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iio: add m62332 DAC driver
m62332 is a simple 2-channel DAC used on several Sharp Zaurus boards to control LCD voltage, backlight and sound. The driver use regulators to control the reference voltage and enabling/disabling the DAC. Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Dmitry Eremin-Solenikov
Jonathan Cameron
parent
c06cee8d08
commit
b87b0c0f81
@ -142,6 +142,16 @@ config AD7303
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To compile this driver as module choose M here: the module will be called
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ad7303.
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config M62332
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tristate "Mitsubishi M62332 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 the Mitsubishi M62332
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(I2C 8-Bit DACs with rail-to-rail outputs).
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This driver can also be built as a module. If so, the module
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will be called m62332.
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config MAX517
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tristate "Maxim MAX517/518/519/520/521 DAC driver"
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depends on I2C
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@ -16,6 +16,7 @@ obj-$(CONFIG_AD5764) += ad5764.o
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obj-$(CONFIG_AD5791) += ad5791.o
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obj-$(CONFIG_AD5686) += ad5686.o
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obj-$(CONFIG_AD7303) += ad7303.o
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obj-$(CONFIG_M62332) += m62332.o
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obj-$(CONFIG_MAX517) += max517.o
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obj-$(CONFIG_MAX5821) += max5821.o
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obj-$(CONFIG_MCP4725) += mcp4725.o
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269
drivers/iio/dac/m62332.c
Normal file
269
drivers/iio/dac/m62332.c
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@ -0,0 +1,269 @@
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/*
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* m62332.c - Support for Mitsubishi m62332 DAC
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*
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* Copyright (c) 2014 Dmitry Eremin-Solenikov
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*
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* Based on max517 driver:
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* Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/err.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/regulator/consumer.h>
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#define M62332_CHANNELS 2
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struct m62332_data {
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struct i2c_client *client;
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u16 vref_mv;
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struct regulator *vcc;
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struct mutex mutex;
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u8 raw[M62332_CHANNELS];
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#ifdef CONFIG_PM_SLEEP
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u8 save[M62332_CHANNELS];
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#endif
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};
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static int m62332_set_value(struct iio_dev *indio_dev,
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u8 val, int channel)
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{
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struct m62332_data *data = iio_priv(indio_dev);
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struct i2c_client *client = data->client;
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u8 outbuf[2];
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int res;
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if (val == data->raw[channel])
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return 0;
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outbuf[0] = channel;
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outbuf[1] = val;
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mutex_lock(&data->mutex);
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if (val) {
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res = regulator_enable(data->vcc);
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if (res)
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goto out;
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}
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res = i2c_master_send(client, outbuf, 2);
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if (res >= 0 && res != 2)
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res = -EIO;
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if (res < 0)
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goto out;
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data->raw[channel] = val;
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if (!val)
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regulator_disable(data->vcc);
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mutex_unlock(&data->mutex);
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return 0;
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out:
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mutex_unlock(&data->mutex);
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return res;
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}
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static int m62332_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val,
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int *val2,
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long m)
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{
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struct m62332_data *data = iio_priv(indio_dev);
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switch (m) {
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case IIO_CHAN_INFO_SCALE:
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/* Corresponds to Vref / 2^(bits) */
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*val = data->vref_mv;
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*val2 = 8;
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return IIO_VAL_FRACTIONAL_LOG2;
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case IIO_CHAN_INFO_RAW:
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*val = data->raw[chan->channel];
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_OFFSET:
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*val = 1;
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return IIO_VAL_INT;
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default:
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break;
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}
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return -EINVAL;
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}
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static int m62332_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val, int val2, long mask)
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{
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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 < 0 || val > 255)
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return -EINVAL;
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ret = m62332_set_value(indio_dev, val, chan->channel);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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#ifdef CONFIG_PM_SLEEP
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static int m62332_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 m62332_data *data = iio_priv(indio_dev);
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int ret;
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data->save[0] = data->raw[0];
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data->save[1] = data->raw[1];
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ret = m62332_set_value(indio_dev, 0, 0);
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if (ret < 0)
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return ret;
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return m62332_set_value(indio_dev, 0, 1);
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}
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static int m62332_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 m62332_data *data = iio_priv(indio_dev);
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int ret;
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ret = m62332_set_value(indio_dev, data->save[0], 0);
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if (ret < 0)
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return ret;
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return m62332_set_value(indio_dev, data->save[1], 1);
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}
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static SIMPLE_DEV_PM_OPS(m62332_pm_ops, m62332_suspend, m62332_resume);
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#define M62332_PM_OPS (&m62332_pm_ops)
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#else
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#define M62332_PM_OPS NULL
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#endif
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static const struct iio_info m62332_info = {
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.read_raw = m62332_read_raw,
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.write_raw = m62332_write_raw,
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.driver_module = THIS_MODULE,
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};
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#define M62332_CHANNEL(chan) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.output = 1, \
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.channel = (chan), \
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.datasheet_name = "CH" #chan, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_SCALE) | \
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BIT(IIO_CHAN_INFO_OFFSET), \
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}
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static const struct iio_chan_spec m62332_channels[M62332_CHANNELS] = {
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M62332_CHANNEL(0),
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M62332_CHANNEL(1)
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};
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static int m62332_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct m62332_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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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->client = client;
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mutex_init(&data->mutex);
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data->vcc = devm_regulator_get(&client->dev, "VCC");
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if (IS_ERR(data->vcc))
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return PTR_ERR(data->vcc);
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/* establish that the iio_dev is a child of the i2c device */
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indio_dev->dev.parent = &client->dev;
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indio_dev->num_channels = M62332_CHANNELS;
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indio_dev->channels = m62332_channels;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &m62332_info;
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ret = regulator_get_voltage(data->vcc);
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if (ret < 0)
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return ret;
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data->vref_mv = ret / 1000; /* mV */
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ret = iio_map_array_register(indio_dev, client->dev.platform_data);
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if (ret < 0)
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return ret;
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ret = iio_device_register(indio_dev);
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if (ret < 0)
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goto err;
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return 0;
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err:
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iio_map_array_unregister(indio_dev);
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return ret;
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}
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static int m62332_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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iio_device_unregister(indio_dev);
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iio_map_array_unregister(indio_dev);
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return 0;
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}
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static const struct i2c_device_id m62332_id[] = {
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{ "m62332", },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, m62332_id);
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static struct i2c_driver m62332_driver = {
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.driver = {
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.name = "m62332",
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.pm = M62332_PM_OPS,
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},
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.probe = m62332_probe,
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.remove = m62332_remove,
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.id_table = m62332_id,
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};
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module_i2c_driver(m62332_driver);
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MODULE_AUTHOR("Dmitry Eremin-Solenikov");
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MODULE_DESCRIPTION("M62332 8-bit DAC");
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MODULE_LICENSE("GPL v2");
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