[mirror_ubuntu-artful-kernel.git] / drivers / media / usb / 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.
 */

#include "au0828.h"

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

#include "media/tuner.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 25
#define I2C_WAIT_RETRY 1000

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;
	u8 i2c_speed = dev->board.i2c_clk_divider;

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

	au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);

	if (((dev->board.tuner_type == TUNER_XC5000) ||
	     (dev->board.tuner_type == TUNER_XC5000C)) &&
	    (dev->board.tuner_addr == msg->addr)) {
		/*
		 * Due to I2C clock stretch, we need to use a lower speed
		 * on xc5000 for commands. However, firmware transfer can
		 * speed up to 400 KHz.
		 */
		if (msg->len == 64)
			i2c_speed = AU0828_I2C_CLK_250KHZ;
		else
			i2c_speed = AU0828_I2C_CLK_20KHZ;
	}
	/* Set the I2C clock */
	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, i2c_speed);

	/* 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;
	u8 i2c_speed = dev->board.i2c_clk_divider;
	int i;

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

	au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);

	/*
	 * Due to xc5000c clock stretch, we cannot use full speed at
	 * readings from xc5000, as otherwise they'll fail.
	 */
	if (((dev->board.tuner_type == TUNER_XC5000) ||
	     (dev->board.tuner_type == TUNER_XC5000C)) &&
	    (dev->board.tuner_addr == msg->addr))
		i2c_speed = AU0828_I2C_CLK_20KHZ;

	/* Set the I2C clock */
	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, i2c_speed);

	/* 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              = KBUILD_MODNAME,
	.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;
		pr_info("%s: i2c scan: found device @ 0x%x  [%s]\n",
		       name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
	}
}

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

	dev->i2c_adap = au0828_i2c_adap_template;
	dev->i2c_algo = au0828_i2c_algo_template;
	dev->i2c_client = au0828_i2c_client_template;

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

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

	dev->i2c_adap.algo = &dev->i2c_algo;
	dev->i2c_adap.algo_data = dev;
#ifdef CONFIG_VIDEO_AU0828_V4L2
	i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
#else
	i2c_set_adapdata(&dev->i2c_adap, dev);
#endif
	i2c_add_adapter(&dev->i2c_adap);

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

	if (0 == dev->i2c_rc) {
		pr_info("i2c bus registered\n");
		if (i2c_scan)
			do_i2c_scan(KBUILD_MODNAME, &dev->i2c_client);
	} else
		pr_info("i2c bus register FAILED\n");

	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.
265a6510 ST	16	*/
265a6510 ST	17
83afb32a MCC	18	#include "au0828.h"
83afb32a MCC	19
265a6510 ST	20	#include <linux/module.h>
	21	#include <linux/moduleparam.h>
	22	#include <linux/init.h>
	23	#include <linux/delay.h>
18d73c58	24	#include <linux/io.h>
265a6510	25
faaf01b2	26	#include "media/tuner.h"
265a6510 ST	27	#include <media/v4l2-common.h>
265a6510 ST	28
b33d24c4	29	static int i2c_scan;
265a6510 ST	30	module_param(i2c_scan, int, 0444);
	31	MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
	32
baede40c DH	33	#define I2C_WAIT_DELAY 25
baede40c DH	34	#define I2C_WAIT_RETRY 1000
265a6510 ST	35
	36	static inline int i2c_slave_did_write_ack(struct i2c_adapter *i2c_adap)
	37	{
	38	struct au0828_dev *dev = i2c_adap->algo_data;
9beb0de9 DH	39	return au0828_read(dev, AU0828_I2C_STATUS_201) &
9beb0de9 DH	40	AU0828_I2C_STATUS_NO_WRITE_ACK ? 0 : 1;
265a6510 ST	41	}
	42
	43	static inline int i2c_slave_did_read_ack(struct i2c_adapter *i2c_adap)
	44	{
	45	struct au0828_dev *dev = i2c_adap->algo_data;
9beb0de9 DH	46	return au0828_read(dev, AU0828_I2C_STATUS_201) &
9beb0de9 DH	47	AU0828_I2C_STATUS_NO_READ_ACK ? 0 : 1;
265a6510 ST	48	}
	49
	50	static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap)
	51	{
	52	int count;
	53
	54	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	55	if (!i2c_slave_did_read_ack(i2c_adap))
	56	break;
	57	udelay(I2C_WAIT_DELAY);
	58	}
	59
	60	if (I2C_WAIT_RETRY == count)
	61	return 0;
	62
	63	return 1;
	64	}
	65
	66	static inline int i2c_is_read_busy(struct i2c_adapter *i2c_adap)
	67	{
	68	struct au0828_dev *dev = i2c_adap->algo_data;
9beb0de9 DH	69	return au0828_read(dev, AU0828_I2C_STATUS_201) &
9beb0de9 DH	70	AU0828_I2C_STATUS_READ_DONE ? 0 : 1;
265a6510 ST	71	}
	72
	73	static int i2c_wait_read_done(struct i2c_adapter *i2c_adap)
	74	{
	75	int count;
	76
	77	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	78	if (!i2c_is_read_busy(i2c_adap))
	79	break;
	80	udelay(I2C_WAIT_DELAY);
	81	}
	82
	83	if (I2C_WAIT_RETRY == count)
	84	return 0;
	85
	86	return 1;
	87	}
	88
	89	static inline int i2c_is_write_done(struct i2c_adapter *i2c_adap)
	90	{
	91	struct au0828_dev *dev = i2c_adap->algo_data;
9beb0de9 DH	92	return au0828_read(dev, AU0828_I2C_STATUS_201) &
9beb0de9 DH	93	AU0828_I2C_STATUS_WRITE_DONE ? 1 : 0;
265a6510 ST	94	}
	95
	96	static int i2c_wait_write_done(struct i2c_adapter *i2c_adap)
	97	{
	98	int count;
	99
	100	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	101	if (i2c_is_write_done(i2c_adap))
	102	break;
	103	udelay(I2C_WAIT_DELAY);
	104	}
	105
	106	if (I2C_WAIT_RETRY == count)
	107	return 0;
	108
	109	return 1;
	110	}
	111
	112	static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
	113	{
	114	struct au0828_dev *dev = i2c_adap->algo_data;
9beb0de9 DH	115	return au0828_read(dev, AU0828_I2C_STATUS_201) &
9beb0de9 DH	116	AU0828_I2C_STATUS_BUSY ? 1 : 0;
265a6510 ST	117	}
	118
	119	static int i2c_wait_done(struct i2c_adapter *i2c_adap)
	120	{
	121	int count;
	122
	123	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	124	if (!i2c_is_busy(i2c_adap))
	125	break;
	126	udelay(I2C_WAIT_DELAY);
	127	}
	128
	129	if (I2C_WAIT_RETRY == count)
	130	return 0;
	131
	132	return 1;
	133	}
	134
	135	/* FIXME: Implement join handling correctly */
	136	static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
	137	const struct i2c_msg *msg, int joined_rlen)
	138	{
	139	int i, strobe = 0;
	140	struct au0828_dev *dev = i2c_adap->algo_data;
cfd0c77d	141	u8 i2c_speed = dev->board.i2c_clk_divider;
265a6510	142
f07e8e4b	143	dprintk(4, "%s()\n", __func__);
265a6510	144
9beb0de9	145	au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
32c000ad	146
ad03d300 DH	147	if (((dev->board.tuner_type == TUNER_XC5000) \|\|
ad03d300 DH	148	(dev->board.tuner_type == TUNER_XC5000C)) &&
cfd0c77d MCC	149	(dev->board.tuner_addr == msg->addr)) {
	150	/*
	151	* Due to I2C clock stretch, we need to use a lower speed
	152	* on xc5000 for commands. However, firmware transfer can
	153	* speed up to 400 KHz.
	154	*/
	155	if (msg->len == 64)
	156	i2c_speed = AU0828_I2C_CLK_250KHZ;
	157	else
	158	i2c_speed = AU0828_I2C_CLK_20KHZ;
faaf01b2	159	}
cfd0c77d MCC	160	/* Set the I2C clock */
cfd0c77d MCC	161	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, i2c_speed);
265a6510 ST	162
265a6510 ST	163	/* Hardware needs 8 bit addresses */
9beb0de9	164	au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
265a6510	165
bc3c613c	166	dprintk(4, "SEND: %02x\n", msg->addr);
265a6510	167
dc8685b5 DH	168	/* Deal with i2c_scan */
	169	if (msg->len == 0) {
	170	/* The analog tuner detection code makes use of the SMBUS_QUICK
	171	message (which involves a zero length i2c write). To avoid
	172	checking the status register when we didn't strobe out any
	173	actual bytes to the bus, just do a read check. This is
	174	consistent with how I saw i2c device checking done in the
	175	USB trace of the Windows driver */
9beb0de9 DH	176	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	177	AU0828_I2C_TRIGGER_READ);
	178
dc8685b5 DH	179	if (!i2c_wait_done(i2c_adap))
	180	return -EIO;
	181
	182	if (i2c_wait_read_ack(i2c_adap))
	183	return -EIO;
	184
	185	return 0;
	186	}
	187
a9c36aad	188	for (i = 0; i < msg->len;) {
265a6510	189
bc3c613c	190	dprintk(4, " %02x\n", msg->buf[i]);
265a6510	191
9beb0de9	192	au0828_write(dev, AU0828_I2C_WRITE_FIFO_205, msg->buf[i]);
265a6510 ST	193
	194	strobe++;
	195	i++;
	196
	197	if ((strobe >= 4) \|\| (i >= msg->len)) {
	198
	199	/* Strobe the byte into the bus */
	200	if (i < msg->len)
9beb0de9 DH	201	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	202	AU0828_I2C_TRIGGER_WRITE \|
	203	AU0828_I2C_TRIGGER_HOLD);
265a6510	204	else
9beb0de9 DH	205	au0828_write(dev, AU0828_I2C_TRIGGER_200,
9beb0de9 DH	206	AU0828_I2C_TRIGGER_WRITE);
265a6510 ST	207
	208	/* Reset strobe trigger */
	209	strobe = 0;
	210
	211	if (!i2c_wait_write_done(i2c_adap))
	212	return -EIO;
	213
	214	}
	215
	216	}
	217	if (!i2c_wait_done(i2c_adap))
	218	return -EIO;
	219
bc3c613c	220	dprintk(4, "\n");
265a6510 ST	221
	222	return msg->len;
	223	}
	224
	225	/* FIXME: Implement join handling correctly */
	226	static int i2c_readbytes(struct i2c_adapter *i2c_adap,
	227	const struct i2c_msg *msg, int joined)
	228	{
	229	struct au0828_dev *dev = i2c_adap->algo_data;
cfd0c77d	230	u8 i2c_speed = dev->board.i2c_clk_divider;
265a6510 ST	231	int i;
265a6510 ST	232
f07e8e4b	233	dprintk(4, "%s()\n", __func__);
265a6510	234
9beb0de9	235	au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
32c000ad	236
cfd0c77d MCC	237	/*
	238	* Due to xc5000c clock stretch, we cannot use full speed at
	239	* readings from xc5000, as otherwise they'll fail.
	240	*/
	241	if (((dev->board.tuner_type == TUNER_XC5000) \|\|
	242	(dev->board.tuner_type == TUNER_XC5000C)) &&
	243	(dev->board.tuner_addr == msg->addr))
	244	i2c_speed = AU0828_I2C_CLK_20KHZ;
	245
16af6f5a	246	/* Set the I2C clock */
cfd0c77d	247	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, i2c_speed);
265a6510 ST	248
265a6510 ST	249	/* Hardware needs 8 bit addresses */
9beb0de9	250	au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
265a6510	251
bc3c613c	252	dprintk(4, " RECV:\n");
265a6510 ST	253
	254	/* Deal with i2c_scan */
	255	if (msg->len == 0) {
9beb0de9 DH	256	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	257	AU0828_I2C_TRIGGER_READ);
	258
265a6510 ST	259	if (i2c_wait_read_ack(i2c_adap))
	260	return -EIO;
	261	return 0;
	262	}
	263
a9c36aad	264	for (i = 0; i < msg->len;) {
265a6510 ST	265
	266	i++;
	267
	268	if (i < msg->len)
9beb0de9 DH	269	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	270	AU0828_I2C_TRIGGER_READ \|
	271	AU0828_I2C_TRIGGER_HOLD);
265a6510	272	else
9beb0de9 DH	273	au0828_write(dev, AU0828_I2C_TRIGGER_200,
9beb0de9 DH	274	AU0828_I2C_TRIGGER_READ);
265a6510 ST	275
	276	if (!i2c_wait_read_done(i2c_adap))
	277	return -EIO;
	278
9beb0de9 DH	279	msg->buf[i-1] = au0828_read(dev, AU0828_I2C_READ_FIFO_209) &
9beb0de9 DH	280	0xff;
265a6510	281
bc3c613c	282	dprintk(4, " %02x\n", msg->buf[i-1]);
265a6510 ST	283	}
	284	if (!i2c_wait_done(i2c_adap))
	285	return -EIO;
	286
bc3c613c	287	dprintk(4, "\n");
265a6510 ST	288
	289	return msg->len;
	290	}
	291
	292	static int i2c_xfer(struct i2c_adapter *i2c_adap,
	293	struct i2c_msg *msgs, int num)
	294	{
	295	int i, retval = 0;
	296
f07e8e4b	297	dprintk(4, "%s(num = %d)\n", __func__, num);
265a6510	298
a9c36aad	299	for (i = 0; i < num; i++) {
bc3c613c	300	dprintk(4, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
f07e8e4b	301	__func__, num, msgs[i].addr, msgs[i].len);
265a6510 ST	302	if (msgs[i].flags & I2C_M_RD) {
	303	/* read */
	304	retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
	305	} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
	306	msgs[i].addr == msgs[i + 1].addr) {
	307	/* write then read from same address */
	308	retval = i2c_sendbytes(i2c_adap, &msgs[i],
	309	msgs[i + 1].len);
	310	if (retval < 0)
	311	goto err;
	312	i++;
	313	retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
	314	} else {
	315	/* write */
	316	retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
	317	}
	318	if (retval < 0)
	319	goto err;
	320	}
	321	return num;
	322
	323	err:
	324	return retval;
	325	}
	326
265a6510 ST	327	static u32 au0828_functionality(struct i2c_adapter *adap)
	328	{
	329	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_I2C;
	330	}
	331
	332	static struct i2c_algorithm au0828_i2c_algo_template = {
	333	.master_xfer = i2c_xfer,
	334	.functionality = au0828_functionality,
	335	};
	336
	337	/* ----------------------------------------------------------------------- */
	338
	339	static struct i2c_adapter au0828_i2c_adap_template = {
83afb32a	340	.name = KBUILD_MODNAME,
265a6510	341	.owner = THIS_MODULE,
265a6510	342	.algo = &au0828_i2c_algo_template,
265a6510 ST	343	};
	344
	345	static struct i2c_client au0828_i2c_client_template = {
	346	.name = "au0828 internal",
	347	};
	348
	349	static char *i2c_devs[128] = {
18d73c58 MCC	350	[0x8e >> 1] = "au8522",
	351	[0xa0 >> 1] = "eeprom",
	352	[0xc2 >> 1] = "tuner/xc5000",
265a6510 ST	353	};
	354
	355	static void do_i2c_scan(char name, struct i2c_client c)
	356	{
	357	unsigned char buf;
	358	int i, rc;
	359
	360	for (i = 0; i < 128; i++) {
	361	c->addr = i;
	362	rc = i2c_master_recv(c, &buf, 0);
	363	if (rc < 0)
	364	continue;
83afb32a	365	pr_info("%s: i2c scan: found device @ 0x%x [%s]\n",
265a6510 ST	366	name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
	367	}
	368	}
	369
a824f0f4	370	/* init + register i2c adapter */
265a6510 ST	371	int au0828_i2c_register(struct au0828_dev *dev)
265a6510 ST	372	{
f07e8e4b	373	dprintk(1, "%s()\n", __func__);
265a6510	374
f01e0ffd EG	375	dev->i2c_adap = au0828_i2c_adap_template;
	376	dev->i2c_algo = au0828_i2c_algo_template;
	377	dev->i2c_client = au0828_i2c_client_template;
265a6510 ST	378
	379	dev->i2c_adap.dev.parent = &dev->usbdev->dev;
	380
83afb32a	381	strlcpy(dev->i2c_adap.name, KBUILD_MODNAME,
265a6510 ST	382	sizeof(dev->i2c_adap.name));
265a6510 ST	383
b14667f3	384	dev->i2c_adap.algo = &dev->i2c_algo;
265a6510	385	dev->i2c_adap.algo_data = dev;
8a4e7866	386	#ifdef CONFIG_VIDEO_AU0828_V4L2
b14667f3	387	i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
8a4e7866 MK	388	#else
	389	i2c_set_adapdata(&dev->i2c_adap, dev);
	390	#endif
265a6510 ST	391	i2c_add_adapter(&dev->i2c_adap);
	392
	393	dev->i2c_client.adapter = &dev->i2c_adap;
	394
	395	if (0 == dev->i2c_rc) {
83afb32a	396	pr_info("i2c bus registered\n");
265a6510	397	if (i2c_scan)
83afb32a	398	do_i2c_scan(KBUILD_MODNAME, &dev->i2c_client);
265a6510	399	} else
83afb32a	400	pr_info("i2c bus register FAILED\n");
bc3c613c	401
265a6510 ST	402	return dev->i2c_rc;
	403	}
	404
	405	int au0828_i2c_unregister(struct au0828_dev *dev)
	406	{
	407	i2c_del_adapter(&dev->i2c_adap);
	408	return 0;
	409	}
	410