[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / video / bt8xx / bttv-i2c.c

/*

    bttv-i2c.c  --  all the i2c code is here

    bttv - Bt848 frame grabber driver

    Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
			   & Marcus Metzler (mocm@thp.uni-koeln.de)
    (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>

    (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
	- Multituner support and i2c address binding

    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/init.h>
#include <linux/delay.h>

#include "bttvp.h"
#include <media/v4l2-common.h>
#include <linux/jiffies.h>
#include <asm/io.h>

static int i2c_debug;
static int i2c_hw;
static int i2c_scan;
module_param(i2c_debug, int, 0644);
MODULE_PARM_DESC(i2c_debug, "configure i2c debug level");
module_param(i2c_hw,    int, 0444);
MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
			"instead of software bitbang");
module_param(i2c_scan,  int, 0444);
MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");

static unsigned int i2c_udelay = 5;
module_param(i2c_udelay, int, 0444);
MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
		"(should be 5 or higher). Lower value means higher bus speed.");

/* ----------------------------------------------------------------------- */
/* I2C functions - bitbanging adapter (software i2c)                       */

static void bttv_bit_setscl(void *data, int state)
{
	struct bttv *btv = (struct bttv*)data;

	if (state)
		btv->i2c_state |= 0x02;
	else
		btv->i2c_state &= ~0x02;
	btwrite(btv->i2c_state, BT848_I2C);
	btread(BT848_I2C);
}

static void bttv_bit_setsda(void *data, int state)
{
	struct bttv *btv = (struct bttv*)data;

	if (state)
		btv->i2c_state |= 0x01;
	else
		btv->i2c_state &= ~0x01;
	btwrite(btv->i2c_state, BT848_I2C);
	btread(BT848_I2C);
}

static int bttv_bit_getscl(void *data)
{
	struct bttv *btv = (struct bttv*)data;
	int state;

	state = btread(BT848_I2C) & 0x02 ? 1 : 0;
	return state;
}

static int bttv_bit_getsda(void *data)
{
	struct bttv *btv = (struct bttv*)data;
	int state;

	state = btread(BT848_I2C) & 0x01;
	return state;
}

static struct i2c_algo_bit_data __devinitdata bttv_i2c_algo_bit_template = {
	.setsda  = bttv_bit_setsda,
	.setscl  = bttv_bit_setscl,
	.getsda  = bttv_bit_getsda,
	.getscl  = bttv_bit_getscl,
	.udelay  = 16,
	.timeout = 200,
};

/* ----------------------------------------------------------------------- */
/* I2C functions - hardware i2c                                            */

static u32 functionality(struct i2c_adapter *adap)
{
	return I2C_FUNC_SMBUS_EMUL;
}

static int
bttv_i2c_wait_done(struct bttv *btv)
{
	int rc = 0;

	/* timeout */
	if (wait_event_interruptible_timeout(btv->i2c_queue,
	    btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
		rc = -EIO;

	if (btv->i2c_done & BT848_INT_RACK)
		rc = 1;
	btv->i2c_done = 0;
	return rc;
}

#define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
		BT848_I2C_SCL | BT848_I2C_SDA)

static int
bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
{
	u32 xmit;
	int retval,cnt;

	/* sanity checks */
	if (0 == msg->len)
		return -EINVAL;

	/* start, address + first byte */
	xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
	if (msg->len > 1 || !last)
		xmit |= BT878_I2C_NOSTOP;
	btwrite(xmit, BT848_I2C);
	retval = bttv_i2c_wait_done(btv);
	if (retval < 0)
		goto err;
	if (retval == 0)
		goto eio;
	if (i2c_debug) {
		printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
		if (!(xmit & BT878_I2C_NOSTOP))
			printk(" >\n");
	}

	for (cnt = 1; cnt < msg->len; cnt++ ) {
		/* following bytes */
		xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
		if (cnt < msg->len-1 || !last)
			xmit |= BT878_I2C_NOSTOP;
		btwrite(xmit, BT848_I2C);
		retval = bttv_i2c_wait_done(btv);
		if (retval < 0)
			goto err;
		if (retval == 0)
			goto eio;
		if (i2c_debug) {
			printk(" %02x", msg->buf[cnt]);
			if (!(xmit & BT878_I2C_NOSTOP))
				printk(" >\n");
		}
	}
	return msg->len;

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

static int
bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
{
	u32 xmit;
	u32 cnt;
	int retval;

	for(cnt = 0; cnt < msg->len; cnt++) {
		xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
		if (cnt < msg->len-1)
			xmit |= BT848_I2C_W3B;
		if (cnt < msg->len-1 || !last)
			xmit |= BT878_I2C_NOSTOP;
		if (cnt)
			xmit |= BT878_I2C_NOSTART;
		btwrite(xmit, BT848_I2C);
		retval = bttv_i2c_wait_done(btv);
		if (retval < 0)
			goto err;
		if (retval == 0)
			goto eio;
		msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
		if (i2c_debug) {
			if (!(xmit & BT878_I2C_NOSTART))
				printk(" <R %02x", (msg->addr << 1) +1);
			printk(" =%02x", msg->buf[cnt]);
			if (!(xmit & BT878_I2C_NOSTOP))
				printk(" >\n");
		}
	}
	return msg->len;

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

static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
{
	struct v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap);
	struct bttv *btv = to_bttv(v4l2_dev);
	int retval = 0;
	int i;

	if (i2c_debug)
		printk("bt-i2c:");
	btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
	for (i = 0 ; i < num; i++) {
		if (msgs[i].flags & I2C_M_RD) {
			/* read */
			retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
			if (retval < 0)
				goto err;
		} else {
			/* write */
			retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
			if (retval < 0)
				goto err;
		}
	}
	return num;

 err:
	return retval;
}

static const struct i2c_algorithm bttv_algo = {
	.master_xfer   = bttv_i2c_xfer,
	.functionality = functionality,
};

/* ----------------------------------------------------------------------- */
/* I2C functions - common stuff                                            */

/* read I2C */
int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
{
	unsigned char buffer = 0;

	if (0 != btv->i2c_rc)
		return -1;
	if (bttv_verbose && NULL != probe_for)
		printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
		       btv->c.nr,probe_for,addr);
	btv->i2c_client.addr = addr >> 1;
	if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
		if (NULL != probe_for) {
			if (bttv_verbose)
				printk("not found\n");
		} else
			printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
			       btv->c.nr,addr);
		return -1;
	}
	if (bttv_verbose && NULL != probe_for)
		printk("found\n");
	return buffer;
}

/* write I2C */
int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
		    unsigned char b2, int both)
{
	unsigned char buffer[2];
	int bytes = both ? 2 : 1;

	if (0 != btv->i2c_rc)
		return -1;
	btv->i2c_client.addr = addr >> 1;
	buffer[0] = b1;
	buffer[1] = b2;
	if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
		return -1;
	return 0;
}

/* read EEPROM content */
void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
{
	memset(eedata, 0, 256);
	if (0 != btv->i2c_rc)
		return;
	btv->i2c_client.addr = addr >> 1;
	tveeprom_read(&btv->i2c_client, eedata, 256);
}

static char *i2c_devs[128] = {
	[ 0x1c >> 1 ] = "lgdt330x",
	[ 0x30 >> 1 ] = "IR (hauppauge)",
	[ 0x80 >> 1 ] = "msp34xx",
	[ 0x86 >> 1 ] = "tda9887",
	[ 0xa0 >> 1 ] = "eeprom",
	[ 0xc0 >> 1 ] = "tuner (analog)",
	[ 0xc2 >> 1 ] = "tuner (analog)",
};

static void do_i2c_scan(char *name, struct i2c_client *c)
{
	unsigned char buf;
	int i,rc;

	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
		c->addr = i;
		rc = i2c_master_recv(c,&buf,0);
		if (rc < 0)
			continue;
		printk("%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 __devinit init_bttv_i2c(struct bttv *btv)
{
	strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);

	if (i2c_hw)
		btv->use_i2c_hw = 1;
	if (btv->use_i2c_hw) {
		/* bt878 */
		strlcpy(btv->c.i2c_adap.name, "bt878",
			sizeof(btv->c.i2c_adap.name));
		btv->c.i2c_adap.algo = &bttv_algo;
	} else {
		/* bt848 */
	/* Prevents usage of invalid delay values */
		if (i2c_udelay<5)
			i2c_udelay=5;

		strlcpy(btv->c.i2c_adap.name, "bttv",
			sizeof(btv->c.i2c_adap.name));
		memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
		       sizeof(bttv_i2c_algo_bit_template));
		btv->i2c_algo.udelay = i2c_udelay;
		btv->i2c_algo.data = btv;
		btv->c.i2c_adap.algo_data = &btv->i2c_algo;
	}
	btv->c.i2c_adap.owner = THIS_MODULE;

	btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
	snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
		 "bt%d #%d [%s]", btv->id, btv->c.nr,
		 btv->use_i2c_hw ? "hw" : "sw");

	i2c_set_adapdata(&btv->c.i2c_adap, &btv->c.v4l2_dev);
	btv->i2c_client.adapter = &btv->c.i2c_adap;


	if (btv->use_i2c_hw) {
		btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
	} else {
		bttv_bit_setscl(btv,1);
		bttv_bit_setsda(btv,1);
		btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
	}
	if (0 == btv->i2c_rc && i2c_scan)
		do_i2c_scan(btv->c.v4l2_dev.name, &btv->i2c_client);

	return btv->i2c_rc;
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2
	3	bttv-i2c.c -- all the i2c code is here
	4
	5	bttv - Bt848 frame grabber driver
	6
	7	Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de)
4ac97914	8	& Marcus Metzler (mocm@thp.uni-koeln.de)
1da177e4 LT	9	(c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
1da177e4 LT	10
141276b5 MCC	11	(c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
	12	- Multituner support and i2c address binding
	13
1da177e4 LT	14	This program is free software; you can redistribute it and/or modify
	15	it under the terms of the GNU General Public License as published by
	16	the Free Software Foundation; either version 2 of the License, or
	17	(at your option) any later version.
	18
	19	This program is distributed in the hope that it will be useful,
	20	but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	GNU General Public License for more details.
	23
	24	You should have received a copy of the GNU General Public License
	25	along with this program; if not, write to the Free Software
	26	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	27
	28	*/
	29
	30	#include <linux/module.h>
1da177e4 LT	31	#include <linux/init.h>
1da177e4 LT	32	#include <linux/delay.h>
1da177e4 LT	33
1da177e4 LT	34	#include "bttvp.h"
5e453dc7	35	#include <media/v4l2-common.h>
b5b8ab8d MCC	36	#include <linux/jiffies.h>
b5b8ab8d MCC	37	#include <asm/io.h>
1da177e4	38
a5ed425c MCC	39	static int i2c_debug;
	40	static int i2c_hw;
	41	static int i2c_scan;
1da177e4	42	module_param(i2c_debug, int, 0644);
0a25f3b2	43	MODULE_PARM_DESC(i2c_debug, "configure i2c debug level");
1da177e4	44	module_param(i2c_hw, int, 0444);
141276b5 MCC	45	MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
141276b5 MCC	46	"instead of software bitbang");
1da177e4 LT	47	module_param(i2c_scan, int, 0444);
	48	MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
	49
141276b5 MCC	50	static unsigned int i2c_udelay = 5;
	51	module_param(i2c_udelay, int, 0444);
	52	MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
	53	"(should be 5 or higher). Lower value means higher bus speed.");
	54
1da177e4 LT	55	/* ----------------------------------------------------------------------- */
	56	/* I2C functions - bitbanging adapter (software i2c) */
	57
	58	static void bttv_bit_setscl(void *data, int state)
	59	{
	60	struct bttv btv = (struct bttv)data;
	61
	62	if (state)
	63	btv->i2c_state \|= 0x02;
	64	else
	65	btv->i2c_state &= ~0x02;
	66	btwrite(btv->i2c_state, BT848_I2C);
	67	btread(BT848_I2C);
	68	}
	69
	70	static void bttv_bit_setsda(void *data, int state)
	71	{
	72	struct bttv btv = (struct bttv)data;
	73
	74	if (state)
	75	btv->i2c_state \|= 0x01;
	76	else
	77	btv->i2c_state &= ~0x01;
	78	btwrite(btv->i2c_state, BT848_I2C);
	79	btread(BT848_I2C);
	80	}
	81
	82	static int bttv_bit_getscl(void *data)
	83	{
	84	struct bttv btv = (struct bttv)data;
	85	int state;
	86
	87	state = btread(BT848_I2C) & 0x02 ? 1 : 0;
	88	return state;
	89	}
	90
	91	static int bttv_bit_getsda(void *data)
	92	{
	93	struct bttv btv = (struct bttv)data;
	94	int state;
	95
	96	state = btread(BT848_I2C) & 0x01;
	97	return state;
	98	}
	99
df9b5d4c	100	static struct i2c_algo_bit_data __devinitdata bttv_i2c_algo_bit_template = {
1da177e4 LT	101	.setsda = bttv_bit_setsda,
	102	.setscl = bttv_bit_setscl,
	103	.getsda = bttv_bit_getsda,
	104	.getscl = bttv_bit_getscl,
	105	.udelay = 16,
1da177e4 LT	106	.timeout = 200,
	107	};
	108
1da177e4 LT	109	/* ----------------------------------------------------------------------- */
	110	/* I2C functions - hardware i2c */
	111
1da177e4 LT	112	static u32 functionality(struct i2c_adapter *adap)
	113	{
	114	return I2C_FUNC_SMBUS_EMUL;
	115	}
	116
	117	static int
	118	bttv_i2c_wait_done(struct bttv *btv)
	119	{
1da177e4 LT	120	int rc = 0;
1da177e4 LT	121
fc9d53af MA	122	/* timeout */
fc9d53af MA	123	if (wait_event_interruptible_timeout(btv->i2c_queue,
3074fc84 JL	124	btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
3074fc84 JL	125	rc = -EIO;
1da177e4	126
1da177e4 LT	127	if (btv->i2c_done & BT848_INT_RACK)
	128	rc = 1;
	129	btv->i2c_done = 0;
	130	return rc;
	131	}
	132
	133	#define I2C_HW (BT878_I2C_MODE \| BT848_I2C_SYNC \|\
	134	BT848_I2C_SCL \| BT848_I2C_SDA)
	135
	136	static int
	137	bttv_i2c_sendbytes(struct bttv btv, const struct i2c_msg msg, int last)
	138	{
	139	u32 xmit;
	140	int retval,cnt;
	141
	142	/* sanity checks */
	143	if (0 == msg->len)
	144	return -EINVAL;
	145
	146	/* start, address + first byte */
	147	xmit = (msg->addr << 25) \| (msg->buf[0] << 16) \| I2C_HW;
	148	if (msg->len > 1 \|\| !last)
	149	xmit \|= BT878_I2C_NOSTOP;
	150	btwrite(xmit, BT848_I2C);
	151	retval = bttv_i2c_wait_done(btv);
	152	if (retval < 0)
	153	goto err;
	154	if (retval == 0)
	155	goto eio;
	156	if (i2c_debug) {
	157	printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
	158	if (!(xmit & BT878_I2C_NOSTOP))
	159	printk(" >\n");
	160	}
	161
	162	for (cnt = 1; cnt < msg->len; cnt++ ) {
	163	/* following bytes */
	164	xmit = (msg->buf[cnt] << 24) \| I2C_HW \| BT878_I2C_NOSTART;
	165	if (cnt < msg->len-1 \|\| !last)
	166	xmit \|= BT878_I2C_NOSTOP;
	167	btwrite(xmit, BT848_I2C);
	168	retval = bttv_i2c_wait_done(btv);
	169	if (retval < 0)
	170	goto err;
	171	if (retval == 0)
	172	goto eio;
	173	if (i2c_debug) {
	174	printk(" %02x", msg->buf[cnt]);
	175	if (!(xmit & BT878_I2C_NOSTOP))
	176	printk(" >\n");
	177	}
	178	}
	179	return msg->len;
	180
	181	eio:
	182	retval = -EIO;
	183	err:
	184	if (i2c_debug)
	185	printk(" ERR: %d\n",retval);
	186	return retval;
	187	}
	188
	189	static int
	190	bttv_i2c_readbytes(struct bttv btv, const struct i2c_msg msg, int last)
191	{
192	u32 xmit;
193	u32 cnt;
194	int retval;
195
196	for(cnt = 0; cnt < msg->len; cnt++) {
197	xmit = (msg->addr << 25) \| (1 << 24) \| I2C_HW;
198	if (cnt < msg->len-1)
199	xmit \|= BT848_I2C_W3B;
200	if (cnt < msg->len-1 \|\| !last)
201	xmit \|= BT878_I2C_NOSTOP;
202	if (cnt)
203	xmit \|= BT878_I2C_NOSTART;
204	btwrite(xmit, BT848_I2C);
205	retval = bttv_i2c_wait_done(btv);
206	if (retval < 0)
207	goto err;
208	if (retval == 0)
209	goto eio;
210	msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
211	if (i2c_debug) {
212	if (!(xmit & BT878_I2C_NOSTART))
213	printk(" <R %02x", (msg->addr << 1) +1);
214	printk(" =%02x", msg->buf[cnt]);
215	if (!(xmit & BT878_I2C_NOSTOP))
216	printk(" >\n");
217	}
218	}
219	return msg->len;
220
221	eio:
222	retval = -EIO;
223	err:
224	if (i2c_debug)
225	printk(" ERR: %d\n",retval);
4ac97914	226	return retval;
1da177e4 LT	227	}
	228
	229	static int bttv_i2c_xfer(struct i2c_adapter i2c_adap, struct i2c_msg msgs, int num)
	230	{
74fc7bd9 HV	231	struct v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap);
74fc7bd9 HV	232	struct bttv *btv = to_bttv(v4l2_dev);
1da177e4 LT	233	int retval = 0;
	234	int i;
	235
	236	if (i2c_debug)
	237	printk("bt-i2c:");
	238	btwrite(BT848_INT_I2CDONE\|BT848_INT_RACK, BT848_INT_STAT);
	239	for (i = 0 ; i < num; i++) {
	240	if (msgs[i].flags & I2C_M_RD) {
	241	/* read */
	242	retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
	243	if (retval < 0)
	244	goto err;
	245	} else {
	246	/* write */
	247	retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
	248	if (retval < 0)
	249	goto err;
	250	}
	251	}
	252	return num;
	253
	254	err:
	255	return retval;
	256	}
	257
df9b5d4c	258	static const struct i2c_algorithm bttv_algo = {
1da177e4	259	.master_xfer = bttv_i2c_xfer,
1da177e4 LT	260	.functionality = functionality,
	261	};
	262
1da177e4 LT	263	/* ----------------------------------------------------------------------- */
	264	/* I2C functions - common stuff */
	265
1da177e4 LT	266	/* read I2C */
	267	int bttv_I2CRead(struct bttv btv, unsigned char addr, char probe_for)
	268	{
4ac97914	269	unsigned char buffer = 0;
1da177e4 LT	270
	271	if (0 != btv->i2c_rc)
	272	return -1;
	273	if (bttv_verbose && NULL != probe_for)
	274	printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
	275	btv->c.nr,probe_for,addr);
4ac97914 MCC	276	btv->i2c_client.addr = addr >> 1;
4ac97914 MCC	277	if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
1da177e4 LT	278	if (NULL != probe_for) {
	279	if (bttv_verbose)
	280	printk("not found\n");
	281	} else
	282	printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
	283	btv->c.nr,addr);
4ac97914	284	return -1;
1da177e4 LT	285	}
	286	if (bttv_verbose && NULL != probe_for)
	287	printk("found\n");
4ac97914	288	return buffer;
1da177e4 LT	289	}
	290
	291	/* write I2C */
	292	int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
4ac97914	293	unsigned char b2, int both)
1da177e4	294	{
4ac97914 MCC	295	unsigned char buffer[2];
4ac97914 MCC	296	int bytes = both ? 2 : 1;
1da177e4 LT	297
	298	if (0 != btv->i2c_rc)
	299	return -1;
4ac97914 MCC	300	btv->i2c_client.addr = addr >> 1;
	301	buffer[0] = b1;
	302	buffer[1] = b2;
	303	if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
1da177e4	304	return -1;
4ac97914	305	return 0;
1da177e4 LT	306	}
	307
	308	/* read EEPROM content */
	309	void __devinit bttv_readee(struct bttv btv, unsigned char eedata, int addr)
	310	{
5daf05fb GK	311	memset(eedata, 0, 256);
	312	if (0 != btv->i2c_rc)
	313	return;
1da177e4 LT	314	btv->i2c_client.addr = addr >> 1;
	315	tveeprom_read(&btv->i2c_client, eedata, 256);
	316	}
	317
	318	static char *i2c_devs[128] = {
24a70fdc	319	[ 0x1c >> 1 ] = "lgdt330x",
1da177e4 LT	320	[ 0x30 >> 1 ] = "IR (hauppauge)",
	321	[ 0x80 >> 1 ] = "msp34xx",
	322	[ 0x86 >> 1 ] = "tda9887",
	323	[ 0xa0 >> 1 ] = "eeprom",
	324	[ 0xc0 >> 1 ] = "tuner (analog)",
	325	[ 0xc2 >> 1 ] = "tuner (analog)",
	326	};
	327
	328	static void do_i2c_scan(char name, struct i2c_client c)
	329	{
	330	unsigned char buf;
	331	int i,rc;
	332
53c4e955	333	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
1da177e4 LT	334	c->addr = i;
	335	rc = i2c_master_recv(c,&buf,0);
	336	if (rc < 0)
	337	continue;
	338	printk("%s: i2c scan: found device @ 0x%x [%s]\n",
	339	name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
	340	}
	341	}
	342
	343	/* init + register i2c algo-bit adapter */
	344	int __devinit init_bttv_i2c(struct bttv *btv)
	345	{
df9b5d4c	346	strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);
1da177e4 LT	347
	348	if (i2c_hw)
	349	btv->use_i2c_hw = 1;
	350	if (btv->use_i2c_hw) {
	351	/* bt878 */
df9b5d4c JD	352	strlcpy(btv->c.i2c_adap.name, "bt878",
df9b5d4c JD	353	sizeof(btv->c.i2c_adap.name));
df9b5d4c	354	btv->c.i2c_adap.algo = &bttv_algo;
1da177e4 LT	355	} else {
1da177e4 LT	356	/* bt848 */
141276b5 MCC	357	/* Prevents usage of invalid delay values */
	358	if (i2c_udelay<5)
	359	i2c_udelay=5;
141276b5	360
df9b5d4c JD	361	strlcpy(btv->c.i2c_adap.name, "bttv",
df9b5d4c JD	362	sizeof(btv->c.i2c_adap.name));
1da177e4 LT	363	memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
1da177e4 LT	364	sizeof(bttv_i2c_algo_bit_template));
df9b5d4c	365	btv->i2c_algo.udelay = i2c_udelay;
1da177e4 LT	366	btv->i2c_algo.data = btv;
	367	btv->c.i2c_adap.algo_data = &btv->i2c_algo;
	368	}
df9b5d4c	369	btv->c.i2c_adap.owner = THIS_MODULE;
1da177e4 LT	370
	371	btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
	372	snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
	373	"bt%d #%d [%s]", btv->id, btv->c.nr,
	374	btv->use_i2c_hw ? "hw" : "sw");
	375
74fc7bd9	376	i2c_set_adapdata(&btv->c.i2c_adap, &btv->c.v4l2_dev);
4ac97914	377	btv->i2c_client.adapter = &btv->c.i2c_adap;
1da177e4	378
1da177e4 LT	379
	380	if (btv->use_i2c_hw) {
	381	btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
	382	} else {
	383	bttv_bit_setscl(btv,1);
	384	bttv_bit_setsda(btv,1);
	385	btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
	386	}
	387	if (0 == btv->i2c_rc && i2c_scan)
74fc7bd9	388	do_i2c_scan(btv->c.v4l2_dev.name, &btv->i2c_client);
c668f32d	389
24344664 JD	390	return btv->i2c_rc;
24344664 JD	391	}