| /* |
| * bios-less APM driver for hp680 |
| * |
| * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License. |
| */ |
| #include <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/apm_bios.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <asm/io.h> |
| #include <asm/apm.h> |
| #include <asm/adc.h> |
| #include <asm/hp6xx/hp6xx.h> |
| |
| #define SH7709_PGDR 0xa400012c |
| |
| #define APM_CRITICAL 10 |
| #define APM_LOW 30 |
| |
| #define HP680_BATTERY_MAX 875 |
| #define HP680_BATTERY_MIN 600 |
| #define HP680_BATTERY_AC_ON 900 |
| |
| #define MODNAME "hp6x0_apm" |
| |
| static int hp6x0_apm_get_info(char *buf, char **start, off_t fpos, int length) |
| { |
| u8 pgdr; |
| char *p; |
| int battery_status; |
| int battery_flag; |
| int ac_line_status; |
| int time_units = APM_BATTERY_LIFE_UNKNOWN; |
| |
| int battery = adc_single(ADC_CHANNEL_BATTERY); |
| int backup = adc_single(ADC_CHANNEL_BACKUP); |
| int charging = adc_single(ADC_CHANNEL_CHARGE); |
| int percentage; |
| |
| percentage = 100 * (battery - HP680_BATTERY_MIN) / |
| (HP680_BATTERY_MAX - HP680_BATTERY_MIN); |
| |
| ac_line_status = (battery > HP680_BATTERY_AC_ON) ? |
| APM_AC_ONLINE : APM_AC_OFFLINE; |
| |
| p = buf; |
| |
| pgdr = ctrl_inb(SH7709_PGDR); |
| if (pgdr & PGDR_MAIN_BATTERY_OUT) { |
| battery_status = APM_BATTERY_STATUS_NOT_PRESENT; |
| battery_flag = 0x80; |
| percentage = -1; |
| } else if (charging < 8 ) { |
| battery_status = APM_BATTERY_STATUS_CHARGING; |
| battery_flag = 0x08; |
| ac_line_status = 0xff; |
| } else if (percentage <= APM_CRITICAL) { |
| battery_status = APM_BATTERY_STATUS_CRITICAL; |
| battery_flag = 0x04; |
| } else if (percentage <= APM_LOW) { |
| battery_status = APM_BATTERY_STATUS_LOW; |
| battery_flag = 0x02; |
| } else { |
| battery_status = APM_BATTERY_STATUS_HIGH; |
| battery_flag = 0x01; |
| } |
| |
| p += sprintf(p, "1.0 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", |
| APM_32_BIT_SUPPORT, |
| ac_line_status, |
| battery_status, |
| battery_flag, |
| percentage, |
| time_units, |
| "min"); |
| p += sprintf(p, "bat=%d backup=%d charge=%d\n", |
| battery, backup, charging); |
| |
| return p - buf; |
| } |
| |
| static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev, struct pt_regs *regs) |
| { |
| if (!apm_suspended) |
| apm_queue_event(APM_USER_SUSPEND); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int __init hp6x0_apm_init(void) |
| { |
| int ret; |
| |
| ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt, |
| SA_INTERRUPT, MODNAME, 0); |
| if (unlikely(ret < 0)) { |
| printk(KERN_ERR MODNAME ": IRQ %d request failed\n", |
| HP680_BTN_IRQ); |
| return ret; |
| } |
| |
| apm_get_info = hp6x0_apm_get_info; |
| |
| return ret; |
| } |
| |
| static void __exit hp6x0_apm_exit(void) |
| { |
| free_irq(HP680_BTN_IRQ, 0); |
| apm_get_info = 0; |
| } |
| |
| module_init(hp6x0_apm_init); |
| module_exit(hp6x0_apm_exit); |
| |
| MODULE_AUTHOR("Adriy Skulysh"); |
| MODULE_DESCRIPTION("hp6xx Advanced Power Management"); |
| MODULE_LICENSE("GPL"); |