kernel/linux.git/drivers/iio/temperature, branch v6.6.131

iio: temperature: maxim_thermocouple: use DMA-safe buffer for spi_read()

2025-08-28T14:28:47+00:00

[ Upstream commit ae5bc07ec9f73a41734270ef3f800c5c8a7e0ad3 ] Replace using stack-allocated buffers with a DMA-safe buffer for use with spi_read(). This allows the driver to be safely used with DMA-enabled SPI controllers. The buffer array is also converted to a struct with a union to make the usage of the memory in the buffer more clear and ensure proper alignment. Fixes: 1f25ca11d84a ("iio: temperature: add support for Maxim thermocouple chips") Signed-off-by: David Lechner Reviewed-by: Nuno Sá Link: https://patch.msgid.link/20250721-iio-use-more-iio_declare_buffer_with_ts-3-v2-1-0c68d41ccf6c@baylibre.com Cc: Signed-off-by: Jonathan Cameron [ iio_push_to_buffers_with_ts() => iio_push_to_buffers_with_timestamp() ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

iio: temp: maxim-thermocouple: Fix potential lack of DMA safe buffer.

2025-05-18T06:24:09+00:00

[ Upstream commit f79aeb6c631b57395f37acbfbe59727e355a714c ] The trick of using __aligned(IIO_DMA_MINALIGN) ensures that there is no overlap between buffers used for DMA and those used for driver state storage that are before the marking. It doesn't ensure anything above state variables found after the marking. Hence move this particular bit of state earlier in the structure. Fixes: 10897f34309b ("iio: temp: maxim_thermocouple: Fix alignment for DMA safety") Reviewed-by: David Lechner Link: https://patch.msgid.link/20250413103443.2420727-14-jic23@kernel.org Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin

iio: adc: Explicitly include correct DT includes

2023-07-23T12:38:13+00:00

The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring Acked-by: Heiko Stuebner Link: https://lore.kernel.org/r/20230714174628.4057920-1-robh@kernel.org Signed-off-by: Jonathan Cameron

iio: temperature: tmp006: Add OF device matching support

2023-05-28T19:22:03+00:00

Adds an of_device_id table entry to the driver, enabling device matching through device tree. With this update, the driver can now match devices using both the i2c_device_id entry and the newly added of_device_id table. Signed-off-by: Anup Sharma Reviewed-by: Conor Dooley Link: https://lore.kernel.org/r/72746bdfd8f74171943e41759b891c7af40627ec.1684579603.git.anupnewsmail@gmail.com Signed-off-by: Jonathan Cameron

iio: mlx90614: Add MLX90615 support

2023-05-23T20:20:17+00:00

Add support for MLX90615 Infra Red Thermometer, which seems to be the predecesor of MLX90614 . There are significant differences in the register layout compared to MLX90614, but the functionality of the device is virtually identical. The following differences have been identified: - RAM/EEPROM/SLEEP access opcodes are different - RAM/EEPROM registers are at different offsets - EEPROM emissivity and configuration registers are at different offsets - EEPROM configuration register bits are shuffled around - EEPROM emissivity settings are 14 bit on MLX90615 , 16 bit on MLX90614 - MLX90615 can only ever support one sensor, MLX90614 could support two - FIR filter is set to fixed settings on MLX90615 - IIR filter coefficients are different This patch fills in the MLX90615 specific description and quirk handling. The IIR filter coefficients were provided by Melexis as follows: 0b0000 - Forbidden value 0b0001 - 100% - settling time = refresh rate = 205ms (around 5Hz) 0b0010 - 50% - settling time = 2050ms (around 0.5Hz) 0b0011 - 33% - settling time = 36900ms (around 0.3Hz) 0b0100 - 25% - settling time = 5125ms (around 0.2Hz) 0b0101 - 20% - settling time = 6355ms (around 0.15Hz) 0b0110 - 17% - settling time = 7790ms (around 0.13Hz) 0b0111 - 14% - settling time = 9225ms (around 0.1Hz) Signed-off-by: Marek Vasut Acked-by: Crt Mori Link: https://lore.kernel.org/r/20230510102251.10118-6-marex@denx.de Signed-off-by: Jonathan Cameron

iio: mlx90614: Factor our register IO and constants into model specific descriptor

2023-05-23T20:20:17+00:00

Factor out all the differences between MLX90614 and other similar chips into a structure which describes the chip and allows abstracting out the differences from the driver code. No functional change. This patch moves all the RAM and EEPROM IO opcodes into the descriptor structure and combines them, instead of combining the opcode and offset in macros. Acked-by: Crt Mori Tested-by: Crt Mori Signed-off-by: Marek Vasut Link: https://lore.kernel.org/r/20230510102251.10118-5-marex@denx.de Signed-off-by: Jonathan Cameron

iio: mlx90614: Drop MLX90614_CONST_EMISSIVITY_RESOLUTION

2023-05-23T20:20:16+00:00

The MLX90614_CONST_EMISSIVITY_RESOLUTION can be calculated from MLX90614_CONST_RAW_EMISSIVITY_MAX, perform the calculation inline and drio the MLX90614_CONST_EMISSIVITY_RESOLUTION. Signed-off-by: Marek Vasut Acked-by: Crt Mori Link: https://lore.kernel.org/r/20230510102251.10118-4-marex@denx.de Signed-off-by: Jonathan Cameron

iio: mlx90614: Drop unused register macros

2023-05-23T20:20:16+00:00

To simplify addition of support for new parts, drop unused register macros. No functional change. Acked-by: Crt Mori Signed-off-by: Marek Vasut Link: https://lore.kernel.org/r/20230510102251.10118-3-marex@denx.de Signed-off-by: Jonathan Cameron

iio: mlx90614: Sort headers

2023-05-23T20:20:16+00:00

Sort the headers alphabetically. No functional change. Acked-by: Crt Mori Signed-off-by: Marek Vasut Link: https://lore.kernel.org/r/20230510102251.10118-2-marex@denx.de Signed-off-by: Jonathan Cameron

iio: Switch i2c drivers back to use .probe()

2023-05-21T17:54:53+00:00

After commit b8a1a4cd5a98 ("i2c: Provide a temporary .probe_new() call-back type"), all drivers being converted to .probe_new() and then 03c835f498b5 ("i2c: Switch .probe() to not take an id parameter") convert back to (the new) .probe() to be able to eventually drop .probe_new() from struct i2c_driver. Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20230515205048.19561-1-u.kleine-koenig@pengutronix.de Signed-off-by: Jonathan Cameron