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 #define REG_MD_SET 0x20 /* Bluetooth Mode Set */
77
btsdio_tx_packet(struct btsdio_data * data,struct sk_buff * skb)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) {
93 skb_pull(skb, 4);
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
btsdio_work(struct work_struct * work)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
btsdio_rx_packet(struct btsdio_data * data)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) {
155 kfree_skb(skb);
156 return err;
157 }
158
159 data->hdev->stat.byte_rx += len;
160
161 bt_cb(skb)->pkt_type = hdr[3];
162
163 err = hci_recv_frame(data->hdev, 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
btsdio_interrupt(struct sdio_func * func)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
btsdio_open(struct hci_dev * hdev)190 static int btsdio_open(struct hci_dev *hdev)
191 {
192 struct btsdio_data *data = hci_get_drvdata(hdev);
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_SET, 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
btsdio_close(struct hci_dev * hdev)226 static int btsdio_close(struct hci_dev *hdev)
227 {
228 struct btsdio_data *data = hci_get_drvdata(hdev);
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
btsdio_flush(struct hci_dev * hdev)247 static int btsdio_flush(struct hci_dev *hdev)
248 {
249 struct btsdio_data *data = hci_get_drvdata(hdev);
250
251 BT_DBG("%s", hdev->name);
252
253 skb_queue_purge(&data->txq);
254
255 return 0;
256 }
257
btsdio_send_frame(struct hci_dev * hdev,struct sk_buff * skb)258 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
259 {
260 struct btsdio_data *data = hci_get_drvdata(hdev);
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
btsdio_probe(struct sdio_func * func,const struct sdio_device_id * id)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
306 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
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();
317 if (!hdev)
318 return -ENOMEM;
319
320 hdev->bus = HCI_SDIO;
321 hci_set_drvdata(hdev, data);
322
323 if (id->class == SDIO_CLASS_BT_AMP)
324 hdev->dev_type = HCI_AMP;
325 else
326 hdev->dev_type = HCI_BREDR;
327
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;
336
337 if (func->vendor == 0x0104 && func->device == 0x00c5)
338 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
339
340 err = hci_register_dev(hdev);
341 if (err < 0) {
342 hci_free_dev(hdev);
343 return err;
344 }
345
346 sdio_set_drvdata(func, data);
347
348 return 0;
349 }
350
btsdio_remove(struct sdio_func * func)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
btsdio_init(void)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
btsdio_exit(void)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");
396