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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 | ||
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 | ||
49 | /* Generic Bluetooth AMP controller */ | |
50 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) }, | |
51 | ||
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 */ | |
76 | ||
77 | static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb) | |
78 | { | |
79 | int err; | |
80 | ||
81 | BT_DBG("%s", data->hdev->name); | |
82 | ||
83 | /* Prepend Type-A header */ | |
84 | skb_push(skb, 4); | |
85 | skb->data[0] = (skb->len & 0x0000ff); | |
86 | skb->data[1] = (skb->len & 0x00ff00) >> 8; | |
87 | skb->data[2] = (skb->len & 0xff0000) >> 16; | |
88 | skb->data[3] = bt_cb(skb)->pkt_type; | |
89 | ||
90 | err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len); | |
91 | if (err < 0) { | |
92 | skb_pull(skb, 4); | |
93 | sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL); | |
94 | return err; | |
95 | } | |
96 | ||
97 | data->hdev->stat.byte_tx += skb->len; | |
98 | ||
99 | kfree_skb(skb); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static void btsdio_work(struct work_struct *work) | |
105 | { | |
106 | struct btsdio_data *data = container_of(work, struct btsdio_data, work); | |
107 | struct sk_buff *skb; | |
108 | int err; | |
109 | ||
110 | BT_DBG("%s", data->hdev->name); | |
111 | ||
112 | sdio_claim_host(data->func); | |
113 | ||
114 | while ((skb = skb_dequeue(&data->txq))) { | |
115 | err = btsdio_tx_packet(data, skb); | |
116 | if (err < 0) { | |
117 | data->hdev->stat.err_tx++; | |
118 | skb_queue_head(&data->txq, skb); | |
119 | break; | |
120 | } | |
121 | } | |
122 | ||
123 | sdio_release_host(data->func); | |
124 | } | |
125 | ||
126 | static int btsdio_rx_packet(struct btsdio_data *data) | |
127 | { | |
128 | u8 hdr[4] __attribute__ ((aligned(4))); | |
129 | struct sk_buff *skb; | |
130 | int err, len; | |
131 | ||
132 | BT_DBG("%s", data->hdev->name); | |
133 | ||
134 | err = sdio_readsb(data->func, hdr, REG_RDAT, 4); | |
135 | if (err < 0) | |
136 | return err; | |
137 | ||
138 | len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16); | |
139 | if (len < 4 || len > 65543) | |
140 | return -EILSEQ; | |
141 | ||
142 | skb = bt_skb_alloc(len - 4, GFP_KERNEL); | |
143 | if (!skb) { | |
144 | /* Out of memory. Prepare a read retry and just | |
145 | * return with the expectation that the next time | |
146 | * we're called we'll have more memory. */ | |
147 | return -ENOMEM; | |
148 | } | |
149 | ||
150 | skb_put(skb, len - 4); | |
151 | ||
152 | err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4); | |
153 | if (err < 0) { | |
154 | kfree_skb(skb); | |
155 | return err; | |
156 | } | |
157 | ||
158 | data->hdev->stat.byte_rx += len; | |
159 | ||
160 | skb->dev = (void *) data->hdev; | |
161 | bt_cb(skb)->pkt_type = hdr[3]; | |
162 | ||
163 | err = hci_recv_frame(skb); | |
164 | if (err < 0) | |
165 | return err; | |
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 | { | |
192 | struct btsdio_data *data = hdev->driver_data; | |
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) | |
216 | sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL); | |
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 | { | |
228 | struct btsdio_data *data = hdev->driver_data; | |
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 | { | |
249 | struct btsdio_data *data = hdev->driver_data; | |
250 | ||
251 | BT_DBG("%s", hdev->name); | |
252 | ||
253 | skb_queue_purge(&data->txq); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static int btsdio_send_frame(struct sk_buff *skb) | |
259 | { | |
260 | struct hci_dev *hdev = (struct hci_dev *) skb->dev; | |
261 | struct btsdio_data *data = hdev->driver_data; | |
262 | ||
263 | BT_DBG("%s", hdev->name); | |
264 | ||
265 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
266 | return -EBUSY; | |
267 | ||
268 | switch (bt_cb(skb)->pkt_type) { | |
269 | case HCI_COMMAND_PKT: | |
270 | hdev->stat.cmd_tx++; | |
271 | break; | |
272 | ||
273 | case HCI_ACLDATA_PKT: | |
274 | hdev->stat.acl_tx++; | |
275 | break; | |
276 | ||
277 | case HCI_SCODATA_PKT: | |
278 | hdev->stat.sco_tx++; | |
279 | break; | |
280 | ||
281 | default: | |
282 | return -EILSEQ; | |
283 | } | |
284 | ||
285 | skb_queue_tail(&data->txq, skb); | |
286 | ||
287 | schedule_work(&data->work); | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | static void btsdio_destruct(struct hci_dev *hdev) | |
293 | { | |
294 | struct btsdio_data *data = hdev->driver_data; | |
295 | ||
296 | BT_DBG("%s", hdev->name); | |
297 | ||
298 | kfree(data); | |
299 | } | |
300 | ||
301 | static int btsdio_probe(struct sdio_func *func, | |
302 | const struct sdio_device_id *id) | |
303 | { | |
304 | struct btsdio_data *data; | |
305 | struct hci_dev *hdev; | |
306 | struct sdio_func_tuple *tuple = func->tuples; | |
307 | int err; | |
308 | ||
309 | BT_DBG("func %p id %p class 0x%04x", func, id, func->class); | |
310 | ||
311 | while (tuple) { | |
312 | BT_DBG("code 0x%x size %d", tuple->code, tuple->size); | |
313 | tuple = tuple->next; | |
314 | } | |
315 | ||
316 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
317 | if (!data) | |
318 | return -ENOMEM; | |
319 | ||
320 | data->func = func; | |
321 | ||
322 | INIT_WORK(&data->work, btsdio_work); | |
323 | ||
324 | skb_queue_head_init(&data->txq); | |
325 | ||
326 | hdev = hci_alloc_dev(); | |
327 | if (!hdev) { | |
328 | kfree(data); | |
329 | return -ENOMEM; | |
330 | } | |
331 | ||
332 | hdev->bus = HCI_SDIO; | |
333 | hdev->driver_data = data; | |
334 | ||
335 | if (id->class == SDIO_CLASS_BT_AMP) | |
336 | hdev->dev_type = HCI_AMP; | |
337 | else | |
338 | hdev->dev_type = HCI_BREDR; | |
339 | ||
340 | data->hdev = hdev; | |
341 | ||
342 | SET_HCIDEV_DEV(hdev, &func->dev); | |
343 | ||
344 | hdev->open = btsdio_open; | |
345 | hdev->close = btsdio_close; | |
346 | hdev->flush = btsdio_flush; | |
347 | hdev->send = btsdio_send_frame; | |
348 | hdev->destruct = btsdio_destruct; | |
349 | ||
350 | hdev->owner = THIS_MODULE; | |
351 | ||
352 | err = hci_register_dev(hdev); | |
353 | if (err < 0) { | |
354 | hci_free_dev(hdev); | |
355 | kfree(data); | |
356 | return err; | |
357 | } | |
358 | ||
359 | sdio_set_drvdata(func, data); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static void btsdio_remove(struct sdio_func *func) | |
365 | { | |
366 | struct btsdio_data *data = sdio_get_drvdata(func); | |
367 | struct hci_dev *hdev; | |
368 | ||
369 | BT_DBG("func %p", func); | |
370 | ||
371 | if (!data) | |
372 | return; | |
373 | ||
374 | hdev = data->hdev; | |
375 | ||
376 | sdio_set_drvdata(func, NULL); | |
377 | ||
378 | hci_unregister_dev(hdev); | |
379 | ||
380 | hci_free_dev(hdev); | |
381 | } | |
382 | ||
383 | static struct sdio_driver btsdio_driver = { | |
384 | .name = "btsdio", | |
385 | .probe = btsdio_probe, | |
386 | .remove = btsdio_remove, | |
387 | .id_table = btsdio_table, | |
388 | }; | |
389 | ||
390 | static int __init btsdio_init(void) | |
391 | { | |
392 | BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); | |
393 | ||
394 | return sdio_register_driver(&btsdio_driver); | |
395 | } | |
396 | ||
397 | static void __exit btsdio_exit(void) | |
398 | { | |
399 | sdio_unregister_driver(&btsdio_driver); | |
400 | } | |
401 | ||
402 | module_init(btsdio_init); | |
403 | module_exit(btsdio_exit); | |
404 | ||
405 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
406 | MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); | |
407 | MODULE_VERSION(VERSION); | |
408 | MODULE_LICENSE("GPL"); |