[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.
 *
 *  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 <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 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.
	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
89c21389	26	#include <linux/module.h>
02b20b0b	27	#include <linux/i2c.h>
89c21389	28	#include "cx25821.h"
02b20b0b	29
02b20b0b MCC	30	static unsigned int i2c_debug;
	31	module_param(i2c_debug, int, 0644);
	32	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
	33
bde4301d	34	static unsigned int i2c_scan;
02b20b0b MCC	35	module_param(i2c_scan, int, 0444);
	36	MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
	37
36d89f7d JP	38	#define dprintk(level, fmt, arg...) \
	39	do { \
	40	if (i2c_debug >= level) \
	41	printk(KERN_DEBUG "%s/0: " fmt, dev->name, ##arg); \
	42	} while (0)
02b20b0b MCC	43
	44	#define I2C_WAIT_DELAY 32
	45	#define I2C_WAIT_RETRY 64
	46
	47	#define I2C_EXTEND (1 << 3)
	48	#define I2C_NOSTOP (1 << 4)
	49
02b20b0b MCC	50	static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
	51	{
	52	struct cx25821_i2c *bus = i2c_adap->algo_data;
	53	struct cx25821_dev *dev = bus->dev;
	54	return cx_read(bus->reg_stat) & 0x01;
	55	}
	56
	57	static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
	58	{
	59	struct cx25821_i2c *bus = i2c_adap->algo_data;
	60	struct cx25821_dev *dev = bus->dev;
	61	return cx_read(bus->reg_stat) & 0x02 ? 1 : 0;
	62	}
	63
	64	static int i2c_wait_done(struct i2c_adapter *i2c_adap)
	65	{
	66	int count;
	67
	68	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	69	if (!i2c_is_busy(i2c_adap))
	70	break;
	71	udelay(I2C_WAIT_DELAY);
	72	}
	73
	74	if (I2C_WAIT_RETRY == count)
	75	return 0;
	76
	77	return 1;
	78	}
	79
1a9fc855 MCC	80	static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
1a9fc855 MCC	81	const struct i2c_msg *msg, int joined_rlen)
02b20b0b MCC	82	{
	83	struct cx25821_i2c *bus = i2c_adap->algo_data;
	84	struct cx25821_dev *dev = bus->dev;
	85	u32 wdata, addr, ctrl;
	86	int retval, cnt;
	87
	88	if (joined_rlen)
1a9fc855 MCC	89	dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__,
1a9fc855 MCC	90	msg->len, joined_rlen);
02b20b0b MCC	91	else
	92	dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
	93
	94	/* Deal with i2c probe functions with zero payload */
1a9fc855	95	if (msg->len == 0) {
bb4c9a74	96	cx_write(bus->reg_addr, msg->addr << 25);
02b20b0b MCC	97	cx_write(bus->reg_ctrl, bus->i2c_period \| (1 << 2));
	98
	99	if (!i2c_wait_done(i2c_adap))
	100	return -EIO;
	101
	102	if (!i2c_slave_did_ack(i2c_adap))
	103	return -EIO;
	104
36d89f7d	105	dprintk(1, "%s(): returns 0\n", __func__);
02b20b0b MCC	106	return 0;
	107	}
	108
	109	/* dev, reg + first byte */
	110	addr = (msg->addr << 25) \| msg->buf[0];
	111	wdata = msg->buf[0];
bb4c9a74	112
02b20b0b MCC	113	ctrl = bus->i2c_period \| (1 << 12) \| (1 << 2);
	114
	115	if (msg->len > 1)
	116	ctrl \|= I2C_NOSTOP \| I2C_EXTEND;
	117	else if (joined_rlen)
	118	ctrl \|= I2C_NOSTOP;
	119
	120	cx_write(bus->reg_addr, addr);
	121	cx_write(bus->reg_wdata, wdata);
	122	cx_write(bus->reg_ctrl, ctrl);
	123
	124	retval = i2c_wait_done(i2c_adap);
	125	if (retval < 0)
	126	goto err;
	127
	128	if (retval == 0)
	129	goto eio;
	130
1a9fc855	131	if (i2c_debug) {
02b20b0b MCC	132	if (!(ctrl & I2C_NOSTOP))
	133	printk(" >\n");
	134	}
	135
	136	for (cnt = 1; cnt < msg->len; cnt++) {
	137	/* following bytes */
	138	wdata = msg->buf[cnt];
	139	ctrl = bus->i2c_period \| (1 << 12) \| (1 << 2);
	140
	141	if (cnt < msg->len - 1)
	142	ctrl \|= I2C_NOSTOP \| I2C_EXTEND;
	143	else if (joined_rlen)
	144	ctrl \|= I2C_NOSTOP;
	145
	146	cx_write(bus->reg_addr, addr);
	147	cx_write(bus->reg_wdata, wdata);
	148	cx_write(bus->reg_ctrl, ctrl);
	149
	150	retval = i2c_wait_done(i2c_adap);
	151	if (retval < 0)
	152	goto err;
	153
	154	if (retval == 0)
	155	goto eio;
	156
1a9fc855	157	if (i2c_debug) {
02b20b0b MCC	158	dprintk(1, " %02x", msg->buf[cnt]);
	159	if (!(ctrl & I2C_NOSTOP))
	160	dprintk(1, " >\n");
	161	}
	162	}
bb4c9a74	163
02b20b0b MCC	164	return msg->len;
02b20b0b MCC	165
51e9dd32	166	eio:
02b20b0b	167	retval = -EIO;
51e9dd32	168	err:
02b20b0b	169	if (i2c_debug)
36d89f7d	170	pr_err(" ERR: %d\n", retval);
02b20b0b MCC	171	return retval;
	172	}
	173
1a9fc855 MCC	174	static int i2c_readbytes(struct i2c_adapter *i2c_adap,
1a9fc855 MCC	175	const struct i2c_msg *msg, int joined)
02b20b0b MCC	176	{
	177	struct cx25821_i2c *bus = i2c_adap->algo_data;
	178	struct cx25821_dev *dev = bus->dev;
	179	u32 ctrl, cnt;
	180	int retval;
	181
02b20b0b MCC	182	if (i2c_debug && !joined)
	183	dprintk(1, "6-%s(msg->len=%d)\n", __func__, msg->len);
	184
	185	/* Deal with i2c probe functions with zero payload */
	186	if (msg->len == 0) {
	187	cx_write(bus->reg_addr, msg->addr << 25);
	188	cx_write(bus->reg_ctrl, bus->i2c_period \| (1 << 2) \| 1);
	189	if (!i2c_wait_done(i2c_adap))
	190	return -EIO;
	191	if (!i2c_slave_did_ack(i2c_adap))
	192	return -EIO;
	193
36d89f7d	194	dprintk(1, "%s(): returns 0\n", __func__);
02b20b0b MCC	195	return 0;
	196	}
	197
	198	if (i2c_debug) {
	199	if (joined)
	200	dprintk(1, " R");
	201	else
	202	dprintk(1, " <R %02x", (msg->addr << 1) + 1);
	203	}
	204
	205	for (cnt = 0; cnt < msg->len; cnt++) {
	206
	207	ctrl = bus->i2c_period \| (1 << 12) \| (1 << 2) \| 1;
	208
	209	if (cnt < msg->len - 1)
	210	ctrl \|= I2C_NOSTOP \| I2C_EXTEND;
	211
02b20b0b MCC	212	cx_write(bus->reg_addr, msg->addr << 25);
	213	cx_write(bus->reg_ctrl, ctrl);
	214
	215	retval = i2c_wait_done(i2c_adap);
	216	if (retval < 0)
	217	goto err;
	218	if (retval == 0)
	219	goto eio;
	220	msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
	221
	222	if (i2c_debug) {
	223	dprintk(1, " %02x", msg->buf[cnt]);
	224	if (!(ctrl & I2C_NOSTOP))
	225	dprintk(1, " >\n");
	226	}
	227	}
	228
	229	return msg->len;
51e9dd32	230	eio:
02b20b0b	231	retval = -EIO;
51e9dd32	232	err:
02b20b0b	233	if (i2c_debug)
36d89f7d	234	pr_err(" ERR: %d\n", retval);
02b20b0b MCC	235	return retval;
	236	}
	237
	238	static int i2c_xfer(struct i2c_adapter i2c_adap, struct i2c_msg msgs, int num)
	239	{
	240	struct cx25821_i2c *bus = i2c_adap->algo_data;
	241	struct cx25821_dev *dev = bus->dev;
	242	int i, retval = 0;
	243
	244	dprintk(1, "%s(num = %d)\n", __func__, num);
	245
1a9fc855	246	for (i = 0; i < num; i++) {
02b20b0b MCC	247	dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
	248	__func__, num, msgs[i].addr, msgs[i].len);
	249
1a9fc855	250	if (msgs[i].flags & I2C_M_RD) {
02b20b0b MCC	251	/* read */
02b20b0b MCC	252	retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
1a9fc855 MCC	253	} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
1a9fc855 MCC	254	msgs[i].addr == msgs[i + 1].addr) {
02b20b0b	255	/* write then read from same address */
654d075d LF	256	retval = i2c_sendbytes(i2c_adap, &msgs[i],
654d075d LF	257	msgs[i + 1].len);
02b20b0b MCC	258
	259	if (retval < 0)
	260	goto err;
	261	i++;
	262	retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
1a9fc855	263	} else {
02b20b0b MCC	264	/* write */
	265	retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
	266	}
bb4c9a74	267
02b20b0b MCC	268	if (retval < 0)
	269	goto err;
	270	}
	271	return num;
	272
51e9dd32	273	err:
02b20b0b	274	return retval;
1a9fc855	275	}
02b20b0b MCC	276
	277
	278	static u32 cx25821_functionality(struct i2c_adapter *adap)
	279	{
654d075d LF	280	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_I2C \| I2C_FUNC_SMBUS_WORD_DATA \|
654d075d LF	281	I2C_FUNC_SMBUS_READ_WORD_DATA \| I2C_FUNC_SMBUS_WRITE_WORD_DATA;
02b20b0b MCC	282	}
	283
	284	static struct i2c_algorithm cx25821_i2c_algo_template = {
1a9fc855 MCC	285	.master_xfer = i2c_xfer,
1a9fc855 MCC	286	.functionality = cx25821_functionality,
6d8c2ba1	287	#ifdef NEED_ALGO_CONTROL
e4115bb2	288	.algo_control = dummy_algo_control,
6d8c2ba1	289	#endif
02b20b0b MCC	290	};
02b20b0b MCC	291
02b20b0b	292	static struct i2c_adapter cx25821_i2c_adap_template = {
1a9fc855 MCC	293	.name = "cx25821",
1a9fc855 MCC	294	.owner = THIS_MODULE,
1a9fc855	295	.algo = &cx25821_i2c_algo_template,
02b20b0b MCC	296	};
	297
	298	static struct i2c_client cx25821_i2c_client_template = {
1a9fc855	299	.name = "cx25821 internal",
02b20b0b MCC	300	};
02b20b0b MCC	301
a824f0f4	302	/* init + register i2c adapter */
02b20b0b MCC	303	int cx25821_i2c_register(struct cx25821_i2c *bus)
	304	{
	305	struct cx25821_dev *dev = bus->dev;
	306
	307	dprintk(1, "%s(bus = %d)\n", __func__, bus->nr);
	308
c21813e9 EG	309	bus->i2c_adap = cx25821_i2c_adap_template;
c21813e9 EG	310	bus->i2c_client = cx25821_i2c_client_template;
02b20b0b MCC	311	bus->i2c_adap.dev.parent = &dev->pci->dev;
	312
	313	strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name));
	314
1a9fc855	315	bus->i2c_adap.algo_data = bus;
02b20b0b MCC	316	i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
	317	i2c_add_adapter(&bus->i2c_adap);
	318
	319	bus->i2c_client.adapter = &bus->i2c_adap;
	320
51e9dd32	321	/* set up the I2c */
1a9fc855	322	bus->i2c_client.addr = (0x88 >> 1);
bb4c9a74	323
02b20b0b MCC	324	return bus->i2c_rc;
	325	}
	326
	327	int cx25821_i2c_unregister(struct cx25821_i2c *bus)
	328	{
	329	i2c_del_adapter(&bus->i2c_adap);
	330	return 0;
	331	}
	332
dafc456c MCC	333	#if 0 /* Currently unused */
dafc456c MCC	334	static void cx25821_av_clk(struct cx25821_dev *dev, int enable)
02b20b0b MCC	335	{
	336	/* write 0 to bus 2 addr 0x144 via i2x_xfer() */
	337	char buffer[3];
	338	struct i2c_msg msg;
	339	dprintk(1, "%s(enabled = %d)\n", __func__, enable);
	340
	341	/* Register 0x144 */
	342	buffer[0] = 0x01;
	343	buffer[1] = 0x44;
	344	if (enable == 1)
	345	buffer[2] = 0x05;
	346	else
	347	buffer[2] = 0x00;
	348
	349	msg.addr = 0x44;
	350	msg.flags = I2C_M_TEN;
	351	msg.len = 3;
	352	msg.buf = buffer;
	353
	354	i2c_xfer(&dev->i2c_bus[0].i2c_adap, &msg, 1);
	355	}
dafc456c	356	#endif
02b20b0b	357
02b20b0b MCC	358	int cx25821_i2c_read(struct cx25821_i2c bus, u16 reg_addr, int value)
02b20b0b MCC	359	{
1a9fc855	360	struct i2c_client *client = &bus->i2c_client;
1a9fc855 MCC	361	int v = 0;
	362	u8 addr[2] = { 0, 0 };
	363	u8 buf[4] = { 0, 0, 0, 0 };
02b20b0b	364
1a9fc855 MCC	365	struct i2c_msg msgs[2] = {
1a9fc855 MCC	366	{
7bfcbd67 LF	367	.addr = client->addr,
	368	.flags = 0,
	369	.len = 2,
	370	.buf = addr,
	371	}, {
	372	.addr = client->addr,
	373	.flags = I2C_M_RD,
	374	.len = 4,
	375	.buf = buf,
	376	}
1a9fc855 MCC	377	};
	378
	379	addr[0] = (reg_addr >> 8);
	380	addr[1] = (reg_addr & 0xff);
	381	msgs[0].addr = 0x44;
	382	msgs[1].addr = 0x44;
	383
30fdf035	384	i2c_xfer(client->adapter, msgs, 2);
1a9fc855 MCC	385
	386	v = (buf[3] << 24) \| (buf[2] << 16) \| (buf[1] << 8) \| buf[0];
	387	*value = v;
	388
	389	return v;
	390	}
02b20b0b MCC	391
	392	int cx25821_i2c_write(struct cx25821_i2c *bus, u16 reg_addr, int value)
	393	{
1a9fc855 MCC	394	struct i2c_client *client = &bus->i2c_client;
	395	int retval = 0;
	396	u8 buf[6] = { 0, 0, 0, 0, 0, 0 };
	397
	398	struct i2c_msg msgs[1] = {
	399	{
7bfcbd67 LF	400	.addr = client->addr,
	401	.flags = 0,
	402	.len = 6,
	403	.buf = buf,
	404	}
1a9fc855 MCC	405	};
	406
	407	buf[0] = reg_addr >> 8;
	408	buf[1] = reg_addr & 0xff;
	409	buf[5] = (value >> 24) & 0xff;
	410	buf[4] = (value >> 16) & 0xff;
	411	buf[3] = (value >> 8) & 0xff;
	412	buf[2] = value & 0xff;
	413	client->flags = 0;
	414	msgs[0].addr = 0x44;
	415
	416	retval = i2c_xfer(client->adapter, msgs, 1);
02b20b0b	417
1a9fc855 MCC	418	return retval;
1a9fc855 MCC	419	}