1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Bluetooth HCI UART H4 driver with Nokia Extensions AKA Nokia H4+ |
4 | * |
5 | * Copyright (C) 2015 Marcel Holtmann <marcel@holtmann.org> |
6 | * Copyright (C) 2015-2017 Sebastian Reichel <sre@kernel.org> |
7 | */ |
8 | |
9 | #include <linux/clk.h> |
10 | #include <linux/errno.h> |
11 | #include <linux/firmware.h> |
12 | #include <linux/gpio/consumer.h> |
13 | #include <linux/interrupt.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> |
16 | #include <linux/of.h> |
17 | #include <linux/pm_runtime.h> |
18 | #include <linux/serdev.h> |
19 | #include <linux/skbuff.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/string.h> |
22 | #include <linux/types.h> |
23 | #include <asm/unaligned.h> |
24 | #include <net/bluetooth/bluetooth.h> |
25 | #include <net/bluetooth/hci_core.h> |
26 | |
27 | #include "hci_uart.h" |
28 | #include "btbcm.h" |
29 | |
30 | #define VERSION "0.1" |
31 | |
32 | #define NOKIA_ID_BCM2048 0x04 |
33 | #define NOKIA_ID_TI1271 0x31 |
34 | |
35 | #define FIRMWARE_BCM2048 "nokia/bcmfw.bin" |
36 | #define FIRMWARE_TI1271 "nokia/ti1273.bin" |
37 | |
38 | #define HCI_NOKIA_NEG_PKT 0x06 |
39 | #define HCI_NOKIA_ALIVE_PKT 0x07 |
40 | #define HCI_NOKIA_RADIO_PKT 0x08 |
41 | |
42 | #define HCI_NOKIA_NEG_HDR_SIZE 1 |
43 | #define HCI_NOKIA_MAX_NEG_SIZE 255 |
44 | #define HCI_NOKIA_ALIVE_HDR_SIZE 1 |
45 | #define HCI_NOKIA_MAX_ALIVE_SIZE 255 |
46 | #define HCI_NOKIA_RADIO_HDR_SIZE 2 |
47 | #define HCI_NOKIA_MAX_RADIO_SIZE 255 |
48 | |
49 | #define NOKIA_PROTO_PKT 0x44 |
50 | #define NOKIA_PROTO_BYTE 0x4c |
51 | |
52 | #define NOKIA_NEG_REQ 0x00 |
53 | #define NOKIA_NEG_ACK 0x20 |
54 | #define NOKIA_NEG_NAK 0x40 |
55 | |
56 | #define H4_TYPE_SIZE 1 |
57 | |
58 | #define NOKIA_RECV_ALIVE \ |
59 | .type = HCI_NOKIA_ALIVE_PKT, \ |
60 | .hlen = HCI_NOKIA_ALIVE_HDR_SIZE, \ |
61 | .loff = 0, \ |
62 | .lsize = 1, \ |
63 | .maxlen = HCI_NOKIA_MAX_ALIVE_SIZE \ |
64 | |
65 | #define NOKIA_RECV_NEG \ |
66 | .type = HCI_NOKIA_NEG_PKT, \ |
67 | .hlen = HCI_NOKIA_NEG_HDR_SIZE, \ |
68 | .loff = 0, \ |
69 | .lsize = 1, \ |
70 | .maxlen = HCI_NOKIA_MAX_NEG_SIZE \ |
71 | |
72 | #define NOKIA_RECV_RADIO \ |
73 | .type = HCI_NOKIA_RADIO_PKT, \ |
74 | .hlen = HCI_NOKIA_RADIO_HDR_SIZE, \ |
75 | .loff = 1, \ |
76 | .lsize = 1, \ |
77 | .maxlen = HCI_NOKIA_MAX_RADIO_SIZE \ |
78 | |
79 | struct hci_nokia_neg_hdr { |
80 | u8 dlen; |
81 | } __packed; |
82 | |
83 | struct hci_nokia_neg_cmd { |
84 | u8 ack; |
85 | u16 baud; |
86 | u16 unused1; |
87 | u8 proto; |
88 | u16 sys_clk; |
89 | u16 unused2; |
90 | } __packed; |
91 | |
92 | #define NOKIA_ALIVE_REQ 0x55 |
93 | #define NOKIA_ALIVE_RESP 0xcc |
94 | |
95 | struct hci_nokia_alive_hdr { |
96 | u8 dlen; |
97 | } __packed; |
98 | |
99 | struct hci_nokia_alive_pkt { |
100 | u8 mid; |
101 | u8 unused; |
102 | } __packed; |
103 | |
104 | struct hci_nokia_neg_evt { |
105 | u8 ack; |
106 | u16 baud; |
107 | u16 unused1; |
108 | u8 proto; |
109 | u16 sys_clk; |
110 | u16 unused2; |
111 | u8 man_id; |
112 | u8 ver_id; |
113 | } __packed; |
114 | |
115 | #define MAX_BAUD_RATE 3692300 |
116 | #define SETUP_BAUD_RATE 921600 |
117 | #define INIT_BAUD_RATE 120000 |
118 | |
119 | struct hci_nokia_radio_hdr { |
120 | u8 evt; |
121 | u8 dlen; |
122 | } __packed; |
123 | |
124 | struct nokia_bt_dev { |
125 | struct hci_uart hu; |
126 | struct serdev_device *serdev; |
127 | |
128 | struct gpio_desc *reset; |
129 | struct gpio_desc *wakeup_host; |
130 | struct gpio_desc *wakeup_bt; |
131 | unsigned long sysclk_speed; |
132 | |
133 | int wake_irq; |
134 | struct sk_buff *rx_skb; |
135 | struct sk_buff_head txq; |
136 | bdaddr_t bdaddr; |
137 | |
138 | int init_error; |
139 | struct completion init_completion; |
140 | |
141 | u8 man_id; |
142 | u8 ver_id; |
143 | |
144 | bool initialized; |
145 | bool tx_enabled; |
146 | bool rx_enabled; |
147 | }; |
148 | |
149 | static int nokia_enqueue(struct hci_uart *hu, struct sk_buff *skb); |
150 | |
151 | static void nokia_flow_control(struct serdev_device *serdev, bool enable) |
152 | { |
153 | if (enable) { |
154 | serdev_device_set_rts(serdev, enable: true); |
155 | serdev_device_set_flow_control(serdev, true); |
156 | } else { |
157 | serdev_device_set_flow_control(serdev, false); |
158 | serdev_device_set_rts(serdev, enable: false); |
159 | } |
160 | } |
161 | |
162 | static irqreturn_t wakeup_handler(int irq, void *data) |
163 | { |
164 | struct nokia_bt_dev *btdev = data; |
165 | struct device *dev = &btdev->serdev->dev; |
166 | int wake_state = gpiod_get_value(desc: btdev->wakeup_host); |
167 | |
168 | if (btdev->rx_enabled == wake_state) |
169 | return IRQ_HANDLED; |
170 | |
171 | if (wake_state) |
172 | pm_runtime_get(dev); |
173 | else |
174 | pm_runtime_put(dev); |
175 | |
176 | btdev->rx_enabled = wake_state; |
177 | |
178 | return IRQ_HANDLED; |
179 | } |
180 | |
181 | static int nokia_reset(struct hci_uart *hu) |
182 | { |
183 | struct nokia_bt_dev *btdev = hu->priv; |
184 | struct device *dev = &btdev->serdev->dev; |
185 | int err; |
186 | |
187 | /* reset routine */ |
188 | gpiod_set_value_cansleep(desc: btdev->reset, value: 1); |
189 | gpiod_set_value_cansleep(desc: btdev->wakeup_bt, value: 1); |
190 | |
191 | msleep(msecs: 100); |
192 | |
193 | /* safety check */ |
194 | err = gpiod_get_value_cansleep(desc: btdev->wakeup_host); |
195 | if (err == 1) { |
196 | dev_err(dev, "reset: host wakeup not low!" ); |
197 | return -EPROTO; |
198 | } |
199 | |
200 | /* flush queue */ |
201 | serdev_device_write_flush(btdev->serdev); |
202 | |
203 | /* init uart */ |
204 | nokia_flow_control(serdev: btdev->serdev, enable: false); |
205 | serdev_device_set_baudrate(btdev->serdev, INIT_BAUD_RATE); |
206 | |
207 | gpiod_set_value_cansleep(desc: btdev->reset, value: 0); |
208 | |
209 | /* wait for cts */ |
210 | err = serdev_device_wait_for_cts(serdev: btdev->serdev, state: true, timeout_ms: 200); |
211 | if (err < 0) { |
212 | dev_err(dev, "CTS not received: %d" , err); |
213 | return err; |
214 | } |
215 | |
216 | nokia_flow_control(serdev: btdev->serdev, enable: true); |
217 | |
218 | return 0; |
219 | } |
220 | |
221 | static int nokia_send_alive_packet(struct hci_uart *hu) |
222 | { |
223 | struct nokia_bt_dev *btdev = hu->priv; |
224 | struct device *dev = &btdev->serdev->dev; |
225 | struct hci_nokia_alive_hdr *hdr; |
226 | struct hci_nokia_alive_pkt *pkt; |
227 | struct sk_buff *skb; |
228 | int len; |
229 | |
230 | init_completion(x: &btdev->init_completion); |
231 | |
232 | len = H4_TYPE_SIZE + sizeof(*hdr) + sizeof(*pkt); |
233 | skb = bt_skb_alloc(len, GFP_KERNEL); |
234 | if (!skb) |
235 | return -ENOMEM; |
236 | |
237 | hci_skb_pkt_type(skb) = HCI_NOKIA_ALIVE_PKT; |
238 | memset(skb->data, 0x00, len); |
239 | |
240 | hdr = skb_put(skb, len: sizeof(*hdr)); |
241 | hdr->dlen = sizeof(*pkt); |
242 | pkt = skb_put(skb, len: sizeof(*pkt)); |
243 | pkt->mid = NOKIA_ALIVE_REQ; |
244 | |
245 | nokia_enqueue(hu, skb); |
246 | hci_uart_tx_wakeup(hu); |
247 | |
248 | dev_dbg(dev, "Alive sent" ); |
249 | |
250 | if (!wait_for_completion_interruptible_timeout(x: &btdev->init_completion, |
251 | timeout: msecs_to_jiffies(m: 1000))) { |
252 | return -ETIMEDOUT; |
253 | } |
254 | |
255 | if (btdev->init_error < 0) |
256 | return btdev->init_error; |
257 | |
258 | return 0; |
259 | } |
260 | |
261 | static int nokia_send_negotiation(struct hci_uart *hu) |
262 | { |
263 | struct nokia_bt_dev *btdev = hu->priv; |
264 | struct device *dev = &btdev->serdev->dev; |
265 | struct hci_nokia_neg_cmd *neg_cmd; |
266 | struct hci_nokia_neg_hdr *neg_hdr; |
267 | struct sk_buff *skb; |
268 | int len, err; |
269 | u16 baud = DIV_ROUND_CLOSEST(btdev->sysclk_speed * 10, SETUP_BAUD_RATE); |
270 | int sysclk = btdev->sysclk_speed / 1000; |
271 | |
272 | len = H4_TYPE_SIZE + sizeof(*neg_hdr) + sizeof(*neg_cmd); |
273 | skb = bt_skb_alloc(len, GFP_KERNEL); |
274 | if (!skb) |
275 | return -ENOMEM; |
276 | |
277 | hci_skb_pkt_type(skb) = HCI_NOKIA_NEG_PKT; |
278 | |
279 | neg_hdr = skb_put(skb, len: sizeof(*neg_hdr)); |
280 | neg_hdr->dlen = sizeof(*neg_cmd); |
281 | |
282 | neg_cmd = skb_put(skb, len: sizeof(*neg_cmd)); |
283 | neg_cmd->ack = NOKIA_NEG_REQ; |
284 | neg_cmd->baud = cpu_to_le16(baud); |
285 | neg_cmd->unused1 = 0x0000; |
286 | neg_cmd->proto = NOKIA_PROTO_BYTE; |
287 | neg_cmd->sys_clk = cpu_to_le16(sysclk); |
288 | neg_cmd->unused2 = 0x0000; |
289 | |
290 | btdev->init_error = 0; |
291 | init_completion(x: &btdev->init_completion); |
292 | |
293 | nokia_enqueue(hu, skb); |
294 | hci_uart_tx_wakeup(hu); |
295 | |
296 | dev_dbg(dev, "Negotiation sent" ); |
297 | |
298 | if (!wait_for_completion_interruptible_timeout(x: &btdev->init_completion, |
299 | timeout: msecs_to_jiffies(m: 10000))) { |
300 | return -ETIMEDOUT; |
301 | } |
302 | |
303 | if (btdev->init_error < 0) |
304 | return btdev->init_error; |
305 | |
306 | /* Change to previously negotiated speed. Flow Control |
307 | * is disabled until bluetooth adapter is ready to avoid |
308 | * broken bytes being received. |
309 | */ |
310 | nokia_flow_control(serdev: btdev->serdev, enable: false); |
311 | serdev_device_set_baudrate(btdev->serdev, SETUP_BAUD_RATE); |
312 | err = serdev_device_wait_for_cts(serdev: btdev->serdev, state: true, timeout_ms: 200); |
313 | if (err < 0) { |
314 | dev_err(dev, "CTS not received: %d" , err); |
315 | return err; |
316 | } |
317 | nokia_flow_control(serdev: btdev->serdev, enable: true); |
318 | |
319 | dev_dbg(dev, "Negotiation successful" ); |
320 | |
321 | return 0; |
322 | } |
323 | |
324 | static int nokia_setup_fw(struct hci_uart *hu) |
325 | { |
326 | struct nokia_bt_dev *btdev = hu->priv; |
327 | struct device *dev = &btdev->serdev->dev; |
328 | const char *fwname; |
329 | const struct firmware *fw; |
330 | const u8 *fw_ptr; |
331 | size_t fw_size; |
332 | int err; |
333 | |
334 | dev_dbg(dev, "setup firmware" ); |
335 | |
336 | if (btdev->man_id == NOKIA_ID_BCM2048) { |
337 | fwname = FIRMWARE_BCM2048; |
338 | } else if (btdev->man_id == NOKIA_ID_TI1271) { |
339 | fwname = FIRMWARE_TI1271; |
340 | } else { |
341 | dev_err(dev, "Unsupported bluetooth device!" ); |
342 | return -ENODEV; |
343 | } |
344 | |
345 | err = request_firmware(fw: &fw, name: fwname, device: dev); |
346 | if (err < 0) { |
347 | dev_err(dev, "%s: Failed to load Nokia firmware file (%d)" , |
348 | hu->hdev->name, err); |
349 | return err; |
350 | } |
351 | |
352 | fw_ptr = fw->data; |
353 | fw_size = fw->size; |
354 | |
355 | while (fw_size >= 4) { |
356 | u16 pkt_size = get_unaligned_le16(p: fw_ptr); |
357 | u8 pkt_type = fw_ptr[2]; |
358 | const struct hci_command_hdr *cmd; |
359 | u16 opcode; |
360 | struct sk_buff *skb; |
361 | |
362 | switch (pkt_type) { |
363 | case HCI_COMMAND_PKT: |
364 | cmd = (struct hci_command_hdr *)(fw_ptr + 3); |
365 | opcode = le16_to_cpu(cmd->opcode); |
366 | |
367 | skb = __hci_cmd_sync(hdev: hu->hdev, opcode, plen: cmd->plen, |
368 | param: fw_ptr + 3 + HCI_COMMAND_HDR_SIZE, |
369 | HCI_INIT_TIMEOUT); |
370 | if (IS_ERR(ptr: skb)) { |
371 | err = PTR_ERR(ptr: skb); |
372 | dev_err(dev, "%s: FW command %04x failed (%d)" , |
373 | hu->hdev->name, opcode, err); |
374 | goto done; |
375 | } |
376 | kfree_skb(skb); |
377 | break; |
378 | case HCI_NOKIA_RADIO_PKT: |
379 | case HCI_NOKIA_NEG_PKT: |
380 | case HCI_NOKIA_ALIVE_PKT: |
381 | break; |
382 | } |
383 | |
384 | fw_ptr += pkt_size + 2; |
385 | fw_size -= pkt_size + 2; |
386 | } |
387 | |
388 | done: |
389 | release_firmware(fw); |
390 | return err; |
391 | } |
392 | |
393 | static int nokia_setup(struct hci_uart *hu) |
394 | { |
395 | struct nokia_bt_dev *btdev = hu->priv; |
396 | struct device *dev = &btdev->serdev->dev; |
397 | int err; |
398 | |
399 | btdev->initialized = false; |
400 | |
401 | nokia_flow_control(serdev: btdev->serdev, enable: false); |
402 | |
403 | pm_runtime_get_sync(dev); |
404 | |
405 | if (btdev->tx_enabled) { |
406 | gpiod_set_value_cansleep(desc: btdev->wakeup_bt, value: 0); |
407 | pm_runtime_put(dev: &btdev->serdev->dev); |
408 | btdev->tx_enabled = false; |
409 | } |
410 | |
411 | dev_dbg(dev, "protocol setup" ); |
412 | |
413 | /* 0. reset connection */ |
414 | err = nokia_reset(hu); |
415 | if (err < 0) { |
416 | dev_err(dev, "Reset failed: %d" , err); |
417 | goto out; |
418 | } |
419 | |
420 | /* 1. negotiate speed etc */ |
421 | err = nokia_send_negotiation(hu); |
422 | if (err < 0) { |
423 | dev_err(dev, "Negotiation failed: %d" , err); |
424 | goto out; |
425 | } |
426 | |
427 | /* 2. verify correct setup using alive packet */ |
428 | err = nokia_send_alive_packet(hu); |
429 | if (err < 0) { |
430 | dev_err(dev, "Alive check failed: %d" , err); |
431 | goto out; |
432 | } |
433 | |
434 | /* 3. send firmware */ |
435 | err = nokia_setup_fw(hu); |
436 | if (err < 0) { |
437 | dev_err(dev, "Could not setup FW: %d" , err); |
438 | goto out; |
439 | } |
440 | |
441 | nokia_flow_control(serdev: btdev->serdev, enable: false); |
442 | serdev_device_set_baudrate(btdev->serdev, MAX_BAUD_RATE); |
443 | nokia_flow_control(serdev: btdev->serdev, enable: true); |
444 | |
445 | if (btdev->man_id == NOKIA_ID_BCM2048) { |
446 | hu->hdev->set_bdaddr = btbcm_set_bdaddr; |
447 | set_bit(nr: HCI_QUIRK_INVALID_BDADDR, addr: &hu->hdev->quirks); |
448 | dev_dbg(dev, "bcm2048 has invalid bluetooth address!" ); |
449 | } |
450 | |
451 | dev_dbg(dev, "protocol setup done!" ); |
452 | |
453 | gpiod_set_value_cansleep(desc: btdev->wakeup_bt, value: 0); |
454 | pm_runtime_put(dev); |
455 | btdev->tx_enabled = false; |
456 | btdev->initialized = true; |
457 | |
458 | return 0; |
459 | out: |
460 | pm_runtime_put(dev); |
461 | |
462 | return err; |
463 | } |
464 | |
465 | static int nokia_open(struct hci_uart *hu) |
466 | { |
467 | struct device *dev = &hu->serdev->dev; |
468 | |
469 | dev_dbg(dev, "protocol open" ); |
470 | |
471 | pm_runtime_enable(dev); |
472 | |
473 | return 0; |
474 | } |
475 | |
476 | static int nokia_flush(struct hci_uart *hu) |
477 | { |
478 | struct nokia_bt_dev *btdev = hu->priv; |
479 | |
480 | dev_dbg(&btdev->serdev->dev, "flush device" ); |
481 | |
482 | skb_queue_purge(list: &btdev->txq); |
483 | |
484 | return 0; |
485 | } |
486 | |
487 | static int nokia_close(struct hci_uart *hu) |
488 | { |
489 | struct nokia_bt_dev *btdev = hu->priv; |
490 | struct device *dev = &btdev->serdev->dev; |
491 | |
492 | dev_dbg(dev, "close device" ); |
493 | |
494 | btdev->initialized = false; |
495 | |
496 | skb_queue_purge(list: &btdev->txq); |
497 | |
498 | kfree_skb(skb: btdev->rx_skb); |
499 | |
500 | /* disable module */ |
501 | gpiod_set_value(desc: btdev->reset, value: 1); |
502 | gpiod_set_value(desc: btdev->wakeup_bt, value: 0); |
503 | |
504 | pm_runtime_disable(dev: &btdev->serdev->dev); |
505 | |
506 | return 0; |
507 | } |
508 | |
509 | /* Enqueue frame for transmittion (padding, crc, etc) */ |
510 | static int nokia_enqueue(struct hci_uart *hu, struct sk_buff *skb) |
511 | { |
512 | struct nokia_bt_dev *btdev = hu->priv; |
513 | int err; |
514 | |
515 | /* Prepend skb with frame type */ |
516 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
517 | |
518 | /* Packets must be word aligned */ |
519 | if (skb->len % 2) { |
520 | err = skb_pad(skb, pad: 1); |
521 | if (err) |
522 | return err; |
523 | skb_put(skb, len: 1); |
524 | } |
525 | |
526 | skb_queue_tail(list: &btdev->txq, newsk: skb); |
527 | |
528 | return 0; |
529 | } |
530 | |
531 | static int nokia_recv_negotiation_packet(struct hci_dev *hdev, |
532 | struct sk_buff *skb) |
533 | { |
534 | struct hci_uart *hu = hci_get_drvdata(hdev); |
535 | struct nokia_bt_dev *btdev = hu->priv; |
536 | struct device *dev = &btdev->serdev->dev; |
537 | struct hci_nokia_neg_hdr *hdr; |
538 | struct hci_nokia_neg_evt *evt; |
539 | int ret = 0; |
540 | |
541 | hdr = (struct hci_nokia_neg_hdr *)skb->data; |
542 | if (hdr->dlen != sizeof(*evt)) { |
543 | btdev->init_error = -EIO; |
544 | ret = -EIO; |
545 | goto finish_neg; |
546 | } |
547 | |
548 | evt = skb_pull(skb, len: sizeof(*hdr)); |
549 | |
550 | if (evt->ack != NOKIA_NEG_ACK) { |
551 | dev_err(dev, "Negotiation received: wrong reply" ); |
552 | btdev->init_error = -EINVAL; |
553 | ret = -EINVAL; |
554 | goto finish_neg; |
555 | } |
556 | |
557 | btdev->man_id = evt->man_id; |
558 | btdev->ver_id = evt->ver_id; |
559 | |
560 | dev_dbg(dev, "Negotiation received: baud=%u:clk=%u:manu=%u:vers=%u" , |
561 | evt->baud, evt->sys_clk, evt->man_id, evt->ver_id); |
562 | |
563 | finish_neg: |
564 | complete(&btdev->init_completion); |
565 | kfree_skb(skb); |
566 | return ret; |
567 | } |
568 | |
569 | static int nokia_recv_alive_packet(struct hci_dev *hdev, struct sk_buff *skb) |
570 | { |
571 | struct hci_uart *hu = hci_get_drvdata(hdev); |
572 | struct nokia_bt_dev *btdev = hu->priv; |
573 | struct device *dev = &btdev->serdev->dev; |
574 | struct hci_nokia_alive_hdr *hdr; |
575 | struct hci_nokia_alive_pkt *pkt; |
576 | int ret = 0; |
577 | |
578 | hdr = (struct hci_nokia_alive_hdr *)skb->data; |
579 | if (hdr->dlen != sizeof(*pkt)) { |
580 | dev_err(dev, "Corrupted alive message" ); |
581 | btdev->init_error = -EIO; |
582 | ret = -EIO; |
583 | goto finish_alive; |
584 | } |
585 | |
586 | pkt = skb_pull(skb, len: sizeof(*hdr)); |
587 | |
588 | if (pkt->mid != NOKIA_ALIVE_RESP) { |
589 | dev_err(dev, "Alive received: invalid response: 0x%02x!" , |
590 | pkt->mid); |
591 | btdev->init_error = -EINVAL; |
592 | ret = -EINVAL; |
593 | goto finish_alive; |
594 | } |
595 | |
596 | dev_dbg(dev, "Alive received" ); |
597 | |
598 | finish_alive: |
599 | complete(&btdev->init_completion); |
600 | kfree_skb(skb); |
601 | return ret; |
602 | } |
603 | |
604 | static int nokia_recv_radio(struct hci_dev *hdev, struct sk_buff *skb) |
605 | { |
606 | /* Packets received on the dedicated radio channel are |
607 | * HCI events and so feed them back into the core. |
608 | */ |
609 | hci_skb_pkt_type(skb) = HCI_EVENT_PKT; |
610 | return hci_recv_frame(hdev, skb); |
611 | } |
612 | |
613 | /* Recv data */ |
614 | static const struct h4_recv_pkt nokia_recv_pkts[] = { |
615 | { H4_RECV_ACL, .recv = hci_recv_frame }, |
616 | { H4_RECV_SCO, .recv = hci_recv_frame }, |
617 | { H4_RECV_EVENT, .recv = hci_recv_frame }, |
618 | { NOKIA_RECV_ALIVE, .recv = nokia_recv_alive_packet }, |
619 | { NOKIA_RECV_NEG, .recv = nokia_recv_negotiation_packet }, |
620 | { NOKIA_RECV_RADIO, .recv = nokia_recv_radio }, |
621 | }; |
622 | |
623 | static int nokia_recv(struct hci_uart *hu, const void *data, int count) |
624 | { |
625 | struct nokia_bt_dev *btdev = hu->priv; |
626 | struct device *dev = &btdev->serdev->dev; |
627 | int err; |
628 | |
629 | if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) |
630 | return -EUNATCH; |
631 | |
632 | btdev->rx_skb = h4_recv_buf(hdev: hu->hdev, skb: btdev->rx_skb, buffer: data, count, |
633 | pkts: nokia_recv_pkts, ARRAY_SIZE(nokia_recv_pkts)); |
634 | if (IS_ERR(ptr: btdev->rx_skb)) { |
635 | err = PTR_ERR(ptr: btdev->rx_skb); |
636 | dev_err(dev, "Frame reassembly failed (%d)" , err); |
637 | btdev->rx_skb = NULL; |
638 | return err; |
639 | } |
640 | |
641 | return count; |
642 | } |
643 | |
644 | static struct sk_buff *nokia_dequeue(struct hci_uart *hu) |
645 | { |
646 | struct nokia_bt_dev *btdev = hu->priv; |
647 | struct device *dev = &btdev->serdev->dev; |
648 | struct sk_buff *result = skb_dequeue(list: &btdev->txq); |
649 | |
650 | if (!btdev->initialized) |
651 | return result; |
652 | |
653 | if (btdev->tx_enabled == !!result) |
654 | return result; |
655 | |
656 | if (result) { |
657 | pm_runtime_get_sync(dev); |
658 | gpiod_set_value_cansleep(desc: btdev->wakeup_bt, value: 1); |
659 | } else { |
660 | serdev_device_wait_until_sent(btdev->serdev, 0); |
661 | gpiod_set_value_cansleep(desc: btdev->wakeup_bt, value: 0); |
662 | pm_runtime_put(dev); |
663 | } |
664 | |
665 | btdev->tx_enabled = !!result; |
666 | |
667 | return result; |
668 | } |
669 | |
670 | static const struct hci_uart_proto nokia_proto = { |
671 | .id = HCI_UART_NOKIA, |
672 | .name = "Nokia" , |
673 | .open = nokia_open, |
674 | .close = nokia_close, |
675 | .recv = nokia_recv, |
676 | .enqueue = nokia_enqueue, |
677 | .dequeue = nokia_dequeue, |
678 | .flush = nokia_flush, |
679 | .setup = nokia_setup, |
680 | .manufacturer = 1, |
681 | }; |
682 | |
683 | static int nokia_bluetooth_serdev_probe(struct serdev_device *serdev) |
684 | { |
685 | struct device *dev = &serdev->dev; |
686 | struct nokia_bt_dev *btdev; |
687 | struct clk *sysclk; |
688 | int err = 0; |
689 | |
690 | btdev = devm_kzalloc(dev, size: sizeof(*btdev), GFP_KERNEL); |
691 | if (!btdev) |
692 | return -ENOMEM; |
693 | |
694 | btdev->hu.serdev = btdev->serdev = serdev; |
695 | serdev_device_set_drvdata(serdev, data: btdev); |
696 | |
697 | btdev->reset = devm_gpiod_get(dev, con_id: "reset" , flags: GPIOD_OUT_HIGH); |
698 | if (IS_ERR(ptr: btdev->reset)) { |
699 | err = PTR_ERR(ptr: btdev->reset); |
700 | dev_err(dev, "could not get reset gpio: %d" , err); |
701 | return err; |
702 | } |
703 | |
704 | btdev->wakeup_host = devm_gpiod_get(dev, con_id: "host-wakeup" , flags: GPIOD_IN); |
705 | if (IS_ERR(ptr: btdev->wakeup_host)) { |
706 | err = PTR_ERR(ptr: btdev->wakeup_host); |
707 | dev_err(dev, "could not get host wakeup gpio: %d" , err); |
708 | return err; |
709 | } |
710 | |
711 | btdev->wake_irq = gpiod_to_irq(desc: btdev->wakeup_host); |
712 | |
713 | err = devm_request_threaded_irq(dev, irq: btdev->wake_irq, NULL, |
714 | thread_fn: wakeup_handler, |
715 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
716 | devname: "wakeup" , dev_id: btdev); |
717 | if (err) { |
718 | dev_err(dev, "could request wakeup irq: %d" , err); |
719 | return err; |
720 | } |
721 | |
722 | btdev->wakeup_bt = devm_gpiod_get(dev, con_id: "bluetooth-wakeup" , |
723 | flags: GPIOD_OUT_LOW); |
724 | if (IS_ERR(ptr: btdev->wakeup_bt)) { |
725 | err = PTR_ERR(ptr: btdev->wakeup_bt); |
726 | dev_err(dev, "could not get BT wakeup gpio: %d" , err); |
727 | return err; |
728 | } |
729 | |
730 | sysclk = devm_clk_get(dev, id: "sysclk" ); |
731 | if (IS_ERR(ptr: sysclk)) { |
732 | err = PTR_ERR(ptr: sysclk); |
733 | dev_err(dev, "could not get sysclk: %d" , err); |
734 | return err; |
735 | } |
736 | |
737 | err = clk_prepare_enable(clk: sysclk); |
738 | if (err) { |
739 | dev_err(dev, "could not enable sysclk: %d" , err); |
740 | return err; |
741 | } |
742 | btdev->sysclk_speed = clk_get_rate(clk: sysclk); |
743 | clk_disable_unprepare(clk: sysclk); |
744 | |
745 | skb_queue_head_init(list: &btdev->txq); |
746 | |
747 | btdev->hu.priv = btdev; |
748 | btdev->hu.alignment = 2; /* Nokia H4+ is word aligned */ |
749 | |
750 | err = hci_uart_register_device(hu: &btdev->hu, p: &nokia_proto); |
751 | if (err) { |
752 | dev_err(dev, "could not register bluetooth uart: %d" , err); |
753 | return err; |
754 | } |
755 | |
756 | return 0; |
757 | } |
758 | |
759 | static void nokia_bluetooth_serdev_remove(struct serdev_device *serdev) |
760 | { |
761 | struct nokia_bt_dev *btdev = serdev_device_get_drvdata(serdev); |
762 | |
763 | hci_uart_unregister_device(hu: &btdev->hu); |
764 | } |
765 | |
766 | static int nokia_bluetooth_runtime_suspend(struct device *dev) |
767 | { |
768 | struct serdev_device *serdev = to_serdev_device(d: dev); |
769 | |
770 | nokia_flow_control(serdev, enable: false); |
771 | return 0; |
772 | } |
773 | |
774 | static int nokia_bluetooth_runtime_resume(struct device *dev) |
775 | { |
776 | struct serdev_device *serdev = to_serdev_device(d: dev); |
777 | |
778 | nokia_flow_control(serdev, enable: true); |
779 | return 0; |
780 | } |
781 | |
782 | static const struct dev_pm_ops nokia_bluetooth_pm_ops = { |
783 | SET_RUNTIME_PM_OPS(nokia_bluetooth_runtime_suspend, |
784 | nokia_bluetooth_runtime_resume, |
785 | NULL) |
786 | }; |
787 | |
788 | #ifdef CONFIG_OF |
789 | static const struct of_device_id nokia_bluetooth_of_match[] = { |
790 | { .compatible = "nokia,h4p-bluetooth" , }, |
791 | {}, |
792 | }; |
793 | MODULE_DEVICE_TABLE(of, nokia_bluetooth_of_match); |
794 | #endif |
795 | |
796 | static struct serdev_device_driver nokia_bluetooth_serdev_driver = { |
797 | .probe = nokia_bluetooth_serdev_probe, |
798 | .remove = nokia_bluetooth_serdev_remove, |
799 | .driver = { |
800 | .name = "nokia-bluetooth" , |
801 | .pm = &nokia_bluetooth_pm_ops, |
802 | .of_match_table = of_match_ptr(nokia_bluetooth_of_match), |
803 | }, |
804 | }; |
805 | |
806 | module_serdev_device_driver(nokia_bluetooth_serdev_driver); |
807 | |
808 | MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>" ); |
809 | MODULE_DESCRIPTION("Bluetooth HCI UART Nokia H4+ driver ver " VERSION); |
810 | MODULE_VERSION(VERSION); |
811 | MODULE_LICENSE("GPL" ); |
812 | |