kernel/linux.git/include/linux/mfd/macsmc.h, branch v6.19.11

mfd: macsmc: Make SMC write buffers const

2025-11-06T14:03:28+00:00

Mark the write buffer arguments in apple_smc_write(), apple_smc_rw(), and apple_smc_write_atomic() as const. These functions do not modify the data provided by the caller, so the parameters should be const qualified. Signed-off-by: Atharva Tiwari Reviewed-by: Sven Peter Signed-off-by: Lee Jones

mfd: macsmc: Add new __SMC_KEY macro

2025-11-06T13:58:42+00:00

When using the _SMC_KEY macro in switch/case statements, GCC 15.2.1 errors out with 'case label does not reduce to an integer constant'. Introduce a new __SMC_KEY macro that can be used instead. Signed-off-by: James Calligeros Link: https://patch.msgid.link/20251025-macsmc-subdevs-v4-5-374d5c9eba0e@gmail.com Signed-off-by: Lee Jones

mfd: Add Apple Silicon System Management Controller

2025-07-24T08:47:33+00:00

The System Management Controller (SMC) on Apple Silicon machines is a piece of hardware that exposes various functionalities such as temperature sensors, voltage/power meters, shutdown/reboot handling, GPIOs and more. Communication happens via a shared mailbox using the RTKit protocol which is also used for other co-processors. The SMC protocol then allows reading and writing many different keys which implement the various features. The MFD core device handles this protocol and exposes it to the sub-devices. Some of the sub-devices are potentially also useful on pre-M1 Apple machines and support for SMCs on these machines can be added at a later time. Co-developed-by: Hector Martin Signed-off-by: Hector Martin Reviewed-by: Alyssa Rosenzweig Reviewed-by: Neal Gompa Signed-off-by: Sven Peter Link: https://lore.kernel.org/r/20250610-smc-6-15-v7-5-556cafd771d3@kernel.org Signed-off-by: Lee Jones