• Ognjen Galic's avatar
    battery: Add the battery hooking API · fa93854f
    Ognjen Galic authored
    This is a patch that implements a generic hooking API for the
    generic ACPI battery driver.
    With this new generic API, drivers can expose platform specific
    behaviour via sysfs attributes in /sys/class/power_supply/BATn/
    in a generic way.
    A perfect example of the need for this API are Lenovo ThinkPads.
    Lenovo ThinkPads have a ACPI extension that allows the setting of
    start and stop charge thresholds in the EC and battery firmware
    via ACPI. The thinkpad_acpi module can use this API to expose
    sysfs attributes that it controls inside the ACPI battery driver
    sysfs tree, under /sys/class/power_supply/BATN/.
    The file drivers/acpi/battery.h has been moved to
    include/acpi/battery.h and the includes inside ac.c, sbs.c, and
    battery.c have been adjusted to reflect that.
    When drivers hooks into the API, the API calls add_battery() for
    each battery in the system that passes it a acpi_battery
    struct. Then, the drivers can use device_create_file() to create
    new sysfs attributes with that struct and identify the batteries
    for per-battery attributes.
    Signed-off-by: default avatarOgnjen Galic <smclt30p@gmail.com>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
battery.h 561 Bytes