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([116.72.73.183]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b9cae39e91sm34519135ad.56.2026.05.01.19.08.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2026 19:08:52 -0700 (PDT) From: Tabrez Ahmed To: linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org Cc: linux@roeck-us.net, david.laight.linux@gmail.com, me@brighamcampbell.com, shuah@kernel.org, Tabrez Ahmed Subject: [PATCH v6 0/3] hwmon: (ads7871) Fix endianness and modernize driver Date: Sat, 2 May 2026 07:38:41 +0530 Message-ID: <20260502020844.110038-1-tabreztalks@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This patch series addresses a critical endianness issue in the ads7871 hardware monitoring driver and updates the driver to use the modern hwmon API. The series is broken down as follows: - Patch 1: Fixes corrupted voltage readings on Big-Endian architectures by safely converting the 16-bit sensor output using le16_to_cpu(). - Patch 2: Modernizes the driver by migrating it from the deprecated hwmon API to hwmon_device_register_with_info(). - Patch 3: Ensures all SPI write operations use a properly allocated, DMA-safe buffer. Note: I do not have access to the physical ADS7871 hardware. This series has been compile-tested only. Changes in v6: - patch 1: - Switched back to using spi_w8r16() combined with le16_to_cpu() for the endian conversion, removing the manual byte array. - Added an early return for negative error codes from the SPI core to prevent mangling the error status before conversion. - Dropped the now-unused header. - patches 2 & 3: - Unchanged from v5. Changes in v5: - Fixed a bisectability issue where the include modernization was accidentally squashed into Patch 3 instead of Patch 1. Changes in v4: - Patch 1: Refactored 16-bit register reads to use a dedicated 'u8' transmit variable, eliminating a 32-bit pointer endianness hazard. Changes in v3: - Added Patch 1 to fix the pre-existing endianness bug in 16-bit reads. - Fixed multiple formatting and alignment issues caught by checkpatch --strict, as requested by Guenter Roeck. - Added "While at it, fix checkpatch violations" to Patch 2 commit message. Changes in v2: - Dropped custom mutex in favor of native hwmon core serialization. - Split API migration and DMA fix into separate, logical patches. - Corrected output scaling and sign extension to meet hwmon ABI. Tabrez Ahmed (3): hwmon: (ads7871) Fix endianness bug in 16-bit register reads hwmon: (ads7871) Convert to hwmon_device_register_with_info hwmon: (ads7871) Use DMA-safe buffer for SPI writes drivers/hwmon/ads7871.c | 115 +++++++++++++++++++++++----------------- 1 file changed, 65 insertions(+), 50 deletions(-) -- 2.43.0