Re: [alsa-devel] [PATCH v2 2/2] gpio: Use new GPIO_LINE_DIRECTION

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Wed, Nov 06, 2019 at 10:54:12AM +0200, Matti Vaittinen wrote:
> It's hard for occasional GPIO code reader/writer to know if values 0/1
> equal to IN or OUT. Use defined GPIO_LINE_DIRECTION_IN and
> GPIO_LINE_DIRECTION_OUT to help them out.
> 
> NOTE - for gpio-amd-fch and gpio-bd9571mwv:
> This commit also changes the return value for direction get to equal 1
> for direction INPUT. Prior this commit these drivers might have
> returned some other positive value but 1 for INPUT.

>  drivers/gpio/gpio-ich.c             |  5 ++++-

>  drivers/gpio/gpio-merrifield.c      |  5 ++++-

>  drivers/gpio/gpio-pca953x.c         |  5 ++++-

>  drivers/gpio/gpio-sch.c             |  5 ++++-

>  drivers/gpio/gpio-wcove.c           |  7 +++++--

Since maintainers seems in favour of this and bloat-o-meter shows no difference
on selected module,

Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

for the stuff I'm involved in.

Thanks!

> diff --git a/drivers/gpio/gpio-ich.c b/drivers/gpio/gpio-ich.c
> index 90bf7742f9b0..2f086d0aa1f4 100644
> --- a/drivers/gpio/gpio-ich.c
> +++ b/drivers/gpio/gpio-ich.c
> @@ -159,7 +159,10 @@ static bool ichx_gpio_check_available(struct gpio_chip *gpio, unsigned nr)
>  
>  static int ichx_gpio_get_direction(struct gpio_chip *gpio, unsigned nr)
>  {
> -	return ichx_read_bit(GPIO_IO_SEL, nr);
> +	if (ichx_read_bit(GPIO_IO_SEL, nr))
> +		return GPIO_LINE_DIRECTION_IN;
> +
> +	return GPIO_LINE_DIRECTION_OUT;
>  }
>  
>  static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)

> diff --git a/drivers/gpio/gpio-merrifield.c b/drivers/gpio/gpio-merrifield.c
> index 2f1e9da81c1e..d4fa6e9560f3 100644
> --- a/drivers/gpio/gpio-merrifield.c
> +++ b/drivers/gpio/gpio-merrifield.c
> @@ -162,7 +162,10 @@ static int mrfld_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
>  {
>  	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
>  
> -	return !(readl(gpdr) & BIT(offset % 32));
> +	if (readl(gpdr) & BIT(offset % 32))
> +		return GPIO_LINE_DIRECTION_OUT;
> +
> +	return GPIO_LINE_DIRECTION_IN;
>  }
>  
>  static int mrfld_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,

> diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
> index de5d1383f28d..82122c3c688a 100644
> --- a/drivers/gpio/gpio-pca953x.c
> +++ b/drivers/gpio/gpio-pca953x.c
> @@ -449,7 +449,10 @@ static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
>  	if (ret < 0)
>  		return ret;
>  
> -	return !!(reg_val & bit);
> +	if (reg_val & bit)
> +		return GPIO_LINE_DIRECTION_IN;
> +
> +	return GPIO_LINE_DIRECTION_OUT;
>  }
>  
>  static void pca953x_gpio_set_multiple(struct gpio_chip *gc,

> diff --git a/drivers/gpio/gpio-sch.c b/drivers/gpio/gpio-sch.c
> index fb143f28c386..c65f35b68202 100644
> --- a/drivers/gpio/gpio-sch.c
> +++ b/drivers/gpio/gpio-sch.c
> @@ -127,7 +127,10 @@ static int sch_gpio_get_direction(struct gpio_chip *gc, unsigned gpio_num)
>  {
>  	struct sch_gpio *sch = gpiochip_get_data(gc);
>  
> -	return sch_gpio_reg_get(sch, gpio_num, GIO);
> +	if (sch_gpio_reg_get(sch, gpio_num, GIO))
> +		return GPIO_LINE_DIRECTION_IN;
> +
> +	return GPIO_LINE_DIRECTION_OUT;
>  }
>  
>  static const struct gpio_chip sch_gpio_chip = {

> diff --git a/drivers/gpio/gpio-wcove.c b/drivers/gpio/gpio-wcove.c
> index 444fe9e7f04a..8b481b3c1ebe 100644
> --- a/drivers/gpio/gpio-wcove.c
> +++ b/drivers/gpio/gpio-wcove.c
> @@ -170,13 +170,16 @@ static int wcove_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio)
>  	int ret, reg = to_reg(gpio, CTRL_OUT);
>  
>  	if (reg < 0)
> -		return 0;
> +		return GPIO_LINE_DIRECTION_OUT;
>  
>  	ret = regmap_read(wg->regmap, reg, &val);
>  	if (ret)
>  		return ret;
>  
> -	return !(val & CTLO_DIR_OUT);
> +	if (val & CTLO_DIR_OUT)
> +		return GPIO_LINE_DIRECTION_OUT;
> +
> +	return GPIO_LINE_DIRECTION_IN;
>  }
>  
>  static int wcove_gpio_get(struct gpio_chip *chip, unsigned int gpio)


-- 
With Best Regards,
Andy Shevchenko


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