From: Sam Winchenbach <swinchenbach@arka.org>
Date: Fri, 28 Mar 2025 17:48:30 +0000 (-0400)
Subject: iio: core: Add support for writing 64 bit attrs
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=c31752b16de1dcd735162046dc33000311ad5b85;p=users%2Fjedix%2Flinux-maple.git

iio: core: Add support for writing 64 bit attrs

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>
---

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index b9f4113ae5fc3..c9955a1c10903 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -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);