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battery: Add the battery hooking API

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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 <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Ognjen Galic 2018-02-07 15:58:13 +01:00 • committed by Rafael J. Wysocki
commit fa93854f7a
5 changed files with 167 additions and 16 deletions
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21
include/acpi/battery.h Normal file
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/* 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