^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * tpl0102.c - Support for Texas Instruments digital potentiometers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2016, 2018
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Matt Ranostay <matt.ranostay@konsulko.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * TODO: enable/disable hi-z output control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct tpl0102_cfg {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) int wipers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) int avail[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) int kohms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) enum tpl0102_type {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) CAT5140_503,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) CAT5140_104,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) TPL0102_104,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) TPL0401_103,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static const struct tpl0102_cfg tpl0102_cfg[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /* on-semiconductor parts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) [CAT5140_503] = { .wipers = 1, .avail = { 0, 1, 255 }, .kohms = 50, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) [CAT5140_104] = { .wipers = 1, .avail = { 0, 1, 255 }, .kohms = 100, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) /* ti parts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) [TPL0102_104] = { .wipers = 2, .avail = { 0, 1, 255 }, .kohms = 100 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) [TPL0401_103] = { .wipers = 1, .avail = { 0, 1, 127 }, .kohms = 10, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct tpl0102_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) const struct tpl0102_cfg *cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static const struct regmap_config tpl0102_regmap_config = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) .reg_bits = 8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) .val_bits = 8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define TPL0102_CHANNEL(ch) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) .type = IIO_RESISTANCE, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) .indexed = 1, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) .output = 1, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) .channel = (ch), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) .info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static const struct iio_chan_spec tpl0102_channels[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) TPL0102_CHANNEL(0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) TPL0102_CHANNEL(1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static int tpl0102_read_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) int *val, int *val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct tpl0102_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) case IIO_CHAN_INFO_RAW: {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) int ret = regmap_read(data->regmap, chan->channel, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return ret ? ret : IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) case IIO_CHAN_INFO_SCALE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) *val = 1000 * data->cfg->kohms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) *val2 = data->cfg->avail[2] + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return IIO_VAL_FRACTIONAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static int tpl0102_read_avail(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) const int **vals, int *type, int *length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct tpl0102_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) *length = ARRAY_SIZE(data->cfg->avail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) *vals = data->cfg->avail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) *type = IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return IIO_AVAIL_RANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static int tpl0102_write_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) int val, int val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) struct tpl0102_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (mask != IIO_CHAN_INFO_RAW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (val > data->cfg->avail[2] || val < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return regmap_write(data->regmap, chan->channel, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static const struct iio_info tpl0102_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) .read_raw = tpl0102_read_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) .read_avail = tpl0102_read_avail,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) .write_raw = tpl0102_write_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static int tpl0102_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct tpl0102_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct iio_dev *indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (!indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) i2c_set_clientdata(client, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) data->cfg = &tpl0102_cfg[id->driver_data];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) data->regmap = devm_regmap_init_i2c(client, &tpl0102_regmap_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (IS_ERR(data->regmap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) dev_err(dev, "regmap initialization failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return PTR_ERR(data->regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) indio_dev->info = &tpl0102_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) indio_dev->channels = tpl0102_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) indio_dev->num_channels = data->cfg->wipers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) indio_dev->name = client->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return devm_iio_device_register(dev, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static const struct i2c_device_id tpl0102_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) { "cat5140-503", CAT5140_503 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) { "cat5140-104", CAT5140_104 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) { "tpl0102-104", TPL0102_104 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) { "tpl0401-103", TPL0401_103 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) MODULE_DEVICE_TABLE(i2c, tpl0102_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static struct i2c_driver tpl0102_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .name = "tpl0102",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) .probe = tpl0102_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) .id_table = tpl0102_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) module_i2c_driver(tpl0102_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) MODULE_DESCRIPTION("TPL0102 digital potentiometer");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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