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IIO: DAC: AD5791: Add support for the AD5760/AD5780 High Resolution DACs 

Add support for the AD5760/AD5780 High Resolution Voltage Output DACs

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Hennerich 2011-04-27 17:13:58 +02:00 committed by Greg Kroah-Hartman
parent 62819fd948
commit ba1c2bb2cc
3 changed files with 50 additions and 20 deletions
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7
drivers/staging/iio/dac/Kconfig
View File

@ -32,11 +32,12 @@ config AD5504
module will be called ad5504.
config AD5791
tristate "Analog Devices AD5781/AD5791 DAC SPI driver"
tristate "Analog Devices AD5760/AD5780/AD5781/AD5791 DAC SPI driver"
depends on SPI
help
Say yes here to build support for Analog Devices AD5781, AD5791,
High Resolution Voltage Output Digital to Analog Converter.
Say yes here to build support for Analog Devices AD5760, AD5780,
AD5781, AD5791 High Resolution Voltage Output Digital to
Analog Converter.
To compile this driver as a module, choose M here: the
module will be called ad5791.

54
drivers/staging/iio/dac/ad5791.c
View File

@ -1,5 +1,5 @@
/*
* AD5791, AD5791 Voltage Output Digital to Analog Converter
* AD5760, AD5780, AD5781, AD5791 Voltage Output Digital to Analog Converter
*
* Copyright 2011 Analog Devices Inc.
*
@ -242,17 +242,6 @@ static const struct attribute_group ad5791_attribute_group = {
.attrs = ad5791_attributes,
};
static const struct ad5791_chip_info ad5791_chip_info_tbl[] = {
[ID_AD5791] = {
.bits = 20,
.left_shift = 0,
},
[ID_AD5781] = {
.bits = 18,
.left_shift = 2,
},
};
static int ad5791_get_lin_comp(unsigned int span)
{
if (span <= 10000)
@ -267,6 +256,37 @@ static int ad5791_get_lin_comp(unsigned int span)
return AD5791_LINCOMP_19_20;
}
static int ad5780_get_lin_comp(unsigned int span)
{
if (span <= 10000)
return AD5780_LINCOMP_0_10;
else
return AD5780_LINCOMP_10_20;
}
static const struct ad5791_chip_info ad5791_chip_info_tbl[] = {
[ID_AD5760] = {
.bits = 16,
.left_shift = 4,
.get_lin_comp = ad5780_get_lin_comp,
},
[ID_AD5780] = {
.bits = 18,
.left_shift = 2,
.get_lin_comp = ad5780_get_lin_comp,
},
[ID_AD5781] = {
.bits = 18,
.left_shift = 2,
.get_lin_comp = ad5791_get_lin_comp,
},
[ID_AD5791] = {
.bits = 20,
.left_shift = 0,
.get_lin_comp = ad5791_get_lin_comp,
},
};
static int __devinit ad5791_probe(struct spi_device *spi)
{
struct ad5791_platform_data *pdata = spi->dev.platform_data;
@ -314,8 +334,8 @@ static int __devinit ad5791_probe(struct spi_device *spi)
&ad5791_chip_info_tbl[spi_get_device_id(spi)->driver_data];
st->ctrl = AD5761_CTRL_LINCOMP(ad5791_get_lin_comp(st->vref_mv)) |
((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) |
st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv))
| ((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) |
AD5791_CTRL_BIN2SC;
ret = ad5791_spi_write(spi, AD5791_ADDR_CTRL, st->ctrl |
@ -386,8 +406,10 @@ static int __devexit ad5791_remove(struct spi_device *spi)
}
static const struct spi_device_id ad5791_id[] = {
{"ad5791", ID_AD5791},
{"ad5760", ID_AD5760},
{"ad5780", ID_AD5780},
{"ad5781", ID_AD5781},
{"ad5791", ID_AD5791},
{}
};
@ -414,5 +436,5 @@ static __exit void ad5791_spi_exit(void)
module_exit(ad5791_spi_exit);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD5791/AD5781 DAC");
MODULE_DESCRIPTION("Analog Devices AD5760/AD5780/AD5781/AD5791 DAC");
MODULE_LICENSE("GPL v2");

9
drivers/staging/iio/dac/ad5791.h
View File

@ -38,6 +38,9 @@
#define AD5791_LINCOMP_16_19 3
#define AD5791_LINCOMP_19_20 12
#define AD5780_LINCOMP_0_10 0
#define AD5780_LINCOMP_10_20 12
/* Software Control Register */
#define AD5791_SWCTRL_LDAC (1 << 0)
#define AD5791_SWCTRL_CLR (1 << 1)
@ -67,11 +70,13 @@ struct ad5791_platform_data {
* struct ad5791_chip_info - chip specific information
* @bits: accuracy of the DAC in bits
* @left_shift: number of bits the datum must be shifted
* @get_lin_comp: function pointer to the device specific function
*/
struct ad5791_chip_info {
u8 bits;
u8 left_shift;
int (*get_lin_comp) (unsigned int span);
};
/**
@ -102,8 +107,10 @@ struct ad5791_state {
*/
enum ad5791_supported_device_ids {
ID_AD5791,
ID_AD5760,
ID_AD5780,
ID_AD5781,
ID_AD5791,
};
#endif /* SPI_AD5791_H_ */