Re: [PATCH v4 3/8] iio: mcp4531: provide range of available raw values

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On 08/11/16 11:58, Peter Rosin wrote:
> Example:
> 
> $ cat '/sys/bus/iio/devices/iio:device0/out_resistance_raw_available'
> [0 1 256]
> 
> Meaning: min 0, step 1 and max 256.
> 
> Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
Applied.
> ---
>  .../testing/sysfs-bus-iio-potentiometer-mcp4531    |   8 ++
>  MAINTAINERS                                        |   1 +
>  drivers/iio/potentiometer/mcp4531.c                | 104 ++++++++++++---------
>  3 files changed, 71 insertions(+), 42 deletions(-)
>  create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-potentiometer-mcp4531
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-potentiometer-mcp4531 b/Documentation/ABI/testing/sysfs-bus-iio-potentiometer-mcp4531
> new file mode 100644
> index 000000000000..2a91fbe394fc
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-iio-potentiometer-mcp4531
> @@ -0,0 +1,8 @@
> +What:		/sys/bus/iio/devices/iio:deviceX/out_resistance_raw_available
> +Date:		October 2016
> +KernelVersion:	4.9
> +Contact:	Peter Rosin <peda@xxxxxxxxxx>
> +Description:
> +		The range of available values represented as the minimum value,
> +		the step and the maximum value, all enclosed in square brackets.
> +		Example: [0 1 256]
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 411e3b87b8c2..2409e1d79cb6 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -7707,6 +7707,7 @@ MCP4531 MICROCHIP DIGITAL POTENTIOMETER DRIVER
>  M:	Peter Rosin <peda@xxxxxxxxxx>
>  L:	linux-iio@xxxxxxxxxxxxxxx
>  S:	Maintained
> +F:	Documentation/ABI/testing/sysfs-bus-iio-potentiometer-mcp4531
>  F:	drivers/iio/potentiometer/mcp4531.c
>  
>  MEASUREMENT COMPUTING CIO-DAC IIO DRIVER
> diff --git a/drivers/iio/potentiometer/mcp4531.c b/drivers/iio/potentiometer/mcp4531.c
> index 13b6ae2fcf7b..0d1bcf89ae17 100644
> --- a/drivers/iio/potentiometer/mcp4531.c
> +++ b/drivers/iio/potentiometer/mcp4531.c
> @@ -38,7 +38,7 @@
>  
>  struct mcp4531_cfg {
>  	int wipers;
> -	int max_pos;
> +	int avail[3];
>  	int kohms;
>  };
>  
> @@ -78,38 +78,38 @@ enum mcp4531_type {
>  };
>  
>  static const struct mcp4531_cfg mcp4531_cfg[] = {
> -	[MCP453x_502] = { .wipers = 1, .max_pos = 128, .kohms =   5, },
> -	[MCP453x_103] = { .wipers = 1, .max_pos = 128, .kohms =  10, },
> -	[MCP453x_503] = { .wipers = 1, .max_pos = 128, .kohms =  50, },
> -	[MCP453x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
> -	[MCP454x_502] = { .wipers = 1, .max_pos = 128, .kohms =   5, },
> -	[MCP454x_103] = { .wipers = 1, .max_pos = 128, .kohms =  10, },
> -	[MCP454x_503] = { .wipers = 1, .max_pos = 128, .kohms =  50, },
> -	[MCP454x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
> -	[MCP455x_502] = { .wipers = 1, .max_pos = 256, .kohms =   5, },
> -	[MCP455x_103] = { .wipers = 1, .max_pos = 256, .kohms =  10, },
> -	[MCP455x_503] = { .wipers = 1, .max_pos = 256, .kohms =  50, },
> -	[MCP455x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
> -	[MCP456x_502] = { .wipers = 1, .max_pos = 256, .kohms =   5, },
> -	[MCP456x_103] = { .wipers = 1, .max_pos = 256, .kohms =  10, },
> -	[MCP456x_503] = { .wipers = 1, .max_pos = 256, .kohms =  50, },
> -	[MCP456x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
> -	[MCP463x_502] = { .wipers = 2, .max_pos = 128, .kohms =   5, },
> -	[MCP463x_103] = { .wipers = 2, .max_pos = 128, .kohms =  10, },
> -	[MCP463x_503] = { .wipers = 2, .max_pos = 128, .kohms =  50, },
> -	[MCP463x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
> -	[MCP464x_502] = { .wipers = 2, .max_pos = 128, .kohms =   5, },
> -	[MCP464x_103] = { .wipers = 2, .max_pos = 128, .kohms =  10, },
> -	[MCP464x_503] = { .wipers = 2, .max_pos = 128, .kohms =  50, },
> -	[MCP464x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
> -	[MCP465x_502] = { .wipers = 2, .max_pos = 256, .kohms =   5, },
> -	[MCP465x_103] = { .wipers = 2, .max_pos = 256, .kohms =  10, },
> -	[MCP465x_503] = { .wipers = 2, .max_pos = 256, .kohms =  50, },
> -	[MCP465x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
> -	[MCP466x_502] = { .wipers = 2, .max_pos = 256, .kohms =   5, },
> -	[MCP466x_103] = { .wipers = 2, .max_pos = 256, .kohms =  10, },
> -	[MCP466x_503] = { .wipers = 2, .max_pos = 256, .kohms =  50, },
> -	[MCP466x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
> +	[MCP453x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms =   5, },
> +	[MCP453x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms =  10, },
> +	[MCP453x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms =  50, },
> +	[MCP453x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, },
> +	[MCP454x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms =   5, },
> +	[MCP454x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms =  10, },
> +	[MCP454x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms =  50, },
> +	[MCP454x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, },
> +	[MCP455x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms =   5, },
> +	[MCP455x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms =  10, },
> +	[MCP455x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms =  50, },
> +	[MCP455x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, },
> +	[MCP456x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms =   5, },
> +	[MCP456x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms =  10, },
> +	[MCP456x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms =  50, },
> +	[MCP456x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, },
> +	[MCP463x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms =   5, },
> +	[MCP463x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms =  10, },
> +	[MCP463x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms =  50, },
> +	[MCP463x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, },
> +	[MCP464x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms =   5, },
> +	[MCP464x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms =  10, },
> +	[MCP464x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms =  50, },
> +	[MCP464x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, },
> +	[MCP465x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms =   5, },
> +	[MCP465x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms =  10, },
> +	[MCP465x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms =  50, },
> +	[MCP465x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, },
> +	[MCP466x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms =   5, },
> +	[MCP466x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms =  10, },
> +	[MCP466x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms =  50, },
> +	[MCP466x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, },
>  };
>  
>  #define MCP4531_WRITE (0 << 2)
> @@ -124,13 +124,14 @@ struct mcp4531_data {
>  	const struct mcp4531_cfg *cfg;
>  };
>  
> -#define MCP4531_CHANNEL(ch) {					\
> -	.type = IIO_RESISTANCE,					\
> -	.indexed = 1,						\
> -	.output = 1,						\
> -	.channel = (ch),					\
> -	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
> -	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
> +#define MCP4531_CHANNEL(ch) {						\
> +	.type = IIO_RESISTANCE,						\
> +	.indexed = 1,							\
> +	.output = 1,							\
> +	.channel = (ch),						\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
> +	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),		\
> +	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_RAW),	\
>  }
>  
>  static const struct iio_chan_spec mcp4531_channels[] = {
> @@ -156,13 +157,31 @@ static int mcp4531_read_raw(struct iio_dev *indio_dev,
>  		return IIO_VAL_INT;
>  	case IIO_CHAN_INFO_SCALE:
>  		*val = 1000 * data->cfg->kohms;
> -		*val2 = data->cfg->max_pos;
> +		*val2 = data->cfg->avail[2];
>  		return IIO_VAL_FRACTIONAL;
>  	}
>  
>  	return -EINVAL;
>  }
>  
> +static int mcp4531_read_avail(struct iio_dev *indio_dev,
> +			      struct iio_chan_spec const *chan,
> +			      const int **vals, int *type, int *length,
> +			      long mask)
> +{
> +	struct mcp4531_data *data = iio_priv(indio_dev);
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +		*length = ARRAY_SIZE(data->cfg->avail);
> +		*vals = data->cfg->avail;
> +		*type = IIO_VAL_INT;
> +		return IIO_AVAIL_RANGE;
> +	}
> +
> +	return -EINVAL;
> +}
> +
>  static int mcp4531_write_raw(struct iio_dev *indio_dev,
>  			     struct iio_chan_spec const *chan,
>  			     int val, int val2, long mask)
> @@ -172,7 +191,7 @@ static int mcp4531_write_raw(struct iio_dev *indio_dev,
>  
>  	switch (mask) {
>  	case IIO_CHAN_INFO_RAW:
> -		if (val > data->cfg->max_pos || val < 0)
> +		if (val > data->cfg->avail[2] || val < 0)
>  			return -EINVAL;
>  		break;
>  	default:
> @@ -186,6 +205,7 @@ static int mcp4531_write_raw(struct iio_dev *indio_dev,
>  
>  static const struct iio_info mcp4531_info = {
>  	.read_raw = mcp4531_read_raw,
> +	.read_avail = mcp4531_read_avail,
>  	.write_raw = mcp4531_write_raw,
>  	.driver_module = THIS_MODULE,
>  };
> 

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