1/* 2 * bios-less APM driver for hp680 3 * 4 * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com> 5 * Copyright 2008 (c) Kristoffer Ericson <kristoffer.ericson@gmail.com> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License. 9 */ 10#include <linux/module.h> 11#include <linux/kernel.h> 12#include <linux/init.h> 13#include <linux/interrupt.h> 14#include <linux/apm-emulation.h> 15#include <linux/io.h> 16#include <asm/adc.h> 17#include <mach/hp6xx.h> 18 19/* percentage values */ 20#define APM_CRITICAL 10 21#define APM_LOW 30 22 23/* resonably sane values */ 24#define HP680_BATTERY_MAX 898 25#define HP680_BATTERY_MIN 486 26#define HP680_BATTERY_AC_ON 1023 27 28#define MODNAME "hp6x0_apm" 29 30#define PGDR 0xa400012c 31 32static void hp6x0_apm_get_power_status(struct apm_power_info *info) 33{ 34 int battery, backup, charging, percentage; 35 u8 pgdr; 36 37 battery = adc_single(ADC_CHANNEL_BATTERY); 38 backup = adc_single(ADC_CHANNEL_BACKUP); 39 charging = adc_single(ADC_CHANNEL_CHARGE); 40 41 percentage = 100 * (battery - HP680_BATTERY_MIN) / 42 (HP680_BATTERY_MAX - HP680_BATTERY_MIN); 43 44 /* % of full battery */ 45 info->battery_life = percentage; 46 47 /* We want our estimates in minutes */ 48 info->units = 0; 49 50 /* Extremely(!!) rough estimate, we will replace this with a datalist later on */ 51 info->time = (2 * battery); 52 53 info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ? 54 APM_AC_ONLINE : APM_AC_OFFLINE; 55 56 pgdr = __raw_readb(PGDR); 57 if (pgdr & PGDR_MAIN_BATTERY_OUT) { 58 info->battery_status = APM_BATTERY_STATUS_NOT_PRESENT; 59 info->battery_flag = 0x80; 60 } else if (charging < 8) { 61 info->battery_status = APM_BATTERY_STATUS_CHARGING; 62 info->battery_flag = 0x08; 63 info->ac_line_status = 0x01; 64 } else if (percentage <= APM_CRITICAL) { 65 info->battery_status = APM_BATTERY_STATUS_CRITICAL; 66 info->battery_flag = 0x04; 67 } else if (percentage <= APM_LOW) { 68 info->battery_status = APM_BATTERY_STATUS_LOW; 69 info->battery_flag = 0x02; 70 } else { 71 info->battery_status = APM_BATTERY_STATUS_HIGH; 72 info->battery_flag = 0x01; 73 } 74} 75 76static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev) 77{ 78 if (!APM_DISABLED) 79 apm_queue_event(APM_USER_SUSPEND); 80 81 return IRQ_HANDLED; 82} 83 84static int __init hp6x0_apm_init(void) 85{ 86 int ret; 87 88 ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt, 89 IRQF_DISABLED, MODNAME, NULL); 90 if (unlikely(ret < 0)) { 91 printk(KERN_ERR MODNAME ": IRQ %d request failed\n", 92 HP680_BTN_IRQ); 93 return ret; 94 } 95 96 apm_get_power_status = hp6x0_apm_get_power_status; 97 98 return ret; 99} 100 101static void __exit hp6x0_apm_exit(void) 102{ 103 free_irq(HP680_BTN_IRQ, 0); 104} 105 106module_init(hp6x0_apm_init); 107module_exit(hp6x0_apm_exit); 108 109MODULE_AUTHOR("Adriy Skulysh"); 110MODULE_DESCRIPTION("hp6xx Advanced Power Management"); 111MODULE_LICENSE("GPL"); 112