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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 | ||
fb3d8eb4 DV |
49 | /* Generic Bluetooth AMP controller */ |
50 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) }, | |
51 | ||
ddbaf13e MH |
52 | { } /* Terminating entry */ |
53 | }; | |
54 | ||
55 | MODULE_DEVICE_TABLE(sdio, btsdio_table); | |
56 | ||
57 | struct 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 /* Receiver Data */ | |
67 | #define REG_TDAT 0x00 /* Transmitter Data */ | |
68 | #define REG_PC_RRT 0x10 /* Read Packet Control */ | |
69 | #define REG_PC_WRT 0x11 /* Write Packet Control */ | |
70 | #define REG_RTC_STAT 0x12 /* Retry Control Status */ | |
71 | #define REG_RTC_SET 0x12 /* Retry Control Set */ | |
72 | #define REG_INTRD 0x13 /* Interrupt Indication */ | |
73 | #define REG_CL_INTRD 0x13 /* Interrupt Clear */ | |
74 | #define REG_EN_INTRD 0x14 /* Interrupt Enable */ | |
75 | #define REG_MD_STAT 0x20 /* Bluetooth Mode Status */ | |
bc721970 | 76 | #define REG_MD_SET 0x20 /* Bluetooth Mode Set */ |
ddbaf13e MH |
77 | |
78 | static 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 | /* Prepend Type-A header */ | |
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] = bt_cb(skb)->pkt_type; | |
90 | ||
91 | err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len); | |
92 | if (err < 0) { | |
7644d63d | 93 | skb_pull(skb, 4); |
ddbaf13e MH |
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) { | |
cbfd24a7 | 155 | kfree_skb(skb); |
ddbaf13e MH |
156 | return err; |
157 | } | |
158 | ||
159 | data->hdev->stat.byte_rx += len; | |
160 | ||
ddbaf13e MH |
161 | bt_cb(skb)->pkt_type = hdr[3]; |
162 | ||
e1a26170 | 163 | err = hci_recv_frame(data->hdev, skb); |
2fa99342 | 164 | if (err < 0) |
ddbaf13e | 165 | return err; |
ddbaf13e MH |
166 | |
167 | sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | static 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 | ||
190 | static int btsdio_open(struct hci_dev *hdev) | |
191 | { | |
155961e8 | 192 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
193 | int err; |
194 | ||
195 | BT_DBG("%s", hdev->name); | |
196 | ||
ddbaf13e MH |
197 | sdio_claim_host(data->func); |
198 | ||
199 | err = sdio_enable_func(data->func); | |
e9ca8bf1 | 200 | if (err < 0) |
ddbaf13e | 201 | goto release; |
ddbaf13e MH |
202 | |
203 | err = sdio_claim_irq(data->func, btsdio_interrupt); | |
204 | if (err < 0) { | |
205 | sdio_disable_func(data->func); | |
ddbaf13e MH |
206 | goto release; |
207 | } | |
208 | ||
209 | if (data->func->class == SDIO_CLASS_BT_B) | |
bc721970 | 210 | sdio_writeb(data->func, 0x00, REG_MD_SET, NULL); |
ddbaf13e MH |
211 | |
212 | sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); | |
213 | ||
214 | release: | |
215 | sdio_release_host(data->func); | |
216 | ||
217 | return err; | |
218 | } | |
219 | ||
220 | static int btsdio_close(struct hci_dev *hdev) | |
221 | { | |
155961e8 | 222 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
223 | |
224 | BT_DBG("%s", hdev->name); | |
225 | ||
ddbaf13e MH |
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 | ||
238 | static int btsdio_flush(struct hci_dev *hdev) | |
239 | { | |
155961e8 | 240 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
241 | |
242 | BT_DBG("%s", hdev->name); | |
243 | ||
244 | skb_queue_purge(&data->txq); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
7bd8f09f | 249 | static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
ddbaf13e | 250 | { |
155961e8 | 251 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
252 | |
253 | BT_DBG("%s", hdev->name); | |
254 | ||
ddbaf13e MH |
255 | switch (bt_cb(skb)->pkt_type) { |
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 | ||
ddbaf13e MH |
279 | static 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 | ||
3a382772 | 294 | data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL); |
ddbaf13e MH |
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(); | |
3a382772 | 305 | if (!hdev) |
ddbaf13e | 306 | return -ENOMEM; |
ddbaf13e | 307 | |
c13854ce | 308 | hdev->bus = HCI_SDIO; |
155961e8 | 309 | hci_set_drvdata(hdev, data); |
ddbaf13e | 310 | |
fb3d8eb4 DV |
311 | if (id->class == SDIO_CLASS_BT_AMP) |
312 | hdev->dev_type = HCI_AMP; | |
313 | else | |
314 | hdev->dev_type = HCI_BREDR; | |
315 | ||
ddbaf13e MH |
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; | |
ddbaf13e | 324 | |
de8b5828 MH |
325 | if (func->vendor == 0x0104 && func->device == 0x00c5) |
326 | set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); | |
327 | ||
ddbaf13e MH |
328 | err = hci_register_dev(hdev); |
329 | if (err < 0) { | |
330 | hci_free_dev(hdev); | |
ddbaf13e MH |
331 | return err; |
332 | } | |
333 | ||
334 | sdio_set_drvdata(func, data); | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | static 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 | ||
358 | static struct sdio_driver btsdio_driver = { | |
359 | .name = "btsdio", | |
360 | .probe = btsdio_probe, | |
361 | .remove = btsdio_remove, | |
362 | .id_table = btsdio_table, | |
363 | }; | |
364 | ||
365 | static 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 | ||
372 | static void __exit btsdio_exit(void) | |
373 | { | |
374 | sdio_unregister_driver(&btsdio_driver); | |
375 | } | |
376 | ||
377 | module_init(btsdio_init); | |
378 | module_exit(btsdio_exit); | |
379 | ||
380 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
381 | MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); | |
382 | MODULE_VERSION(VERSION); | |
383 | MODULE_LICENSE("GPL"); |