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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 | ||
40 | #ifndef CONFIG_BT_HCIBTSDIO_DEBUG | |
41 | #undef BT_DBG | |
42 | #define BT_DBG(D...) | |
43 | #endif | |
44 | ||
45 | #define VERSION "0.1" | |
46 | ||
47 | static const struct sdio_device_id btsdio_table[] = { | |
48 | /* Generic Bluetooth Type-A SDIO device */ | |
49 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) }, | |
50 | ||
51 | /* Generic Bluetooth Type-B SDIO device */ | |
52 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) }, | |
53 | ||
54 | { } /* Terminating entry */ | |
55 | }; | |
56 | ||
57 | MODULE_DEVICE_TABLE(sdio, btsdio_table); | |
58 | ||
59 | struct 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 /* Receiver Data */ | |
69 | #define REG_TDAT 0x00 /* Transmitter Data */ | |
70 | #define REG_PC_RRT 0x10 /* Read Packet Control */ | |
71 | #define REG_PC_WRT 0x11 /* Write Packet Control */ | |
72 | #define REG_RTC_STAT 0x12 /* Retry Control Status */ | |
73 | #define REG_RTC_SET 0x12 /* Retry Control Set */ | |
74 | #define REG_INTRD 0x13 /* Interrupt Indication */ | |
75 | #define REG_CL_INTRD 0x13 /* Interrupt Clear */ | |
76 | #define REG_EN_INTRD 0x14 /* Interrupt Enable */ | |
77 | #define REG_MD_STAT 0x20 /* Bluetooth Mode Status */ | |
78 | ||
79 | static 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 | /* Prepend Type-A header */ | |
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 | ||
105 | static 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 | ||
127 | static 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 | /* Out of memory. Prepare a read retry and just | |
146 | * return with the expectation that the next time | |
147 | * we're called we'll have more memory. */ | |
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); | |
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 | kfree(skb); | |
167 | return err; | |
168 | } | |
169 | ||
170 | sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static void btsdio_interrupt(struct sdio_func *func) | |
176 | { | |
177 | struct btsdio_data *data = sdio_get_drvdata(func); | |
178 | int intrd; | |
179 | ||
180 | BT_DBG("%s", data->hdev->name); | |
181 | ||
182 | intrd = sdio_readb(func, REG_INTRD, NULL); | |
183 | if (intrd & 0x01) { | |
184 | sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); | |
185 | ||
186 | if (btsdio_rx_packet(data) < 0) { | |
187 | data->hdev->stat.err_rx++; | |
188 | sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); | |
189 | } | |
190 | } | |
191 | } | |
192 | ||
193 | static int btsdio_open(struct hci_dev *hdev) | |
194 | { | |
195 | struct btsdio_data *data = hdev->driver_data; | |
196 | int err; | |
197 | ||
198 | BT_DBG("%s", hdev->name); | |
199 | ||
200 | if (test_and_set_bit(HCI_RUNNING, &hdev->flags)) | |
201 | return 0; | |
202 | ||
203 | sdio_claim_host(data->func); | |
204 | ||
205 | err = sdio_enable_func(data->func); | |
206 | if (err < 0) { | |
207 | clear_bit(HCI_RUNNING, &hdev->flags); | |
208 | goto release; | |
209 | } | |
210 | ||
211 | err = sdio_claim_irq(data->func, btsdio_interrupt); | |
212 | if (err < 0) { | |
213 | sdio_disable_func(data->func); | |
214 | clear_bit(HCI_RUNNING, &hdev->flags); | |
215 | goto release; | |
216 | } | |
217 | ||
218 | if (data->func->class == SDIO_CLASS_BT_B) | |
219 | sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL); | |
220 | ||
221 | sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); | |
222 | ||
223 | release: | |
224 | sdio_release_host(data->func); | |
225 | ||
226 | return err; | |
227 | } | |
228 | ||
229 | static int btsdio_close(struct hci_dev *hdev) | |
230 | { | |
231 | struct btsdio_data *data = hdev->driver_data; | |
232 | ||
233 | BT_DBG("%s", hdev->name); | |
234 | ||
235 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) | |
236 | return 0; | |
237 | ||
238 | sdio_claim_host(data->func); | |
239 | ||
240 | sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); | |
241 | ||
242 | sdio_release_irq(data->func); | |
243 | sdio_disable_func(data->func); | |
244 | ||
245 | sdio_release_host(data->func); | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | static int btsdio_flush(struct hci_dev *hdev) | |
251 | { | |
252 | struct btsdio_data *data = hdev->driver_data; | |
253 | ||
254 | BT_DBG("%s", hdev->name); | |
255 | ||
256 | skb_queue_purge(&data->txq); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static int btsdio_send_frame(struct sk_buff *skb) | |
262 | { | |
263 | struct hci_dev *hdev = (struct hci_dev *) skb->dev; | |
264 | struct btsdio_data *data = hdev->driver_data; | |
265 | ||
266 | BT_DBG("%s", hdev->name); | |
267 | ||
268 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
269 | return -EBUSY; | |
270 | ||
271 | switch (bt_cb(skb)->pkt_type) { | |
272 | case HCI_COMMAND_PKT: | |
273 | hdev->stat.cmd_tx++; | |
274 | break; | |
275 | ||
276 | case HCI_ACLDATA_PKT: | |
277 | hdev->stat.acl_tx++; | |
278 | break; | |
279 | ||
280 | case HCI_SCODATA_PKT: | |
281 | hdev->stat.sco_tx++; | |
282 | break; | |
283 | ||
284 | default: | |
285 | return -EILSEQ; | |
286 | } | |
287 | ||
288 | skb_queue_tail(&data->txq, skb); | |
289 | ||
290 | schedule_work(&data->work); | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static void btsdio_destruct(struct hci_dev *hdev) | |
296 | { | |
297 | struct btsdio_data *data = hdev->driver_data; | |
298 | ||
299 | BT_DBG("%s", hdev->name); | |
300 | ||
301 | kfree(data); | |
302 | } | |
303 | ||
304 | static int btsdio_probe(struct sdio_func *func, | |
305 | const struct sdio_device_id *id) | |
306 | { | |
307 | struct btsdio_data *data; | |
308 | struct hci_dev *hdev; | |
309 | struct sdio_func_tuple *tuple = func->tuples; | |
310 | int err; | |
311 | ||
312 | BT_DBG("func %p id %p class 0x%04x", func, id, func->class); | |
313 | ||
314 | while (tuple) { | |
315 | BT_DBG("code 0x%x size %d", tuple->code, tuple->size); | |
316 | tuple = tuple->next; | |
317 | } | |
318 | ||
319 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
320 | if (!data) | |
321 | return -ENOMEM; | |
322 | ||
323 | data->func = func; | |
324 | ||
325 | INIT_WORK(&data->work, btsdio_work); | |
326 | ||
327 | skb_queue_head_init(&data->txq); | |
328 | ||
329 | hdev = hci_alloc_dev(); | |
330 | if (!hdev) { | |
331 | kfree(data); | |
332 | return -ENOMEM; | |
333 | } | |
334 | ||
335 | hdev->type = HCI_SDIO; | |
336 | hdev->driver_data = data; | |
337 | ||
338 | data->hdev = hdev; | |
339 | ||
340 | SET_HCIDEV_DEV(hdev, &func->dev); | |
341 | ||
342 | hdev->open = btsdio_open; | |
343 | hdev->close = btsdio_close; | |
344 | hdev->flush = btsdio_flush; | |
345 | hdev->send = btsdio_send_frame; | |
346 | hdev->destruct = btsdio_destruct; | |
347 | ||
348 | hdev->owner = THIS_MODULE; | |
349 | ||
350 | err = hci_register_dev(hdev); | |
351 | if (err < 0) { | |
352 | hci_free_dev(hdev); | |
353 | kfree(data); | |
354 | return err; | |
355 | } | |
356 | ||
357 | sdio_set_drvdata(func, data); | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | static void btsdio_remove(struct sdio_func *func) | |
363 | { | |
364 | struct btsdio_data *data = sdio_get_drvdata(func); | |
365 | struct hci_dev *hdev; | |
366 | ||
367 | BT_DBG("func %p", func); | |
368 | ||
369 | if (!data) | |
370 | return; | |
371 | ||
372 | hdev = data->hdev; | |
373 | ||
374 | sdio_set_drvdata(func, NULL); | |
375 | ||
376 | hci_unregister_dev(hdev); | |
377 | ||
378 | hci_free_dev(hdev); | |
379 | } | |
380 | ||
381 | static struct sdio_driver btsdio_driver = { | |
382 | .name = "btsdio", | |
383 | .probe = btsdio_probe, | |
384 | .remove = btsdio_remove, | |
385 | .id_table = btsdio_table, | |
386 | }; | |
387 | ||
388 | static int __init btsdio_init(void) | |
389 | { | |
390 | BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); | |
391 | ||
392 | return sdio_register_driver(&btsdio_driver); | |
393 | } | |
394 | ||
395 | static void __exit btsdio_exit(void) | |
396 | { | |
397 | sdio_unregister_driver(&btsdio_driver); | |
398 | } | |
399 | ||
400 | module_init(btsdio_init); | |
401 | module_exit(btsdio_exit); | |
402 | ||
403 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
404 | MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); | |
405 | MODULE_VERSION(VERSION); | |
406 | MODULE_LICENSE("GPL"); |