kernel/linux.git/drivers/iio/temperature, branch v6.1.168

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

2025-08-28T14:26:16+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.

2025-05-18T06:21:24+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: temperature: ltc2983: make bulk write buffer DMA-safe

2022-12-31T12:32:40+00:00

[ Upstream commit 5e0176213949724fbe9a8e4a39817edce337b8a0 ] regmap_bulk_write() does not guarantee implicit DMA-safety, even though the current implementation duplicates the given buffer. Do not rely on it. Fixes: f110f3188e56 ("iio: temperature: Add support for LTC2983") Signed-off-by: Cosmin Tanislav Link: https://lore.kernel.org/r/20221103130041.2153295-2-demonsingur@gmail.com Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin

iio: temperature: ltc2983: allocate iio channels once

2022-10-17T07:51:26+00:00

Currently, every time the device wakes up from sleep, the iio_chan array is reallocated, leaking the previous one until the device is removed (basically never). Move the allocation to the probe function to avoid this. Signed-off-by: Cosmin Tanislav Fixes: f110f3188e563 ("iio: temperature: Add support for LTC2983") Cc: Link: https://lore.kernel.org/r/20221014123724.1401011-2-demonsingur@gmail.com Signed-off-by: Jonathan Cameron

Merge tag 'char-misc-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2022-10-08T15:56:37+00:00

Pull char/misc and other driver updates from Greg KH: "Here is the large set of char/misc and other small driver subsystem changes for 6.1-rc1. Loads of different things in here: - IIO driver updates, additions, and changes. Probably the largest part of the diffstat - habanalabs driver update with support for new hardware and features, the second largest part of the diff. - fpga subsystem driver updates and additions - mhi subsystem updates - Coresight driver updates - gnss subsystem updates - extcon driver updates - icc subsystem updates - fsi subsystem updates - nvmem subsystem and driver updates - misc driver updates - speakup driver additions for new features - lots of tiny driver updates and cleanups All of these have been in the linux-next tree for a while with no reported issues" * tag 'char-misc-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (411 commits) w1: Split memcpy() of struct cn_msg flexible array spmi: pmic-arb: increase SPMI transaction timeout delay spmi: pmic-arb: block access for invalid PMIC arbiter v5 SPMI writes spmi: pmic-arb: correct duplicate APID to PPID mapping logic spmi: pmic-arb: add support to dispatch interrupt based on IRQ status spmi: pmic-arb: check apid against limits before calling irq handler spmi: pmic-arb: do not ack and clear peripheral interrupts in cleanup_irq spmi: pmic-arb: handle spurious interrupt spmi: pmic-arb: add a print in cleanup_irq drivers: spmi: Directly use ida_alloc()/free() MAINTAINERS: add TI ECAP driver info counter: ti-ecap-capture: capture driver support for ECAP Documentation: ABI: sysfs-bus-counter: add frequency & num_overflows items dt-bindings: counter: add ti,am62-ecap-capture.yaml counter: Introduce the COUNTER_COMP_ARRAY component type counter: Consolidate Counter extension sysfs attribute creation counter: Introduce the Count capture component counter: 104-quad-8: Add Signal polarity component counter: Introduce the Signal polarity component counter: interrupt-cnt: Implement watch_validate callback ...

iio: temperature: mlx90614 Refactoring available filter attributes

2022-09-21T17:42:53+00:00

Change/refactor to the new way of defining available attribute values. Signed-off-by: Crt Mori Link: https://lore.kernel.org/r/20220906112632.244453-1-cmo@melexis.com Signed-off-by: Jonathan Cameron

i2c: Make remove callback return void

2022-08-16T10:46:26+00:00

The value returned by an i2c driver's remove function is mostly ignored. (Only an error message is printed if the value is non-zero that the error is ignored.) So change the prototype of the remove function to return no value. This way driver authors are not tempted to assume that passing an error to the upper layer is a good idea. All drivers are adapted accordingly. There is no intended change of behaviour, all callbacks were prepared to return 0 before. Reviewed-by: Peter Senna Tschudin Reviewed-by: Jeremy Kerr Reviewed-by: Benjamin Mugnier Reviewed-by: Javier Martinez Canillas Reviewed-by: Crt Mori Reviewed-by: Heikki Krogerus Acked-by: Greg Kroah-Hartman Acked-by: Marek Behún # for leds-turris-omnia Acked-by: Andy Shevchenko Reviewed-by: Petr Machata # for mlxsw Reviewed-by: Maximilian Luz # for surface3_power Acked-by: Srinivas Pandruvada # for bmc150-accel-i2c + kxcjk-1013 Reviewed-by: Hans Verkuil # for media/* + staging/media/* Acked-by: Miguel Ojeda # for auxdisplay/ht16k33 + auxdisplay/lcd2s Reviewed-by: Luca Ceresoli # for versaclock5 Reviewed-by: Ajay Gupta # for ucsi_ccg Acked-by: Jonathan Cameron # for iio Acked-by: Peter Rosin # for i2c-mux-*, max9860 Acked-by: Adrien Grassein # for lontium-lt8912b Reviewed-by: Jean Delvare # for hwmon, i2c-core and i2c/muxes Acked-by: Corey Minyard # for IPMI Reviewed-by: Vladimir Oltean Acked-by: Dmitry Torokhov Acked-by: Sebastian Reichel # for drivers/power Acked-by: Krzysztof Hałasa Signed-off-by: Uwe Kleine-König Signed-off-by: Wolfram Sang

iio: temperature: mlx90632 Add supply regulator to sensor

2022-08-15T21:30:03+00:00

Provide possibility to toggle power supply to the sensor so that user can optimize their setup and not have the sensor constantly powered. Signed-off-by: Crt Mori Link: https://lore.kernel.org/r/20220808144908.1559069-1-cmo@melexis.com Signed-off-by: Jonathan Cameron

iio: temperature: ltc2983: Switch to DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr()

2022-07-18T17:48:18+00:00

Using these newer macros allows the compiler to remove the unused structure and functions when !CONFIG_PM_SLEEP + removes the need to mark pm functions __maybe_unused. Signed-off-by: Jonathan Cameron Cc: Nuno Sá Reviewed-by: Nuno Sá Reviewed-by: Paul Cercueil Link: https://lore.kernel.org/r/20220621202719.13644-26-jic23@kernel.org

iio: temp: maxim_thermocouple: Fix alignment for DMA safety

2022-06-14T10:53:19+00:00

____cacheline_aligned is an insufficient guarantee for non-coherent DMA on platforms with 128 byte cachelines above L1. Switch to the updated IIO_DMA_MINALIGN definition Fixes: 1f25ca11d84a ("iio: temperature: add support for Maxim thermocouple chips") Signed-off-by: Jonathan Cameron Cc: Matt Ranostay Acked-by: Nuno Sá Link: https://lore.kernel.org/r/20220508175712.647246-93-jic23@kernel.org