linux-kernel - [PATCH v6 5/6] driver core: Add support for writing 64 bit attrs

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Message-ID: <20250307150216.374643-5-sam.winchenbach@framepointer.org>
Date: Fri,  7 Mar 2025 10:02:15 -0500
From: Sam Winchenbach <sam.winchenbach@...mepointer.org>
To: linux-kernel@...r.kernel.org
Cc: lars@...afoo.de,
	Michael.Hennerich@...log.com,
	antoniu.miclaus@...log.com,
	jic23@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	sam.winchenbach@...mepointer.org,
	bpellegrino@...a.org
Subject: [PATCH v6 5/6] driver 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 <sam.winchenbach@...mepointer.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 a2117ad1337d..b2436b8f3eea 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);
-- 
2.48.1