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| 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 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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