staging:iio:ad7793: Add support for ad7794/ad7795

The ad7794/ad7795 are similar to the ad7792/ad7793, but have 6 channels instead
of 3.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

3 files changed, 66 insertions, 31 deletions

diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig
index 3f1f2c341dff..0eab0c61c87b 100644
--- a/drivers/staging/iio/adc/Kconfig
+++ b/drivers/staging/iio/adc/Kconfig
@@ -109,12 +109,12 @@ config AD7780
           module will be called ad7780.
 
 config AD7793
-        tristate "Analog Devices AD7792 AD7793 ADC driver"
+        tristate "Analog Devices AD7793 and similar ADCs driver"
         depends on SPI
         select AD_SIGMA_DELTA
         help
-          Say yes here to build support for Analog Devices
-          AD7792 and AD7793 SPI analog to digital converters (ADC).
+          Say yes here to build support for Analog Devices AD7792, AD7793, AD7794
+          and AD7795 SPI analog to digital converters (ADC).
           If unsure, say N (but it's safe to say "Y").
 
           To compile this driver as a module, choose M here: the
diff --git a/drivers/staging/iio/adc/ad7793.c b/drivers/staging/iio/adc/ad7793.c
index 90335958d9c9..f11dcaf0fbae 100644
--- a/drivers/staging/iio/adc/ad7793.c
+++ b/drivers/staging/iio/adc/ad7793.c
@@ -1,5 +1,5 @@
 /*
- * AD7792/AD7793 SPI ADC driver
+ * AD7792/AD7793/AD7794/AD7795 SPI ADC driver
  *
  * Copyright 2011-2012 Analog Devices Inc.
  *
@@ -37,7 +37,8 @@
  */
 
 struct ad7793_chip_info {
-        struct iio_chan_spec    channel[7];
+        const struct iio_chan_spec *channels;
+        unsigned int num_channels;
 };
 
 struct ad7793_state {
@@ -55,6 +56,8 @@ struct ad7793_state {
 enum ad7793_supported_device_ids {
         ID_AD7792,
         ID_AD7793,
+        ID_AD7794,
+        ID_AD7795,
 };
 
 static struct ad7793_state *ad_sigma_delta_to_ad7793(struct ad_sigma_delta *sd)
@@ -127,7 +130,7 @@ static int ad7793_setup(struct iio_dev *indio_dev,
 
         id &= AD7793_ID_MASK;
 
-        if (!((id == AD7792_ID) || (id == AD7793_ID))) {
+        if (!((id == AD7792_ID) || (id == AD7793_ID) || (id == AD7795_ID))) {
                 dev_err(&st->sd.spi->dev, "device ID query failed\n");
                 goto out;
         }
@@ -155,7 +158,7 @@ static int ad7793_setup(struct iio_dev *indio_dev,
         /* Populate available ADC input ranges */
         for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) {
                 scale_uv = ((u64)st->int_vref_mv * 100000000)
-                        >> (st->chip_info->channel[0].scan_type.realbits -
+                        >> (st->chip_info->channels[0].scan_type.realbits -
                         (!!(st->conf & AD7793_CONF_UNIPOLAR) ? 0 : 1));
                 scale_uv >>= i;
 
@@ -383,28 +386,52 @@ static const struct iio_info ad7793_info = {
         .driver_module = THIS_MODULE,
 };
 
+#define DECLARE_AD7793_CHANNELS(_name, _b, _sb) \
+const struct iio_chan_spec _name##_channels[] = { \
+        AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
+        AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \
+        AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \
+        AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
+        AD_SD_TEMP_CHANNEL(4, AD7793_CH_TEMP, (_b), (_sb), 0), \
+        AD_SD_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
+        IIO_CHAN_SOFT_TIMESTAMP(6), \
+}
+
+#define DECLARE_AD7795_CHANNELS(_name, _b, _sb) \
+const struct iio_chan_spec _name##_channels[] = { \
+        AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
+        AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \
+        AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \
+        AD_SD_DIFF_CHANNEL(3, 3, 3, AD7795_CH_AIN4P_AIN4M, (_b), (_sb), 0), \
+        AD_SD_DIFF_CHANNEL(4, 4, 4, AD7795_CH_AIN5P_AIN5M, (_b), (_sb), 0), \
+        AD_SD_DIFF_CHANNEL(5, 5, 5, AD7795_CH_AIN6P_AIN6M, (_b), (_sb), 0), \
+        AD_SD_SHORTED_CHANNEL(6, 0, AD7795_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
+        AD_SD_TEMP_CHANNEL(7, AD7793_CH_TEMP, (_b), (_sb), 0), \
+        AD_SD_SUPPLY_CHANNEL(8, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
+        IIO_CHAN_SOFT_TIMESTAMP(9), \
+}
+
+static DECLARE_AD7793_CHANNELS(ad7792, 16, 32);
+static DECLARE_AD7793_CHANNELS(ad7793, 24, 32);
+static DECLARE_AD7795_CHANNELS(ad7794, 16, 32);
+static DECLARE_AD7795_CHANNELS(ad7795, 24, 32);
+
 static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
+        [ID_AD7792] = {
+                .channels = ad7792_channels,
+                .num_channels = ARRAY_SIZE(ad7792_channels),
+        },
         [ID_AD7793] = {
-                .channel = {
-                        AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, 24, 32, 0),
-                        AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, 24, 32, 0),
-                        AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, 24, 32, 0),
-                        AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, 24, 32, 0),
-                        AD_SD_TEMP_CHANNEL(4, AD7793_CH_TEMP, 24, 32, 0),
-                        AD_SD_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, 24, 32, 0),
-                        IIO_CHAN_SOFT_TIMESTAMP(6),
-                },
+                .channels = ad7793_channels,
+                .num_channels = ARRAY_SIZE(ad7793_channels),
         },
-        [ID_AD7792] = {
-                .channel = {
-                        AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, 16, 32, 0),
-                        AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, 16, 32, 0),
-                        AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, 16, 32, 0),
-                        AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, 16, 32, 0),
-                        AD_SD_TEMP_CHANNEL(4, AD7793_CH_TEMP, 16, 32, 0),
-                        AD_SD_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, 16, 32, 0),
-                        IIO_CHAN_SOFT_TIMESTAMP(6),
-                },
+        [ID_AD7794] = {
+                .channels = ad7794_channels,
+                .num_channels = ARRAY_SIZE(ad7794_channels),
+        },
+        [ID_AD7795] = {
+                .channels = ad7795_channels,
+                .num_channels = ARRAY_SIZE(ad7795_channels),
         },
 };
 
@@ -457,8 +484,8 @@ static int __devinit ad7793_probe(struct spi_device *spi)
         indio_dev->dev.parent = &spi->dev;
         indio_dev->name = spi_get_device_id(spi)->name;
         indio_dev->modes = INDIO_DIRECT_MODE;
-        indio_dev->channels = st->chip_info->channel;
-        indio_dev->num_channels = 7;
+        indio_dev->channels = st->chip_info->channels;
+        indio_dev->num_channels = st->chip_info->num_channels;
         indio_dev->info = &ad7793_info;
 
         ret = ad_sd_setup_buffer_and_trigger(indio_dev);
@@ -510,6 +537,8 @@ static int ad7793_remove(struct spi_device *spi)
 static const struct spi_device_id ad7793_id[] = {
         {"ad7792", ID_AD7792},
         {"ad7793", ID_AD7793},
+        {"ad7794", ID_AD7794},
+        {"ad7795", ID_AD7795},
         {}
 };
 MODULE_DEVICE_TABLE(spi, ad7793_id);
@@ -526,5 +555,5 @@ static struct spi_driver ad7793_driver = {
 module_spi_driver(ad7793_driver);
 
 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
-MODULE_DESCRIPTION("Analog Devices AD7792/3 ADC");
+MODULE_DESCRIPTION("Analog Devices AD7793 and simialr ADCs");
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/staging/iio/adc/ad7793.h b/drivers/staging/iio/adc/ad7793.h
index 0e296d88412b..8fdd450a2cd9 100644
--- a/drivers/staging/iio/adc/ad7793.h
+++ b/drivers/staging/iio/adc/ad7793.h
@@ -70,8 +70,8 @@
 #define AD7793_CONF_GAIN(x)     (((x) & 0x7) << 8) /* Gain Select */
 #define AD7793_CONF_REFSEL      (1 << 7) /* INT/EXT Reference Select */
 #define AD7793_CONF_BUF         (1 << 4) /* Buffered Mode Enable */
-#define AD7793_CONF_CHAN(x)     ((x) & 0x7) /* Channel select */
-#define AD7793_CONF_CHAN_MASK   0x7 /* Channel select mask */
+#define AD7793_CONF_CHAN(x)     ((x) & 0xf) /* Channel select */
+#define AD7793_CONF_CHAN_MASK   0xf /* Channel select mask */
 
 #define AD7793_CH_AIN1P_AIN1M   0 /* AIN1(+) - AIN1(-) */
 #define AD7793_CH_AIN2P_AIN2M   1 /* AIN2(+) - AIN2(-) */
@@ -80,9 +80,15 @@
 #define AD7793_CH_TEMP          6 /* Temp Sensor */
 #define AD7793_CH_AVDD_MONITOR  7 /* AVDD Monitor */
 
+#define AD7795_CH_AIN4P_AIN4M   4 /* AIN4(+) - AIN4(-) */
+#define AD7795_CH_AIN5P_AIN5M   5 /* AIN5(+) - AIN5(-) */
+#define AD7795_CH_AIN6P_AIN6M   6 /* AIN6(+) - AIN6(-) */
+#define AD7795_CH_AIN1M_AIN1M   8 /* AIN1(-) - AIN1(-) */
+
 /* ID Register Bit Designations (AD7793_REG_ID) */
 #define AD7792_ID               0xA
 #define AD7793_ID               0xB
+#define AD7795_ID               0xF
 #define AD7793_ID_MASK          0xF
 
 /* IO (Excitation Current Sources) Register Bit Designations (AD7793_REG_IO) */