iio: dac: ds4422/ds4424 dac driver
This patch provides an iio device driver for DS4422/DS4424 chips that support two/four channel 7-bit Sink/Source Current DAC. Signed-off-by: Ismail H. Kose <Ismail.Kose@maximintegrated.com> Signed-off-by: Ismail H. Kose <ihkose@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Ismail H. Kose
Jonathan Cameron
parent
b091b9ed1b
commit
d632a2bd8f
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@ -222,6 +222,15 @@ config DPOT_DAC
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To compile this driver as a module, choose M here: the module will be
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called dpot-dac.
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config DS4424
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tristate "Maxim Integrated DS4422/DS4424 DAC driver"
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depends on I2C
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help
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If you say yes here you get support for Maxim chips DS4422, DS4424.
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This driver can also be built as a module. If so, the module
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will be called ds4424.
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config LPC18XX_DAC
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tristate "NXP LPC18xx DAC driver"
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depends on ARCH_LPC18XX || COMPILE_TEST
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@ -23,6 +23,7 @@ obj-$(CONFIG_AD7303) += ad7303.o
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obj-$(CONFIG_AD8801) += ad8801.o
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obj-$(CONFIG_CIO_DAC) += cio-dac.o
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obj-$(CONFIG_DPOT_DAC) += dpot-dac.o
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obj-$(CONFIG_DS4424) += ds4424.o
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obj-$(CONFIG_LPC18XX_DAC) += lpc18xx_dac.o
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obj-$(CONFIG_LTC2632) += ltc2632.o
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obj-$(CONFIG_M62332) += m62332.o
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@ -0,0 +1,341 @@
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/*
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* Maxim Integrated
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* 7-bit, Multi-Channel Sink/Source Current DAC Driver
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* Copyright (C) 2017 Maxim Integrated
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/regulator/consumer.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/driver.h>
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#include <linux/iio/machine.h>
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#include <linux/iio/consumer.h>
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#define DS4422_MAX_DAC_CHANNELS 2
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#define DS4424_MAX_DAC_CHANNELS 4
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#define DS4424_DAC_ADDR(chan) ((chan) + 0xf8)
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#define DS4424_SOURCE_I 1
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#define DS4424_SINK_I 0
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#define DS4424_CHANNEL(chan) { \
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.type = IIO_CURRENT, \
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.indexed = 1, \
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.output = 1, \
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.channel = chan, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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}
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/*
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* DS4424 DAC control register 8 bits
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* [7] 0: to sink; 1: to source
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* [6:0] steps to sink/source
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* bit[7] looks like a sign bit, but the value of the register is
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* not a two's complement code considering the bit[6:0] is a absolute
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* distance from the zero point.
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*/
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union ds4424_raw_data {
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struct {
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u8 dx:7;
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u8 source_bit:1;
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};
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u8 bits;
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};
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enum ds4424_device_ids {
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ID_DS4422,
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ID_DS4424,
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};
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struct ds4424_data {
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struct i2c_client *client;
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struct mutex lock;
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uint8_t save[DS4424_MAX_DAC_CHANNELS];
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struct regulator *vcc_reg;
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uint8_t raw[DS4424_MAX_DAC_CHANNELS];
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};
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static const struct iio_chan_spec ds4424_channels[] = {
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DS4424_CHANNEL(0),
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DS4424_CHANNEL(1),
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DS4424_CHANNEL(2),
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DS4424_CHANNEL(3),
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};
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static int ds4424_get_value(struct iio_dev *indio_dev,
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int *val, int channel)
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{
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struct ds4424_data *data = iio_priv(indio_dev);
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int ret;
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mutex_lock(&data->lock);
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ret = i2c_smbus_read_byte_data(data->client, DS4424_DAC_ADDR(channel));
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if (ret < 0)
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goto fail;
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*val = ret;
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fail:
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mutex_unlock(&data->lock);
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return ret;
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}
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static int ds4424_set_value(struct iio_dev *indio_dev,
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int val, struct iio_chan_spec const *chan)
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{
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struct ds4424_data *data = iio_priv(indio_dev);
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int ret;
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mutex_lock(&data->lock);
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ret = i2c_smbus_write_byte_data(data->client,
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DS4424_DAC_ADDR(chan->channel), val);
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if (ret < 0)
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goto fail;
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data->raw[chan->channel] = val;
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fail:
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mutex_unlock(&data->lock);
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return ret;
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}
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static int ds4424_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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union ds4424_raw_data raw;
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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 = ds4424_get_value(indio_dev, val, chan->channel);
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if (ret < 0) {
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pr_err("%s : ds4424_get_value returned %d\n",
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__func__, ret);
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return ret;
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}
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raw.bits = *val;
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*val = raw.dx;
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if (raw.source_bit == DS4424_SINK_I)
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*val = -*val;
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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 ds4424_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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union ds4424_raw_data raw;
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if (val2 != 0)
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return -EINVAL;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (val < S8_MIN || val > S8_MAX)
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return -EINVAL;
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if (val > 0) {
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raw.source_bit = DS4424_SOURCE_I;
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raw.dx = val;
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} else {
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raw.source_bit = DS4424_SINK_I;
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raw.dx = -val;
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}
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return ds4424_set_value(indio_dev, raw.bits, chan);
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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 ds4424_verify_chip(struct iio_dev *indio_dev)
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{
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int ret, val;
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ret = ds4424_get_value(indio_dev, &val, DS4424_DAC_ADDR(0));
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if (ret < 0)
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dev_err(&indio_dev->dev,
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"%s failed. ret: %d\n", __func__, ret);
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return ret;
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}
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static int __maybe_unused ds4424_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct ds4424_data *data = iio_priv(indio_dev);
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int ret = 0;
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int i;
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for (i = 0; i < indio_dev->num_channels; i++) {
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data->save[i] = data->raw[i];
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ret = ds4424_set_value(indio_dev, 0,
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&indio_dev->channels[i]);
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if (ret < 0)
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return ret;
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}
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return ret;
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}
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static int __maybe_unused ds4424_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct ds4424_data *data = iio_priv(indio_dev);
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int ret = 0;
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int i;
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for (i = 0; i < indio_dev->num_channels; i++) {
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ret = ds4424_set_value(indio_dev, data->save[i],
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&indio_dev->channels[i]);
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if (ret < 0)
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return ret;
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}
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return ret;
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}
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static SIMPLE_DEV_PM_OPS(ds4424_pm_ops, ds4424_suspend, ds4424_resume);
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static const struct iio_info ds4424_info = {
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.read_raw = ds4424_read_raw,
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.write_raw = ds4424_write_raw,
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};
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static int ds4424_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct ds4424_data *data;
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struct iio_dev *indio_dev;
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int ret;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev) {
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dev_err(&client->dev, "iio dev alloc failed.\n");
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return -ENOMEM;
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}
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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indio_dev->name = id->name;
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indio_dev->dev.of_node = client->dev.of_node;
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indio_dev->dev.parent = &client->dev;
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if (!client->dev.of_node) {
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dev_err(&client->dev,
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"Not found DT.\n");
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return -ENODEV;
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}
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data->vcc_reg = devm_regulator_get(&client->dev, "vcc");
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if (IS_ERR(data->vcc_reg)) {
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dev_err(&client->dev,
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"Failed to get vcc-supply regulator. err: %ld\n",
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PTR_ERR(data->vcc_reg));
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return PTR_ERR(data->vcc_reg);
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}
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mutex_init(&data->lock);
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ret = regulator_enable(data->vcc_reg);
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if (ret < 0) {
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dev_err(&client->dev,
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"Unable to enable the regulator.\n");
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return ret;
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}
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usleep_range(1000, 1200);
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ret = ds4424_verify_chip(indio_dev);
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if (ret < 0)
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goto fail;
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switch (id->driver_data) {
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case ID_DS4422:
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indio_dev->num_channels = DS4422_MAX_DAC_CHANNELS;
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break;
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case ID_DS4424:
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indio_dev->num_channels = DS4424_MAX_DAC_CHANNELS;
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break;
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default:
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dev_err(&client->dev,
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"ds4424: Invalid chip id.\n");
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ret = -ENXIO;
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goto fail;
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}
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indio_dev->channels = ds4424_channels;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &ds4424_info;
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ret = iio_device_register(indio_dev);
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if (ret < 0) {
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dev_err(&client->dev,
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"iio_device_register failed. ret: %d\n", ret);
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goto fail;
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}
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return ret;
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fail:
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regulator_disable(data->vcc_reg);
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return ret;
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}
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static int ds4424_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct ds4424_data *data = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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regulator_disable(data->vcc_reg);
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return 0;
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}
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static const struct i2c_device_id ds4424_id[] = {
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{ "ds4422", ID_DS4422 },
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{ "ds4424", ID_DS4424 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ds4424_id);
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static const struct of_device_id ds4424_of_match[] = {
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{ .compatible = "maxim,ds4422" },
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{ .compatible = "maxim,ds4424" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ds4424_of_match);
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static struct i2c_driver ds4424_driver = {
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.driver = {
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.name = "ds4424",
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.of_match_table = ds4424_of_match,
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.pm = &ds4424_pm_ops,
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},
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.probe = ds4424_probe,
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.remove = ds4424_remove,
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.id_table = ds4424_id,
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};
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module_i2c_driver(ds4424_driver);
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MODULE_DESCRIPTION("Maxim DS4424 DAC Driver");
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MODULE_AUTHOR("Ismail H. Kose <ismail.kose@maximintegrated.com>");
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MODULE_AUTHOR("Vishal Sood <vishal.sood@maximintegrated.com>");
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MODULE_AUTHOR("David Jung <david.jung@maximintegrated.com>");
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MODULE_LICENSE("GPL v2");
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