Re: [PATCH 2/2] saa7115: add detection code for gm7113c

[Ezequiel Garcia <ezequiel.garcia@free-electrons.com>]

On Fri, Apr 26, 2013 at 09:49:17AM -0300, Mauro Carvalho Chehab wrote:
> Adds a code that (auto)detects gm7113c clones. The auto-detection
> here is not perfect, as, on contrary to what it would be expected
> by looking into its datasheets some devices would return, instead:
> 
> 	saa7115 0-0025: chip 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 @ 0x4a is unknown
> 
> (found on a device labeled as GM7113C 1145 by Ezequiel Garcia)
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
> ---
>  drivers/media/i2c/saa7115.c     | 36 ++++++++++++++++++++++++++++++++++++
>  include/media/v4l2-chip-ident.h |  2 ++
>  2 files changed, 38 insertions(+)
> 
> diff --git a/drivers/media/i2c/saa7115.c b/drivers/media/i2c/saa7115.c
> index 2bc8b72..24672a7 100644
> --- a/drivers/media/i2c/saa7115.c
> +++ b/drivers/media/i2c/saa7115.c
> @@ -1640,6 +1640,36 @@ static int saa711x_detect_chip(struct i2c_client *client,
>  		}
>  	}
>  
> +	/* Check if it is a gm1113c */

s/1113/7113

> +	if (!memcmp(name, "0000", 4)) {
> +		chip_id = 0;
> +		for (i = 0; i < 4; i++) {
> +			chip_id = chip_id << 1;
> +			chip_id |= (chip_ver[i] & 0x80) ? 1 : 0;
> +		}
> +
> +		/*
> +		 * Note: From the datasheet, only versions 1 and 2
> +		 * exists. However, tests on a device labeled as:
> +		 *	"GM7113C 1145" returned "10" on all 16 chip
> +		 *	version (reg 0x00) reads. So, we need to also
> +		 *	accept at least verion 0. For now, let's just
> +		 *	assume that a device that returns "0000" for
> +		 *	the lower nibble is a gm1113c.

Is this weird comment indentation correct?

And also:
s/1113/7113

> +		 */
> +
> +		snprintf(name, size, "gm1113c");

Ditto.

> +
> +		if (!autodetect && strcmp(name, id->name))
> +			return -EINVAL;
> +
> +		v4l_dbg(1, debug, client,
> +			"It seems to be a %s chip (%*ph) @ 0x%x.\n",
> +			name, 16, chip_ver, client->addr << 1);
> +
> +		return V4L2_IDENT_GM7113C;
> +	}
> +
>  	/* Chip was not discovered. Return its ID and don't bind */
>  	v4l_dbg(1, debug, client, "chip %*ph @ 0x%x is unknown.\n",
>  		16, chip_ver, client->addr << 1);
> @@ -1669,6 +1699,11 @@ static int saa711x_probe(struct i2c_client *client,
>  	if (ident < 0)
>  		return ident;
>  
> +	if (ident == V4L2_IDENT_GM7113C) {
> +		v4l_warn(client, "%s not yet supported\n", name);
> +		return -ENODEV;
> +	}
> +
>  	strlcpy(client->name, name, sizeof(client->name));
>  
>  	state = kzalloc(sizeof(struct saa711x_state), GFP_KERNEL);
> @@ -1756,6 +1791,7 @@ static const struct i2c_device_id saa711x_id[] = {
>  	{ "saa7114", 0 },
>  	{ "saa7115", 0 },
>  	{ "saa7118", 0 },
> +	{ "gm7113c", 0 },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(i2c, saa711x_id);
> diff --git a/include/media/v4l2-chip-ident.h b/include/media/v4l2-chip-ident.h
> index c259b36..543f89c 100644
> --- a/include/media/v4l2-chip-ident.h
> +++ b/include/media/v4l2-chip-ident.h
> @@ -52,6 +52,8 @@ enum {
>  	V4L2_IDENT_SAA7115 = 105,
>  	V4L2_IDENT_SAA7118 = 108,
>  
> +	V4L2_IDENT_GM7113C = 140,
> +
>  	/* module saa7127: reserved range 150-199 */
>  	V4L2_IDENT_SAA7127 = 157,
>  	V4L2_IDENT_SAA7129 = 159,
> -- 
> 1.8.1.4
> 

-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com