[PATCH v8 5/6] iio: core: Add support for writing 64 bit attrs

Sam Winchenbach
2025-03-28T17:50:16Z

Prior to this patch it was only possible to read 64 bit integers.

Signed-off-by: Sam Winchenbach <swinchenbach@arka.org>
---
drivers/iio/industrialio-core.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index a2117ad1337d5..b2436b8f3eeae 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -965,8 +965,10 @@ static ssize_t iio_write_channel_info(struct device *dev,
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret, fract_mult = 100000;
int integer, fract = 0;
+ long long integer64;
bool is_char = false;
bool scale_db = false;
+ bool is_64bit = false;

/* Assumes decimal - precision based on number of digits */
if (!indio_dev->info->write_raw)
@@ -990,6 +992,9 @@ static ssize_t iio_write_channel_info(struct device *dev,
case IIO_VAL_CHAR:
is_char = true;
break;
+ case IIO_VAL_INT_64:
+ is_64bit = true;
+ break;
default:
return -EINVAL;
}
@@ -1000,6 +1005,13 @@ static ssize_t iio_write_channel_info(struct device *dev,
if (sscanf(buf, "%c", &ch) != 1)
return -EINVAL;
integer = ch;
+ } else if (is_64bit) {
+ ret = kstrtoll(buf, 0, &integer64);
+ if (ret)
+ return ret;
+
+ fract = (int)(integer64 >> 32);
+ integer = (int)(integer64 & 0xFFFFFFFF);
} else {
ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
scale_db);
--
2.49.0