Commit a878a1a6 authored by Antonio Fiol's avatar Antonio Fiol Committed by Jonathan Cameron
Browse files

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: default avatarAntonio Fiol <antonio@fiol.es>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 7253606d

drivers/iio/dac/Kconfig

+8 −3
Original line number Diff line number Diff line
@@ -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.

drivers/iio/dac/max517.c

+33 −12
Original line number Diff line number Diff line
@@ -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");

include/linux/iio/dac/max517.h

+1 −1
Original line number Diff line number Diff line
@@ -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_ */