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iio: adc: ad7124: Implement system calibration

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Allow triggering both zero-scale and full-scale calibration via sysfs in
the same way as it's done for ad7173.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://patch.msgid.link/20250303114659.1672695-18-u.kleine-koenig@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Uwe Kleine-König
2025-03-03 12:47:06 +01:00
committed by Jonathan Cameron
parent 47036a03a3
commit df1f2e1470
1 changed files with 135 additions and 17 deletions
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152
drivers/iio/adc/ad7124.c
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@@ -181,6 +181,7 @@ struct ad7124_channel {
struct ad7124_channel_config cfg;
unsigned int ain;
unsigned int slot;
u8 syscalib_mode;
};
struct ad7124_state {
@@ -202,23 +203,6 @@ struct ad7124_state {
DECLARE_KFIFO(live_cfgs_fifo, struct ad7124_channel_config *, AD7124_MAX_CONFIGS);
};
static const struct iio_chan_spec ad7124_channel_template = {
.type = IIO_VOLTAGE,
.indexed = 1,
.differential = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
.scan_type = {
.sign = 'u',
.realbits = 24,
.storagebits = 32,
.endianness = IIO_BE,
},
};
static struct ad7124_chip_info ad7124_chip_info_tbl[] = {
[ID_AD7124_4] = {
.name = "ad7124-4",
@@ -903,6 +887,140 @@ static int ad7124_check_chip_id(struct ad7124_state *st)
return 0;
}
enum {
AD7124_SYSCALIB_ZERO_SCALE,
AD7124_SYSCALIB_FULL_SCALE,
};
static int ad7124_syscalib_locked(struct ad7124_state *st, const struct iio_chan_spec *chan)
{
struct device *dev = &st->sd.spi->dev;
struct ad7124_channel *ch = &st->channels[chan->channel];
int ret;
if (ch->syscalib_mode == AD7124_SYSCALIB_ZERO_SCALE) {
ch->cfg.calibration_offset = 0x800000;
ret = ad_sd_calibrate(&st->sd, AD7124_MODE_CAL_SYS_ZERO,
chan->address);
if (ret < 0)
return ret;
ret = ad_sd_read_reg(&st->sd, AD7124_OFFSET(ch->cfg.cfg_slot), 3,
&ch->cfg.calibration_offset);
if (ret < 0)
return ret;
dev_dbg(dev, "offset for channel %d after zero-scale calibration: 0x%x\n",
chan->channel, ch->cfg.calibration_offset);
} else {
ch->cfg.calibration_gain = st->gain_default;
ret = ad_sd_calibrate(&st->sd, AD7124_MODE_CAL_SYS_FULL,
chan->address);
if (ret < 0)
return ret;
ret = ad_sd_read_reg(&st->sd, AD7124_GAIN(ch->cfg.cfg_slot), 3,
&ch->cfg.calibration_gain);
if (ret < 0)
return ret;
dev_dbg(dev, "gain for channel %d after full-scale calibration: 0x%x\n",
chan->channel, ch->cfg.calibration_gain);
}
return 0;
}
static ssize_t ad7124_write_syscalib(struct iio_dev *indio_dev,
uintptr_t private,
const struct iio_chan_spec *chan,
const char *buf, size_t len)
{
struct ad7124_state *st = iio_priv(indio_dev);
bool sys_calib;
int ret;
ret = kstrtobool(buf, &sys_calib);
if (ret)
return ret;
if (!sys_calib)
return len;
if (!iio_device_claim_direct(indio_dev))
return -EBUSY;
ret = ad7124_syscalib_locked(st, chan);
iio_device_release_direct(indio_dev);
return ret ?: len;
}
static const char * const ad7124_syscalib_modes[] = {
[AD7124_SYSCALIB_ZERO_SCALE] = "zero_scale",
[AD7124_SYSCALIB_FULL_SCALE] = "full_scale",
};
static int ad7124_set_syscalib_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
unsigned int mode)
{
struct ad7124_state *st = iio_priv(indio_dev);
st->channels[chan->channel].syscalib_mode = mode;
return 0;
}
static int ad7124_get_syscalib_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct ad7124_state *st = iio_priv(indio_dev);
return st->channels[chan->channel].syscalib_mode;
}
static const struct iio_enum ad7124_syscalib_mode_enum = {
.items = ad7124_syscalib_modes,
.num_items = ARRAY_SIZE(ad7124_syscalib_modes),
.set = ad7124_set_syscalib_mode,
.get = ad7124_get_syscalib_mode
};
static const struct iio_chan_spec_ext_info ad7124_calibsys_ext_info[] = {
{
.name = "sys_calibration",
.write = ad7124_write_syscalib,
.shared = IIO_SEPARATE,
},
IIO_ENUM("sys_calibration_mode", IIO_SEPARATE,
&ad7124_syscalib_mode_enum),
IIO_ENUM_AVAILABLE("sys_calibration_mode", IIO_SHARED_BY_TYPE,
&ad7124_syscalib_mode_enum),
{ }
};
static const struct iio_chan_spec ad7124_channel_template = {
.type = IIO_VOLTAGE,
.indexed = 1,
.differential = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
.scan_type = {
.sign = 'u',
.realbits = 24,
.storagebits = 32,
.endianness = IIO_BE,
},
.ext_info = ad7124_calibsys_ext_info,
};
/*
* Input specifiers 8 - 15 are explicitly reserved for ad7124-4
* while they are fine for ad7124-8. Values above 31 don't fit