[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / macintosh / apm_emu.c

/*
 * APM emulation for PMU-based machines
 *
 * Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org)
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/apm-emulation.h>
#include <linux/adb.h>
#include <linux/pmu.h>

#define APM_CRITICAL		10
#define APM_LOW			30

static void pmu_apm_get_power_status(struct apm_power_info *info)
{
	int percentage = -1;
	int batteries = 0;
	int time_units = -1;
	int real_count = 0;
	int i;
	char charging = 0;
	long charge = -1;
	long amperage = 0;
	unsigned long btype = 0;

	info->battery_status = APM_BATTERY_STATUS_UNKNOWN;
	info->battery_flag = APM_BATTERY_FLAG_UNKNOWN;
	info->units = APM_UNITS_MINS;

	if (pmu_power_flags & PMU_PWR_AC_PRESENT)
		info->ac_line_status = APM_AC_ONLINE;
	else
		info->ac_line_status = APM_AC_OFFLINE;

	for (i=0; i<pmu_battery_count; i++) {
		if (pmu_batteries[i].flags & PMU_BATT_PRESENT) {
			batteries++;
			if (percentage < 0)
				percentage = 0;
			if (charge < 0)
				charge = 0;
			percentage += (pmu_batteries[i].charge * 100) /
				pmu_batteries[i].max_charge;
			charge += pmu_batteries[i].charge;
			amperage += pmu_batteries[i].amperage;
			if (btype == 0)
				btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK);
			real_count++;
			if ((pmu_batteries[i].flags & PMU_BATT_CHARGING))
				charging++;
		}
	}
	if (batteries == 0)
		info->ac_line_status = APM_AC_ONLINE;

	if (real_count) {
		if (amperage < 0) {
			if (btype == PMU_BATT_TYPE_SMART)
				time_units = (charge * 59) / (amperage * -1);
			else
				time_units = (charge * 16440) / (amperage * -60);
		}
		percentage /= real_count;
		if (charging > 0) {
			info->battery_status = APM_BATTERY_STATUS_CHARGING;
			info->battery_flag = APM_BATTERY_FLAG_CHARGING;
		} else if (percentage <= APM_CRITICAL) {
			info->battery_status = APM_BATTERY_STATUS_CRITICAL;
			info->battery_flag = APM_BATTERY_FLAG_CRITICAL;
		} else if (percentage <= APM_LOW) {
			info->battery_status = APM_BATTERY_STATUS_LOW;
			info->battery_flag = APM_BATTERY_FLAG_LOW;
		} else {
			info->battery_status = APM_BATTERY_STATUS_HIGH;
			info->battery_flag = APM_BATTERY_FLAG_HIGH;
		}
	}

	info->battery_life = percentage;
	info->time = time_units;
}

static int __init apm_emu_init(void)
{
	apm_get_power_status = pmu_apm_get_power_status;

	printk(KERN_INFO "apm_emu: PMU APM Emulation initialized.\n");

	return 0;
}

static void __exit apm_emu_exit(void)
{
	if (apm_get_power_status == pmu_apm_get_power_status)
		apm_get_power_status = NULL;

	printk(KERN_INFO "apm_emu: PMU APM Emulation removed.\n");
}

module_init(apm_emu_init);
module_exit(apm_emu_exit);

MODULE_AUTHOR("Benjamin Herrenschmidt");
MODULE_DESCRIPTION("APM emulation for PowerMac");
MODULE_LICENSE("GPL");
Commit	Line	Data
b3028878 JB	1	/*
b3028878 JB	2	* APM emulation for PMU-based machines
1da177e4	3	*
b3028878	4	* Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org)
1da177e4 LT	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2, or (at your option) any
	9	* later version.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	*
	17	*/
	18
1da177e4	19	#include <linux/kernel.h>
b3028878 JB	20	#include <linux/module.h>
b3028878 JB	21	#include <linux/apm-emulation.h>
1da177e4 LT	22	#include <linux/adb.h>
	23	#include <linux/pmu.h>
	24
1da177e4 LT	25	#define APM_CRITICAL 10
	26	#define APM_LOW 30
	27
b3028878	28	static void pmu_apm_get_power_status(struct apm_power_info *info)
1da177e4	29	{
b3028878 JB	30	int percentage = -1;
	31	int batteries = 0;
	32	int time_units = -1;
	33	int real_count = 0;
	34	int i;
	35	char charging = 0;
	36	long charge = -1;
	37	long amperage = 0;
	38	unsigned long btype = 0;
	39
	40	info->battery_status = APM_BATTERY_STATUS_UNKNOWN;
	41	info->battery_flag = APM_BATTERY_FLAG_UNKNOWN;
	42	info->units = APM_UNITS_MINS;
	43
	44	if (pmu_power_flags & PMU_PWR_AC_PRESENT)
	45	info->ac_line_status = APM_AC_ONLINE;
	46	else
	47	info->ac_line_status = APM_AC_OFFLINE;
1da177e4	48
1da177e4 LT	49	for (i=0; i<pmu_battery_count; i++) {
1da177e4 LT	50	if (pmu_batteries[i].flags & PMU_BATT_PRESENT) {
b3028878	51	batteries++;
1da177e4 LT	52	if (percentage < 0)
	53	percentage = 0;
	54	if (charge < 0)
	55	charge = 0;
	56	percentage += (pmu_batteries[i].charge * 100) /
	57	pmu_batteries[i].max_charge;
	58	charge += pmu_batteries[i].charge;
	59	amperage += pmu_batteries[i].amperage;
	60	if (btype == 0)
	61	btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK);
	62	real_count++;
	63	if ((pmu_batteries[i].flags & PMU_BATT_CHARGING))
	64	charging++;
	65	}
	66	}
b3028878 JB	67	if (batteries == 0)
	68	info->ac_line_status = APM_AC_ONLINE;
	69
1da177e4 LT	70	if (real_count) {
	71	if (amperage < 0) {
	72	if (btype == PMU_BATT_TYPE_SMART)
	73	time_units = (charge * 59) / (amperage * -1);
	74	else
	75	time_units = (charge * 16440) / (amperage * -60);
	76	}
	77	percentage /= real_count;
	78	if (charging > 0) {
b3028878 JB	79	info->battery_status = APM_BATTERY_STATUS_CHARGING;
b3028878 JB	80	info->battery_flag = APM_BATTERY_FLAG_CHARGING;
1da177e4	81	} else if (percentage <= APM_CRITICAL) {
b3028878 JB	82	info->battery_status = APM_BATTERY_STATUS_CRITICAL;
b3028878 JB	83	info->battery_flag = APM_BATTERY_FLAG_CRITICAL;
1da177e4	84	} else if (percentage <= APM_LOW) {
b3028878 JB	85	info->battery_status = APM_BATTERY_STATUS_LOW;
b3028878 JB	86	info->battery_flag = APM_BATTERY_FLAG_LOW;
1da177e4	87	} else {
b3028878 JB	88	info->battery_status = APM_BATTERY_STATUS_HIGH;
b3028878 JB	89	info->battery_flag = APM_BATTERY_FLAG_HIGH;
1da177e4 LT	90	}
1da177e4 LT	91	}
1da177e4	92
b3028878 JB	93	info->battery_life = percentage;
b3028878 JB	94	info->time = time_units;
1da177e4 LT	95	}
1da177e4 LT	96
1da177e4 LT	97	static int __init apm_emu_init(void)
1da177e4 LT	98	{
b3028878	99	apm_get_power_status = pmu_apm_get_power_status;
1da177e4	100
b3028878	101	printk(KERN_INFO "apm_emu: PMU APM Emulation initialized.\n");
1da177e4 LT	102
	103	return 0;
	104	}
	105
	106	static void __exit apm_emu_exit(void)
	107	{
b3028878 JB	108	if (apm_get_power_status == pmu_apm_get_power_status)
b3028878 JB	109	apm_get_power_status = NULL;
1da177e4	110
b3028878	111	printk(KERN_INFO "apm_emu: PMU APM Emulation removed.\n");
1da177e4 LT	112	}
	113
	114	module_init(apm_emu_init);
	115	module_exit(apm_emu_exit);
	116
	117	MODULE_AUTHOR("Benjamin Herrenschmidt");
b3028878	118	MODULE_DESCRIPTION("APM emulation for PowerMac");
1da177e4	119	MODULE_LICENSE("GPL");