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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] = 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 
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         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 
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         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 
214 release:
215         sdio_release_host(data->func);
216 
217         return err;
218 }
219 
220 static 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 
238 static 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 
249 static 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 
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 
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_BREDR;
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 
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");
384 

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