[PATCH] SH vdso: use install_special_mapping()
[sfrench/cifs-2.6.git] / arch / sh / boards / hp6xx / hp6xx_apm.c
1 /*
2  * bios-less APM driver for hp680
3  *
4  * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License.
8  */
9 #include <linux/module.h>
10 #include <linux/apm_bios.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <asm/io.h>
15 #include <asm/apm.h>
16 #include <asm/adc.h>
17 #include <asm/hp6xx.h>
18
19 #define SH7709_PGDR                     0xa400012c
20
21 #define APM_CRITICAL                    10
22 #define APM_LOW                         30
23
24 #define HP680_BATTERY_MAX               875
25 #define HP680_BATTERY_MIN               600
26 #define HP680_BATTERY_AC_ON             900
27
28 #define MODNAME "hp6x0_apm"
29
30 static int hp6x0_apm_get_info(char *buf, char **start, off_t fpos, int length)
31 {
32         u8 pgdr;
33         char *p;
34         int battery_status;
35         int battery_flag;
36         int ac_line_status;
37         int time_units = APM_BATTERY_LIFE_UNKNOWN;
38
39         int battery = adc_single(ADC_CHANNEL_BATTERY);
40         int backup = adc_single(ADC_CHANNEL_BACKUP);
41         int charging = adc_single(ADC_CHANNEL_CHARGE);
42         int percentage;
43
44         percentage = 100 * (battery - HP680_BATTERY_MIN) /
45                            (HP680_BATTERY_MAX - HP680_BATTERY_MIN);
46
47         ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
48                          APM_AC_ONLINE : APM_AC_OFFLINE;
49
50         p = buf;
51
52         pgdr = ctrl_inb(SH7709_PGDR);
53         if (pgdr & PGDR_MAIN_BATTERY_OUT) {
54                 battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
55                 battery_flag = 0x80;
56                 percentage = -1;
57         } else if (charging < 8 ) {
58                 battery_status = APM_BATTERY_STATUS_CHARGING;
59                 battery_flag = 0x08;
60                 ac_line_status = 0xff;
61         } else if (percentage <= APM_CRITICAL) {
62                 battery_status = APM_BATTERY_STATUS_CRITICAL;
63                 battery_flag = 0x04;
64         } else if (percentage <= APM_LOW) {
65                 battery_status = APM_BATTERY_STATUS_LOW;
66                 battery_flag = 0x02;
67         } else {
68                 battery_status = APM_BATTERY_STATUS_HIGH;
69                 battery_flag = 0x01;
70         }
71
72         p += sprintf(p, "1.0 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
73                      APM_32_BIT_SUPPORT,
74                      ac_line_status,
75                      battery_status,
76                      battery_flag,
77                      percentage,
78                      time_units,
79                      "min");
80         p += sprintf(p, "bat=%d backup=%d charge=%d\n",
81                      battery, backup, charging);
82
83         return p - buf;
84 }
85
86 static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)
87 {
88         if (!apm_suspended)
89                 apm_queue_event(APM_USER_SUSPEND);
90
91         return IRQ_HANDLED;
92 }
93
94 static int __init hp6x0_apm_init(void)
95 {
96         int ret;
97
98         ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt,
99                           IRQF_DISABLED, MODNAME, 0);
100         if (unlikely(ret < 0)) {
101                 printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
102                        HP680_BTN_IRQ);
103                 return ret;
104         }
105
106         apm_get_info = hp6x0_apm_get_info;
107
108         return ret;
109 }
110
111 static void __exit hp6x0_apm_exit(void)
112 {
113         free_irq(HP680_BTN_IRQ, 0);
114         apm_get_info = 0;
115 }
116
117 module_init(hp6x0_apm_init);
118 module_exit(hp6x0_apm_exit);
119
120 MODULE_AUTHOR("Adriy Skulysh");
121 MODULE_DESCRIPTION("hp6xx Advanced Power Management");
122 MODULE_LICENSE("GPL");