sbs.c

linux 内核源代码

/*
 *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
 *
 *  Copyright (c) 2007 Alexey Starikovskiy <[e-mail]>
 *  Copyright (c) 2005-2007 Vladimir Lebedev <[e-mail]>
 *  Copyright (c) 2005 Rich Townsend <[e-mail]>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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 <[e-mail]>");
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:
		val->intval = sbs->charger_present;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int acpi_battery_technology(struct acpi_battery *battery)
{
	if (!strcasecmp("NiCd", battery->device_chemistry))
		return POWER_SUPPLY_TECHNOLOGY_NiCd;
	if (!strcasecmp("NiMH", battery->device_chemistry))
		return POWER_SUPPLY_TECHNOLOGY_NiMH;
	if (!strcasecmp("LION", battery->device_chemistry))
		return POWER_SUPPLY_TECHNOLOGY_LION;
	if (!strcasecmp("LiP", battery->device_chemistry))
		return POWER_SUPPLY_TECHNOLOGY_LIPO;
	return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
}

static int acpi_sbs_battery_get_property(struct power_supply *psy,
					 enum power_supply_property psp,
					 union power_supply_propval *val)
{
	struct acpi_battery *battery = to_acpi_battery(psy);

	if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
		return -ENODEV;
	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (battery->current_now < 0)
			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		else if (battery->current_now > 0)
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else
			val->intval = POWER_SUPPLY_STATUS_FULL;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = battery->present;
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = acpi_battery_technology(battery);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		val->intval = battery->design_voltage *
			acpi_battery_vscale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = battery->voltage_now *
				acpi_battery_vscale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		val->intval = abs(battery->current_now) *
				acpi_battery_ipscale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
		val->intval = abs(battery->current_avg) *
				acpi_battery_ipscale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		val->intval = battery->state_of_charge;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
		val->intval = battery->design_capacity *
			acpi_battery_scale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL:
	case POWER_SUPPLY_PROP_ENERGY_FULL:
		val->intval = battery->full_charge_capacity *
			acpi_battery_scale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
	case POWER_SUPPLY_PROP_ENERGY_NOW:
		val->intval = battery->capacity_now *
				acpi_battery_scale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_TEMP:
		val->intval = battery->temp_now - 2730;	// dK -> dC
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = battery->device_name;
		break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = battery->manufacturer_name;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static enum power_supply_property sbs_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
};

static enum power_supply_property sbs_charge_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property sbs_energy_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
	POWER_SUPPLY_PROP_ENERGY_FULL,
	POWER_SUPPLY_PROP_ENERGY_NOW,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
};
#endif

/* --------------------------------------------------------------------------
                            Smart Battery System Management
   -------------------------------------------------------------------------- */

struct acpi_battery_reader {
	u8 command;		/* command for battery */
	u8 mode;		/* word or block? */
	size_t offset;		/* offset inside struct acpi_sbs_battery */
};

static struct acpi_battery_reader info_readers[] = {
	{0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
	{0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
	{0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
	{0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
	{0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
	{0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
	{0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
	{0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
	{0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
	{0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
	{0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
};

static struct acpi_battery_reader state_readers[] = {
	{0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
	{0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
	{0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_now)},
	{0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_avg)},
	{0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
	{0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
	{0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
};

static int acpi_manager_get_info(struct acpi_sbs *sbs)
{
	int result = 0;
	u16 battery_system_info;

	result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
				 0x04, (u8 *)&battery_system_info);
	if (!result)
		sbs->batteries_supported = battery_system_info & 0x000f;
	return result;
}

static int acpi_battery_get_info(struct acpi_battery *battery)
{
	int i, result = 0;

	for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
		result = acpi_smbus_read(battery->sbs->hc,
					 info_readers[i].mode,
					 ACPI_SBS_BATTERY,
					 info_readers[i].command,
					 (u8 *) battery +
						info_readers[i].offset);
		if (result)
			break;
	}
	return result;
}

static int acpi_battery_get_state(struct acpi_battery *battery)
{
	int i, result = 0;

	if (battery->update_time &&
	    time_before(jiffies, battery->update_time +
				msecs_to_jiffies(cache_time)))
		return 0;
	for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
		result = acpi_smbus_read(battery->sbs->hc,
					 state_readers[i].mode,
					 ACPI_SBS_BATTERY,
					 state_readers[i].command,
				         (u8 *)battery +
						state_readers[i].offset);
		if (result)
			goto end;
	}
      end:
	battery->update_time = jiffies;
	return result;
}

static int acpi_battery_get_alarm(struct acpi_battery *battery)
{
	return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
				 ACPI_SBS_BATTERY, 0x01,
				 (u8 *)&battery->alarm_capacity);
}

static int acpi_battery_set_alarm(struct acpi_battery *battery)
{
	struct acpi_sbs *sbs = battery->sbs;
	u16 value, sel = 1 << (battery->id + 12);

	int ret;


	if (sbs->manager_present) {
		ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
				0x01, (u8 *)&value);
		if (ret)
			goto end;
		if ((value & 0xf000) != sel) {
			value &= 0x0fff;
			value |= sel;
		ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
					 ACPI_SBS_MANAGER,
					 0x01, (u8 *)&value, 2);
		if (ret)
			goto end;
		}
	}
	ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
				0x01, (u8 *)&battery->alarm_capacity, 2);
      end:
	return ret;
}

static int acpi_ac_get_present(struct acpi_sbs *sbs)
{
	int result;
	u16 status;

	result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
				 0x13, (u8 *) & status);
	if (!result)
		sbs->charger_present = (status >> 15) & 0x1;
	return result;
}

#ifdef CONFIG_ACPI_SYSFS_POWER
static ssize_t acpi_battery_alarm_show(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
	acpi_battery_get_alarm(battery);
	return sprintf(buf, "%d\n", battery->alarm_capacity *
				acpi_battery_scale(battery) * 1000);
}

static ssize_t acpi_battery_alarm_store(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t count)
{
	unsigned long x;
	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
	if (sscanf(buf, "%ld\n", &x) == 1)
		battery->alarm_capacity = x /
			(1000 * acpi_battery_scale(battery));
	if (battery->present)
		acpi_battery_set_alarm(battery);
	return count;
}

static struct device_attribute alarm_attr = {
	.attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
	.show = acpi_battery_alarm_show,
	.store = acpi_battery_alarm_store,
};
#endif

/* --------------------------------------------------------------------------
                              FS Interface (/proc/acpi)
   -------------------------------------------------------------------------- */

#ifdef CONFIG_ACPI_PROCFS_POWER
/* Generic Routines */
static int
acpi_sbs_add_fs(struct proc_dir_entry **dir,
		struct proc_dir_entry *parent_dir,
		char *dir_name,
		struct file_operations *info_fops,
		struct file_operations *state_fops,
		struct file_operations *alarm_fops, void *data)
{
	struct proc_dir_entry *entry = NULL;

	if (!*dir) {
		*dir = proc_mkdir(dir_name, parent_dir);
		if (!*dir) {
			return -ENODEV;
		}
		(*dir)->owner = THIS_MODULE;
	}

	/* 'info' [R] */
	if (info_fops) {
		entry = create_proc_entry(ACPI_SBS_FILE_INFO, S_IRUGO, *dir);
		if (entry) {
			entry->proc_fops = info_fops;
			entry->data = data;
			entry->owner = THIS_MODULE;
		}
	}

	/* 'state' [R] */
	if (state_fops) {
		entry = create_proc_entry(ACPI_SBS_FILE_STATE, S_IRUGO, *dir);
		if (entry) {
			entry->proc_fops = state_fops;
			entry->data = data;
			entry->owner = THIS_MODULE;
		}
	}

	/* 'alarm' [R/W] */
	if (alarm_fops) {
		entry = create_proc_entry(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir);
		if (entry) {
			entry->proc_fops = alarm_fops;
			entry->data = data;
			entry->owner = THIS_MODULE;
		}
	}
	return 0;
}

static void
acpi_sbs_remove_fs(struct proc_dir_entry **dir,
			   struct proc_dir_entry *parent_dir)
{