nixos/spec/reimaden/ac71/battery.c

124 lines
2.8 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include "pr.h"
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/power_supply.h>
#include <acpi/battery.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <linux/version.h>
#include "ec.h"
/* ========================================================================== */
#if IS_ENABLED(CONFIG_ACPI_BATTERY)
static bool battery_hook_registered;
static bool nobattery;
module_param(nobattery, bool, 0444);
MODULE_PARM_DESC(nobattery, "do not expose battery related controls (default=false)");
/* ========================================================================== */
static ssize_t charge_control_end_threshold_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int status = ec_read_byte(BATT_CHARGE_CTRL_ADDR);
if (status < 0)
return status;
status &= BATT_CHARGE_CTRL_VALUE_MASK;
if (status == 0)
status = 100;
return sprintf(buf, "%d\n", status);
}
static ssize_t charge_control_end_threshold_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int status, value;
if (kstrtoint(buf, 10, &value) || !(1 <= value && value <= 100))
return -EINVAL;
status = ec_read_byte(BATT_CHARGE_CTRL_ADDR);
if (status < 0)
return status;
if (value == 100)
value = 0;
status = (status & ~BATT_CHARGE_CTRL_VALUE_MASK) | value;
status = ec_write_byte(BATT_CHARGE_CTRL_ADDR, status);
if (status < 0)
return status;
return count;
}
static DEVICE_ATTR_RW(charge_control_end_threshold);
static struct attribute *ac71_batt_attrs[] = {
&dev_attr_charge_control_end_threshold.attr,
NULL
};
ATTRIBUTE_GROUPS(ac71_batt);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 2, 0)
static int ac71_batt_add(struct power_supply *battery, struct acpi_battery_hook *hook)
#else
static int ac71_batt_add(struct power_supply *battery)
#endif
{
if (strcmp(battery->desc->name, "BAT0") != 0)
return 0;
return device_add_groups(&battery->dev, ac71_batt_groups);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 2, 0)
static int ac71_batt_remove(struct power_supply *battery, struct acpi_battery_hook *hook)
#else
static int ac71_batt_remove(struct power_supply *battery)
#endif
{
if (strcmp(battery->desc->name, "BAT0") != 0)
return 0;
device_remove_groups(&battery->dev, ac71_batt_groups);
return 0;
}
static struct acpi_battery_hook ac71_batt_hook = {
.add_battery = ac71_batt_add,
.remove_battery = ac71_batt_remove,
.name = "AC71 laptop battery extension",
};
int __init ac71_battery_setup(void)
{
if (nobattery)
return -ENODEV;
battery_hook_register(&ac71_batt_hook);
battery_hook_registered = true;
return 0;
}
void ac71_battery_cleanup(void)
{
if (battery_hook_registered)
battery_hook_unregister(&ac71_batt_hook);
}
#endif