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    Subject[PATCH 03/16] Add probe check for the tda9840.
    Date
    From: Hans Verkuil <hverkuil@xs4all.nl>

    - Add probe check for the tda9840 to prevent misdetection of a Micronas
    dpl3518a as a tda9840.

    Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
    Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
    ---

    drivers/media/video/tvaudio.c | 9 +++++++++
    1 files changed, 9 insertions(+), 0 deletions(-)

    diff --git a/drivers/media/video/tvaudio.c b/drivers/media/video/tvaudio.c
    index 6d03b9b..c8e5ad0 100644
    --- a/drivers/media/video/tvaudio.c
    +++ b/drivers/media/video/tvaudio.c
    @@ -390,6 +390,14 @@ static void tda9840_setmode(struct CHIPS
    chip_write(chip, TDA9840_SW, t);
    }

    +static int tda9840_checkit(struct CHIPSTATE *chip)
    +{
    + int rc;
    + rc = chip_read(chip);
    + /* lower 5 bits should be 0 */
    + return ((rc & 0x1f) == 0) ? 1 : 0;
    +}
    +
    /* ---------------------------------------------------------------------- */
    /* audio chip descriptions - defines+functions for tda985x */

    @@ -1264,6 +1272,7 @@ static struct CHIPDESC chiplist[] = {
    .addr_hi = I2C_TDA9840 >> 1,
    .registers = 5,

    + .checkit = tda9840_checkit,
    .getmode = tda9840_getmode,
    .setmode = tda9840_setmode,
    .checkmode = generic_checkmode,
    -
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