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alistair23-linux/drivers/iio/potentiometer/mcp4531.c
Javier Martinez Canillas 9c6e4efded iio: potentiometer: mcp4531: Export OF device ID table as module aliases 
The I2C core always reports a MODALIAS of the form i2c:<foo> even if the
device was registered via OF, this means that exporting the OF device ID
table device aliases in the module is not needed. But in order to change
how the core reports modaliases to user-space, it's better to export it.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2017-01-22 13:21:29 +00:00

409 lines
14 KiB
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/*
* Industrial I/O driver for Microchip digital potentiometers
* Copyright (c) 2015 Axentia Technologies AB
* Author: Peter Rosin <peda@axentia.se>
*
* Datasheet: http://www.microchip.com/downloads/en/DeviceDoc/22096b.pdf
*
* DEVID #Wipers #Positions Resistor Opts (kOhm) i2c address
* mcp4531 1 129 5, 10, 50, 100 010111x
* mcp4532 1 129 5, 10, 50, 100 01011xx
* mcp4541 1 129 5, 10, 50, 100 010111x
* mcp4542 1 129 5, 10, 50, 100 01011xx
* mcp4551 1 257 5, 10, 50, 100 010111x
* mcp4552 1 257 5, 10, 50, 100 01011xx
* mcp4561 1 257 5, 10, 50, 100 010111x
* mcp4562 1 257 5, 10, 50, 100 01011xx
* mcp4631 2 129 5, 10, 50, 100 0101xxx
* mcp4632 2 129 5, 10, 50, 100 01011xx
* mcp4641 2 129 5, 10, 50, 100 0101xxx
* mcp4642 2 129 5, 10, 50, 100 01011xx
* mcp4651 2 257 5, 10, 50, 100 0101xxx
* mcp4652 2 257 5, 10, 50, 100 01011xx
* mcp4661 2 257 5, 10, 50, 100 0101xxx
* mcp4662 2 257 5, 10, 50, 100 01011xx
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/iio/iio.h>
struct mcp4531_cfg {
int wipers;
int avail[3];
int kohms;
};
enum mcp4531_type {
MCP453x_502,
MCP453x_103,
MCP453x_503,
MCP453x_104,
MCP454x_502,
MCP454x_103,
MCP454x_503,
MCP454x_104,
MCP455x_502,
MCP455x_103,
MCP455x_503,
MCP455x_104,
MCP456x_502,
MCP456x_103,
MCP456x_503,
MCP456x_104,
MCP463x_502,
MCP463x_103,
MCP463x_503,
MCP463x_104,
MCP464x_502,
MCP464x_103,
MCP464x_503,
MCP464x_104,
MCP465x_502,
MCP465x_103,
MCP465x_503,
MCP465x_104,
MCP466x_502,
MCP466x_103,
MCP466x_503,
MCP466x_104,
};
static const struct mcp4531_cfg mcp4531_cfg[] = {
[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)
#define MCP4531_INCR (1 << 2)
#define MCP4531_DECR (2 << 2)
#define MCP4531_READ (3 << 2)
#define MCP4531_WIPER_SHIFT (4)
struct mcp4531_data {
struct i2c_client *client;
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), \
.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_RAW), \
}
static const struct iio_chan_spec mcp4531_channels[] = {
MCP4531_CHANNEL(0),
MCP4531_CHANNEL(1),
};
static int mcp4531_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct mcp4531_data *data = iio_priv(indio_dev);
int address = chan->channel << MCP4531_WIPER_SHIFT;
s32 ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = i2c_smbus_read_word_swapped(data->client,
MCP4531_READ | address);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 1000 * data->cfg->kohms;
*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)
{
struct mcp4531_data *data = iio_priv(indio_dev);
int address = chan->channel << MCP4531_WIPER_SHIFT;
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (val > data->cfg->avail[2] || val < 0)
return -EINVAL;
break;
default:
return -EINVAL;
}
return i2c_smbus_write_byte_data(data->client,
MCP4531_WRITE | address | (val >> 8),
val & 0xff);
}
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,
};
#ifdef CONFIG_OF
#define MCP4531_COMPATIBLE(of_compatible, cfg) { \
.compatible = of_compatible, \
.data = &mcp4531_cfg[cfg], \
}
static const struct of_device_id mcp4531_of_match[] = {
MCP4531_COMPATIBLE("microchip,mcp4531-502", MCP453x_502),
MCP4531_COMPATIBLE("microchip,mcp4531-103", MCP453x_103),
MCP4531_COMPATIBLE("microchip,mcp4531-503", MCP453x_503),
MCP4531_COMPATIBLE("microchip,mcp4531-104", MCP453x_104),
MCP4531_COMPATIBLE("microchip,mcp4532-502", MCP453x_502),
MCP4531_COMPATIBLE("microchip,mcp4532-103", MCP453x_103),
MCP4531_COMPATIBLE("microchip,mcp4532-503", MCP453x_503),
MCP4531_COMPATIBLE("microchip,mcp4532-104", MCP453x_104),
MCP4531_COMPATIBLE("microchip,mcp4541-502", MCP454x_502),
MCP4531_COMPATIBLE("microchip,mcp4541-103", MCP454x_103),
MCP4531_COMPATIBLE("microchip,mcp4541-503", MCP454x_503),
MCP4531_COMPATIBLE("microchip,mcp4541-104", MCP454x_104),
MCP4531_COMPATIBLE("microchip,mcp4542-502", MCP454x_502),
MCP4531_COMPATIBLE("microchip,mcp4542-103", MCP454x_103),
MCP4531_COMPATIBLE("microchip,mcp4542-503", MCP454x_503),
MCP4531_COMPATIBLE("microchip,mcp4542-104", MCP454x_104),
MCP4531_COMPATIBLE("microchip,mcp4551-502", MCP455x_502),
MCP4531_COMPATIBLE("microchip,mcp4551-103", MCP455x_103),
MCP4531_COMPATIBLE("microchip,mcp4551-503", MCP455x_503),
MCP4531_COMPATIBLE("microchip,mcp4551-104", MCP455x_104),
MCP4531_COMPATIBLE("microchip,mcp4552-502", MCP455x_502),
MCP4531_COMPATIBLE("microchip,mcp4552-103", MCP455x_103),
MCP4531_COMPATIBLE("microchip,mcp4552-503", MCP455x_503),
MCP4531_COMPATIBLE("microchip,mcp4552-104", MCP455x_104),
MCP4531_COMPATIBLE("microchip,mcp4561-502", MCP456x_502),
MCP4531_COMPATIBLE("microchip,mcp4561-103", MCP456x_103),
MCP4531_COMPATIBLE("microchip,mcp4561-503", MCP456x_503),
MCP4531_COMPATIBLE("microchip,mcp4561-104", MCP456x_104),
MCP4531_COMPATIBLE("microchip,mcp4562-502", MCP456x_502),
MCP4531_COMPATIBLE("microchip,mcp4562-103", MCP456x_103),
MCP4531_COMPATIBLE("microchip,mcp4562-503", MCP456x_503),
MCP4531_COMPATIBLE("microchip,mcp4562-104", MCP456x_104),
MCP4531_COMPATIBLE("microchip,mcp4631-502", MCP463x_502),
MCP4531_COMPATIBLE("microchip,mcp4631-103", MCP463x_103),
MCP4531_COMPATIBLE("microchip,mcp4631-503", MCP463x_503),
MCP4531_COMPATIBLE("microchip,mcp4631-104", MCP463x_104),
MCP4531_COMPATIBLE("microchip,mcp4632-502", MCP463x_502),
MCP4531_COMPATIBLE("microchip,mcp4632-103", MCP463x_103),
MCP4531_COMPATIBLE("microchip,mcp4632-503", MCP463x_503),
MCP4531_COMPATIBLE("microchip,mcp4632-104", MCP463x_104),
MCP4531_COMPATIBLE("microchip,mcp4641-502", MCP464x_502),
MCP4531_COMPATIBLE("microchip,mcp4641-103", MCP464x_103),
MCP4531_COMPATIBLE("microchip,mcp4641-503", MCP464x_503),
MCP4531_COMPATIBLE("microchip,mcp4641-104", MCP464x_104),
MCP4531_COMPATIBLE("microchip,mcp4642-502", MCP464x_502),
MCP4531_COMPATIBLE("microchip,mcp4642-103", MCP464x_103),
MCP4531_COMPATIBLE("microchip,mcp4642-503", MCP464x_503),
MCP4531_COMPATIBLE("microchip,mcp4642-104", MCP464x_104),
MCP4531_COMPATIBLE("microchip,mcp4651-502", MCP465x_502),
MCP4531_COMPATIBLE("microchip,mcp4651-103", MCP465x_103),
MCP4531_COMPATIBLE("microchip,mcp4651-503", MCP465x_503),
MCP4531_COMPATIBLE("microchip,mcp4651-104", MCP465x_104),
MCP4531_COMPATIBLE("microchip,mcp4652-502", MCP465x_502),
MCP4531_COMPATIBLE("microchip,mcp4652-103", MCP465x_103),
MCP4531_COMPATIBLE("microchip,mcp4652-503", MCP465x_503),
MCP4531_COMPATIBLE("microchip,mcp4652-104", MCP465x_104),
MCP4531_COMPATIBLE("microchip,mcp4661-502", MCP466x_502),
MCP4531_COMPATIBLE("microchip,mcp4661-103", MCP466x_103),
MCP4531_COMPATIBLE("microchip,mcp4661-503", MCP466x_503),
MCP4531_COMPATIBLE("microchip,mcp4661-104", MCP466x_104),
MCP4531_COMPATIBLE("microchip,mcp4662-502", MCP466x_502),
MCP4531_COMPATIBLE("microchip,mcp4662-103", MCP466x_103),
MCP4531_COMPATIBLE("microchip,mcp4662-503", MCP466x_503),
MCP4531_COMPATIBLE("microchip,mcp4662-104", MCP466x_104),
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mcp4531_of_match);
#endif
static int mcp4531_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
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[id->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 const struct i2c_device_id mcp4531_id[] = {
{ "mcp4531-502", MCP453x_502 },
{ "mcp4531-103", MCP453x_103 },
{ "mcp4531-503", MCP453x_503 },
{ "mcp4531-104", MCP453x_104 },
{ "mcp4532-502", MCP453x_502 },
{ "mcp4532-103", MCP453x_103 },
{ "mcp4532-503", MCP453x_503 },
{ "mcp4532-104", MCP453x_104 },
{ "mcp4541-502", MCP454x_502 },
{ "mcp4541-103", MCP454x_103 },
{ "mcp4541-503", MCP454x_503 },
{ "mcp4541-104", MCP454x_104 },
{ "mcp4542-502", MCP454x_502 },
{ "mcp4542-103", MCP454x_103 },
{ "mcp4542-503", MCP454x_503 },
{ "mcp4542-104", MCP454x_104 },
{ "mcp4551-502", MCP455x_502 },
{ "mcp4551-103", MCP455x_103 },
{ "mcp4551-503", MCP455x_503 },
{ "mcp4551-104", MCP455x_104 },
{ "mcp4552-502", MCP455x_502 },
{ "mcp4552-103", MCP455x_103 },
{ "mcp4552-503", MCP455x_503 },
{ "mcp4552-104", MCP455x_104 },
{ "mcp4561-502", MCP456x_502 },
{ "mcp4561-103", MCP456x_103 },
{ "mcp4561-503", MCP456x_503 },
{ "mcp4561-104", MCP456x_104 },
{ "mcp4562-502", MCP456x_502 },
{ "mcp4562-103", MCP456x_103 },
{ "mcp4562-503", MCP456x_503 },
{ "mcp4562-104", MCP456x_104 },
{ "mcp4631-502", MCP463x_502 },
{ "mcp4631-103", MCP463x_103 },
{ "mcp4631-503", MCP463x_503 },
{ "mcp4631-104", MCP463x_104 },
{ "mcp4632-502", MCP463x_502 },
{ "mcp4632-103", MCP463x_103 },
{ "mcp4632-503", MCP463x_503 },
{ "mcp4632-104", MCP463x_104 },
{ "mcp4641-502", MCP464x_502 },
{ "mcp4641-103", MCP464x_103 },
{ "mcp4641-503", MCP464x_503 },
{ "mcp4641-104", MCP464x_104 },
{ "mcp4642-502", MCP464x_502 },
{ "mcp4642-103", MCP464x_103 },
{ "mcp4642-503", MCP464x_503 },
{ "mcp4642-104", MCP464x_104 },
{ "mcp4651-502", MCP465x_502 },
{ "mcp4651-103", MCP465x_103 },
{ "mcp4651-503", MCP465x_503 },
{ "mcp4651-104", MCP465x_104 },
{ "mcp4652-502", MCP465x_502 },
{ "mcp4652-103", MCP465x_103 },
{ "mcp4652-503", MCP465x_503 },
{ "mcp4652-104", MCP465x_104 },
{ "mcp4661-502", MCP466x_502 },
{ "mcp4661-103", MCP466x_103 },
{ "mcp4661-503", MCP466x_503 },
{ "mcp4661-104", MCP466x_104 },
{ "mcp4662-502", MCP466x_502 },
{ "mcp4662-103", MCP466x_103 },
{ "mcp4662-503", MCP466x_503 },
{ "mcp4662-104", MCP466x_104 },
{}
};
MODULE_DEVICE_TABLE(i2c, mcp4531_id);
static struct i2c_driver mcp4531_driver = {
.driver = {
.name = "mcp4531",
.of_match_table = of_match_ptr(mcp4531_of_match),
},
.probe = 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");
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