On 22/02/16 01:32, Matt Ranostay wrote:
> Add support for the TI family of digital potentiometers.
>
> Signed-off-by: Matt Ranostay <mranostay@xxxxxxxxx>
Applied to the togreg branch of iio.git - initially pushed out as testing
for the autobuilders to play with it.
Thanks,
Jonathan
> ---
> Changes from v1:
> * Re-order alphabetically chipids
> * Removed unneeded local variable, and mask checks
> * Use return code from regmap_read()
> * Switched to devm_iio_device_register()
>
> drivers/iio/potentiometer/Kconfig | 12 +++
> drivers/iio/potentiometer/Makefile | 1 +
> drivers/iio/potentiometer/tpl0102.c | 166 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 179 insertions(+)
> create mode 100644 drivers/iio/potentiometer/tpl0102.c
>
> diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig
> index fd75db7..ffc735c 100644
> --- a/drivers/iio/potentiometer/Kconfig
> +++ b/drivers/iio/potentiometer/Kconfig
> @@ -17,4 +17,16 @@ config MCP4531
> To compile this driver as a module, choose M here: the
> module will be called mcp4531.
>
> +config TPL0102
> + tristate "Texas Instruments digital potentiometer driver"
> + depends on I2C
> + select REGMAP_I2C
> + help
> + Say yes here to build support for the Texas Instruments
> + TPL0102, TPL0402
> + digital potentiometer chips.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called tpl0102.
> +
> endmenu
> diff --git a/drivers/iio/potentiometer/Makefile b/drivers/iio/potentiometer/Makefile
> index 8afe492..b563b49 100644
> --- a/drivers/iio/potentiometer/Makefile
> +++ b/drivers/iio/potentiometer/Makefile
> @@ -4,3 +4,4 @@
>
> # When adding new entries keep the list in alphabetical order
> obj-$(CONFIG_MCP4531) += mcp4531.o
> +obj-$(CONFIG_TPL0102) += tpl0102.o
> diff --git a/drivers/iio/potentiometer/tpl0102.c b/drivers/iio/potentiometer/tpl0102.c
> new file mode 100644
> index 0000000..313124b
> --- /dev/null
> +++ b/drivers/iio/potentiometer/tpl0102.c
> @@ -0,0 +1,166 @@
> +/*
> + * tpl0102.c - Support for Texas Instruments digital potentiometers
> + *
> + * Copyright (C) 2016 Matt Ranostay <mranostay@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * TODO: enable/disable hi-z output control
> + */
> +
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/iio/iio.h>
> +
> +struct tpl0102_cfg {
> + int wipers;
> + int max_pos;
> + int kohms;
> +};
> +
> +enum tpl0102_type {
> + CAT5140_503,
> + CAT5140_104,
> + TPL0102_104,
> + TPL0401_103,
> +};
> +
> +static const struct tpl0102_cfg tpl0102_cfg[] = {
> + /* on-semiconductor parts */
> + [CAT5140_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
> + [CAT5140_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
> + /* ti parts */
> + [TPL0102_104] = { .wipers = 2, .max_pos = 256, .kohms = 100 },
> + [TPL0401_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
> +};
> +
> +struct tpl0102_data {
> + struct regmap *regmap;
> + unsigned long devid;
> +};
> +
> +static const struct regmap_config tpl0102_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> +};
> +
> +#define TPL0102_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), \
> +}
> +
> +static const struct iio_chan_spec tpl0102_channels[] = {
> + TPL0102_CHANNEL(0),
> + TPL0102_CHANNEL(1),
> +};
> +
> +static int tpl0102_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct tpl0102_data *data = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW: {
> + int ret = regmap_read(data->regmap, chan->channel, val);
> +
> + return ret ? ret : IIO_VAL_INT;
> + }
> + case IIO_CHAN_INFO_SCALE:
> + *val = 1000 * tpl0102_cfg[data->devid].kohms;
> + *val2 = tpl0102_cfg[data->devid].max_pos;
> + return IIO_VAL_FRACTIONAL;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int tpl0102_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct tpl0102_data *data = iio_priv(indio_dev);
> +
> + if (mask != IIO_CHAN_INFO_RAW)
> + return -EINVAL;
> +
> + if (val >= tpl0102_cfg[data->devid].max_pos || val < 0)
> + return -EINVAL;
> +
> + return regmap_write(data->regmap, chan->channel, val);
> +}
> +
> +static const struct iio_info tpl0102_info = {
> + .read_raw = tpl0102_read_raw,
> + .write_raw = tpl0102_write_raw,
> + .driver_module = THIS_MODULE,
> +};
> +
> +static int tpl0102_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct device *dev = &client->dev;
> + struct tpl0102_data *data;
> + struct iio_dev *indio_dev;
> +
> + if (!i2c_check_functionality(client->adapter,
> + I2C_FUNC_SMBUS_WORD_DATA))
> + return -ENOTSUPP;
> +
> + 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->devid = id->driver_data;
> + data->regmap = devm_regmap_init_i2c(client, &tpl0102_regmap_config);
> + if (IS_ERR(data->regmap)) {
> + dev_err(dev, "regmap initialization failed\n");
> + return PTR_ERR(data->regmap);
> + }
> +
> + indio_dev->dev.parent = dev;
> + indio_dev->info = &tpl0102_info;
> + indio_dev->channels = tpl0102_channels;
> + indio_dev->num_channels = tpl0102_cfg[data->devid].wipers;
> + indio_dev->name = client->name;
> +
> + return devm_iio_device_register(dev, indio_dev);
> +}
> +
> +static const struct i2c_device_id tpl0102_id[] = {
> + { "cat5140-503", CAT5140_503 },
> + { "cat5140-104", CAT5140_104 },
> + { "tpl0102-104", TPL0102_104 },
> + { "tpl0401-103", TPL0401_103 },
> + {}
> +};
> +MODULE_DEVICE_TABLE(i2c, tpl0102_id);
> +
> +static struct i2c_driver tpl0102_driver = {
> + .driver = {
> + .name = "tpl0102",
> + },
> + .probe = tpl0102_probe,
> + .id_table = tpl0102_id,
> +};
> +
> +module_i2c_driver(tpl0102_driver);
> +
> +MODULE_AUTHOR("Matt Ranostay <mranostay@xxxxxxxxx>");
> +MODULE_DESCRIPTION("TPL0102 digital potentiometer");
> +MODULE_LICENSE("GPL");
>
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