Release 4.11 drivers/iio/dac/max517.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,
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Roland Stigge | 87 | 80.56% | 2 | 40.00% |
| Lars-Peter Clausen | 19 | 17.59% | 1 | 20.00% |
| Jonathan Cameron | 2 | 1.85% | 2 | 40.00% |
| Total | 108 | 100.00% | 5 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lars-Peter Clausen | 38 | 51.35% | 2 | 40.00% |
| Roland Stigge | 34 | 45.95% | 1 | 20.00% |
| Jonathan Cameron | 2 | 2.70% | 2 | 40.00% |
| Total | 74 | 100.00% | 5 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lars-Peter Clausen | 45 | 72.58% | 1 | 50.00% |
| Roland Stigge | 17 | 27.42% | 1 | 50.00% |
| Total | 62 | 100.00% | 2 | 100.00% |
#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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Roland Stigge | 24 | 80.00% | 1 | 50.00% |
| Lars-Peter Clausen | 6 | 20.00% | 1 | 50.00% |
| Total | 30 | 100.00% | 2 | 100.00% |
static int max517_resume(struct device *dev)
{
u8 outbuf = 0;
return i2c_master_send(to_i2c_client(dev), &outbuf, 1);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Roland Stigge | 24 | 80.00% | 1 | 50.00% |
| Lars-Peter Clausen | 6 | 20.00% | 1 | 50.00% |
| Total | 30 | 100.00% | 2 | 100.00% |
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),
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);
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;
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 iio_device_register(indio_dev);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Roland Stigge | 128 | 56.39% | 2 | 28.57% |
| Antonio Fiol | 56 | 24.67% | 1 | 14.29% |
| Jonathan Cameron | 17 | 7.49% | 1 | 14.29% |
| Lars-Peter Clausen | 16 | 7.05% | 1 | 14.29% |
| Sachin Kamat | 10 | 4.41% | 2 | 28.57% |
| Total | 227 | 100.00% | 7 | 100.00% |
static int max517_remove(struct i2c_client *client)
{
iio_device_unregister(i2c_get_clientdata(client));
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Roland Stigge | 14 | 63.64% | 1 | 50.00% |
| Peter Meerwald-Stadler | 8 | 36.36% | 1 | 50.00% |
| Total | 22 | 100.00% | 2 | 100.00% |
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,
.remove = max517_remove,
.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");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Roland Stigge | 480 | 57.28% | 2 | 11.76% |
| Lars-Peter Clausen | 186 | 22.20% | 5 | 29.41% |
| Antonio Fiol | 105 | 12.53% | 1 | 5.88% |
| Jonathan Cameron | 49 | 5.85% | 6 | 35.29% |
| Sachin Kamat | 10 | 1.19% | 2 | 11.76% |
| Peter Meerwald-Stadler | 8 | 0.95% | 1 | 5.88% |
| Total | 838 | 100.00% | 17 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.