tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
42static 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 { } /* Terminating entry */
50};
51
52MODULE_DEVICE_TABLE(sdio, btsdio_table);
53
54struct btsdio_data {
55 struct hci_dev *hdev;
56 struct sdio_func *func;
57
58 struct work_struct work;
59
60 struct sk_buff_head txq;
61};
62
63#define REG_RDAT 0x00 /* Receiver Data */
64#define REG_TDAT 0x00 /* Transmitter Data */
65#define REG_PC_RRT 0x10 /* Read Packet Control */
66#define REG_PC_WRT 0x11 /* Write Packet Control */
67#define REG_RTC_STAT 0x12 /* Retry Control Status */
68#define REG_RTC_SET 0x12 /* Retry Control Set */
69#define REG_INTRD 0x13 /* Interrupt Indication */
70#define REG_CL_INTRD 0x13 /* Interrupt Clear */
71#define REG_EN_INTRD 0x14 /* Interrupt Enable */
72#define REG_MD_STAT 0x20 /* Bluetooth Mode Status */
73
74static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
75{
76 int err;
77
78 BT_DBG("%s", data->hdev->name);
79
80 /* Prepend Type-A header */
81 skb_push(skb, 4);
82 skb->data[0] = (skb->len & 0x0000ff);
83 skb->data[1] = (skb->len & 0x00ff00) >> 8;
84 skb->data[2] = (skb->len & 0xff0000) >> 16;
85 skb->data[3] = bt_cb(skb)->pkt_type;
86
87 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
88 if (err < 0) {
89 skb_pull(skb, 4);
90 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
91 return err;
92 }
93
94 data->hdev->stat.byte_tx += skb->len;
95
96 kfree_skb(skb);
97
98 return 0;
99}
100
101static void btsdio_work(struct work_struct *work)
102{
103 struct btsdio_data *data = container_of(work, struct btsdio_data, work);
104 struct sk_buff *skb;
105 int err;
106
107 BT_DBG("%s", data->hdev->name);
108
109 sdio_claim_host(data->func);
110
111 while ((skb = skb_dequeue(&data->txq))) {
112 err = btsdio_tx_packet(data, skb);
113 if (err < 0) {
114 data->hdev->stat.err_tx++;
115 skb_queue_head(&data->txq, skb);
116 break;
117 }
118 }
119
120 sdio_release_host(data->func);
121}
122
123static int btsdio_rx_packet(struct btsdio_data *data)
124{
125 u8 hdr[4] __attribute__ ((aligned(4)));
126 struct sk_buff *skb;
127 int err, len;
128
129 BT_DBG("%s", data->hdev->name);
130
131 err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
132 if (err < 0)
133 return err;
134
135 len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
136 if (len < 4 || len > 65543)
137 return -EILSEQ;
138
139 skb = bt_skb_alloc(len - 4, GFP_KERNEL);
140 if (!skb) {
141 /* Out of memory. Prepare a read retry and just
142 * return with the expectation that the next time
143 * we're called we'll have more memory. */
144 return -ENOMEM;
145 }
146
147 skb_put(skb, len - 4);
148
149 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
150 if (err < 0) {
151 kfree_skb(skb);
152 return err;
153 }
154
155 data->hdev->stat.byte_rx += len;
156
157 skb->dev = (void *) data->hdev;
158 bt_cb(skb)->pkt_type = hdr[3];
159
160 err = hci_recv_frame(skb);
161 if (err < 0)
162 return err;
163
164 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
165
166 return 0;
167}
168
169static void btsdio_interrupt(struct sdio_func *func)
170{
171 struct btsdio_data *data = sdio_get_drvdata(func);
172 int intrd;
173
174 BT_DBG("%s", data->hdev->name);
175
176 intrd = sdio_readb(func, REG_INTRD, NULL);
177 if (intrd & 0x01) {
178 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
179
180 if (btsdio_rx_packet(data) < 0) {
181 data->hdev->stat.err_rx++;
182 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
183 }
184 }
185}
186
187static int btsdio_open(struct hci_dev *hdev)
188{
189 struct btsdio_data *data = hdev->driver_data;
190 int err;
191
192 BT_DBG("%s", hdev->name);
193
194 if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
195 return 0;
196
197 sdio_claim_host(data->func);
198
199 err = sdio_enable_func(data->func);
200 if (err < 0) {
201 clear_bit(HCI_RUNNING, &hdev->flags);
202 goto release;
203 }
204
205 err = sdio_claim_irq(data->func, btsdio_interrupt);
206 if (err < 0) {
207 sdio_disable_func(data->func);
208 clear_bit(HCI_RUNNING, &hdev->flags);
209 goto release;
210 }
211
212 if (data->func->class == SDIO_CLASS_BT_B)
213 sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL);
214
215 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
216
217release:
218 sdio_release_host(data->func);
219
220 return err;
221}
222
223static int btsdio_close(struct hci_dev *hdev)
224{
225 struct btsdio_data *data = hdev->driver_data;
226
227 BT_DBG("%s", hdev->name);
228
229 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
230 return 0;
231
232 sdio_claim_host(data->func);
233
234 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
235
236 sdio_release_irq(data->func);
237 sdio_disable_func(data->func);
238
239 sdio_release_host(data->func);
240
241 return 0;
242}
243
244static int btsdio_flush(struct hci_dev *hdev)
245{
246 struct btsdio_data *data = hdev->driver_data;
247
248 BT_DBG("%s", hdev->name);
249
250 skb_queue_purge(&data->txq);
251
252 return 0;
253}
254
255static int btsdio_send_frame(struct sk_buff *skb)
256{
257 struct hci_dev *hdev = (struct hci_dev *) skb->dev;
258 struct btsdio_data *data = hdev->driver_data;
259
260 BT_DBG("%s", hdev->name);
261
262 if (!test_bit(HCI_RUNNING, &hdev->flags))
263 return -EBUSY;
264
265 switch (bt_cb(skb)->pkt_type) {
266 case HCI_COMMAND_PKT:
267 hdev->stat.cmd_tx++;
268 break;
269
270 case HCI_ACLDATA_PKT:
271 hdev->stat.acl_tx++;
272 break;
273
274 case HCI_SCODATA_PKT:
275 hdev->stat.sco_tx++;
276 break;
277
278 default:
279 return -EILSEQ;
280 }
281
282 skb_queue_tail(&data->txq, skb);
283
284 schedule_work(&data->work);
285
286 return 0;
287}
288
289static void btsdio_destruct(struct hci_dev *hdev)
290{
291 struct btsdio_data *data = hdev->driver_data;
292
293 BT_DBG("%s", hdev->name);
294
295 kfree(data);
296}
297
298static int btsdio_probe(struct sdio_func *func,
299 const struct sdio_device_id *id)
300{
301 struct btsdio_data *data;
302 struct hci_dev *hdev;
303 struct sdio_func_tuple *tuple = func->tuples;
304 int err;
305
306 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
307
308 while (tuple) {
309 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
310 tuple = tuple->next;
311 }
312
313 data = kzalloc(sizeof(*data), GFP_KERNEL);
314 if (!data)
315 return -ENOMEM;
316
317 data->func = func;
318
319 INIT_WORK(&data->work, btsdio_work);
320
321 skb_queue_head_init(&data->txq);
322
323 hdev = hci_alloc_dev();
324 if (!hdev) {
325 kfree(data);
326 return -ENOMEM;
327 }
328
329 hdev->type = HCI_SDIO;
330 hdev->driver_data = data;
331
332 data->hdev = hdev;
333
334 SET_HCIDEV_DEV(hdev, &func->dev);
335
336 hdev->open = btsdio_open;
337 hdev->close = btsdio_close;
338 hdev->flush = btsdio_flush;
339 hdev->send = btsdio_send_frame;
340 hdev->destruct = btsdio_destruct;
341
342 hdev->owner = THIS_MODULE;
343
344 err = hci_register_dev(hdev);
345 if (err < 0) {
346 hci_free_dev(hdev);
347 kfree(data);
348 return err;
349 }
350
351 sdio_set_drvdata(func, data);
352
353 return 0;
354}
355
356static void btsdio_remove(struct sdio_func *func)
357{
358 struct btsdio_data *data = sdio_get_drvdata(func);
359 struct hci_dev *hdev;
360
361 BT_DBG("func %p", func);
362
363 if (!data)
364 return;
365
366 hdev = data->hdev;
367
368 sdio_set_drvdata(func, NULL);
369
370 hci_unregister_dev(hdev);
371
372 hci_free_dev(hdev);
373}
374
375static struct sdio_driver btsdio_driver = {
376 .name = "btsdio",
377 .probe = btsdio_probe,
378 .remove = btsdio_remove,
379 .id_table = btsdio_table,
380};
381
382static int __init btsdio_init(void)
383{
384 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
385
386 return sdio_register_driver(&btsdio_driver);
387}
388
389static void __exit btsdio_exit(void)
390{
391 sdio_unregister_driver(&btsdio_driver);
392}
393
394module_init(btsdio_init);
395module_exit(btsdio_exit);
396
397MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
398MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
399MODULE_VERSION(VERSION);
400MODULE_LICENSE("GPL");