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iio: adc: ad7380: add support for adaq4370-4 and adaq4380-4
adaq4370-4 (2MSPS) and adaq4380-4 (4MSPS) are quad-channel precision data acquisition signal chain μModule solutions compatible with the ad738x family, with the following differences: - pin selectable gain in front of each 4 adc - internal reference is 3V derived from refin-supply (5V) - additional supplies This implies that IIO_CHAN_INFO_SCALE can not be shared by type for these new devices. Signed-off-by: Julien Stephan <jstephan@baylibre.com> Reviewed-by: David Lechner <dlechner@baylibre.com> Link: https://patch.msgid.link/20241030-ad7380-add-adaq4380-4-support-v4-4-864ff02babae@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Julien Stephan
Jonathan Cameron
parent
9bb0e49a22
commit
c904e6dcf4
@ -13,6 +13,8 @@
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* ad7381-4 : https://www.analog.com/media/en/technical-documentation/data-sheets/ad7381-4.pdf
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* ad7383/4-4 : https://www.analog.com/media/en/technical-documentation/data-sheets/ad7383-4-ad7384-4.pdf
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* ad7386/7/8-4 : https://www.analog.com/media/en/technical-documentation/data-sheets/ad7386-4-7387-4-7388-4.pdf
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* adaq4370-4 : https://www.analog.com/media/en/technical-documentation/data-sheets/adaq4370-4.pdf
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* adaq4380-4 : https://www.analog.com/media/en/technical-documentation/data-sheets/adaq4380-4.pdf
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*/
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#include <linux/align.h>
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@ -22,11 +24,14 @@
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/math.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/units.h>
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#include <linux/util_macros.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/iio.h>
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@ -36,6 +41,8 @@
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#define MAX_NUM_CHANNELS 8
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/* 2.5V internal reference voltage */
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#define AD7380_INTERNAL_REF_MV 2500
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/* 3.3V internal reference voltage for ADAQ */
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#define ADAQ4380_INTERNAL_REF_MV 3300
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/* reading and writing registers is more reliable at lower than max speed */
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#define AD7380_REG_WR_SPEED_HZ 10000000
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@ -82,6 +89,7 @@
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* supports only 1 SDO line (standard SPI transaction)
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*/
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#define AD7380_NUM_SDO_LINES 1
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#define AD7380_DEFAULT_GAIN_MILLI 1000
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struct ad7380_timing_specs {
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const unsigned int t_csh_ns; /* CS minimum high time */
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@ -92,10 +100,12 @@ struct ad7380_chip_info {
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const struct iio_chan_spec *channels;
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unsigned int num_channels;
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unsigned int num_simult_channels;
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bool has_hardware_gain;
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bool has_mux;
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const char * const *supplies;
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unsigned int num_supplies;
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bool external_ref_only;
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bool adaq_internal_ref_only;
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const char * const *vcm_supplies;
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unsigned int num_vcm_supplies;
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const unsigned long *available_scan_masks;
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@ -187,11 +197,12 @@ static const struct iio_scan_type ad7380_scan_type_16_u[] = {
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},
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};
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#define AD7380_CHANNEL(index, bits, diff, sign) { \
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#define _AD7380_CHANNEL(index, bits, diff, sign, gain) { \
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.type = IIO_VOLTAGE, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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((gain) ? BIT(IIO_CHAN_INFO_SCALE) : 0) | \
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((diff) ? 0 : BIT(IIO_CHAN_INFO_OFFSET)), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
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.info_mask_shared_by_type = ((gain) ? 0 : BIT(IIO_CHAN_INFO_SCALE)) | \
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
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.info_mask_shared_by_type_available = \
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
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@ -205,6 +216,12 @@ static const struct iio_scan_type ad7380_scan_type_16_u[] = {
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.num_ext_scan_type = ARRAY_SIZE(ad7380_scan_type_##bits##_##sign), \
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}
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#define AD7380_CHANNEL(index, bits, diff, sign) \
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_AD7380_CHANNEL(index, bits, diff, sign, false)
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#define ADAQ4380_CHANNEL(index, bits, diff, sign) \
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_AD7380_CHANNEL(index, bits, diff, sign, true)
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#define DEFINE_AD7380_2_CHANNEL(name, bits, diff, sign) \
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static const struct iio_chan_spec name[] = { \
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AD7380_CHANNEL(0, bits, diff, sign), \
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@ -221,6 +238,15 @@ static const struct iio_chan_spec name[] = { \
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IIO_CHAN_SOFT_TIMESTAMP(4), \
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}
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#define DEFINE_ADAQ4380_4_CHANNEL(name, bits, diff, sign) \
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static const struct iio_chan_spec name[] = { \
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ADAQ4380_CHANNEL(0, bits, diff, sign), \
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ADAQ4380_CHANNEL(1, bits, diff, sign), \
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ADAQ4380_CHANNEL(2, bits, diff, sign), \
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ADAQ4380_CHANNEL(3, bits, diff, sign), \
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IIO_CHAN_SOFT_TIMESTAMP(4), \
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}
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#define DEFINE_AD7380_8_CHANNEL(name, bits, diff, sign) \
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static const struct iio_chan_spec name[] = { \
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AD7380_CHANNEL(0, bits, diff, sign), \
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@ -239,6 +265,7 @@ DEFINE_AD7380_2_CHANNEL(ad7380_channels, 16, 1, s);
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DEFINE_AD7380_2_CHANNEL(ad7381_channels, 14, 1, s);
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DEFINE_AD7380_4_CHANNEL(ad7380_4_channels, 16, 1, s);
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DEFINE_AD7380_4_CHANNEL(ad7381_4_channels, 14, 1, s);
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DEFINE_ADAQ4380_4_CHANNEL(adaq4380_4_channels, 16, 1, s);
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/* pseudo differential */
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DEFINE_AD7380_2_CHANNEL(ad7383_channels, 16, 0, s);
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DEFINE_AD7380_2_CHANNEL(ad7384_channels, 14, 0, s);
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@ -257,6 +284,10 @@ static const char * const ad7380_supplies[] = {
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"vcc", "vlogic",
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};
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static const char * const adaq4380_supplies[] = {
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"ldo", "vcc", "vlogic", "vs-p", "vs-n", "refin",
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};
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static const char * const ad7380_2_channel_vcm_supplies[] = {
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"aina", "ainb",
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};
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@ -347,6 +378,11 @@ static const int ad7380_oversampling_ratios[] = {
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1, 2, 4, 8, 16, 32,
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};
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/* Gains stored as fractions of 1000 so they can be expressed by integers. */
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static const int ad7380_gains[] = {
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300, 600, 1000, 1600,
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};
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static const struct ad7380_chip_info ad7380_chip_info = {
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.name = "ad7380",
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.channels = ad7380_channels,
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@ -516,6 +552,32 @@ static const struct ad7380_chip_info ad7388_4_chip_info = {
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.timing_specs = &ad7380_4_timing,
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};
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static const struct ad7380_chip_info adaq4370_4_chip_info = {
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.name = "adaq4370-4",
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.channels = adaq4380_4_channels,
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.num_channels = ARRAY_SIZE(adaq4380_4_channels),
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.num_simult_channels = 4,
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.supplies = adaq4380_supplies,
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.num_supplies = ARRAY_SIZE(adaq4380_supplies),
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.adaq_internal_ref_only = true,
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.has_hardware_gain = true,
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.available_scan_masks = ad7380_4_channel_scan_masks,
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.timing_specs = &ad7380_4_timing,
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};
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static const struct ad7380_chip_info adaq4380_4_chip_info = {
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.name = "adaq4380-4",
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.channels = adaq4380_4_channels,
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.num_channels = ARRAY_SIZE(adaq4380_4_channels),
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.num_simult_channels = 4,
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.supplies = adaq4380_supplies,
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.num_supplies = ARRAY_SIZE(adaq4380_supplies),
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.adaq_internal_ref_only = true,
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.has_hardware_gain = true,
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.available_scan_masks = ad7380_4_channel_scan_masks,
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.timing_specs = &ad7380_4_timing,
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};
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struct ad7380_state {
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const struct ad7380_chip_info *chip_info;
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struct spi_device *spi;
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@ -526,6 +588,7 @@ struct ad7380_state {
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bool seq;
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unsigned int vref_mv;
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unsigned int vcm_mv[MAX_NUM_CHANNELS];
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unsigned int gain_milli[MAX_NUM_CHANNELS];
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/* xfers, message an buffer for reading sample data */
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struct spi_transfer normal_xfer[2];
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struct spi_message normal_msg;
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@ -876,8 +939,15 @@ static int ad7380_read_raw(struct iio_dev *indio_dev,
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* * (2 × VREF) / 2^N, for differential chips
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* * VREF / 2^N, for pseudo-differential chips
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* where N is the ADC resolution (i.e realbits)
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*
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* The gain is stored as a fraction of 1000 and, as we need to
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* divide vref_mv by the gain, we invert the gain/1000 fraction.
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*/
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*val = st->vref_mv;
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if (st->chip_info->has_hardware_gain)
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*val = mult_frac(st->vref_mv, MILLI,
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st->gain_milli[chan->scan_index]);
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else
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*val = st->vref_mv;
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*val2 = scan_type->realbits - chan->differential;
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return IIO_VAL_FRACTIONAL_LOG2;
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@ -1059,7 +1129,19 @@ static int ad7380_probe(struct spi_device *spi)
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"Failed to enable power supplies\n");
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fsleep(T_POWERUP_US);
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if (st->chip_info->external_ref_only) {
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if (st->chip_info->adaq_internal_ref_only) {
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/*
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* ADAQ chips use fixed internal reference but still
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* require a specific reference supply to power it.
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* "refin" is already enabled with other power supplies
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* in bulk_get_enable().
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*/
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st->vref_mv = ADAQ4380_INTERNAL_REF_MV;
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/* these chips don't have a register bit for this */
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external_ref_en = false;
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} else if (st->chip_info->external_ref_only) {
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ret = devm_regulator_get_enable_read_voltage(dev, "refin");
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if (ret < 0)
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return dev_err_probe(dev, ret,
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@ -1103,6 +1185,42 @@ static int ad7380_probe(struct spi_device *spi)
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st->vcm_mv[i] = ret / 1000;
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}
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for (i = 0; i < MAX_NUM_CHANNELS; i++)
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st->gain_milli[i] = AD7380_DEFAULT_GAIN_MILLI;
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if (st->chip_info->has_hardware_gain) {
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device_for_each_child_node_scoped(dev, node) {
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unsigned int channel, gain;
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int gain_idx;
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ret = fwnode_property_read_u32(node, "reg", &channel);
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if (ret)
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return dev_err_probe(dev, ret,
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"Failed to read reg property\n");
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if (channel >= st->chip_info->num_channels - 1)
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return dev_err_probe(dev, -EINVAL,
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"Invalid channel number %i\n",
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channel);
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ret = fwnode_property_read_u32(node, "adi,gain-milli",
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&gain);
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if (ret && ret != -EINVAL)
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return dev_err_probe(dev, ret,
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"Failed to read gain for channel %i\n",
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channel);
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if (ret != -EINVAL) {
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/*
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* Match gain value from dt to one of supported
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* gains
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*/
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gain_idx = find_closest(gain, ad7380_gains,
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ARRAY_SIZE(ad7380_gains));
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st->gain_milli[channel] = ad7380_gains[gain_idx];
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}
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}
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}
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st->regmap = devm_regmap_init(dev, NULL, st, &ad7380_regmap_config);
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if (IS_ERR(st->regmap))
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return dev_err_probe(dev, PTR_ERR(st->regmap),
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@ -1185,6 +1303,8 @@ static const struct of_device_id ad7380_of_match_table[] = {
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{ .compatible = "adi,ad7386-4", .data = &ad7386_4_chip_info },
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{ .compatible = "adi,ad7387-4", .data = &ad7387_4_chip_info },
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{ .compatible = "adi,ad7388-4", .data = &ad7388_4_chip_info },
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{ .compatible = "adi,adaq4370-4", .data = &adaq4370_4_chip_info },
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{ .compatible = "adi,adaq4380-4", .data = &adaq4380_4_chip_info },
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{ }
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};
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@ -1203,6 +1323,8 @@ static const struct spi_device_id ad7380_id_table[] = {
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{ "ad7386-4", (kernel_ulong_t)&ad7386_4_chip_info },
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{ "ad7387-4", (kernel_ulong_t)&ad7387_4_chip_info },
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{ "ad7388-4", (kernel_ulong_t)&ad7388_4_chip_info },
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{ "adaq4370-4", (kernel_ulong_t)&adaq4370_4_chip_info },
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{ "adaq4380-4", (kernel_ulong_t)&adaq4380_4_chip_info },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, ad7380_id_table);
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