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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#define VERSION "0.1"
41
42static const struct sdio_device_id btsdio_table[] = {
43
44 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
45
46
47 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
48
49
50 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) },
51
52 { }
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
67#define REG_TDAT 0x00
68#define REG_PC_RRT 0x10
69#define REG_PC_WRT 0x11
70#define REG_RTC_STAT 0x12
71#define REG_RTC_SET 0x12
72#define REG_INTRD 0x13
73#define REG_CL_INTRD 0x13
74#define REG_EN_INTRD 0x14
75#define REG_MD_STAT 0x20
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
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
145
146
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 = hci_get_drvdata(hdev);
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 = hci_get_drvdata(hdev);
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 = hci_get_drvdata(hdev);
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 = hci_get_drvdata(hdev);
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 int btsdio_probe(struct sdio_func *func,
293 const struct sdio_device_id *id)
294{
295 struct btsdio_data *data;
296 struct hci_dev *hdev;
297 struct sdio_func_tuple *tuple = func->tuples;
298 int err;
299
300 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
301
302 while (tuple) {
303 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
304 tuple = tuple->next;
305 }
306
307 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
308 if (!data)
309 return -ENOMEM;
310
311 data->func = func;
312
313 INIT_WORK(&data->work, btsdio_work);
314
315 skb_queue_head_init(&data->txq);
316
317 hdev = hci_alloc_dev();
318 if (!hdev)
319 return -ENOMEM;
320
321 hdev->bus = HCI_SDIO;
322 hci_set_drvdata(hdev, data);
323
324 if (id->class == SDIO_CLASS_BT_AMP)
325 hdev->dev_type = HCI_AMP;
326 else
327 hdev->dev_type = HCI_BREDR;
328
329 data->hdev = hdev;
330
331 SET_HCIDEV_DEV(hdev, &func->dev);
332
333 hdev->open = btsdio_open;
334 hdev->close = btsdio_close;
335 hdev->flush = btsdio_flush;
336 hdev->send = btsdio_send_frame;
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
