Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-apm
[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/kernel.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/apm-emulation.h>
14 #include <linux/io.h>
15 #include <asm/adc.h>
16 #include <asm/hp6xx.h>
17
18 #define SH7709_PGDR                     0xa400012c
19
20 #define APM_CRITICAL                    10
21 #define APM_LOW                         30
22
23 #define HP680_BATTERY_MAX               875
24 #define HP680_BATTERY_MIN               600
25 #define HP680_BATTERY_AC_ON             900
26
27 #define MODNAME "hp6x0_apm"
28
29 static void hp6x0_apm_get_power_status(struct apm_power_info *info)
30 {
31         int battery, backup, charging, percentage;
32         u8 pgdr;
33
34         battery         = adc_single(ADC_CHANNEL_BATTERY);
35         backup          = adc_single(ADC_CHANNEL_BACKUP);
36         charging        = adc_single(ADC_CHANNEL_CHARGE);
37
38         percentage = 100 * (battery - HP680_BATTERY_MIN) /
39                            (HP680_BATTERY_MAX - HP680_BATTERY_MIN);
40
41         info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
42                          APM_AC_ONLINE : APM_AC_OFFLINE;
43
44         pgdr = ctrl_inb(SH7709_PGDR);
45         if (pgdr & PGDR_MAIN_BATTERY_OUT) {
46                 info->battery_status    = APM_BATTERY_STATUS_NOT_PRESENT;
47                 info->battery_flag      = 0x80;
48         } else if (charging < 8) {
49                 info->battery_status    = APM_BATTERY_STATUS_CHARGING;
50                 info->battery_flag      = 0x08;
51                 info->ac_line_status = 0xff;
52         } else if (percentage <= APM_CRITICAL) {
53                 info->battery_status    = APM_BATTERY_STATUS_CRITICAL;
54                 info->battery_flag      = 0x04;
55         } else if (percentage <= APM_LOW) {
56                 info->battery_status    = APM_BATTERY_STATUS_LOW;
57                 info->battery_flag      = 0x02;
58         } else {
59                 info->battery_status    = APM_BATTERY_STATUS_HIGH;
60                 info->battery_flag      = 0x01;
61         }
62
63         info->units = 0;
64 }
65
66 static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)
67 {
68         if (!apm_suspended)
69                 apm_queue_event(APM_USER_SUSPEND);
70
71         return IRQ_HANDLED;
72 }
73
74 static int __init hp6x0_apm_init(void)
75 {
76         int ret;
77
78         ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt,
79                           IRQF_DISABLED, MODNAME, NULL);
80         if (unlikely(ret < 0)) {
81                 printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
82                        HP680_BTN_IRQ);
83                 return ret;
84         }
85
86         apm_get_power_status = hp6x0_apm_get_power_status;
87
88         return ret;
89 }
90
91 static void __exit hp6x0_apm_exit(void)
92 {
93         free_irq(HP680_BTN_IRQ, 0);
94         apm_get_info = NULL;
95 }
96
97 module_init(hp6x0_apm_init);
98 module_exit(hp6x0_apm_exit);
99
100 MODULE_AUTHOR("Adriy Skulysh");
101 MODULE_DESCRIPTION("hp6xx Advanced Power Management");
102 MODULE_LICENSE("GPL");