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Commit 4c337de8 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Jonathan Cameron
Browse files

iio:ad7476: Add ad7940 support 



The AD7940 is a single channel 14 bit ADC similar to the ADCs already supported
by the ad7476 driver, but it does have a different shift factor.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent ac5332b1

drivers/iio/adc/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -37,8 +37,8 @@ config AD7476 
	select IIO_TRIGGERED_BUFFER

	help

	  Say yes here to build support for Analog Devices AD7475, AD7476, AD7477,

	  AD7478, AD7466, AD7467, AD7468, AD7495, AD7910, AD7920 SPI analog to

	  digital converters (ADC).

	  AD7478, AD7466, AD7467, AD7468, AD7495, AD7910, AD7920, AD7920 SPI analog

	  to digital converters (ADC).



	  If unsure, say N (but it's safe to say "Y").

drivers/iio/adc/ad7476.c

+14 −4
Original line number Diff line number Diff line
@@ -48,7 +48,8 @@ enum ad7476_supported_device_ids { 
	ID_AD7466,

	ID_AD7467,

	ID_AD7468,

	ID_AD7495

	ID_AD7495,

	ID_AD7940,

};



static irqreturn_t ad7476_trigger_handler(int irq, void  *p)
@@ -126,7 +127,7 @@ static int ad7476_read_raw(struct iio_dev *indio_dev, 
	return -EINVAL;

}



#define AD7476_CHAN(bits)					\

#define _AD7476_CHAN(bits, _shift)				\

	{							\

	.type = IIO_VOLTAGE,					\

	.indexed = 1,						\
@@ -134,12 +135,16 @@ static int ad7476_read_raw(struct iio_dev *indio_dev, 
	IIO_CHAN_INFO_SCALE_SHARED_BIT,				\

	.scan_type = {						\

		.sign = 'u',					\

		.realbits = bits,				\

		.realbits = (bits),				\

		.storagebits = 16,				\

		.shift = 13 - bits,				\

		.shift = (_shift),				\

		.endianness = IIO_BE,				\

	},							\

}



#define AD7476_CHAN(bits) _AD7476_CHAN((bits), 13 - (bits))

#define AD7940_CHAN(bits) _AD7476_CHAN((bits), 15 - (bits))



static const struct ad7476_chip_info ad7476_chip_info_tbl[] = {

	[ID_AD7466] = {

		.channel[0] = AD7476_CHAN(12),
@@ -158,6 +163,10 @@ static const struct ad7476_chip_info ad7476_chip_info_tbl[] = { 
		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),

		.int_vref_uv = 2500000,

	},

	[ID_AD7940] = {

		.channel[0] = AD7940_CHAN(14),

		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),

	},

};



static const struct iio_info ad7476_info = {
@@ -260,6 +269,7 @@ static const struct spi_device_id ad7476_id[] = { 
	{"ad7495", ID_AD7495},

	{"ad7910", ID_AD7467},

	{"ad7920", ID_AD7466},

	{"ad7940", ID_AD7940},

	{}

};

MODULE_DEVICE_TABLE(spi, ad7476_id);