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staging: iio: adc: ad7192: Add system calibration support 

This patch will add a system calibration attribute for each channel. Using
this option the user will have the ability to calibrate each channel for
zero scale and full scale. It uses the iio_chan_spec_ext_info and IIO_ENUM
to implement the functionality.

Signed-off-by: Mircea Caprioru <mircea.caprioru@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Mircea Caprioru 2019-09-02 16:08:30 +03:00 committed by Jonathan Cameron
parent c88c8cd826
commit 42776c14c6
2 changed files with 102 additions and 1 deletions
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24
Documentation/ABI/testing/sysfs-bus-iio-adc-ad7192
View File

@ -13,3 +13,27 @@ Description:
need to minimize the system current consumption.
Reading gives the state of the bridge switch.
Writing '1' enables the bridge switch.
What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration
KernelVersion:
Contact: linux-iio@vger.kernel.org
Description:
Initiates the system calibration procedure. This is done on a
single channel at a time. Write '1' to start the calibration.
What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration_mode_available
KernelVersion:
Contact: linux-iio@vger.kernel.org
Description:
Reading returns a list with the possible calibration modes.
There are two available options:
"zero_scale" - calibrate to zero scale
"full_scale" - calibrate to full scale
What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration_mode
KernelVersion:
Contact: linux-iio@vger.kernel.org
Description:
Sets up the calibration mode used in the system calibration
procedure. Reading returns the current calibration mode.
Writing sets the system calibration mode.

79
drivers/staging/iio/adc/ad7192.c
View File

@ -155,6 +155,11 @@
* The DOUT/RDY output must also be wired to an interrupt capable GPIO.
*/
enum {
AD7192_SYSCALIB_ZERO_SCALE,
AD7192_SYSCALIB_FULL_SCALE,
};
struct ad7192_state {
struct regulator *avdd;
struct regulator *dvdd;
@ -169,10 +174,80 @@ struct ad7192_state {
u8 devid;
u8 clock_sel;
struct mutex lock; /* protect sensor state */
u8 syscalib_mode[8];
struct ad_sigma_delta sd;
};
static const char * const ad7192_syscalib_modes[] = {
[AD7192_SYSCALIB_ZERO_SCALE] = "zero_scale",
[AD7192_SYSCALIB_FULL_SCALE] = "full_scale",
};
static int ad7192_set_syscalib_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
unsigned int mode)
{
struct ad7192_state *st = iio_priv(indio_dev);
st->syscalib_mode[chan->channel] = mode;
return 0;
}
static int ad7192_get_syscalib_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct ad7192_state *st = iio_priv(indio_dev);
return st->syscalib_mode[chan->channel];
}
static ssize_t ad7192_write_syscalib(struct iio_dev *indio_dev,
uintptr_t private,
const struct iio_chan_spec *chan,
const char *buf, size_t len)
{
struct ad7192_state *st = iio_priv(indio_dev);
bool sys_calib;
int ret, temp;
ret = strtobool(buf, &sys_calib);
if (ret)
return ret;
temp = st->syscalib_mode[chan->channel];
if (sys_calib) {
if (temp == AD7192_SYSCALIB_ZERO_SCALE)
ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_ZERO,
chan->address);
else
ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_FULL,
chan->address);
}
return ret ? ret : len;
}
static const struct iio_enum ad7192_syscalib_mode_enum = {
.items = ad7192_syscalib_modes,
.num_items = ARRAY_SIZE(ad7192_syscalib_modes),
.set = ad7192_set_syscalib_mode,
.get = ad7192_get_syscalib_mode
};
static const struct iio_chan_spec_ext_info ad7192_calibsys_ext_info[] = {
{
.name = "sys_calibration",
.write = ad7192_write_syscalib,
.shared = IIO_SEPARATE,
},
IIO_ENUM("sys_calibration_mode", IIO_SEPARATE,
&ad7192_syscalib_mode_enum),
IIO_ENUM_AVAILABLE("sys_calibration_mode", &ad7192_syscalib_mode_enum),
{}
};
static struct ad7192_state *ad_sigma_delta_to_ad7192(struct ad_sigma_delta *sd)
{
return container_of(sd, struct ad7192_state, sd);
@ -770,9 +845,11 @@ static int ad7192_channels_config(struct iio_dev *indio_dev)
*chan = channels[i];
chan->info_mask_shared_by_all |=
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY);
if (chan->type != IIO_TEMP)
if (chan->type != IIO_TEMP) {
chan->info_mask_shared_by_type_available |=
BIT(IIO_CHAN_INFO_SCALE);
chan->ext_info = ad7192_calibsys_ext_info;
}
chan++;
}