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ddbaf13e MH |
1 | /* |
2 | * | |
3 | * Generic Bluetooth SDIO driver | |
4 | * | |
5 | * Copyright (C) 2007 Cambridge Silicon Radio Ltd. | |
6 | * Copyright (C) 2007 Marcel Holtmann <marcel@holtmann.org> | |
7 | * | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | */ | |
24 | ||
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 | ||
ddbaf13e MH |
40 | #define VERSION "0.1" |
41 | ||
42 | static const struct sdio_device_id btsdio_table[] = { | |
43 | /* Generic Bluetooth Type-A SDIO device */ | |
44 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) }, | |
45 | ||
46 | /* Generic Bluetooth Type-B SDIO device */ | |
47 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) }, | |
48 | ||
49 | { } /* Terminating entry */ | |
50 | }; | |
51 | ||
52 | MODULE_DEVICE_TABLE(sdio, btsdio_table); | |
53 | ||
54 | struct btsdio_data { | |
55 | struct hci_dev *hdev; | |
56 | struct sdio_func *func; | |
57 | ||
58 | struct work_struct work; | |
59 | ||
60 | struct sk_buff_head txq; | |
61 | }; | |
62 | ||
63 | #define REG_RDAT 0x00 /* Receiver Data */ | |
64 | #define REG_TDAT 0x00 /* Transmitter Data */ | |
65 | #define REG_PC_RRT 0x10 /* Read Packet Control */ | |
66 | #define REG_PC_WRT 0x11 /* Write Packet Control */ | |
67 | #define REG_RTC_STAT 0x12 /* Retry Control Status */ | |
68 | #define REG_RTC_SET 0x12 /* Retry Control Set */ | |
69 | #define REG_INTRD 0x13 /* Interrupt Indication */ | |
70 | #define REG_CL_INTRD 0x13 /* Interrupt Clear */ | |
71 | #define REG_EN_INTRD 0x14 /* Interrupt Enable */ | |
72 | #define REG_MD_STAT 0x20 /* Bluetooth Mode Status */ | |
73 | ||
74 | static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb) | |
75 | { | |
76 | int err; | |
77 | ||
78 | BT_DBG("%s", data->hdev->name); | |
79 | ||
80 | /* Prepend Type-A header */ | |
81 | skb_push(skb, 4); | |
82 | skb->data[0] = (skb->len & 0x0000ff); | |
83 | skb->data[1] = (skb->len & 0x00ff00) >> 8; | |
84 | skb->data[2] = (skb->len & 0xff0000) >> 16; | |
85 | skb->data[3] = bt_cb(skb)->pkt_type; | |
86 | ||
87 | err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len); | |
88 | if (err < 0) { | |
7644d63d | 89 | skb_pull(skb, 4); |
ddbaf13e MH |
90 | sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL); |
91 | return err; | |
92 | } | |
93 | ||
94 | data->hdev->stat.byte_tx += skb->len; | |
95 | ||
96 | kfree_skb(skb); | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | static void btsdio_work(struct work_struct *work) | |
102 | { | |
103 | struct btsdio_data *data = container_of(work, struct btsdio_data, work); | |
104 | struct sk_buff *skb; | |
105 | int err; | |
106 | ||
107 | BT_DBG("%s", data->hdev->name); | |
108 | ||
109 | sdio_claim_host(data->func); | |
110 | ||
111 | while ((skb = skb_dequeue(&data->txq))) { | |
112 | err = btsdio_tx_packet(data, skb); | |
113 | if (err < 0) { | |
114 | data->hdev->stat.err_tx++; | |
115 | skb_queue_head(&data->txq, skb); | |
116 | break; | |
117 | } | |
118 | } | |
119 | ||
120 | sdio_release_host(data->func); | |
121 | } | |
122 | ||
123 | static int btsdio_rx_packet(struct btsdio_data *data) | |
124 | { | |
125 | u8 hdr[4] __attribute__ ((aligned(4))); | |
126 | struct sk_buff *skb; | |
127 | int err, len; | |
128 | ||
129 | BT_DBG("%s", data->hdev->name); | |
130 | ||
131 | err = sdio_readsb(data->func, hdr, REG_RDAT, 4); | |
132 | if (err < 0) | |
133 | return err; | |
134 | ||
135 | len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16); | |
136 | if (len < 4 || len > 65543) | |
137 | return -EILSEQ; | |
138 | ||
139 | skb = bt_skb_alloc(len - 4, GFP_KERNEL); | |
140 | if (!skb) { | |
141 | /* Out of memory. Prepare a read retry and just | |
142 | * return with the expectation that the next time | |
143 | * we're called we'll have more memory. */ | |
144 | return -ENOMEM; | |
145 | } | |
146 | ||
147 | skb_put(skb, len - 4); | |
148 | ||
149 | err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4); | |
150 | if (err < 0) { | |
cbfd24a7 | 151 | kfree_skb(skb); |
ddbaf13e MH |
152 | return err; |
153 | } | |
154 | ||
155 | data->hdev->stat.byte_rx += len; | |
156 | ||
157 | skb->dev = (void *) data->hdev; | |
158 | bt_cb(skb)->pkt_type = hdr[3]; | |
159 | ||
160 | err = hci_recv_frame(skb); | |
2fa99342 | 161 | if (err < 0) |
ddbaf13e | 162 | return err; |
ddbaf13e MH |
163 | |
164 | sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | static void btsdio_interrupt(struct sdio_func *func) | |
170 | { | |
171 | struct btsdio_data *data = sdio_get_drvdata(func); | |
172 | int intrd; | |
173 | ||
174 | BT_DBG("%s", data->hdev->name); | |
175 | ||
176 | intrd = sdio_readb(func, REG_INTRD, NULL); | |
177 | if (intrd & 0x01) { | |
178 | sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); | |
179 | ||
180 | if (btsdio_rx_packet(data) < 0) { | |
181 | data->hdev->stat.err_rx++; | |
182 | sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); | |
183 | } | |
184 | } | |
185 | } | |
186 | ||
187 | static int btsdio_open(struct hci_dev *hdev) | |
188 | { | |
189 | struct btsdio_data *data = hdev->driver_data; | |
190 | int err; | |
191 | ||
192 | BT_DBG("%s", hdev->name); | |
193 | ||
194 | if (test_and_set_bit(HCI_RUNNING, &hdev->flags)) | |
195 | return 0; | |
196 | ||
197 | sdio_claim_host(data->func); | |
198 | ||
199 | err = sdio_enable_func(data->func); | |
200 | if (err < 0) { | |
201 | clear_bit(HCI_RUNNING, &hdev->flags); | |
202 | goto release; | |
203 | } | |
204 | ||
205 | err = sdio_claim_irq(data->func, btsdio_interrupt); | |
206 | if (err < 0) { | |
207 | sdio_disable_func(data->func); | |
208 | clear_bit(HCI_RUNNING, &hdev->flags); | |
209 | goto release; | |
210 | } | |
211 | ||
212 | if (data->func->class == SDIO_CLASS_BT_B) | |
213 | sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL); | |
214 | ||
215 | sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); | |
216 | ||
217 | release: | |
218 | sdio_release_host(data->func); | |
219 | ||
220 | return err; | |
221 | } | |
222 | ||
223 | static int btsdio_close(struct hci_dev *hdev) | |
224 | { | |
225 | struct btsdio_data *data = hdev->driver_data; | |
226 | ||
227 | BT_DBG("%s", hdev->name); | |
228 | ||
229 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) | |
230 | return 0; | |
231 | ||
232 | sdio_claim_host(data->func); | |
233 | ||
234 | sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); | |
235 | ||
236 | sdio_release_irq(data->func); | |
237 | sdio_disable_func(data->func); | |
238 | ||
239 | sdio_release_host(data->func); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static int btsdio_flush(struct hci_dev *hdev) | |
245 | { | |
246 | struct btsdio_data *data = hdev->driver_data; | |
247 | ||
248 | BT_DBG("%s", hdev->name); | |
249 | ||
250 | skb_queue_purge(&data->txq); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static int btsdio_send_frame(struct sk_buff *skb) | |
256 | { | |
257 | struct hci_dev *hdev = (struct hci_dev *) skb->dev; | |
258 | struct btsdio_data *data = hdev->driver_data; | |
259 | ||
260 | BT_DBG("%s", hdev->name); | |
261 | ||
262 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
263 | return -EBUSY; | |
264 | ||
265 | switch (bt_cb(skb)->pkt_type) { | |
266 | case HCI_COMMAND_PKT: | |
267 | hdev->stat.cmd_tx++; | |
268 | break; | |
269 | ||
270 | case HCI_ACLDATA_PKT: | |
271 | hdev->stat.acl_tx++; | |
272 | break; | |
273 | ||
274 | case HCI_SCODATA_PKT: | |
275 | hdev->stat.sco_tx++; | |
276 | break; | |
277 | ||
278 | default: | |
279 | return -EILSEQ; | |
280 | } | |
281 | ||
282 | skb_queue_tail(&data->txq, skb); | |
283 | ||
284 | schedule_work(&data->work); | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
289 | static void btsdio_destruct(struct hci_dev *hdev) | |
290 | { | |
291 | struct btsdio_data *data = hdev->driver_data; | |
292 | ||
293 | BT_DBG("%s", hdev->name); | |
294 | ||
295 | kfree(data); | |
296 | } | |
297 | ||
298 | static int btsdio_probe(struct sdio_func *func, | |
299 | const struct sdio_device_id *id) | |
300 | { | |
301 | struct btsdio_data *data; | |
302 | struct hci_dev *hdev; | |
303 | struct sdio_func_tuple *tuple = func->tuples; | |
304 | int err; | |
305 | ||
306 | BT_DBG("func %p id %p class 0x%04x", func, id, func->class); | |
307 | ||
308 | while (tuple) { | |
309 | BT_DBG("code 0x%x size %d", tuple->code, tuple->size); | |
310 | tuple = tuple->next; | |
311 | } | |
312 | ||
313 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
314 | if (!data) | |
315 | return -ENOMEM; | |
316 | ||
317 | data->func = func; | |
318 | ||
319 | INIT_WORK(&data->work, btsdio_work); | |
320 | ||
321 | skb_queue_head_init(&data->txq); | |
322 | ||
323 | hdev = hci_alloc_dev(); | |
324 | if (!hdev) { | |
325 | kfree(data); | |
326 | return -ENOMEM; | |
327 | } | |
328 | ||
c13854ce | 329 | hdev->bus = HCI_SDIO; |
ddbaf13e MH |
330 | hdev->driver_data = data; |
331 | ||
332 | data->hdev = hdev; | |
333 | ||
334 | SET_HCIDEV_DEV(hdev, &func->dev); | |
335 | ||
336 | hdev->open = btsdio_open; | |
337 | hdev->close = btsdio_close; | |
338 | hdev->flush = btsdio_flush; | |
339 | hdev->send = btsdio_send_frame; | |
340 | hdev->destruct = btsdio_destruct; | |
341 | ||
342 | hdev->owner = THIS_MODULE; | |
343 | ||
344 | err = hci_register_dev(hdev); | |
345 | if (err < 0) { | |
346 | hci_free_dev(hdev); | |
347 | kfree(data); | |
348 | return err; | |
349 | } | |
350 | ||
351 | sdio_set_drvdata(func, data); | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | static void btsdio_remove(struct sdio_func *func) | |
357 | { | |
358 | struct btsdio_data *data = sdio_get_drvdata(func); | |
359 | struct hci_dev *hdev; | |
360 | ||
361 | BT_DBG("func %p", func); | |
362 | ||
363 | if (!data) | |
364 | return; | |
365 | ||
366 | hdev = data->hdev; | |
367 | ||
368 | sdio_set_drvdata(func, NULL); | |
369 | ||
370 | hci_unregister_dev(hdev); | |
371 | ||
372 | hci_free_dev(hdev); | |
373 | } | |
374 | ||
375 | static struct sdio_driver btsdio_driver = { | |
376 | .name = "btsdio", | |
377 | .probe = btsdio_probe, | |
378 | .remove = btsdio_remove, | |
379 | .id_table = btsdio_table, | |
380 | }; | |
381 | ||
382 | static int __init btsdio_init(void) | |
383 | { | |
384 | BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); | |
385 | ||
386 | return sdio_register_driver(&btsdio_driver); | |
387 | } | |
388 | ||
389 | static void __exit btsdio_exit(void) | |
390 | { | |
391 | sdio_unregister_driver(&btsdio_driver); | |
392 | } | |
393 | ||
394 | module_init(btsdio_init); | |
395 | module_exit(btsdio_exit); | |
396 | ||
397 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
398 | MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); | |
399 | MODULE_VERSION(VERSION); | |
400 | MODULE_LICENSE("GPL"); |