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Subject[PATCH] iio:adc:ad7923: Add support for the ad7908/ad7918/ad7928
Date
The ad7928 is software compatible with the ad7923. The ad7908 and ad7918 are the
8 and 10 bit version of the ad7928.

Signed-off-by: Daniel Junho <djunho@gmail.com>
---
drivers/iio/adc/Kconfig | 3 +-
drivers/iio/adc/ad7923.c | 96 +++++++++++++++++++++++++++++++---------
2 files changed, 78 insertions(+), 21 deletions(-)

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 976567d4dbef..40aa05fbf85e 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -205,7 +205,8 @@ config AD7923
select IIO_TRIGGERED_BUFFER
help
Say yes here to build support for Analog Devices
- AD7904, AD7914, AD7923, AD7924 4 Channel ADCs.
+ AD7904, AD7914, AD7923, AD7924 4 Channel ADCs, and
+ AD7908, AD7918, AD7928 8 Channels ADCs.

To compile this driver as a module, choose M here: the
module will be called ad7923.
diff --git a/drivers/iio/adc/ad7923.c b/drivers/iio/adc/ad7923.c
index 3212eb4c0f25..f08a5218dad1 100644
--- a/drivers/iio/adc/ad7923.c
+++ b/drivers/iio/adc/ad7923.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * AD7904/AD7914/AD7923/AD7924 SPI ADC driver
+ * AD7904/AD7914/AD7923/AD7924/AD7908/AD7918/AD7928 SPI ADC driver
*
* Copyright 2011 Analog Devices Inc (from AD7923 Driver)
* Copyright 2012 CS Systemes d'Information
@@ -26,23 +26,32 @@
#define AD7923_WRITE_CR BIT(11) /* write control register */
#define AD7923_RANGE BIT(1) /* range to REFin */
#define AD7923_CODING BIT(0) /* coding is straight binary */
+
#define AD7923_PM_MODE_AS (1) /* auto shutdown */
#define AD7923_PM_MODE_FS (2) /* full shutdown */
#define AD7923_PM_MODE_OPS (3) /* normal operation */
+
#define AD7923_CHANNEL_0 (0) /* analog input 0 */
#define AD7923_CHANNEL_1 (1) /* analog input 1 */
#define AD7923_CHANNEL_2 (2) /* analog input 2 */
#define AD7923_CHANNEL_3 (3) /* analog input 3 */
-#define AD7923_SEQUENCE_OFF (0) /* no sequence fonction */
-#define AD7923_SEQUENCE_PROTECT (2) /* no interrupt write cycle */
-#define AD7923_SEQUENCE_ON (3) /* continuous sequence */
-
-#define AD7923_MAX_CHAN 4
+#define AD7923_CHANNEL_4 (4) /* analog input 4 */
+#define AD7923_CHANNEL_5 (5) /* analog input 5 */
+#define AD7923_CHANNEL_6 (6) /* analog input 6 */
+#define AD7923_CHANNEL_7 (7) /* analog input 7 */
+
+#define AD7923_SEQUENCE_OFF (0x00) /* no sequence function */
+#define AD7923_SEQUENCE_SHADOW (0x01) /* use the shadow register
+ * for programming
+ * (only AD7908/7918/7928)
+ */
+#define AD7923_SEQUENCE_PROTECT (0x10) /* no interrupt write cycle */
+#define AD7923_SEQUENCE_ON (0x11) /* continuous sequence */

#define AD7923_PM_MODE_WRITE(mode) ((mode) << 4) /* write mode */
#define AD7923_CHANNEL_WRITE(channel) ((channel) << 6) /* write channel */
-#define AD7923_SEQUENCE_WRITE(sequence) ((((sequence) & 1) << 3) \
- + (((sequence) & 2) << 9))
+#define AD7923_SEQUENCE_WRITE(sequence) ((((sequence) & 0x01) << 3) \
+ + (((sequence) & 0x10) << 9))
/* write sequence fonction */
/* left shift for CR : bit 11 transmit in first */
#define AD7923_SHIFT_REGISTER 4
@@ -78,6 +87,9 @@ enum ad7923_id {
AD7904,
AD7914,
AD7924,
+ AD7908,
+ AD7918,
+ AD7928
};

#define AD7923_V_CHAN(index, bits) \
@@ -97,7 +109,7 @@ enum ad7923_id {
}, \
}

-#define DECLARE_AD7923_CHANNELS(name, bits) \
+#define DECLARE_AD7923_4CHANNELS(name, bits) \
const struct iio_chan_spec name ## _channels[] = { \
AD7923_V_CHAN(0, bits), \
AD7923_V_CHAN(1, bits), \
@@ -106,9 +118,25 @@ const struct iio_chan_spec name ## _channels[] = { \
IIO_CHAN_SOFT_TIMESTAMP(4), \
}

-static DECLARE_AD7923_CHANNELS(ad7904, 8);
-static DECLARE_AD7923_CHANNELS(ad7914, 10);
-static DECLARE_AD7923_CHANNELS(ad7924, 12);
+#define DECLARE_AD7923_8CHANNELS(name, bits) \
+const struct iio_chan_spec name ## _channels[] = { \
+ AD7923_V_CHAN(0, bits), \
+ AD7923_V_CHAN(1, bits), \
+ AD7923_V_CHAN(2, bits), \
+ AD7923_V_CHAN(3, bits), \
+ AD7923_V_CHAN(4, bits), \
+ AD7923_V_CHAN(5, bits), \
+ AD7923_V_CHAN(6, bits), \
+ AD7923_V_CHAN(7, bits), \
+ IIO_CHAN_SOFT_TIMESTAMP(8), \
+}
+
+static DECLARE_AD7923_4CHANNELS(ad7904, 8);
+static DECLARE_AD7923_4CHANNELS(ad7914, 10);
+static DECLARE_AD7923_4CHANNELS(ad7924, 12);
+static DECLARE_AD7923_8CHANNELS(ad7908, 8);
+static DECLARE_AD7923_8CHANNELS(ad7918, 10);
+static DECLARE_AD7923_8CHANNELS(ad7928, 12);

static const struct ad7923_chip_info ad7923_chip_info[] = {
[AD7904] = {
@@ -123,6 +151,18 @@ static const struct ad7923_chip_info ad7923_chip_info[] = {
.channels = ad7924_channels,
.num_channels = ARRAY_SIZE(ad7924_channels),
},
+ [AD7908] = {
+ .channels = ad7908_channels,
+ .num_channels = ARRAY_SIZE(ad7908_channels),
+ },
+ [AD7918] = {
+ .channels = ad7918_channels,
+ .num_channels = ARRAY_SIZE(ad7918_channels),
+ },
+ [AD7928] = {
+ .channels = ad7928_channels,
+ .num_channels = ARRAY_SIZE(ad7928_channels),
+ },
};

/**
@@ -135,10 +175,10 @@ static int ad7923_update_scan_mode(struct iio_dev *indio_dev,
int i, cmd, len;

len = 0;
- for_each_set_bit(i, active_scan_mask, AD7923_MAX_CHAN) {
+ for_each_set_bit(i, active_scan_mask, indio_dev->num_channels - 1) {
cmd = AD7923_WRITE_CR | AD7923_CHANNEL_WRITE(i) |
- AD7923_SEQUENCE_WRITE(AD7923_SEQUENCE_OFF) |
- st->settings;
+ AD7923_SEQUENCE_WRITE(AD7923_SEQUENCE_OFF) |
+ st->settings;
cmd <<= AD7923_SHIFT_REGISTER;
st->tx_buf[len++] = cpu_to_be16(cmd);
}
@@ -188,13 +228,13 @@ static irqreturn_t ad7923_trigger_handler(int irq, void *p)
return IRQ_HANDLED;
}

-static int ad7923_scan_direct(struct ad7923_state *st, unsigned ch)
+static int ad7923_scan_direct(struct ad7923_state *st, unsigned int ch)
{
int ret, cmd;

cmd = AD7923_WRITE_CR | AD7923_CHANNEL_WRITE(ch) |
- AD7923_SEQUENCE_WRITE(AD7923_SEQUENCE_OFF) |
- st->settings;
+ AD7923_SEQUENCE_WRITE(AD7923_SEQUENCE_OFF) |
+ st->settings;
cmd <<= AD7923_SHIFT_REGISTER;
st->tx_buf[0] = cpu_to_be16(cmd);

@@ -280,7 +320,7 @@ static int ad7923_probe(struct spi_device *spi)

st->spi = spi;
st->settings = AD7923_CODING | AD7923_RANGE |
- AD7923_PM_MODE_WRITE(AD7923_PM_MODE_OPS);
+ AD7923_PM_MODE_WRITE(AD7923_PM_MODE_OPS);

info = &ad7923_chip_info[spi_get_device_id(spi)->driver_data];

@@ -348,13 +388,29 @@ static const struct spi_device_id ad7923_id[] = {
{"ad7914", AD7914},
{"ad7923", AD7924},
{"ad7924", AD7924},
+ {"ad7908", AD7908},
+ {"ad7918", AD7918},
+ {"ad7928", AD7928},
{}
};
MODULE_DEVICE_TABLE(spi, ad7923_id);

+static const struct of_device_id ad7923_of_match[] = {
+ { .compatible = "adi,ad7904", },
+ { .compatible = "adi,ad7914", },
+ { .compatible = "adi,ad7923", },
+ { .compatible = "adi,ad7924", },
+ { .compatible = "adi,ad7908", },
+ { .compatible = "adi,ad7918", },
+ { .compatible = "adi,ad7928", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ad7923_of_match);
+
static struct spi_driver ad7923_driver = {
.driver = {
.name = "ad7923",
+ .of_match_table = ad7923_of_match,
},
.probe = ad7923_probe,
.remove = ad7923_remove,
@@ -364,5 +420,5 @@ module_spi_driver(ad7923_driver);

MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_AUTHOR("Patrick Vasseur <patrick.vasseur@c-s.fr>");
-MODULE_DESCRIPTION("Analog Devices AD7904/AD7914/AD7923/AD7924 ADC");
+MODULE_DESCRIPTION("Analog Devices AD7904/AD7914/AD7923/AD7924/AD7908/AD7918/AD7928 ADC");
MODULE_LICENSE("GPL v2");
--
2.24.0
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