[linux-2.6-block.git] / drivers / macintosh / apm_emu.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * APM emulation for PMU-based machines
 *
 * Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org)
 */

#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
3e0a4e85	1	// SPDX-License-Identifier: GPL-2.0-or-later
b3028878 JB	2	/*
b3028878 JB	3	* APM emulation for PMU-based machines
1da177e4	4	*
b3028878	5	* Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org)
1da177e4 LT	6	*/
1da177e4 LT	7
1da177e4	8	#include <linux/kernel.h>
b3028878 JB	9	#include <linux/module.h>
b3028878 JB	10	#include <linux/apm-emulation.h>
1da177e4 LT	11	#include <linux/adb.h>
	12	#include <linux/pmu.h>
	13
1da177e4 LT	14	#define APM_CRITICAL 10
	15	#define APM_LOW 30
	16
b3028878	17	static void pmu_apm_get_power_status(struct apm_power_info *info)
1da177e4	18	{
b3028878 JB	19	int percentage = -1;
	20	int batteries = 0;
	21	int time_units = -1;
	22	int real_count = 0;
	23	int i;
	24	char charging = 0;
	25	long charge = -1;
	26	long amperage = 0;
	27	unsigned long btype = 0;
	28
	29	info->battery_status = APM_BATTERY_STATUS_UNKNOWN;
	30	info->battery_flag = APM_BATTERY_FLAG_UNKNOWN;
	31	info->units = APM_UNITS_MINS;
	32
	33	if (pmu_power_flags & PMU_PWR_AC_PRESENT)
	34	info->ac_line_status = APM_AC_ONLINE;
	35	else
	36	info->ac_line_status = APM_AC_OFFLINE;
1da177e4	37
1da177e4 LT	38	for (i=0; i<pmu_battery_count; i++) {
1da177e4 LT	39	if (pmu_batteries[i].flags & PMU_BATT_PRESENT) {
b3028878	40	batteries++;
1da177e4 LT	41	if (percentage < 0)
	42	percentage = 0;
	43	if (charge < 0)
	44	charge = 0;
	45	percentage += (pmu_batteries[i].charge * 100) /
	46	pmu_batteries[i].max_charge;
	47	charge += pmu_batteries[i].charge;
	48	amperage += pmu_batteries[i].amperage;
	49	if (btype == 0)
	50	btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK);
	51	real_count++;
	52	if ((pmu_batteries[i].flags & PMU_BATT_CHARGING))
	53	charging++;
	54	}
	55	}
b3028878 JB	56	if (batteries == 0)
	57	info->ac_line_status = APM_AC_ONLINE;
	58
1da177e4 LT	59	if (real_count) {
	60	if (amperage < 0) {
	61	if (btype == PMU_BATT_TYPE_SMART)
	62	time_units = (charge * 59) / (amperage * -1);
	63	else
	64	time_units = (charge * 16440) / (amperage * -60);
	65	}
	66	percentage /= real_count;
	67	if (charging > 0) {
b3028878 JB	68	info->battery_status = APM_BATTERY_STATUS_CHARGING;
b3028878 JB	69	info->battery_flag = APM_BATTERY_FLAG_CHARGING;
1da177e4	70	} else if (percentage <= APM_CRITICAL) {
b3028878 JB	71	info->battery_status = APM_BATTERY_STATUS_CRITICAL;
b3028878 JB	72	info->battery_flag = APM_BATTERY_FLAG_CRITICAL;
1da177e4	73	} else if (percentage <= APM_LOW) {
b3028878 JB	74	info->battery_status = APM_BATTERY_STATUS_LOW;
b3028878 JB	75	info->battery_flag = APM_BATTERY_FLAG_LOW;
1da177e4	76	} else {
b3028878 JB	77	info->battery_status = APM_BATTERY_STATUS_HIGH;
b3028878 JB	78	info->battery_flag = APM_BATTERY_FLAG_HIGH;
1da177e4 LT	79	}
1da177e4 LT	80	}
1da177e4	81
b3028878 JB	82	info->battery_life = percentage;
b3028878 JB	83	info->time = time_units;
1da177e4 LT	84	}
1da177e4 LT	85
1da177e4 LT	86	static int __init apm_emu_init(void)
1da177e4 LT	87	{
b3028878	88	apm_get_power_status = pmu_apm_get_power_status;
1da177e4	89
b3028878	90	printk(KERN_INFO "apm_emu: PMU APM Emulation initialized.\n");
1da177e4 LT	91
	92	return 0;
	93	}
	94
	95	static void __exit apm_emu_exit(void)
	96	{
b3028878 JB	97	if (apm_get_power_status == pmu_apm_get_power_status)
b3028878 JB	98	apm_get_power_status = NULL;
1da177e4	99
b3028878	100	printk(KERN_INFO "apm_emu: PMU APM Emulation removed.\n");
1da177e4 LT	101	}
	102
	103	module_init(apm_emu_init);
	104	module_exit(apm_emu_exit);
	105
	106	MODULE_AUTHOR("Benjamin Herrenschmidt");
b3028878	107	MODULE_DESCRIPTION("APM emulation for PowerMac");
1da177e4	108	MODULE_LICENSE("GPL");