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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
45 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
46
47
48 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
49
50
51 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) },
52
53 { }
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
68#define REG_TDAT 0x00
69#define REG_PC_RRT 0x10
70#define REG_PC_WRT 0x11
71#define REG_RTC_STAT 0x12
72#define REG_RTC_SET 0x12
73#define REG_INTRD 0x13
74#define REG_CL_INTRD 0x13
75#define REG_EN_INTRD 0x14
76#define REG_MD_STAT 0x20
77#define REG_MD_SET 0x20
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
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
147
148
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
297
298
299 if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&
300 func->device == SDIO_DEVICE_ID_BROADCOM_43341 &&
301 !mmc_card_is_removable(func->card->host))
302 return -ENODEV;
303
304 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
305 if (!data)
306 return -ENOMEM;
307
308 data->func = func;
309
310 INIT_WORK(&data->work, btsdio_work);
311
312 skb_queue_head_init(&data->txq);
313
314 hdev = hci_alloc_dev();
315 if (!hdev)
316 return -ENOMEM;
317
318 hdev->bus = HCI_SDIO;
319 hci_set_drvdata(hdev, data);
320
321 if (id->class == SDIO_CLASS_BT_AMP)
322 hdev->dev_type = HCI_AMP;
323 else
324 hdev->dev_type = HCI_PRIMARY;
325
326 data->hdev = hdev;
327
328 SET_HCIDEV_DEV(hdev, &func->dev);
329
330 hdev->open = btsdio_open;
331 hdev->close = btsdio_close;
332 hdev->flush = btsdio_flush;
333 hdev->send = btsdio_send_frame;
334
335 if (func->vendor == 0x0104 && func->device == 0x00c5)
336 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
337
338 err = hci_register_dev(hdev);
339 if (err < 0) {
340 hci_free_dev(hdev);
341 return err;
342 }
343
344 sdio_set_drvdata(func, data);
345
346 return 0;
347}
348
349static void btsdio_remove(struct sdio_func *func)
350{
351 struct btsdio_data *data = sdio_get_drvdata(func);
352 struct hci_dev *hdev;
353
354 BT_DBG("func %p", func);
355
356 if (!data)
357 return;
358
359 hdev = data->hdev;
360
361 sdio_set_drvdata(func, NULL);
362
363 hci_unregister_dev(hdev);
364
365 hci_free_dev(hdev);
366}
367
368static struct sdio_driver btsdio_driver = {
369 .name = "btsdio",
370 .probe = btsdio_probe,
371 .remove = btsdio_remove,
372 .id_table = btsdio_table,
373};
374
375static int __init btsdio_init(void)
376{
377 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
378
379 return sdio_register_driver(&btsdio_driver);
380}
381
382static void __exit btsdio_exit(void)
383{
384 sdio_unregister_driver(&btsdio_driver);
385}
386
387module_init(btsdio_init);
388module_exit(btsdio_exit);
389
390MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
391MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
392MODULE_VERSION(VERSION);
393MODULE_LICENSE("GPL");
394
