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ddbaf13e MH |
1 | /* |
2 | * | |
3 | * Generic Bluetooth SDIO driver | |
4 | * | |
5 | * Copyright (C) 2007 Cambridge Silicon Radio Ltd. | |
6 | * Copyright (C) 2007 Marcel Holtmann <marcel@holtmann.org> | |
7 | * | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/skbuff.h> | |
33 | ||
34 | #include <linux/mmc/sdio_ids.h> | |
35 | #include <linux/mmc/sdio_func.h> | |
36 | ||
37 | #include <net/bluetooth/bluetooth.h> | |
38 | #include <net/bluetooth/hci_core.h> | |
39 | ||
ddbaf13e MH |
40 | #define VERSION "0.1" |
41 | ||
42 | static const struct sdio_device_id btsdio_table[] = { | |
43 | /* Generic Bluetooth Type-A SDIO device */ | |
44 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) }, | |
45 | ||
46 | /* Generic Bluetooth Type-B SDIO device */ | |
47 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) }, | |
48 | ||
fb3d8eb4 DV |
49 | /* Generic Bluetooth AMP controller */ |
50 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) }, | |
51 | ||
ddbaf13e MH |
52 | { } /* Terminating entry */ |
53 | }; | |
54 | ||
55 | MODULE_DEVICE_TABLE(sdio, btsdio_table); | |
56 | ||
57 | struct btsdio_data { | |
58 | struct hci_dev *hdev; | |
59 | struct sdio_func *func; | |
60 | ||
61 | struct work_struct work; | |
62 | ||
63 | struct sk_buff_head txq; | |
64 | }; | |
65 | ||
66 | #define REG_RDAT 0x00 /* Receiver Data */ | |
67 | #define REG_TDAT 0x00 /* Transmitter Data */ | |
68 | #define REG_PC_RRT 0x10 /* Read Packet Control */ | |
69 | #define REG_PC_WRT 0x11 /* Write Packet Control */ | |
70 | #define REG_RTC_STAT 0x12 /* Retry Control Status */ | |
71 | #define REG_RTC_SET 0x12 /* Retry Control Set */ | |
72 | #define REG_INTRD 0x13 /* Interrupt Indication */ | |
73 | #define REG_CL_INTRD 0x13 /* Interrupt Clear */ | |
74 | #define REG_EN_INTRD 0x14 /* Interrupt Enable */ | |
75 | #define REG_MD_STAT 0x20 /* Bluetooth Mode Status */ | |
bc721970 | 76 | #define REG_MD_SET 0x20 /* Bluetooth Mode Set */ |
ddbaf13e MH |
77 | |
78 | static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb) | |
79 | { | |
80 | int err; | |
81 | ||
82 | BT_DBG("%s", data->hdev->name); | |
83 | ||
84 | /* Prepend Type-A header */ | |
85 | skb_push(skb, 4); | |
86 | skb->data[0] = (skb->len & 0x0000ff); | |
87 | skb->data[1] = (skb->len & 0x00ff00) >> 8; | |
88 | skb->data[2] = (skb->len & 0xff0000) >> 16; | |
89 | skb->data[3] = bt_cb(skb)->pkt_type; | |
90 | ||
91 | err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len); | |
92 | if (err < 0) { | |
7644d63d | 93 | skb_pull(skb, 4); |
ddbaf13e MH |
94 | sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL); |
95 | return err; | |
96 | } | |
97 | ||
98 | data->hdev->stat.byte_tx += skb->len; | |
99 | ||
100 | kfree_skb(skb); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static void btsdio_work(struct work_struct *work) | |
106 | { | |
107 | struct btsdio_data *data = container_of(work, struct btsdio_data, work); | |
108 | struct sk_buff *skb; | |
109 | int err; | |
110 | ||
111 | BT_DBG("%s", data->hdev->name); | |
112 | ||
113 | sdio_claim_host(data->func); | |
114 | ||
115 | while ((skb = skb_dequeue(&data->txq))) { | |
116 | err = btsdio_tx_packet(data, skb); | |
117 | if (err < 0) { | |
118 | data->hdev->stat.err_tx++; | |
119 | skb_queue_head(&data->txq, skb); | |
120 | break; | |
121 | } | |
122 | } | |
123 | ||
124 | sdio_release_host(data->func); | |
125 | } | |
126 | ||
127 | static int btsdio_rx_packet(struct btsdio_data *data) | |
128 | { | |
129 | u8 hdr[4] __attribute__ ((aligned(4))); | |
130 | struct sk_buff *skb; | |
131 | int err, len; | |
132 | ||
133 | BT_DBG("%s", data->hdev->name); | |
134 | ||
135 | err = sdio_readsb(data->func, hdr, REG_RDAT, 4); | |
136 | if (err < 0) | |
137 | return err; | |
138 | ||
139 | len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16); | |
140 | if (len < 4 || len > 65543) | |
141 | return -EILSEQ; | |
142 | ||
143 | skb = bt_skb_alloc(len - 4, GFP_KERNEL); | |
144 | if (!skb) { | |
145 | /* Out of memory. Prepare a read retry and just | |
146 | * return with the expectation that the next time | |
147 | * we're called we'll have more memory. */ | |
148 | return -ENOMEM; | |
149 | } | |
150 | ||
151 | skb_put(skb, len - 4); | |
152 | ||
153 | err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4); | |
154 | if (err < 0) { | |
cbfd24a7 | 155 | kfree_skb(skb); |
ddbaf13e MH |
156 | return err; |
157 | } | |
158 | ||
159 | data->hdev->stat.byte_rx += len; | |
160 | ||
ddbaf13e MH |
161 | bt_cb(skb)->pkt_type = hdr[3]; |
162 | ||
e1a26170 | 163 | err = hci_recv_frame(data->hdev, skb); |
2fa99342 | 164 | if (err < 0) |
ddbaf13e | 165 | return err; |
ddbaf13e MH |
166 | |
167 | sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | static void btsdio_interrupt(struct sdio_func *func) | |
173 | { | |
174 | struct btsdio_data *data = sdio_get_drvdata(func); | |
175 | int intrd; | |
176 | ||
177 | BT_DBG("%s", data->hdev->name); | |
178 | ||
179 | intrd = sdio_readb(func, REG_INTRD, NULL); | |
180 | if (intrd & 0x01) { | |
181 | sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); | |
182 | ||
183 | if (btsdio_rx_packet(data) < 0) { | |
184 | data->hdev->stat.err_rx++; | |
185 | sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); | |
186 | } | |
187 | } | |
188 | } | |
189 | ||
190 | static int btsdio_open(struct hci_dev *hdev) | |
191 | { | |
155961e8 | 192 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
193 | int err; |
194 | ||
195 | BT_DBG("%s", hdev->name); | |
196 | ||
197 | if (test_and_set_bit(HCI_RUNNING, &hdev->flags)) | |
198 | return 0; | |
199 | ||
200 | sdio_claim_host(data->func); | |
201 | ||
202 | err = sdio_enable_func(data->func); | |
203 | if (err < 0) { | |
204 | clear_bit(HCI_RUNNING, &hdev->flags); | |
205 | goto release; | |
206 | } | |
207 | ||
208 | err = sdio_claim_irq(data->func, btsdio_interrupt); | |
209 | if (err < 0) { | |
210 | sdio_disable_func(data->func); | |
211 | clear_bit(HCI_RUNNING, &hdev->flags); | |
212 | goto release; | |
213 | } | |
214 | ||
215 | if (data->func->class == SDIO_CLASS_BT_B) | |
bc721970 | 216 | sdio_writeb(data->func, 0x00, REG_MD_SET, NULL); |
ddbaf13e MH |
217 | |
218 | sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); | |
219 | ||
220 | release: | |
221 | sdio_release_host(data->func); | |
222 | ||
223 | return err; | |
224 | } | |
225 | ||
226 | static int btsdio_close(struct hci_dev *hdev) | |
227 | { | |
155961e8 | 228 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
229 | |
230 | BT_DBG("%s", hdev->name); | |
231 | ||
232 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) | |
233 | return 0; | |
234 | ||
235 | sdio_claim_host(data->func); | |
236 | ||
237 | sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); | |
238 | ||
239 | sdio_release_irq(data->func); | |
240 | sdio_disable_func(data->func); | |
241 | ||
242 | sdio_release_host(data->func); | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | static int btsdio_flush(struct hci_dev *hdev) | |
248 | { | |
155961e8 | 249 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
250 | |
251 | BT_DBG("%s", hdev->name); | |
252 | ||
253 | skb_queue_purge(&data->txq); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
7bd8f09f | 258 | static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
ddbaf13e | 259 | { |
155961e8 | 260 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
261 | |
262 | BT_DBG("%s", hdev->name); | |
263 | ||
264 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
265 | return -EBUSY; | |
266 | ||
267 | switch (bt_cb(skb)->pkt_type) { | |
268 | case HCI_COMMAND_PKT: | |
269 | hdev->stat.cmd_tx++; | |
270 | break; | |
271 | ||
272 | case HCI_ACLDATA_PKT: | |
273 | hdev->stat.acl_tx++; | |
274 | break; | |
275 | ||
276 | case HCI_SCODATA_PKT: | |
277 | hdev->stat.sco_tx++; | |
278 | break; | |
279 | ||
280 | default: | |
281 | return -EILSEQ; | |
282 | } | |
283 | ||
284 | skb_queue_tail(&data->txq, skb); | |
285 | ||
286 | schedule_work(&data->work); | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
ddbaf13e MH |
291 | static int btsdio_probe(struct sdio_func *func, |
292 | const struct sdio_device_id *id) | |
293 | { | |
294 | struct btsdio_data *data; | |
295 | struct hci_dev *hdev; | |
296 | struct sdio_func_tuple *tuple = func->tuples; | |
297 | int err; | |
298 | ||
299 | BT_DBG("func %p id %p class 0x%04x", func, id, func->class); | |
300 | ||
301 | while (tuple) { | |
302 | BT_DBG("code 0x%x size %d", tuple->code, tuple->size); | |
303 | tuple = tuple->next; | |
304 | } | |
305 | ||
3a382772 | 306 | data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL); |
ddbaf13e MH |
307 | if (!data) |
308 | return -ENOMEM; | |
309 | ||
310 | data->func = func; | |
311 | ||
312 | INIT_WORK(&data->work, btsdio_work); | |
313 | ||
314 | skb_queue_head_init(&data->txq); | |
315 | ||
316 | hdev = hci_alloc_dev(); | |
3a382772 | 317 | if (!hdev) |
ddbaf13e | 318 | return -ENOMEM; |
ddbaf13e | 319 | |
c13854ce | 320 | hdev->bus = HCI_SDIO; |
155961e8 | 321 | hci_set_drvdata(hdev, data); |
ddbaf13e | 322 | |
fb3d8eb4 DV |
323 | if (id->class == SDIO_CLASS_BT_AMP) |
324 | hdev->dev_type = HCI_AMP; | |
325 | else | |
326 | hdev->dev_type = HCI_BREDR; | |
327 | ||
ddbaf13e MH |
328 | data->hdev = hdev; |
329 | ||
330 | SET_HCIDEV_DEV(hdev, &func->dev); | |
331 | ||
332 | hdev->open = btsdio_open; | |
333 | hdev->close = btsdio_close; | |
334 | hdev->flush = btsdio_flush; | |
335 | hdev->send = btsdio_send_frame; | |
ddbaf13e | 336 | |
de8b5828 MH |
337 | if (func->vendor == 0x0104 && func->device == 0x00c5) |
338 | set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); | |
339 | ||
ddbaf13e MH |
340 | err = hci_register_dev(hdev); |
341 | if (err < 0) { | |
342 | hci_free_dev(hdev); | |
ddbaf13e MH |
343 | return err; |
344 | } | |
345 | ||
346 | sdio_set_drvdata(func, data); | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | static void btsdio_remove(struct sdio_func *func) | |
352 | { | |
353 | struct btsdio_data *data = sdio_get_drvdata(func); | |
354 | struct hci_dev *hdev; | |
355 | ||
356 | BT_DBG("func %p", func); | |
357 | ||
358 | if (!data) | |
359 | return; | |
360 | ||
361 | hdev = data->hdev; | |
362 | ||
363 | sdio_set_drvdata(func, NULL); | |
364 | ||
365 | hci_unregister_dev(hdev); | |
366 | ||
367 | hci_free_dev(hdev); | |
368 | } | |
369 | ||
370 | static struct sdio_driver btsdio_driver = { | |
371 | .name = "btsdio", | |
372 | .probe = btsdio_probe, | |
373 | .remove = btsdio_remove, | |
374 | .id_table = btsdio_table, | |
375 | }; | |
376 | ||
377 | static int __init btsdio_init(void) | |
378 | { | |
379 | BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); | |
380 | ||
381 | return sdio_register_driver(&btsdio_driver); | |
382 | } | |
383 | ||
384 | static void __exit btsdio_exit(void) | |
385 | { | |
386 | sdio_unregister_driver(&btsdio_driver); | |
387 | } | |
388 | ||
389 | module_init(btsdio_init); | |
390 | module_exit(btsdio_exit); | |
391 | ||
392 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
393 | MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); | |
394 | MODULE_VERSION(VERSION); | |
395 | MODULE_LICENSE("GPL"); |