[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / video / au0828 / au0828-i2c.c

/*
 *  Driver for the Auvitek AU0828 USB bridge
 *
 *  Copyright (c) 2008 Steven Toth <stoth@linuxtv.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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/io.h>

#include "au0828.h"

#include <media/v4l2-common.h>

static int i2c_scan;
module_param(i2c_scan, int, 0444);
MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");

#define I2C_WAIT_DELAY 512
#define I2C_WAIT_RETRY 64

static inline int i2c_slave_did_write_ack(struct i2c_adapter *i2c_adap)
{
	struct au0828_dev *dev = i2c_adap->algo_data;
	return au0828_read(dev, AU0828_I2C_STATUS_201) &
		AU0828_I2C_STATUS_NO_WRITE_ACK ? 0 : 1;
}

static inline int i2c_slave_did_read_ack(struct i2c_adapter *i2c_adap)
{
	struct au0828_dev *dev = i2c_adap->algo_data;
	return au0828_read(dev, AU0828_I2C_STATUS_201) &
		AU0828_I2C_STATUS_NO_READ_ACK ? 0 : 1;
}

static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap)
{
	int count;

	for (count = 0; count < I2C_WAIT_RETRY; count++) {
		if (!i2c_slave_did_read_ack(i2c_adap))
			break;
		udelay(I2C_WAIT_DELAY);
	}

	if (I2C_WAIT_RETRY == count)
		return 0;

	return 1;
}

static inline int i2c_is_read_busy(struct i2c_adapter *i2c_adap)
{
	struct au0828_dev *dev = i2c_adap->algo_data;
	return au0828_read(dev, AU0828_I2C_STATUS_201) &
		AU0828_I2C_STATUS_READ_DONE ? 0 : 1;
}

static int i2c_wait_read_done(struct i2c_adapter *i2c_adap)
{
	int count;

	for (count = 0; count < I2C_WAIT_RETRY; count++) {
		if (!i2c_is_read_busy(i2c_adap))
			break;
		udelay(I2C_WAIT_DELAY);
	}

	if (I2C_WAIT_RETRY == count)
		return 0;

	return 1;
}

static inline int i2c_is_write_done(struct i2c_adapter *i2c_adap)
{
	struct au0828_dev *dev = i2c_adap->algo_data;
	return au0828_read(dev, AU0828_I2C_STATUS_201) &
		AU0828_I2C_STATUS_WRITE_DONE ? 1 : 0;
}

static int i2c_wait_write_done(struct i2c_adapter *i2c_adap)
{
	int count;

	for (count = 0; count < I2C_WAIT_RETRY; count++) {
		if (i2c_is_write_done(i2c_adap))
			break;
		udelay(I2C_WAIT_DELAY);
	}

	if (I2C_WAIT_RETRY == count)
		return 0;

	return 1;
}

static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
{
	struct au0828_dev *dev = i2c_adap->algo_data;
	return au0828_read(dev, AU0828_I2C_STATUS_201) &
		AU0828_I2C_STATUS_BUSY ? 1 : 0;
}

static int i2c_wait_done(struct i2c_adapter *i2c_adap)
{
	int count;

	for (count = 0; count < I2C_WAIT_RETRY; count++) {
		if (!i2c_is_busy(i2c_adap))
			break;
		udelay(I2C_WAIT_DELAY);
	}

	if (I2C_WAIT_RETRY == count)
		return 0;

	return 1;
}

/* FIXME: Implement join handling correctly */
static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
	const struct i2c_msg *msg, int joined_rlen)
{
	int i, strobe = 0;
	struct au0828_dev *dev = i2c_adap->algo_data;

	dprintk(4, "%s()\n", __func__);

	au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);

	/* Set the I2C clock */
	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
		     dev->board.i2c_clk_divider);

	/* Hardware needs 8 bit addresses */
	au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);

	dprintk(4, "SEND: %02x\n", msg->addr);

	/* Deal with i2c_scan */
	if (msg->len == 0) {
		/* The analog tuner detection code makes use of the SMBUS_QUICK
		   message (which involves a zero length i2c write).  To avoid
		   checking the status register when we didn't strobe out any
		   actual bytes to the bus, just do a read check.  This is
		   consistent with how I saw i2c device checking done in the
		   USB trace of the Windows driver */
		au0828_write(dev, AU0828_I2C_TRIGGER_200,
			     AU0828_I2C_TRIGGER_READ);

		if (!i2c_wait_done(i2c_adap))
			return -EIO;

		if (i2c_wait_read_ack(i2c_adap))
			return -EIO;

		return 0;
	}

	for (i = 0; i < msg->len;) {

		dprintk(4, " %02x\n", msg->buf[i]);

		au0828_write(dev, AU0828_I2C_WRITE_FIFO_205, msg->buf[i]);

		strobe++;
		i++;

		if ((strobe >= 4) || (i >= msg->len)) {

			/* Strobe the byte into the bus */
			if (i < msg->len)
				au0828_write(dev, AU0828_I2C_TRIGGER_200,
					     AU0828_I2C_TRIGGER_WRITE |
					     AU0828_I2C_TRIGGER_HOLD);
			else
				au0828_write(dev, AU0828_I2C_TRIGGER_200,
					     AU0828_I2C_TRIGGER_WRITE);

			/* Reset strobe trigger */
			strobe = 0;

			if (!i2c_wait_write_done(i2c_adap))
				return -EIO;

		}

	}
	if (!i2c_wait_done(i2c_adap))
		return -EIO;

	dprintk(4, "\n");

	return msg->len;
}

/* FIXME: Implement join handling correctly */
static int i2c_readbytes(struct i2c_adapter *i2c_adap,
	const struct i2c_msg *msg, int joined)
{
	struct au0828_dev *dev = i2c_adap->algo_data;
	int i;

	dprintk(4, "%s()\n", __func__);

	au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);

	/* Set the I2C clock */
	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
		     dev->board.i2c_clk_divider);

	/* Hardware needs 8 bit addresses */
	au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);

	dprintk(4, " RECV:\n");

	/* Deal with i2c_scan */
	if (msg->len == 0) {
		au0828_write(dev, AU0828_I2C_TRIGGER_200,
			     AU0828_I2C_TRIGGER_READ);

		if (i2c_wait_read_ack(i2c_adap))
			return -EIO;
		return 0;
	}

	for (i = 0; i < msg->len;) {

		i++;

		if (i < msg->len)
			au0828_write(dev, AU0828_I2C_TRIGGER_200,
				     AU0828_I2C_TRIGGER_READ |
				     AU0828_I2C_TRIGGER_HOLD);
		else
			au0828_write(dev, AU0828_I2C_TRIGGER_200,
				     AU0828_I2C_TRIGGER_READ);

		if (!i2c_wait_read_done(i2c_adap))
			return -EIO;

		msg->buf[i-1] = au0828_read(dev, AU0828_I2C_READ_FIFO_209) &
			0xff;

		dprintk(4, " %02x\n", msg->buf[i-1]);
	}
	if (!i2c_wait_done(i2c_adap))
		return -EIO;

	dprintk(4, "\n");

	return msg->len;
}

static int i2c_xfer(struct i2c_adapter *i2c_adap,
		    struct i2c_msg *msgs, int num)
{
	int i, retval = 0;

	dprintk(4, "%s(num = %d)\n", __func__, num);

	for (i = 0; i < num; i++) {
		dprintk(4, "%s(num = %d) addr = 0x%02x  len = 0x%x\n",
			__func__, num, msgs[i].addr, msgs[i].len);
		if (msgs[i].flags & I2C_M_RD) {
			/* read */
			retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
		} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
			   msgs[i].addr == msgs[i + 1].addr) {
			/* write then read from same address */
			retval = i2c_sendbytes(i2c_adap, &msgs[i],
					       msgs[i + 1].len);
			if (retval < 0)
				goto err;
			i++;
			retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
		} else {
			/* write */
			retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
		}
		if (retval < 0)
			goto err;
	}
	return num;

err:
	return retval;
}

static u32 au0828_functionality(struct i2c_adapter *adap)
{
	return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
}

static struct i2c_algorithm au0828_i2c_algo_template = {
	.master_xfer	= i2c_xfer,
	.functionality	= au0828_functionality,
};

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

static struct i2c_adapter au0828_i2c_adap_template = {
	.name              = DRIVER_NAME,
	.owner             = THIS_MODULE,
	.algo              = &au0828_i2c_algo_template,
};

static struct i2c_client au0828_i2c_client_template = {
	.name	= "au0828 internal",
};

static char *i2c_devs[128] = {
	[0x8e >> 1] = "au8522",
	[0xa0 >> 1] = "eeprom",
	[0xc2 >> 1] = "tuner/xc5000",
};

static void do_i2c_scan(char *name, struct i2c_client *c)
{
	unsigned char buf;
	int i, rc;

	for (i = 0; i < 128; i++) {
		c->addr = i;
		rc = i2c_master_recv(c, &buf, 0);
		if (rc < 0)
			continue;
		printk(KERN_INFO "%s: i2c scan: found device @ 0x%x  [%s]\n",
		       name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
	}
}

/* init + register i2c algo-bit adapter */
int au0828_i2c_register(struct au0828_dev *dev)
{
	dprintk(1, "%s()\n", __func__);

	memcpy(&dev->i2c_adap, &au0828_i2c_adap_template,
	       sizeof(dev->i2c_adap));
	memcpy(&dev->i2c_algo, &au0828_i2c_algo_template,
	       sizeof(dev->i2c_algo));
	memcpy(&dev->i2c_client, &au0828_i2c_client_template,
	       sizeof(dev->i2c_client));

	dev->i2c_adap.dev.parent = &dev->usbdev->dev;

	strlcpy(dev->i2c_adap.name, DRIVER_NAME,
		sizeof(dev->i2c_adap.name));

	dev->i2c_adap.algo = &dev->i2c_algo;
	dev->i2c_adap.algo_data = dev;
	i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
	i2c_add_adapter(&dev->i2c_adap);

	dev->i2c_client.adapter = &dev->i2c_adap;

	if (0 == dev->i2c_rc) {
		printk(KERN_INFO "%s: i2c bus registered\n", DRIVER_NAME);
		if (i2c_scan)
			do_i2c_scan(DRIVER_NAME, &dev->i2c_client);
	} else
		printk(KERN_INFO "%s: i2c bus register FAILED\n", DRIVER_NAME);

	return dev->i2c_rc;
}

int au0828_i2c_unregister(struct au0828_dev *dev)
{
	i2c_del_adapter(&dev->i2c_adap);
	return 0;
}
Commit	Line	Data
265a6510 ST	1	/*
	2	* Driver for the Auvitek AU0828 USB bridge
	3	*
6d897616	4	* Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
265a6510 ST	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	*
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
	22	#include <linux/module.h>
	23	#include <linux/moduleparam.h>
	24	#include <linux/init.h>
	25	#include <linux/delay.h>
18d73c58	26	#include <linux/io.h>
265a6510 ST	27
	28	#include "au0828.h"
	29
	30	#include <media/v4l2-common.h>
	31
b33d24c4	32	static int i2c_scan;
265a6510 ST	33	module_param(i2c_scan, int, 0444);
	34	MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
	35
265a6510 ST	36	#define I2C_WAIT_DELAY 512
	37	#define I2C_WAIT_RETRY 64
	38
	39	static inline int i2c_slave_did_write_ack(struct i2c_adapter *i2c_adap)
	40	{
	41	struct au0828_dev *dev = i2c_adap->algo_data;
9beb0de9 DH	42	return au0828_read(dev, AU0828_I2C_STATUS_201) &
9beb0de9 DH	43	AU0828_I2C_STATUS_NO_WRITE_ACK ? 0 : 1;
265a6510 ST	44	}
	45
	46	static inline int i2c_slave_did_read_ack(struct i2c_adapter *i2c_adap)
	47	{
	48	struct au0828_dev *dev = i2c_adap->algo_data;
9beb0de9 DH	49	return au0828_read(dev, AU0828_I2C_STATUS_201) &
9beb0de9 DH	50	AU0828_I2C_STATUS_NO_READ_ACK ? 0 : 1;
265a6510 ST	51	}
	52
	53	static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap)
	54	{
	55	int count;
	56
	57	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	58	if (!i2c_slave_did_read_ack(i2c_adap))
	59	break;
	60	udelay(I2C_WAIT_DELAY);
	61	}
	62
	63	if (I2C_WAIT_RETRY == count)
	64	return 0;
	65
	66	return 1;
	67	}
	68
	69	static inline int i2c_is_read_busy(struct i2c_adapter *i2c_adap)
	70	{
	71	struct au0828_dev *dev = i2c_adap->algo_data;
9beb0de9 DH	72	return au0828_read(dev, AU0828_I2C_STATUS_201) &
9beb0de9 DH	73	AU0828_I2C_STATUS_READ_DONE ? 0 : 1;
265a6510 ST	74	}
	75
	76	static int i2c_wait_read_done(struct i2c_adapter *i2c_adap)
	77	{
	78	int count;
	79
	80	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	81	if (!i2c_is_read_busy(i2c_adap))
	82	break;
	83	udelay(I2C_WAIT_DELAY);
	84	}
	85
	86	if (I2C_WAIT_RETRY == count)
	87	return 0;
	88
	89	return 1;
	90	}
	91
	92	static inline int i2c_is_write_done(struct i2c_adapter *i2c_adap)
	93	{
	94	struct au0828_dev *dev = i2c_adap->algo_data;
9beb0de9 DH	95	return au0828_read(dev, AU0828_I2C_STATUS_201) &
9beb0de9 DH	96	AU0828_I2C_STATUS_WRITE_DONE ? 1 : 0;
265a6510 ST	97	}
	98
	99	static int i2c_wait_write_done(struct i2c_adapter *i2c_adap)
	100	{
	101	int count;
	102
	103	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	104	if (i2c_is_write_done(i2c_adap))
	105	break;
	106	udelay(I2C_WAIT_DELAY);
	107	}
	108
	109	if (I2C_WAIT_RETRY == count)
	110	return 0;
	111
	112	return 1;
	113	}
	114
	115	static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
	116	{
	117	struct au0828_dev *dev = i2c_adap->algo_data;
9beb0de9 DH	118	return au0828_read(dev, AU0828_I2C_STATUS_201) &
9beb0de9 DH	119	AU0828_I2C_STATUS_BUSY ? 1 : 0;
265a6510 ST	120	}
	121
	122	static int i2c_wait_done(struct i2c_adapter *i2c_adap)
	123	{
	124	int count;
	125
	126	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	127	if (!i2c_is_busy(i2c_adap))
	128	break;
	129	udelay(I2C_WAIT_DELAY);
	130	}
	131
	132	if (I2C_WAIT_RETRY == count)
	133	return 0;
	134
	135	return 1;
	136	}
	137
	138	/* FIXME: Implement join handling correctly */
	139	static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
	140	const struct i2c_msg *msg, int joined_rlen)
	141	{
	142	int i, strobe = 0;
	143	struct au0828_dev *dev = i2c_adap->algo_data;
	144
f07e8e4b	145	dprintk(4, "%s()\n", __func__);
265a6510	146
9beb0de9	147	au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
32c000ad	148
16af6f5a DH	149	/* Set the I2C clock */
	150	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
	151	dev->board.i2c_clk_divider);
265a6510 ST	152
265a6510 ST	153	/* Hardware needs 8 bit addresses */
9beb0de9	154	au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
265a6510	155
bc3c613c	156	dprintk(4, "SEND: %02x\n", msg->addr);
265a6510	157
dc8685b5 DH	158	/* Deal with i2c_scan */
	159	if (msg->len == 0) {
	160	/* The analog tuner detection code makes use of the SMBUS_QUICK
	161	message (which involves a zero length i2c write). To avoid
	162	checking the status register when we didn't strobe out any
	163	actual bytes to the bus, just do a read check. This is
	164	consistent with how I saw i2c device checking done in the
	165	USB trace of the Windows driver */
9beb0de9 DH	166	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	167	AU0828_I2C_TRIGGER_READ);
	168
dc8685b5 DH	169	if (!i2c_wait_done(i2c_adap))
	170	return -EIO;
	171
	172	if (i2c_wait_read_ack(i2c_adap))
	173	return -EIO;
	174
	175	return 0;
	176	}
	177
a9c36aad	178	for (i = 0; i < msg->len;) {
265a6510	179
bc3c613c	180	dprintk(4, " %02x\n", msg->buf[i]);
265a6510	181
9beb0de9	182	au0828_write(dev, AU0828_I2C_WRITE_FIFO_205, msg->buf[i]);
265a6510 ST	183
	184	strobe++;
	185	i++;
	186
	187	if ((strobe >= 4) \|\| (i >= msg->len)) {
	188
	189	/* Strobe the byte into the bus */
	190	if (i < msg->len)
9beb0de9 DH	191	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	192	AU0828_I2C_TRIGGER_WRITE \|
	193	AU0828_I2C_TRIGGER_HOLD);
265a6510	194	else
9beb0de9 DH	195	au0828_write(dev, AU0828_I2C_TRIGGER_200,
9beb0de9 DH	196	AU0828_I2C_TRIGGER_WRITE);
265a6510 ST	197
	198	/* Reset strobe trigger */
	199	strobe = 0;
	200
	201	if (!i2c_wait_write_done(i2c_adap))
	202	return -EIO;
	203
	204	}
	205
	206	}
	207	if (!i2c_wait_done(i2c_adap))
	208	return -EIO;
	209
bc3c613c	210	dprintk(4, "\n");
265a6510 ST	211
	212	return msg->len;
	213	}
	214
	215	/* FIXME: Implement join handling correctly */
	216	static int i2c_readbytes(struct i2c_adapter *i2c_adap,
	217	const struct i2c_msg *msg, int joined)
	218	{
	219	struct au0828_dev *dev = i2c_adap->algo_data;
	220	int i;
	221
f07e8e4b	222	dprintk(4, "%s()\n", __func__);
265a6510	223
9beb0de9	224	au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
32c000ad	225
16af6f5a DH	226	/* Set the I2C clock */
	227	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
	228	dev->board.i2c_clk_divider);
265a6510 ST	229
265a6510 ST	230	/* Hardware needs 8 bit addresses */
9beb0de9	231	au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
265a6510	232
bc3c613c	233	dprintk(4, " RECV:\n");
265a6510 ST	234
	235	/* Deal with i2c_scan */
	236	if (msg->len == 0) {
9beb0de9 DH	237	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	238	AU0828_I2C_TRIGGER_READ);
	239
265a6510 ST	240	if (i2c_wait_read_ack(i2c_adap))
	241	return -EIO;
	242	return 0;
	243	}
	244
a9c36aad	245	for (i = 0; i < msg->len;) {
265a6510 ST	246
	247	i++;
	248
	249	if (i < msg->len)
9beb0de9 DH	250	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	251	AU0828_I2C_TRIGGER_READ \|
	252	AU0828_I2C_TRIGGER_HOLD);
265a6510	253	else
9beb0de9 DH	254	au0828_write(dev, AU0828_I2C_TRIGGER_200,
9beb0de9 DH	255	AU0828_I2C_TRIGGER_READ);
265a6510 ST	256
	257	if (!i2c_wait_read_done(i2c_adap))
	258	return -EIO;
	259
9beb0de9 DH	260	msg->buf[i-1] = au0828_read(dev, AU0828_I2C_READ_FIFO_209) &
9beb0de9 DH	261	0xff;
265a6510	262
bc3c613c	263	dprintk(4, " %02x\n", msg->buf[i-1]);
265a6510 ST	264	}
	265	if (!i2c_wait_done(i2c_adap))
	266	return -EIO;
	267
bc3c613c	268	dprintk(4, "\n");
265a6510 ST	269
	270	return msg->len;
	271	}
	272
	273	static int i2c_xfer(struct i2c_adapter *i2c_adap,
	274	struct i2c_msg *msgs, int num)
	275	{
	276	int i, retval = 0;
	277
f07e8e4b	278	dprintk(4, "%s(num = %d)\n", __func__, num);
265a6510	279
a9c36aad	280	for (i = 0; i < num; i++) {
bc3c613c	281	dprintk(4, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
f07e8e4b	282	__func__, num, msgs[i].addr, msgs[i].len);
265a6510 ST	283	if (msgs[i].flags & I2C_M_RD) {
	284	/* read */
	285	retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
	286	} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
	287	msgs[i].addr == msgs[i + 1].addr) {
	288	/* write then read from same address */
	289	retval = i2c_sendbytes(i2c_adap, &msgs[i],
	290	msgs[i + 1].len);
	291	if (retval < 0)
	292	goto err;
	293	i++;
	294	retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
	295	} else {
	296	/* write */
	297	retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
	298	}
	299	if (retval < 0)
	300	goto err;
	301	}
	302	return num;
	303
	304	err:
	305	return retval;
	306	}
	307
265a6510 ST	308	static u32 au0828_functionality(struct i2c_adapter *adap)
	309	{
	310	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_I2C;
	311	}
	312
	313	static struct i2c_algorithm au0828_i2c_algo_template = {
	314	.master_xfer = i2c_xfer,
	315	.functionality = au0828_functionality,
	316	};
	317
	318	/* ----------------------------------------------------------------------- */
	319
	320	static struct i2c_adapter au0828_i2c_adap_template = {
	321	.name = DRIVER_NAME,
	322	.owner = THIS_MODULE,
265a6510	323	.algo = &au0828_i2c_algo_template,
265a6510 ST	324	};
	325
	326	static struct i2c_client au0828_i2c_client_template = {
	327	.name = "au0828 internal",
	328	};
	329
	330	static char *i2c_devs[128] = {
18d73c58 MCC	331	[0x8e >> 1] = "au8522",
	332	[0xa0 >> 1] = "eeprom",
	333	[0xc2 >> 1] = "tuner/xc5000",
265a6510 ST	334	};
	335
	336	static void do_i2c_scan(char name, struct i2c_client c)
	337	{
	338	unsigned char buf;
	339	int i, rc;
	340
	341	for (i = 0; i < 128; i++) {
	342	c->addr = i;
	343	rc = i2c_master_recv(c, &buf, 0);
	344	if (rc < 0)
	345	continue;
18d73c58	346	printk(KERN_INFO "%s: i2c scan: found device @ 0x%x [%s]\n",
265a6510 ST	347	name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
	348	}
	349	}
	350
	351	/* init + register i2c algo-bit adapter */
	352	int au0828_i2c_register(struct au0828_dev *dev)
	353	{
f07e8e4b	354	dprintk(1, "%s()\n", __func__);
265a6510 ST	355
	356	memcpy(&dev->i2c_adap, &au0828_i2c_adap_template,
	357	sizeof(dev->i2c_adap));
	358	memcpy(&dev->i2c_algo, &au0828_i2c_algo_template,
	359	sizeof(dev->i2c_algo));
	360	memcpy(&dev->i2c_client, &au0828_i2c_client_template,
	361	sizeof(dev->i2c_client));
	362
	363	dev->i2c_adap.dev.parent = &dev->usbdev->dev;
	364
	365	strlcpy(dev->i2c_adap.name, DRIVER_NAME,
	366	sizeof(dev->i2c_adap.name));
	367
b14667f3	368	dev->i2c_adap.algo = &dev->i2c_algo;
265a6510	369	dev->i2c_adap.algo_data = dev;
b14667f3	370	i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
265a6510 ST	371	i2c_add_adapter(&dev->i2c_adap);
	372
	373	dev->i2c_client.adapter = &dev->i2c_adap;
	374
	375	if (0 == dev->i2c_rc) {
18d73c58	376	printk(KERN_INFO "%s: i2c bus registered\n", DRIVER_NAME);
265a6510 ST	377	if (i2c_scan)
	378	do_i2c_scan(DRIVER_NAME, &dev->i2c_client);
	379	} else
18d73c58	380	printk(KERN_INFO "%s: i2c bus register FAILED\n", DRIVER_NAME);
bc3c613c	381
265a6510 ST	382	return dev->i2c_rc;
	383	}
	384
	385	int au0828_i2c_unregister(struct au0828_dev *dev)
	386	{
	387	i2c_del_adapter(&dev->i2c_adap);
	388	return 0;
	389	}
	390