Adding device data structures and registration for Linux driver

Question

I am adding a gyro/accel driver (Invensense MPU3050), available here to my kernel (LPC Linux). I use LTIB for building the image and rootfs.

I manage in adding all files and the driver is available and compiles perfectly. Now I need to add a mpu3050_platform_data structure in the i2c_board_info_structure in the "board-generic.c" file ( README ) and then register it adding some lines in the same "board-generic.c" file.

Problem is, I cannot locate this/these file/s. Is their name depending on the linux distribution? Is the same info written somewhere else?

Answer 1

You need to add this to the file supporting the tegra board you are using. In the current 3.0-rc3 kernel (last tag I have checked out), I see these tegra board files (in arch/arm/mach-tegra):

• board-harmony.c
• board-paz00.c
• board-seaboard.c
• board-trimslice.c

These files configure the static devices for a given tegra board. Your config file then selects which ones are built. Here are the corresponding config options (from arch/arm/mach-tegra/Kconfig):

comment "Tegra board type"

config MACH_HARMONY
       bool "Harmony board"
       select MACH_HAS_SND_SOC_TEGRA_WM8903
       help
         Support for nVidia Harmony development platform

config MACH_KAEN
       bool "Kaen board"
       select MACH_SEABOARD
       select MACH_HAS_SND_SOC_TEGRA_WM8903
       help
         Support for the Kaen version of Seaboard

config MACH_PAZ00
       bool "Paz00 board"
       help
         Support for the Toshiba AC100/Dynabook AZ netbook

config MACH_SEABOARD
       bool "Seaboard board"
       select MACH_HAS_SND_SOC_TEGRA_WM8903
       help
         Support for nVidia Seaboard development platform. It will
     also be included for some of the derivative boards that
     have large similarities with the seaboard design.

config MACH_TRIMSLICE
       bool "TrimSlice board"
       select TEGRA_PCI
       help
         Support for CompuLab TrimSlice platform

config MACH_WARIO
       bool "Wario board"
       select MACH_SEABOARD
       help
         Support for the Wario version of Seaboard

Your build system (LTIB) certainly defines one of these config macros (CONFIG_MACH_HARMONY for instance). Look at your config file, see which one is enabled, and add the declaration of your i2c device in the corresponding board-xxx.c file.