Re: [PATCH v2 1/3] Input: axp20x-pek: use driver_data of platform_device_id instead of extended attributes

[Maxime Ripard <maxime.ripard@free-electrons.com>]

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On Wed, Jul 19, 2017 at 09:43:35AM +0200, Quentin Schulz wrote:
> To prepare an upcoming patch adding support for another PMIC that has
> different startup and shutdown time, use driver_data of
> platform_device_id instead of a fixed extended device attribute.
> 
> By doing so, we also remove a lot of nested structures that aren't
> useful.
> 
> With this patch, a new PMIC can be easily supported by just filling
> correctly its ax20x_info structure and adding a platform_device_id.
> 
> Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
> ---
>  drivers/input/misc/axp20x-pek.c | 131 +++++++++++++++++++++++++++-------------
>  1 file changed, 88 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/input/misc/axp20x-pek.c b/drivers/input/misc/axp20x-pek.c
> index 38c79ebff033..94c89fbeeeaa 100644
> --- a/drivers/input/misc/axp20x-pek.c
> +++ b/drivers/input/misc/axp20x-pek.c
> @@ -29,9 +29,17 @@
>  #define AXP20X_PEK_STARTUP_MASK		(0xc0)
>  #define AXP20X_PEK_SHUTDOWN_MASK	(0x03)
>  
> +struct axp20x_info {
> +	const struct axp20x_time *startup_time;
> +	unsigned int startup_mask;
> +	const struct axp20x_time *shutdown_time;
> +	unsigned int shutdown_mask;
> +};
> +
>  struct axp20x_pek {
>  	struct axp20x_dev *axp20x;
>  	struct input_dev *input;
> +	struct axp20x_info *info;
>  	int irq_dbr;
>  	int irq_dbf;
>  };
> @@ -55,31 +63,18 @@ static const struct axp20x_time shutdown_time[] = {
>  	{ .time = 10000, .idx = 3 },
>  };
>  
> -struct axp20x_pek_ext_attr {
> -	const struct axp20x_time *p_time;
> -	unsigned int mask;
> -};
> -
> -static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = {
> -	.p_time	= startup_time,
> -	.mask	= AXP20X_PEK_STARTUP_MASK,
> -};
> -
> -static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = {
> -	.p_time	= shutdown_time,
> -	.mask	= AXP20X_PEK_SHUTDOWN_MASK,
> +static const struct axp20x_info axp20x_info = {
> +	.startup_time = startup_time,
> +	.startup_mask = AXP20X_PEK_STARTUP_MASK,
> +	.shutdown_time = shutdown_time,
> +	.shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
>  };
>  
> -static struct axp20x_pek_ext_attr *get_axp_ext_attr(struct device_attribute *attr)
> -{
> -	return container_of(attr, struct dev_ext_attribute, attr)->var;
> -}
> -
>  static ssize_t axp20x_show_ext_attr(struct device *dev,
> -				    struct device_attribute *attr, char *buf)
> +				    const struct axp20x_time *time,
> +				    unsigned int mask, char *buf)
>  {
>  	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
> -	struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
>  	unsigned int val;
>  	int ret, i;
>  
> @@ -87,22 +82,42 @@ static ssize_t axp20x_show_ext_attr(struct device *dev,
>  	if (ret != 0)
>  		return ret;
>  
> -	val &= axp20x_ea->mask;
> -	val >>= ffs(axp20x_ea->mask) - 1;
> +	val &= mask;
> +	val >>= ffs(mask) - 1;
>  
>  	for (i = 0; i < 4; i++)
> -		if (val == axp20x_ea->p_time[i].idx)
> -			val = axp20x_ea->p_time[i].time;
> +		if (val == time[i].idx)
> +			val = time[i].time;
>  
>  	return sprintf(buf, "%u\n", val);
>  }
>  
> +static ssize_t axp20x_show_ext_attr_startup(struct device *dev,
> +					    struct device_attribute *attr,
> +					    char *buf)
> +{
> +	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
> +
> +	return axp20x_show_ext_attr(dev, axp20x_pek->info->startup_time,
> +				    axp20x_pek->info->startup_mask, buf);
> +}
> +
> +static ssize_t axp20x_show_ext_attr_shutdown(struct device *dev,
> +					     struct device_attribute *attr,
> +					     char *buf)
> +{
> +	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
> +
> +	return axp20x_show_ext_attr(dev, axp20x_pek->info->shutdown_time,
> +				    axp20x_pek->info->shutdown_mask, buf);
> +}
> +
>  static ssize_t axp20x_store_ext_attr(struct device *dev,
> -				     struct device_attribute *attr,
> -				     const char *buf, size_t count)
> +				     const struct axp20x_time *time,
> +				     unsigned int mask, const char *buf,
> +				     size_t count)
>  {
>  	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
> -	struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
>  	char val_str[20];
>  	size_t len;
>  	int ret, i;
> @@ -123,39 +138,53 @@ static ssize_t axp20x_store_ext_attr(struct device *dev,
>  	for (i = 3; i >= 0; i--) {
>  		unsigned int err;
>  
> -		err = abs(axp20x_ea->p_time[i].time - val);
> +		err = abs(time[i].time - val);
>  		if (err < best_err) {
>  			best_err = err;
> -			idx = axp20x_ea->p_time[i].idx;
> +			idx = time[i].idx;
>  		}
>  
>  		if (!err)
>  			break;
>  	}
>  
> -	idx <<= ffs(axp20x_ea->mask) - 1;
> -	ret = regmap_update_bits(axp20x_pek->axp20x->regmap,
> -				 AXP20X_PEK_KEY,
> -				 axp20x_ea->mask, idx);
> +	idx <<= ffs(mask) - 1;
> +	ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
> +				 mask, idx);
>  	if (ret != 0)
>  		return -EINVAL;
>  
>  	return count;
>  }
>  
> -static struct dev_ext_attribute axp20x_dev_attr_startup = {
> -	.attr	= __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
> -	.var	= &axp20x_pek_startup_ext_attr,
> -};
> +static ssize_t axp20x_store_ext_attr_startup(struct device *dev,
> +					     struct device_attribute *attr,
> +					     const char *buf, size_t count)
> +{
> +	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
>  
> -static struct dev_ext_attribute axp20x_dev_attr_shutdown = {
> -	.attr	= __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
> -	.var	= &axp20x_pek_shutdown_ext_attr,
> -};
> +	return axp20x_store_ext_attr(dev, axp20x_pek->info->startup_time,
> +				     axp20x_pek->info->startup_mask, buf,
> +				     count);
> +}
> +
> +static ssize_t axp20x_store_ext_attr_shutdown(struct device *dev,
> +					      struct device_attribute *attr,
> +					      const char *buf, size_t count)
> +{
> +	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
> +
> +	return axp20x_store_ext_attr(dev, axp20x_pek->info->shutdown_time,
> +				     axp20x_pek->info->shutdown_mask, buf,
> +				     count);
> +}
> +

All these functions should be renamed, they're not extended attributes
anymore.

> +DEVICE_ATTR(startup, 0644, axp20x_show_ext_attr_startup, axp20x_store_ext_attr_startup);
> +DEVICE_ATTR(shutdown, 0644, axp20x_show_ext_attr_shutdown, axp20x_store_ext_attr_shutdown);

Both these lines generate a warning under checkpatch for a line too
long. Please wrap them.

Looks good otherwise, thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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