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, len: 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(func: data->func, REG_TDAT, src: skb->data, count: skb->len);
75 if (err < 0) {
76 skb_pull(skb, len: 4);
77 sdio_writeb(func: data->func, b: 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(func: data->func);
97
98 while ((skb = skb_dequeue(list: &data->txq))) {
99 err = btsdio_tx_packet(data, skb);
100 if (err < 0) {
101 data->hdev->stat.err_tx++;
102 skb_queue_head(list: &data->txq, newsk: skb);
103 break;
104 }
105 }
106
107 sdio_release_host(func: 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(func: data->func, dst: hdr, REG_RDAT, count: 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: 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: len - 4);
136
137 err = sdio_readsb(func: data->func, dst: skb->data, REG_RDAT, count: 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(hdev: 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(func: data->func, b: 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, b: 0x01, REG_CL_INTRD, NULL);
175
176 if (btsdio_rx_packet(data) < 0) {
177 data->hdev->stat.err_rx++;
178 sdio_writeb(func: data->func, b: 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(func: data->func);
191
192 err = sdio_enable_func(func: data->func);
193 if (err < 0)
194 goto release;
195
196 err = sdio_claim_irq(func: data->func, handler: btsdio_interrupt);
197 if (err < 0) {
198 sdio_disable_func(func: data->func);
199 goto release;
200 }
201
202 if (data->func->class == SDIO_CLASS_BT_B)
203 sdio_writeb(func: data->func, b: 0x00, REG_MD_SET, NULL);
204
205 sdio_writeb(func: data->func, b: 0x01, REG_EN_INTRD, NULL);
206
207release:
208 sdio_release_host(func: 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(func: data->func);
220
221 sdio_writeb(func: data->func, b: 0x00, REG_EN_INTRD, NULL);
222
223 sdio_release_irq(func: data->func);
224 sdio_disable_func(func: data->func);
225
226 sdio_release_host(func: 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(list: &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(list: &data->txq, newsk: skb);
266
267 schedule_work(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(host: 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 case SDIO_DEVICE_ID_BROADCOM_CYPRESS_4373:
299 return -ENODEV;
300 }
301 }
302
303 data = devm_kzalloc(dev: &func->dev, size: 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(list: &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 data->hdev = hdev;
321
322 SET_HCIDEV_DEV(hdev, &func->dev);
323
324 hdev->open = btsdio_open;
325 hdev->close = btsdio_close;
326 hdev->flush = btsdio_flush;
327 hdev->send = btsdio_send_frame;
328
329 if (func->vendor == 0x0104 && func->device == 0x00c5)
330 hci_set_quirk(hdev, HCI_QUIRK_RESET_ON_CLOSE);
331
332 err = hci_register_dev(hdev);
333 if (err < 0) {
334 hci_free_dev(hdev);
335 return err;
336 }
337
338 sdio_set_drvdata(func, data);
339
340 return 0;
341}
342
343static void btsdio_remove(struct sdio_func *func)
344{
345 struct btsdio_data *data = sdio_get_drvdata(func);
346 struct hci_dev *hdev;
347
348 BT_DBG("func %p", func);
349
350 if (!data)
351 return;
352
353 cancel_work_sync(work: &data->work);
354 hdev = data->hdev;
355
356 sdio_set_drvdata(func, NULL);
357
358 hci_unregister_dev(hdev);
359
360 hci_free_dev(hdev);
361}
362
363static struct sdio_driver btsdio_driver = {
364 .name = "btsdio",
365 .probe = btsdio_probe,
366 .remove = btsdio_remove,
367 .id_table = btsdio_table,
368};
369
370module_sdio_driver(btsdio_driver);
371
372MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
373MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
374MODULE_VERSION(VERSION);
375MODULE_LICENSE("GPL");
376

source code of linux/drivers/bluetooth/btsdio.c