From fa93854f7a7ed63d054405bf3779247d5300edd3 Mon Sep 17 00:00:00 2001 From: Ognjen Galic Date: Wed, 7 Feb 2018 15:58:13 +0100 Subject: battery: Add the battery hooking API 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: Ognjen Galic Signed-off-by: Rafael J. Wysocki --- include/acpi/battery.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 include/acpi/battery.h (limited to 'include/acpi') diff --git a/include/acpi/battery.h b/include/acpi/battery.h new file mode 100644 index 000000000000..5d8f5d910c82 --- /dev/null +++ b/include/acpi/battery.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ACPI_BATTERY_H +#define __ACPI_BATTERY_H + +#define ACPI_BATTERY_CLASS "battery" + +#define ACPI_BATTERY_NOTIFY_STATUS 0x80 +#define ACPI_BATTERY_NOTIFY_INFO 0x81 +#define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82 + +struct acpi_battery_hook { + const char *name; + int (*add_battery)(struct power_supply *battery); + int (*remove_battery)(struct power_supply *battery); + struct list_head list; +}; + +void battery_hook_register(struct acpi_battery_hook *hook); +void battery_hook_unregister(struct acpi_battery_hook *hook); + +#endif -- cgit v1.2.3