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 |