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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * APM emulation for PMU-based machines4 *5 * Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org)6 */7 8#include <linux/kernel.h>9#include <linux/module.h>10#include <linux/apm-emulation.h>11#include <linux/adb.h>12#include <linux/pmu.h>13 14#define APM_CRITICAL 1015#define APM_LOW 3016 17static void pmu_apm_get_power_status(struct apm_power_info *info)18{19 int percentage = -1;20 int batteries = 0;21 int time_units = -1;22 int real_count = 0;23 int i;24 char charging = 0;25 long charge = -1;26 long amperage = 0;27 unsigned long btype = 0;28 29 info->battery_status = APM_BATTERY_STATUS_UNKNOWN;30 info->battery_flag = APM_BATTERY_FLAG_UNKNOWN;31 info->units = APM_UNITS_MINS;32 33 if (pmu_power_flags & PMU_PWR_AC_PRESENT)34 info->ac_line_status = APM_AC_ONLINE;35 else36 info->ac_line_status = APM_AC_OFFLINE;37 38 for (i=0; i<pmu_battery_count; i++) {39 if (pmu_batteries[i].flags & PMU_BATT_PRESENT) {40 batteries++;41 if (percentage < 0)42 percentage = 0;43 if (charge < 0)44 charge = 0;45 percentage += (pmu_batteries[i].charge * 100) /46 pmu_batteries[i].max_charge;47 charge += pmu_batteries[i].charge;48 amperage += pmu_batteries[i].amperage;49 if (btype == 0)50 btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK);51 real_count++;52 if ((pmu_batteries[i].flags & PMU_BATT_CHARGING))53 charging++;54 }55 }56 if (batteries == 0)57 info->ac_line_status = APM_AC_ONLINE;58 59 if (real_count) {60 if (amperage < 0) {61 if (btype == PMU_BATT_TYPE_SMART)62 time_units = (charge * 59) / (amperage * -1);63 else64 time_units = (charge * 16440) / (amperage * -60);65 }66 percentage /= real_count;67 if (charging > 0) {68 info->battery_status = APM_BATTERY_STATUS_CHARGING;69 info->battery_flag = APM_BATTERY_FLAG_CHARGING;70 } else if (percentage <= APM_CRITICAL) {71 info->battery_status = APM_BATTERY_STATUS_CRITICAL;72 info->battery_flag = APM_BATTERY_FLAG_CRITICAL;73 } else if (percentage <= APM_LOW) {74 info->battery_status = APM_BATTERY_STATUS_LOW;75 info->battery_flag = APM_BATTERY_FLAG_LOW;76 } else {77 info->battery_status = APM_BATTERY_STATUS_HIGH;78 info->battery_flag = APM_BATTERY_FLAG_HIGH;79 }80 }81 82 info->battery_life = percentage;83 info->time = time_units;84}85 86static int __init apm_emu_init(void)87{88 apm_get_power_status = pmu_apm_get_power_status;89 90 printk(KERN_INFO "apm_emu: PMU APM Emulation initialized.\n");91 92 return 0;93}94 95static void __exit apm_emu_exit(void)96{97 if (apm_get_power_status == pmu_apm_get_power_status)98 apm_get_power_status = NULL;99 100 printk(KERN_INFO "apm_emu: PMU APM Emulation removed.\n");101}102 103module_init(apm_emu_init);104module_exit(apm_emu_exit);105 106MODULE_AUTHOR("Benjamin Herrenschmidt");107MODULE_DESCRIPTION("APM emulation for PowerMac");108MODULE_LICENSE("GPL");109