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iio:dac:ad5686: Add support for various number of channels 

This patch adds a new num_channels attribute as part of the
ad5686_chip_info struct which replaces the AD5686_DAC_CHANNELS define. This
is a necessary step, since this driver should support similar devices which
differ only in the number of channels.

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Stefan Popa 2018-04-11 14:52:31 +03:00 committed by Jonathan Cameron
parent 16a3c17575
commit f4a27306d4
1 changed files with 25 additions and 20 deletions
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45
drivers/iio/dac/ad5686.c
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@ -18,8 +18,6 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#define AD5686_DAC_CHANNELS 4
#define AD5686_ADDR(x) ((x) << 16)
#define AD5686_CMD(x) ((x) << 20)
@ -45,12 +43,14 @@
/**
* struct ad5686_chip_info - chip specific information
* @int_vref_mv: AD5620/40/60: the internal reference voltage
* @num_channels: number of channels
* @channel: channel specification
*/
struct ad5686_chip_info {
u16 int_vref_mv;
struct iio_chan_spec channel[AD5686_DAC_CHANNELS];
unsigned int num_channels;
struct iio_chan_spec *channels;
};
/**
@ -268,14 +268,14 @@ static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
{ },
};
#define AD5868_CHANNEL(chan, bits, _shift) { \
#define AD5868_CHANNEL(chan, addr, bits, _shift) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.output = 1, \
.channel = chan, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
.address = AD5686_ADDR_DAC(chan), \
.address = addr, \
.scan_type = { \
.sign = 'u', \
.realbits = (bits), \
@ -285,31 +285,36 @@ static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
.ext_info = ad5686_ext_info, \
}
#define DECLARE_AD5686_CHANNELS(name, bits, _shift) \
static struct iio_chan_spec name[] = { \
AD5868_CHANNEL(0, 1, bits, _shift), \
AD5868_CHANNEL(1, 2, bits, _shift), \
AD5868_CHANNEL(2, 4, bits, _shift), \
AD5868_CHANNEL(3, 8, bits, _shift), \
}
DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);
DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);
DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
[ID_AD5684] = {
.channel[0] = AD5868_CHANNEL(0, 12, 4),
.channel[1] = AD5868_CHANNEL(1, 12, 4),
.channel[2] = AD5868_CHANNEL(2, 12, 4),
.channel[3] = AD5868_CHANNEL(3, 12, 4),
.channels = ad5684_channels,
.num_channels = 4,
.int_vref_mv = 2500,
},
[ID_AD5685] = {
.channel[0] = AD5868_CHANNEL(0, 14, 2),
.channel[1] = AD5868_CHANNEL(1, 14, 2),
.channel[2] = AD5868_CHANNEL(2, 14, 2),
.channel[3] = AD5868_CHANNEL(3, 14, 2),
.channels = ad5685r_channels,
.int_vref_mv = 2500,
.num_channels = 4,
},
[ID_AD5686] = {
.channel[0] = AD5868_CHANNEL(0, 16, 0),
.channel[1] = AD5868_CHANNEL(1, 16, 0),
.channel[2] = AD5868_CHANNEL(2, 16, 0),
.channel[3] = AD5868_CHANNEL(3, 16, 0),
.channels = ad5686_channels,
.num_channels = 4,
.int_vref_mv = 2500,
},
};
static int ad5686_probe(struct spi_device *spi)
{
struct ad5686_state *st;
@ -353,8 +358,8 @@ static int ad5686_probe(struct spi_device *spi)
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->info = &ad5686_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = st->chip_info->channel;
indio_dev->num_channels = AD5686_DAC_CHANNELS;
indio_dev->channels = st->chip_info->channels;
indio_dev->num_channels = st->chip_info->num_channels;
ret = ad5686_spi_write(st, AD5686_CMD_INTERNAL_REFER_SETUP, 0,
!!voltage_uv, 0);