/* * bios-less APM driver for hp680 * * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com> * Copyright 2008 (c) Kristoffer Ericson <kristoffer.ericson@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> /* percentage values */ #define APM_CRITICAL 10 #define APM_LOW 30 /* resonably sane values */ #define HP680_BATTERY_MAX 898 #define HP680_BATTERY_MIN 486 #define HP680_BATTERY_AC_ON 1023 #define MODNAME "hp6x0_apm" #define PGDR 0xa400012c 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); /* % of full battery */ info->battery_life = percentage; /* We want our estimates in minutes */ info->units = 0; /* Extremely(!!) rough estimate, we will replace this with a datalist later on */ info->time = (2 * battery); info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ? APM_AC_ONLINE : APM_AC_OFFLINE; pgdr = ctrl_inb(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 = 0x01; } 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; } } 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");