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iio: adc: ad7124: Add direct reg access

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This patch adds the posibility do read and write registers from userspace
using the kernel debug direct register access option.

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 2020-02-11 10:44:53 +02:00 committed by Jonathan Cameron
parent 62504d1b44
commit 1d8690fe61
1 changed files with 30 additions and 0 deletions
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30
drivers/iio/adc/ad7124.c
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@ -98,6 +98,14 @@ static const unsigned int ad7124_gain[8] = {
1, 2, 4, 8, 16, 32, 64, 128
};
static const unsigned int ad7124_reg_size[] = {
1, 2, 3, 3, 2, 1, 3, 3, 1, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3
};
static const int ad7124_master_clk_freq_hz[3] = {
[AD7124_LOW_POWER] = 76800,
[AD7124_MID_POWER] = 153600,
@ -427,6 +435,27 @@ static int ad7124_write_raw(struct iio_dev *indio_dev,
}
}
static int ad7124_reg_access(struct iio_dev *indio_dev,
unsigned int reg,
unsigned int writeval,
unsigned int *readval)
{
struct ad7124_state *st = iio_priv(indio_dev);
int ret;
if (reg >= ARRAY_SIZE(ad7124_reg_size))
return -EINVAL;
if (readval)
ret = ad_sd_read_reg(&st->sd, reg, ad7124_reg_size[reg],
readval);
else
ret = ad_sd_write_reg(&st->sd, reg, ad7124_reg_size[reg],
writeval);
return ret;
}
static IIO_CONST_ATTR(in_voltage_scale_available,
"0.000001164 0.000002328 0.000004656 0.000009313 0.000018626 0.000037252 0.000074505 0.000149011 0.000298023");
@ -442,6 +471,7 @@ static const struct attribute_group ad7124_attrs_group = {
static const struct iio_info ad7124_info = {
.read_raw = ad7124_read_raw,
.write_raw = ad7124_write_raw,
.debugfs_reg_access = &ad7124_reg_access,
.validate_trigger = ad_sd_validate_trigger,
.attrs = &ad7124_attrs_group,
};