Re: [PATCH v2] input: bma150: Only claim to support the bma180 if the separate iio bma180 driver is not build

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Mon, Nov 14, 2016 at 02:11:14PM +0100, Hans de Goede wrote:
> commit ef3714fdbc8d ("Input: bma150 - extend chip detection for bma180"),
> adds bma180 chip-ids to the input bma150 driver, assuming that they are
> 100% compatible, but the bma180 is not compatible with the bma150 at all,
> it has 14 bits resolution instead of 10, and it has quite different
> control registers too.
> 
> Treating the bma180 as a bma150 wrt its data registers will just result
> in throwing away the lowest 4 bits, which is not too bad. But the ctrl
> registers are a different story. Things happen to just work but supporting
> that certainly does not make treating the bma180 the same as the bma150
> right.
> 
> Since some setups depend on the evdev interface the bma150 driver offers
> on top of the bma180, we cannot simply remove the bma180 ids.
> 
> So this commit only removes the bma180 id when the bma180 iio driver,
> which does treat the bma180 properly, is enabled.
> 
> Cc: Dr. H. Nikolaus Schaller <hns@goldelico.com>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Applied, thank you.

> ---
> Changes in v2:
> -Use IS_ENABLED(CONFIG_BMA180) instead of #ifdef CONFIG_BMA180
> ---
>  drivers/input/misc/bma150.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/input/misc/bma150.c b/drivers/input/misc/bma150.c
> index b0d4453..2124390 100644
> --- a/drivers/input/misc/bma150.c
> +++ b/drivers/input/misc/bma150.c
> @@ -538,8 +538,13 @@ static int bma150_probe(struct i2c_client *client,
>  		return -EIO;
>  	}
>  
> +	/*
> +	 * Note if the IIO CONFIG_BMA180 driver is enabled we want to fail
> +	 * the probe for the bma180 as the iio driver is preferred.
> +	 */
>  	chip_id = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG);
> -	if (chip_id != BMA150_CHIP_ID && chip_id != BMA180_CHIP_ID) {
> +	if (chip_id != BMA150_CHIP_ID &&
> +	    (IS_ENABLED(CONFIG_BMA180) || chip_id != BMA180_CHIP_ID)) {
>  		dev_err(&client->dev, "BMA150 chip id error: %d\n", chip_id);
>  		return -EINVAL;
>  	}
> @@ -643,7 +648,9 @@ static UNIVERSAL_DEV_PM_OPS(bma150_pm, bma150_suspend, bma150_resume, NULL);
>  
>  static const struct i2c_device_id bma150_id[] = {
>  	{ "bma150", 0 },
> +#if !IS_ENABLED(CONFIG_BMA180)
>  	{ "bma180", 0 },
> +#endif
>  	{ "smb380", 0 },
>  	{ "bma023", 0 },
>  	{ }
> -- 
> 2.9.3
> 

-- 
Dmitry