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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 /* Generic Bluetooth AMP controller */
50 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) },
51
52 { } /* Terminating entry */
53};
54
55MODULE_DEVICE_TABLE(sdio, btsdio_table);
56
57struct 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
77static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
78{
79 int err;
80
81 BT_DBG("%s", data->hdev->name);
82
83 /* Prepend Type-A header */
84 skb_push(skb, 4);
85 skb->data[0] = (skb->len & 0x0000ff);
86 skb->data[1] = (skb->len & 0x00ff00) >> 8;
87 skb->data[2] = (skb->len & 0xff0000) >> 16;
88 skb->data[3] = bt_cb(skb)->pkt_type;
89
90 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
91 if (err < 0) {
92 skb_pull(skb, 4);
93 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
94 return err;
95 }
96
97 data->hdev->stat.byte_tx += skb->len;
98
99 kfree_skb(skb);
100
101 return 0;
102}
103
104static void btsdio_work(struct work_struct *work)
105{
106 struct btsdio_data *data = container_of(work, struct btsdio_data, work);
107 struct sk_buff *skb;
108 int err;
109
110 BT_DBG("%s", data->hdev->name);
111
112 sdio_claim_host(data->func);
113
114 while ((skb = skb_dequeue(&data->txq))) {
115 err = btsdio_tx_packet(data, skb);
116 if (err < 0) {
117 data->hdev->stat.err_tx++;
118 skb_queue_head(&data->txq, skb);
119 break;
120 }
121 }
122
123 sdio_release_host(data->func);
124}
125
126static int btsdio_rx_packet(struct btsdio_data *data)
127{
128 u8 hdr[4] __attribute__ ((aligned(4)));
129 struct sk_buff *skb;
130 int err, len;
131
132 BT_DBG("%s", data->hdev->name);
133
134 err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
135 if (err < 0)
136 return err;
137
138 len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
139 if (len < 4 || len > 65543)
140 return -EILSEQ;
141
142 skb = bt_skb_alloc(len - 4, GFP_KERNEL);
143 if (!skb) {
144 /* Out of memory. Prepare a read retry and just
145 * return with the expectation that the next time
146 * we're called we'll have more memory. */
147 return -ENOMEM;
148 }
149
150 skb_put(skb, len - 4);
151
152 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
153 if (err < 0) {
154 kfree_skb(skb);
155 return err;
156 }
157
158 data->hdev->stat.byte_rx += len;
159
160 skb->dev = (void *) data->hdev;
161 bt_cb(skb)->pkt_type = hdr[3];
162
163 err = hci_recv_frame(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
172static 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
190static int btsdio_open(struct hci_dev *hdev)
191{
192 struct btsdio_data *data = hdev->driver_data;
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_STAT, NULL);
217
218 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
219
220release:
221 sdio_release_host(data->func);
222
223 return err;
224}
225
226static int btsdio_close(struct hci_dev *hdev)
227{
228 struct btsdio_data *data = hdev->driver_data;
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
247static int btsdio_flush(struct hci_dev *hdev)
248{
249 struct btsdio_data *data = hdev->driver_data;
250
251 BT_DBG("%s", hdev->name);
252
253 skb_queue_purge(&data->txq);
254
255 return 0;
256}
257
258static int btsdio_send_frame(struct sk_buff *skb)
259{
260 struct hci_dev *hdev = (struct hci_dev *) skb->dev;
261 struct btsdio_data *data = hdev->driver_data;
262
263 BT_DBG("%s", hdev->name);
264
265 if (!test_bit(HCI_RUNNING, &hdev->flags))
266 return -EBUSY;
267
268 switch (bt_cb(skb)->pkt_type) {
269 case HCI_COMMAND_PKT:
270 hdev->stat.cmd_tx++;
271 break;
272
273 case HCI_ACLDATA_PKT:
274 hdev->stat.acl_tx++;
275 break;
276
277 case HCI_SCODATA_PKT:
278 hdev->stat.sco_tx++;
279 break;
280
281 default:
282 return -EILSEQ;
283 }
284
285 skb_queue_tail(&data->txq, skb);
286
287 schedule_work(&data->work);
288
289 return 0;
290}
291
292static void btsdio_destruct(struct hci_dev *hdev)
293{
294 struct btsdio_data *data = hdev->driver_data;
295
296 BT_DBG("%s", hdev->name);
297
298 kfree(data);
299}
300
301static int btsdio_probe(struct sdio_func *func,
302 const struct sdio_device_id *id)
303{
304 struct btsdio_data *data;
305 struct hci_dev *hdev;
306 struct sdio_func_tuple *tuple = func->tuples;
307 int err;
308
309 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
310
311 while (tuple) {
312 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
313 tuple = tuple->next;
314 }
315
316 data = kzalloc(sizeof(*data), GFP_KERNEL);
317 if (!data)
318 return -ENOMEM;
319
320 data->func = func;
321
322 INIT_WORK(&data->work, btsdio_work);
323
324 skb_queue_head_init(&data->txq);
325
326 hdev = hci_alloc_dev();
327 if (!hdev) {
328 kfree(data);
329 return -ENOMEM;
330 }
331
332 hdev->bus = HCI_SDIO;
333 hdev->driver_data = data;
334
335 if (id->class == SDIO_CLASS_BT_AMP)
336 hdev->dev_type = HCI_AMP;
337 else
338 hdev->dev_type = HCI_BREDR;
339
340 data->hdev = hdev;
341
342 SET_HCIDEV_DEV(hdev, &func->dev);
343
344 hdev->open = btsdio_open;
345 hdev->close = btsdio_close;
346 hdev->flush = btsdio_flush;
347 hdev->send = btsdio_send_frame;
348 hdev->destruct = btsdio_destruct;
349
350 hdev->owner = THIS_MODULE;
351
352 err = hci_register_dev(hdev);
353 if (err < 0) {
354 hci_free_dev(hdev);
355 kfree(data);
356 return err;
357 }
358
359 sdio_set_drvdata(func, data);
360
361 return 0;
362}
363
364static void btsdio_remove(struct sdio_func *func)
365{
366 struct btsdio_data *data = sdio_get_drvdata(func);
367 struct hci_dev *hdev;
368
369 BT_DBG("func %p", func);
370
371 if (!data)
372 return;
373
374 hdev = data->hdev;
375
376 sdio_set_drvdata(func, NULL);
377
378 hci_unregister_dev(hdev);
379
380 hci_free_dev(hdev);
381}
382
383static struct sdio_driver btsdio_driver = {
384 .name = "btsdio",
385 .probe = btsdio_probe,
386 .remove = btsdio_remove,
387 .id_table = btsdio_table,
388};
389
390static int __init btsdio_init(void)
391{
392 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
393
394 return sdio_register_driver(&btsdio_driver);
395}
396
397static void __exit btsdio_exit(void)
398{
399 sdio_unregister_driver(&btsdio_driver);
400}
401
402module_init(btsdio_init);
403module_exit(btsdio_exit);
404
405MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
406MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
407MODULE_VERSION(VERSION);
408MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Generic Bluetooth SDIO driver
5 *
6 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
7 * Copyright (C) 2007 Marcel Holtmann <marcel@holtmann.org>
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/slab.h>
14#include <linux/types.h>
15#include <linux/sched.h>
16#include <linux/errno.h>
17#include <linux/skbuff.h>
18
19#include <linux/mmc/host.h>
20#include <linux/mmc/sdio_ids.h>
21#include <linux/mmc/sdio_func.h>
22
23#include <net/bluetooth/bluetooth.h>
24#include <net/bluetooth/hci_core.h>
25
26#define VERSION "0.1"
27
28static const struct sdio_device_id btsdio_table[] = {
29 /* Generic Bluetooth Type-A SDIO device */
30 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
31
32 /* Generic Bluetooth Type-B SDIO device */
33 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
34
35 { } /* Terminating entry */
36};
37
38MODULE_DEVICE_TABLE(sdio, btsdio_table);
39
40struct btsdio_data {
41 struct hci_dev *hdev;
42 struct sdio_func *func;
43
44 struct work_struct work;
45
46 struct sk_buff_head txq;
47};
48
49#define REG_RDAT 0x00 /* Receiver Data */
50#define REG_TDAT 0x00 /* Transmitter Data */
51#define REG_PC_RRT 0x10 /* Read Packet Control */
52#define REG_PC_WRT 0x11 /* Write Packet Control */
53#define REG_RTC_STAT 0x12 /* Retry Control Status */
54#define REG_RTC_SET 0x12 /* Retry Control Set */
55#define REG_INTRD 0x13 /* Interrupt Indication */
56#define REG_CL_INTRD 0x13 /* Interrupt Clear */
57#define REG_EN_INTRD 0x14 /* Interrupt Enable */
58#define REG_MD_STAT 0x20 /* Bluetooth Mode Status */
59#define REG_MD_SET 0x20 /* Bluetooth Mode Set */
60
61static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
62{
63 int err;
64
65 BT_DBG("%s", data->hdev->name);
66
67 /* Prepend Type-A header */
68 skb_push(skb, 4);
69 skb->data[0] = (skb->len & 0x0000ff);
70 skb->data[1] = (skb->len & 0x00ff00) >> 8;
71 skb->data[2] = (skb->len & 0xff0000) >> 16;
72 skb->data[3] = hci_skb_pkt_type(skb);
73
74 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
75 if (err < 0) {
76 skb_pull(skb, 4);
77 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
78 return err;
79 }
80
81 data->hdev->stat.byte_tx += skb->len;
82
83 kfree_skb(skb);
84
85 return 0;
86}
87
88static void btsdio_work(struct work_struct *work)
89{
90 struct btsdio_data *data = container_of(work, struct btsdio_data, work);
91 struct sk_buff *skb;
92 int err;
93
94 BT_DBG("%s", data->hdev->name);
95
96 sdio_claim_host(data->func);
97
98 while ((skb = skb_dequeue(&data->txq))) {
99 err = btsdio_tx_packet(data, skb);
100 if (err < 0) {
101 data->hdev->stat.err_tx++;
102 skb_queue_head(&data->txq, skb);
103 break;
104 }
105 }
106
107 sdio_release_host(data->func);
108}
109
110static int btsdio_rx_packet(struct btsdio_data *data)
111{
112 u8 hdr[4] __attribute__ ((aligned(4)));
113 struct sk_buff *skb;
114 int err, len;
115
116 BT_DBG("%s", data->hdev->name);
117
118 err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
119 if (err < 0)
120 return err;
121
122 len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
123 if (len < 4 || len > 65543)
124 return -EILSEQ;
125
126 skb = bt_skb_alloc(len - 4, GFP_KERNEL);
127 if (!skb) {
128 /* Out of memory. Prepare a read retry and just
129 * return with the expectation that the next time
130 * we're called we'll have more memory.
131 */
132 return -ENOMEM;
133 }
134
135 skb_put(skb, len - 4);
136
137 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
138 if (err < 0) {
139 kfree_skb(skb);
140 return err;
141 }
142
143 data->hdev->stat.byte_rx += len;
144
145 switch (hdr[3]) {
146 case HCI_EVENT_PKT:
147 case HCI_ACLDATA_PKT:
148 case HCI_SCODATA_PKT:
149 case HCI_ISODATA_PKT:
150 hci_skb_pkt_type(skb) = hdr[3];
151 err = hci_recv_frame(data->hdev, skb);
152 if (err < 0)
153 return err;
154 break;
155 default:
156 kfree_skb(skb);
157 return -EINVAL;
158 }
159
160 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
161
162 return 0;
163}
164
165static void btsdio_interrupt(struct sdio_func *func)
166{
167 struct btsdio_data *data = sdio_get_drvdata(func);
168 int intrd;
169
170 BT_DBG("%s", data->hdev->name);
171
172 intrd = sdio_readb(func, REG_INTRD, NULL);
173 if (intrd & 0x01) {
174 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
175
176 if (btsdio_rx_packet(data) < 0) {
177 data->hdev->stat.err_rx++;
178 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
179 }
180 }
181}
182
183static int btsdio_open(struct hci_dev *hdev)
184{
185 struct btsdio_data *data = hci_get_drvdata(hdev);
186 int err;
187
188 BT_DBG("%s", hdev->name);
189
190 sdio_claim_host(data->func);
191
192 err = sdio_enable_func(data->func);
193 if (err < 0)
194 goto release;
195
196 err = sdio_claim_irq(data->func, btsdio_interrupt);
197 if (err < 0) {
198 sdio_disable_func(data->func);
199 goto release;
200 }
201
202 if (data->func->class == SDIO_CLASS_BT_B)
203 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
204
205 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
206
207release:
208 sdio_release_host(data->func);
209
210 return err;
211}
212
213static int btsdio_close(struct hci_dev *hdev)
214{
215 struct btsdio_data *data = hci_get_drvdata(hdev);
216
217 BT_DBG("%s", hdev->name);
218
219 sdio_claim_host(data->func);
220
221 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
222
223 sdio_release_irq(data->func);
224 sdio_disable_func(data->func);
225
226 sdio_release_host(data->func);
227
228 return 0;
229}
230
231static int btsdio_flush(struct hci_dev *hdev)
232{
233 struct btsdio_data *data = hci_get_drvdata(hdev);
234
235 BT_DBG("%s", hdev->name);
236
237 skb_queue_purge(&data->txq);
238
239 return 0;
240}
241
242static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
243{
244 struct btsdio_data *data = hci_get_drvdata(hdev);
245
246 BT_DBG("%s", hdev->name);
247
248 switch (hci_skb_pkt_type(skb)) {
249 case HCI_COMMAND_PKT:
250 hdev->stat.cmd_tx++;
251 break;
252
253 case HCI_ACLDATA_PKT:
254 hdev->stat.acl_tx++;
255 break;
256
257 case HCI_SCODATA_PKT:
258 hdev->stat.sco_tx++;
259 break;
260
261 default:
262 return -EILSEQ;
263 }
264
265 skb_queue_tail(&data->txq, skb);
266
267 schedule_work(&data->work);
268
269 return 0;
270}
271
272static int btsdio_probe(struct sdio_func *func,
273 const struct sdio_device_id *id)
274{
275 struct btsdio_data *data;
276 struct hci_dev *hdev;
277 struct sdio_func_tuple *tuple = func->tuples;
278 int err;
279
280 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
281
282 while (tuple) {
283 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
284 tuple = tuple->next;
285 }
286
287 /* Broadcom devices soldered onto the PCB (non-removable) use an
288 * UART connection for Bluetooth, ignore the BT SDIO interface.
289 */
290 if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&
291 !mmc_card_is_removable(func->card->host)) {
292 switch (func->device) {
293 case SDIO_DEVICE_ID_BROADCOM_43341:
294 case SDIO_DEVICE_ID_BROADCOM_43430:
295 case SDIO_DEVICE_ID_BROADCOM_4345:
296 case SDIO_DEVICE_ID_BROADCOM_43455:
297 case SDIO_DEVICE_ID_BROADCOM_4356:
298 return -ENODEV;
299 }
300 }
301
302 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
303 if (!data)
304 return -ENOMEM;
305
306 data->func = func;
307
308 INIT_WORK(&data->work, btsdio_work);
309
310 skb_queue_head_init(&data->txq);
311
312 hdev = hci_alloc_dev();
313 if (!hdev)
314 return -ENOMEM;
315
316 hdev->bus = HCI_SDIO;
317 hci_set_drvdata(hdev, data);
318
319 data->hdev = hdev;
320
321 SET_HCIDEV_DEV(hdev, &func->dev);
322
323 hdev->open = btsdio_open;
324 hdev->close = btsdio_close;
325 hdev->flush = btsdio_flush;
326 hdev->send = btsdio_send_frame;
327
328 if (func->vendor == 0x0104 && func->device == 0x00c5)
329 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
330
331 err = hci_register_dev(hdev);
332 if (err < 0) {
333 hci_free_dev(hdev);
334 return err;
335 }
336
337 sdio_set_drvdata(func, data);
338
339 return 0;
340}
341
342static void btsdio_remove(struct sdio_func *func)
343{
344 struct btsdio_data *data = sdio_get_drvdata(func);
345 struct hci_dev *hdev;
346
347 BT_DBG("func %p", func);
348
349 if (!data)
350 return;
351
352 cancel_work_sync(&data->work);
353 hdev = data->hdev;
354
355 sdio_set_drvdata(func, NULL);
356
357 hci_unregister_dev(hdev);
358
359 hci_free_dev(hdev);
360}
361
362static struct sdio_driver btsdio_driver = {
363 .name = "btsdio",
364 .probe = btsdio_probe,
365 .remove = btsdio_remove,
366 .id_table = btsdio_table,
367};
368
369module_sdio_driver(btsdio_driver);
370
371MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
372MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
373MODULE_VERSION(VERSION);
374MODULE_LICENSE("GPL");