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Linux/drivers/bluetooth/btsdio.c

  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 #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         /* Generic Bluetooth AMP controller */
 50         { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) },
 51 
 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 */
 76 #define REG_MD_SET   0x20       /* Bluetooth Mode Set */
 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) {
 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 
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(skb);
156                 return err;
157         }
158 
159         data->hdev->stat.byte_rx += len;
160 
161         bt_cb(skb)->pkt_type = 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 
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 {
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_SET, NULL);
217 
218         sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
219 
220 release:
221         sdio_release_host(data->func);
222 
223         return err;
224 }
225 
226 static 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 
247 static 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 
258 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
259 {
260         struct btsdio_data *data = hci_get_drvdata(hdev);
261 
262         BT_DBG("%s", hdev->name);
263 
264         if (!test_bit(HCI_RUNNING, &hdev->flags))
265                 return -EBUSY;
266 
267         switch (bt_cb(skb)->pkt_type) {
268         case HCI_COMMAND_PKT:
269                 hdev->stat.cmd_tx++;
270                 break;
271 
272         case HCI_ACLDATA_PKT:
273                 hdev->stat.acl_tx++;
274                 break;
275 
276         case HCI_SCODATA_PKT:
277                 hdev->stat.sco_tx++;
278                 break;
279 
280         default:
281                 return -EILSEQ;
282         }
283 
284         skb_queue_tail(&data->txq, skb);
285 
286         schedule_work(&data->work);
287 
288         return 0;
289 }
290 
291 static int btsdio_probe(struct sdio_func *func,
292                                 const struct sdio_device_id *id)
293 {
294         struct btsdio_data *data;
295         struct hci_dev *hdev;
296         struct sdio_func_tuple *tuple = func->tuples;
297         int err;
298 
299         BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
300 
301         while (tuple) {
302                 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
303                 tuple = tuple->next;
304         }
305 
306         data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
307         if (!data)
308                 return -ENOMEM;
309 
310         data->func = func;
311 
312         INIT_WORK(&data->work, btsdio_work);
313 
314         skb_queue_head_init(&data->txq);
315 
316         hdev = hci_alloc_dev();
317         if (!hdev)
318                 return -ENOMEM;
319 
320         hdev->bus = HCI_SDIO;
321         hci_set_drvdata(hdev, data);
322 
323         if (id->class == SDIO_CLASS_BT_AMP)
324                 hdev->dev_type = HCI_AMP;
325         else
326                 hdev->dev_type = HCI_BREDR;
327 
328         data->hdev = hdev;
329 
330         SET_HCIDEV_DEV(hdev, &func->dev);
331 
332         hdev->open     = btsdio_open;
333         hdev->close    = btsdio_close;
334         hdev->flush    = btsdio_flush;
335         hdev->send     = btsdio_send_frame;
336 
337         if (func->vendor == 0x0104 && func->device == 0x00c5)
338                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
339 
340         err = hci_register_dev(hdev);
341         if (err < 0) {
342                 hci_free_dev(hdev);
343                 return err;
344         }
345 
346         sdio_set_drvdata(func, data);
347 
348         return 0;
349 }
350 
351 static void btsdio_remove(struct sdio_func *func)
352 {
353         struct btsdio_data *data = sdio_get_drvdata(func);
354         struct hci_dev *hdev;
355 
356         BT_DBG("func %p", func);
357 
358         if (!data)
359                 return;
360 
361         hdev = data->hdev;
362 
363         sdio_set_drvdata(func, NULL);
364 
365         hci_unregister_dev(hdev);
366 
367         hci_free_dev(hdev);
368 }
369 
370 static struct sdio_driver btsdio_driver = {
371         .name           = "btsdio",
372         .probe          = btsdio_probe,
373         .remove         = btsdio_remove,
374         .id_table       = btsdio_table,
375 };
376 
377 static int __init btsdio_init(void)
378 {
379         BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
380 
381         return sdio_register_driver(&btsdio_driver);
382 }
383 
384 static void __exit btsdio_exit(void)
385 {
386         sdio_unregister_driver(&btsdio_driver);
387 }
388 
389 module_init(btsdio_init);
390 module_exit(btsdio_exit);
391 
392 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
393 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
394 MODULE_VERSION(VERSION);
395 MODULE_LICENSE("GPL");
396 

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