![Paul Gortmaker](/assets/img/avatar_default.png)
None of these files are actually using any __init type directives and hence don't need to include <linux/init.h>. Most are just a left over from __devinit and __cpuinit removal, or simply due to code getting copied from one driver to the next. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
223 lines
5.2 KiB
C
223 lines
5.2 KiB
C
/*
|
|
* max517.c - Support for Maxim MAX517, MAX518 and MAX519
|
|
*
|
|
* Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#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,
|
|
};
|
|
|
|
struct max517_data {
|
|
struct i2c_client *client;
|
|
unsigned short vref_mv[2];
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int max517_suspend(struct device *dev)
|
|
{
|
|
u8 outbuf = COMMAND_PD;
|
|
|
|
return i2c_master_send(to_i2c_client(dev), &outbuf, 1);
|
|
}
|
|
|
|
static int 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);
|
|
#define MAX517_PM_OPS (&max517_pm_ops)
|
|
#else
|
|
#define MAX517_PM_OPS NULL
|
|
#endif
|
|
|
|
static const struct iio_info max517_info = {
|
|
.read_raw = max517_read_raw,
|
|
.write_raw = max517_write_raw,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
#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)
|
|
};
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
/* establish that the iio_dev is a child of the i2c device */
|
|
indio_dev->dev.parent = &client->dev;
|
|
|
|
/* reduced channel set for MAX517 */
|
|
if (id->driver_data == ID_MAX517)
|
|
indio_dev->num_channels = 1;
|
|
else
|
|
indio_dev->num_channels = 2;
|
|
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
|
|
*/
|
|
if (id->driver_data == ID_MAX518 || !platform_data) {
|
|
data->vref_mv[0] = data->vref_mv[1] = 5000; /* mV */
|
|
} else {
|
|
data->vref_mv[0] = platform_data->vref_mv[0];
|
|
data->vref_mv[1] = platform_data->vref_mv[1];
|
|
}
|
|
|
|
return iio_device_register(indio_dev);
|
|
}
|
|
|
|
static int max517_remove(struct i2c_client *client)
|
|
{
|
|
iio_device_unregister(i2c_get_clientdata(client));
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id max517_id[] = {
|
|
{ "max517", ID_MAX517 },
|
|
{ "max518", ID_MAX518 },
|
|
{ "max519", ID_MAX519 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max517_id);
|
|
|
|
static struct i2c_driver max517_driver = {
|
|
.driver = {
|
|
.name = MAX517_DRV_NAME,
|
|
.pm = MAX517_PM_OPS,
|
|
},
|
|
.probe = max517_probe,
|
|
.remove = max517_remove,
|
|
.id_table = max517_id,
|
|
};
|
|
module_i2c_driver(max517_driver);
|
|
|
|
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
|
|
MODULE_DESCRIPTION("MAX517/MAX518/MAX519 8-bit DAC");
|
|
MODULE_LICENSE("GPL");
|