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iio: adc: ad7124: add sequencer support

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Add sequencer support for AD7124.

Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
Link: https://lore.kernel.org/r/20220322105029.86389-6-alexandru.tachici@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alexandru Tachici 2022-03-22 12:50:28 +02:00 committed by Jonathan Cameron
parent 8bea9af887
commit 5cfe8a1c25
1 changed files with 65 additions and 9 deletions
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74
drivers/iio/adc/ad7124.c
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@ -43,6 +43,8 @@
#define AD7124_STATUS_POR_FLAG_MSK BIT(4)
/* AD7124_ADC_CONTROL */
#define AD7124_ADC_STATUS_EN_MSK BIT(10)
#define AD7124_ADC_STATUS_EN(x) FIELD_PREP(AD7124_ADC_STATUS_EN_MSK, x)
#define AD7124_ADC_CTRL_REF_EN_MSK BIT(8)
#define AD7124_ADC_CTRL_REF_EN(x) FIELD_PREP(AD7124_ADC_CTRL_REF_EN_MSK, x)
#define AD7124_ADC_CTRL_PWR_MSK GENMASK(7, 6)
@ -500,26 +502,70 @@ static int ad7124_prepare_read(struct ad7124_state *st, int address)
return ad7124_enable_channel(st, &st->channels[address]);
}
static int __ad7124_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
{
struct ad7124_state *st = container_of(sd, struct ad7124_state, sd);
return ad7124_prepare_read(st, channel);
}
static int ad7124_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
{
struct ad7124_state *st = container_of(sd, struct ad7124_state, sd);
int ret;
mutex_lock(&st->cfgs_lock);
ret = ad7124_prepare_read(st, channel);
ret = __ad7124_set_channel(sd, channel);
mutex_unlock(&st->cfgs_lock);
return ret;
}
static int ad7124_append_status(struct ad_sigma_delta *sd, bool append)
{
struct ad7124_state *st = container_of(sd, struct ad7124_state, sd);
unsigned int adc_control = st->adc_control;
int ret;
adc_control &= ~AD7124_ADC_STATUS_EN_MSK;
adc_control |= AD7124_ADC_STATUS_EN(append);
ret = ad_sd_write_reg(&st->sd, AD7124_ADC_CONTROL, 2, adc_control);
if (ret < 0)
return ret;
st->adc_control = adc_control;
return 0;
}
static int ad7124_disable_all(struct ad_sigma_delta *sd)
{
struct ad7124_state *st = container_of(sd, struct ad7124_state, sd);
int ret;
int i;
for (i = 0; i < st->num_channels; i++) {
ret = ad7124_spi_write_mask(st, AD7124_CHANNEL(i), AD7124_CHANNEL_EN_MSK, 0, 2);
if (ret < 0)
return ret;
}
return 0;
}
static const struct ad_sigma_delta_info ad7124_sigma_delta_info = {
.set_channel = ad7124_set_channel,
.append_status = ad7124_append_status,
.disable_all = ad7124_disable_all,
.set_mode = ad7124_set_mode,
.has_registers = true,
.addr_shift = 0,
.read_mask = BIT(6),
.status_ch_mask = GENMASK(3, 0),
.data_reg = AD7124_DATA,
.irq_flags = IRQF_TRIGGER_FALLING
.num_slots = 8,
.irq_flags = IRQF_TRIGGER_FALLING,
};
static int ad7124_read_raw(struct iio_dev *indio_dev,
@ -677,15 +723,23 @@ static int ad7124_update_scan_mode(struct iio_dev *indio_dev,
int ret;
int i;
mutex_lock(&st->cfgs_lock);
for (i = 0; i < st->num_channels; i++) {
bit_set = test_bit(i, scan_mask);
ret = ad7124_spi_write_mask(st, AD7124_CHANNEL(i),
AD7124_CHANNEL_EN_MSK,
AD7124_CHANNEL_EN(bit_set),
2);
if (ret < 0)
if (bit_set)
ret = __ad7124_set_channel(&st->sd, i);
else
ret = ad7124_spi_write_mask(st, AD7124_CHANNEL(i), AD7124_CHANNEL_EN_MSK,
0, 2);
if (ret < 0) {
mutex_unlock(&st->cfgs_lock);
return ret;
}
}
mutex_unlock(&st->cfgs_lock);
return 0;
}
@ -906,12 +960,14 @@ static int ad7124_probe(struct spi_device *spi)
st->chip_info = info;
ad_sd_init(&st->sd, indio_dev, spi, &ad7124_sigma_delta_info);
indio_dev->name = st->chip_info->name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &ad7124_info;
ret = ad_sd_init(&st->sd, indio_dev, spi, &ad7124_sigma_delta_info);
if (ret < 0)
return ret;
ret = ad7124_of_parse_channel_config(indio_dev, spi->dev.of_node);
if (ret < 0)
return ret;