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authorMircea Caprioru <mircea.caprioru@analog.com>2020-02-11 10:44:53 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2020-03-08 17:28:31 +0000
commit1d8690fe61c9e83a59b74a223ab94de3f889bc74 (patch)
tree03b425dec8f3f5c9766e31938fb7927b756889b3 /drivers/iio/adc
parent62504d1b44ecc58bcf4aa8455e94f8ea1c5b823f (diff)
downloadlinux-1d8690fe61c9e83a59b74a223ab94de3f889bc74.tar.gz
iio: adc: ad7124: Add direct reg access
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>
Diffstat (limited to 'drivers/iio/adc')
-rw-r--r--drivers/iio/adc/ad7124.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
index f0206d819fda..a3c0647a5391 100644
--- a/drivers/iio/adc/ad7124.c
+++ b/drivers/iio/adc/ad7124.c
@@ -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,
};