| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
|---|---|
| 2 | /* |
| 3 | * APM emulation for PMU-based machines |
| 4 | * |
| 5 | * Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org) |
| 6 | */ |
| 7 | |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/apm-emulation.h> |
| 11 | #include <linux/adb.h> |
| 12 | #include <linux/pmu.h> |
| 13 | |
| 14 | #define APM_CRITICAL 10 |
| 15 | #define APM_LOW 30 |
| 16 | |
| 17 | static void pmu_apm_get_power_status(struct apm_power_info *info) |
| 18 | { |
| 19 | int percentage = -1; |
| 20 | int batteries = 0; |
| 21 | int time_units = -1; |
| 22 | int real_count = 0; |
| 23 | int i; |
| 24 | char charging = 0; |
| 25 | long charge = -1; |
| 26 | long amperage = 0; |
| 27 | unsigned long btype = 0; |
| 28 | |
| 29 | info->battery_status = APM_BATTERY_STATUS_UNKNOWN; |
| 30 | info->battery_flag = APM_BATTERY_FLAG_UNKNOWN; |
| 31 | info->units = APM_UNITS_MINS; |
| 32 | |
| 33 | if (pmu_power_flags & PMU_PWR_AC_PRESENT) |
| 34 | info->ac_line_status = APM_AC_ONLINE; |
| 35 | else |
| 36 | info->ac_line_status = APM_AC_OFFLINE; |
| 37 | |
| 38 | for (i=0; i<pmu_battery_count; i++) { |
| 39 | if (pmu_batteries[i].flags & PMU_BATT_PRESENT) { |
| 40 | batteries++; |
| 41 | if (percentage < 0) |
| 42 | percentage = 0; |
| 43 | if (charge < 0) |
| 44 | charge = 0; |
| 45 | percentage += (pmu_batteries[i].charge * 100) / |
| 46 | pmu_batteries[i].max_charge; |
| 47 | charge += pmu_batteries[i].charge; |
| 48 | amperage += pmu_batteries[i].amperage; |
| 49 | if (btype == 0) |
| 50 | btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK); |
| 51 | real_count++; |
| 52 | if ((pmu_batteries[i].flags & PMU_BATT_CHARGING)) |
| 53 | charging++; |
| 54 | } |
| 55 | } |
| 56 | if (batteries == 0) |
| 57 | info->ac_line_status = APM_AC_ONLINE; |
| 58 | |
| 59 | if (real_count) { |
| 60 | if (amperage < 0) { |
| 61 | if (btype == PMU_BATT_TYPE_SMART) |
| 62 | time_units = (charge * 59) / (amperage * -1); |
| 63 | else |
| 64 | time_units = (charge * 16440) / (amperage * -60); |
| 65 | } |
| 66 | percentage /= real_count; |
| 67 | if (charging > 0) { |
| 68 | info->battery_status = APM_BATTERY_STATUS_CHARGING; |
| 69 | info->battery_flag = APM_BATTERY_FLAG_CHARGING; |
| 70 | } else if (percentage <= APM_CRITICAL) { |
| 71 | info->battery_status = APM_BATTERY_STATUS_CRITICAL; |
| 72 | info->battery_flag = APM_BATTERY_FLAG_CRITICAL; |
| 73 | } else if (percentage <= APM_LOW) { |
| 74 | info->battery_status = APM_BATTERY_STATUS_LOW; |
| 75 | info->battery_flag = APM_BATTERY_FLAG_LOW; |
| 76 | } else { |
| 77 | info->battery_status = APM_BATTERY_STATUS_HIGH; |
| 78 | info->battery_flag = APM_BATTERY_FLAG_HIGH; |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | info->battery_life = percentage; |
| 83 | info->time = time_units; |
| 84 | } |
| 85 | |
| 86 | static int __init apm_emu_init(void) |
| 87 | { |
| 88 | apm_get_power_status = pmu_apm_get_power_status; |
| 89 | |
| 90 | printk(KERN_INFO "apm_emu: PMU APM Emulation initialized.\n"); |
| 91 | |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static void __exit apm_emu_exit(void) |
| 96 | { |
| 97 | if (apm_get_power_status == pmu_apm_get_power_status) |
| 98 | apm_get_power_status = NULL; |
| 99 | |
| 100 | printk(KERN_INFO "apm_emu: PMU APM Emulation removed.\n"); |
| 101 | } |
| 102 | |
| 103 | module_init(apm_emu_init); |
| 104 | module_exit(apm_emu_exit); |
| 105 | |
| 106 | MODULE_AUTHOR("Benjamin Herrenschmidt"); |
| 107 | MODULE_DESCRIPTION("APM emulation for PowerMac"); |
| 108 | MODULE_LICENSE("GPL"); |
| 109 |