[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / pci / 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.

*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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 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) {
		pr_cont(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
	}

	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)
			pr_cont(" %02x", msg->buf[cnt]);
	}
	if (!(xmit & BT878_I2C_NOSTOP))
		pr_cont(">\n");
	return msg->len;

 eio:
	retval = -EIO;
 err:
	if (i2c_debug)
		pr_cont(" 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;

		if (i2c_debug) {
			if (!(xmit & BT878_I2C_NOSTART))
				pr_cont(" <R %02x", (msg->addr << 1) +1);
		}

		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) {
			pr_cont(" =%02x", msg->buf[cnt]);
		}
		if (i2c_debug && !(xmit & BT878_I2C_NOSTOP))
			pr_cont(" >\n");
	}


	return msg->len;

 eio:
	retval = -EIO;
 err:
	if (i2c_debug)
		pr_cont(" 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)
		pr_debug("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)
		pr_info("%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)
				pr_cont("not found\n");
		} else
			pr_warn("%d: i2c read 0x%x: error\n",
				btv->c.nr, addr);
		return -1;
	}
	if (bttv_verbose && NULL != probe_for)
		pr_cont("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 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;
		pr_info("%s: i2c scan: found device @ 0x%x  [%s]\n",
			name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
	}
}

/* init + register i2c adapter */
int 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
8af443e5 JP	30	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8af443e5 JP	31
1da177e4	32	#include <linux/module.h>
1da177e4 LT	33	#include <linux/init.h>
1da177e4 LT	34	#include <linux/delay.h>
1da177e4 LT	35
1da177e4 LT	36	#include "bttvp.h"
5e453dc7	37	#include <media/v4l2-common.h>
b5b8ab8d MCC	38	#include <linux/jiffies.h>
b5b8ab8d MCC	39	#include <asm/io.h>
1da177e4	40
a5ed425c MCC	41	static int i2c_debug;
	42	static int i2c_hw;
	43	static int i2c_scan;
1da177e4	44	module_param(i2c_debug, int, 0644);
0a25f3b2	45	MODULE_PARM_DESC(i2c_debug, "configure i2c debug level");
1da177e4	46	module_param(i2c_hw, int, 0444);
141276b5 MCC	47	MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
141276b5 MCC	48	"instead of software bitbang");
1da177e4 LT	49	module_param(i2c_scan, int, 0444);
	50	MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
	51
141276b5 MCC	52	static unsigned int i2c_udelay = 5;
	53	module_param(i2c_udelay, int, 0444);
	54	MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
	55	"(should be 5 or higher). Lower value means higher bus speed.");
	56
1da177e4 LT	57	/* ----------------------------------------------------------------------- */
	58	/* I2C functions - bitbanging adapter (software i2c) */
	59
	60	static void bttv_bit_setscl(void *data, int state)
	61	{
	62	struct bttv btv = (struct bttv)data;
	63
	64	if (state)
	65	btv->i2c_state \|= 0x02;
	66	else
	67	btv->i2c_state &= ~0x02;
	68	btwrite(btv->i2c_state, BT848_I2C);
	69	btread(BT848_I2C);
	70	}
	71
	72	static void bttv_bit_setsda(void *data, int state)
	73	{
	74	struct bttv btv = (struct bttv)data;
	75
	76	if (state)
	77	btv->i2c_state \|= 0x01;
	78	else
	79	btv->i2c_state &= ~0x01;
	80	btwrite(btv->i2c_state, BT848_I2C);
	81	btread(BT848_I2C);
	82	}
	83
	84	static int bttv_bit_getscl(void *data)
	85	{
	86	struct bttv btv = (struct bttv)data;
	87	int state;
	88
	89	state = btread(BT848_I2C) & 0x02 ? 1 : 0;
	90	return state;
	91	}
	92
	93	static int bttv_bit_getsda(void *data)
	94	{
	95	struct bttv btv = (struct bttv)data;
	96	int state;
	97
	98	state = btread(BT848_I2C) & 0x01;
	99	return state;
	100	}
	101
4c62e976	102	static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = {
1da177e4 LT	103	.setsda = bttv_bit_setsda,
	104	.setscl = bttv_bit_setscl,
	105	.getsda = bttv_bit_getsda,
	106	.getscl = bttv_bit_getscl,
	107	.udelay = 16,
1da177e4 LT	108	.timeout = 200,
	109	};
	110
1da177e4 LT	111	/* ----------------------------------------------------------------------- */
	112	/* I2C functions - hardware i2c */
	113
1da177e4 LT	114	static u32 functionality(struct i2c_adapter *adap)
	115	{
	116	return I2C_FUNC_SMBUS_EMUL;
	117	}
	118
	119	static int
	120	bttv_i2c_wait_done(struct bttv *btv)
	121	{
1da177e4 LT	122	int rc = 0;
1da177e4 LT	123
fc9d53af MA	124	/* timeout */
fc9d53af MA	125	if (wait_event_interruptible_timeout(btv->i2c_queue,
3074fc84 JL	126	btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
3074fc84 JL	127	rc = -EIO;
1da177e4	128
1da177e4 LT	129	if (btv->i2c_done & BT848_INT_RACK)
	130	rc = 1;
	131	btv->i2c_done = 0;
	132	return rc;
	133	}
	134
	135	#define I2C_HW (BT878_I2C_MODE \| BT848_I2C_SYNC \|\
	136	BT848_I2C_SCL \| BT848_I2C_SDA)
	137
	138	static int
	139	bttv_i2c_sendbytes(struct bttv btv, const struct i2c_msg msg, int last)
	140	{
	141	u32 xmit;
	142	int retval,cnt;
	143
	144	/* sanity checks */
	145	if (0 == msg->len)
	146	return -EINVAL;
	147
	148	/* start, address + first byte */
	149	xmit = (msg->addr << 25) \| (msg->buf[0] << 16) \| I2C_HW;
	150	if (msg->len > 1 \|\| !last)
	151	xmit \|= BT878_I2C_NOSTOP;
	152	btwrite(xmit, BT848_I2C);
	153	retval = bttv_i2c_wait_done(btv);
	154	if (retval < 0)
	155	goto err;
	156	if (retval == 0)
	157	goto eio;
	158	if (i2c_debug) {
8af443e5	159	pr_cont(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
1da177e4 LT	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;
8af443e5 JP	173	if (i2c_debug)
8af443e5 JP	174	pr_cont(" %02x", msg->buf[cnt]);
1da177e4	175	}
8af443e5 JP	176	if (!(xmit & BT878_I2C_NOSTOP))
8af443e5 JP	177	pr_cont(">\n");
1da177e4 LT	178	return msg->len;
	179
	180	eio:
	181	retval = -EIO;
	182	err:
	183	if (i2c_debug)
8af443e5	184	pr_cont(" ERR: %d\n",retval);
1da177e4 LT	185	return retval;
	186	}
	187
	188	static int
	189	bttv_i2c_readbytes(struct bttv btv, const struct i2c_msg msg, int last)
	190	{
	191	u32 xmit;
	192	u32 cnt;
	193	int retval;
	194
8af443e5	195	for (cnt = 0; cnt < msg->len; cnt++) {
1da177e4 LT	196	xmit = (msg->addr << 25) \| (1 << 24) \| I2C_HW;
	197	if (cnt < msg->len-1)
	198	xmit \|= BT848_I2C_W3B;
	199	if (cnt < msg->len-1 \|\| !last)
	200	xmit \|= BT878_I2C_NOSTOP;
	201	if (cnt)
	202	xmit \|= BT878_I2C_NOSTART;
8af443e5 JP	203
	204	if (i2c_debug) {
	205	if (!(xmit & BT878_I2C_NOSTART))
	206	pr_cont(" <R %02x", (msg->addr << 1) +1);
	207	}
	208
1da177e4 LT	209	btwrite(xmit, BT848_I2C);
	210	retval = bttv_i2c_wait_done(btv);
	211	if (retval < 0)
	212	goto err;
	213	if (retval == 0)
	214	goto eio;
	215	msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
	216	if (i2c_debug) {
8af443e5	217	pr_cont(" =%02x", msg->buf[cnt]);
1da177e4	218	}
8af443e5 JP	219	if (i2c_debug && !(xmit & BT878_I2C_NOSTOP))
8af443e5 JP	220	pr_cont(" >\n");
1da177e4	221	}
8af443e5 JP	222
8af443e5 JP	223
1da177e4 LT	224	return msg->len;
	225
	226	eio:
	227	retval = -EIO;
	228	err:
	229	if (i2c_debug)
8af443e5	230	pr_cont(" ERR: %d\n",retval);
4ac97914	231	return retval;
1da177e4 LT	232	}
	233
	234	static int bttv_i2c_xfer(struct i2c_adapter i2c_adap, struct i2c_msg msgs, int num)
	235	{
74fc7bd9 HV	236	struct v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap);
74fc7bd9 HV	237	struct bttv *btv = to_bttv(v4l2_dev);
1da177e4 LT	238	int retval = 0;
	239	int i;
	240
	241	if (i2c_debug)
8af443e5 JP	242	pr_debug("bt-i2c:");
8af443e5 JP	243
1da177e4 LT	244	btwrite(BT848_INT_I2CDONE\|BT848_INT_RACK, BT848_INT_STAT);
	245	for (i = 0 ; i < num; i++) {
	246	if (msgs[i].flags & I2C_M_RD) {
	247	/* read */
	248	retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
	249	if (retval < 0)
	250	goto err;
	251	} else {
	252	/* write */
	253	retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
	254	if (retval < 0)
	255	goto err;
	256	}
	257	}
	258	return num;
	259
	260	err:
	261	return retval;
	262	}
	263
df9b5d4c	264	static const struct i2c_algorithm bttv_algo = {
1da177e4	265	.master_xfer = bttv_i2c_xfer,
1da177e4 LT	266	.functionality = functionality,
	267	};
	268
1da177e4 LT	269	/* ----------------------------------------------------------------------- */
	270	/* I2C functions - common stuff */
	271
1da177e4 LT	272	/* read I2C */
	273	int bttv_I2CRead(struct bttv btv, unsigned char addr, char probe_for)
	274	{
4ac97914	275	unsigned char buffer = 0;
1da177e4 LT	276
	277	if (0 != btv->i2c_rc)
	278	return -1;
	279	if (bttv_verbose && NULL != probe_for)
8af443e5 JP	280	pr_info("%d: i2c: checking for %s @ 0x%02x... ",
8af443e5 JP	281	btv->c.nr, probe_for, addr);
4ac97914 MCC	282	btv->i2c_client.addr = addr >> 1;
4ac97914 MCC	283	if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
1da177e4 LT	284	if (NULL != probe_for) {
1da177e4 LT	285	if (bttv_verbose)
8af443e5	286	pr_cont("not found\n");
1da177e4	287	} else
8af443e5 JP	288	pr_warn("%d: i2c read 0x%x: error\n",
8af443e5 JP	289	btv->c.nr, addr);
4ac97914	290	return -1;
1da177e4 LT	291	}
1da177e4 LT	292	if (bttv_verbose && NULL != probe_for)
8af443e5	293	pr_cont("found\n");
4ac97914	294	return buffer;
1da177e4 LT	295	}
	296
	297	/* write I2C */
	298	int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
4ac97914	299	unsigned char b2, int both)
1da177e4	300	{
4ac97914 MCC	301	unsigned char buffer[2];
4ac97914 MCC	302	int bytes = both ? 2 : 1;
1da177e4 LT	303
	304	if (0 != btv->i2c_rc)
	305	return -1;
4ac97914 MCC	306	btv->i2c_client.addr = addr >> 1;
	307	buffer[0] = b1;
	308	buffer[1] = b2;
	309	if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
1da177e4	310	return -1;
4ac97914	311	return 0;
1da177e4 LT	312	}
	313
	314	/* read EEPROM content */
4c62e976	315	void bttv_readee(struct bttv btv, unsigned char eedata, int addr)
1da177e4	316	{
5daf05fb GK	317	memset(eedata, 0, 256);
	318	if (0 != btv->i2c_rc)
	319	return;
1da177e4 LT	320	btv->i2c_client.addr = addr >> 1;
	321	tveeprom_read(&btv->i2c_client, eedata, 256);
	322	}
	323
	324	static char *i2c_devs[128] = {
24a70fdc	325	[ 0x1c >> 1 ] = "lgdt330x",
1da177e4 LT	326	[ 0x30 >> 1 ] = "IR (hauppauge)",
	327	[ 0x80 >> 1 ] = "msp34xx",
	328	[ 0x86 >> 1 ] = "tda9887",
	329	[ 0xa0 >> 1 ] = "eeprom",
	330	[ 0xc0 >> 1 ] = "tuner (analog)",
	331	[ 0xc2 >> 1 ] = "tuner (analog)",
	332	};
	333
	334	static void do_i2c_scan(char name, struct i2c_client c)
	335	{
	336	unsigned char buf;
	337	int i,rc;
	338
53c4e955	339	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
1da177e4 LT	340	c->addr = i;
	341	rc = i2c_master_recv(c,&buf,0);
	342	if (rc < 0)
	343	continue;
8af443e5 JP	344	pr_info("%s: i2c scan: found device @ 0x%x [%s]\n",
8af443e5 JP	345	name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
1da177e4 LT	346	}
	347	}
	348
a824f0f4	349	/* init + register i2c adapter */
4c62e976	350	int init_bttv_i2c(struct bttv *btv)
1da177e4	351	{
df9b5d4c	352	strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);
1da177e4 LT	353
	354	if (i2c_hw)
	355	btv->use_i2c_hw = 1;
	356	if (btv->use_i2c_hw) {
	357	/* bt878 */
df9b5d4c JD	358	strlcpy(btv->c.i2c_adap.name, "bt878",
df9b5d4c JD	359	sizeof(btv->c.i2c_adap.name));
df9b5d4c	360	btv->c.i2c_adap.algo = &bttv_algo;
1da177e4 LT	361	} else {
1da177e4 LT	362	/* bt848 */
141276b5 MCC	363	/* Prevents usage of invalid delay values */
	364	if (i2c_udelay<5)
	365	i2c_udelay=5;
141276b5	366
df9b5d4c JD	367	strlcpy(btv->c.i2c_adap.name, "bttv",
df9b5d4c JD	368	sizeof(btv->c.i2c_adap.name));
1da177e4 LT	369	memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
1da177e4 LT	370	sizeof(bttv_i2c_algo_bit_template));
df9b5d4c	371	btv->i2c_algo.udelay = i2c_udelay;
1da177e4 LT	372	btv->i2c_algo.data = btv;
	373	btv->c.i2c_adap.algo_data = &btv->i2c_algo;
	374	}
df9b5d4c	375	btv->c.i2c_adap.owner = THIS_MODULE;
1da177e4 LT	376
	377	btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
	378	snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
	379	"bt%d #%d [%s]", btv->id, btv->c.nr,
	380	btv->use_i2c_hw ? "hw" : "sw");
	381
74fc7bd9	382	i2c_set_adapdata(&btv->c.i2c_adap, &btv->c.v4l2_dev);
4ac97914	383	btv->i2c_client.adapter = &btv->c.i2c_adap;
1da177e4	384
1da177e4 LT	385
	386	if (btv->use_i2c_hw) {
	387	btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
	388	} else {
	389	bttv_bit_setscl(btv,1);
	390	bttv_bit_setsda(btv,1);
	391	btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
	392	}
	393	if (0 == btv->i2c_rc && i2c_scan)
74fc7bd9	394	do_i2c_scan(btv->c.v4l2_dev.name, &btv->i2c_client);
c668f32d	395
24344664 JD	396	return btv->i2c_rc;
24344664 JD	397	}