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

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/i2c.h>
#include "cx25821.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 const 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 adapter */
int cx25821_i2c_register(struct cx25821_i2c *bus)
{
	struct cx25821_dev *dev = bus->dev;

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

	bus->i2c_adap = cx25821_i2c_adap_template;
	bus->i2c_client = cx25821_i2c_client_template;
	bus->i2c_adap.dev.parent = &dev->pci->dev;

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

	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;
}

#if 0 /* Currently unused */
static 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);
}
#endif

int cx25821_i2c_read(struct cx25821_i2c *bus, u16 reg_addr, int *value)
{
	struct i2c_client *client = &bus->i2c_client;
	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;

	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.
1a9fc855 MCC	18	*/
1a9fc855 MCC	19
36d89f7d JP	20	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
36d89f7d JP	21
89c21389	22	#include <linux/module.h>
02b20b0b	23	#include <linux/i2c.h>
89c21389	24	#include "cx25821.h"
02b20b0b	25
02b20b0b MCC	26	static unsigned int i2c_debug;
	27	module_param(i2c_debug, int, 0644);
	28	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
	29
bde4301d	30	static unsigned int i2c_scan;
02b20b0b MCC	31	module_param(i2c_scan, int, 0444);
	32	MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
	33
36d89f7d JP	34	#define dprintk(level, fmt, arg...) \
	35	do { \
	36	if (i2c_debug >= level) \
	37	printk(KERN_DEBUG "%s/0: " fmt, dev->name, ##arg); \
	38	} while (0)
02b20b0b MCC	39
	40	#define I2C_WAIT_DELAY 32
	41	#define I2C_WAIT_RETRY 64
	42
	43	#define I2C_EXTEND (1 << 3)
	44	#define I2C_NOSTOP (1 << 4)
	45
02b20b0b MCC	46	static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
	47	{
	48	struct cx25821_i2c *bus = i2c_adap->algo_data;
	49	struct cx25821_dev *dev = bus->dev;
	50	return cx_read(bus->reg_stat) & 0x01;
	51	}
	52
	53	static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
	54	{
	55	struct cx25821_i2c *bus = i2c_adap->algo_data;
	56	struct cx25821_dev *dev = bus->dev;
	57	return cx_read(bus->reg_stat) & 0x02 ? 1 : 0;
	58	}
	59
	60	static int i2c_wait_done(struct i2c_adapter *i2c_adap)
	61	{
	62	int count;
	63
	64	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	65	if (!i2c_is_busy(i2c_adap))
	66	break;
	67	udelay(I2C_WAIT_DELAY);
	68	}
	69
	70	if (I2C_WAIT_RETRY == count)
	71	return 0;
	72
	73	return 1;
	74	}
	75
1a9fc855 MCC	76	static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
1a9fc855 MCC	77	const struct i2c_msg *msg, int joined_rlen)
02b20b0b MCC	78	{
	79	struct cx25821_i2c *bus = i2c_adap->algo_data;
	80	struct cx25821_dev *dev = bus->dev;
	81	u32 wdata, addr, ctrl;
	82	int retval, cnt;
	83
	84	if (joined_rlen)
1a9fc855 MCC	85	dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__,
1a9fc855 MCC	86	msg->len, joined_rlen);
02b20b0b MCC	87	else
	88	dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
	89
	90	/* Deal with i2c probe functions with zero payload */
1a9fc855	91	if (msg->len == 0) {
bb4c9a74	92	cx_write(bus->reg_addr, msg->addr << 25);
02b20b0b MCC	93	cx_write(bus->reg_ctrl, bus->i2c_period \| (1 << 2));
	94
	95	if (!i2c_wait_done(i2c_adap))
	96	return -EIO;
	97
	98	if (!i2c_slave_did_ack(i2c_adap))
	99	return -EIO;
	100
36d89f7d	101	dprintk(1, "%s(): returns 0\n", __func__);
02b20b0b MCC	102	return 0;
	103	}
	104
	105	/* dev, reg + first byte */
	106	addr = (msg->addr << 25) \| msg->buf[0];
	107	wdata = msg->buf[0];
bb4c9a74	108
02b20b0b MCC	109	ctrl = bus->i2c_period \| (1 << 12) \| (1 << 2);
	110
	111	if (msg->len > 1)
	112	ctrl \|= I2C_NOSTOP \| I2C_EXTEND;
	113	else if (joined_rlen)
	114	ctrl \|= I2C_NOSTOP;
	115
	116	cx_write(bus->reg_addr, addr);
	117	cx_write(bus->reg_wdata, wdata);
	118	cx_write(bus->reg_ctrl, ctrl);
	119
	120	retval = i2c_wait_done(i2c_adap);
	121	if (retval < 0)
	122	goto err;
	123
	124	if (retval == 0)
	125	goto eio;
	126
1a9fc855	127	if (i2c_debug) {
02b20b0b MCC	128	if (!(ctrl & I2C_NOSTOP))
	129	printk(" >\n");
	130	}
	131
	132	for (cnt = 1; cnt < msg->len; cnt++) {
	133	/* following bytes */
	134	wdata = msg->buf[cnt];
	135	ctrl = bus->i2c_period \| (1 << 12) \| (1 << 2);
	136
	137	if (cnt < msg->len - 1)
	138	ctrl \|= I2C_NOSTOP \| I2C_EXTEND;
	139	else if (joined_rlen)
	140	ctrl \|= I2C_NOSTOP;
	141
	142	cx_write(bus->reg_addr, addr);
	143	cx_write(bus->reg_wdata, wdata);
	144	cx_write(bus->reg_ctrl, ctrl);
	145
	146	retval = i2c_wait_done(i2c_adap);
	147	if (retval < 0)
	148	goto err;
	149
	150	if (retval == 0)
	151	goto eio;
	152
1a9fc855	153	if (i2c_debug) {
02b20b0b MCC	154	dprintk(1, " %02x", msg->buf[cnt]);
	155	if (!(ctrl & I2C_NOSTOP))
	156	dprintk(1, " >\n");
	157	}
	158	}
bb4c9a74	159
02b20b0b MCC	160	return msg->len;
02b20b0b MCC	161
51e9dd32	162	eio:
02b20b0b	163	retval = -EIO;
51e9dd32	164	err:
02b20b0b	165	if (i2c_debug)
36d89f7d	166	pr_err(" ERR: %d\n", retval);
02b20b0b MCC	167	return retval;
	168	}
	169
1a9fc855 MCC	170	static int i2c_readbytes(struct i2c_adapter *i2c_adap,
1a9fc855 MCC	171	const struct i2c_msg *msg, int joined)
02b20b0b MCC	172	{
	173	struct cx25821_i2c *bus = i2c_adap->algo_data;
	174	struct cx25821_dev *dev = bus->dev;
	175	u32 ctrl, cnt;
	176	int retval;
	177
02b20b0b MCC	178	if (i2c_debug && !joined)
	179	dprintk(1, "6-%s(msg->len=%d)\n", __func__, msg->len);
	180
	181	/* Deal with i2c probe functions with zero payload */
	182	if (msg->len == 0) {
	183	cx_write(bus->reg_addr, msg->addr << 25);
	184	cx_write(bus->reg_ctrl, bus->i2c_period \| (1 << 2) \| 1);
	185	if (!i2c_wait_done(i2c_adap))
	186	return -EIO;
	187	if (!i2c_slave_did_ack(i2c_adap))
	188	return -EIO;
	189
36d89f7d	190	dprintk(1, "%s(): returns 0\n", __func__);
02b20b0b MCC	191	return 0;
	192	}
	193
	194	if (i2c_debug) {
	195	if (joined)
	196	dprintk(1, " R");
	197	else
	198	dprintk(1, " <R %02x", (msg->addr << 1) + 1);
	199	}
	200
	201	for (cnt = 0; cnt < msg->len; cnt++) {
	202
	203	ctrl = bus->i2c_period \| (1 << 12) \| (1 << 2) \| 1;
	204
	205	if (cnt < msg->len - 1)
	206	ctrl \|= I2C_NOSTOP \| I2C_EXTEND;
	207
02b20b0b MCC	208	cx_write(bus->reg_addr, msg->addr << 25);
	209	cx_write(bus->reg_ctrl, ctrl);
	210
	211	retval = i2c_wait_done(i2c_adap);
	212	if (retval < 0)
	213	goto err;
	214	if (retval == 0)
	215	goto eio;
	216	msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
	217
	218	if (i2c_debug) {
	219	dprintk(1, " %02x", msg->buf[cnt]);
	220	if (!(ctrl & I2C_NOSTOP))
	221	dprintk(1, " >\n");
	222	}
	223	}
	224
	225	return msg->len;
51e9dd32	226	eio:
02b20b0b	227	retval = -EIO;
51e9dd32	228	err:
02b20b0b	229	if (i2c_debug)
36d89f7d	230	pr_err(" ERR: %d\n", retval);
02b20b0b MCC	231	return retval;
	232	}
	233
	234	static int i2c_xfer(struct i2c_adapter i2c_adap, struct i2c_msg msgs, int num)
	235	{
	236	struct cx25821_i2c *bus = i2c_adap->algo_data;
	237	struct cx25821_dev *dev = bus->dev;
	238	int i, retval = 0;
	239
	240	dprintk(1, "%s(num = %d)\n", __func__, num);
	241
1a9fc855	242	for (i = 0; i < num; i++) {
02b20b0b MCC	243	dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
	244	__func__, num, msgs[i].addr, msgs[i].len);
	245
1a9fc855	246	if (msgs[i].flags & I2C_M_RD) {
02b20b0b MCC	247	/* read */
02b20b0b MCC	248	retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
1a9fc855 MCC	249	} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
1a9fc855 MCC	250	msgs[i].addr == msgs[i + 1].addr) {
02b20b0b	251	/* write then read from same address */
654d075d LF	252	retval = i2c_sendbytes(i2c_adap, &msgs[i],
654d075d LF	253	msgs[i + 1].len);
02b20b0b MCC	254
	255	if (retval < 0)
	256	goto err;
	257	i++;
	258	retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
1a9fc855	259	} else {
02b20b0b MCC	260	/* write */
	261	retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
	262	}
bb4c9a74	263
02b20b0b MCC	264	if (retval < 0)
	265	goto err;
	266	}
	267	return num;
	268
51e9dd32	269	err:
02b20b0b	270	return retval;
1a9fc855	271	}
02b20b0b MCC	272
	273
	274	static u32 cx25821_functionality(struct i2c_adapter *adap)
	275	{
654d075d LF	276	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_I2C \| I2C_FUNC_SMBUS_WORD_DATA \|
654d075d LF	277	I2C_FUNC_SMBUS_READ_WORD_DATA \| I2C_FUNC_SMBUS_WRITE_WORD_DATA;
02b20b0b MCC	278	}
02b20b0b MCC	279
78f2c50b	280	static const struct i2c_algorithm cx25821_i2c_algo_template = {
1a9fc855 MCC	281	.master_xfer = i2c_xfer,
1a9fc855 MCC	282	.functionality = cx25821_functionality,
6d8c2ba1	283	#ifdef NEED_ALGO_CONTROL
e4115bb2	284	.algo_control = dummy_algo_control,
6d8c2ba1	285	#endif
02b20b0b MCC	286	};
02b20b0b MCC	287
02b20b0b	288	static struct i2c_adapter cx25821_i2c_adap_template = {
1a9fc855 MCC	289	.name = "cx25821",
1a9fc855 MCC	290	.owner = THIS_MODULE,
1a9fc855	291	.algo = &cx25821_i2c_algo_template,
02b20b0b MCC	292	};
	293
	294	static struct i2c_client cx25821_i2c_client_template = {
1a9fc855	295	.name = "cx25821 internal",
02b20b0b MCC	296	};
02b20b0b MCC	297
a824f0f4	298	/* init + register i2c adapter */
02b20b0b MCC	299	int cx25821_i2c_register(struct cx25821_i2c *bus)
	300	{
	301	struct cx25821_dev *dev = bus->dev;
	302
	303	dprintk(1, "%s(bus = %d)\n", __func__, bus->nr);
	304
c21813e9 EG	305	bus->i2c_adap = cx25821_i2c_adap_template;
c21813e9 EG	306	bus->i2c_client = cx25821_i2c_client_template;
02b20b0b MCC	307	bus->i2c_adap.dev.parent = &dev->pci->dev;
	308
	309	strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name));
	310
1a9fc855	311	bus->i2c_adap.algo_data = bus;
02b20b0b MCC	312	i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
	313	i2c_add_adapter(&bus->i2c_adap);
	314
	315	bus->i2c_client.adapter = &bus->i2c_adap;
	316
51e9dd32	317	/* set up the I2c */
1a9fc855	318	bus->i2c_client.addr = (0x88 >> 1);
bb4c9a74	319
02b20b0b MCC	320	return bus->i2c_rc;
	321	}
	322
	323	int cx25821_i2c_unregister(struct cx25821_i2c *bus)
	324	{
	325	i2c_del_adapter(&bus->i2c_adap);
	326	return 0;
	327	}
	328
dafc456c MCC	329	#if 0 /* Currently unused */
dafc456c MCC	330	static void cx25821_av_clk(struct cx25821_dev *dev, int enable)
02b20b0b MCC	331	{
	332	/* write 0 to bus 2 addr 0x144 via i2x_xfer() */
	333	char buffer[3];
	334	struct i2c_msg msg;
	335	dprintk(1, "%s(enabled = %d)\n", __func__, enable);
	336
	337	/* Register 0x144 */
	338	buffer[0] = 0x01;
	339	buffer[1] = 0x44;
	340	if (enable == 1)
	341	buffer[2] = 0x05;
	342	else
	343	buffer[2] = 0x00;
	344
	345	msg.addr = 0x44;
	346	msg.flags = I2C_M_TEN;
	347	msg.len = 3;
	348	msg.buf = buffer;
	349
	350	i2c_xfer(&dev->i2c_bus[0].i2c_adap, &msg, 1);
	351	}
dafc456c	352	#endif
02b20b0b	353
02b20b0b MCC	354	int cx25821_i2c_read(struct cx25821_i2c bus, u16 reg_addr, int value)
02b20b0b MCC	355	{
1a9fc855	356	struct i2c_client *client = &bus->i2c_client;
1a9fc855 MCC	357	int v = 0;
	358	u8 addr[2] = { 0, 0 };
	359	u8 buf[4] = { 0, 0, 0, 0 };
02b20b0b	360
1a9fc855 MCC	361	struct i2c_msg msgs[2] = {
1a9fc855 MCC	362	{
7bfcbd67 LF	363	.addr = client->addr,
	364	.flags = 0,
	365	.len = 2,
	366	.buf = addr,
	367	}, {
	368	.addr = client->addr,
	369	.flags = I2C_M_RD,
	370	.len = 4,
	371	.buf = buf,
	372	}
1a9fc855 MCC	373	};
	374
	375	addr[0] = (reg_addr >> 8);
	376	addr[1] = (reg_addr & 0xff);
	377	msgs[0].addr = 0x44;
	378	msgs[1].addr = 0x44;
	379
30fdf035	380	i2c_xfer(client->adapter, msgs, 2);
1a9fc855 MCC	381
	382	v = (buf[3] << 24) \| (buf[2] << 16) \| (buf[1] << 8) \| buf[0];
	383	*value = v;
	384
	385	return v;
	386	}
02b20b0b MCC	387
	388	int cx25821_i2c_write(struct cx25821_i2c *bus, u16 reg_addr, int value)
	389	{
1a9fc855 MCC	390	struct i2c_client *client = &bus->i2c_client;
	391	int retval = 0;
	392	u8 buf[6] = { 0, 0, 0, 0, 0, 0 };
	393
	394	struct i2c_msg msgs[1] = {
	395	{
7bfcbd67 LF	396	.addr = client->addr,
	397	.flags = 0,
	398	.len = 6,
	399	.buf = buf,
	400	}
1a9fc855 MCC	401	};
	402
	403	buf[0] = reg_addr >> 8;
	404	buf[1] = reg_addr & 0xff;
	405	buf[5] = (value >> 24) & 0xff;
	406	buf[4] = (value >> 16) & 0xff;
	407	buf[3] = (value >> 8) & 0xff;
	408	buf[2] = value & 0xff;
	409	client->flags = 0;
	410	msgs[0].addr = 0x44;
	411
	412	retval = i2c_xfer(client->adapter, msgs, 1);
02b20b0b	413
1a9fc855 MCC	414	return retval;
1a9fc855 MCC	415	}