mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-20 14:16:02 +00:00
Code Issues Releases Wiki Activity
linux-stable/drivers/iio/potentiometer/mcp4531.c
Jonathan Cameron 20e39f3aa2 iio:potentiometer:mcp4531: Drop of_match_ptr and CONFIG_OF protections. 
These prevent use of this driver with ACPI via PRP0001 and are
an example of an anti pattern I'm trying to remove from IIO.
Hence drop them from this driver.

Also switch to device_get_match_data() from of_ variant and adjust
headers to reflect the change.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Peter Rosin <peda@axentia.se>
Link: https://lore.kernel.org/r/20200910173242.621168-9-jic23@kernel.org
2020-09-21 18:41:27 +01:00

396 lines
14 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* 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
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mod_devicetable.h>
#include <linux/property.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,
};
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);
#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);
static int mcp4531_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct mcp4531_data *data;
struct iio_dev *indio_dev;
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;
data->cfg = device_get_match_data(dev);
if (!data->cfg)
data->cfg = &mcp4531_cfg[i2c_match_id(mcp4531_id, client)->driver_data];
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 = 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 v2");
Reference in a new issue View git blame Copy permalink