iio: dac: mcp4922: add support to mcp4921

Add support to mcp4921 which has only one output channel.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20220624095619.1415614-1-kory.maincent@bootlin.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/dac/mcp4922.c b/drivers/iio/dac/mcp4922.c
index 6c0e310..da43276 100644 (file)
--- a/drivers/iio/dac/mcp4922.c
+++ b/drivers/iio/dac/mcp4922.c
@@ -17,10 +17,12 @@
 #include <linux/bitops.h>
 
 #define MCP4922_NUM_CHANNELS   2
+#define MCP4921_NUM_CHANNELS   1
 
 enum mcp4922_supported_device_ids {
        ID_MCP4902,
        ID_MCP4912,
+       ID_MCP4921,
        ID_MCP4922,
 };
 
@@ -105,9 +107,10 @@ static int mcp4922_write_raw(struct iio_dev *indio_dev,
        }
 }
 
-static const struct iio_chan_spec mcp4922_channels[3][MCP4922_NUM_CHANNELS] = {
+static const struct iio_chan_spec mcp4922_channels[4][MCP4922_NUM_CHANNELS] = {
        [ID_MCP4902] = { MCP4922_CHAN(0, 8),    MCP4922_CHAN(1, 8) },
        [ID_MCP4912] = { MCP4922_CHAN(0, 10),   MCP4922_CHAN(1, 10) },
+       [ID_MCP4921] = { MCP4922_CHAN(0, 12),   {} },
        [ID_MCP4922] = { MCP4922_CHAN(0, 12),   MCP4922_CHAN(1, 12) },
 };
 
@@ -154,7 +157,10 @@ static int mcp4922_probe(struct spi_device *spi)
        indio_dev->info = &mcp4922_info;
        indio_dev->modes = INDIO_DIRECT_MODE;
        indio_dev->channels = mcp4922_channels[id->driver_data];
-       indio_dev->num_channels = MCP4922_NUM_CHANNELS;
+       if (id->driver_data == ID_MCP4921)
+               indio_dev->num_channels = MCP4921_NUM_CHANNELS;
+       else
+               indio_dev->num_channels = MCP4922_NUM_CHANNELS;
        indio_dev->name = id->name;
 
        ret = iio_device_register(indio_dev);
@@ -185,6 +191,7 @@ static void mcp4922_remove(struct spi_device *spi)
 static const struct spi_device_id mcp4922_id[] = {
        {"mcp4902", ID_MCP4902},
        {"mcp4912", ID_MCP4912},
+       {"mcp4921", ID_MCP4921},
        {"mcp4922", ID_MCP4922},
        {}
 };