2 * bios-less APM driver for hp680
4 * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License.
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>
17 #include <asm/hp6xx/hp6xx.h>
19 #define SH7709_PGDR 0xa400012c
21 #define APM_CRITICAL 10
24 #define HP680_BATTERY_MAX 875
25 #define HP680_BATTERY_MIN 600
26 #define HP680_BATTERY_AC_ON 900
28 #define MODNAME "hp6x0_apm"
30 static int hp6x0_apm_get_info(char *buf
, char **start
, off_t fpos
, int length
)
37 int time_units
= APM_BATTERY_LIFE_UNKNOWN
;
39 int battery
= adc_single(ADC_CHANNEL_BATTERY
);
40 int backup
= adc_single(ADC_CHANNEL_BACKUP
);
41 int charging
= adc_single(ADC_CHANNEL_CHARGE
);
44 percentage
= 100 * (battery
- HP680_BATTERY_MIN
) /
45 (HP680_BATTERY_MAX
- HP680_BATTERY_MIN
);
47 ac_line_status
= (battery
> HP680_BATTERY_AC_ON
) ?
48 APM_AC_ONLINE
: APM_AC_OFFLINE
;
52 pgdr
= ctrl_inb(SH7709_PGDR
);
53 if (pgdr
& PGDR_MAIN_BATTERY_OUT
) {
54 battery_status
= APM_BATTERY_STATUS_NOT_PRESENT
;
57 } else if (charging
< 8 ) {
58 battery_status
= APM_BATTERY_STATUS_CHARGING
;
60 ac_line_status
= 0xff;
61 } else if (percentage
<= APM_CRITICAL
) {
62 battery_status
= APM_BATTERY_STATUS_CRITICAL
;
64 } else if (percentage
<= APM_LOW
) {
65 battery_status
= APM_BATTERY_STATUS_LOW
;
68 battery_status
= APM_BATTERY_STATUS_HIGH
;
72 p
+= sprintf(p
, "1.0 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
80 p
+= sprintf(p
, "bat=%d backup=%d charge=%d\n",
81 battery
, backup
, charging
);
86 static irqreturn_t
hp6x0_apm_interrupt(int irq
, void *dev
, struct pt_regs
*regs
)
89 apm_queue_event(APM_USER_SUSPEND
);
94 static int __init
hp6x0_apm_init(void)
98 ret
= request_irq(HP680_BTN_IRQ
, hp6x0_apm_interrupt
,
99 SA_INTERRUPT
, MODNAME
, 0);
100 if (unlikely(ret
< 0)) {
101 printk(KERN_ERR MODNAME
": IRQ %d request failed\n",
106 apm_get_info
= hp6x0_apm_get_info
;
111 static void __exit
hp6x0_apm_exit(void)
113 free_irq(HP680_BTN_IRQ
, 0);
117 module_init(hp6x0_apm_init
);
118 module_exit(hp6x0_apm_exit
);
120 MODULE_AUTHOR("Adriy Skulysh");
121 MODULE_DESCRIPTION("hp6xx Advanced Power Management");
122 MODULE_LICENSE("GPL");