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iio: core: Add support for writing 64 bit attrs

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

Signed-off-by: Sam Winchenbach <swinchenbach@arka.org>
Link: https://patch.msgid.link/20250328174831.227202-6-sam.winchenbach@framepointer.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Sam Winchenbach
2025-03-28 13:48:30 -04:00
committed by Jonathan Cameron
parent d542db7095
commit c31752b16d
1 changed files with 13 additions and 0 deletions
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13
drivers/iio/industrialio-core.c
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@@ -26,6 +26,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/wordpart.h>
#include <linux/iio/buffer.h>
#include <linux/iio/buffer_impl.h>
@@ -966,8 +967,10 @@ 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)
@@ -991,6 +994,9 @@ 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;
}
@@ -1001,6 +1007,13 @@ 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 = upper_32_bits(integer64);
integer = lower_32_bits(integer64);
} else {
ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
scale_db);