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V4L/DVB: ov7670: Restore SMBUS I/O for the XO 1.0

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The Cafe controller doesn't do non-SMBUS I/O, so we have to use it there.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jonathan Corbet 2010-03-19 13:16:28 -03:00 committed by Mauro Carvalho Chehab
parent 364e93372f
commit 467142093d
1 changed files with 37 additions and 0 deletions
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37
drivers/media/video/ov7670.c
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@ -409,6 +409,42 @@ static struct regval_list ov7670_fmt_raw[] = {
/*
* Low-level register I/O.
*
* Note that there are two versions of these. On the XO 1, the
* i2c controller only does SMBUS, so that's what we use. The
* ov7670 is not really an SMBUS device, though, so the communication
* is not always entirely reliable.
*/
#ifdef CONFIG_OLPC_XO_1
static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
unsigned char *value)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret >= 0) {
*value = (unsigned char)ret;
ret = 0;
}
return ret;
}
static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
unsigned char value)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret = i2c_smbus_write_byte_data(client, reg, value);
if (reg == REG_COM7 && (value & COM7_RESET))
msleep(5); /* Wait for reset to run */
return ret;
}
#else /* ! CONFIG_OLPC_XO_1 */
/*
* On most platforms, we'd rather do straight i2c I/O.
*/
static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
unsigned char *value)
@ -462,6 +498,7 @@ static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
msleep(5); /* Wait for reset to run */
return ret;
}
#endif /* CONFIG_OLPC_XO_1 */
/*