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iio: potentiometer: Add driver support for AD5110
The AD5110/AD5112/AD5114 provide a nonvolatile solution for 128-/64-/32-position adjustment applications, offering guaranteed low resistor tolerance errors of ±8% and up to ±6 mA current density. Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD5110_5112_5114.pdf Signed-off-by: Mugilraj Dhavachelvan <dmugil2000@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20210814175607.48399-3-dmugil2000@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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@ -459,6 +459,12 @@ S: Maintained
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W: https://parisc.wiki.kernel.org/index.php/AD1889
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F: sound/pci/ad1889.*
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AD5110 ANALOG DEVICES DIGITAL POTENTIOMETERS DRIVER
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M: Mugilraj Dhavachelvan <dmugil2000@gmail.com>
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L: linux-iio@vger.kernel.org
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S: Supported
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F: drivers/iio/potentiometer/ad5110.c
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AD525X ANALOG DEVICES DIGITAL POTENTIOMETERS DRIVER
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M: Michael Hennerich <michael.hennerich@analog.com>
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S: Supported
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@ -6,6 +6,16 @@
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menu "Digital potentiometers"
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config AD5110
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tristate "Analog Devices AD5110 and similar Digital Potentiometer driver"
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depends on I2C
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help
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Say yes here to build support for the Analog Devices AD5110, AD5112
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and AD5114 digital potentiometer chip.
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To compile this driver as a module, choose M here: the
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module will be called ad5110.
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config AD5272
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tristate "Analog Devices AD5272 and similar Digital Potentiometer driver"
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depends on I2C
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@ -4,6 +4,7 @@
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#
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# When adding new entries keep the list in alphabetical order
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obj-$(CONFIG_AD5110) += ad5110.o
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obj-$(CONFIG_AD5272) += ad5272.o
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obj-$(CONFIG_DS1803) += ds1803.o
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obj-$(CONFIG_MAX5432) += max5432.o
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344
drivers/iio/potentiometer/ad5110.c
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344
drivers/iio/potentiometer/ad5110.c
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@ -0,0 +1,344 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Analog Devices AD5110 digital potentiometer driver
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*
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* Copyright (C) 2021 Mugilraj Dhavachelvan <dmugil2000@gmail.com>
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*
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* Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD5110_5112_5114.pdf
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*/
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#include <linux/bitfield.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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/* AD5110 commands */
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#define AD5110_EEPROM_WR 1
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#define AD5110_RDAC_WR 2
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#define AD5110_SHUTDOWN 3
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#define AD5110_RESET 4
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#define AD5110_RDAC_RD 5
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#define AD5110_EEPROM_RD 6
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/* AD5110_EEPROM_RD data */
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#define AD5110_WIPER_POS 0
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#define AD5110_RESISTOR_TOL 1
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#define AD5110_WIPER_RESISTANCE 70
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struct ad5110_cfg {
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int max_pos;
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int kohms;
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int shift;
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};
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enum ad5110_type {
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AD5110_10,
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AD5110_80,
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AD5112_05,
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AD5112_10,
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AD5112_80,
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AD5114_10,
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AD5114_80,
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};
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static const struct ad5110_cfg ad5110_cfg[] = {
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[AD5110_10] = { .max_pos = 128, .kohms = 10 },
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[AD5110_80] = { .max_pos = 128, .kohms = 80 },
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[AD5112_05] = { .max_pos = 64, .kohms = 5, .shift = 1 },
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[AD5112_10] = { .max_pos = 64, .kohms = 10, .shift = 1 },
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[AD5112_80] = { .max_pos = 64, .kohms = 80, .shift = 1 },
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[AD5114_10] = { .max_pos = 32, .kohms = 10, .shift = 2 },
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[AD5114_80] = { .max_pos = 32, .kohms = 80, .shift = 2 },
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};
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struct ad5110_data {
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struct i2c_client *client;
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s16 tol; /* resistor tolerance */
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bool enable;
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struct mutex lock;
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const struct ad5110_cfg *cfg;
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/*
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* DMA (thus cache coherency maintenance) requires the
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* transfer buffers to live in their own cache lines.
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*/
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u8 buf[2] ____cacheline_aligned;
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};
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static const struct iio_chan_spec ad5110_channels[] = {
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{
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.type = IIO_RESISTANCE,
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.output = 1,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_OFFSET) |
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BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_ENABLE),
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},
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};
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static int ad5110_read(struct ad5110_data *data, u8 cmd, int *val)
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{
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int ret;
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mutex_lock(&data->lock);
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data->buf[0] = cmd;
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data->buf[1] = *val;
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ret = i2c_master_send_dmasafe(data->client, data->buf, sizeof(data->buf));
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if (ret < 0) {
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goto error;
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} else if (ret != sizeof(data->buf)) {
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ret = -EIO;
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goto error;
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}
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ret = i2c_master_recv_dmasafe(data->client, data->buf, 1);
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if (ret < 0) {
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goto error;
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} else if (ret != 1) {
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ret = -EIO;
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goto error;
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}
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*val = data->buf[0];
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ret = 0;
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error:
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mutex_unlock(&data->lock);
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return ret;
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}
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static int ad5110_write(struct ad5110_data *data, u8 cmd, u8 val)
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{
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int ret;
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mutex_lock(&data->lock);
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data->buf[0] = cmd;
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data->buf[1] = val;
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ret = i2c_master_send_dmasafe(data->client, data->buf, sizeof(data->buf));
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if (ret < 0) {
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goto error;
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} else if (ret != sizeof(data->buf)) {
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ret = -EIO;
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goto error;
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}
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ret = 0;
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error:
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mutex_unlock(&data->lock);
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return ret;
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}
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static int ad5110_resistor_tol(struct ad5110_data *data, u8 cmd, int val)
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{
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int ret;
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ret = ad5110_read(data, cmd, &val);
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if (ret)
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return ret;
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data->tol = data->cfg->kohms * (val & GENMASK(6, 0)) * 10 / 8;
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if (!(val & BIT(7)))
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data->tol *= -1;
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return 0;
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}
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static ssize_t store_eeprom_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct ad5110_data *data = iio_priv(indio_dev);
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int val = AD5110_WIPER_POS;
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int ret;
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ret = ad5110_read(data, AD5110_EEPROM_RD, &val);
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if (ret)
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return ret;
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val = val >> data->cfg->shift;
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return iio_format_value(buf, IIO_VAL_INT, 1, &val);
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}
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static ssize_t store_eeprom_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct ad5110_data *data = iio_priv(indio_dev);
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int ret;
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ret = ad5110_write(data, AD5110_EEPROM_WR, 0);
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if (ret) {
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dev_err(&data->client->dev, "RDAC to EEPROM write failed\n");
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return ret;
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}
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/* The storing of EEPROM data takes approximately 18 ms. */
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msleep(20);
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return len;
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}
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static IIO_DEVICE_ATTR_RW(store_eeprom, 0);
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static struct attribute *ad5110_attributes[] = {
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&iio_dev_attr_store_eeprom.dev_attr.attr,
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NULL
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};
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static const struct attribute_group ad5110_attribute_group = {
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.attrs = ad5110_attributes,
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};
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static int ad5110_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 ad5110_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = ad5110_read(data, AD5110_RDAC_RD, val);
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if (ret)
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return ret;
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*val = *val >> data->cfg->shift;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_OFFSET:
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*val = AD5110_WIPER_RESISTANCE * data->cfg->max_pos;
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*val2 = 1000 * data->cfg->kohms + data->tol;
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return IIO_VAL_FRACTIONAL;
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case IIO_CHAN_INFO_SCALE:
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*val = 1000 * data->cfg->kohms + data->tol;
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*val2 = data->cfg->max_pos;
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return IIO_VAL_FRACTIONAL;
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case IIO_CHAN_INFO_ENABLE:
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*val = data->enable;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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}
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static int ad5110_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 ad5110_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (val > data->cfg->max_pos || val < 0)
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return -EINVAL;
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return ad5110_write(data, AD5110_RDAC_WR, val << data->cfg->shift);
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case IIO_CHAN_INFO_ENABLE:
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if (val < 0 || val > 1)
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return -EINVAL;
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if (data->enable == val)
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return 0;
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ret = ad5110_write(data, AD5110_SHUTDOWN, val ? 0 : 1);
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if (ret)
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return ret;
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data->enable = val;
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return 0;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info ad5110_info = {
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.read_raw = ad5110_read_raw,
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.write_raw = ad5110_write_raw,
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.attrs = &ad5110_attribute_group,
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};
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#define AD5110_COMPATIBLE(of_compatible, cfg) { \
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.compatible = of_compatible, \
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.data = &ad5110_cfg[cfg], \
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}
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static const struct of_device_id ad5110_of_match[] = {
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AD5110_COMPATIBLE("adi,ad5110-10", AD5110_10),
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AD5110_COMPATIBLE("adi,ad5110-80", AD5110_80),
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AD5110_COMPATIBLE("adi,ad5112-05", AD5112_05),
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AD5110_COMPATIBLE("adi,ad5112-10", AD5112_10),
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AD5110_COMPATIBLE("adi,ad5112-80", AD5112_80),
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AD5110_COMPATIBLE("adi,ad5114-10", AD5114_10),
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AD5110_COMPATIBLE("adi,ad5114-80", AD5114_80),
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{ }
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};
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MODULE_DEVICE_TABLE(of, ad5110_of_match);
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static const struct i2c_device_id ad5110_id[] = {
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{ "ad5110-10", AD5110_10 },
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{ "ad5110-80", AD5110_80 },
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{ "ad5112-05", AD5112_05 },
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{ "ad5112-10", AD5112_10 },
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{ "ad5112-80", AD5112_80 },
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{ "ad5114-10", AD5114_10 },
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{ "ad5114-80", AD5114_80 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ad5110_id);
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static int ad5110_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct iio_dev *indio_dev;
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struct ad5110_data *data;
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int ret;
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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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data->client = client;
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mutex_init(&data->lock);
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data->enable = 1;
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data->cfg = device_get_match_data(dev);
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/* refresh RDAC register with EEPROM */
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ret = ad5110_write(data, AD5110_RESET, 0);
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if (ret) {
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dev_err(dev, "Refresh RDAC with EEPROM failed\n");
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return ret;
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}
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ret = ad5110_resistor_tol(data, AD5110_EEPROM_RD, AD5110_RESISTOR_TOL);
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if (ret) {
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dev_err(dev, "Read resistor tolerance failed\n");
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return ret;
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}
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &ad5110_info;
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indio_dev->channels = ad5110_channels;
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indio_dev->num_channels = ARRAY_SIZE(ad5110_channels);
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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 struct i2c_driver ad5110_driver = {
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.driver = {
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.name = "ad5110",
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.of_match_table = ad5110_of_match,
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},
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.probe_new = ad5110_probe,
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.id_table = ad5110_id,
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};
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module_i2c_driver(ad5110_driver);
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MODULE_AUTHOR("Mugilraj Dhavachelvan <dmugil2000@gmail.com>");
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MODULE_DESCRIPTION("AD5110 digital potentiometer");
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MODULE_LICENSE("GPL v2");
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