1 /* 2 * APM emulation for PMU-based machines 3 * 4 * Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org) 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2, or (at your option) any 9 * later version. 10 * 11 * This program is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/apm-emulation.h> 22 #include <linux/adb.h> 23 #include <linux/pmu.h> 24 25 #define APM_CRITICAL 10 26 #define APM_LOW 30 27 28 static void pmu_apm_get_power_status(struct apm_power_info *info) 29 { 30 int percentage = -1; 31 int batteries = 0; 32 int time_units = -1; 33 int real_count = 0; 34 int i; 35 char charging = 0; 36 long charge = -1; 37 long amperage = 0; 38 unsigned long btype = 0; 39 40 info->battery_status = APM_BATTERY_STATUS_UNKNOWN; 41 info->battery_flag = APM_BATTERY_FLAG_UNKNOWN; 42 info->units = APM_UNITS_MINS; 43 44 if (pmu_power_flags & PMU_PWR_AC_PRESENT) 45 info->ac_line_status = APM_AC_ONLINE; 46 else 47 info->ac_line_status = APM_AC_OFFLINE; 48 49 for (i=0; i<pmu_battery_count; i++) { 50 if (pmu_batteries[i].flags & PMU_BATT_PRESENT) { 51 batteries++; 52 if (percentage < 0) 53 percentage = 0; 54 if (charge < 0) 55 charge = 0; 56 percentage += (pmu_batteries[i].charge * 100) / 57 pmu_batteries[i].max_charge; 58 charge += pmu_batteries[i].charge; 59 amperage += pmu_batteries[i].amperage; 60 if (btype == 0) 61 btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK); 62 real_count++; 63 if ((pmu_batteries[i].flags & PMU_BATT_CHARGING)) 64 charging++; 65 } 66 } 67 if (batteries == 0) 68 info->ac_line_status = APM_AC_ONLINE; 69 70 if (real_count) { 71 if (amperage < 0) { 72 if (btype == PMU_BATT_TYPE_SMART) 73 time_units = (charge * 59) / (amperage * -1); 74 else 75 time_units = (charge * 16440) / (amperage * -60); 76 } 77 percentage /= real_count; 78 if (charging > 0) { 79 info->battery_status = APM_BATTERY_STATUS_CHARGING; 80 info->battery_flag = APM_BATTERY_FLAG_CHARGING; 81 } else if (percentage <= APM_CRITICAL) { 82 info->battery_status = APM_BATTERY_STATUS_CRITICAL; 83 info->battery_flag = APM_BATTERY_FLAG_CRITICAL; 84 } else if (percentage <= APM_LOW) { 85 info->battery_status = APM_BATTERY_STATUS_LOW; 86 info->battery_flag = APM_BATTERY_FLAG_LOW; 87 } else { 88 info->battery_status = APM_BATTERY_STATUS_HIGH; 89 info->battery_flag = APM_BATTERY_FLAG_HIGH; 90 } 91 } 92 93 info->battery_life = percentage; 94 info->time = time_units; 95 } 96 97 static int __init apm_emu_init(void) 98 { 99 apm_get_power_status = pmu_apm_get_power_status; 100 101 printk(KERN_INFO "apm_emu: PMU APM Emulation initialized.\n"); 102 103 return 0; 104 } 105 106 static void __exit apm_emu_exit(void) 107 { 108 if (apm_get_power_status == pmu_apm_get_power_status) 109 apm_get_power_status = NULL; 110 111 printk(KERN_INFO "apm_emu: PMU APM Emulation removed.\n"); 112 } 113 114 module_init(apm_emu_init); 115 module_exit(apm_emu_exit); 116 117 MODULE_AUTHOR("Benjamin Herrenschmidt"); 118 MODULE_DESCRIPTION("APM emulation for PowerMac"); 119 MODULE_LICENSE("GPL"); 120