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hp6xx_apm.c

/*
 * 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/apm-emulation.h>
#include <linux/io.h>
#include <asm/adc.h>
#include <asm/hp6xx.h>

#define SH7709_PGDR                 0xa400012c

#define APM_CRITICAL                10
#define APM_LOW                     30

#define HP680_BATTERY_MAX           898
#define HP680_BATTERY_MIN           486
#define HP680_BATTERY_AC_ON         1023

#define MODNAME "hp6x0_apm"

static void hp6x0_apm_get_power_status(struct apm_power_info *info)
{
      int battery, backup, charging, percentage;
      u8 pgdr;

      battery           = adc_single(ADC_CHANNEL_BATTERY);
      backup            = adc_single(ADC_CHANNEL_BACKUP);
      charging    = adc_single(ADC_CHANNEL_CHARGE);

      percentage = 100 * (battery - HP680_BATTERY_MIN) /
                     (HP680_BATTERY_MAX - HP680_BATTERY_MIN);

      info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
                   APM_AC_ONLINE : APM_AC_OFFLINE;

      pgdr = ctrl_inb(SH7709_PGDR);
      if (pgdr & PGDR_MAIN_BATTERY_OUT) {
            info->battery_status    = APM_BATTERY_STATUS_NOT_PRESENT;
            info->battery_flag      = 0x80;
      } else if (charging < 8) {
            info->battery_status    = APM_BATTERY_STATUS_CHARGING;
            info->battery_flag      = 0x08;
            info->ac_line_status = 0xff;
      } else if (percentage <= APM_CRITICAL) {
            info->battery_status    = APM_BATTERY_STATUS_CRITICAL;
            info->battery_flag      = 0x04;
      } else if (percentage <= APM_LOW) {
            info->battery_status    = APM_BATTERY_STATUS_LOW;
            info->battery_flag      = 0x02;
      } else {
            info->battery_status    = APM_BATTERY_STATUS_HIGH;
            info->battery_flag      = 0x01;
      }

      info->units = 0;
}

static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)
{
      if (!APM_DISABLED)
            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,
                    IRQF_DISABLED, MODNAME, NULL);
      if (unlikely(ret < 0)) {
            printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
                   HP680_BTN_IRQ);
            return ret;
      }

      apm_get_power_status = hp6x0_apm_get_power_status;

      return ret;
}

static void __exit hp6x0_apm_exit(void)
{
      free_irq(HP680_BTN_IRQ, 0);
}

module_init(hp6x0_apm_init);
module_exit(hp6x0_apm_exit);

MODULE_AUTHOR("Adriy Skulysh");
MODULE_DESCRIPTION("hp6xx Advanced Power Management");
MODULE_LICENSE("GPL");

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