iio: adc: ad7923: Add support for the ad7908/ad7918/ad7928

The ad7928 is software compatible with the ad7923.
The ad7908 and ad7918 are the 8 and 10-bit versions of the ad7928.

Signed-off-by: Daniel Junho <djunho@gmail.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad7923.c b/drivers/iio/adc/ad7923.c
index 6d56fa0..1d124c8 100644 (file)
--- 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
@@ -33,7 +33,6 @@
 #define AD7923_SEQUENCE_PROTECT        (2)             /* no interrupt write cycle */
 #define AD7923_SEQUENCE_ON     (3)             /* continuous sequence */
 
-#define AD7923_MAX_CHAN                4
 
 #define AD7923_PM_MODE_WRITE(mode)     ((mode) << 4)    /* write mode */
 #define AD7923_CHANNEL_WRITE(channel)  ((channel) << 6) /* write channel */
@@ -74,6 +73,9 @@ enum ad7923_id {
        AD7904,
        AD7914,
        AD7924,
+       AD7908,
+       AD7918,
+       AD7928
 };
 
 #define AD7923_V_CHAN(index, bits)                                     \
@@ -102,9 +104,25 @@ const struct iio_chan_spec name ## _channels[] = { \
        IIO_CHAN_SOFT_TIMESTAMP(4), \
 }
 
+#define DECLARE_AD7908_CHANNELS(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_CHANNELS(ad7904, 8);
 static DECLARE_AD7923_CHANNELS(ad7914, 10);
 static DECLARE_AD7923_CHANNELS(ad7924, 12);
+static DECLARE_AD7908_CHANNELS(ad7908, 8);
+static DECLARE_AD7908_CHANNELS(ad7918, 10);
+static DECLARE_AD7908_CHANNELS(ad7928, 12);
 
 static const struct ad7923_chip_info ad7923_chip_info[] = {
        [AD7904] = {
@@ -119,6 +137,18 @@ 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),
+       },
 };
 
 /**
@@ -131,7 +161,11 @@ 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 this driver the last channel is always the software timestamp so
+        * skip that one.
+        */
+       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;
@@ -344,6 +378,9 @@ 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);
@@ -353,6 +390,9 @@ static const struct of_device_id ad7923_of_match[] = {
        { .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);
@@ -370,5 +410,5 @@ 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 AD7923 and similar ADC");
 MODULE_LICENSE("GPL v2");