[linux-2.6-block.git] / drivers / bluetooth / btsdio.c

/*
 *
 *  Generic Bluetooth SDIO driver
 *
 *  Copyright (C) 2007  Cambridge Silicon Radio Ltd.
 *  Copyright (C) 2007  Marcel Holtmann <marcel@holtmann.org>
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/skbuff.h>

#include <linux/mmc/sdio_ids.h>
#include <linux/mmc/sdio_func.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#ifndef CONFIG_BT_HCIBTSDIO_DEBUG
#undef  BT_DBG
#define BT_DBG(D...)
#endif

#define VERSION "0.1"

static const struct sdio_device_id btsdio_table[] = {
	/* Generic Bluetooth Type-A SDIO device */
	{ SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },

	/* Generic Bluetooth Type-B SDIO device */
	{ SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },

	{ }	/* Terminating entry */
};

MODULE_DEVICE_TABLE(sdio, btsdio_table);

struct btsdio_data {
	struct hci_dev   *hdev;
	struct sdio_func *func;

	struct work_struct work;

	struct sk_buff_head txq;
};

#define REG_RDAT     0x00	/* Receiver Data */
#define REG_TDAT     0x00	/* Transmitter Data */
#define REG_PC_RRT   0x10	/* Read Packet Control */
#define REG_PC_WRT   0x11	/* Write Packet Control */
#define REG_RTC_STAT 0x12	/* Retry Control Status */
#define REG_RTC_SET  0x12	/* Retry Control Set */
#define REG_INTRD    0x13	/* Interrupt Indication */
#define REG_CL_INTRD 0x13	/* Interrupt Clear */
#define REG_EN_INTRD 0x14	/* Interrupt Enable */
#define REG_MD_STAT  0x20	/* Bluetooth Mode Status */

static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
{
	int err;

	BT_DBG("%s", data->hdev->name);

	/* Prepend Type-A header */
	skb_push(skb, 4);
	skb->data[0] = (skb->len & 0x0000ff);
	skb->data[1] = (skb->len & 0x00ff00) >> 8;
	skb->data[2] = (skb->len & 0xff0000) >> 16;
	skb->data[3] = bt_cb(skb)->pkt_type;

	err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
	if (err < 0) {
		sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
		return err;
	}

	data->hdev->stat.byte_tx += skb->len;

	kfree_skb(skb);

	return 0;
}

static void btsdio_work(struct work_struct *work)
{
	struct btsdio_data *data = container_of(work, struct btsdio_data, work);
	struct sk_buff *skb;
	int err;

	BT_DBG("%s", data->hdev->name);

	sdio_claim_host(data->func);

	while ((skb = skb_dequeue(&data->txq))) {
		err = btsdio_tx_packet(data, skb);
		if (err < 0) {
			data->hdev->stat.err_tx++;
			skb_queue_head(&data->txq, skb);
			break;
		}
	}

	sdio_release_host(data->func);
}

static int btsdio_rx_packet(struct btsdio_data *data)
{
	u8 hdr[4] __attribute__ ((aligned(4)));
	struct sk_buff *skb;
	int err, len;

	BT_DBG("%s", data->hdev->name);

	err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
	if (err < 0)
		return err;

	len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
	if (len < 4 || len > 65543)
		return -EILSEQ;

	skb = bt_skb_alloc(len - 4, GFP_KERNEL);
	if (!skb) {
		/* Out of memory. Prepare a read retry and just
		 * return with the expectation that the next time
		 * we're called we'll have more memory. */
		return -ENOMEM;
	}

	skb_put(skb, len - 4);

	err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
	if (err < 0) {
		kfree_skb(skb);
		return err;
	}

	data->hdev->stat.byte_rx += len;

	skb->dev = (void *) data->hdev;
	bt_cb(skb)->pkt_type = hdr[3];

	err = hci_recv_frame(skb);
	if (err < 0)
		return err;

	sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);

	return 0;
}

static void btsdio_interrupt(struct sdio_func *func)
{
	struct btsdio_data *data = sdio_get_drvdata(func);
	int intrd;

	BT_DBG("%s", data->hdev->name);

	intrd = sdio_readb(func, REG_INTRD, NULL);
	if (intrd & 0x01) {
		sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);

		if (btsdio_rx_packet(data) < 0) {
			data->hdev->stat.err_rx++;
			sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
		}
	}
}

static int btsdio_open(struct hci_dev *hdev)
{
	struct btsdio_data *data = hdev->driver_data;
	int err;

	BT_DBG("%s", hdev->name);

	if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
		return 0;

	sdio_claim_host(data->func);

	err = sdio_enable_func(data->func);
	if (err < 0) {
		clear_bit(HCI_RUNNING, &hdev->flags);
		goto release;
	}

	err = sdio_claim_irq(data->func, btsdio_interrupt);
	if (err < 0) {
		sdio_disable_func(data->func);
		clear_bit(HCI_RUNNING, &hdev->flags);
		goto release;
	}

	if (data->func->class == SDIO_CLASS_BT_B)
		sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL);

	sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);

release:
	sdio_release_host(data->func);

	return err;
}

static int btsdio_close(struct hci_dev *hdev)
{
	struct btsdio_data *data = hdev->driver_data;

	BT_DBG("%s", hdev->name);

	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
		return 0;

	sdio_claim_host(data->func);

	sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);

	sdio_release_irq(data->func);
	sdio_disable_func(data->func);

	sdio_release_host(data->func);

	return 0;
}

static int btsdio_flush(struct hci_dev *hdev)
{
	struct btsdio_data *data = hdev->driver_data;

	BT_DBG("%s", hdev->name);

	skb_queue_purge(&data->txq);

	return 0;
}

static int btsdio_send_frame(struct sk_buff *skb)
{
	struct hci_dev *hdev = (struct hci_dev *) skb->dev;
	struct btsdio_data *data = hdev->driver_data;

	BT_DBG("%s", hdev->name);

	if (!test_bit(HCI_RUNNING, &hdev->flags))
		return -EBUSY;

	switch (bt_cb(skb)->pkt_type) {
	case HCI_COMMAND_PKT:
		hdev->stat.cmd_tx++;
		break;

	case HCI_ACLDATA_PKT:
		hdev->stat.acl_tx++;
		break;

	case HCI_SCODATA_PKT:
		hdev->stat.sco_tx++;
		break;

	default:
		return -EILSEQ;
	}

	skb_queue_tail(&data->txq, skb);

	schedule_work(&data->work);

	return 0;
}

static void btsdio_destruct(struct hci_dev *hdev)
{
	struct btsdio_data *data = hdev->driver_data;

	BT_DBG("%s", hdev->name);

	kfree(data);
}

static int btsdio_probe(struct sdio_func *func,
				const struct sdio_device_id *id)
{
	struct btsdio_data *data;
	struct hci_dev *hdev;
	struct sdio_func_tuple *tuple = func->tuples;
	int err;

	BT_DBG("func %p id %p class 0x%04x", func, id, func->class);

	while (tuple) {
		BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
		tuple = tuple->next;
	}

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->func = func;

	INIT_WORK(&data->work, btsdio_work);

	skb_queue_head_init(&data->txq);

	hdev = hci_alloc_dev();
	if (!hdev) {
		kfree(data);
		return -ENOMEM;
	}

	hdev->type = HCI_SDIO;
	hdev->driver_data = data;

	data->hdev = hdev;

	SET_HCIDEV_DEV(hdev, &func->dev);

	hdev->open     = btsdio_open;
	hdev->close    = btsdio_close;
	hdev->flush    = btsdio_flush;
	hdev->send     = btsdio_send_frame;
	hdev->destruct = btsdio_destruct;

	hdev->owner = THIS_MODULE;

	err = hci_register_dev(hdev);
	if (err < 0) {
		hci_free_dev(hdev);
		kfree(data);
		return err;
	}

	sdio_set_drvdata(func, data);

	return 0;
}

static void btsdio_remove(struct sdio_func *func)
{
	struct btsdio_data *data = sdio_get_drvdata(func);
	struct hci_dev *hdev;

	BT_DBG("func %p", func);

	if (!data)
		return;

	hdev = data->hdev;

	sdio_set_drvdata(func, NULL);

	hci_unregister_dev(hdev);

	hci_free_dev(hdev);
}

static struct sdio_driver btsdio_driver = {
	.name		= "btsdio",
	.probe		= btsdio_probe,
	.remove		= btsdio_remove,
	.id_table	= btsdio_table,
};

static int __init btsdio_init(void)
{
	BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);

	return sdio_register_driver(&btsdio_driver);
}

static void __exit btsdio_exit(void)
{
	sdio_unregister_driver(&btsdio_driver);
}

module_init(btsdio_init);
module_exit(btsdio_exit);

MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
Commit	Line	Data
ddbaf13e MH	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	#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) {
cbfd24a7	155	kfree_skb(skb);
ddbaf13e MH	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);
2fa99342	165	if (err < 0)
ddbaf13e	166	return err;
ddbaf13e MH	167
	168	sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
	169
	170	return 0;
	171	}
	172
	173	static void btsdio_interrupt(struct sdio_func *func)
	174	{
	175	struct btsdio_data *data = sdio_get_drvdata(func);
	176	int intrd;
	177
	178	BT_DBG("%s", data->hdev->name);
	179
	180	intrd = sdio_readb(func, REG_INTRD, NULL);
	181	if (intrd & 0x01) {
	182	sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
	183
	184	if (btsdio_rx_packet(data) < 0) {
	185	data->hdev->stat.err_rx++;
	186	sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
	187	}
	188	}
	189	}
	190
	191	static int btsdio_open(struct hci_dev *hdev)
	192	{
	193	struct btsdio_data *data = hdev->driver_data;
	194	int err;
	195
	196	BT_DBG("%s", hdev->name);
	197
	198	if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
	199	return 0;
	200
	201	sdio_claim_host(data->func);
	202
	203	err = sdio_enable_func(data->func);
	204	if (err < 0) {
	205	clear_bit(HCI_RUNNING, &hdev->flags);
	206	goto release;
	207	}
	208
	209	err = sdio_claim_irq(data->func, btsdio_interrupt);
	210	if (err < 0) {
	211	sdio_disable_func(data->func);
	212	clear_bit(HCI_RUNNING, &hdev->flags);
	213	goto release;
	214	}
	215
	216	if (data->func->class == SDIO_CLASS_BT_B)
	217	sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL);
	218
	219	sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
	220
	221	release:
	222	sdio_release_host(data->func);
	223
	224	return err;
	225	}
	226
	227	static int btsdio_close(struct hci_dev *hdev)
	228	{
	229	struct btsdio_data *data = hdev->driver_data;
	230
231	BT_DBG("%s", hdev->name);
232
233	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
234	return 0;
235
236	sdio_claim_host(data->func);
237
238	sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
239
240	sdio_release_irq(data->func);
241	sdio_disable_func(data->func);
242
243	sdio_release_host(data->func);
244
245	return 0;
246	}
247
248	static int btsdio_flush(struct hci_dev *hdev)
249	{
250	struct btsdio_data *data = hdev->driver_data;
251
252	BT_DBG("%s", hdev->name);
253
254	skb_queue_purge(&data->txq);
255
256	return 0;
257	}
258
259	static int btsdio_send_frame(struct sk_buff *skb)
260	{
261	struct hci_dev hdev = (struct hci_dev ) skb->dev;
262	struct btsdio_data *data = hdev->driver_data;
263
264	BT_DBG("%s", hdev->name);
265
266	if (!test_bit(HCI_RUNNING, &hdev->flags))
267	return -EBUSY;
268
269	switch (bt_cb(skb)->pkt_type) {
270	case HCI_COMMAND_PKT:
271	hdev->stat.cmd_tx++;
272	break;
273
274	case HCI_ACLDATA_PKT:
275	hdev->stat.acl_tx++;
276	break;
277
278	case HCI_SCODATA_PKT:
279	hdev->stat.sco_tx++;
280	break;
281
282	default:
283	return -EILSEQ;
284	}
285
286	skb_queue_tail(&data->txq, skb);
287
288	schedule_work(&data->work);
289
290	return 0;
291	}
292
293	static void btsdio_destruct(struct hci_dev *hdev)
294	{
295	struct btsdio_data *data = hdev->driver_data;
296
297	BT_DBG("%s", hdev->name);
298
299	kfree(data);
300	}
301
302	static int btsdio_probe(struct sdio_func *func,
303	const struct sdio_device_id *id)
304	{
305	struct btsdio_data *data;
306	struct hci_dev *hdev;
307	struct sdio_func_tuple *tuple = func->tuples;
308	int err;
309
310	BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
311
312	while (tuple) {
313	BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
314	tuple = tuple->next;
315	}
316
317	data = kzalloc(sizeof(*data), GFP_KERNEL);
318	if (!data)
319	return -ENOMEM;
320
321	data->func = func;
322
323	INIT_WORK(&data->work, btsdio_work);
324
325	skb_queue_head_init(&data->txq);
326
327	hdev = hci_alloc_dev();
328	if (!hdev) {
329	kfree(data);
330	return -ENOMEM;
331	}
332
333	hdev->type = HCI_SDIO;
334	hdev->driver_data = data;
335
336	data->hdev = hdev;
337
338	SET_HCIDEV_DEV(hdev, &func->dev);
339
340	hdev->open = btsdio_open;
341	hdev->close = btsdio_close;
342	hdev->flush = btsdio_flush;
343	hdev->send = btsdio_send_frame;
344	hdev->destruct = btsdio_destruct;
345
346	hdev->owner = THIS_MODULE;
347
348	err = hci_register_dev(hdev);
349	if (err < 0) {
350	hci_free_dev(hdev);
351	kfree(data);
352	return err;
353	}
354
355	sdio_set_drvdata(func, data);
356
357	return 0;
358	}
359
360	static void btsdio_remove(struct sdio_func *func)
361	{
362	struct btsdio_data *data = sdio_get_drvdata(func);
363	struct hci_dev *hdev;
364
365	BT_DBG("func %p", func);
366
367	if (!data)
368	return;
369
370	hdev = data->hdev;
371
372	sdio_set_drvdata(func, NULL);
373
374	hci_unregister_dev(hdev);
375
376	hci_free_dev(hdev);
377	}
378
379	static struct sdio_driver btsdio_driver = {
380	.name = "btsdio",
381	.probe = btsdio_probe,
382	.remove = btsdio_remove,
383	.id_table = btsdio_table,
384	};
385
386	static int __init btsdio_init(void)
387	{
388	BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
389
390	return sdio_register_driver(&btsdio_driver);
391	}
392
393	static void __exit btsdio_exit(void)
394	{
395	sdio_unregister_driver(&btsdio_driver);
396	}
397
398	module_init(btsdio_init);
399	module_exit(btsdio_exit);
400
401	MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
402	MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
403	MODULE_VERSION(VERSION);
404	MODULE_LICENSE("GPL");