iio: max517: Add support for MAX520 and MAX521 chips.
MAX520 and MAX521 are protocol-compatible with the already supported
chips, just have more channels.
Signed-off-by: Antonio Fiol <antonio@fiol.es>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index 2236ea2..13471a7 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -143,11 +143,16 @@
ad7303.
config MAX517
- tristate "Maxim MAX517/518/519 DAC driver"
+ tristate "Maxim MAX517/518/519/520/521 DAC driver"
depends on I2C
help
- If you say yes here you get support for the Maxim chips MAX517,
- MAX518 and MAX519 (I2C 8-Bit DACs with rail-to-rail outputs).
+ If you say yes here you get support for the following Maxim chips
+ (I2C 8-Bit DACs with rail-to-rail outputs):
+ MAX517 - Single channel, single reference
+ MAX518 - Dual channel, ref=Vdd
+ MAX519 - Dual channel, dual reference
+ MAX520 - Quad channel, quad reference
+ MAX521 - Octal channel, independent ref for ch0-3, shared ref for ch4-7
This driver can also be built as a module. If so, the module
will be called max517.
diff --git a/drivers/iio/dac/max517.c b/drivers/iio/dac/max517.c
index 9a82a72..5507b39 100644
--- a/drivers/iio/dac/max517.c
+++ b/drivers/iio/dac/max517.c
@@ -39,11 +39,13 @@
ID_MAX517,
ID_MAX518,
ID_MAX519,
+ ID_MAX520,
+ ID_MAX521,
};
struct max517_data {
struct i2c_client *client;
- unsigned short vref_mv[2];
+ unsigned short vref_mv[8];
};
/*
@@ -149,7 +151,13 @@
static const struct iio_chan_spec max517_channels[] = {
MAX517_CHANNEL(0),
- MAX517_CHANNEL(1)
+ MAX517_CHANNEL(1),
+ MAX517_CHANNEL(2),
+ MAX517_CHANNEL(3),
+ MAX517_CHANNEL(4),
+ MAX517_CHANNEL(5),
+ MAX517_CHANNEL(6),
+ MAX517_CHANNEL(7),
};
static int max517_probe(struct i2c_client *client,
@@ -158,6 +166,7 @@
struct max517_data *data;
struct iio_dev *indio_dev;
struct max517_platform_data *platform_data = client->dev.platform_data;
+ int chan;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
@@ -169,11 +178,21 @@
/* establish that the iio_dev is a child of the i2c device */
indio_dev->dev.parent = &client->dev;
- /* reduced channel set for MAX517 */
- if (id->driver_data == ID_MAX517)
- indio_dev->num_channels = 1;
- else
+ switch (id->driver_data) {
+ case ID_MAX521:
+ indio_dev->num_channels = 8;
+ break;
+ case ID_MAX520:
+ indio_dev->num_channels = 4;
+ break;
+ case ID_MAX519:
+ case ID_MAX518:
indio_dev->num_channels = 2;
+ break;
+ default: /* single channel for MAX517 */
+ indio_dev->num_channels = 1;
+ break;
+ }
indio_dev->channels = max517_channels;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &max517_info;
@@ -182,11 +201,11 @@
* Reference voltage on MAX518 and default is 5V, else take vref_mv
* from platform_data
*/
- if (id->driver_data == ID_MAX518 || !platform_data) {
- data->vref_mv[0] = data->vref_mv[1] = 5000; /* mV */
- } else {
- data->vref_mv[0] = platform_data->vref_mv[0];
- data->vref_mv[1] = platform_data->vref_mv[1];
+ for (chan = 0; chan < indio_dev->num_channels; chan++) {
+ if (id->driver_data == ID_MAX518 || !platform_data)
+ data->vref_mv[chan] = 5000; /* mV */
+ else
+ data->vref_mv[chan] = platform_data->vref_mv[chan];
}
return iio_device_register(indio_dev);
@@ -202,6 +221,8 @@
{ "max517", ID_MAX517 },
{ "max518", ID_MAX518 },
{ "max519", ID_MAX519 },
+ { "max520", ID_MAX520 },
+ { "max521", ID_MAX521 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max517_id);
@@ -218,5 +239,5 @@
module_i2c_driver(max517_driver);
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
-MODULE_DESCRIPTION("MAX517/MAX518/MAX519 8-bit DAC");
+MODULE_DESCRIPTION("MAX517/518/519/520/521 8-bit DAC");
MODULE_LICENSE("GPL");
diff --git a/include/linux/iio/dac/max517.h b/include/linux/iio/dac/max517.h
index f6d1d25..7668716 100644
--- a/include/linux/iio/dac/max517.h
+++ b/include/linux/iio/dac/max517.h
@@ -9,7 +9,7 @@
#define IIO_DAC_MAX517_H_
struct max517_platform_data {
- u16 vref_mv[2];
+ u16 vref_mv[8];
};
#endif /* IIO_DAC_MAX517_H_ */
