blob: b786f618790210857f429bea9d21eb83266c1499 [file] [log] [blame]
Marcel Holtmannddbaf132007-10-20 14:02:04 +02001/*
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#ifndef CONFIG_BT_HCIBTSDIO_DEBUG
41#undef BT_DBG
42#define BT_DBG(D...)
43#endif
44
45#define VERSION "0.1"
46
47static const struct sdio_device_id btsdio_table[] = {
48 /* Generic Bluetooth Type-A SDIO device */
49 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
50
51 /* Generic Bluetooth Type-B SDIO device */
52 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
53
54 { } /* Terminating entry */
55};
56
57MODULE_DEVICE_TABLE(sdio, btsdio_table);
58
59struct btsdio_data {
60 struct hci_dev *hdev;
61 struct sdio_func *func;
62
63 struct work_struct work;
64
65 struct sk_buff_head txq;
66};
67
68#define REG_RDAT 0x00 /* Receiver Data */
69#define REG_TDAT 0x00 /* Transmitter Data */
70#define REG_PC_RRT 0x10 /* Read Packet Control */
71#define REG_PC_WRT 0x11 /* Write Packet Control */
72#define REG_RTC_STAT 0x12 /* Retry Control Status */
73#define REG_RTC_SET 0x12 /* Retry Control Set */
74#define REG_INTRD 0x13 /* Interrupt Indication */
75#define REG_CL_INTRD 0x13 /* Interrupt Clear */
76#define REG_EN_INTRD 0x14 /* Interrupt Enable */
77#define REG_MD_STAT 0x20 /* Bluetooth Mode Status */
78
79static 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 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
105static 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
127static 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);
156 return err;
157 }
158
159 data->hdev->stat.byte_rx += len;
160
161 skb->dev = (void *) data->hdev;
162 bt_cb(skb)->pkt_type = hdr[3];
163
164 err = hci_recv_frame(skb);
165 if (err < 0) {
166 kfree(skb);
167 return err;
168 }
169
170 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
171
172 return 0;
173}
174
175static void btsdio_interrupt(struct sdio_func *func)
176{
177 struct btsdio_data *data = sdio_get_drvdata(func);
178 int intrd;
179
180 BT_DBG("%s", data->hdev->name);
181
182 intrd = sdio_readb(func, REG_INTRD, NULL);
183 if (intrd & 0x01) {
184 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
185
186 if (btsdio_rx_packet(data) < 0) {
187 data->hdev->stat.err_rx++;
188 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
189 }
190 }
191}
192
193static int btsdio_open(struct hci_dev *hdev)
194{
195 struct btsdio_data *data = hdev->driver_data;
196 int err;
197
198 BT_DBG("%s", hdev->name);
199
200 if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
201 return 0;
202
203 sdio_claim_host(data->func);
204
205 err = sdio_enable_func(data->func);
206 if (err < 0) {
207 clear_bit(HCI_RUNNING, &hdev->flags);
208 goto release;
209 }
210
211 err = sdio_claim_irq(data->func, btsdio_interrupt);
212 if (err < 0) {
213 sdio_disable_func(data->func);
214 clear_bit(HCI_RUNNING, &hdev->flags);
215 goto release;
216 }
217
218 if (data->func->class == SDIO_CLASS_BT_B)
219 sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL);
220
221 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
222
223release:
224 sdio_release_host(data->func);
225
226 return err;
227}
228
229static int btsdio_close(struct hci_dev *hdev)
230{
231 struct btsdio_data *data = hdev->driver_data;
232
233 BT_DBG("%s", hdev->name);
234
235 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
236 return 0;
237
238 sdio_claim_host(data->func);
239
240 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
241
242 sdio_release_irq(data->func);
243 sdio_disable_func(data->func);
244
245 sdio_release_host(data->func);
246
247 return 0;
248}
249
250static int btsdio_flush(struct hci_dev *hdev)
251{
252 struct btsdio_data *data = hdev->driver_data;
253
254 BT_DBG("%s", hdev->name);
255
256 skb_queue_purge(&data->txq);
257
258 return 0;
259}
260
261static int btsdio_send_frame(struct sk_buff *skb)
262{
263 struct hci_dev *hdev = (struct hci_dev *) skb->dev;
264 struct btsdio_data *data = hdev->driver_data;
265
266 BT_DBG("%s", hdev->name);
267
268 if (!test_bit(HCI_RUNNING, &hdev->flags))
269 return -EBUSY;
270
271 switch (bt_cb(skb)->pkt_type) {
272 case HCI_COMMAND_PKT:
273 hdev->stat.cmd_tx++;
274 break;
275
276 case HCI_ACLDATA_PKT:
277 hdev->stat.acl_tx++;
278 break;
279
280 case HCI_SCODATA_PKT:
281 hdev->stat.sco_tx++;
282 break;
283
284 default:
285 return -EILSEQ;
286 }
287
288 skb_queue_tail(&data->txq, skb);
289
290 schedule_work(&data->work);
291
292 return 0;
293}
294
295static void btsdio_destruct(struct hci_dev *hdev)
296{
297 struct btsdio_data *data = hdev->driver_data;
298
299 BT_DBG("%s", hdev->name);
300
301 kfree(data);
302}
303
304static int btsdio_probe(struct sdio_func *func,
305 const struct sdio_device_id *id)
306{
307 struct btsdio_data *data;
308 struct hci_dev *hdev;
309 struct sdio_func_tuple *tuple = func->tuples;
310 int err;
311
312 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
313
314 while (tuple) {
315 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
316 tuple = tuple->next;
317 }
318
319 data = kzalloc(sizeof(*data), GFP_KERNEL);
320 if (!data)
321 return -ENOMEM;
322
323 data->func = func;
324
325 INIT_WORK(&data->work, btsdio_work);
326
327 skb_queue_head_init(&data->txq);
328
329 hdev = hci_alloc_dev();
330 if (!hdev) {
331 kfree(data);
332 return -ENOMEM;
333 }
334
335 hdev->type = HCI_SDIO;
336 hdev->driver_data = data;
337
338 data->hdev = hdev;
339
340 SET_HCIDEV_DEV(hdev, &func->dev);
341
342 hdev->open = btsdio_open;
343 hdev->close = btsdio_close;
344 hdev->flush = btsdio_flush;
345 hdev->send = btsdio_send_frame;
346 hdev->destruct = btsdio_destruct;
347
348 hdev->owner = THIS_MODULE;
349
350 err = hci_register_dev(hdev);
351 if (err < 0) {
352 hci_free_dev(hdev);
353 kfree(data);
354 return err;
355 }
356
357 sdio_set_drvdata(func, data);
358
359 return 0;
360}
361
362static void btsdio_remove(struct sdio_func *func)
363{
364 struct btsdio_data *data = sdio_get_drvdata(func);
365 struct hci_dev *hdev;
366
367 BT_DBG("func %p", func);
368
369 if (!data)
370 return;
371
372 hdev = data->hdev;
373
374 sdio_set_drvdata(func, NULL);
375
376 hci_unregister_dev(hdev);
377
378 hci_free_dev(hdev);
379}
380
381static struct sdio_driver btsdio_driver = {
382 .name = "btsdio",
383 .probe = btsdio_probe,
384 .remove = btsdio_remove,
385 .id_table = btsdio_table,
386};
387
388static int __init btsdio_init(void)
389{
390 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
391
392 return sdio_register_driver(&btsdio_driver);
393}
394
395static void __exit btsdio_exit(void)
396{
397 sdio_unregister_driver(&btsdio_driver);
398}
399
400module_init(btsdio_init);
401module_exit(btsdio_exit);
402
403MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
404MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
405MODULE_VERSION(VERSION);
406MODULE_LICENSE("GPL");