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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* APM emulation for PMU-based machines
*
* Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org)
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/apm-emulation.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#define APM_CRITICAL 10
#define APM_LOW 30
static void pmu_apm_get_power_status(struct apm_power_info *info)
{
int percentage = -1;
int batteries = 0;
int time_units = -1;
int real_count = 0;
int i;
char charging = 0;
long charge = -1;
long amperage = 0;
unsigned long btype = 0;
info->battery_status = APM_BATTERY_STATUS_UNKNOWN;
info->battery_flag = APM_BATTERY_FLAG_UNKNOWN;
info->units = APM_UNITS_MINS;
if (pmu_power_flags & PMU_PWR_AC_PRESENT)
info->ac_line_status = APM_AC_ONLINE;
else
info->ac_line_status = APM_AC_OFFLINE;
for (i=0; i<pmu_battery_count; i++) {
if (pmu_batteries[i].flags & PMU_BATT_PRESENT) {
batteries++;
if (percentage < 0)
percentage = 0;
if (charge < 0)
charge = 0;
percentage += (pmu_batteries[i].charge * 100) /
pmu_batteries[i].max_charge;
charge += pmu_batteries[i].charge;
amperage += pmu_batteries[i].amperage;
if (btype == 0)
btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK);
real_count++;
if ((pmu_batteries[i].flags & PMU_BATT_CHARGING))
charging++;
}
}
if (batteries == 0)
info->ac_line_status = APM_AC_ONLINE;
if (real_count) {
if (amperage < 0) {
if (btype == PMU_BATT_TYPE_SMART)
time_units = (charge * 59) / (amperage * -1);
else
time_units = (charge * 16440) / (amperage * -60);
}
percentage /= real_count;
if (charging > 0) {
info->battery_status = APM_BATTERY_STATUS_CHARGING;
info->battery_flag = APM_BATTERY_FLAG_CHARGING;
} else if (percentage <= APM_CRITICAL) {
info->battery_status = APM_BATTERY_STATUS_CRITICAL;
info->battery_flag = APM_BATTERY_FLAG_CRITICAL;
} else if (percentage <= APM_LOW) {
info->battery_status = APM_BATTERY_STATUS_LOW;
info->battery_flag = APM_BATTERY_FLAG_LOW;
} else {
info->battery_status = APM_BATTERY_STATUS_HIGH;
info->battery_flag = APM_BATTERY_FLAG_HIGH;
}
}
info->battery_life = percentage;
info->time = time_units;
}
static int __init apm_emu_init(void)
{
apm_get_power_status = pmu_apm_get_power_status;
printk(KERN_INFO "apm_emu: PMU APM Emulation initialized.\n");
return 0;
}
static void __exit apm_emu_exit(void)
{
if (apm_get_power_status == pmu_apm_get_power_status)
apm_get_power_status = NULL;
printk(KERN_INFO "apm_emu: PMU APM Emulation removed.\n");
}
module_init(apm_emu_init);
module_exit(apm_emu_exit);
MODULE_AUTHOR("Benjamin Herrenschmidt");
MODULE_DESCRIPTION("APM emulation for PowerMac");
MODULE_LICENSE("GPL");
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