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/host.h>
35 #include <linux/mmc/sdio_ids.h>
36 #include <linux/mmc/sdio_func.h>
37
38 #include <net/bluetooth/bluetooth.h>
39 #include <net/bluetooth/hci_core.h>
40
41 #define VERSION "0.1"
42
43 static const struct sdio_device_id btsdio_table[] = {
44 /* Generic Bluetooth Type-A SDIO device */
45 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
46
47 /* Generic Bluetooth Type-B SDIO device */
48 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
49
50 /* Generic Bluetooth AMP controller */
51 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) },
52
53 { } /* Terminating entry */
54 };
55
56 MODULE_DEVICE_TABLE(sdio, btsdio_table);
57
58 struct btsdio_data {
59 struct hci_dev *hdev;
60 struct sdio_func *func;
61
62 struct work_struct work;
63
64 struct sk_buff_head txq;
65 };
66
67 #define REG_RDAT 0x00 /* Receiver Data */
68 #define REG_TDAT 0x00 /* Transmitter Data */
69 #define REG_PC_RRT 0x10 /* Read Packet Control */
70 #define REG_PC_WRT 0x11 /* Write Packet Control */
71 #define REG_RTC_STAT 0x12 /* Retry Control Status */
72 #define REG_RTC_SET 0x12 /* Retry Control Set */
73 #define REG_INTRD 0x13 /* Interrupt Indication */
74 #define REG_CL_INTRD 0x13 /* Interrupt Clear */
75 #define REG_EN_INTRD 0x14 /* Interrupt Enable */
76 #define REG_MD_STAT 0x20 /* Bluetooth Mode Status */
77 #define REG_MD_SET 0x20 /* Bluetooth Mode Set */
78
btsdio_tx_packet(struct btsdio_data * data,struct sk_buff * skb)79 static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
80 {
81 int err;
82
83 BT_DBG("%s", data->hdev->name);
84
85 /* Prepend Type-A header */
86 skb_push(skb, 4);
87 skb->data[0] = (skb->len & 0x0000ff);
88 skb->data[1] = (skb->len & 0x00ff00) >> 8;
89 skb->data[2] = (skb->len & 0xff0000) >> 16;
90 skb->data[3] = bt_cb(skb)->pkt_type;
91
92 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
93 if (err < 0) {
94 skb_pull(skb, 4);
95 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
96 return err;
97 }
98
99 data->hdev->stat.byte_tx += skb->len;
100
101 kfree_skb(skb);
102
103 return 0;
104 }
105
btsdio_work(struct work_struct * work)106 static void btsdio_work(struct work_struct *work)
107 {
108 struct btsdio_data *data = container_of(work, struct btsdio_data, work);
109 struct sk_buff *skb;
110 int err;
111
112 BT_DBG("%s", data->hdev->name);
113
114 sdio_claim_host(data->func);
115
116 while ((skb = skb_dequeue(&data->txq))) {
117 err = btsdio_tx_packet(data, skb);
118 if (err < 0) {
119 data->hdev->stat.err_tx++;
120 skb_queue_head(&data->txq, skb);
121 break;
122 }
123 }
124
125 sdio_release_host(data->func);
126 }
127
btsdio_rx_packet(struct btsdio_data * data)128 static int btsdio_rx_packet(struct btsdio_data *data)
129 {
130 u8 hdr[4] __attribute__ ((aligned(4)));
131 struct sk_buff *skb;
132 int err, len;
133
134 BT_DBG("%s", data->hdev->name);
135
136 err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
137 if (err < 0)
138 return err;
139
140 len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
141 if (len < 4 || len > 65543)
142 return -EILSEQ;
143
144 skb = bt_skb_alloc(len - 4, GFP_KERNEL);
145 if (!skb) {
146 /* Out of memory. Prepare a read retry and just
147 * return with the expectation that the next time
148 * we're called we'll have more memory. */
149 return -ENOMEM;
150 }
151
152 skb_put(skb, len - 4);
153
154 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
155 if (err < 0) {
156 kfree_skb(skb);
157 return err;
158 }
159
160 data->hdev->stat.byte_rx += len;
161
162 bt_cb(skb)->pkt_type = hdr[3];
163
164 err = hci_recv_frame(data->hdev, skb);
165 if (err < 0)
166 return err;
167
168 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
169
170 return 0;
171 }
172
btsdio_interrupt(struct sdio_func * func)173 static void btsdio_interrupt(struct sdio_func *func)
174 {
175 struct btsdio_data *data = sdio_get_drvdata(func);
176 int intrd;
177
178 BT_DBG("%s", data->hdev->name);
179
180 intrd = sdio_readb(func, REG_INTRD, NULL);
181 if (intrd & 0x01) {
182 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
183
184 if (btsdio_rx_packet(data) < 0) {
185 data->hdev->stat.err_rx++;
186 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
187 }
188 }
189 }
190
btsdio_open(struct hci_dev * hdev)191 static int btsdio_open(struct hci_dev *hdev)
192 {
193 struct btsdio_data *data = hci_get_drvdata(hdev);
194 int err;
195
196 BT_DBG("%s", hdev->name);
197
198 sdio_claim_host(data->func);
199
200 err = sdio_enable_func(data->func);
201 if (err < 0)
202 goto release;
203
204 err = sdio_claim_irq(data->func, btsdio_interrupt);
205 if (err < 0) {
206 sdio_disable_func(data->func);
207 goto release;
208 }
209
210 if (data->func->class == SDIO_CLASS_BT_B)
211 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
212
213 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
214
215 release:
216 sdio_release_host(data->func);
217
218 return err;
219 }
220
btsdio_close(struct hci_dev * hdev)221 static int btsdio_close(struct hci_dev *hdev)
222 {
223 struct btsdio_data *data = hci_get_drvdata(hdev);
224
225 BT_DBG("%s", hdev->name);
226
227 sdio_claim_host(data->func);
228
229 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
230
231 sdio_release_irq(data->func);
232 sdio_disable_func(data->func);
233
234 sdio_release_host(data->func);
235
236 return 0;
237 }
238
btsdio_flush(struct hci_dev * hdev)239 static int btsdio_flush(struct hci_dev *hdev)
240 {
241 struct btsdio_data *data = hci_get_drvdata(hdev);
242
243 BT_DBG("%s", hdev->name);
244
245 skb_queue_purge(&data->txq);
246
247 return 0;
248 }
249
btsdio_send_frame(struct hci_dev * hdev,struct sk_buff * skb)250 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
251 {
252 struct btsdio_data *data = hci_get_drvdata(hdev);
253
254 BT_DBG("%s", hdev->name);
255
256 switch (bt_cb(skb)->pkt_type) {
257 case HCI_COMMAND_PKT:
258 hdev->stat.cmd_tx++;
259 break;
260
261 case HCI_ACLDATA_PKT:
262 hdev->stat.acl_tx++;
263 break;
264
265 case HCI_SCODATA_PKT:
266 hdev->stat.sco_tx++;
267 break;
268
269 default:
270 return -EILSEQ;
271 }
272
273 skb_queue_tail(&data->txq, skb);
274
275 schedule_work(&data->work);
276
277 return 0;
278 }
279
btsdio_probe(struct sdio_func * func,const struct sdio_device_id * id)280 static int btsdio_probe(struct sdio_func *func,
281 const struct sdio_device_id *id)
282 {
283 struct btsdio_data *data;
284 struct hci_dev *hdev;
285 struct sdio_func_tuple *tuple = func->tuples;
286 int err;
287
288 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
289
290 while (tuple) {
291 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
292 tuple = tuple->next;
293 }
294
295 /* BCM43341 devices soldered onto the PCB (non-removable) use an
296 * uart connection for bluetooth, ignore the BT SDIO interface.
297 */
298 if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&
299 func->device == SDIO_DEVICE_ID_BROADCOM_43341 &&
300 !mmc_card_is_removable(func->card->host))
301 return -ENODEV;
302
303 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
304 if (!data)
305 return -ENOMEM;
306
307 data->func = func;
308
309 INIT_WORK(&data->work, btsdio_work);
310
311 skb_queue_head_init(&data->txq);
312
313 hdev = hci_alloc_dev();
314 if (!hdev)
315 return -ENOMEM;
316
317 hdev->bus = HCI_SDIO;
318 hci_set_drvdata(hdev, data);
319
320 if (id->class == SDIO_CLASS_BT_AMP)
321 hdev->dev_type = HCI_AMP;
322 else
323 hdev->dev_type = HCI_BREDR;
324
325 data->hdev = hdev;
326
327 SET_HCIDEV_DEV(hdev, &func->dev);
328
329 hdev->open = btsdio_open;
330 hdev->close = btsdio_close;
331 hdev->flush = btsdio_flush;
332 hdev->send = btsdio_send_frame;
333
334 if (func->vendor == 0x0104 && func->device == 0x00c5)
335 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
336
337 err = hci_register_dev(hdev);
338 if (err < 0) {
339 hci_free_dev(hdev);
340 return err;
341 }
342
343 sdio_set_drvdata(func, data);
344
345 return 0;
346 }
347
btsdio_remove(struct sdio_func * func)348 static void btsdio_remove(struct sdio_func *func)
349 {
350 struct btsdio_data *data = sdio_get_drvdata(func);
351 struct hci_dev *hdev;
352
353 BT_DBG("func %p", func);
354
355 if (!data)
356 return;
357
358 hdev = data->hdev;
359
360 sdio_set_drvdata(func, NULL);
361
362 hci_unregister_dev(hdev);
363
364 hci_free_dev(hdev);
365 }
366
367 static struct sdio_driver btsdio_driver = {
368 .name = "btsdio",
369 .probe = btsdio_probe,
370 .remove = btsdio_remove,
371 .id_table = btsdio_table,
372 };
373
btsdio_init(void)374 static int __init btsdio_init(void)
375 {
376 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
377
378 return sdio_register_driver(&btsdio_driver);
379 }
380
btsdio_exit(void)381 static void __exit btsdio_exit(void)
382 {
383 sdio_unregister_driver(&btsdio_driver);
384 }
385
386 module_init(btsdio_init);
387 module_exit(btsdio_exit);
388
389 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
390 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
391 MODULE_VERSION(VERSION);
392 MODULE_LICENSE("GPL");
393