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