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iio: max517: Add support for MAX520 and MAX521 chips.

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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>
This commit is contained in:
Antonio Fiol 2015-03-28 09:07:14 +01:00 committed by Jonathan Cameron
parent 7253606d38
commit a878a1a61a
3 changed files with 42 additions and 16 deletions
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11
drivers/iio/dac/Kconfig
View File

@ -143,11 +143,16 @@ config AD7303
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.

45
drivers/iio/dac/max517.c
View File

@ -39,11 +39,13 @@ enum max517_device_ids {
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_info max517_info = {
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 @@ static int max517_probe(struct i2c_client *client,
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 @@ static int max517_probe(struct i2c_client *client,
/* 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 @@ static int max517_probe(struct i2c_client *client,
* 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 @@ static const struct i2c_device_id max517_id[] = {
{ "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 @@ static struct i2c_driver max517_driver = {
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");

2
include/linux/iio/dac/max517.h
View File

@ -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_ */