mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Mugilraj Dhavachelvan](/assets/img/avatar_default.png)
Use devm_iio_device_register() to avoid remove function and drop explicit call to iio_device_unregister(). Signed-off-by: Mugilraj Dhavachelvan <dmugil2000@gmail.com> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de> Link: https://lore.kernel.org/r/20210314175709.34301-1-dmugil2000@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
213 lines
4.5 KiB
C
213 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* max517.c - Support for Maxim MAX517, MAX518 and MAX519
|
|
*
|
|
* Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/err.h>
|
|
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/sysfs.h>
|
|
#include <linux/iio/dac/max517.h>
|
|
|
|
#define MAX517_DRV_NAME "max517"
|
|
|
|
/* Commands */
|
|
#define COMMAND_CHANNEL0 0x00
|
|
#define COMMAND_CHANNEL1 0x01 /* for MAX518 and MAX519 */
|
|
#define COMMAND_PD 0x08 /* Power Down */
|
|
|
|
enum max517_device_ids {
|
|
ID_MAX517,
|
|
ID_MAX518,
|
|
ID_MAX519,
|
|
ID_MAX520,
|
|
ID_MAX521,
|
|
};
|
|
|
|
struct max517_data {
|
|
struct i2c_client *client;
|
|
unsigned short vref_mv[8];
|
|
};
|
|
|
|
/*
|
|
* channel: bit 0: channel 1
|
|
* bit 1: channel 2
|
|
* (this way, it's possible to set both channels at once)
|
|
*/
|
|
static int max517_set_value(struct iio_dev *indio_dev,
|
|
long val, int channel)
|
|
{
|
|
struct max517_data *data = iio_priv(indio_dev);
|
|
struct i2c_client *client = data->client;
|
|
u8 outbuf[2];
|
|
int res;
|
|
|
|
if (val < 0 || val > 255)
|
|
return -EINVAL;
|
|
|
|
outbuf[0] = channel;
|
|
outbuf[1] = val;
|
|
|
|
res = i2c_master_send(client, outbuf, 2);
|
|
if (res < 0)
|
|
return res;
|
|
else if (res != 2)
|
|
return -EIO;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int max517_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val,
|
|
int *val2,
|
|
long m)
|
|
{
|
|
struct max517_data *data = iio_priv(indio_dev);
|
|
|
|
switch (m) {
|
|
case IIO_CHAN_INFO_SCALE:
|
|
/* Corresponds to Vref / 2^(bits) */
|
|
*val = data->vref_mv[chan->channel];
|
|
*val2 = 8;
|
|
return IIO_VAL_FRACTIONAL_LOG2;
|
|
default:
|
|
break;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int max517_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan, int val, int val2, long mask)
|
|
{
|
|
int ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
ret = max517_set_value(indio_dev, val, chan->channel);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __maybe_unused max517_suspend(struct device *dev)
|
|
{
|
|
u8 outbuf = COMMAND_PD;
|
|
|
|
return i2c_master_send(to_i2c_client(dev), &outbuf, 1);
|
|
}
|
|
|
|
static int __maybe_unused max517_resume(struct device *dev)
|
|
{
|
|
u8 outbuf = 0;
|
|
|
|
return i2c_master_send(to_i2c_client(dev), &outbuf, 1);
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(max517_pm_ops, max517_suspend, max517_resume);
|
|
|
|
static const struct iio_info max517_info = {
|
|
.read_raw = max517_read_raw,
|
|
.write_raw = max517_write_raw,
|
|
};
|
|
|
|
#define MAX517_CHANNEL(chan) { \
|
|
.type = IIO_VOLTAGE, \
|
|
.indexed = 1, \
|
|
.output = 1, \
|
|
.channel = (chan), \
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
|
|
BIT(IIO_CHAN_INFO_SCALE), \
|
|
}
|
|
|
|
static const struct iio_chan_spec max517_channels[] = {
|
|
MAX517_CHANNEL(0),
|
|
MAX517_CHANNEL(1),
|
|
MAX517_CHANNEL(2),
|
|
MAX517_CHANNEL(3),
|
|
MAX517_CHANNEL(4),
|
|
MAX517_CHANNEL(5),
|
|
MAX517_CHANNEL(6),
|
|
MAX517_CHANNEL(7),
|
|
};
|
|
|
|
static int max517_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct max517_data *data;
|
|
struct iio_dev *indio_dev;
|
|
struct max517_platform_data *platform_data = client->dev.platform_data;
|
|
int chan;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
data = iio_priv(indio_dev);
|
|
data->client = client;
|
|
|
|
switch (id->driver_data) {
|
|
case ID_MAX521:
|
|
indio_dev->num_channels = 8;
|
|
break;
|
|
case ID_MAX520:
|
|
indio_dev->num_channels = 4;
|
|
break;
|
|
case ID_MAX519:
|
|
case ID_MAX518:
|
|
indio_dev->num_channels = 2;
|
|
break;
|
|
default: /* single channel for MAX517 */
|
|
indio_dev->num_channels = 1;
|
|
break;
|
|
}
|
|
indio_dev->channels = max517_channels;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->info = &max517_info;
|
|
|
|
/*
|
|
* Reference voltage on MAX518 and default is 5V, else take vref_mv
|
|
* from platform_data
|
|
*/
|
|
for (chan = 0; chan < indio_dev->num_channels; chan++) {
|
|
if (id->driver_data == ID_MAX518 || !platform_data)
|
|
data->vref_mv[chan] = 5000; /* mV */
|
|
else
|
|
data->vref_mv[chan] = platform_data->vref_mv[chan];
|
|
}
|
|
|
|
return devm_iio_device_register(&client->dev, indio_dev);
|
|
}
|
|
|
|
static const struct i2c_device_id max517_id[] = {
|
|
{ "max517", ID_MAX517 },
|
|
{ "max518", ID_MAX518 },
|
|
{ "max519", ID_MAX519 },
|
|
{ "max520", ID_MAX520 },
|
|
{ "max521", ID_MAX521 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max517_id);
|
|
|
|
static struct i2c_driver max517_driver = {
|
|
.driver = {
|
|
.name = MAX517_DRV_NAME,
|
|
.pm = &max517_pm_ops,
|
|
},
|
|
.probe = max517_probe,
|
|
.id_table = max517_id,
|
|
};
|
|
module_i2c_driver(max517_driver);
|
|
|
|
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
|
|
MODULE_DESCRIPTION("MAX517/518/519/520/521 8-bit DAC");
|
|
MODULE_LICENSE("GPL");
|