Root/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
42static 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
55MODULE_DEVICE_TABLE(sdio, btsdio_table);
56
57struct 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
77static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
78{
79    int err;
80
81    BT_DBG("%s", data->hdev->name);
82
83    /* Prepend Type-A header */
84    skb_push(skb, 4);
85    skb->data[0] = (skb->len & 0x0000ff);
86    skb->data[1] = (skb->len & 0x00ff00) >> 8;
87    skb->data[2] = (skb->len & 0xff0000) >> 16;
88    skb->data[3] = bt_cb(skb)->pkt_type;
89
90    err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
91    if (err < 0) {
92        skb_pull(skb, 4);
93        sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
94        return err;
95    }
96
97    data->hdev->stat.byte_tx += skb->len;
98
99    kfree_skb(skb);
100
101    return 0;
102}
103
104static void btsdio_work(struct work_struct *work)
105{
106    struct btsdio_data *data = container_of(work, struct btsdio_data, work);
107    struct sk_buff *skb;
108    int err;
109
110    BT_DBG("%s", data->hdev->name);
111
112    sdio_claim_host(data->func);
113
114    while ((skb = skb_dequeue(&data->txq))) {
115        err = btsdio_tx_packet(data, skb);
116        if (err < 0) {
117            data->hdev->stat.err_tx++;
118            skb_queue_head(&data->txq, skb);
119            break;
120        }
121    }
122
123    sdio_release_host(data->func);
124}
125
126static int btsdio_rx_packet(struct btsdio_data *data)
127{
128    u8 hdr[4] __attribute__ ((aligned(4)));
129    struct sk_buff *skb;
130    int err, len;
131
132    BT_DBG("%s", data->hdev->name);
133
134    err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
135    if (err < 0)
136        return err;
137
138    len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
139    if (len < 4 || len > 65543)
140        return -EILSEQ;
141
142    skb = bt_skb_alloc(len - 4, GFP_KERNEL);
143    if (!skb) {
144        /* Out of memory. Prepare a read retry and just
145         * return with the expectation that the next time
146         * we're called we'll have more memory. */
147        return -ENOMEM;
148    }
149
150    skb_put(skb, len - 4);
151
152    err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
153    if (err < 0) {
154        kfree_skb(skb);
155        return err;
156    }
157
158    data->hdev->stat.byte_rx += len;
159
160    skb->dev = (void *) data->hdev;
161    bt_cb(skb)->pkt_type = hdr[3];
162
163    err = hci_recv_frame(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
172static 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
190static 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_STAT, NULL);
217
218    sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
219
220release:
221    sdio_release_host(data->func);
222
223    return err;
224}
225
226static 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
247static 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
258static int btsdio_send_frame(struct sk_buff *skb)
259{
260    struct hci_dev *hdev = (struct hci_dev *) skb->dev;
261    struct btsdio_data *data = hci_get_drvdata(hdev);
262
263    BT_DBG("%s", hdev->name);
264
265    if (!test_bit(HCI_RUNNING, &hdev->flags))
266        return -EBUSY;
267
268    switch (bt_cb(skb)->pkt_type) {
269    case HCI_COMMAND_PKT:
270        hdev->stat.cmd_tx++;
271        break;
272
273    case HCI_ACLDATA_PKT:
274        hdev->stat.acl_tx++;
275        break;
276
277    case HCI_SCODATA_PKT:
278        hdev->stat.sco_tx++;
279        break;
280
281    default:
282        return -EILSEQ;
283    }
284
285    skb_queue_tail(&data->txq, skb);
286
287    schedule_work(&data->work);
288
289    return 0;
290}
291
292static int btsdio_probe(struct sdio_func *func,
293                const struct sdio_device_id *id)
294{
295    struct btsdio_data *data;
296    struct hci_dev *hdev;
297    struct sdio_func_tuple *tuple = func->tuples;
298    int err;
299
300    BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
301
302    while (tuple) {
303        BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
304        tuple = tuple->next;
305    }
306
307    data = kzalloc(sizeof(*data), GFP_KERNEL);
308    if (!data)
309        return -ENOMEM;
310
311    data->func = func;
312
313    INIT_WORK(&data->work, btsdio_work);
314
315    skb_queue_head_init(&data->txq);
316
317    hdev = hci_alloc_dev();
318    if (!hdev) {
319        kfree(data);
320        return -ENOMEM;
321    }
322
323    hdev->bus = HCI_SDIO;
324    hci_set_drvdata(hdev, data);
325
326    if (id->class == SDIO_CLASS_BT_AMP)
327        hdev->dev_type = HCI_AMP;
328    else
329        hdev->dev_type = HCI_BREDR;
330
331    data->hdev = hdev;
332
333    SET_HCIDEV_DEV(hdev, &func->dev);
334
335    hdev->open = btsdio_open;
336    hdev->close = btsdio_close;
337    hdev->flush = btsdio_flush;
338    hdev->send = btsdio_send_frame;
339
340    err = hci_register_dev(hdev);
341    if (err < 0) {
342        hci_free_dev(hdev);
343        kfree(data);
344        return err;
345    }
346
347    sdio_set_drvdata(func, data);
348
349    return 0;
350}
351
352static void btsdio_remove(struct sdio_func *func)
353{
354    struct btsdio_data *data = sdio_get_drvdata(func);
355    struct hci_dev *hdev;
356
357    BT_DBG("func %p", func);
358
359    if (!data)
360        return;
361
362    hdev = data->hdev;
363
364    sdio_set_drvdata(func, NULL);
365
366    hci_unregister_dev(hdev);
367
368    hci_free_dev(hdev);
369    kfree(data);
370}
371
372static struct sdio_driver btsdio_driver = {
373    .name = "btsdio",
374    .probe = btsdio_probe,
375    .remove = btsdio_remove,
376    .id_table = btsdio_table,
377};
378
379static int __init btsdio_init(void)
380{
381    BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
382
383    return sdio_register_driver(&btsdio_driver);
384}
385
386static void __exit btsdio_exit(void)
387{
388    sdio_unregister_driver(&btsdio_driver);
389}
390
391module_init(btsdio_init);
392module_exit(btsdio_exit);
393
394MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
395MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
396MODULE_VERSION(VERSION);
397MODULE_LICENSE("GPL");
398

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