407 lines
14 KiB
C
Executable file
407 lines
14 KiB
C
Executable file
/*
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* Industrial I/O driver for Microchip digital potentiometers
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* Copyright (c) 2015 Axentia Technologies AB
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* Author: Peter Rosin <peda@axentia.se>
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*
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* Datasheet: http://www.microchip.com/downloads/en/DeviceDoc/22096b.pdf
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*
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* DEVID #Wipers #Positions Resistor Opts (kOhm) i2c address
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* mcp4531 1 129 5, 10, 50, 100 010111x
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* mcp4532 1 129 5, 10, 50, 100 01011xx
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* mcp4541 1 129 5, 10, 50, 100 010111x
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* mcp4542 1 129 5, 10, 50, 100 01011xx
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* mcp4551 1 257 5, 10, 50, 100 010111x
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* mcp4552 1 257 5, 10, 50, 100 01011xx
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* mcp4561 1 257 5, 10, 50, 100 010111x
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* mcp4562 1 257 5, 10, 50, 100 01011xx
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* mcp4631 2 129 5, 10, 50, 100 0101xxx
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* mcp4632 2 129 5, 10, 50, 100 01011xx
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* mcp4641 2 129 5, 10, 50, 100 0101xxx
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* mcp4642 2 129 5, 10, 50, 100 01011xx
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* mcp4651 2 257 5, 10, 50, 100 0101xxx
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* mcp4652 2 257 5, 10, 50, 100 01011xx
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* mcp4661 2 257 5, 10, 50, 100 0101xxx
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* mcp4662 2 257 5, 10, 50, 100 01011xx
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/iio/iio.h>
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struct mcp4531_cfg {
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int wipers;
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int avail[3];
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int kohms;
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};
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enum mcp4531_type {
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MCP453x_502,
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MCP453x_103,
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MCP453x_503,
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MCP453x_104,
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MCP454x_502,
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MCP454x_103,
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MCP454x_503,
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MCP454x_104,
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MCP455x_502,
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MCP455x_103,
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MCP455x_503,
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MCP455x_104,
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MCP456x_502,
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MCP456x_103,
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MCP456x_503,
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MCP456x_104,
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MCP463x_502,
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MCP463x_103,
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MCP463x_503,
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MCP463x_104,
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MCP464x_502,
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MCP464x_103,
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MCP464x_503,
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MCP464x_104,
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MCP465x_502,
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MCP465x_103,
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MCP465x_503,
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MCP465x_104,
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MCP466x_502,
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MCP466x_103,
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MCP466x_503,
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MCP466x_104,
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};
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static const struct mcp4531_cfg mcp4531_cfg[] = {
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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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#define MCP4531_INCR (1 << 2)
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#define MCP4531_DECR (2 << 2)
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#define MCP4531_READ (3 << 2)
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#define MCP4531_WIPER_SHIFT (4)
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struct mcp4531_data {
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struct i2c_client *client;
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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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.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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MCP4531_CHANNEL(0),
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MCP4531_CHANNEL(1),
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};
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static int mcp4531_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct mcp4531_data *data = iio_priv(indio_dev);
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int address = chan->channel << MCP4531_WIPER_SHIFT;
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s32 ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = i2c_smbus_read_word_swapped(data->client,
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MCP4531_READ | address);
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if (ret < 0)
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return ret;
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*val = ret;
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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->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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}
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static int mcp4531_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct mcp4531_data *data = iio_priv(indio_dev);
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int address = chan->channel << MCP4531_WIPER_SHIFT;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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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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return -EINVAL;
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}
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return i2c_smbus_write_byte_data(data->client,
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MCP4531_WRITE | address | (val >> 8),
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val & 0xff);
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}
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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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};
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static const struct i2c_device_id mcp4531_id[] = {
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{ "mcp4531-502", MCP453x_502 },
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{ "mcp4531-103", MCP453x_103 },
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{ "mcp4531-503", MCP453x_503 },
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{ "mcp4531-104", MCP453x_104 },
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{ "mcp4532-502", MCP453x_502 },
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{ "mcp4532-103", MCP453x_103 },
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{ "mcp4532-503", MCP453x_503 },
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{ "mcp4532-104", MCP453x_104 },
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{ "mcp4541-502", MCP454x_502 },
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{ "mcp4541-103", MCP454x_103 },
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{ "mcp4541-503", MCP454x_503 },
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{ "mcp4541-104", MCP454x_104 },
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{ "mcp4542-502", MCP454x_502 },
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{ "mcp4542-103", MCP454x_103 },
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{ "mcp4542-503", MCP454x_503 },
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{ "mcp4542-104", MCP454x_104 },
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{ "mcp4551-502", MCP455x_502 },
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{ "mcp4551-103", MCP455x_103 },
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{ "mcp4551-503", MCP455x_503 },
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{ "mcp4551-104", MCP455x_104 },
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{ "mcp4552-502", MCP455x_502 },
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{ "mcp4552-103", MCP455x_103 },
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{ "mcp4552-503", MCP455x_503 },
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{ "mcp4552-104", MCP455x_104 },
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{ "mcp4561-502", MCP456x_502 },
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{ "mcp4561-103", MCP456x_103 },
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{ "mcp4561-503", MCP456x_503 },
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{ "mcp4561-104", MCP456x_104 },
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{ "mcp4562-502", MCP456x_502 },
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{ "mcp4562-103", MCP456x_103 },
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{ "mcp4562-503", MCP456x_503 },
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{ "mcp4562-104", MCP456x_104 },
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{ "mcp4631-502", MCP463x_502 },
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{ "mcp4631-103", MCP463x_103 },
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{ "mcp4631-503", MCP463x_503 },
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{ "mcp4631-104", MCP463x_104 },
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{ "mcp4632-502", MCP463x_502 },
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{ "mcp4632-103", MCP463x_103 },
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{ "mcp4632-503", MCP463x_503 },
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{ "mcp4632-104", MCP463x_104 },
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{ "mcp4641-502", MCP464x_502 },
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{ "mcp4641-103", MCP464x_103 },
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{ "mcp4641-503", MCP464x_503 },
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{ "mcp4641-104", MCP464x_104 },
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{ "mcp4642-502", MCP464x_502 },
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{ "mcp4642-103", MCP464x_103 },
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{ "mcp4642-503", MCP464x_503 },
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{ "mcp4642-104", MCP464x_104 },
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{ "mcp4651-502", MCP465x_502 },
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{ "mcp4651-103", MCP465x_103 },
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{ "mcp4651-503", MCP465x_503 },
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{ "mcp4651-104", MCP465x_104 },
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{ "mcp4652-502", MCP465x_502 },
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{ "mcp4652-103", MCP465x_103 },
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{ "mcp4652-503", MCP465x_503 },
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{ "mcp4652-104", MCP465x_104 },
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{ "mcp4661-502", MCP466x_502 },
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{ "mcp4661-103", MCP466x_103 },
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{ "mcp4661-503", MCP466x_503 },
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{ "mcp4661-104", MCP466x_104 },
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{ "mcp4662-502", MCP466x_502 },
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{ "mcp4662-103", MCP466x_103 },
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{ "mcp4662-503", MCP466x_503 },
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{ "mcp4662-104", MCP466x_104 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, mcp4531_id);
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#ifdef CONFIG_OF
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#define MCP4531_COMPATIBLE(of_compatible, cfg) { \
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.compatible = of_compatible, \
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.data = &mcp4531_cfg[cfg], \
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}
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static const struct of_device_id mcp4531_of_match[] = {
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MCP4531_COMPATIBLE("microchip,mcp4531-502", MCP453x_502),
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MCP4531_COMPATIBLE("microchip,mcp4531-103", MCP453x_103),
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MCP4531_COMPATIBLE("microchip,mcp4531-503", MCP453x_503),
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MCP4531_COMPATIBLE("microchip,mcp4531-104", MCP453x_104),
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MCP4531_COMPATIBLE("microchip,mcp4532-502", MCP453x_502),
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MCP4531_COMPATIBLE("microchip,mcp4532-103", MCP453x_103),
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MCP4531_COMPATIBLE("microchip,mcp4532-503", MCP453x_503),
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MCP4531_COMPATIBLE("microchip,mcp4532-104", MCP453x_104),
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MCP4531_COMPATIBLE("microchip,mcp4541-502", MCP454x_502),
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MCP4531_COMPATIBLE("microchip,mcp4541-103", MCP454x_103),
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MCP4531_COMPATIBLE("microchip,mcp4541-503", MCP454x_503),
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MCP4531_COMPATIBLE("microchip,mcp4541-104", MCP454x_104),
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MCP4531_COMPATIBLE("microchip,mcp4542-502", MCP454x_502),
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MCP4531_COMPATIBLE("microchip,mcp4542-103", MCP454x_103),
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MCP4531_COMPATIBLE("microchip,mcp4542-503", MCP454x_503),
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MCP4531_COMPATIBLE("microchip,mcp4542-104", MCP454x_104),
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MCP4531_COMPATIBLE("microchip,mcp4551-502", MCP455x_502),
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MCP4531_COMPATIBLE("microchip,mcp4551-103", MCP455x_103),
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MCP4531_COMPATIBLE("microchip,mcp4551-503", MCP455x_503),
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MCP4531_COMPATIBLE("microchip,mcp4551-104", MCP455x_104),
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MCP4531_COMPATIBLE("microchip,mcp4552-502", MCP455x_502),
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MCP4531_COMPATIBLE("microchip,mcp4552-103", MCP455x_103),
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MCP4531_COMPATIBLE("microchip,mcp4552-503", MCP455x_503),
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MCP4531_COMPATIBLE("microchip,mcp4552-104", MCP455x_104),
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MCP4531_COMPATIBLE("microchip,mcp4561-502", MCP456x_502),
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MCP4531_COMPATIBLE("microchip,mcp4561-103", MCP456x_103),
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MCP4531_COMPATIBLE("microchip,mcp4561-503", MCP456x_503),
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MCP4531_COMPATIBLE("microchip,mcp4561-104", MCP456x_104),
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MCP4531_COMPATIBLE("microchip,mcp4562-502", MCP456x_502),
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MCP4531_COMPATIBLE("microchip,mcp4562-103", MCP456x_103),
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MCP4531_COMPATIBLE("microchip,mcp4562-503", MCP456x_503),
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MCP4531_COMPATIBLE("microchip,mcp4562-104", MCP456x_104),
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MCP4531_COMPATIBLE("microchip,mcp4631-502", MCP463x_502),
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MCP4531_COMPATIBLE("microchip,mcp4631-103", MCP463x_103),
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MCP4531_COMPATIBLE("microchip,mcp4631-503", MCP463x_503),
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MCP4531_COMPATIBLE("microchip,mcp4631-104", MCP463x_104),
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MCP4531_COMPATIBLE("microchip,mcp4632-502", MCP463x_502),
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MCP4531_COMPATIBLE("microchip,mcp4632-103", MCP463x_103),
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MCP4531_COMPATIBLE("microchip,mcp4632-503", MCP463x_503),
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MCP4531_COMPATIBLE("microchip,mcp4632-104", MCP463x_104),
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MCP4531_COMPATIBLE("microchip,mcp4641-502", MCP464x_502),
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MCP4531_COMPATIBLE("microchip,mcp4641-103", MCP464x_103),
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MCP4531_COMPATIBLE("microchip,mcp4641-503", MCP464x_503),
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MCP4531_COMPATIBLE("microchip,mcp4641-104", MCP464x_104),
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MCP4531_COMPATIBLE("microchip,mcp4642-502", MCP464x_502),
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MCP4531_COMPATIBLE("microchip,mcp4642-103", MCP464x_103),
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MCP4531_COMPATIBLE("microchip,mcp4642-503", MCP464x_503),
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MCP4531_COMPATIBLE("microchip,mcp4642-104", MCP464x_104),
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MCP4531_COMPATIBLE("microchip,mcp4651-502", MCP465x_502),
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MCP4531_COMPATIBLE("microchip,mcp4651-103", MCP465x_103),
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MCP4531_COMPATIBLE("microchip,mcp4651-503", MCP465x_503),
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MCP4531_COMPATIBLE("microchip,mcp4651-104", MCP465x_104),
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MCP4531_COMPATIBLE("microchip,mcp4652-502", MCP465x_502),
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MCP4531_COMPATIBLE("microchip,mcp4652-103", MCP465x_103),
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MCP4531_COMPATIBLE("microchip,mcp4652-503", MCP465x_503),
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MCP4531_COMPATIBLE("microchip,mcp4652-104", MCP465x_104),
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MCP4531_COMPATIBLE("microchip,mcp4661-502", MCP466x_502),
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MCP4531_COMPATIBLE("microchip,mcp4661-103", MCP466x_103),
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MCP4531_COMPATIBLE("microchip,mcp4661-503", MCP466x_503),
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MCP4531_COMPATIBLE("microchip,mcp4661-104", MCP466x_104),
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MCP4531_COMPATIBLE("microchip,mcp4662-502", MCP466x_502),
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MCP4531_COMPATIBLE("microchip,mcp4662-103", MCP466x_103),
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MCP4531_COMPATIBLE("microchip,mcp4662-503", MCP466x_503),
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MCP4531_COMPATIBLE("microchip,mcp4662-104", MCP466x_104),
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mcp4531_of_match);
|
|
#endif
|
|
|
|
static int mcp4531_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct mcp4531_data *data;
|
|
struct iio_dev *indio_dev;
|
|
const struct of_device_id *match;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_WORD_DATA)) {
|
|
dev_err(dev, "SMBUS Word Data not supported\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
data = iio_priv(indio_dev);
|
|
i2c_set_clientdata(client, indio_dev);
|
|
data->client = client;
|
|
|
|
match = of_match_device(of_match_ptr(mcp4531_of_match), dev);
|
|
if (match)
|
|
data->cfg = of_device_get_match_data(dev);
|
|
else
|
|
data->cfg = &mcp4531_cfg[i2c_match_id(mcp4531_id, client)->driver_data];
|
|
|
|
indio_dev->dev.parent = dev;
|
|
indio_dev->info = &mcp4531_info;
|
|
indio_dev->channels = mcp4531_channels;
|
|
indio_dev->num_channels = data->cfg->wipers;
|
|
indio_dev->name = client->name;
|
|
|
|
return devm_iio_device_register(dev, indio_dev);
|
|
}
|
|
|
|
static struct i2c_driver mcp4531_driver = {
|
|
.driver = {
|
|
.name = "mcp4531",
|
|
.of_match_table = of_match_ptr(mcp4531_of_match),
|
|
},
|
|
.probe_new = mcp4531_probe,
|
|
.id_table = mcp4531_id,
|
|
};
|
|
|
|
module_i2c_driver(mcp4531_driver);
|
|
|
|
MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
|
|
MODULE_DESCRIPTION("MCP4531 digital potentiometer");
|
|
MODULE_LICENSE("GPL");
|