/* * APM emulation for PMU-based machines * * Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org) * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * */ #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");