path: root/drivers/acpi/sbs.c

/*
 *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
 *
 *  Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
 *  Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
 *  Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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 of the License, 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.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>

#ifdef CONFIG_ACPI_PROCFS_POWER
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#endif

#include <linux/acpi.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/delay.h>

#ifdef CONFIG_ACPI_SYSFS_POWER
#include <linux/power_supply.h>
#endif

#include "sbshc.h"

#define ACPI_SBS_CLASS			"sbs"
#define ACPI_AC_CLASS			"ac_adapter"
#define ACPI_BATTERY_CLASS		"battery"
#define ACPI_SBS_DEVICE_NAME		"Smart Battery System"
#define ACPI_SBS_FILE_INFO		"info"
#define ACPI_SBS_FILE_STATE		"state"
#define ACPI_SBS_FILE_ALARM		"alarm"
#define ACPI_BATTERY_DIR_NAME		"BAT%i"
#define ACPI_AC_DIR_NAME		"AC0"

#define ACPI_SBS_NOTIFY_STATUS		0x80
#define ACPI_SBS_NOTIFY_INFO		0x81

MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
MODULE_LICENSE("GPL");

static unsigned int cache_time = 1000;
module_param(cache_time, uint, 0644);
MODULE_PARM_DESC(cache_time, "cache time in milliseconds");

extern struct proc_dir_entry *acpi_lock_ac_dir(void);
extern struct proc_dir_entry *acpi_lock_battery_dir(void);
extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);

#define MAX_SBS_BAT			4
#define ACPI_SBS_BLOCK_MAX		32

static const struct acpi_device_id sbs_device_ids[] = {
	{"ACPI0002", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, sbs_device_ids);

struct acpi_battery {
#ifdef CONFIG_ACPI_SYSFS_POWER
	struct power_supply bat;
#endif
	struct acpi_sbs *sbs;
#ifdef CONFIG_ACPI_PROCFS_POWER
	struct proc_dir_entry *proc_entry;
#endif
	unsigned long update_time;
	char name[8];
	char manufacturer_name[ACPI_SBS_BLOCK_MAX];
	char device_name[ACPI_SBS_BLOCK_MAX];
	char device_chemistry[ACPI_SBS_BLOCK_MAX];
	u16 alarm_capacity;
	u16 full_charge_capacity;
	u16 design_capacity;
	u16 design_voltage;
	u16 serial_number;
	u16 cycle_count;
	u16 temp_now;
	u16 voltage_now;
	s16 current_now;
	s16 current_avg;
	u16 capacity_now;
	u16 state_of_charge;
	u16 state;
	u16 mode;
	u16 spec;
	u8 id;
	u8 present:1;
	u8 have_sysfs_alarm:1;
};

#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);

struct acpi_sbs {
#ifdef CONFIG_ACPI_SYSFS_POWER
	struct power_supply charger;
#endif
	struct acpi_device *device;
	struct acpi_smb_hc *hc;
	struct mutex lock;
#ifdef CONFIG_ACPI_PROCFS_POWER
	struct proc_dir_entry *charger_entry;
#endif
	struct acpi_battery battery[MAX_SBS_BAT];
	u8 batteries_supported:4;
	u8 manager_present:1;
	u8 charger_present:1;
};

#define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)

static inline int battery_scale(int log)
{
	int scale = 1;
	while (log--)
		scale *= 10;
	return scale;
}

static inline int acpi_battery_vscale(struct acpi_battery *battery)
{
	return battery_scale((battery->spec & 0x0f00) >> 8);
}

static inline int acpi_battery_ipscale(struct acpi_battery *battery)
{
	return battery_scale((battery->spec & 0xf000) >> 12);
}

static inline int acpi_battery_mode(struct acpi_battery *battery)
{
	return (battery->mode & 0x8000);
}

static inline int acpi_battery_scale(struct acpi_battery *battery)
{
	return (acpi_battery_mode(battery) ? 10 : 1) *
	    acpi_battery_ipscale(battery);
}

#ifdef CONFIG_ACPI_SYSFS_POWER
static int sbs_get_ac_property(struct power_supply *psy,
			       enum power_supply_property psp,
			       union power_supply_propval *val)
{
	struct acpi_sbs *sbs = to_acpi_sbs(psy);
	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE