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