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82f5169b RH |
1 | /* |
2 | * Bluetooth HCI serdev driver lib | |
3 | * | |
4 | * Copyright (C) 2017 Linaro, Ltd., Rob Herring <robh@kernel.org> | |
5 | * | |
6 | * Based on hci_ldisc.c: | |
7 | * | |
8 | * Copyright (C) 2000-2001 Qualcomm Incorporated | |
9 | * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/serdev.h> | |
27 | #include <linux/skbuff.h> | |
28 | ||
29 | #include <net/bluetooth/bluetooth.h> | |
30 | #include <net/bluetooth/hci_core.h> | |
31 | ||
32 | #include "hci_uart.h" | |
33 | ||
640e32c9 | 34 | static struct serdev_device_ops hci_serdev_client_ops; |
82f5169b RH |
35 | |
36 | static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type) | |
37 | { | |
38 | struct hci_dev *hdev = hu->hdev; | |
39 | ||
40 | /* Update HCI stat counters */ | |
41 | switch (pkt_type) { | |
42 | case HCI_COMMAND_PKT: | |
43 | hdev->stat.cmd_tx++; | |
44 | break; | |
45 | ||
46 | case HCI_ACLDATA_PKT: | |
47 | hdev->stat.acl_tx++; | |
48 | break; | |
49 | ||
50 | case HCI_SCODATA_PKT: | |
51 | hdev->stat.sco_tx++; | |
52 | break; | |
53 | } | |
54 | } | |
55 | ||
56 | static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu) | |
57 | { | |
58 | struct sk_buff *skb = hu->tx_skb; | |
59 | ||
60 | if (!skb) | |
61 | skb = hu->proto->dequeue(hu); | |
62 | else | |
63 | hu->tx_skb = NULL; | |
64 | ||
65 | return skb; | |
66 | } | |
67 | ||
68 | static void hci_uart_write_work(struct work_struct *work) | |
69 | { | |
70 | struct hci_uart *hu = container_of(work, struct hci_uart, write_work); | |
71 | struct serdev_device *serdev = hu->serdev; | |
72 | struct hci_dev *hdev = hu->hdev; | |
73 | struct sk_buff *skb; | |
74 | ||
75 | /* REVISIT: | |
76 | * should we cope with bad skbs or ->write() returning an error value? | |
77 | */ | |
78 | do { | |
79 | clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); | |
80 | ||
81 | while ((skb = hci_uart_dequeue(hu))) { | |
82 | int len; | |
83 | ||
84 | len = serdev_device_write_buf(serdev, | |
85 | skb->data, skb->len); | |
86 | hdev->stat.byte_tx += len; | |
87 | ||
88 | skb_pull(skb, len); | |
89 | if (skb->len) { | |
90 | hu->tx_skb = skb; | |
91 | break; | |
92 | } | |
93 | ||
94 | hci_uart_tx_complete(hu, hci_skb_pkt_type(skb)); | |
95 | kfree_skb(skb); | |
96 | } | |
97 | } while(test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)); | |
98 | ||
99 | clear_bit(HCI_UART_SENDING, &hu->tx_state); | |
100 | } | |
101 | ||
102 | /* ------- Interface to HCI layer ------ */ | |
103 | ||
104 | /* Initialize device */ | |
105 | static int hci_uart_open(struct hci_dev *hdev) | |
106 | { | |
82f5169b RH |
107 | BT_DBG("%s %p", hdev->name, hdev); |
108 | ||
52b318e6 | 109 | return 0; |
82f5169b RH |
110 | } |
111 | ||
112 | /* Reset device */ | |
113 | static int hci_uart_flush(struct hci_dev *hdev) | |
114 | { | |
115 | struct hci_uart *hu = hci_get_drvdata(hdev); | |
116 | ||
117 | BT_DBG("hdev %p serdev %p", hdev, hu->serdev); | |
118 | ||
119 | if (hu->tx_skb) { | |
120 | kfree_skb(hu->tx_skb); hu->tx_skb = NULL; | |
121 | } | |
122 | ||
123 | /* Flush any pending characters in the driver and discipline. */ | |
124 | serdev_device_write_flush(hu->serdev); | |
125 | ||
126 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) | |
127 | hu->proto->flush(hu); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | /* Close device */ | |
133 | static int hci_uart_close(struct hci_dev *hdev) | |
134 | { | |
82f5169b RH |
135 | BT_DBG("hdev %p", hdev); |
136 | ||
137 | hci_uart_flush(hdev); | |
138 | hdev->flush = NULL; | |
139 | ||
82f5169b RH |
140 | return 0; |
141 | } | |
142 | ||
143 | /* Send frames from HCI layer */ | |
144 | static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) | |
145 | { | |
146 | struct hci_uart *hu = hci_get_drvdata(hdev); | |
147 | ||
148 | BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), | |
149 | skb->len); | |
150 | ||
151 | hu->proto->enqueue(hu, skb); | |
152 | ||
153 | hci_uart_tx_wakeup(hu); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | static int hci_uart_setup(struct hci_dev *hdev) | |
159 | { | |
160 | struct hci_uart *hu = hci_get_drvdata(hdev); | |
161 | struct hci_rp_read_local_version *ver; | |
162 | struct sk_buff *skb; | |
163 | unsigned int speed; | |
164 | int err; | |
165 | ||
166 | /* Init speed if any */ | |
167 | if (hu->init_speed) | |
168 | speed = hu->init_speed; | |
169 | else if (hu->proto->init_speed) | |
170 | speed = hu->proto->init_speed; | |
171 | else | |
172 | speed = 0; | |
173 | ||
174 | if (speed) | |
175 | serdev_device_set_baudrate(hu->serdev, speed); | |
176 | ||
177 | /* Operational speed if any */ | |
178 | if (hu->oper_speed) | |
179 | speed = hu->oper_speed; | |
180 | else if (hu->proto->oper_speed) | |
181 | speed = hu->proto->oper_speed; | |
182 | else | |
183 | speed = 0; | |
184 | ||
185 | if (hu->proto->set_baudrate && speed) { | |
186 | err = hu->proto->set_baudrate(hu, speed); | |
187 | if (err) | |
2064ee33 | 188 | bt_dev_err(hdev, "Failed to set baudrate"); |
82f5169b RH |
189 | else |
190 | serdev_device_set_baudrate(hu->serdev, speed); | |
191 | } | |
192 | ||
193 | if (hu->proto->setup) | |
194 | return hu->proto->setup(hu); | |
195 | ||
196 | if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags)) | |
197 | return 0; | |
198 | ||
199 | skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, | |
200 | HCI_INIT_TIMEOUT); | |
201 | if (IS_ERR(skb)) { | |
2064ee33 MH |
202 | bt_dev_err(hdev, "Reading local version info failed (%ld)", |
203 | PTR_ERR(skb)); | |
82f5169b RH |
204 | return 0; |
205 | } | |
206 | ||
207 | if (skb->len != sizeof(*ver)) { | |
2064ee33 | 208 | bt_dev_err(hdev, "Event length mismatch for version info"); |
82f5169b RH |
209 | } |
210 | ||
211 | kfree_skb(skb); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | /** hci_uart_write_wakeup - transmit buffer wakeup | |
216 | * @serdev: serial device | |
217 | * | |
218 | * This function is called by the serdev framework when it accepts | |
219 | * more data being sent. | |
220 | */ | |
221 | static void hci_uart_write_wakeup(struct serdev_device *serdev) | |
222 | { | |
223 | struct hci_uart *hu = serdev_device_get_drvdata(serdev); | |
224 | ||
225 | BT_DBG(""); | |
226 | ||
227 | if (!hu || serdev != hu->serdev) { | |
228 | WARN_ON(1); | |
229 | return; | |
230 | } | |
231 | ||
232 | if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) | |
233 | hci_uart_tx_wakeup(hu); | |
234 | } | |
235 | ||
236 | /** hci_uart_receive_buf - receive buffer wakeup | |
237 | * @serdev: serial device | |
238 | * @data: pointer to received data | |
239 | * @count: count of received data in bytes | |
240 | * | |
241 | * This function is called by the serdev framework when it received data | |
242 | * in the RX buffer. | |
243 | * | |
244 | * Return: number of processed bytes | |
245 | */ | |
246 | static int hci_uart_receive_buf(struct serdev_device *serdev, const u8 *data, | |
247 | size_t count) | |
248 | { | |
249 | struct hci_uart *hu = serdev_device_get_drvdata(serdev); | |
250 | ||
251 | if (!hu || serdev != hu->serdev) { | |
252 | WARN_ON(1); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) | |
257 | return 0; | |
258 | ||
259 | /* It does not need a lock here as it is already protected by a mutex in | |
260 | * tty caller | |
261 | */ | |
262 | hu->proto->recv(hu, data, count); | |
263 | ||
264 | if (hu->hdev) | |
265 | hu->hdev->stat.byte_rx += count; | |
266 | ||
267 | return count; | |
268 | } | |
269 | ||
640e32c9 | 270 | static struct serdev_device_ops hci_serdev_client_ops = { |
82f5169b RH |
271 | .receive_buf = hci_uart_receive_buf, |
272 | .write_wakeup = hci_uart_write_wakeup, | |
273 | }; | |
274 | ||
275 | int hci_uart_register_device(struct hci_uart *hu, | |
276 | const struct hci_uart_proto *p) | |
277 | { | |
278 | int err; | |
279 | struct hci_dev *hdev; | |
280 | ||
281 | BT_DBG(""); | |
282 | ||
52b318e6 SR |
283 | serdev_device_set_client_ops(hu->serdev, &hci_serdev_client_ops); |
284 | ||
82f5169b RH |
285 | err = p->open(hu); |
286 | if (err) | |
287 | return err; | |
288 | ||
289 | hu->proto = p; | |
290 | set_bit(HCI_UART_PROTO_READY, &hu->flags); | |
291 | ||
292 | /* Initialize and register HCI device */ | |
293 | hdev = hci_alloc_dev(); | |
294 | if (!hdev) { | |
295 | BT_ERR("Can't allocate HCI device"); | |
296 | err = -ENOMEM; | |
297 | goto err_alloc; | |
298 | } | |
299 | ||
300 | hu->hdev = hdev; | |
301 | ||
302 | hdev->bus = HCI_UART; | |
303 | hci_set_drvdata(hdev, hu); | |
304 | ||
305 | INIT_WORK(&hu->write_work, hci_uart_write_work); | |
306 | ||
307 | /* Only when vendor specific setup callback is provided, consider | |
308 | * the manufacturer information valid. This avoids filling in the | |
309 | * value for Ericsson when nothing is specified. | |
310 | */ | |
311 | if (hu->proto->setup) | |
312 | hdev->manufacturer = hu->proto->manufacturer; | |
313 | ||
314 | hdev->open = hci_uart_open; | |
315 | hdev->close = hci_uart_close; | |
316 | hdev->flush = hci_uart_flush; | |
317 | hdev->send = hci_uart_send_frame; | |
318 | hdev->setup = hci_uart_setup; | |
319 | SET_HCIDEV_DEV(hdev, &hu->serdev->dev); | |
320 | ||
321 | if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) | |
322 | set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); | |
323 | ||
324 | if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) | |
325 | set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); | |
326 | ||
327 | if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags)) | |
328 | set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); | |
329 | ||
330 | if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags)) | |
331 | hdev->dev_type = HCI_AMP; | |
332 | else | |
333 | hdev->dev_type = HCI_PRIMARY; | |
334 | ||
335 | if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) | |
336 | return 0; | |
337 | ||
338 | if (hci_register_dev(hdev) < 0) { | |
339 | BT_ERR("Can't register HCI device"); | |
340 | err = -ENODEV; | |
341 | goto err_register; | |
342 | } | |
343 | ||
344 | set_bit(HCI_UART_REGISTERED, &hu->flags); | |
345 | ||
346 | return 0; | |
347 | ||
348 | err_register: | |
349 | hci_free_dev(hdev); | |
350 | err_alloc: | |
351 | clear_bit(HCI_UART_PROTO_READY, &hu->flags); | |
352 | p->close(hu); | |
353 | return err; | |
354 | } | |
081f36a8 | 355 | EXPORT_SYMBOL_GPL(hci_uart_register_device); |
c34dc3bf IM |
356 | |
357 | void hci_uart_unregister_device(struct hci_uart *hu) | |
358 | { | |
359 | struct hci_dev *hdev = hu->hdev; | |
360 | ||
361 | hci_unregister_dev(hdev); | |
362 | hci_free_dev(hdev); | |
363 | ||
364 | cancel_work_sync(&hu->write_work); | |
365 | ||
366 | hu->proto->close(hu); | |
367 | } | |
368 | EXPORT_SYMBOL_GPL(hci_uart_unregister_device); |