tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Peter Rosin <peda@axentia.se>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
authored by
Peter Rosin
and committed by
Jonathan Cameron
2704e300
00c5f80c
+71
-42
+8
Documentation/ABI/testing/sysfs-bus-iio-potentiometer-mcp4531
+8
Documentation/ABI/testing/sysfs-bus-iio-potentiometer-mcp4531
···
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What: /sys/bus/iio/devices/iio:deviceX/out_resistance_raw_available
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Date: October 2016
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KernelVersion: 4.9
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Contact: Peter Rosin <peda@axentia.se>
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Description:
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The range of available values represented as the minimum value,
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the step and the maximum value, all enclosed in square brackets.
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Example: [0 1 256]
+1
MAINTAINERS
+1
MAINTAINERS
+62
-42
drivers/iio/potentiometer/mcp4531.c
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-42
drivers/iio/potentiometer/mcp4531.c
···
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struct mcp4531_cfg {
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int wipers;
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int max_pos;
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int avail[3];
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int kohms;
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};
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···
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};
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static const struct mcp4531_cfg mcp4531_cfg[] = {
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[MCP453x_502] = { .wipers = 1, .max_pos = 128, .kohms = 5, },
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[MCP453x_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
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[MCP453x_503] = { .wipers = 1, .max_pos = 128, .kohms = 50, },
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[MCP453x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
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[MCP454x_502] = { .wipers = 1, .max_pos = 128, .kohms = 5, },
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[MCP454x_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
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[MCP454x_503] = { .wipers = 1, .max_pos = 128, .kohms = 50, },
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[MCP454x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
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[MCP455x_502] = { .wipers = 1, .max_pos = 256, .kohms = 5, },
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[MCP455x_103] = { .wipers = 1, .max_pos = 256, .kohms = 10, },
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[MCP455x_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
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[MCP455x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
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[MCP456x_502] = { .wipers = 1, .max_pos = 256, .kohms = 5, },
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[MCP456x_103] = { .wipers = 1, .max_pos = 256, .kohms = 10, },
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[MCP456x_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
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[MCP456x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
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[MCP463x_502] = { .wipers = 2, .max_pos = 128, .kohms = 5, },
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[MCP463x_103] = { .wipers = 2, .max_pos = 128, .kohms = 10, },
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[MCP463x_503] = { .wipers = 2, .max_pos = 128, .kohms = 50, },
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[MCP463x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
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[MCP464x_502] = { .wipers = 2, .max_pos = 128, .kohms = 5, },
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[MCP464x_103] = { .wipers = 2, .max_pos = 128, .kohms = 10, },
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[MCP464x_503] = { .wipers = 2, .max_pos = 128, .kohms = 50, },
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[MCP464x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
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[MCP465x_502] = { .wipers = 2, .max_pos = 256, .kohms = 5, },
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[MCP465x_103] = { .wipers = 2, .max_pos = 256, .kohms = 10, },
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[MCP465x_503] = { .wipers = 2, .max_pos = 256, .kohms = 50, },
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[MCP465x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
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[MCP466x_502] = { .wipers = 2, .max_pos = 256, .kohms = 5, },
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[MCP466x_103] = { .wipers = 2, .max_pos = 256, .kohms = 10, },
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[MCP466x_503] = { .wipers = 2, .max_pos = 256, .kohms = 50, },
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[MCP466x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
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[MCP453x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 5, },
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[MCP453x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 10, },
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[MCP453x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 50, },
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[MCP453x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, },
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[MCP454x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 5, },
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[MCP454x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 10, },
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[MCP454x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 50, },
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[MCP454x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, },
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[MCP455x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 5, },
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[MCP455x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 10, },
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[MCP455x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 50, },
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[MCP455x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, },
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[MCP456x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 5, },
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[MCP456x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 10, },
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[MCP456x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 50, },
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[MCP456x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, },
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[MCP463x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 5, },
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[MCP463x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 10, },
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[MCP463x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 50, },
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[MCP463x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, },
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[MCP464x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 5, },
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[MCP464x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 10, },
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[MCP464x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 50, },
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[MCP464x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, },
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[MCP465x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 5, },
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[MCP465x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 10, },
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[MCP465x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 50, },
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[MCP465x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, },
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[MCP466x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 5, },
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[MCP466x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 10, },
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[MCP466x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 50, },
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[MCP466x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, },
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};
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#define MCP4531_WRITE (0 << 2)
···
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const struct mcp4531_cfg *cfg;
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};
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#define MCP4531_CHANNEL(ch) { \
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.type = IIO_RESISTANCE, \
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.indexed = 1, \
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.output = 1, \
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.channel = (ch), \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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#define MCP4531_CHANNEL(ch) { \
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.type = IIO_RESISTANCE, \
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.indexed = 1, \
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.output = 1, \
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.channel = (ch), \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_RAW), \
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}
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static const struct iio_chan_spec mcp4531_channels[] = {
···
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 1000 * data->cfg->kohms;
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*val2 = data->cfg->max_pos;
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*val2 = data->cfg->avail[2];
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return IIO_VAL_FRACTIONAL;
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}
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return -EINVAL;
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}
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static int mcp4531_read_avail(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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const int **vals, int *type, int *length,
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long mask)
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{
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struct mcp4531_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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*length = ARRAY_SIZE(data->cfg->avail);
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*vals = data->cfg->avail;
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*type = IIO_VAL_INT;
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return IIO_AVAIL_RANGE;
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}
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return -EINVAL;
···
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (val > data->cfg->max_pos || val < 0)
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if (val > data->cfg->avail[2] || val < 0)
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return -EINVAL;
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break;
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default:
···
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static const struct iio_info mcp4531_info = {
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.read_raw = mcp4531_read_raw,
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.read_avail = mcp4531_read_avail,
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.write_raw = mcp4531_write_raw,
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.driver_module = THIS_MODULE,
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};