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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/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#ifndef CONFIG_BT_HCIBTSDIO_DEBUG
41#undef BT_DBG
42#define BT_DBG(D...)
43#endif
44
45#define VERSION "0.1"
46
47static const struct sdio_device_id btsdio_table[] = {
48
49 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
50
51
52 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
53
54 { }
55};
56
57MODULE_DEVICE_TABLE(sdio, btsdio_table);
58
59struct btsdio_data {
60 struct hci_dev *hdev;
61 struct sdio_func *func;
62
63 struct work_struct work;
64
65 struct sk_buff_head txq;
66};
67
68#define REG_RDAT 0x00
69#define REG_TDAT 0x00
70#define REG_PC_RRT 0x10
71#define REG_PC_WRT 0x11
72#define REG_RTC_STAT 0x12
73#define REG_RTC_SET 0x12
74#define REG_INTRD 0x13
75#define REG_CL_INTRD 0x13
76#define REG_EN_INTRD 0x14
77#define REG_MD_STAT 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] = bt_cb(skb)->pkt_type;
91
92 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
93 if (err < 0) {
94 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
95 return err;
96 }
97
98 data->hdev->stat.byte_tx += skb->len;
99
100 kfree_skb(skb);
101
102 return 0;
103}
104
105static void btsdio_work(struct work_struct *work)
106{
107 struct btsdio_data *data = container_of(work, struct btsdio_data, work);
108 struct sk_buff *skb;
109 int err;
110
111 BT_DBG("%s", data->hdev->name);
112
113 sdio_claim_host(data->func);
114
115 while ((skb = skb_dequeue(&data->txq))) {
116 err = btsdio_tx_packet(data, skb);
117 if (err < 0) {
118 data->hdev->stat.err_tx++;
119 skb_queue_head(&data->txq, skb);
120 break;
121 }
122 }
123
124 sdio_release_host(data->func);
125}
126
127static int btsdio_rx_packet(struct btsdio_data *data)
128{
129 u8 hdr[4] __attribute__ ((aligned(4)));
130 struct sk_buff *skb;
131 int err, len;
132
133 BT_DBG("%s", data->hdev->name);
134
135 err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
136 if (err < 0)
137 return err;
138
139 len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
140 if (len < 4 || len > 65543)
141 return -EILSEQ;
142
143 skb = bt_skb_alloc(len - 4, GFP_KERNEL);
144 if (!skb) {
145
146
147
148 return -ENOMEM;
149 }
150
151 skb_put(skb, len - 4);
152
153 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
154 if (err < 0) {
155 kfree_skb(skb);
156 return err;
157 }
158
159 data->hdev->stat.byte_rx += len;
160
161 skb->dev = (void *) data->hdev;
162 bt_cb(skb)->pkt_type = hdr[3];
163
164 err = hci_recv_frame(skb);
165 if (err < 0)
166 return err;
167
168 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
169
170 return 0;
171}
172
173static void btsdio_interrupt(struct sdio_func *func)
174{
175 struct btsdio_data *data = sdio_get_drvdata(func);
176 int intrd;
177
178 BT_DBG("%s", data->hdev->name);
179
180 intrd = sdio_readb(func, REG_INTRD, NULL);
181 if (intrd & 0x01) {
182 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
183
184 if (btsdio_rx_packet(data) < 0) {
185 data->hdev->stat.err_rx++;
186 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
187 }
188 }
189}
190
191static int btsdio_open(struct hci_dev *hdev)
192{
193 struct btsdio_data *data = hdev->driver_data;
194 int err;
195
196 BT_DBG("%s", hdev->name);
197
198 if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
199 return 0;
200
201 sdio_claim_host(data->func);
202
203 err = sdio_enable_func(data->func);
204 if (err < 0) {
205 clear_bit(HCI_RUNNING, &hdev->flags);
206 goto release;
207 }
208
209 err = sdio_claim_irq(data->func, btsdio_interrupt);
210 if (err < 0) {
211 sdio_disable_func(data->func);
212 clear_bit(HCI_RUNNING, &hdev->flags);
213 goto release;
214 }
215
216 if (data->func->class == SDIO_CLASS_BT_B)
217 sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL);
218
219 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
220
221release:
222 sdio_release_host(data->func);
223
224 return err;
225}
226
227static int btsdio_close(struct hci_dev *hdev)
228{
229 struct btsdio_data *data = hdev->driver_data;
230
231 BT_DBG("%s", hdev->name);
232
233 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
234 return 0;
235
236 sdio_claim_host(data->func);
237
238 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
239
240 sdio_release_irq(data->func);
241 sdio_disable_func(data->func);
242
243 sdio_release_host(data->func);
244
245 return 0;
246}
247
248static int btsdio_flush(struct hci_dev *hdev)
249{
250 struct btsdio_data *data = hdev->driver_data;
251
252 BT_DBG("%s", hdev->name);
253
254 skb_queue_purge(&data->txq);
255
256 return 0;
257}
258
259static int btsdio_send_frame(struct sk_buff *skb)
260{
261 struct hci_dev *hdev = (struct hci_dev *) skb->dev;
262 struct btsdio_data *data = hdev->driver_data;
263
264 BT_DBG("%s", hdev->name);
265
266 if (!test_bit(HCI_RUNNING, &hdev->flags))
267 return -EBUSY;
268
269 switch (bt_cb(skb)->pkt_type) {
270 case HCI_COMMAND_PKT:
271 hdev->stat.cmd_tx++;
272 break;
273
274 case HCI_ACLDATA_PKT:
275 hdev->stat.acl_tx++;
276 break;
277
278 case HCI_SCODATA_PKT:
279 hdev->stat.sco_tx++;
280 break;
281
282 default:
283 return -EILSEQ;
284 }
285
286 skb_queue_tail(&data->txq, skb);
287
288 schedule_work(&data->work);
289
290 return 0;
291}
292
293static void btsdio_destruct(struct hci_dev *hdev)
294{
295 struct btsdio_data *data = hdev->driver_data;
296
297 BT_DBG("%s", hdev->name);
298
299 kfree(data);
300}
301
302static int btsdio_probe(struct sdio_func *func,
303 const struct sdio_device_id *id)
304{
305 struct btsdio_data *data;
306 struct hci_dev *hdev;
307 struct sdio_func_tuple *tuple = func->tuples;
308 int err;
309
310 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
311
312 while (tuple) {
313 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
314 tuple = tuple->next;
315 }
316
317 data = kzalloc(sizeof(*data), GFP_KERNEL);
318 if (!data)
319 return -ENOMEM;
320
321 data->func = func;
322
323 INIT_WORK(&data->work, btsdio_work);
324
325 skb_queue_head_init(&data->txq);
326
327 hdev = hci_alloc_dev();
328 if (!hdev) {
329 kfree(data);
330 return -ENOMEM;
331 }
332
333 hdev->type = HCI_SDIO;
334 hdev->driver_data = data;
335
336 data->hdev = hdev;
337
338 SET_HCIDEV_DEV(hdev, &func->dev);
339
340 hdev->open = btsdio_open;
341 hdev->close = btsdio_close;
342 hdev->flush = btsdio_flush;
343 hdev->send = btsdio_send_frame;
344 hdev->destruct = btsdio_destruct;
345
346 hdev->owner = THIS_MODULE;
347
348 err = hci_register_dev(hdev);
349 if (err < 0) {
350 hci_free_dev(hdev);
351 kfree(data);
352 return err;
353 }
354
355 sdio_set_drvdata(func, data);
356
357 return 0;
358}
359
360static void btsdio_remove(struct sdio_func *func)
361{
362 struct btsdio_data *data = sdio_get_drvdata(func);
363 struct hci_dev *hdev;
364
365 BT_DBG("func %p", func);
366
367 if (!data)
368 return;
369
370 hdev = data->hdev;
371
372 sdio_set_drvdata(func, NULL);
373
374 hci_unregister_dev(hdev);
375
376 hci_free_dev(hdev);
377}
378
379static struct sdio_driver btsdio_driver = {
380 .name = "btsdio",
381 .probe = btsdio_probe,
382 .remove = btsdio_remove,
383 .id_table = btsdio_table,
384};
385
386static int __init btsdio_init(void)
387{
388 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
389
390 return sdio_register_driver(&btsdio_driver);
391}
392
393static void __exit btsdio_exit(void)
394{
395 sdio_unregister_driver(&btsdio_driver);
396}
397
398module_init(btsdio_init);
399module_exit(btsdio_exit);
400
401MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
402MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
403MODULE_VERSION(VERSION);
404MODULE_LICENSE("GPL");
405
