[PATCH RFT V2 1/3] iio: mxs-lradc: simplify TS registration

[Dmitry Torokhov]

On Thu, Apr 21, 2016 at 08:11:16PM +0000, Stefan Wahren wrote:
> This patch simplifies the TS registration of mxs-lradc by
> using devm_input_allocate_device.
> 
> Signed-off-by: Stefan Wahren <stefan.wahren at i2se.com>
> ---
>  drivers/iio/adc/mxs-lradc.c |    9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/iio/adc/mxs-lradc.c b/drivers/iio/adc/mxs-lradc.c
> index ad26da1..223650b 100644
> --- a/drivers/iio/adc/mxs-lradc.c
> +++ b/drivers/iio/adc/mxs-lradc.c
> @@ -1120,12 +1120,11 @@ static int mxs_lradc_ts_register(struct mxs_lradc *lradc)
>  {
>  	struct input_dev *input;
>  	struct device *dev = lradc->dev;
> -	int ret;
>  
>  	if (!lradc->use_touchscreen)
>  		return 0;
>  
> -	input = input_allocate_device();
> +	input = devm_input_allocate_device(dev);

Also please drop "input->dev.parent = dev;" below.

>  	if (!input)
>  		return -ENOMEM;
>  
> @@ -1146,11 +1145,8 @@ static int mxs_lradc_ts_register(struct mxs_lradc *lradc)
>  
>  	lradc->ts_input = input;
>  	input_set_drvdata(input, lradc);
> -	ret = input_register_device(input);
> -	if (ret)
> -		input_free_device(lradc->ts_input);
>  
> -	return ret;
> +	return input_register_device(input);
>  }
>  
>  static void mxs_lradc_ts_unregister(struct mxs_lradc *lradc)
> @@ -1159,7 +1155,6 @@ static void mxs_lradc_ts_unregister(struct mxs_lradc *lradc)
>  		return;
>  
>  	mxs_lradc_disable_ts(lradc);

I do not think this is needed, since mxs_lradc_ts_close() does this for
us (and it will be called automatically if input device is open at
unregistration time), and if you remove this you can remove
mxs_lradc_ts_unregister() altogether.

> -	input_unregister_device(lradc->ts_input);
>  }
>  
>  /*
> -- 
> 1.7.9.5
> 

Thanks.

-- 
Dmitry