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Subject[RESEND PATCH V2] iio: adc: ad7124: Add direct reg access
Date
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>
---
drivers/iio/adc/ad7124.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
index 52f45b13da4a..38e67e08a79a 100644
--- a/drivers/iio/adc/ad7124.c
+++ b/drivers/iio/adc/ad7124.c
@@ -93,6 +93,14 @@ 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,
@@ -360,6 +368,25 @@ 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 (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");

@@ -375,6 +402,7 @@ 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,
};
--
2.17.1
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