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iio: potentiometer: ds1803: Add channel information in device data 

Adding each device wiper count and channel information into
device private data.
Utilizing addr member of struct iio_chan_spec to get the
wiper register address so that the value can be read or write
to the same address.

Signed-off-by: Jagath Jog J <jagathjog1996@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220223163525.13399-4-jagathjog1996@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jagath Jog J 2022-02-23 22:05:21 +05:30 committed by Jonathan Cameron
parent 4a68b32611
commit a98d2b029b
1 changed files with 22 additions and 8 deletions
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30
drivers/iio/potentiometer/ds1803.c
View File

@ -16,7 +16,8 @@
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#define DS1803_WRITE(chan) (0xa8 | ((chan) + 1))
#define DS1803_WIPER_0 0xA9
#define DS1803_WIPER_1 0xAA
enum ds1803_type {
DS1803_010,
@ -25,8 +26,11 @@ enum ds1803_type {
};
struct ds1803_cfg {
int wipers;
int avail[3];
int kohms;
const struct iio_chan_spec *channels;
u8 num_channels;
};
struct ds1803_data {
@ -34,33 +38,43 @@ struct ds1803_data {
const struct ds1803_cfg *cfg;
};
#define DS1803_CHANNEL(ch) { \
#define DS1803_CHANNEL(ch, addr) { \
.type = IIO_RESISTANCE, \
.indexed = 1, \
.output = 1, \
.channel = (ch), \
.address = (addr), \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_RAW), \
}
static const struct iio_chan_spec ds1803_channels[] = {
DS1803_CHANNEL(0),
DS1803_CHANNEL(1),
DS1803_CHANNEL(0, DS1803_WIPER_0),
DS1803_CHANNEL(1, DS1803_WIPER_1),
};
static const struct ds1803_cfg ds1803_cfg[] = {
[DS1803_010] = {
.wipers = 2,
.avail = { 0, 1, 255 },
.kohms = 10,
.channels = ds1803_channels,
.num_channels = ARRAY_SIZE(ds1803_channels),
},
[DS1803_050] = {
.wipers = 2,
.avail = { 0, 1, 255 },
.kohms = 50,
.channels = ds1803_channels,
.num_channels = ARRAY_SIZE(ds1803_channels),
},
[DS1803_100] = {
.wipers = 2,
.avail = { 0, 1, 255 },
.kohms = 100,
.channels = ds1803_channels,
.num_channels = ARRAY_SIZE(ds1803_channels),
},
};
@ -97,7 +111,7 @@ static int ds1803_write_raw(struct iio_dev *indio_dev,
int val, int val2, long mask)
{
struct ds1803_data *data = iio_priv(indio_dev);
int pot = chan->channel;
u8 addr = chan->address;
int max_pos = data->cfg->avail[2];
if (val2 != 0)
@ -112,7 +126,7 @@ static int ds1803_write_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
return i2c_smbus_write_byte_data(data->client, DS1803_WRITE(pot), val);
return i2c_smbus_write_byte_data(data->client, addr, val);
}
static int ds1803_read_avail(struct iio_dev *indio_dev,
@ -155,8 +169,8 @@ static int ds1803_probe(struct i2c_client *client, const struct i2c_device_id *i
data->cfg = &ds1803_cfg[id->driver_data];
indio_dev->info = &ds1803_info;
indio_dev->channels = ds1803_channels;
indio_dev->num_channels = ARRAY_SIZE(ds1803_channels);
indio_dev->channels = data->cfg->channels;
indio_dev->num_channels = data->cfg->num_channels;
indio_dev->name = client->name;
return devm_iio_device_register(dev, indio_dev);