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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#define REG_MD_SET 0x20
77
78static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
79{
80 int err;
81
82 BT_DBG("%s", data->hdev->name);
83
84
85 skb_push(skb, 4);
86 skb->data[0] = (skb->len & 0x0000ff);
87 skb->data[1] = (skb->len & 0x00ff00) >> 8;
88 skb->data[2] = (skb->len & 0xff0000) >> 16;
89 skb->data[3] = hci_skb_pkt_type(skb);
90
91 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
92 if (err < 0) {
93 skb_pull(skb, 4);
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 hci_skb_pkt_type(skb) = hdr[3];
162
163 err = hci_recv_frame(data->hdev, 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 sdio_claim_host(data->func);
198
199 err = sdio_enable_func(data->func);
200 if (err < 0)
201 goto release;
202
203 err = sdio_claim_irq(data->func, btsdio_interrupt);
204 if (err < 0) {
205 sdio_disable_func(data->func);
206 goto release;
207 }
208
209 if (data->func->class == SDIO_CLASS_BT_B)
210 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
211
212 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
213
214release:
215 sdio_release_host(data->func);
216
217 return err;
218}
219
220static int btsdio_close(struct hci_dev *hdev)
221{
222 struct btsdio_data *data = hci_get_drvdata(hdev);
223
224 BT_DBG("%s", hdev->name);
225
226 sdio_claim_host(data->func);
227
228 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
229
230 sdio_release_irq(data->func);
231 sdio_disable_func(data->func);
232
233 sdio_release_host(data->func);
234
235 return 0;
236}
237
238static int btsdio_flush(struct hci_dev *hdev)
239{
240 struct btsdio_data *data = hci_get_drvdata(hdev);
241
242 BT_DBG("%s", hdev->name);
243
244 skb_queue_purge(&data->txq);
245
246 return 0;
247}
248
249static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
250{
251 struct btsdio_data *data = hci_get_drvdata(hdev);
252
253 BT_DBG("%s", hdev->name);
254
255 switch (hci_skb_pkt_type(skb)) {
256 case HCI_COMMAND_PKT:
257 hdev->stat.cmd_tx++;
258 break;
259
260 case HCI_ACLDATA_PKT:
261 hdev->stat.acl_tx++;
262 break;
263
264 case HCI_SCODATA_PKT:
265 hdev->stat.sco_tx++;
266 break;
267
268 default:
269 return -EILSEQ;
270 }
271
272 skb_queue_tail(&data->txq, skb);
273
274 schedule_work(&data->work);
275
276 return 0;
277}
278
279static int btsdio_probe(struct sdio_func *func,
280 const struct sdio_device_id *id)
281{
282 struct btsdio_data *data;
283 struct hci_dev *hdev;
284 struct sdio_func_tuple *tuple = func->tuples;
285 int err;
286
287 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
288
289 while (tuple) {
290 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
291 tuple = tuple->next;
292 }
293
294 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
295 if (!data)
296 return -ENOMEM;
297
298 data->func = func;
299
300 INIT_WORK(&data->work, btsdio_work);
301
302 skb_queue_head_init(&data->txq);
303
304 hdev = hci_alloc_dev();
305 if (!hdev)
306 return -ENOMEM;
307
308 hdev->bus = HCI_SDIO;
309 hci_set_drvdata(hdev, data);
310
311 if (id->class == SDIO_CLASS_BT_AMP)
312 hdev->dev_type = HCI_AMP;
313 else
314 hdev->dev_type = HCI_PRIMARY;
315
316 data->hdev = hdev;
317
318 SET_HCIDEV_DEV(hdev, &func->dev);
319
320 hdev->open = btsdio_open;
321 hdev->close = btsdio_close;
322 hdev->flush = btsdio_flush;
323 hdev->send = btsdio_send_frame;
324
325 if (func->vendor == 0x0104 && func->device == 0x00c5)
326 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
327
328 err = hci_register_dev(hdev);
329 if (err < 0) {
330 hci_free_dev(hdev);
331 return err;
332 }
333
334 sdio_set_drvdata(func, data);
335
336 return 0;
337}
338
339static void btsdio_remove(struct sdio_func *func)
340{
341 struct btsdio_data *data = sdio_get_drvdata(func);
342 struct hci_dev *hdev;
343
344 BT_DBG("func %p", func);
345
346 if (!data)
347 return;
348
349 hdev = data->hdev;
350
351 sdio_set_drvdata(func, NULL);
352
353 hci_unregister_dev(hdev);
354
355 hci_free_dev(hdev);
356}
357
358static struct sdio_driver btsdio_driver = {
359 .name = "btsdio",
360 .probe = btsdio_probe,
361 .remove = btsdio_remove,
362 .id_table = btsdio_table,
363};
364
365static int __init btsdio_init(void)
366{
367 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
368
369 return sdio_register_driver(&btsdio_driver);
370}
371
372static void __exit btsdio_exit(void)
373{
374 sdio_unregister_driver(&btsdio_driver);
375}
376
377module_init(btsdio_init);
378module_exit(btsdio_exit);
379
380MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
381MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
382MODULE_VERSION(VERSION);
383MODULE_LICENSE("GPL");
384
