linux-kernel - [PATCH v2 5/8] iio: adc: ad7124: add sequencer support

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Date:   Fri, 18 Mar 2022 18:27:19 +0200
From:   <alexandru.tachici@...log.com>
To:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <jic23@...nel.org>,
        Alexandru Tachici <alexandru.tachici@...log.com>
Subject: [PATCH v2 5/8] iio: adc: ad7124: add sequencer support

From: Alexandru Tachici <alexandru.tachici@...log.com>

Add sequencer support for AD7124.

Signed-off-by: Alexandru Tachici <alexandru.tachici@...log.com>
---
 drivers/iio/adc/ad7124.c | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
index 428ec3e257d7..782b7cdd8ebe 100644
--- a/drivers/iio/adc/ad7124.c
+++ b/drivers/iio/adc/ad7124.c
@@ -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)
@@ -512,14 +514,27 @@ static int ad7124_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
 	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);
+
+	st->adc_control &= ~AD7124_ADC_STATUS_EN_MSK;
+	st->adc_control |= AD7124_ADC_STATUS_EN(append);
+
+	return ad_sd_write_reg(&st->sd, AD7124_ADC_CONTROL, 2, st->adc_control);
+}
+
 static const struct ad_sigma_delta_info ad7124_sigma_delta_info = {
 	.set_channel = ad7124_set_channel,
+	.append_status = ad7124_append_status,
 	.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,
@@ -679,10 +694,11 @@ static int ad7124_update_scan_mode(struct iio_dev *indio_dev,
 
 	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 (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)
 			return ret;
 	}
@@ -906,12 +922,14 @@ 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;
-- 
2.25.1