linux/drivers/macintosh/apm_emu.c
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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
  28static 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
  97static 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
 106static 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
 114module_init(apm_emu_init);
 115module_exit(apm_emu_exit);
 116
 117MODULE_AUTHOR("Benjamin Herrenschmidt");
 118MODULE_DESCRIPTION("APM emulation for PowerMac");
 119MODULE_LICENSE("GPL");
 120
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