linux/drivers/iio/dac/m62332.c
Thomas Gleixner c942fddf87 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
Based on 3 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] this program is distributed in the hope that
  it will be useful but without any warranty without even the implied
  warranty of merchantability or fitness for a particular purpose see
  the gnu general public license for more details

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] this program is distributed in the hope
  that it will be useful but without any warranty without even the
  implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:37 -07:00

263 lines
5.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* m62332.c - Support for Mitsubishi m62332 DAC
*
* Copyright (c) 2014 Dmitry Eremin-Solenikov
*
* Based on max517 driver:
* Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/iio/iio.h>
#include <linux/iio/driver.h>
#include <linux/regulator/consumer.h>
#define M62332_CHANNELS 2
struct m62332_data {
struct i2c_client *client;
struct regulator *vcc;
struct mutex mutex;
u8 raw[M62332_CHANNELS];
#ifdef CONFIG_PM_SLEEP
u8 save[M62332_CHANNELS];
#endif
};
static int m62332_set_value(struct iio_dev *indio_dev, u8 val, int channel)
{
struct m62332_data *data = iio_priv(indio_dev);
struct i2c_client *client = data->client;
u8 outbuf[2];
int res;
if (val == data->raw[channel])
return 0;
outbuf[0] = channel;
outbuf[1] = val;
mutex_lock(&data->mutex);
if (val) {
res = regulator_enable(data->vcc);
if (res)
goto out;
}
res = i2c_master_send(client, outbuf, ARRAY_SIZE(outbuf));
if (res >= 0 && res != ARRAY_SIZE(outbuf))
res = -EIO;
if (res < 0)
goto out;
data->raw[channel] = val;
if (!val)
regulator_disable(data->vcc);
mutex_unlock(&data->mutex);
return 0;
out:
mutex_unlock(&data->mutex);
return res;
}
static int m62332_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long mask)
{
struct m62332_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
/* Corresponds to Vref / 2^(bits) */
ret = regulator_get_voltage(data->vcc);
if (ret < 0)
return ret;
*val = ret / 1000; /* mV */
*val2 = 8;
return IIO_VAL_FRACTIONAL_LOG2;
case IIO_CHAN_INFO_RAW:
*val = data->raw[chan->channel];
return IIO_VAL_INT;
case IIO_CHAN_INFO_OFFSET:
*val = 1;
return IIO_VAL_INT;
default:
break;
}
return -EINVAL;
}
static int m62332_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val, int val2,
long mask)
{
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (val < 0 || val > 255)
return -EINVAL;
return m62332_set_value(indio_dev, val, chan->channel);
default:
break;
}
return -EINVAL;
}
#ifdef CONFIG_PM_SLEEP
static int m62332_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct m62332_data *data = iio_priv(indio_dev);
int ret;
data->save[0] = data->raw[0];
data->save[1] = data->raw[1];
ret = m62332_set_value(indio_dev, 0, 0);
if (ret < 0)
return ret;
return m62332_set_value(indio_dev, 0, 1);
}
static int m62332_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct m62332_data *data = iio_priv(indio_dev);
int ret;
ret = m62332_set_value(indio_dev, data->save[0], 0);
if (ret < 0)
return ret;
return m62332_set_value(indio_dev, data->save[1], 1);
}
static SIMPLE_DEV_PM_OPS(m62332_pm_ops, m62332_suspend, m62332_resume);
#define M62332_PM_OPS (&m62332_pm_ops)
#else
#define M62332_PM_OPS NULL
#endif
static const struct iio_info m62332_info = {
.read_raw = m62332_read_raw,
.write_raw = m62332_write_raw,
};
#define M62332_CHANNEL(chan) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.output = 1, \
.channel = (chan), \
.datasheet_name = "CH" #chan, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_OFFSET), \
}
static const struct iio_chan_spec m62332_channels[M62332_CHANNELS] = {
M62332_CHANNEL(0),
M62332_CHANNEL(1)
};
static int m62332_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct m62332_data *data;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
mutex_init(&data->mutex);
data->vcc = devm_regulator_get(&client->dev, "VCC");
if (IS_ERR(data->vcc))
return PTR_ERR(data->vcc);
/* establish that the iio_dev is a child of the i2c device */
indio_dev->dev.parent = &client->dev;
indio_dev->num_channels = ARRAY_SIZE(m62332_channels);
indio_dev->channels = m62332_channels;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &m62332_info;
ret = iio_map_array_register(indio_dev, client->dev.platform_data);
if (ret < 0)
return ret;
ret = iio_device_register(indio_dev);
if (ret < 0)
goto err;
return 0;
err:
iio_map_array_unregister(indio_dev);
return ret;
}
static int m62332_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
iio_device_unregister(indio_dev);
iio_map_array_unregister(indio_dev);
m62332_set_value(indio_dev, 0, 0);
m62332_set_value(indio_dev, 0, 1);
return 0;
}
static const struct i2c_device_id m62332_id[] = {
{ "m62332", },
{ }
};
MODULE_DEVICE_TABLE(i2c, m62332_id);
static struct i2c_driver m62332_driver = {
.driver = {
.name = "m62332",
.pm = M62332_PM_OPS,
},
.probe = m62332_probe,
.remove = m62332_remove,
.id_table = m62332_id,
};
module_i2c_driver(m62332_driver);
MODULE_AUTHOR("Dmitry Eremin-Solenikov");
MODULE_DESCRIPTION("M62332 8-bit DAC");
MODULE_LICENSE("GPL v2");