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staging:iio:ad7780: Add support for the ad7170/ad7171 

The ad7170/ad7171 have a software interface similar to the ad7780. They do not
have an external pin which allows to change the internal gain and the what is
used for the gain bit in the ad7780/ad7781 becomes part of the check pattern.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2012-09-21 14:29:00 +01:00 committed by Jonathan Cameron
parent 332ed63ee9
commit 7aecec986e
2 changed files with 32 additions and 8 deletions
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4
drivers/staging/iio/adc/Kconfig
View File

@ -82,12 +82,12 @@ config AD7887
module will be called ad7887. module will be called ad7887.
config AD7780 config AD7780
tristate "Analog Devices AD7780 AD7781 ADC driver" tristate "Analog Devices AD7780 and similar ADCs driver"
depends on SPI depends on SPI
depends on GPIOLIB depends on GPIOLIB
select AD_SIGMA_DELTA select AD_SIGMA_DELTA
help help
Say yes here to build support for Analog Devices Say yes here to build support for Analog Devices AD7170, AD7171,
AD7780 and AD7781 SPI analog to digital converters (ADC). AD7780 and AD7781 SPI analog to digital converters (ADC).
If unsure, say N (but it's safe to say "Y"). If unsure, say N (but it's safe to say "Y").

36
drivers/staging/iio/adc/ad7780.c
View File

@ -1,5 +1,5 @@
/* /*
* AD7780/AD7781 SPI ADC driver * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver
* *
* Copyright 2011 Analog Devices Inc. * Copyright 2011 Analog Devices Inc.
* *
@ -34,7 +34,9 @@
#define AD7780_PAT0 (1 << 0) #define AD7780_PAT0 (1 << 0)
struct ad7780_chip_info { struct ad7780_chip_info {
struct iio_chan_spec channel; struct iio_chan_spec channel;
unsigned int pattern_mask;
unsigned int pattern;
}; };
struct ad7780_state { struct ad7780_state {
@ -48,6 +50,8 @@ struct ad7780_state {
}; };
enum ad7780_supported_device_ids { enum ad7780_supported_device_ids {
ID_AD7170,
ID_AD7171,
ID_AD7780, ID_AD7780,
ID_AD7781, ID_AD7781,
}; };
@ -109,9 +113,10 @@ static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta,
unsigned int raw_sample) unsigned int raw_sample)
{ {
struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta);
const struct ad7780_chip_info *chip_info = st->chip_info;
if ((raw_sample & AD7780_ERR) || if ((raw_sample & AD7780_ERR) ||
!((raw_sample & AD7780_PAT0) && !(raw_sample & AD7780_PAT1))) ((raw_sample & chip_info->pattern_mask) != chip_info->pattern))
return -EIO; return -EIO;
if (raw_sample & AD7780_GAIN) if (raw_sample & AD7780_GAIN)
@ -128,12 +133,29 @@ static const struct ad_sigma_delta_info ad7780_sigma_delta_info = {
.has_registers = false, .has_registers = false,
}; };
#define AD7780_CHANNEL(bits, wordsize) \
AD_SD_CHANNEL(1, 0, 0, bits, 32, wordsize - bits)
static const struct ad7780_chip_info ad7780_chip_info_tbl[] = { static const struct ad7780_chip_info ad7780_chip_info_tbl[] = {
[ID_AD7170] = {
.channel = AD7780_CHANNEL(12, 24),
.pattern = 0x5,
.pattern_mask = 0x7,
},
[ID_AD7171] = {
.channel = AD7780_CHANNEL(16, 24),
.pattern = 0x5,
.pattern_mask = 0x7,
},
[ID_AD7780] = { [ID_AD7780] = {
.channel = AD_SD_CHANNEL(1, 0, 0, 24, 32, 8), .channel = AD7780_CHANNEL(24, 32),
.pattern = 0x1,
.pattern_mask = 0x3,
}, },
[ID_AD7781] = { [ID_AD7781] = {
.channel = AD_SD_CHANNEL(1, 0, 0, 20, 32, 12), .channel = AD7780_CHANNEL(20, 32),
.pattern = 0x1,
.pattern_mask = 0x3,
}, },
}; };
@ -247,6 +269,8 @@ static int __devexit ad7780_remove(struct spi_device *spi)
} }
static const struct spi_device_id ad7780_id[] = { static const struct spi_device_id ad7780_id[] = {
{"ad7170", ID_AD7170},
{"ad7171", ID_AD7171},
{"ad7780", ID_AD7780}, {"ad7780", ID_AD7780},
{"ad7781", ID_AD7781}, {"ad7781", ID_AD7781},
{} {}
@ -265,5 +289,5 @@ static struct spi_driver ad7780_driver = {
module_spi_driver(ad7780_driver); module_spi_driver(ad7780_driver);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD7780/1 ADC"); MODULE_DESCRIPTION("Analog Devices AD7780 and similar ADCs");
MODULE_LICENSE("GPL v2"); MODULE_LICENSE("GPL v2");