mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-20 14:16:02 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 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 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
224 lines
4.8 KiB
C
224 lines
4.8 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);
|
|
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);
|
|
}
|
|
|
|
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 },
|
|
{ "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");
|