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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [bluetooth/] [btsdio.c] - Blame information for rev 67

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Line No. Rev Author Line
1 62 marcus.erl
/*
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");

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