Commit 2704e300 authored by Peter Rosin's avatar Peter Rosin Committed by Jonathan Cameron
Browse files

iio: mcp4531: provide range of available raw values 



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: default avatarPeter Rosin <peda@axentia.se>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 00c5f80c

Documentation/ABI/testing/sysfs-bus-iio-potentiometer-mcp4531

0 → 100644
+8 −0
Original line number Diff line number Diff line 
What:		/sys/bus/iio/devices/iio:deviceX/out_resistance_raw_available

Date:		October 2016

KernelVersion:	4.9

Contact:	Peter Rosin <peda@axentia.se>

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]

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -7709,6 +7709,7 @@ MCP4531 MICROCHIP DIGITAL POTENTIOMETER DRIVER 
M:	Peter Rosin <peda@axentia.se>

L:	linux-iio@vger.kernel.org

S:	Maintained

F:	Documentation/ABI/testing/sysfs-bus-iio-potentiometer-mcp4531

F:	drivers/iio/potentiometer/mcp4531.c



MEASUREMENT COMPUTING CIO-DAC IIO DRIVER

drivers/iio/potentiometer/mcp4531.c

+62 −42
Original line number Diff line number Diff line
@@ -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)
@@ -131,6 +131,7 @@ struct mcp4531_data { 
	.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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