[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);

	/* FIXME: There is a problem with i2c communications with xc5000 that
	   requires us to slow down the i2c clock until we have a better
	   strategy (such as using the secondary i2c bus to do firmware
	   loading */
	if ((msg->addr << 1) == 0xc2)
		au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
			     AU0828_I2C_CLK_30KHZ);
	else
		au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
			     AU0828_I2C_CLK_250KHZ);

	/* 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);

	/* FIXME: There is a problem with i2c communications with xc5000 that
	   requires us to slow down the i2c clock until we have a better
	   strategy (such as using the secondary i2c bus to do firmware
	   loading */
	if ((msg->addr << 1) == 0xc2)
		au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
			     AU0828_I2C_CLK_30KHZ);
	else
		au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
			     AU0828_I2C_CLK_250KHZ);

	/* 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,
	.id                = I2C_HW_B_AU0828,
	.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 DH	148
	149	/* FIXME: There is a problem with i2c communications with xc5000 that
	150	requires us to slow down the i2c clock until we have a better
	151	strategy (such as using the secondary i2c bus to do firmware
	152	loading */
62899a28	153	if ((msg->addr << 1) == 0xc2)
9beb0de9 DH	154	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
9beb0de9 DH	155	AU0828_I2C_CLK_30KHZ);
62899a28	156	else
9beb0de9 DH	157	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
9beb0de9 DH	158	AU0828_I2C_CLK_250KHZ);
265a6510 ST	159
265a6510 ST	160	/* Hardware needs 8 bit addresses */
9beb0de9	161	au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
265a6510	162
bc3c613c	163	dprintk(4, "SEND: %02x\n", msg->addr);
265a6510	164
dc8685b5 DH	165	/* Deal with i2c_scan */
	166	if (msg->len == 0) {
	167	/* The analog tuner detection code makes use of the SMBUS_QUICK
	168	message (which involves a zero length i2c write). To avoid
	169	checking the status register when we didn't strobe out any
	170	actual bytes to the bus, just do a read check. This is
	171	consistent with how I saw i2c device checking done in the
	172	USB trace of the Windows driver */
9beb0de9 DH	173	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	174	AU0828_I2C_TRIGGER_READ);
	175
dc8685b5 DH	176	if (!i2c_wait_done(i2c_adap))
	177	return -EIO;
	178
	179	if (i2c_wait_read_ack(i2c_adap))
	180	return -EIO;
	181
	182	return 0;
	183	}
	184
a9c36aad	185	for (i = 0; i < msg->len;) {
265a6510	186
bc3c613c	187	dprintk(4, " %02x\n", msg->buf[i]);
265a6510	188
9beb0de9	189	au0828_write(dev, AU0828_I2C_WRITE_FIFO_205, msg->buf[i]);
265a6510 ST	190
	191	strobe++;
	192	i++;
	193
	194	if ((strobe >= 4) \|\| (i >= msg->len)) {
	195
	196	/* Strobe the byte into the bus */
	197	if (i < msg->len)
9beb0de9 DH	198	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	199	AU0828_I2C_TRIGGER_WRITE \|
	200	AU0828_I2C_TRIGGER_HOLD);
265a6510	201	else
9beb0de9 DH	202	au0828_write(dev, AU0828_I2C_TRIGGER_200,
9beb0de9 DH	203	AU0828_I2C_TRIGGER_WRITE);
265a6510 ST	204
	205	/* Reset strobe trigger */
	206	strobe = 0;
	207
	208	if (!i2c_wait_write_done(i2c_adap))
	209	return -EIO;
	210
	211	}
	212
	213	}
	214	if (!i2c_wait_done(i2c_adap))
	215	return -EIO;
	216
bc3c613c	217	dprintk(4, "\n");
265a6510 ST	218
	219	return msg->len;
	220	}
	221
	222	/* FIXME: Implement join handling correctly */
	223	static int i2c_readbytes(struct i2c_adapter *i2c_adap,
	224	const struct i2c_msg *msg, int joined)
	225	{
	226	struct au0828_dev *dev = i2c_adap->algo_data;
	227	int i;
	228
f07e8e4b	229	dprintk(4, "%s()\n", __func__);
265a6510	230
9beb0de9	231	au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
32c000ad DH	232
	233	/* FIXME: There is a problem with i2c communications with xc5000 that
	234	requires us to slow down the i2c clock until we have a better
	235	strategy (such as using the secondary i2c bus to do firmware
	236	loading */
62899a28	237	if ((msg->addr << 1) == 0xc2)
9beb0de9 DH	238	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
9beb0de9 DH	239	AU0828_I2C_CLK_30KHZ);
62899a28	240	else
9beb0de9 DH	241	au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
9beb0de9 DH	242	AU0828_I2C_CLK_250KHZ);
265a6510 ST	243
265a6510 ST	244	/* Hardware needs 8 bit addresses */
9beb0de9	245	au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
265a6510	246
bc3c613c	247	dprintk(4, " RECV:\n");
265a6510 ST	248
	249	/* Deal with i2c_scan */
	250	if (msg->len == 0) {
9beb0de9 DH	251	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	252	AU0828_I2C_TRIGGER_READ);
	253
265a6510 ST	254	if (i2c_wait_read_ack(i2c_adap))
	255	return -EIO;
	256	return 0;
	257	}
	258
a9c36aad	259	for (i = 0; i < msg->len;) {
265a6510 ST	260
	261	i++;
	262
	263	if (i < msg->len)
9beb0de9 DH	264	au0828_write(dev, AU0828_I2C_TRIGGER_200,
	265	AU0828_I2C_TRIGGER_READ \|
	266	AU0828_I2C_TRIGGER_HOLD);
265a6510	267	else
9beb0de9 DH	268	au0828_write(dev, AU0828_I2C_TRIGGER_200,
9beb0de9 DH	269	AU0828_I2C_TRIGGER_READ);
265a6510 ST	270
	271	if (!i2c_wait_read_done(i2c_adap))
	272	return -EIO;
	273
9beb0de9 DH	274	msg->buf[i-1] = au0828_read(dev, AU0828_I2C_READ_FIFO_209) &
9beb0de9 DH	275	0xff;
265a6510	276
bc3c613c	277	dprintk(4, " %02x\n", msg->buf[i-1]);
265a6510 ST	278	}
	279	if (!i2c_wait_done(i2c_adap))
	280	return -EIO;
	281
bc3c613c	282	dprintk(4, "\n");
265a6510 ST	283
	284	return msg->len;
	285	}
	286
	287	static int i2c_xfer(struct i2c_adapter *i2c_adap,
	288	struct i2c_msg *msgs, int num)
	289	{
	290	int i, retval = 0;
	291
f07e8e4b	292	dprintk(4, "%s(num = %d)\n", __func__, num);
265a6510	293
a9c36aad	294	for (i = 0; i < num; i++) {
bc3c613c	295	dprintk(4, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
f07e8e4b	296	__func__, num, msgs[i].addr, msgs[i].len);
265a6510 ST	297	if (msgs[i].flags & I2C_M_RD) {
	298	/* read */
	299	retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
	300	} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
	301	msgs[i].addr == msgs[i + 1].addr) {
	302	/* write then read from same address */
	303	retval = i2c_sendbytes(i2c_adap, &msgs[i],
	304	msgs[i + 1].len);
	305	if (retval < 0)
	306	goto err;
	307	i++;
	308	retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
	309	} else {
	310	/* write */
	311	retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
	312	}
	313	if (retval < 0)
	314	goto err;
	315	}
	316	return num;
	317
	318	err:
	319	return retval;
	320	}
	321
265a6510 ST	322	static u32 au0828_functionality(struct i2c_adapter *adap)
	323	{
	324	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_I2C;
	325	}
	326
	327	static struct i2c_algorithm au0828_i2c_algo_template = {
	328	.master_xfer = i2c_xfer,
	329	.functionality = au0828_functionality,
	330	};
	331
	332	/* ----------------------------------------------------------------------- */
	333
	334	static struct i2c_adapter au0828_i2c_adap_template = {
	335	.name = DRIVER_NAME,
	336	.owner = THIS_MODULE,
	337	.id = I2C_HW_B_AU0828,
	338	.algo = &au0828_i2c_algo_template,
265a6510 ST	339	};
	340
	341	static struct i2c_client au0828_i2c_client_template = {
	342	.name = "au0828 internal",
	343	};
	344
	345	static char *i2c_devs[128] = {
18d73c58 MCC	346	[0x8e >> 1] = "au8522",
	347	[0xa0 >> 1] = "eeprom",
	348	[0xc2 >> 1] = "tuner/xc5000",
265a6510 ST	349	};
	350
	351	static void do_i2c_scan(char name, struct i2c_client c)
	352	{
	353	unsigned char buf;
	354	int i, rc;
	355
	356	for (i = 0; i < 128; i++) {
	357	c->addr = i;
	358	rc = i2c_master_recv(c, &buf, 0);
	359	if (rc < 0)
	360	continue;
18d73c58	361	printk(KERN_INFO "%s: i2c scan: found device @ 0x%x [%s]\n",
265a6510 ST	362	name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
	363	}
	364	}
	365
	366	/* init + register i2c algo-bit adapter */
	367	int au0828_i2c_register(struct au0828_dev *dev)
	368	{
f07e8e4b	369	dprintk(1, "%s()\n", __func__);
265a6510 ST	370
	371	memcpy(&dev->i2c_adap, &au0828_i2c_adap_template,
	372	sizeof(dev->i2c_adap));
	373	memcpy(&dev->i2c_algo, &au0828_i2c_algo_template,
	374	sizeof(dev->i2c_algo));
	375	memcpy(&dev->i2c_client, &au0828_i2c_client_template,
	376	sizeof(dev->i2c_client));
	377
	378	dev->i2c_adap.dev.parent = &dev->usbdev->dev;
	379
	380	strlcpy(dev->i2c_adap.name, DRIVER_NAME,
	381	sizeof(dev->i2c_adap.name));
	382
b14667f3	383	dev->i2c_adap.algo = &dev->i2c_algo;
265a6510	384	dev->i2c_adap.algo_data = dev;
b14667f3	385	i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
265a6510 ST	386	i2c_add_adapter(&dev->i2c_adap);
	387
	388	dev->i2c_client.adapter = &dev->i2c_adap;
	389
	390	if (0 == dev->i2c_rc) {
18d73c58	391	printk(KERN_INFO "%s: i2c bus registered\n", DRIVER_NAME);
265a6510 ST	392	if (i2c_scan)
	393	do_i2c_scan(DRIVER_NAME, &dev->i2c_client);
	394	} else
18d73c58	395	printk(KERN_INFO "%s: i2c bus register FAILED\n", DRIVER_NAME);
bc3c613c	396
265a6510 ST	397	return dev->i2c_rc;
	398	}
	399
	400	int au0828_i2c_unregister(struct au0828_dev *dev)
	401	{
	402	i2c_del_adapter(&dev->i2c_adap);
	403	return 0;
	404	}
	405