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#define REG_MD_SET   0x20	/* Bluetooth Mode Set */
77
78static 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
105static 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
127static 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
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_SET, 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 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
291static 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
351static 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
370static struct sdio_driver btsdio_driver = {
371	.name		= "btsdio",
372	.probe		= btsdio_probe,
373	.remove		= btsdio_remove,
374	.id_table	= btsdio_table,
375};
376
377static 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
384static void __exit btsdio_exit(void)
385{
386	sdio_unregister_driver(&btsdio_driver);
387}
388
389module_init(btsdio_init);
390module_exit(btsdio_exit);
391
392MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
393MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
394MODULE_VERSION(VERSION);
395MODULE_LICENSE("GPL");
396