cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hp6xx_apm.c (2690B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * bios-less APM driver for hp680
      4 *
      5 * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>
      6 * Copyright 2008 (c) Kristoffer Ericson <kristoffer.ericson@gmail.com>
      7 */
      8#include <linux/module.h>
      9#include <linux/kernel.h>
     10#include <linux/init.h>
     11#include <linux/interrupt.h>
     12#include <linux/apm-emulation.h>
     13#include <linux/io.h>
     14#include <asm/adc.h>
     15#include <mach/hp6xx.h>
     16
     17/* percentage values */
     18#define APM_CRITICAL			10
     19#define APM_LOW				30
     20
     21/* resonably sane values */
     22#define HP680_BATTERY_MAX		898
     23#define HP680_BATTERY_MIN		486
     24#define HP680_BATTERY_AC_ON		1023
     25
     26#define MODNAME "hp6x0_apm"
     27
     28#define PGDR	0xa400012c
     29
     30static void hp6x0_apm_get_power_status(struct apm_power_info *info)
     31{
     32	int battery, backup, charging, percentage;
     33	u8 pgdr;
     34
     35	battery		= adc_single(ADC_CHANNEL_BATTERY);
     36	backup		= adc_single(ADC_CHANNEL_BACKUP);
     37	charging	= adc_single(ADC_CHANNEL_CHARGE);
     38
     39	percentage = 100 * (battery - HP680_BATTERY_MIN) /
     40			   (HP680_BATTERY_MAX - HP680_BATTERY_MIN);
     41
     42	/* % of full battery */
     43	info->battery_life = percentage;
     44
     45	/* We want our estimates in minutes */
     46	info->units = 0;
     47
     48	/* Extremely(!!) rough estimate, we will replace this with a datalist later on */
     49	info->time = (2 * battery);
     50
     51	info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
     52			 APM_AC_ONLINE : APM_AC_OFFLINE;
     53
     54	pgdr = __raw_readb(PGDR);
     55	if (pgdr & PGDR_MAIN_BATTERY_OUT) {
     56		info->battery_status	= APM_BATTERY_STATUS_NOT_PRESENT;
     57		info->battery_flag	= 0x80;
     58	} else if (charging < 8) {
     59		info->battery_status	= APM_BATTERY_STATUS_CHARGING;
     60		info->battery_flag	= 0x08;
     61		info->ac_line_status	= 0x01;
     62	} else if (percentage <= APM_CRITICAL) {
     63		info->battery_status	= APM_BATTERY_STATUS_CRITICAL;
     64		info->battery_flag	= 0x04;
     65	} else if (percentage <= APM_LOW) {
     66		info->battery_status	= APM_BATTERY_STATUS_LOW;
     67		info->battery_flag	= 0x02;
     68	} else {
     69		info->battery_status	= APM_BATTERY_STATUS_HIGH;
     70		info->battery_flag	= 0x01;
     71	}
     72}
     73
     74static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)
     75{
     76	if (!APM_DISABLED)
     77		apm_queue_event(APM_USER_SUSPEND);
     78
     79	return IRQ_HANDLED;
     80}
     81
     82static int __init hp6x0_apm_init(void)
     83{
     84	int ret;
     85
     86	ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt,
     87			  0, MODNAME, NULL);
     88	if (unlikely(ret < 0)) {
     89		printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
     90		       HP680_BTN_IRQ);
     91		return ret;
     92	}
     93
     94	apm_get_power_status = hp6x0_apm_get_power_status;
     95
     96	return ret;
     97}
     98
     99static void __exit hp6x0_apm_exit(void)
    100{
    101	free_irq(HP680_BTN_IRQ, 0);
    102}
    103
    104module_init(hp6x0_apm_init);
    105module_exit(hp6x0_apm_exit);
    106
    107MODULE_AUTHOR("Adriy Skulysh");
    108MODULE_DESCRIPTION("hp6xx Advanced Power Management");
    109MODULE_LICENSE("GPL");