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172 lines
4.1 KiB
172 lines
4.1 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* tpl0102.c - Support for Texas Instruments digital potentiometers |
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* |
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* Copyright (C) 2016, 2018 |
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* Author: Matt Ranostay <[email protected]> |
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* |
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* TODO: enable/disable hi-z output control |
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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/regmap.h> |
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#include <linux/iio/iio.h> |
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struct tpl0102_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 tpl0102_type { |
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CAT5140_503, |
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CAT5140_104, |
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TPL0102_104, |
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TPL0401_103, |
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}; |
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static const struct tpl0102_cfg tpl0102_cfg[] = { |
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/* on-semiconductor parts */ |
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[CAT5140_503] = { .wipers = 1, .avail = { 0, 1, 255 }, .kohms = 50, }, |
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[CAT5140_104] = { .wipers = 1, .avail = { 0, 1, 255 }, .kohms = 100, }, |
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/* ti parts */ |
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[TPL0102_104] = { .wipers = 2, .avail = { 0, 1, 255 }, .kohms = 100 }, |
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[TPL0401_103] = { .wipers = 1, .avail = { 0, 1, 127 }, .kohms = 10, }, |
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}; |
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struct tpl0102_data { |
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struct regmap *regmap; |
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const struct tpl0102_cfg *cfg; |
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}; |
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static const struct regmap_config tpl0102_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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}; |
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#define TPL0102_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_separate_available = BIT(IIO_CHAN_INFO_RAW), \ |
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} |
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static const struct iio_chan_spec tpl0102_channels[] = { |
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TPL0102_CHANNEL(0), |
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TPL0102_CHANNEL(1), |
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}; |
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static int tpl0102_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 tpl0102_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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int ret = regmap_read(data->regmap, chan->channel, val); |
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return ret ? ret : IIO_VAL_INT; |
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} |
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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] + 1; |
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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 tpl0102_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 tpl0102_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 tpl0102_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 tpl0102_data *data = iio_priv(indio_dev); |
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if (mask != IIO_CHAN_INFO_RAW) |
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return -EINVAL; |
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if (val > data->cfg->avail[2] || val < 0) |
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return -EINVAL; |
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return regmap_write(data->regmap, chan->channel, val); |
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} |
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static const struct iio_info tpl0102_info = { |
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.read_raw = tpl0102_read_raw, |
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.read_avail = tpl0102_read_avail, |
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.write_raw = tpl0102_write_raw, |
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}; |
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static int tpl0102_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct device *dev = &client->dev; |
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struct tpl0102_data *data; |
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struct iio_dev *indio_dev; |
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indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); |
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if (!indio_dev) |
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return -ENOMEM; |
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data = iio_priv(indio_dev); |
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i2c_set_clientdata(client, indio_dev); |
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data->cfg = &tpl0102_cfg[id->driver_data]; |
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data->regmap = devm_regmap_init_i2c(client, &tpl0102_regmap_config); |
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if (IS_ERR(data->regmap)) { |
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dev_err(dev, "regmap initialization failed\n"); |
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return PTR_ERR(data->regmap); |
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} |
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indio_dev->info = &tpl0102_info; |
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indio_dev->channels = tpl0102_channels; |
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indio_dev->num_channels = data->cfg->wipers; |
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indio_dev->name = client->name; |
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return devm_iio_device_register(dev, indio_dev); |
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} |
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static const struct i2c_device_id tpl0102_id[] = { |
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{ "cat5140-503", CAT5140_503 }, |
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{ "cat5140-104", CAT5140_104 }, |
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{ "tpl0102-104", TPL0102_104 }, |
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{ "tpl0401-103", TPL0401_103 }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, tpl0102_id); |
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static struct i2c_driver tpl0102_driver = { |
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.driver = { |
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.name = "tpl0102", |
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}, |
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.probe = tpl0102_probe, |
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.id_table = tpl0102_id, |
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}; |
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module_i2c_driver(tpl0102_driver); |
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MODULE_AUTHOR("Matt Ranostay <[email protected]>"); |
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MODULE_DESCRIPTION("TPL0102 digital potentiometer"); |
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MODULE_LICENSE("GPL");
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