 0x06, 0xf9 }; | |
335 | const unsigned char sleep_req[] = { 0x07, 0x78 }; | |
40f10224 JH |
336 | const unsigned char *hdr = h5->rx_skb->data; |
337 | const unsigned char *data = &h5->rx_skb->data[4]; | |
338 | ||
bc1f35b9 | 339 | BT_DBG("%s", hu->hdev->name); |
40f10224 JH |
340 | |
341 | if (H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) | |
342 | return; | |
343 | ||
344 | if (H5_HDR_LEN(hdr) < 2) | |
345 | return; | |
346 | ||
afdc944c JH |
347 | conf_req[2] = h5_cfg_field(h5); |
348 | ||
40f10224 | 349 | if (memcmp(data, sync_req, 2) == 0) { |
b509c02d LP |
350 | if (h5->state == H5_ACTIVE) |
351 | h5_peer_reset(hu); | |
40f10224 JH |
352 | h5_link_control(hu, sync_rsp, 2); |
353 | } else if (memcmp(data, sync_rsp, 2) == 0) { | |
b509c02d LP |
354 | if (h5->state == H5_ACTIVE) |
355 | h5_peer_reset(hu); | |
f674a057 | 356 | h5->state = H5_INITIALIZED; |
40f10224 JH |
357 | h5_link_control(hu, conf_req, 3); |
358 | } else if (memcmp(data, conf_req, 2) == 0) { | |
359 | h5_link_control(hu, conf_rsp, 2); | |
360 | h5_link_control(hu, conf_req, 3); | |
361 | } else if (memcmp(data, conf_rsp, 2) == 0) { | |
afdc944c | 362 | if (H5_HDR_LEN(hdr) > 2) |
1d3a1e69 | 363 | h5->tx_win = (data[2] & 0x07); |
afdc944c | 364 | BT_DBG("Three-wire init complete. tx_win %u", h5->tx_win); |
f674a057 | 365 | h5->state = H5_ACTIVE; |
cd1b4425 | 366 | hci_uart_init_ready(hu); |
40f10224 | 367 | return; |
10122d07 JH |
368 | } else if (memcmp(data, sleep_req, 2) == 0) { |
369 | BT_DBG("Peer went to sleep"); | |
95c5c220 JH |
370 | h5->sleep = H5_SLEEPING; |
371 | return; | |
10122d07 JH |
372 | } else if (memcmp(data, woken_req, 2) == 0) { |
373 | BT_DBG("Peer woke up"); | |
95c5c220 JH |
374 | h5->sleep = H5_AWAKE; |
375 | } else if (memcmp(data, wakeup_req, 2) == 0) { | |
376 | BT_DBG("Peer requested wakeup"); | |
377 | h5_link_control(hu, woken_req, 2); | |
378 | h5->sleep = H5_AWAKE; | |
40f10224 JH |
379 | } else { |
380 | BT_DBG("Link Control: 0x%02hhx 0x%02hhx", data[0], data[1]); | |
381 | return; | |
382 | } | |
383 | ||
384 | hci_uart_tx_wakeup(hu); | |
bc1f35b9 JH |
385 | } |
386 | ||
387 | static void h5_complete_rx_pkt(struct hci_uart *hu) | |
388 | { | |
389 | struct h5 *h5 = hu->priv; | |
43eb12d7 | 390 | const unsigned char *hdr = h5->rx_skb->data; |
bc1f35b9 | 391 | |
43eb12d7 | 392 | if (H5_HDR_RELIABLE(hdr)) { |
40f10224 | 393 | h5->tx_ack = (h5->tx_ack + 1) % 8; |
e0482103 | 394 | set_bit(H5_TX_ACK_REQ, &h5->flags); |
40f10224 | 395 | hci_uart_tx_wakeup(hu); |
43eb12d7 | 396 | } |
bc1f35b9 | 397 | |
43eb12d7 JH |
398 | h5->rx_ack = H5_HDR_ACK(hdr); |
399 | ||
400 | h5_pkt_cull(h5); | |
401 | ||
402 | switch (H5_HDR_PKT_TYPE(hdr)) { | |
bc1f35b9 JH |
403 | case HCI_EVENT_PKT: |
404 | case HCI_ACLDATA_PKT: | |
405 | case HCI_SCODATA_PKT: | |
1cc3c10c | 406 | case HCI_ISODATA_PKT: |
618e8bc2 | 407 | hci_skb_pkt_type(h5->rx_skb) = H5_HDR_PKT_TYPE(hdr); |
bc1f35b9 JH |
408 | |
409 | /* Remove Three-wire header */ | |
410 | skb_pull(h5->rx_skb, 4); | |
411 | ||
e1a26170 | 412 | hci_recv_frame(hu->hdev, h5->rx_skb); |
bc1f35b9 JH |
413 | h5->rx_skb = NULL; |
414 | ||
415 | break; | |
416 | ||
417 | default: | |
418 | h5_handle_internal_rx(hu); | |
419 | break; | |
420 | } | |
421 | ||
422 | h5_reset_rx(h5); | |
423 | } | |
424 | ||
425 | static int h5_rx_crc(struct hci_uart *hu, unsigned char c) | |
426 | { | |
bc1f35b9 | 427 | h5_complete_rx_pkt(hu); |
bc1f35b9 JH |
428 | |
429 | return 0; | |
430 | } | |
431 | ||
432 | static int h5_rx_payload(struct hci_uart *hu, unsigned char c) | |
433 | { | |
434 | struct h5 *h5 = hu->priv; | |
435 | const unsigned char *hdr = h5->rx_skb->data; | |
436 | ||
43eb12d7 | 437 | if (H5_HDR_CRC(hdr)) { |
bc1f35b9 JH |
438 | h5->rx_func = h5_rx_crc; |
439 | h5->rx_pending = 2; | |
440 | } else { | |
441 | h5_complete_rx_pkt(hu); | |
bc1f35b9 JH |
442 | } |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c) | |
448 | { | |
449 | struct h5 *h5 = hu->priv; | |
450 | const unsigned char *hdr = h5->rx_skb->data; | |
451 | ||
40f10224 JH |
452 | BT_DBG("%s rx: seq %u ack %u crc %u rel %u type %u len %u", |
453 | hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr), | |
454 | H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr), | |
455 | H5_HDR_LEN(hdr)); | |
456 | ||
bc1f35b9 | 457 | if (((hdr[0] + hdr[1] + hdr[2] + hdr[3]) & 0xff) != 0xff) { |
bb0084ec | 458 | bt_dev_err(hu->hdev, "Invalid header checksum"); |
bc1f35b9 JH |
459 | h5_reset_rx(h5); |
460 | return 0; | |
461 | } | |
462 | ||
40f10224 | 463 | if (H5_HDR_RELIABLE(hdr) && H5_HDR_SEQ(hdr) != h5->tx_ack) { |
bb0084ec MH |
464 | bt_dev_err(hu->hdev, "Out-of-order packet arrived (%u != %u)", |
465 | H5_HDR_SEQ(hdr), h5->tx_ack); | |
43eb12d7 JH |
466 | h5_reset_rx(h5); |
467 | return 0; | |
468 | } | |
469 | ||
f674a057 JH |
470 | if (h5->state != H5_ACTIVE && |
471 | H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) { | |
bb0084ec | 472 | bt_dev_err(hu->hdev, "Non-link packet received in non-active state"); |
f674a057 | 473 | h5_reset_rx(h5); |
48439d50 | 474 | return 0; |
f674a057 JH |
475 | } |
476 | ||
bc1f35b9 | 477 | h5->rx_func = h5_rx_payload; |
43eb12d7 | 478 | h5->rx_pending = H5_HDR_LEN(hdr); |
bc1f35b9 JH |
479 | |
480 | return 0; | |
481 | } | |
482 | ||
483 | static int h5_rx_pkt_start(struct hci_uart *hu, unsigned char c) | |
484 | { | |
485 | struct h5 *h5 = hu->priv; | |
486 | ||
bc1f35b9 JH |
487 | if (c == SLIP_DELIMITER) |
488 | return 1; | |
489 | ||
490 | h5->rx_func = h5_rx_3wire_hdr; | |
491 | h5->rx_pending = 4; | |
492 | ||
493 | h5->rx_skb = bt_skb_alloc(H5_MAX_LEN, GFP_ATOMIC); | |
494 | if (!h5->rx_skb) { | |
bb0084ec | 495 | bt_dev_err(hu->hdev, "Can't allocate mem for new packet"); |
bc1f35b9 JH |
496 | h5_reset_rx(h5); |
497 | return -ENOMEM; | |
498 | } | |
499 | ||
4a2fa2b8 | 500 | h5->rx_skb->dev = (void *)hu->hdev; |
bc1f35b9 JH |
501 | |
502 | return 0; | |
503 | } | |
504 | ||
505 | static int h5_rx_delimiter(struct hci_uart *hu, unsigned char c) | |
506 | { | |
507 | struct h5 *h5 = hu->priv; | |
508 | ||
bc1f35b9 JH |
509 | if (c == SLIP_DELIMITER) |
510 | h5->rx_func = h5_rx_pkt_start; | |
511 | ||
512 | return 1; | |
513 | } | |
514 | ||
515 | static void h5_unslip_one_byte(struct h5 *h5, unsigned char c) | |
516 | { | |
517 | const u8 delim = SLIP_DELIMITER, esc = SLIP_ESC; | |
518 | const u8 *byte = &c; | |
519 | ||
e0482103 JH |
520 | if (!test_bit(H5_RX_ESC, &h5->flags) && c == SLIP_ESC) { |
521 | set_bit(H5_RX_ESC, &h5->flags); | |
bc1f35b9 JH |
522 | return; |
523 | } | |
524 | ||
e0482103 | 525 | if (test_and_clear_bit(H5_RX_ESC, &h5->flags)) { |
bc1f35b9 JH |
526 | switch (c) { |
527 | case SLIP_ESC_DELIM: | |
528 | byte = &delim; | |
529 | break; | |
530 | case SLIP_ESC_ESC: | |
531 | byte = &esc; | |
532 | break; | |
533 | default: | |
534 | BT_ERR("Invalid esc byte 0x%02hhx", c); | |
535 | h5_reset_rx(h5); | |
536 | return; | |
537 | } | |
bc1f35b9 JH |
538 | } |
539 | ||
59ae1d12 | 540 | skb_put_data(h5->rx_skb, byte, 1); |
bc1f35b9 JH |
541 | h5->rx_pending--; |
542 | ||
98df7446 | 543 | BT_DBG("unslipped 0x%02hhx, rx_pending %zu", *byte, h5->rx_pending); |
bc1f35b9 JH |
544 | } |
545 | ||
546 | static void h5_reset_rx(struct h5 *h5) | |
547 | { | |
548 | if (h5->rx_skb) { | |
549 | kfree_skb(h5->rx_skb); | |
550 | h5->rx_skb = NULL; | |
551 | } | |
552 | ||
553 | h5->rx_func = h5_rx_delimiter; | |
554 | h5->rx_pending = 0; | |
e0482103 | 555 | clear_bit(H5_RX_ESC, &h5->flags); |
bc1f35b9 JH |
556 | } |
557 | ||
9d1c40eb | 558 | static int h5_recv(struct hci_uart *hu, const void *data, int count) |
7dec65c8 | 559 | { |
bc1f35b9 | 560 | struct h5 *h5 = hu->priv; |
9d1c40eb | 561 | const unsigned char *ptr = data; |
bc1f35b9 | 562 | |
255a68e0 JH |
563 | BT_DBG("%s pending %zu count %d", hu->hdev->name, h5->rx_pending, |
564 | count); | |
bc1f35b9 JH |
565 | |
566 | while (count > 0) { | |
567 | int processed; | |
568 | ||
569 | if (h5->rx_pending > 0) { | |
570 | if (*ptr == SLIP_DELIMITER) { | |
bb0084ec | 571 | bt_dev_err(hu->hdev, "Too short H5 packet"); |
bc1f35b9 JH |
572 | h5_reset_rx(h5); |
573 | continue; | |
574 | } | |
575 | ||
576 | h5_unslip_one_byte(h5, *ptr); | |
577 | ||
578 | ptr++; count--; | |
579 | continue; | |
580 | } | |
581 | ||
582 | processed = h5->rx_func(hu, *ptr); | |
583 | if (processed < 0) | |
584 | return processed; | |
585 | ||
586 | ptr += processed; | |
587 | count -= processed; | |
588 | } | |
589 | ||
2fc7acb6 PS |
590 | if (hu->serdev) { |
591 | pm_runtime_get(&hu->serdev->dev); | |
592 | pm_runtime_mark_last_busy(&hu->serdev->dev); | |
593 | pm_runtime_put_autosuspend(&hu->serdev->dev); | |
594 | } | |
d9dd833c | 595 | |
bc1f35b9 | 596 | return 0; |
7dec65c8 JH |
597 | } |
598 | ||
599 | static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb) | |
600 | { | |
7d664fba JH |
601 | struct h5 *h5 = hu->priv; |
602 | ||
603 | if (skb->len > 0xfff) { | |
bb0084ec | 604 | bt_dev_err(hu->hdev, "Packet too long (%u bytes)", skb->len); |
7d664fba JH |
605 | kfree_skb(skb); |
606 | return 0; | |
607 | } | |
608 | ||
f674a057 | 609 | if (h5->state != H5_ACTIVE) { |
bb0084ec | 610 | bt_dev_err(hu->hdev, "Ignoring HCI data in non-active state"); |
f674a057 JH |
611 | kfree_skb(skb); |
612 | return 0; | |
613 | } | |
614 | ||
618e8bc2 | 615 | switch (hci_skb_pkt_type(skb)) { |
7d664fba JH |
616 | case HCI_ACLDATA_PKT: |
617 | case HCI_COMMAND_PKT: | |
618 | skb_queue_tail(&h5->rel, skb); | |
619 | break; | |
620 | ||
621 | case HCI_SCODATA_PKT: | |
1cc3c10c | 622 | case HCI_ISODATA_PKT: |
7d664fba JH |
623 | skb_queue_tail(&h5->unrel, skb); |
624 | break; | |
625 | ||
626 | default: | |
bb0084ec | 627 | bt_dev_err(hu->hdev, "Unknown packet type %u", hci_skb_pkt_type(skb)); |
7d664fba JH |
628 | kfree_skb(skb); |
629 | break; | |
630 | } | |
631 | ||
32cb08e9 PS |
632 | if (hu->serdev) { |
633 | pm_runtime_get_sync(&hu->serdev->dev); | |
634 | pm_runtime_mark_last_busy(&hu->serdev->dev); | |
635 | pm_runtime_put_autosuspend(&hu->serdev->dev); | |
636 | } | |
d9dd833c | 637 | |
7d664fba JH |
638 | return 0; |
639 | } | |
640 | ||
c0a1b73c JH |
641 | static void h5_slip_delim(struct sk_buff *skb) |
642 | { | |
643 | const char delim = SLIP_DELIMITER; | |
644 | ||
59ae1d12 | 645 | skb_put_data(skb, &delim, 1); |
c0a1b73c JH |
646 | } |
647 | ||
648 | static void h5_slip_one_byte(struct sk_buff *skb, u8 c) | |
649 | { | |
650 | const char esc_delim[2] = { SLIP_ESC, SLIP_ESC_DELIM }; | |
651 | const char esc_esc[2] = { SLIP_ESC, SLIP_ESC_ESC }; | |
652 | ||
653 | switch (c) { | |
654 | case SLIP_DELIMITER: | |
59ae1d12 | 655 | skb_put_data(skb, &esc_delim, 2); |
c0a1b73c JH |
656 | break; |
657 | case SLIP_ESC: | |
59ae1d12 | 658 | skb_put_data(skb, &esc_esc, 2); |
c0a1b73c JH |
659 | break; |
660 | default: | |
59ae1d12 | 661 | skb_put_data(skb, &c, 1); |
c0a1b73c JH |
662 | } |
663 | } | |
664 | ||
c826ed09 JH |
665 | static bool valid_packet_type(u8 type) |
666 | { | |
667 | switch (type) { | |
668 | case HCI_ACLDATA_PKT: | |
669 | case HCI_COMMAND_PKT: | |
670 | case HCI_SCODATA_PKT: | |
1cc3c10c | 671 | case HCI_ISODATA_PKT: |
c826ed09 JH |
672 | case HCI_3WIRE_LINK_PKT: |
673 | case HCI_3WIRE_ACK_PKT: | |
674 | return true; | |
675 | default: | |
676 | return false; | |
677 | } | |
678 | } | |
679 | ||
680 | static struct sk_buff *h5_prepare_pkt(struct hci_uart *hu, u8 pkt_type, | |
681 | const u8 *data, size_t len) | |
7d664fba | 682 | { |
40f10224 | 683 | struct h5 *h5 = hu->priv; |
c0a1b73c JH |
684 | struct sk_buff *nskb; |
685 | u8 hdr[4]; | |
686 | int i; | |
687 | ||
c826ed09 | 688 | if (!valid_packet_type(pkt_type)) { |
bb0084ec | 689 | bt_dev_err(hu->hdev, "Unknown packet type %u", pkt_type); |
c826ed09 JH |
690 | return NULL; |
691 | } | |
692 | ||
c0a1b73c JH |
693 | /* |
694 | * Max len of packet: (original len + 4 (H5 hdr) + 2 (crc)) * 2 | |
695 | * (because bytes 0xc0 and 0xdb are escaped, worst case is when | |
696 | * the packet is all made of 0xc0 and 0xdb) + 2 (0xc0 | |
697 | * delimiters at start and end). | |
698 | */ | |
699 | nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC); | |
700 | if (!nskb) | |
701 | return NULL; | |
702 | ||
618e8bc2 | 703 | hci_skb_pkt_type(nskb) = pkt_type; |
c0a1b73c JH |
704 | |
705 | h5_slip_delim(nskb); | |
706 | ||
40f10224 | 707 | hdr[0] = h5->tx_ack << 3; |
e0482103 | 708 | clear_bit(H5_TX_ACK_REQ, &h5->flags); |
c0a1b73c | 709 | |
c826ed09 JH |
710 | /* Reliable packet? */ |
711 | if (pkt_type == HCI_ACLDATA_PKT || pkt_type == HCI_COMMAND_PKT) { | |
c0a1b73c | 712 | hdr[0] |= 1 << 7; |
43eb12d7 JH |
713 | hdr[0] |= h5->tx_seq; |
714 | h5->tx_seq = (h5->tx_seq + 1) % 8; | |
c0a1b73c JH |
715 | } |
716 | ||
717 | hdr[1] = pkt_type | ((len & 0x0f) << 4); | |
718 | hdr[2] = len >> 4; | |
719 | hdr[3] = ~((hdr[0] + hdr[1] + hdr[2]) & 0xff); | |
720 | ||
40f10224 JH |
721 | BT_DBG("%s tx: seq %u ack %u crc %u rel %u type %u len %u", |
722 | hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr), | |
723 | H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr), | |
724 | H5_HDR_LEN(hdr)); | |
725 | ||
c0a1b73c JH |
726 | for (i = 0; i < 4; i++) |
727 | h5_slip_one_byte(nskb, hdr[i]); | |
728 | ||
729 | for (i = 0; i < len; i++) | |
730 | h5_slip_one_byte(nskb, data[i]); | |
731 | ||
732 | h5_slip_delim(nskb); | |
733 | ||
734 | return nskb; | |
735 | } | |
736 | ||
7dec65c8 JH |
737 | static struct sk_buff *h5_dequeue(struct hci_uart *hu) |
738 | { | |
7d664fba | 739 | struct h5 *h5 = hu->priv; |
3f27e95b | 740 | unsigned long flags; |
7d664fba JH |
741 | struct sk_buff *skb, *nskb; |
742 | ||
95c5c220 JH |
743 | if (h5->sleep != H5_AWAKE) { |
744 | const unsigned char wakeup_req[] = { 0x05, 0xfa }; | |
745 | ||
746 | if (h5->sleep == H5_WAKING_UP) | |
747 | return NULL; | |
748 | ||
749 | h5->sleep = H5_WAKING_UP; | |
750 | BT_DBG("Sending wakeup request"); | |
751 | ||
752 | mod_timer(&h5->timer, jiffies + HZ / 100); | |
753 | return h5_prepare_pkt(hu, HCI_3WIRE_LINK_PKT, wakeup_req, 2); | |
754 | } | |
755 | ||
a08b15e6 | 756 | skb = skb_dequeue(&h5->unrel); |
4a2fa2b8 | 757 | if (skb) { |
618e8bc2 | 758 | nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb), |
c0a1b73c | 759 | skb->data, skb->len); |
7d664fba JH |
760 | if (nskb) { |
761 | kfree_skb(skb); | |
762 | return nskb; | |
763 | } | |
764 | ||
765 | skb_queue_head(&h5->unrel, skb); | |
bb0084ec | 766 | bt_dev_err(hu->hdev, "Could not dequeue pkt because alloc_skb failed"); |
7d664fba JH |
767 | } |
768 | ||
3f27e95b JH |
769 | spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING); |
770 | ||
afdc944c | 771 | if (h5->unack.qlen >= h5->tx_win) |
3f27e95b JH |
772 | goto unlock; |
773 | ||
a08b15e6 | 774 | skb = skb_dequeue(&h5->rel); |
4a2fa2b8 | 775 | if (skb) { |
618e8bc2 | 776 | nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb), |
c0a1b73c | 777 | skb->data, skb->len); |
3f27e95b JH |
778 | if (nskb) { |
779 | __skb_queue_tail(&h5->unack, skb); | |
780 | mod_timer(&h5->timer, jiffies + H5_ACK_TIMEOUT); | |
781 | spin_unlock_irqrestore(&h5->unack.lock, flags); | |
782 | return nskb; | |
783 | } | |
784 | ||
785 | skb_queue_head(&h5->rel, skb); | |
bb0084ec | 786 | bt_dev_err(hu->hdev, "Could not dequeue pkt because alloc_skb failed"); |
3f27e95b JH |
787 | } |
788 | ||
789 | unlock: | |
790 | spin_unlock_irqrestore(&h5->unack.lock, flags); | |
791 | ||
e0482103 | 792 | if (test_bit(H5_TX_ACK_REQ, &h5->flags)) |
40f10224 | 793 | return h5_prepare_pkt(hu, HCI_3WIRE_ACK_PKT, NULL, 0); |
7d664fba | 794 | |
7dec65c8 JH |
795 | return NULL; |
796 | } | |
797 | ||
798 | static int h5_flush(struct hci_uart *hu) | |
799 | { | |
7d664fba JH |
800 | BT_DBG("hu %p", hu); |
801 | return 0; | |
7dec65c8 JH |
802 | } |
803 | ||
4ee7ef19 | 804 | static const struct hci_uart_proto h5p = { |
7dec65c8 | 805 | .id = HCI_UART_3WIRE, |
7c40fb8d | 806 | .name = "Three-wire (H5)", |
7dec65c8 JH |
807 | .open = h5_open, |
808 | .close = h5_close, | |
4eb3cbc4 | 809 | .setup = h5_setup, |
7dec65c8 JH |
810 | .recv = h5_recv, |
811 | .enqueue = h5_enqueue, | |
812 | .dequeue = h5_dequeue, | |
813 | .flush = h5_flush, | |
814 | }; | |
815 | ||
ce945552 HG |
816 | static int h5_serdev_probe(struct serdev_device *serdev) |
817 | { | |
818 | struct device *dev = &serdev->dev; | |
819 | struct h5 *h5; | |
66f077dd | 820 | const struct h5_device_data *data; |
ce945552 HG |
821 | |
822 | h5 = devm_kzalloc(dev, sizeof(*h5), GFP_KERNEL); | |
823 | if (!h5) | |
824 | return -ENOMEM; | |
825 | ||
ce945552 HG |
826 | h5->hu = &h5->serdev_hu; |
827 | h5->serdev_hu.serdev = serdev; | |
828 | serdev_device_set_drvdata(serdev, h5); | |
829 | ||
4eb3cbc4 | 830 | if (has_acpi_companion(dev)) { |
0830c0a4 MH |
831 | const struct acpi_device_id *match; |
832 | ||
4eb3cbc4 JC |
833 | match = acpi_match_device(dev->driver->acpi_match_table, dev); |
834 | if (!match) | |
835 | return -ENODEV; | |
836 | ||
66f077dd AP |
837 | data = (const struct h5_device_data *)match->driver_data; |
838 | h5->vnd = data->vnd; | |
4eb3cbc4 | 839 | h5->id = (char *)match->id; |
4c791489 HG |
840 | |
841 | if (h5->vnd->acpi_gpio_map) | |
842 | devm_acpi_dev_add_driver_gpios(dev, | |
843 | h5->vnd->acpi_gpio_map); | |
848fc616 | 844 | } else { |
848fc616 MC |
845 | data = of_device_get_match_data(dev); |
846 | if (!data) | |
847 | return -ENODEV; | |
848 | ||
66f077dd | 849 | h5->vnd = data->vnd; |
4eb3cbc4 JC |
850 | } |
851 | ||
9a9023f3 HG |
852 | if (data->driver_info & H5_INFO_WAKEUP_DISABLE) |
853 | set_bit(H5_WAKEUP_DISABLE, &h5->flags); | |
848fc616 | 854 | |
4c791489 HG |
855 | h5->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW); |
856 | if (IS_ERR(h5->enable_gpio)) | |
857 | return PTR_ERR(h5->enable_gpio); | |
858 | ||
859 | h5->device_wake_gpio = devm_gpiod_get_optional(dev, "device-wake", | |
860 | GPIOD_OUT_LOW); | |
861 | if (IS_ERR(h5->device_wake_gpio)) | |
862 | return PTR_ERR(h5->device_wake_gpio); | |
863 | ||
6fc16533 | 864 | return hci_uart_register_device(&h5->serdev_hu, &h5p); |
ce945552 HG |
865 | } |
866 | ||
867 | static void h5_serdev_remove(struct serdev_device *serdev) | |
868 | { | |
869 | struct h5 *h5 = serdev_device_get_drvdata(serdev); | |
870 | ||
871 | hci_uart_unregister_device(&h5->serdev_hu); | |
872 | } | |
873 | ||
28a75e4c HG |
874 | static int __maybe_unused h5_serdev_suspend(struct device *dev) |
875 | { | |
876 | struct h5 *h5 = dev_get_drvdata(dev); | |
877 | int ret = 0; | |
878 | ||
879 | if (h5->vnd && h5->vnd->suspend) | |
880 | ret = h5->vnd->suspend(h5); | |
881 | ||
882 | return ret; | |
883 | } | |
884 | ||
885 | static int __maybe_unused h5_serdev_resume(struct device *dev) | |
886 | { | |
887 | struct h5 *h5 = dev_get_drvdata(dev); | |
888 | int ret = 0; | |
889 | ||
890 | if (h5->vnd && h5->vnd->resume) | |
891 | ret = h5->vnd->resume(h5); | |
892 | ||
893 | return ret; | |
894 | } | |
895 | ||
b9763cdf | 896 | #ifdef CONFIG_BT_HCIUART_RTL |
b825d7c4 JC |
897 | static int h5_btrtl_setup(struct h5 *h5) |
898 | { | |
899 | struct btrtl_device_info *btrtl_dev; | |
900 | struct sk_buff *skb; | |
901 | __le32 baudrate_data; | |
902 | u32 device_baudrate; | |
903 | unsigned int controller_baudrate; | |
904 | bool flow_control; | |
905 | int err; | |
906 | ||
907 | btrtl_dev = btrtl_initialize(h5->hu->hdev, h5->id); | |
908 | if (IS_ERR(btrtl_dev)) | |
909 | return PTR_ERR(btrtl_dev); | |
910 | ||
911 | err = btrtl_get_uart_settings(h5->hu->hdev, btrtl_dev, | |
912 | &controller_baudrate, &device_baudrate, | |
913 | &flow_control); | |
914 | if (err) | |
915 | goto out_free; | |
916 | ||
917 | baudrate_data = cpu_to_le32(device_baudrate); | |
918 | skb = __hci_cmd_sync(h5->hu->hdev, 0xfc17, sizeof(baudrate_data), | |
919 | &baudrate_data, HCI_INIT_TIMEOUT); | |
920 | if (IS_ERR(skb)) { | |
921 | rtl_dev_err(h5->hu->hdev, "set baud rate command failed\n"); | |
922 | err = PTR_ERR(skb); | |
923 | goto out_free; | |
924 | } else { | |
925 | kfree_skb(skb); | |
926 | } | |
927 | /* Give the device some time to set up the new baudrate. */ | |
928 | usleep_range(10000, 20000); | |
929 | ||
930 | serdev_device_set_baudrate(h5->hu->serdev, controller_baudrate); | |
931 | serdev_device_set_flow_control(h5->hu->serdev, flow_control); | |
932 | ||
30f11dda AP |
933 | if (flow_control) |
934 | set_bit(H5_HW_FLOW_CONTROL, &h5->flags); | |
935 | ||
b825d7c4 JC |
936 | err = btrtl_download_firmware(h5->hu->hdev, btrtl_dev); |
937 | /* Give the device some time before the hci-core sends it a reset */ | |
938 | usleep_range(10000, 20000); | |
939 | ||
3011faa2 | 940 | btrtl_set_quirks(h5->hu->hdev, btrtl_dev); |
7f9f2c3f | 941 | |
b825d7c4 JC |
942 | out_free: |
943 | btrtl_free(btrtl_dev); | |
944 | ||
945 | return err; | |
946 | } | |
947 | ||
948 | static void h5_btrtl_open(struct h5 *h5) | |
949 | { | |
b4a46996 HG |
950 | /* |
951 | * Since h5_btrtl_resume() does a device_reprobe() the suspend handling | |
952 | * done by the hci_suspend_notifier is not necessary; it actually causes | |
953 | * delays and a bunch of errors to get logged, so disable it. | |
954 | */ | |
66f077dd AP |
955 | if (test_bit(H5_WAKEUP_DISABLE, &h5->flags)) |
956 | set_bit(HCI_UART_NO_SUSPEND_NOTIFIER, &h5->hu->flags); | |
b4a46996 | 957 | |
b825d7c4 JC |
958 | /* Devices always start with these fixed parameters */ |
959 | serdev_device_set_flow_control(h5->hu->serdev, false); | |
960 | serdev_device_set_parity(h5->hu->serdev, SERDEV_PARITY_EVEN); | |
961 | serdev_device_set_baudrate(h5->hu->serdev, 115200); | |
4c791489 | 962 | |
9a9023f3 HG |
963 | if (!test_bit(H5_WAKEUP_DISABLE, &h5->flags)) { |
964 | pm_runtime_set_active(&h5->hu->serdev->dev); | |
965 | pm_runtime_use_autosuspend(&h5->hu->serdev->dev); | |
966 | pm_runtime_set_autosuspend_delay(&h5->hu->serdev->dev, | |
967 | SUSPEND_TIMEOUT_MS); | |
968 | pm_runtime_enable(&h5->hu->serdev->dev); | |
969 | } | |
d9dd833c | 970 | |
adce573b VB |
971 | /* The controller needs reset to startup */ |
972 | gpiod_set_value_cansleep(h5->enable_gpio, 0); | |
973 | gpiod_set_value_cansleep(h5->device_wake_gpio, 0); | |
974 | msleep(100); | |
975 | ||
4c791489 HG |
976 | /* The controller needs up to 500ms to wakeup */ |
977 | gpiod_set_value_cansleep(h5->enable_gpio, 1); | |
978 | gpiod_set_value_cansleep(h5->device_wake_gpio, 1); | |
979 | msleep(500); | |
b825d7c4 JC |
980 | } |
981 | ||
4c791489 HG |
982 | static void h5_btrtl_close(struct h5 *h5) |
983 | { | |
9a9023f3 HG |
984 | if (!test_bit(H5_WAKEUP_DISABLE, &h5->flags)) |
985 | pm_runtime_disable(&h5->hu->serdev->dev); | |
d9dd833c | 986 | |
4c791489 HG |
987 | gpiod_set_value_cansleep(h5->device_wake_gpio, 0); |
988 | gpiod_set_value_cansleep(h5->enable_gpio, 0); | |
989 | } | |
990 | ||
8589086f HG |
991 | /* Suspend/resume support. On many devices the RTL BT device loses power during |
992 | * suspend/resume, causing it to lose its firmware and all state. So we simply | |
66f077dd AP |
993 | * turn it off on suspend and reprobe on resume. This mirrors how RTL devices |
994 | * are handled in the USB driver, where the BTUSB_WAKEUP_DISABLE is used which | |
8589086f HG |
995 | * also causes a reprobe on resume. |
996 | */ | |
997 | static int h5_btrtl_suspend(struct h5 *h5) | |
998 | { | |
999 | serdev_device_set_flow_control(h5->hu->serdev, false); | |
1000 | gpiod_set_value_cansleep(h5->device_wake_gpio, 0); | |
66f077dd AP |
1001 | |
1002 | if (test_bit(H5_WAKEUP_DISABLE, &h5->flags)) | |
1003 | gpiod_set_value_cansleep(h5->enable_gpio, 0); | |
1004 | ||
8589086f HG |
1005 | return 0; |
1006 | } | |
1007 | ||
1008 | struct h5_btrtl_reprobe { | |
1009 | struct device *dev; | |
1010 | struct work_struct work; | |
1011 | }; | |
1012 | ||
1013 | static void h5_btrtl_reprobe_worker(struct work_struct *work) | |
1014 | { | |
1015 | struct h5_btrtl_reprobe *reprobe = | |
1016 | container_of(work, struct h5_btrtl_reprobe, work); | |
1017 | int ret; | |
1018 | ||
1019 | ret = device_reprobe(reprobe->dev); | |
1020 | if (ret && ret != -EPROBE_DEFER) | |
1021 | dev_err(reprobe->dev, "Reprobe error %d\n", ret); | |
1022 | ||
1023 | put_device(reprobe->dev); | |
1024 | kfree(reprobe); | |
1025 | module_put(THIS_MODULE); | |
1026 | } | |
1027 | ||
1028 | static int h5_btrtl_resume(struct h5 *h5) | |
1029 | { | |
66f077dd AP |
1030 | if (test_bit(H5_WAKEUP_DISABLE, &h5->flags)) { |
1031 | struct h5_btrtl_reprobe *reprobe; | |
8589086f | 1032 | |
66f077dd AP |
1033 | reprobe = kzalloc(sizeof(*reprobe), GFP_KERNEL); |
1034 | if (!reprobe) | |
1035 | return -ENOMEM; | |
8589086f | 1036 | |
66f077dd | 1037 | __module_get(THIS_MODULE); |
8589086f | 1038 | |
66f077dd AP |
1039 | INIT_WORK(&reprobe->work, h5_btrtl_reprobe_worker); |
1040 | reprobe->dev = get_device(&h5->hu->serdev->dev); | |
1041 | queue_work(system_long_wq, &reprobe->work); | |
1042 | } else { | |
1043 | gpiod_set_value_cansleep(h5->device_wake_gpio, 1); | |
30f11dda AP |
1044 | |
1045 | if (test_bit(H5_HW_FLOW_CONTROL, &h5->flags)) | |
1046 | serdev_device_set_flow_control(h5->hu->serdev, true); | |
66f077dd | 1047 | } |
30f11dda | 1048 | |
8589086f HG |
1049 | return 0; |
1050 | } | |
1051 | ||
4c791489 HG |
1052 | static const struct acpi_gpio_params btrtl_device_wake_gpios = { 0, 0, false }; |
1053 | static const struct acpi_gpio_params btrtl_enable_gpios = { 1, 0, false }; | |
1054 | static const struct acpi_gpio_params btrtl_host_wake_gpios = { 2, 0, false }; | |
1055 | static const struct acpi_gpio_mapping acpi_btrtl_gpios[] = { | |
1056 | { "device-wake-gpios", &btrtl_device_wake_gpios, 1 }, | |
1057 | { "enable-gpios", &btrtl_enable_gpios, 1 }, | |
1058 | { "host-wake-gpios", &btrtl_host_wake_gpios, 1 }, | |
1059 | {}, | |
1060 | }; | |
1061 | ||
b825d7c4 JC |
1062 | static struct h5_vnd rtl_vnd = { |
1063 | .setup = h5_btrtl_setup, | |
1064 | .open = h5_btrtl_open, | |
4c791489 | 1065 | .close = h5_btrtl_close, |
8589086f HG |
1066 | .suspend = h5_btrtl_suspend, |
1067 | .resume = h5_btrtl_resume, | |
4c791489 | 1068 | .acpi_gpio_map = acpi_btrtl_gpios, |
b825d7c4 | 1069 | }; |
66f077dd AP |
1070 | |
1071 | static const struct h5_device_data h5_data_rtl8822cs = { | |
1072 | .vnd = &rtl_vnd, | |
1073 | }; | |
1074 | ||
1075 | static const struct h5_device_data h5_data_rtl8723bs = { | |
1076 | .driver_info = H5_INFO_WAKEUP_DISABLE, | |
1077 | .vnd = &rtl_vnd, | |
1078 | }; | |
b9763cdf | 1079 | #endif |
b825d7c4 JC |
1080 | |
1081 | #ifdef CONFIG_ACPI | |
1082 | static const struct acpi_device_id h5_acpi_match[] = { | |
b9763cdf | 1083 | #ifdef CONFIG_BT_HCIUART_RTL |
66f077dd AP |
1084 | { "OBDA0623", (kernel_ulong_t)&h5_data_rtl8723bs }, |
1085 | { "OBDA8723", (kernel_ulong_t)&h5_data_rtl8723bs }, | |
b9763cdf | 1086 | #endif |
b825d7c4 JC |
1087 | { }, |
1088 | }; | |
1089 | MODULE_DEVICE_TABLE(acpi, h5_acpi_match); | |
1090 | #endif | |
1091 | ||
28a75e4c HG |
1092 | static const struct dev_pm_ops h5_serdev_pm_ops = { |
1093 | SET_SYSTEM_SLEEP_PM_OPS(h5_serdev_suspend, h5_serdev_resume) | |
d9dd833c | 1094 | SET_RUNTIME_PM_OPS(h5_serdev_suspend, h5_serdev_resume, NULL) |
28a75e4c HG |
1095 | }; |
1096 | ||
848fc616 MC |
1097 | static const struct of_device_id rtl_bluetooth_of_match[] = { |
1098 | #ifdef CONFIG_BT_HCIUART_RTL | |
1099 | { .compatible = "realtek,rtl8822cs-bt", | |
66f077dd | 1100 | .data = (const void *)&h5_data_rtl8822cs }, |
4765db37 | 1101 | { .compatible = "realtek,rtl8723bs-bt", |
66f077dd | 1102 | .data = (const void *)&h5_data_rtl8723bs }, |
f272f185 | 1103 | { .compatible = "realtek,rtl8723ds-bt", |
66f077dd | 1104 | .data = (const void *)&h5_data_rtl8723bs }, |
848fc616 MC |
1105 | #endif |
1106 | { }, | |
1107 | }; | |
1108 | MODULE_DEVICE_TABLE(of, rtl_bluetooth_of_match); | |
1109 | ||
ce945552 HG |
1110 | static struct serdev_device_driver h5_serdev_driver = { |
1111 | .probe = h5_serdev_probe, | |
1112 | .remove = h5_serdev_remove, | |
1113 | .driver = { | |
1114 | .name = "hci_uart_h5", | |
b825d7c4 | 1115 | .acpi_match_table = ACPI_PTR(h5_acpi_match), |
28a75e4c | 1116 | .pm = &h5_serdev_pm_ops, |
848fc616 | 1117 | .of_match_table = rtl_bluetooth_of_match, |
ce945552 HG |
1118 | }, |
1119 | }; | |
1120 | ||
7dec65c8 JH |
1121 | int __init h5_init(void) |
1122 | { | |
ce945552 | 1123 | serdev_device_driver_register(&h5_serdev_driver); |
01009eec | 1124 | return hci_uart_register_proto(&h5p); |
7dec65c8 JH |
1125 | } |
1126 | ||
1127 | int __exit h5_deinit(void) | |
1128 | { | |
ce945552 | 1129 | serdev_device_driver_unregister(&h5_serdev_driver); |
7dec65c8 JH |
1130 | return hci_uart_unregister_proto(&h5p); |
1131 | } |