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109 lines
2.6 KiB
109 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* bios-less APM driver for hp680 |
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* |
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* Copyright 2005 (c) Andriy Skulysh <[email protected]> |
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* Copyright 2008 (c) Kristoffer Ericson <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/apm-emulation.h> |
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#include <linux/io.h> |
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#include <asm/adc.h> |
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#include <mach/hp6xx.h> |
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/* percentage values */ |
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#define APM_CRITICAL 10 |
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#define APM_LOW 30 |
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/* resonably sane values */ |
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#define HP680_BATTERY_MAX 898 |
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#define HP680_BATTERY_MIN 486 |
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#define HP680_BATTERY_AC_ON 1023 |
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#define MODNAME "hp6x0_apm" |
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#define PGDR 0xa400012c |
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static void hp6x0_apm_get_power_status(struct apm_power_info *info) |
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{ |
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int battery, backup, charging, percentage; |
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u8 pgdr; |
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battery = adc_single(ADC_CHANNEL_BATTERY); |
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backup = adc_single(ADC_CHANNEL_BACKUP); |
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charging = adc_single(ADC_CHANNEL_CHARGE); |
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percentage = 100 * (battery - HP680_BATTERY_MIN) / |
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(HP680_BATTERY_MAX - HP680_BATTERY_MIN); |
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/* % of full battery */ |
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info->battery_life = percentage; |
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/* We want our estimates in minutes */ |
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info->units = 0; |
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/* Extremely(!!) rough estimate, we will replace this with a datalist later on */ |
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info->time = (2 * battery); |
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info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ? |
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APM_AC_ONLINE : APM_AC_OFFLINE; |
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pgdr = __raw_readb(PGDR); |
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if (pgdr & PGDR_MAIN_BATTERY_OUT) { |
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info->battery_status = APM_BATTERY_STATUS_NOT_PRESENT; |
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info->battery_flag = 0x80; |
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} else if (charging < 8) { |
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info->battery_status = APM_BATTERY_STATUS_CHARGING; |
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info->battery_flag = 0x08; |
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info->ac_line_status = 0x01; |
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} else if (percentage <= APM_CRITICAL) { |
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info->battery_status = APM_BATTERY_STATUS_CRITICAL; |
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info->battery_flag = 0x04; |
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} else if (percentage <= APM_LOW) { |
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info->battery_status = APM_BATTERY_STATUS_LOW; |
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info->battery_flag = 0x02; |
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} else { |
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info->battery_status = APM_BATTERY_STATUS_HIGH; |
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info->battery_flag = 0x01; |
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} |
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} |
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static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev) |
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{ |
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if (!APM_DISABLED) |
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apm_queue_event(APM_USER_SUSPEND); |
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return IRQ_HANDLED; |
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} |
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static int __init hp6x0_apm_init(void) |
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{ |
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int ret; |
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ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt, |
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0, MODNAME, NULL); |
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if (unlikely(ret < 0)) { |
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printk(KERN_ERR MODNAME ": IRQ %d request failed\n", |
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HP680_BTN_IRQ); |
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return ret; |
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} |
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apm_get_power_status = hp6x0_apm_get_power_status; |
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return ret; |
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} |
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static void __exit hp6x0_apm_exit(void) |
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{ |
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free_irq(HP680_BTN_IRQ, 0); |
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} |
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module_init(hp6x0_apm_init); |
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module_exit(hp6x0_apm_exit); |
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MODULE_AUTHOR("Adriy Skulysh"); |
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MODULE_DESCRIPTION("hp6xx Advanced Power Management"); |
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MODULE_LICENSE("GPL");
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