^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Maxim Integrated DS1803 digital potentiometer driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2016 Slawomir Stepien
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Datasheet: https://datasheets.maximintegrated.com/en/ds/DS1803.pdf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * DEVID #Wipers #Positions Resistor Opts (kOhm) i2c address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * ds1803 2 256 10, 50, 100 0101xxx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mod_devicetable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define DS1803_MAX_POS 255
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define DS1803_WRITE(chan) (0xa8 | ((chan) + 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) enum ds1803_type {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) DS1803_010,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) DS1803_050,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) DS1803_100,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct ds1803_cfg {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) int kohms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static const struct ds1803_cfg ds1803_cfg[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) [DS1803_010] = { .kohms = 10, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) [DS1803_050] = { .kohms = 50, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) [DS1803_100] = { .kohms = 100, },
^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 ds1803_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) const struct ds1803_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) #define DS1803_CHANNEL(ch) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) .type = IIO_RESISTANCE, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) .indexed = 1, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) .output = 1, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) .channel = (ch), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static const struct iio_chan_spec ds1803_channels[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) DS1803_CHANNEL(0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) DS1803_CHANNEL(1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static int ds1803_read_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) int *val, int *val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct ds1803_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) int pot = chan->channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) u8 result[ARRAY_SIZE(ds1803_channels)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) ret = i2c_master_recv(data->client, result,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) indio_dev->num_channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) *val = result[pot];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) case IIO_CHAN_INFO_SCALE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) *val = 1000 * data->cfg->kohms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) *val2 = DS1803_MAX_POS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return IIO_VAL_FRACTIONAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static int ds1803_write_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int val, int val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct ds1803_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) int pot = chan->channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (val2 != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (val > DS1803_MAX_POS || val < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return i2c_smbus_write_byte_data(data->client, DS1803_WRITE(pot), val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static const struct iio_info ds1803_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) .read_raw = ds1803_read_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) .write_raw = ds1803_write_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int ds1803_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct ds1803_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct iio_dev *indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (!indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) i2c_set_clientdata(client, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) data->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) data->cfg = &ds1803_cfg[id->driver_data];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) indio_dev->info = &ds1803_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) indio_dev->channels = ds1803_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) indio_dev->num_channels = ARRAY_SIZE(ds1803_channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) indio_dev->name = client->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return devm_iio_device_register(dev, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static const struct of_device_id ds1803_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) { .compatible = "maxim,ds1803-010", .data = &ds1803_cfg[DS1803_010] },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) { .compatible = "maxim,ds1803-050", .data = &ds1803_cfg[DS1803_050] },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) { .compatible = "maxim,ds1803-100", .data = &ds1803_cfg[DS1803_100] },
^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) MODULE_DEVICE_TABLE(of, ds1803_dt_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static const struct i2c_device_id ds1803_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) { "ds1803-010", DS1803_010 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) { "ds1803-050", DS1803_050 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) { "ds1803-100", DS1803_100 },
^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) MODULE_DEVICE_TABLE(i2c, ds1803_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static struct i2c_driver ds1803_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) .name = "ds1803",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) .of_match_table = ds1803_dt_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) .probe = ds1803_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) .id_table = ds1803_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) module_i2c_driver(ds1803_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) MODULE_AUTHOR("Slawomir Stepien <sst@poczta.fm>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) MODULE_DESCRIPTION("DS1803 digital potentiometer");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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