kernel/linux.git/drivers/misc/keba, branch v6.18.21

misc: keba: Fix kernfs warning on module unload

2025-01-10T09:16:39+00:00

Unloading the cp500 module leads to the following warning: kernfs: can not remove 'eeprom', no directory WARNING: CPU: 1 PID: 1610 at fs/kernfs/dir.c:1683 kernfs_remove_by_name_ns+0xb1/0xc0 The parent I2C device of the nvmem devices is freed before the nvmem devices. The reference to the nvmem devices is put by devm after cp500_remove(), but at this time the parent I2C device does not exist anymore as the I2C controller and its devices have already been freed in cp500_remove(). Thus, nvmem tries to remove an entry from an already deleted directory. Free nvmem devices before I2C controller auxiliary device. Signed-off-by: Gerhard Engleder Link: https://lore.kernel.org/r/20241214215759.60811-1-gerhard@engleder-embedded.com Signed-off-by: Greg Kroah-Hartman

misc: keba: Add hardware dependency

2024-11-07T08:53:46+00:00

Only propose KEBA CP500 drivers on architectures where the device exists, unless build-testing. Signed-off-by: Jean Delvare Cc: Gerhard Engleder Link: https://lore.kernel.org/r/20241104142217.1dad57cf@endymion.delvare Signed-off-by: Greg Kroah-Hartman

misc: keba: Fix missing I2C dependency

2024-10-18T11:42:18+00:00

Kernel test robot reported a build error on csky: drivers/misc/keba/cp500.c:287:(.text+0x1c0): undefined reference to `i2c_verify_client' Add I2C dependency to fix build error. Fixes: 794848300103 ("misc: keba: Add SPI controller device") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202410130817.NXBCxx4q-lkp@intel.com/ Signed-off-by: Gerhard Engleder Link: https://lore.kernel.org/r/20241016182751.10457-1-gerhard@engleder-embedded.com Signed-off-by: Greg Kroah-Hartman

misc: keba: Add UART devices

2024-10-13T15:16:57+00:00

Add support for the UART auxiliary devices. This enables access to up to 3 different UARTs, which are implemented in the FPGA. Signed-off-by: Gerhard Engleder Link: https://lore.kernel.org/r/20241011191257.19702-9-gerhard@engleder-embedded.com Signed-off-by: Greg Kroah-Hartman

misc: keba: Add battery device

2024-10-13T15:16:57+00:00

Add support for the battery auxiliary device. This enables monitoring of the battery. Signed-off-by: Gerhard Engleder Link: https://lore.kernel.org/r/20241011191257.19702-8-gerhard@engleder-embedded.com Signed-off-by: Greg Kroah-Hartman

misc: keba: Add fan device

2024-10-13T15:16:57+00:00

Add support for the fan auxiliary device. This enables monitoring of the fan. Signed-off-by: Gerhard Engleder Link: https://lore.kernel.org/r/20241011191257.19702-7-gerhard@engleder-embedded.com Signed-off-by: Greg Kroah-Hartman

misc: keba: Support EEPROM sections as separate devices

2024-10-13T15:16:57+00:00

The main EEPROM of KEBA CP500 devices is divided into two sections. One section for type label data like device name, order number, serial number and so on. The second section is reserved for arbitrary data stored by the user. The two sections have a defined range. The first 3 kB for the type label and the remaining 1 kB for user data. The type label is written during production and can fill up the whole 3 kB. Thus, the range is fixed and cannot be changed dynamically. The two sections cannot be presented as NVMEM cells. A NVMEM cell is always read and written at once, because the data presented to the user can differ from the data stored in the physical NVMEM cell. Thus, NVMEM cells would lead to reading 3 kB for every type label access, even if only the device name is read. So performance would suffer. But it is also an indication that NVMEM cells are designed for small data cells within NVMEM devices. Register separate NVMEM devices for every section. This enables safe access to every section. Also different access rights are then possible. Signed-off-by: Gerhard Engleder Link: https://lore.kernel.org/r/20241011191257.19702-6-gerhard@engleder-embedded.com Signed-off-by: Greg Kroah-Hartman

misc: keba: Add LAN9252 driver

2024-10-13T15:16:57+00:00

KEBA CP500 devices use the LAN9252 controller for EtherCAT communication. For a stable Ethernet link the PHY registers of the controller need to be configured correctly. This driver configures these PHY registers as required. Signed-off-by: Gerhard Engleder Link: https://lore.kernel.org/r/20241011191257.19702-5-gerhard@engleder-embedded.com Signed-off-by: Greg Kroah-Hartman

misc: keba: Add SPI controller device

2024-10-13T15:16:57+00:00

Add support for the SPI controller auxiliary device. This enables access to the SPI flash of the FPGA and some other SPI devices. The actual list of SPI devices is detected by reading some bits out of the previously registered I2C EEPROM. Signed-off-by: Gerhard Engleder Link: https://lore.kernel.org/r/20241011191257.19702-4-gerhard@engleder-embedded.com Signed-off-by: Greg Kroah-Hartman

misc: keba: Use capital letters for I2C error message

2024-10-13T15:16:57+00:00

Print "I2C" instead of "i2c" in error message as "I2C" is the official name for the bus. Signed-off-by: Gerhard Engleder Link: https://lore.kernel.org/r/20241011191257.19702-3-gerhard@engleder-embedded.com Signed-off-by: Greg Kroah-Hartman