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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