Here is the second version of the proposal to export SoC related information to user-space through sysFS interface. The first patch introduces the common part, which provides an interface to the platform to export platform-defined IDs to user-space. The IDs strings can be provided in two ways: either with a pointer to the string, or by a callback fullfilling the sysfs's "show" callback buffer. The second patch is given as example for the ux500 architecture. It registers the socinfo interface, and exports 5 values (Family name, machine name, silicon process, silicon revision, and serial number). Here is the output for DB8500: root@ME:/sys/socinfo ls -l -r--r--r-- 1 root root 4096 Jan 2 03:35 family -r--r--r-- 1 root root 4096 Jan 2 03:35 machine -r--r--r-- 1 root root 4096 Jan 2 03:35 process -r--r--r-- 1 root root 4096 Jan 2 03:35 revision -r--r--r-- 1 root root 4096 Jan 2 03:35 soc_id root@ME:/sys/socinfo cat machine DB8500 root@ME:/sys/socinfo cat family Ux500 root@ME:/sys/socinfo cat process Standard root@ME:/sys/socinfo cat revision 2.0 root@ME:/sys/socinfo cat soc_id 2ba07ce9e5835d6185321e9577462ef2ea2129cf ------------------------------------------------------------------------------- v1: Conclusion about first version : * /sys/devices/system is not right place for this interface. * "mach_name" should be declared as other attributes to simplify code. * The get_info callback should use directly the "show" callback buffer. * Documentation was missing (ABI description required) * Errors were not reported at registration time. * Macros should be used to create attributes. * Some kernel coding rules not followed. ------------------------------------------------------------------------------- Any comments are welcome. Note that I will be off from 13th to 21th of March. Regards, Maxime ------------------------------------------------------------------------------- Maxime Coquelin (2): Export SoC info through sysfs ux500: Export U8500 SoC info through sysfs Documentation/ABI/testing/sysfs-socinfo | 16 ++++++ arch/arm/mach-ux500/Kconfig | 1 + arch/arm/mach-ux500/id.c | 70 +++++++++++++++++++++++++++ drivers/base/Kconfig | 3 + drivers/base/Makefile | 1 + drivers/base/soc.c | 79 +++++++++++++++++++++++++++++++ include/linux/sys_soc.h | 50 +++++++++++++++++++ 7 files changed, 220 insertions(+), 0 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-socinfo create mode 100644 drivers/base/soc.c create mode 100644 include/linux/sys_soc.h -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
