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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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