[mirror_ubuntu-artful-kernel.git] / drivers / media / video / cx25821 / cx25821-i2c.c

/*
 *  Driver for the Conexant CX25821 PCIe bridge
 *
 *  Copyright (C) 2009 Conexant Systems Inc.
 *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
 *	Based on Steven Toth <stoth@linuxtv.org> cx23885 driver
 *
 *  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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include "cx25821.h"
#include <linux/i2c.h>

static unsigned int i2c_debug;
module_param(i2c_debug, int, 0644);
MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");

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

#define dprintk(level, fmt, arg...)					\
do {									\
	if (i2c_debug >= level)						\
		printk(KERN_DEBUG "%s/0: " fmt, dev->name, ##arg);	\
} while (0)

#define I2C_WAIT_DELAY 32
#define I2C_WAIT_RETRY 64

#define I2C_EXTEND  (1 << 3)
#define I2C_NOSTOP  (1 << 4)

static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
{
	struct cx25821_i2c *bus = i2c_adap->algo_data;
	struct cx25821_dev *dev = bus->dev;
	return cx_read(bus->reg_stat) & 0x01;
}

static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
{
	struct cx25821_i2c *bus = i2c_adap->algo_data;
	struct cx25821_dev *dev = bus->dev;
	return cx_read(bus->reg_stat) & 0x02 ? 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;
}

static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
			 const struct i2c_msg *msg, int joined_rlen)
{
	struct cx25821_i2c *bus = i2c_adap->algo_data;
	struct cx25821_dev *dev = bus->dev;
	u32 wdata, addr, ctrl;
	int retval, cnt;

	if (joined_rlen)
		dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__,
			msg->len, joined_rlen);
	else
		dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);

	/* Deal with i2c probe functions with zero payload */
	if (msg->len == 0) {
		cx_write(bus->reg_addr, msg->addr << 25);
		cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2));

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

		if (!i2c_slave_did_ack(i2c_adap))
			return -EIO;

		dprintk(1, "%s(): returns 0\n", __func__);
		return 0;
	}

	/* dev, reg + first byte */
	addr = (msg->addr << 25) | msg->buf[0];
	wdata = msg->buf[0];

	ctrl = bus->i2c_period | (1 << 12) | (1 << 2);

	if (msg->len > 1)
		ctrl |= I2C_NOSTOP | I2C_EXTEND;
	else if (joined_rlen)
		ctrl |= I2C_NOSTOP;

	cx_write(bus->reg_addr, addr);
	cx_write(bus->reg_wdata, wdata);
	cx_write(bus->reg_ctrl, ctrl);

	retval = i2c_wait_done(i2c_adap);
	if (retval < 0)
		goto err;

	if (retval == 0)
		goto eio;

	if (i2c_debug) {
		if (!(ctrl & I2C_NOSTOP))
			printk(" >\n");
	}

	for (cnt = 1; cnt < msg->len; cnt++) {
		/* following bytes */
		wdata = msg->buf[cnt];
		ctrl = bus->i2c_period | (1 << 12) | (1 << 2);

		if (cnt < msg->len - 1)
			ctrl |= I2C_NOSTOP | I2C_EXTEND;
		else if (joined_rlen)
			ctrl |= I2C_NOSTOP;

		cx_write(bus->reg_addr, addr);
		cx_write(bus->reg_wdata, wdata);
		cx_write(bus->reg_ctrl, ctrl);

		retval = i2c_wait_done(i2c_adap);
		if (retval < 0)
			goto err;

		if (retval == 0)
			goto eio;

		if (i2c_debug) {
			dprintk(1, " %02x", msg->buf[cnt]);
			if (!(ctrl & I2C_NOSTOP))
				dprintk(1, " >\n");
		}
	}

	return msg->len;

eio:
	retval = -EIO;
err:
	if (i2c_debug)
		pr_err(" ERR: %d\n", retval);
	return retval;
}

static int i2c_readbytes(struct i2c_adapter *i2c_adap,
			 const struct i2c_msg *msg, int joined)
{
	struct cx25821_i2c *bus = i2c_adap->algo_data;
	struct cx25821_dev *dev = bus->dev;
	u32 ctrl, cnt;
	int retval;

	if (i2c_debug && !joined)
		dprintk(1, "6-%s(msg->len=%d)\n", __func__, msg->len);

	/* Deal with i2c probe functions with zero payload */
	if (msg->len == 0) {
		cx_write(bus->reg_addr, msg->addr << 25);
		cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1);
		if (!i2c_wait_done(i2c_adap))
			return -EIO;
		if (!i2c_slave_did_ack(i2c_adap))
			return -EIO;

		dprintk(1, "%s(): returns 0\n", __func__);
		return 0;
	}

	if (i2c_debug) {
		if (joined)
			dprintk(1, " R");
		else
			dprintk(1, " <R %02x", (msg->addr << 1) + 1);
	}

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

		ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1;

		if (cnt < msg->len - 1)
			ctrl |= I2C_NOSTOP | I2C_EXTEND;

		cx_write(bus->reg_addr, msg->addr << 25);
		cx_write(bus->reg_ctrl, ctrl);

		retval = i2c_wait_done(i2c_adap);
		if (retval < 0)
			goto err;
		if (retval == 0)
			goto eio;
		msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;

		if (i2c_debug) {
			dprintk(1, " %02x", msg->buf[cnt]);
			if (!(ctrl & I2C_NOSTOP))
				dprintk(1, " >\n");
		}
	}

	return msg->len;
eio:
	retval = -EIO;
err:
	if (i2c_debug)
		pr_err(" ERR: %d\n", retval);
	return retval;
}

static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
{
	struct cx25821_i2c *bus = i2c_adap->algo_data;
	struct cx25821_dev *dev = bus->dev;
	int i, retval = 0;

	dprintk(1, "%s(num = %d)\n", __func__, num);

	for (i = 0; i < num; i++) {
		dprintk(1, "%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 cx25821_functionality(struct i2c_adapter *adap)
{
	return I2C_FUNC_SMBUS_EMUL |
	    I2C_FUNC_I2C |
	    I2C_FUNC_SMBUS_WORD_DATA |
	    I2C_FUNC_SMBUS_READ_WORD_DATA | I2C_FUNC_SMBUS_WRITE_WORD_DATA;
}

static struct i2c_algorithm cx25821_i2c_algo_template = {
	.master_xfer = i2c_xfer,
	.functionality = cx25821_functionality,
#ifdef NEED_ALGO_CONTROL
	.algo_control = dummy_algo_control,
#endif
};

static struct i2c_adapter cx25821_i2c_adap_template = {
	.name = "cx25821",
	.owner = THIS_MODULE,
	.algo = &cx25821_i2c_algo_template,
};

static struct i2c_client cx25821_i2c_client_template = {
	.name = "cx25821 internal",
};

/* init + register i2c algo-bit adapter */
int cx25821_i2c_register(struct cx25821_i2c *bus)
{
	struct cx25821_dev *dev = bus->dev;

	dprintk(1, "%s(bus = %d)\n", __func__, bus->nr);

	memcpy(&bus->i2c_adap, &cx25821_i2c_adap_template,
	       sizeof(bus->i2c_adap));
	memcpy(&bus->i2c_algo, &cx25821_i2c_algo_template,
	       sizeof(bus->i2c_algo));
	memcpy(&bus->i2c_client, &cx25821_i2c_client_template,
	       sizeof(bus->i2c_client));

	bus->i2c_adap.dev.parent = &dev->pci->dev;

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

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

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

	/* set up the I2c */
	bus->i2c_client.addr = (0x88 >> 1);

	return bus->i2c_rc;
}

int cx25821_i2c_unregister(struct cx25821_i2c *bus)
{
	i2c_del_adapter(&bus->i2c_adap);
	return 0;
}

void cx25821_av_clk(struct cx25821_dev *dev, int enable)
{
	/* write 0 to bus 2 addr 0x144 via i2x_xfer() */
	char buffer[3];
	struct i2c_msg msg;
	dprintk(1, "%s(enabled = %d)\n", __func__, enable);

	/* Register 0x144 */
	buffer[0] = 0x01;
	buffer[1] = 0x44;
	if (enable == 1)
		buffer[2] = 0x05;
	else
		buffer[2] = 0x00;

	msg.addr = 0x44;
	msg.flags = I2C_M_TEN;
	msg.len = 3;
	msg.buf = buffer;

	i2c_xfer(&dev->i2c_bus[0].i2c_adap, &msg, 1);
}

int cx25821_i2c_read(struct cx25821_i2c *bus, u16 reg_addr, int *value)
{
	struct i2c_client *client = &bus->i2c_client;
	int retval = 0;
	int v = 0;
	u8 addr[2] = { 0, 0 };
	u8 buf[4] = { 0, 0, 0, 0 };

	struct i2c_msg msgs[2] = {
		{
			.addr = client->addr,
			.flags = 0,
			.len = 2,
			.buf = addr,
		}, {
			.addr = client->addr,
			.flags = I2C_M_RD,
			.len = 4,
			.buf = buf,
		}
	};

	addr[0] = (reg_addr >> 8);
	addr[1] = (reg_addr & 0xff);
	msgs[0].addr = 0x44;
	msgs[1].addr = 0x44;

	retval = i2c_xfer(client->adapter, msgs, 2);

	v = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
	*value = v;

	return v;
}

int cx25821_i2c_write(struct cx25821_i2c *bus, u16 reg_addr, int value)
{
	struct i2c_client *client = &bus->i2c_client;
	int retval = 0;
	u8 buf[6] = { 0, 0, 0, 0, 0, 0 };

	struct i2c_msg msgs[1] = {
		{
			.addr = client->addr,
			.flags = 0,
			.len = 6,
			.buf = buf,
		}
	};

	buf[0] = reg_addr >> 8;
	buf[1] = reg_addr & 0xff;
	buf[5] = (value >> 24) & 0xff;
	buf[4] = (value >> 16) & 0xff;
	buf[3] = (value >> 8) & 0xff;
	buf[2] = value & 0xff;
	client->flags = 0;
	msgs[0].addr = 0x44;

	retval = i2c_xfer(client->adapter, msgs, 1);

	return retval;
}
Commit	Line	Data
1a9fc855 MCC	1	/*
	2	* Driver for the Conexant CX25821 PCIe bridge
	3	*
	4	* Copyright (C) 2009 Conexant Systems Inc.
	5	* Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
	6	* Based on Steven Toth <stoth@linuxtv.org> cx23885 driver
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	*
	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., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*/
	23
36d89f7d JP	24	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
36d89f7d JP	25
02b20b0b MCC	26	#include "cx25821.h"
	27	#include <linux/i2c.h>
	28
02b20b0b MCC	29	static unsigned int i2c_debug;
	30	module_param(i2c_debug, int, 0644);
	31	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
	32
bde4301d	33	static unsigned int i2c_scan;
02b20b0b MCC	34	module_param(i2c_scan, int, 0444);
	35	MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
	36
36d89f7d JP	37	#define dprintk(level, fmt, arg...) \
	38	do { \
	39	if (i2c_debug >= level) \
	40	printk(KERN_DEBUG "%s/0: " fmt, dev->name, ##arg); \
	41	} while (0)
02b20b0b MCC	42
	43	#define I2C_WAIT_DELAY 32
	44	#define I2C_WAIT_RETRY 64
	45
	46	#define I2C_EXTEND (1 << 3)
	47	#define I2C_NOSTOP (1 << 4)
	48
02b20b0b MCC	49	static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
	50	{
	51	struct cx25821_i2c *bus = i2c_adap->algo_data;
	52	struct cx25821_dev *dev = bus->dev;
	53	return cx_read(bus->reg_stat) & 0x01;
	54	}
	55
	56	static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
	57	{
	58	struct cx25821_i2c *bus = i2c_adap->algo_data;
	59	struct cx25821_dev *dev = bus->dev;
	60	return cx_read(bus->reg_stat) & 0x02 ? 1 : 0;
	61	}
	62
	63	static int i2c_wait_done(struct i2c_adapter *i2c_adap)
	64	{
	65	int count;
	66
	67	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	68	if (!i2c_is_busy(i2c_adap))
	69	break;
	70	udelay(I2C_WAIT_DELAY);
	71	}
	72
	73	if (I2C_WAIT_RETRY == count)
	74	return 0;
	75
	76	return 1;
	77	}
	78
1a9fc855 MCC	79	static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
1a9fc855 MCC	80	const struct i2c_msg *msg, int joined_rlen)
02b20b0b MCC	81	{
	82	struct cx25821_i2c *bus = i2c_adap->algo_data;
	83	struct cx25821_dev *dev = bus->dev;
	84	u32 wdata, addr, ctrl;
	85	int retval, cnt;
	86
	87	if (joined_rlen)
1a9fc855 MCC	88	dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__,
1a9fc855 MCC	89	msg->len, joined_rlen);
02b20b0b MCC	90	else
	91	dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
	92
	93	/* Deal with i2c probe functions with zero payload */
1a9fc855	94	if (msg->len == 0) {
bb4c9a74	95	cx_write(bus->reg_addr, msg->addr << 25);
02b20b0b MCC	96	cx_write(bus->reg_ctrl, bus->i2c_period \| (1 << 2));
	97
	98	if (!i2c_wait_done(i2c_adap))
	99	return -EIO;
	100
	101	if (!i2c_slave_did_ack(i2c_adap))
	102	return -EIO;
	103
36d89f7d	104	dprintk(1, "%s(): returns 0\n", __func__);
02b20b0b MCC	105	return 0;
	106	}
	107
	108	/* dev, reg + first byte */
	109	addr = (msg->addr << 25) \| msg->buf[0];
	110	wdata = msg->buf[0];
bb4c9a74	111
02b20b0b MCC	112	ctrl = bus->i2c_period \| (1 << 12) \| (1 << 2);
	113
	114	if (msg->len > 1)
	115	ctrl \|= I2C_NOSTOP \| I2C_EXTEND;
	116	else if (joined_rlen)
	117	ctrl \|= I2C_NOSTOP;
	118
	119	cx_write(bus->reg_addr, addr);
	120	cx_write(bus->reg_wdata, wdata);
	121	cx_write(bus->reg_ctrl, ctrl);
	122
	123	retval = i2c_wait_done(i2c_adap);
	124	if (retval < 0)
	125	goto err;
	126
	127	if (retval == 0)
	128	goto eio;
	129
1a9fc855	130	if (i2c_debug) {
02b20b0b MCC	131	if (!(ctrl & I2C_NOSTOP))
	132	printk(" >\n");
	133	}
	134
	135	for (cnt = 1; cnt < msg->len; cnt++) {
	136	/* following bytes */
	137	wdata = msg->buf[cnt];
	138	ctrl = bus->i2c_period \| (1 << 12) \| (1 << 2);
	139
	140	if (cnt < msg->len - 1)
	141	ctrl \|= I2C_NOSTOP \| I2C_EXTEND;
	142	else if (joined_rlen)
	143	ctrl \|= I2C_NOSTOP;
	144
	145	cx_write(bus->reg_addr, addr);
	146	cx_write(bus->reg_wdata, wdata);
	147	cx_write(bus->reg_ctrl, ctrl);
	148
	149	retval = i2c_wait_done(i2c_adap);
	150	if (retval < 0)
	151	goto err;
	152
	153	if (retval == 0)
	154	goto eio;
	155
1a9fc855	156	if (i2c_debug) {
02b20b0b MCC	157	dprintk(1, " %02x", msg->buf[cnt]);
	158	if (!(ctrl & I2C_NOSTOP))
	159	dprintk(1, " >\n");
	160	}
	161	}
bb4c9a74	162
02b20b0b MCC	163	return msg->len;
02b20b0b MCC	164
51e9dd32	165	eio:
02b20b0b	166	retval = -EIO;
51e9dd32	167	err:
02b20b0b	168	if (i2c_debug)
36d89f7d	169	pr_err(" ERR: %d\n", retval);
02b20b0b MCC	170	return retval;
	171	}
	172
1a9fc855 MCC	173	static int i2c_readbytes(struct i2c_adapter *i2c_adap,
1a9fc855 MCC	174	const struct i2c_msg *msg, int joined)
02b20b0b MCC	175	{
	176	struct cx25821_i2c *bus = i2c_adap->algo_data;
	177	struct cx25821_dev *dev = bus->dev;
	178	u32 ctrl, cnt;
	179	int retval;
	180
02b20b0b MCC	181	if (i2c_debug && !joined)
	182	dprintk(1, "6-%s(msg->len=%d)\n", __func__, msg->len);
	183
	184	/* Deal with i2c probe functions with zero payload */
	185	if (msg->len == 0) {
	186	cx_write(bus->reg_addr, msg->addr << 25);
	187	cx_write(bus->reg_ctrl, bus->i2c_period \| (1 << 2) \| 1);
	188	if (!i2c_wait_done(i2c_adap))
	189	return -EIO;
	190	if (!i2c_slave_did_ack(i2c_adap))
	191	return -EIO;
	192
36d89f7d	193	dprintk(1, "%s(): returns 0\n", __func__);
02b20b0b MCC	194	return 0;
	195	}
	196
	197	if (i2c_debug) {
	198	if (joined)
	199	dprintk(1, " R");
	200	else
	201	dprintk(1, " <R %02x", (msg->addr << 1) + 1);
	202	}
	203
	204	for (cnt = 0; cnt < msg->len; cnt++) {
	205
	206	ctrl = bus->i2c_period \| (1 << 12) \| (1 << 2) \| 1;
	207
	208	if (cnt < msg->len - 1)
	209	ctrl \|= I2C_NOSTOP \| I2C_EXTEND;
	210
02b20b0b MCC	211	cx_write(bus->reg_addr, msg->addr << 25);
	212	cx_write(bus->reg_ctrl, ctrl);
	213
	214	retval = i2c_wait_done(i2c_adap);
	215	if (retval < 0)
	216	goto err;
	217	if (retval == 0)
	218	goto eio;
	219	msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
	220
	221	if (i2c_debug) {
	222	dprintk(1, " %02x", msg->buf[cnt]);
	223	if (!(ctrl & I2C_NOSTOP))
	224	dprintk(1, " >\n");
	225	}
	226	}
	227
	228	return msg->len;
51e9dd32	229	eio:
02b20b0b	230	retval = -EIO;
51e9dd32	231	err:
02b20b0b	232	if (i2c_debug)
36d89f7d	233	pr_err(" ERR: %d\n", retval);
02b20b0b MCC	234	return retval;
	235	}
	236
	237	static int i2c_xfer(struct i2c_adapter i2c_adap, struct i2c_msg msgs, int num)
	238	{
	239	struct cx25821_i2c *bus = i2c_adap->algo_data;
	240	struct cx25821_dev *dev = bus->dev;
	241	int i, retval = 0;
	242
	243	dprintk(1, "%s(num = %d)\n", __func__, num);
	244
1a9fc855	245	for (i = 0; i < num; i++) {
02b20b0b MCC	246	dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
	247	__func__, num, msgs[i].addr, msgs[i].len);
	248
1a9fc855	249	if (msgs[i].flags & I2C_M_RD) {
02b20b0b MCC	250	/* read */
02b20b0b MCC	251	retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
1a9fc855 MCC	252	} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
1a9fc855 MCC	253	msgs[i].addr == msgs[i + 1].addr) {
02b20b0b	254	/* write then read from same address */
1a9fc855 MCC	255	retval =
1a9fc855 MCC	256	i2c_sendbytes(i2c_adap, &msgs[i], msgs[i + 1].len);
02b20b0b MCC	257
	258	if (retval < 0)
	259	goto err;
	260	i++;
	261	retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
1a9fc855	262	} else {
02b20b0b MCC	263	/* write */
	264	retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
	265	}
bb4c9a74	266
02b20b0b MCC	267	if (retval < 0)
	268	goto err;
	269	}
	270	return num;
	271
51e9dd32	272	err:
02b20b0b	273	return retval;
1a9fc855	274	}
02b20b0b MCC	275
	276
	277	static u32 cx25821_functionality(struct i2c_adapter *adap)
	278	{
bb4c9a74	279	return I2C_FUNC_SMBUS_EMUL \|
1a9fc855 MCC	280	I2C_FUNC_I2C \|
	281	I2C_FUNC_SMBUS_WORD_DATA \|
	282	I2C_FUNC_SMBUS_READ_WORD_DATA \| I2C_FUNC_SMBUS_WRITE_WORD_DATA;
02b20b0b MCC	283	}
	284
	285	static struct i2c_algorithm cx25821_i2c_algo_template = {
1a9fc855 MCC	286	.master_xfer = i2c_xfer,
1a9fc855 MCC	287	.functionality = cx25821_functionality,
6d8c2ba1	288	#ifdef NEED_ALGO_CONTROL
e4115bb2	289	.algo_control = dummy_algo_control,
6d8c2ba1	290	#endif
02b20b0b MCC	291	};
02b20b0b MCC	292
02b20b0b	293	static struct i2c_adapter cx25821_i2c_adap_template = {
1a9fc855 MCC	294	.name = "cx25821",
1a9fc855 MCC	295	.owner = THIS_MODULE,
1a9fc855	296	.algo = &cx25821_i2c_algo_template,
02b20b0b MCC	297	};
	298
	299	static struct i2c_client cx25821_i2c_client_template = {
1a9fc855	300	.name = "cx25821 internal",
02b20b0b MCC	301	};
	302
	303	/* init + register i2c algo-bit adapter */
	304	int cx25821_i2c_register(struct cx25821_i2c *bus)
	305	{
	306	struct cx25821_dev *dev = bus->dev;
	307
	308	dprintk(1, "%s(bus = %d)\n", __func__, bus->nr);
	309
	310	memcpy(&bus->i2c_adap, &cx25821_i2c_adap_template,
	311	sizeof(bus->i2c_adap));
	312	memcpy(&bus->i2c_algo, &cx25821_i2c_algo_template,
	313	sizeof(bus->i2c_algo));
	314	memcpy(&bus->i2c_client, &cx25821_i2c_client_template,
	315	sizeof(bus->i2c_client));
	316
	317	bus->i2c_adap.dev.parent = &dev->pci->dev;
	318
	319	strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name));
	320
	321	bus->i2c_algo.data = bus;
1a9fc855	322	bus->i2c_adap.algo_data = bus;
02b20b0b MCC	323	i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
	324	i2c_add_adapter(&bus->i2c_adap);
	325
	326	bus->i2c_client.adapter = &bus->i2c_adap;
	327
51e9dd32	328	/* set up the I2c */
1a9fc855	329	bus->i2c_client.addr = (0x88 >> 1);
bb4c9a74	330
02b20b0b MCC	331	return bus->i2c_rc;
	332	}
	333
	334	int cx25821_i2c_unregister(struct cx25821_i2c *bus)
	335	{
	336	i2c_del_adapter(&bus->i2c_adap);
	337	return 0;
	338	}
	339
	340	void cx25821_av_clk(struct cx25821_dev *dev, int enable)
	341	{
	342	/* write 0 to bus 2 addr 0x144 via i2x_xfer() */
	343	char buffer[3];
	344	struct i2c_msg msg;
	345	dprintk(1, "%s(enabled = %d)\n", __func__, enable);
	346
	347	/* Register 0x144 */
	348	buffer[0] = 0x01;
	349	buffer[1] = 0x44;
	350	if (enable == 1)
	351	buffer[2] = 0x05;
	352	else
	353	buffer[2] = 0x00;
	354
	355	msg.addr = 0x44;
	356	msg.flags = I2C_M_TEN;
	357	msg.len = 3;
	358	msg.buf = buffer;
	359
	360	i2c_xfer(&dev->i2c_bus[0].i2c_adap, &msg, 1);
	361	}
	362
02b20b0b MCC	363	int cx25821_i2c_read(struct cx25821_i2c bus, u16 reg_addr, int value)
02b20b0b MCC	364	{
1a9fc855 MCC	365	struct i2c_client *client = &bus->i2c_client;
	366	int retval = 0;
	367	int v = 0;
	368	u8 addr[2] = { 0, 0 };
	369	u8 buf[4] = { 0, 0, 0, 0 };
02b20b0b	370
1a9fc855 MCC	371	struct i2c_msg msgs[2] = {
1a9fc855 MCC	372	{
7bfcbd67 LF	373	.addr = client->addr,
	374	.flags = 0,
	375	.len = 2,
	376	.buf = addr,
	377	}, {
	378	.addr = client->addr,
	379	.flags = I2C_M_RD,
	380	.len = 4,
	381	.buf = buf,
	382	}
1a9fc855 MCC	383	};
	384
	385	addr[0] = (reg_addr >> 8);
	386	addr[1] = (reg_addr & 0xff);
	387	msgs[0].addr = 0x44;
	388	msgs[1].addr = 0x44;
	389
	390	retval = i2c_xfer(client->adapter, msgs, 2);
	391
	392	v = (buf[3] << 24) \| (buf[2] << 16) \| (buf[1] << 8) \| buf[0];
	393	*value = v;
	394
	395	return v;
	396	}
02b20b0b MCC	397
	398	int cx25821_i2c_write(struct cx25821_i2c *bus, u16 reg_addr, int value)
	399	{
1a9fc855 MCC	400	struct i2c_client *client = &bus->i2c_client;
	401	int retval = 0;
	402	u8 buf[6] = { 0, 0, 0, 0, 0, 0 };
	403
	404	struct i2c_msg msgs[1] = {
	405	{
7bfcbd67 LF	406	.addr = client->addr,
	407	.flags = 0,
	408	.len = 6,
	409	.buf = buf,
	410	}
1a9fc855 MCC	411	};
	412
	413	buf[0] = reg_addr >> 8;
	414	buf[1] = reg_addr & 0xff;
	415	buf[5] = (value >> 24) & 0xff;
	416	buf[4] = (value >> 16) & 0xff;
	417	buf[3] = (value >> 8) & 0xff;
	418	buf[2] = value & 0xff;
	419	client->flags = 0;
	420	msgs[0].addr = 0x44;
	421
	422	retval = i2c_xfer(client->adapter, msgs, 1);
02b20b0b	423
1a9fc855 MCC	424	return retval;
1a9fc855 MCC	425	}