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
43static 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
56MODULE_DEVICE_TABLE(sdio, btsdio_table);
57
58struct 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
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] = hci_skb_pkt_type(skb);
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
106static 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
128static 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 */
150 return -ENOMEM;
151 }
152
153 skb_put(skb, len - 4);
154
155 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
156 if (err < 0) {
157 kfree_skb(skb);
158 return err;
159 }
160
161 data->hdev->stat.byte_rx += len;
162
163 hci_skb_pkt_type(skb) = hdr[3];
164
165 err = hci_recv_frame(data->hdev, skb);
166 if (err < 0)
167 return err;
168
169 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
170
171 return 0;
172}
173
174static void btsdio_interrupt(struct sdio_func *func)
175{
176 struct btsdio_data *data = sdio_get_drvdata(func);
177 int intrd;
178
179 BT_DBG("%s", data->hdev->name);
180
181 intrd = sdio_readb(func, REG_INTRD, NULL);
182 if (intrd & 0x01) {
183 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
184
185 if (btsdio_rx_packet(data) < 0) {
186 data->hdev->stat.err_rx++;
187 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
188 }
189 }
190}
191
192static int btsdio_open(struct hci_dev *hdev)
193{
194 struct btsdio_data *data = hci_get_drvdata(hdev);
195 int err;
196
197 BT_DBG("%s", hdev->name);
198
199 sdio_claim_host(data->func);
200
201 err = sdio_enable_func(data->func);
202 if (err < 0)
203 goto release;
204
205 err = sdio_claim_irq(data->func, btsdio_interrupt);
206 if (err < 0) {
207 sdio_disable_func(data->func);
208 goto release;
209 }
210
211 if (data->func->class == SDIO_CLASS_BT_B)
212 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
213
214 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
215
216release:
217 sdio_release_host(data->func);
218
219 return err;
220}
221
222static int btsdio_close(struct hci_dev *hdev)
223{
224 struct btsdio_data *data = hci_get_drvdata(hdev);
225
226 BT_DBG("%s", hdev->name);
227
228 sdio_claim_host(data->func);
229
230 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
231
232 sdio_release_irq(data->func);
233 sdio_disable_func(data->func);
234
235 sdio_release_host(data->func);
236
237 return 0;
238}
239
240static int btsdio_flush(struct hci_dev *hdev)
241{
242 struct btsdio_data *data = hci_get_drvdata(hdev);
243
244 BT_DBG("%s", hdev->name);
245
246 skb_queue_purge(&data->txq);
247
248 return 0;
249}
250
251static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
252{
253 struct btsdio_data *data = hci_get_drvdata(hdev);
254
255 BT_DBG("%s", hdev->name);
256
257 switch (hci_skb_pkt_type(skb)) {
258 case HCI_COMMAND_PKT:
259 hdev->stat.cmd_tx++;
260 break;
261
262 case HCI_ACLDATA_PKT:
263 hdev->stat.acl_tx++;
264 break;
265
266 case HCI_SCODATA_PKT:
267 hdev->stat.sco_tx++;
268 break;
269
270 default:
271 return -EILSEQ;
272 }
273
274 skb_queue_tail(&data->txq, skb);
275
276 schedule_work(&data->work);
277
278 return 0;
279}
280
281static int btsdio_probe(struct sdio_func *func,
282 const struct sdio_device_id *id)
283{
284 struct btsdio_data *data;
285 struct hci_dev *hdev;
286 struct sdio_func_tuple *tuple = func->tuples;
287 int err;
288
289 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
290
291 while (tuple) {
292 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
293 tuple = tuple->next;
294 }
295
296 /* Broadcom devices soldered onto the PCB (non-removable) use an
297 * UART connection for Bluetooth, ignore the BT SDIO interface.
298 */
299 if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&
300 !mmc_card_is_removable(func->card->host)) {
301 switch (func->device) {
302 case SDIO_DEVICE_ID_BROADCOM_43341:
303 case SDIO_DEVICE_ID_BROADCOM_43430:
304 return -ENODEV;
305 }
306 }
307
308 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
309 if (!data)
310 return -ENOMEM;
311
312 data->func = func;
313
314 INIT_WORK(&data->work, btsdio_work);
315
316 skb_queue_head_init(&data->txq);
317
318 hdev = hci_alloc_dev();
319 if (!hdev)
320 return -ENOMEM;
321
322 hdev->bus = HCI_SDIO;
323 hci_set_drvdata(hdev, data);
324
325 if (id->class == SDIO_CLASS_BT_AMP)
326 hdev->dev_type = HCI_AMP;
327 else
328 hdev->dev_type = HCI_PRIMARY;
329
330 data->hdev = hdev;
331
332 SET_HCIDEV_DEV(hdev, &func->dev);
333
334 hdev->open = btsdio_open;
335 hdev->close = btsdio_close;
336 hdev->flush = btsdio_flush;
337 hdev->send = btsdio_send_frame;
338
339 if (func->vendor == 0x0104 && func->device == 0x00c5)
340 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
341
342 err = hci_register_dev(hdev);
343 if (err < 0) {
344 hci_free_dev(hdev);
345 return err;
346 }
347
348 sdio_set_drvdata(func, data);
349
350 return 0;
351}
352
353static void btsdio_remove(struct sdio_func *func)
354{
355 struct btsdio_data *data = sdio_get_drvdata(func);
356 struct hci_dev *hdev;
357
358 BT_DBG("func %p", func);
359
360 if (!data)
361 return;
362
363 hdev = data->hdev;
364
365 sdio_set_drvdata(func, NULL);
366
367 hci_unregister_dev(hdev);
368
369 hci_free_dev(hdev);
370}
371
372static struct sdio_driver btsdio_driver = {
373 .name = "btsdio",
374 .probe = btsdio_probe,
375 .remove = btsdio_remove,
376 .id_table = btsdio_table,
377};
378
379static int __init btsdio_init(void)
380{
381 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
382
383 return sdio_register_driver(&btsdio_driver);
384}
385
386static void __exit btsdio_exit(void)
387{
388 sdio_unregister_driver(&btsdio_driver);
389}
390
391module_init(btsdio_init);
392module_exit(btsdio_exit);
393
394MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
395MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
396MODULE_VERSION(VERSION);
397MODULE_LICENSE("GPL");
398