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108 lines
2.7 KiB
108 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* APM emulation for PMU-based machines |
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* |
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* Copyright 2001 Benjamin Herrenschmidt ([email protected]) |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/apm-emulation.h> |
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#include <linux/adb.h> |
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#include <linux/pmu.h> |
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#define APM_CRITICAL 10 |
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#define APM_LOW 30 |
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static void pmu_apm_get_power_status(struct apm_power_info *info) |
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{ |
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int percentage = -1; |
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int batteries = 0; |
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int time_units = -1; |
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int real_count = 0; |
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int i; |
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char charging = 0; |
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long charge = -1; |
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long amperage = 0; |
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unsigned long btype = 0; |
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info->battery_status = APM_BATTERY_STATUS_UNKNOWN; |
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info->battery_flag = APM_BATTERY_FLAG_UNKNOWN; |
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info->units = APM_UNITS_MINS; |
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if (pmu_power_flags & PMU_PWR_AC_PRESENT) |
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info->ac_line_status = APM_AC_ONLINE; |
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else |
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info->ac_line_status = APM_AC_OFFLINE; |
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for (i=0; i<pmu_battery_count; i++) { |
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if (pmu_batteries[i].flags & PMU_BATT_PRESENT) { |
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batteries++; |
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if (percentage < 0) |
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percentage = 0; |
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if (charge < 0) |
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charge = 0; |
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percentage += (pmu_batteries[i].charge * 100) / |
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pmu_batteries[i].max_charge; |
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charge += pmu_batteries[i].charge; |
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amperage += pmu_batteries[i].amperage; |
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if (btype == 0) |
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btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK); |
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real_count++; |
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if ((pmu_batteries[i].flags & PMU_BATT_CHARGING)) |
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charging++; |
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} |
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} |
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if (batteries == 0) |
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info->ac_line_status = APM_AC_ONLINE; |
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if (real_count) { |
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if (amperage < 0) { |
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if (btype == PMU_BATT_TYPE_SMART) |
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time_units = (charge * 59) / (amperage * -1); |
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else |
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time_units = (charge * 16440) / (amperage * -60); |
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} |
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percentage /= real_count; |
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if (charging > 0) { |
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info->battery_status = APM_BATTERY_STATUS_CHARGING; |
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info->battery_flag = APM_BATTERY_FLAG_CHARGING; |
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} else if (percentage <= APM_CRITICAL) { |
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info->battery_status = APM_BATTERY_STATUS_CRITICAL; |
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info->battery_flag = APM_BATTERY_FLAG_CRITICAL; |
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} else if (percentage <= APM_LOW) { |
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info->battery_status = APM_BATTERY_STATUS_LOW; |
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info->battery_flag = APM_BATTERY_FLAG_LOW; |
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} else { |
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info->battery_status = APM_BATTERY_STATUS_HIGH; |
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info->battery_flag = APM_BATTERY_FLAG_HIGH; |
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} |
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} |
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info->battery_life = percentage; |
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info->time = time_units; |
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} |
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static int __init apm_emu_init(void) |
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{ |
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apm_get_power_status = pmu_apm_get_power_status; |
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printk(KERN_INFO "apm_emu: PMU APM Emulation initialized.\n"); |
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return 0; |
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} |
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static void __exit apm_emu_exit(void) |
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{ |
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if (apm_get_power_status == pmu_apm_get_power_status) |
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apm_get_power_status = NULL; |
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printk(KERN_INFO "apm_emu: PMU APM Emulation removed.\n"); |
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} |
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module_init(apm_emu_init); |
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module_exit(apm_emu_exit); |
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MODULE_AUTHOR("Benjamin Herrenschmidt"); |
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MODULE_DESCRIPTION("APM emulation for PowerMac"); |
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MODULE_LICENSE("GPL");
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