[linux-2.6-block.git] / drivers / media / video / saa6588.c

/*
    Driver for SAA6588 RDS decoder

    (c) 2005 Hans J. Koch

    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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/types.h>
#include <linux/videodev.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/wait.h>
#include <asm/uaccess.h>

#include <media/rds.h>
#include <media/v4l2-common.h>
#include <media/v4l2-i2c-drv-legacy.h>

/* Addresses to scan */
static unsigned short normal_i2c[] = {
	0x20 >> 1,
	0x22 >> 1,
	I2C_CLIENT_END,
};

I2C_CLIENT_INSMOD;

/* insmod options */
static unsigned int debug;
static unsigned int xtal;
static unsigned int rbds;
static unsigned int plvl;
static unsigned int bufblocks = 100;

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable debug messages");
module_param(xtal, int, 0);
MODULE_PARM_DESC(xtal, "select oscillator frequency (0..3), default 0");
module_param(rbds, int, 0);
MODULE_PARM_DESC(rbds, "select mode, 0=RDS, 1=RBDS, default 0");
module_param(plvl, int, 0);
MODULE_PARM_DESC(plvl, "select pause level (0..3), default 0");
module_param(bufblocks, int, 0);
MODULE_PARM_DESC(bufblocks, "number of buffered blocks, default 100");

MODULE_DESCRIPTION("v4l2 driver module for SAA6588 RDS decoder");
MODULE_AUTHOR("Hans J. Koch <koch@hjk-az.de>");

MODULE_LICENSE("GPL");

/* ---------------------------------------------------------------------- */

#define UNSET       (-1U)
#define PREFIX      "saa6588: "
#define dprintk     if (debug) printk

struct saa6588 {
	struct i2c_client *client;
	struct work_struct work;
	struct timer_list timer;
	spinlock_t lock;
	unsigned char *buffer;
	unsigned int buf_size;
	unsigned int rd_index;
	unsigned int wr_index;
	unsigned int block_count;
	unsigned char last_blocknum;
	wait_queue_head_t read_queue;
	int data_available_for_read;
};

/* ---------------------------------------------------------------------- */

/*
 * SAA6588 defines
 */

/* Initialization and mode control byte (0w) */

/* bit 0+1 (DAC0/DAC1) */
#define cModeStandard           0x00
#define cModeFastPI             0x01
#define cModeReducedRequest     0x02
#define cModeInvalid            0x03

/* bit 2 (RBDS) */
#define cProcessingModeRDS      0x00
#define cProcessingModeRBDS     0x04

/* bit 3+4 (SYM0/SYM1) */
#define cErrCorrectionNone      0x00
#define cErrCorrection2Bits     0x08
#define cErrCorrection5Bits     0x10
#define cErrCorrectionNoneRBDS  0x18

/* bit 5 (NWSY) */
#define cSyncNormal             0x00
#define cSyncRestart            0x20

/* bit 6 (TSQD) */
#define cSigQualityDetectOFF    0x00
#define cSigQualityDetectON     0x40

/* bit 7 (SQCM) */
#define cSigQualityTriggered    0x00
#define cSigQualityContinous    0x80

/* Pause level and flywheel control byte (1w) */

/* bits 0..5 (FEB0..FEB5) */
#define cFlywheelMaxBlocksMask  0x3F
#define cFlywheelDefault        0x20

/* bits 6+7 (PL0/PL1) */
#define cPauseLevel_11mV	0x00
#define cPauseLevel_17mV        0x40
#define cPauseLevel_27mV        0x80
#define cPauseLevel_43mV        0xC0

/* Pause time/oscillator frequency/quality detector control byte (1w) */

/* bits 0..4 (SQS0..SQS4) */
#define cQualityDetectSensMask  0x1F
#define cQualityDetectDefault   0x0F

/* bit 5 (SOSC) */
#define cSelectOscFreqOFF	0x00
#define cSelectOscFreqON	0x20

/* bit 6+7 (PTF0/PTF1) */
#define cOscFreq_4332kHz	0x00
#define cOscFreq_8664kHz	0x40
#define cOscFreq_12996kHz	0x80
#define cOscFreq_17328kHz	0xC0

/* ---------------------------------------------------------------------- */

static int block_to_user_buf(struct saa6588 *s, unsigned char __user *user_buf)
{
	int i;

	if (s->rd_index == s->wr_index) {
		if (debug > 2)
			dprintk(PREFIX "Read: buffer empty.\n");
		return 0;
	}

	if (debug > 2) {
		dprintk(PREFIX "Read: ");
		for (i = s->rd_index; i < s->rd_index + 3; i++)
			dprintk("0x%02x ", s->buffer[i]);
	}

	if (copy_to_user(user_buf, &s->buffer[s->rd_index], 3))
		return -EFAULT;

	s->rd_index += 3;
	if (s->rd_index >= s->buf_size)
		s->rd_index = 0;
	s->block_count--;

	if (debug > 2)
		dprintk("%d blocks total.\n", s->block_count);

	return 1;
}

static void read_from_buf(struct saa6588 *s, struct rds_command *a)
{
	unsigned long flags;

	unsigned char __user *buf_ptr = a->buffer;
	unsigned int i;
	unsigned int rd_blocks;

	a->result = 0;
	if (!a->buffer)
		return;

	while (!s->data_available_for_read) {
		int ret = wait_event_interruptible(s->read_queue,
					     s->data_available_for_read);
		if (ret == -ERESTARTSYS) {
			a->result = -EINTR;
			return;
		}
	}

	spin_lock_irqsave(&s->lock, flags);
	rd_blocks = a->block_count;
	if (rd_blocks > s->block_count)
		rd_blocks = s->block_count;

	if (!rd_blocks) {
		spin_unlock_irqrestore(&s->lock, flags);
		return;
	}

	for (i = 0; i < rd_blocks; i++) {
		if (block_to_user_buf(s, buf_ptr)) {
			buf_ptr += 3;
			a->result++;
		} else
			break;
	}
	a->result *= 3;
	s->data_available_for_read = (s->block_count > 0);
	spin_unlock_irqrestore(&s->lock, flags);
}

static void block_to_buf(struct saa6588 *s, unsigned char *blockbuf)
{
	unsigned int i;

	if (debug > 3)
		dprintk(PREFIX "New block: ");

	for (i = 0; i < 3; ++i) {
		if (debug > 3)
			dprintk("0x%02x ", blockbuf[i]);
		s->buffer[s->wr_index] = blockbuf[i];
		s->wr_index++;
	}

	if (s->wr_index >= s->buf_size)
		s->wr_index = 0;

	if (s->wr_index == s->rd_index) {
		s->rd_index += 3;
		if (s->rd_index >= s->buf_size)
			s->rd_index = 0;
	} else
		s->block_count++;

	if (debug > 3)
		dprintk("%d blocks total.\n", s->block_count);
}

static void saa6588_i2c_poll(struct saa6588 *s)
{
	unsigned long flags;
	unsigned char tmpbuf[6];
	unsigned char blocknum;
	unsigned char tmp;

	/* Although we only need 3 bytes, we have to read at least 6.
	   SAA6588 returns garbage otherwise */
	if (6 != i2c_master_recv(s->client, &tmpbuf[0], 6)) {
		if (debug > 1)
			dprintk(PREFIX "read error!\n");
		return;
	}

	blocknum = tmpbuf[0] >> 5;
	if (blocknum == s->last_blocknum) {
		if (debug > 3)
			dprintk("Saw block %d again.\n", blocknum);
		return;
	}

	s->last_blocknum = blocknum;

	/*
	   Byte order according to v4l2 specification:

	   Byte 0: Least Significant Byte of RDS Block
	   Byte 1: Most Significant Byte of RDS Block
	   Byte 2 Bit 7: Error bit. Indicates that an uncorrectable error
	   occurred during reception of this block.
	   Bit 6: Corrected bit. Indicates that an error was
	   corrected for this data block.
	   Bits 5-3: Received Offset. Indicates the offset received
	   by the sync system.
	   Bits 2-0: Offset Name. Indicates the offset applied to this data.

	   SAA6588 byte order is Status-MSB-LSB, so we have to swap the
	   first and the last of the 3 bytes block.
	 */

	tmp = tmpbuf[2];
	tmpbuf[2] = tmpbuf[0];
	tmpbuf[0] = tmp;

	tmp = blocknum;
	tmp |= blocknum << 3;	/* Received offset == Offset Name (OK ?) */
	if ((tmpbuf[2] & 0x03) == 0x03)
		tmp |= 0x80;	/* uncorrectable error */
	else if ((tmpbuf[2] & 0x03) != 0x00)
		tmp |= 0x40;	/* corrected error */
	tmpbuf[2] = tmp;	/* Is this enough ? Should we also check other bits ? */

	spin_lock_irqsave(&s->lock, flags);
	block_to_buf(s, tmpbuf);
	spin_unlock_irqrestore(&s->lock, flags);
	s->data_available_for_read = 1;
	wake_up_interruptible(&s->read_queue);
}

static void saa6588_timer(unsigned long data)
{
	struct saa6588 *s = (struct saa6588 *)data;

	schedule_work(&s->work);
}

static void saa6588_work(struct work_struct *work)
{
	struct saa6588 *s = container_of(work, struct saa6588, work);

	saa6588_i2c_poll(s);
	mod_timer(&s->timer, jiffies + msecs_to_jiffies(20));
}

static int saa6588_configure(struct saa6588 *s)
{
	unsigned char buf[3];
	int rc;

	buf[0] = cSyncRestart;
	if (rbds)
		buf[0] |= cProcessingModeRBDS;

	buf[1] = cFlywheelDefault;
	switch (plvl) {
	case 0:
		buf[1] |= cPauseLevel_11mV;
		break;
	case 1:
		buf[1] |= cPauseLevel_17mV;
		break;
	case 2:
		buf[1] |= cPauseLevel_27mV;
		break;
	case 3:
		buf[1] |= cPauseLevel_43mV;
		break;
	default:		/* nothing */
		break;
	}

	buf[2] = cQualityDetectDefault | cSelectOscFreqON;

	switch (xtal) {
	case 0:
		buf[2] |= cOscFreq_4332kHz;
		break;
	case 1:
		buf[2] |= cOscFreq_8664kHz;
		break;
	case 2:
		buf[2] |= cOscFreq_12996kHz;
		break;
	case 3:
		buf[2] |= cOscFreq_17328kHz;
		break;
	default:		/* nothing */
		break;
	}

	dprintk(PREFIX "writing: 0w=0x%02x 1w=0x%02x 2w=0x%02x\n",
		buf[0], buf[1], buf[2]);

	rc = i2c_master_send(s->client, buf, 3);
	if (rc != 3)
		printk(PREFIX "i2c i/o error: rc == %d (should be 3)\n", rc);

	return 0;
}

/* ---------------------------------------------------------------------- */

static int saa6588_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct saa6588 *s;

	v4l_info(client, "saa6588 found @ 0x%x (%s)\n",
			client->addr << 1, client->adapter->name);

	s = kzalloc(sizeof(*s), GFP_KERNEL);
	if (s == NULL)
		return -ENOMEM;

	s->client = client;
	s->buf_size = bufblocks * 3;

	s->buffer = kmalloc(s->buf_size, GFP_KERNEL);
	if (s->buffer == NULL) {
		kfree(s);
		return -ENOMEM;
	}
	spin_lock_init(&s->lock);
	s->block_count = 0;
	s->wr_index = 0;
	s->rd_index = 0;
	s->last_blocknum = 0xff;
	init_waitqueue_head(&s->read_queue);
	s->data_available_for_read = 0;
	i2c_set_clientdata(client, s);

	saa6588_configure(s);

	/* start polling via eventd */
	INIT_WORK(&s->work, saa6588_work);
	init_timer(&s->timer);
	s->timer.function = saa6588_timer;
	s->timer.data = (unsigned long)s;
	schedule_work(&s->work);
	return 0;
}

static int saa6588_remove(struct i2c_client *client)
{
	struct saa6588 *s = i2c_get_clientdata(client);

	del_timer_sync(&s->timer);
	flush_scheduled_work();

	kfree(s->buffer);
	kfree(s);
	return 0;
}

static int saa6588_command(struct i2c_client *client, unsigned int cmd,
							void *arg)
{
	struct saa6588 *s = i2c_get_clientdata(client);
	struct rds_command *a = (struct rds_command *)arg;

	switch (cmd) {
		/* --- open() for /dev/radio --- */
	case RDS_CMD_OPEN:
		a->result = 0;	/* return error if chip doesn't work ??? */
		break;
		/* --- close() for /dev/radio --- */
	case RDS_CMD_CLOSE:
		s->data_available_for_read = 1;
		wake_up_interruptible(&s->read_queue);
		a->result = 0;
		break;
		/* --- read() for /dev/radio --- */
	case RDS_CMD_READ:
		read_from_buf(s, a);
		break;
		/* --- poll() for /dev/radio --- */
	case RDS_CMD_POLL:
		a->result = 0;
		if (s->data_available_for_read) {
			a->result |= POLLIN | POLLRDNORM;
		}
		poll_wait(a->instance, &s->read_queue, a->event_list);
		break;

	default:
		/* nothing */
		break;
	}
	return 0;
}

/* ----------------------------------------------------------------------- */

static const struct i2c_device_id saa6588_id[] = {
	{ "saa6588", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, saa6588_id);

static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "saa6588",
	.command = saa6588_command,
	.probe = saa6588_probe,
	.remove = saa6588_remove,
	.legacy_class = I2C_CLASS_TV_ANALOG,
	.id_table = saa6588_id,
};
Commit	Line	Data
10b89ee3 MCC	1	/*
	2	Driver for SAA6588 RDS decoder
	3
	4	(c) 2005 Hans J. Koch
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	19	*/
	20
	21
	22	#include <linux/module.h>
	23	#include <linux/kernel.h>
	24	#include <linux/i2c.h>
	25	#include <linux/types.h>
	26	#include <linux/videodev.h>
	27	#include <linux/init.h>
	28	#include <linux/errno.h>
	29	#include <linux/slab.h>
	30	#include <linux/poll.h>
	31	#include <linux/wait.h>
	32	#include <asm/uaccess.h>
	33
fa3fcceb	34	#include <media/rds.h>
b5ffc223 HV	35	#include <media/v4l2-common.h>
b5ffc223 HV	36	#include <media/v4l2-i2c-drv-legacy.h>
10b89ee3 MCC	37
	38	/* Addresses to scan */
	39	static unsigned short normal_i2c[] = {
	40	0x20 >> 1,
	41	0x22 >> 1,
	42	I2C_CLIENT_END,
	43	};
	44
	45	I2C_CLIENT_INSMOD;
	46
	47	/* insmod options */
ff699e6b DSL	48	static unsigned int debug;
	49	static unsigned int xtal;
	50	static unsigned int rbds;
	51	static unsigned int plvl;
10b89ee3 MCC	52	static unsigned int bufblocks = 100;
10b89ee3 MCC	53
9b565eb7	54	module_param(debug, int, 0644);
10b89ee3	55	MODULE_PARM_DESC(debug, "enable debug messages");
9b565eb7	56	module_param(xtal, int, 0);
10b89ee3	57	MODULE_PARM_DESC(xtal, "select oscillator frequency (0..3), default 0");
9b565eb7	58	module_param(rbds, int, 0);
10b89ee3	59	MODULE_PARM_DESC(rbds, "select mode, 0=RDS, 1=RBDS, default 0");
9b565eb7	60	module_param(plvl, int, 0);
10b89ee3	61	MODULE_PARM_DESC(plvl, "select pause level (0..3), default 0");
9b565eb7	62	module_param(bufblocks, int, 0);
10b89ee3 MCC	63	MODULE_PARM_DESC(bufblocks, "number of buffered blocks, default 100");
	64
	65	MODULE_DESCRIPTION("v4l2 driver module for SAA6588 RDS decoder");
	66	MODULE_AUTHOR("Hans J. Koch <koch@hjk-az.de>");
	67
	68	MODULE_LICENSE("GPL");
	69
	70	/* ---------------------------------------------------------------------- */
	71
	72	#define UNSET (-1U)
	73	#define PREFIX "saa6588: "
	74	#define dprintk if (debug) printk
	75
	76	struct saa6588 {
b5ffc223	77	struct i2c_client *client;
10b89ee3 MCC	78	struct work_struct work;
	79	struct timer_list timer;
	80	spinlock_t lock;
	81	unsigned char *buffer;
	82	unsigned int buf_size;
	83	unsigned int rd_index;
	84	unsigned int wr_index;
	85	unsigned int block_count;
	86	unsigned char last_blocknum;
	87	wait_queue_head_t read_queue;
	88	int data_available_for_read;
	89	};
	90
10b89ee3 MCC	91	/* ---------------------------------------------------------------------- */
	92
	93	/*
	94	* SAA6588 defines
	95	*/
	96
	97	/* Initialization and mode control byte (0w) */
	98
	99	/* bit 0+1 (DAC0/DAC1) */
	100	#define cModeStandard 0x00
	101	#define cModeFastPI 0x01
	102	#define cModeReducedRequest 0x02
	103	#define cModeInvalid 0x03
	104
	105	/* bit 2 (RBDS) */
	106	#define cProcessingModeRDS 0x00
	107	#define cProcessingModeRBDS 0x04
	108
	109	/* bit 3+4 (SYM0/SYM1) */
	110	#define cErrCorrectionNone 0x00
	111	#define cErrCorrection2Bits 0x08
	112	#define cErrCorrection5Bits 0x10
	113	#define cErrCorrectionNoneRBDS 0x18
	114
	115	/* bit 5 (NWSY) */
	116	#define cSyncNormal 0x00
	117	#define cSyncRestart 0x20
	118
	119	/* bit 6 (TSQD) */
	120	#define cSigQualityDetectOFF 0x00
	121	#define cSigQualityDetectON 0x40
	122
	123	/* bit 7 (SQCM) */
	124	#define cSigQualityTriggered 0x00
	125	#define cSigQualityContinous 0x80
	126
	127	/* Pause level and flywheel control byte (1w) */
	128
	129	/* bits 0..5 (FEB0..FEB5) */
	130	#define cFlywheelMaxBlocksMask 0x3F
	131	#define cFlywheelDefault 0x20
	132
	133	/* bits 6+7 (PL0/PL1) */
	134	#define cPauseLevel_11mV 0x00
	135	#define cPauseLevel_17mV 0x40
	136	#define cPauseLevel_27mV 0x80
	137	#define cPauseLevel_43mV 0xC0
	138
	139	/* Pause time/oscillator frequency/quality detector control byte (1w) */
	140
	141	/* bits 0..4 (SQS0..SQS4) */
	142	#define cQualityDetectSensMask 0x1F
	143	#define cQualityDetectDefault 0x0F
	144
	145	/* bit 5 (SOSC) */
	146	#define cSelectOscFreqOFF 0x00
	147	#define cSelectOscFreqON 0x20
	148
	149	/* bit 6+7 (PTF0/PTF1) */
	150	#define cOscFreq_4332kHz 0x00
	151	#define cOscFreq_8664kHz 0x40
	152	#define cOscFreq_12996kHz 0x80
	153	#define cOscFreq_17328kHz 0xC0
	154
155	/* ---------------------------------------------------------------------- */
156
ae8aed03	157	static int block_to_user_buf(struct saa6588 s, unsigned char __user user_buf)
10b89ee3 MCC	158	{
	159	int i;
	160
	161	if (s->rd_index == s->wr_index) {
	162	if (debug > 2)
	163	dprintk(PREFIX "Read: buffer empty.\n");
	164	return 0;
	165	}
	166
	167	if (debug > 2) {
	168	dprintk(PREFIX "Read: ");
	169	for (i = s->rd_index; i < s->rd_index + 3; i++)
	170	dprintk("0x%02x ", s->buffer[i]);
	171	}
	172
	173	if (copy_to_user(user_buf, &s->buffer[s->rd_index], 3))
	174	return -EFAULT;
	175
	176	s->rd_index += 3;
	177	if (s->rd_index >= s->buf_size)
	178	s->rd_index = 0;
	179	s->block_count--;
	180
	181	if (debug > 2)
	182	dprintk("%d blocks total.\n", s->block_count);
	183
	184	return 1;
	185	}
	186
	187	static void read_from_buf(struct saa6588 s, struct rds_command a)
	188	{
	189	unsigned long flags;
	190
ae8aed03	191	unsigned char __user *buf_ptr = a->buffer;
10b89ee3 MCC	192	unsigned int i;
	193	unsigned int rd_blocks;
	194
	195	a->result = 0;
	196	if (!a->buffer)
	197	return;
	198
	199	while (!s->data_available_for_read) {
	200	int ret = wait_event_interruptible(s->read_queue,
	201	s->data_available_for_read);
	202	if (ret == -ERESTARTSYS) {
	203	a->result = -EINTR;
	204	return;
	205	}
	206	}
	207
	208	spin_lock_irqsave(&s->lock, flags);
	209	rd_blocks = a->block_count;
	210	if (rd_blocks > s->block_count)
	211	rd_blocks = s->block_count;
	212
a5bbc7d9 IS	213	if (!rd_blocks) {
a5bbc7d9 IS	214	spin_unlock_irqrestore(&s->lock, flags);
10b89ee3	215	return;
a5bbc7d9	216	}
10b89ee3 MCC	217
	218	for (i = 0; i < rd_blocks; i++) {
	219	if (block_to_user_buf(s, buf_ptr)) {
	220	buf_ptr += 3;
	221	a->result++;
	222	} else
	223	break;
	224	}
	225	a->result *= 3;
	226	s->data_available_for_read = (s->block_count > 0);
	227	spin_unlock_irqrestore(&s->lock, flags);
	228	}
	229
	230	static void block_to_buf(struct saa6588 s, unsigned char blockbuf)
	231	{
	232	unsigned int i;
	233
	234	if (debug > 3)
	235	dprintk(PREFIX "New block: ");
	236
	237	for (i = 0; i < 3; ++i) {
	238	if (debug > 3)
	239	dprintk("0x%02x ", blockbuf[i]);
	240	s->buffer[s->wr_index] = blockbuf[i];
	241	s->wr_index++;
	242	}
	243
	244	if (s->wr_index >= s->buf_size)
	245	s->wr_index = 0;
	246
	247	if (s->wr_index == s->rd_index) {
6c3d67ab	248	s->rd_index += 3;
10b89ee3 MCC	249	if (s->rd_index >= s->buf_size)
	250	s->rd_index = 0;
	251	} else
	252	s->block_count++;
	253
	254	if (debug > 3)
	255	dprintk("%d blocks total.\n", s->block_count);
	256	}
	257
	258	static void saa6588_i2c_poll(struct saa6588 *s)
	259	{
	260	unsigned long flags;
	261	unsigned char tmpbuf[6];
	262	unsigned char blocknum;
	263	unsigned char tmp;
	264
	265	/* Although we only need 3 bytes, we have to read at least 6.
	266	SAA6588 returns garbage otherwise */
b5ffc223	267	if (6 != i2c_master_recv(s->client, &tmpbuf[0], 6)) {
10b89ee3 MCC	268	if (debug > 1)
	269	dprintk(PREFIX "read error!\n");
	270	return;
	271	}
	272
	273	blocknum = tmpbuf[0] >> 5;
	274	if (blocknum == s->last_blocknum) {
	275	if (debug > 3)
	276	dprintk("Saw block %d again.\n", blocknum);
	277	return;
	278	}
	279
	280	s->last_blocknum = blocknum;
	281
	282	/*
	283	Byte order according to v4l2 specification:
	284
	285	Byte 0: Least Significant Byte of RDS Block
	286	Byte 1: Most Significant Byte of RDS Block
	287	Byte 2 Bit 7: Error bit. Indicates that an uncorrectable error
	288	occurred during reception of this block.
	289	Bit 6: Corrected bit. Indicates that an error was
	290	corrected for this data block.
	291	Bits 5-3: Received Offset. Indicates the offset received
	292	by the sync system.
	293	Bits 2-0: Offset Name. Indicates the offset applied to this data.
	294
	295	SAA6588 byte order is Status-MSB-LSB, so we have to swap the
	296	first and the last of the 3 bytes block.
	297	*/
	298
	299	tmp = tmpbuf[2];
	300	tmpbuf[2] = tmpbuf[0];
	301	tmpbuf[0] = tmp;
	302
	303	tmp = blocknum;
	304	tmp \|= blocknum << 3; /* Received offset == Offset Name (OK ?) */
	305	if ((tmpbuf[2] & 0x03) == 0x03)
	306	tmp \|= 0x80; /* uncorrectable error */
	307	else if ((tmpbuf[2] & 0x03) != 0x00)
	308	tmp \|= 0x40; /* corrected error */
	309	tmpbuf[2] = tmp; /* Is this enough ? Should we also check other bits ? */
	310
	311	spin_lock_irqsave(&s->lock, flags);
	312	block_to_buf(s, tmpbuf);
	313	spin_unlock_irqrestore(&s->lock, flags);
	314	s->data_available_for_read = 1;
	315	wake_up_interruptible(&s->read_queue);
	316	}
	317
	318	static void saa6588_timer(unsigned long data)
	319	{
	320	struct saa6588 s = (struct saa6588 )data;
	321
	322	schedule_work(&s->work);
	323	}
	324
c4028958	325	static void saa6588_work(struct work_struct *work)
10b89ee3	326	{
c4028958	327	struct saa6588 *s = container_of(work, struct saa6588, work);
10b89ee3 MCC	328
10b89ee3 MCC	329	saa6588_i2c_poll(s);
e222f834	330	mod_timer(&s->timer, jiffies + msecs_to_jiffies(20));
10b89ee3 MCC	331	}
	332
	333	static int saa6588_configure(struct saa6588 *s)
	334	{
	335	unsigned char buf[3];
	336	int rc;
	337
	338	buf[0] = cSyncRestart;
	339	if (rbds)
	340	buf[0] \|= cProcessingModeRBDS;
	341
	342	buf[1] = cFlywheelDefault;
	343	switch (plvl) {
	344	case 0:
	345	buf[1] \|= cPauseLevel_11mV;
	346	break;
	347	case 1:
	348	buf[1] \|= cPauseLevel_17mV;
	349	break;
	350	case 2:
	351	buf[1] \|= cPauseLevel_27mV;
	352	break;
	353	case 3:
	354	buf[1] \|= cPauseLevel_43mV;
	355	break;
	356	default: /* nothing */
	357	break;
	358	}
	359
	360	buf[2] = cQualityDetectDefault \| cSelectOscFreqON;
	361
	362	switch (xtal) {
	363	case 0:
	364	buf[2] \|= cOscFreq_4332kHz;
	365	break;
	366	case 1:
	367	buf[2] \|= cOscFreq_8664kHz;
	368	break;
	369	case 2:
	370	buf[2] \|= cOscFreq_12996kHz;
	371	break;
	372	case 3:
	373	buf[2] \|= cOscFreq_17328kHz;
	374	break;
	375	default: /* nothing */
	376	break;
	377	}
	378
	379	dprintk(PREFIX "writing: 0w=0x%02x 1w=0x%02x 2w=0x%02x\n",
	380	buf[0], buf[1], buf[2]);
	381
b5ffc223 HV	382	rc = i2c_master_send(s->client, buf, 3);
b5ffc223 HV	383	if (rc != 3)
10b89ee3 MCC	384	printk(PREFIX "i2c i/o error: rc == %d (should be 3)\n", rc);
	385
	386	return 0;
	387	}
	388
	389	/* ---------------------------------------------------------------------- */
	390
b5ffc223 HV	391	static int saa6588_probe(struct i2c_client *client,
b5ffc223 HV	392	const struct i2c_device_id *id)
10b89ee3 MCC	393	{
10b89ee3 MCC	394	struct saa6588 *s;
10b89ee3	395
b5ffc223 HV	396	v4l_info(client, "saa6588 found @ 0x%x (%s)\n",
b5ffc223 HV	397	client->addr << 1, client->adapter->name);
10b89ee3	398
b5ffc223 HV	399	s = kzalloc(sizeof(*s), GFP_KERNEL);
b5ffc223 HV	400	if (s == NULL)
10b89ee3 MCC	401	return -ENOMEM;
10b89ee3 MCC	402
b5ffc223	403	s->client = client;
10b89ee3 MCC	404	s->buf_size = bufblocks * 3;
10b89ee3 MCC	405
b5ffc223 HV	406	s->buffer = kmalloc(s->buf_size, GFP_KERNEL);
b5ffc223 HV	407	if (s->buffer == NULL) {
10b89ee3 MCC	408	kfree(s);
	409	return -ENOMEM;
	410	}
588005e1	411	spin_lock_init(&s->lock);
10b89ee3 MCC	412	s->block_count = 0;
	413	s->wr_index = 0;
	414	s->rd_index = 0;
	415	s->last_blocknum = 0xff;
	416	init_waitqueue_head(&s->read_queue);
	417	s->data_available_for_read = 0;
b5ffc223	418	i2c_set_clientdata(client, s);
10b89ee3 MCC	419
	420	saa6588_configure(s);
	421
	422	/* start polling via eventd */
c4028958	423	INIT_WORK(&s->work, saa6588_work);
10b89ee3 MCC	424	init_timer(&s->timer);
	425	s->timer.function = saa6588_timer;
	426	s->timer.data = (unsigned long)s;
	427	schedule_work(&s->work);
10b89ee3 MCC	428	return 0;
	429	}
	430
b5ffc223	431	static int saa6588_remove(struct i2c_client *client)
10b89ee3 MCC	432	{
	433	struct saa6588 *s = i2c_get_clientdata(client);
	434
	435	del_timer_sync(&s->timer);
	436	flush_scheduled_work();
	437
10b89ee3 MCC	438	kfree(s->buffer);
	439	kfree(s);
	440	return 0;
	441	}
	442
	443	static int saa6588_command(struct i2c_client *client, unsigned int cmd,
	444	void *arg)
	445	{
	446	struct saa6588 *s = i2c_get_clientdata(client);
	447	struct rds_command a = (struct rds_command )arg;
	448
	449	switch (cmd) {
	450	/* --- open() for /dev/radio --- */
	451	case RDS_CMD_OPEN:
	452	a->result = 0; /* return error if chip doesn't work ??? */
	453	break;
	454	/* --- close() for /dev/radio --- */
	455	case RDS_CMD_CLOSE:
	456	s->data_available_for_read = 1;
	457	wake_up_interruptible(&s->read_queue);
	458	a->result = 0;
	459	break;
	460	/* --- read() for /dev/radio --- */
	461	case RDS_CMD_READ:
	462	read_from_buf(s, a);
	463	break;
	464	/* --- poll() for /dev/radio --- */
	465	case RDS_CMD_POLL:
	466	a->result = 0;
	467	if (s->data_available_for_read) {
	468	a->result \|= POLLIN \| POLLRDNORM;
	469	}
	470	poll_wait(a->instance, &s->read_queue, a->event_list);
	471	break;
	472
	473	default:
	474	/* nothing */
	475	break;
	476	}
	477	return 0;
	478	}
	479
	480	/* ----------------------------------------------------------------------- */
	481
b5ffc223 HV	482	static const struct i2c_device_id saa6588_id[] = {
	483	{ "saa6588", 0 },
	484	{ }
10b89ee3	485	};
b5ffc223	486	MODULE_DEVICE_TABLE(i2c, saa6588_id);
10b89ee3	487
b5ffc223	488	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
10b89ee3	489	.name = "saa6588",
b5ffc223 HV	490	.command = saa6588_command,
	491	.probe = saa6588_probe,
	492	.remove = saa6588_remove,
	493	.legacy_class = I2C_CLASS_TV_ANALOG,
	494	.id_table = saa6588_id,
10b89ee3	495	};