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ACPI: Battery: Add sysfs support
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Refer to Documentation/power_supply_class.txt for interface description.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
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Alexey Starikovskiy authored and Len Brown committed Sep 27, 2007
1 parent aa650bb commit d738096
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Showing 2 changed files with 165 additions and 23 deletions.
2 changes: 1 addition & 1 deletion drivers/acpi/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,7 @@ config ACPI_AC

config ACPI_BATTERY
tristate "Battery"
depends on X86
depends on X86 && POWER_SUPPLY
default y
help
This driver adds support for battery information through
Expand Down
186 changes: 164 additions & 22 deletions drivers/acpi/battery.c
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Original file line number Diff line number Diff line change
Expand Up @@ -30,13 +30,18 @@
#include <linux/init.h>
#include <linux/types.h>
#include <linux/jiffies.h>

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

#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#include <linux/power_supply.h>

#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF

#define ACPI_BATTERY_COMPONENT 0x00040000
Expand All @@ -58,32 +63,37 @@ static unsigned int cache_time = 1000;
module_param(cache_time, uint, 0644);
MODULE_PARM_DESC(cache_time, "cache time in milliseconds");

#ifdef CONFIG_ACPI_PROCFS
extern struct proc_dir_entry *acpi_lock_battery_dir(void);
extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);

enum acpi_battery_files {
info_tag = 0,
state_tag,
alarm_tag,
ACPI_BATTERY_NUMFILES,
};

#endif

static const struct acpi_device_id battery_device_ids[] = {
{"PNP0C0A", 0},
{"", 0},
};

MODULE_DEVICE_TABLE(acpi, battery_device_ids);

enum acpi_battery_files {
info_tag = 0,
state_tag,
alarm_tag,
ACPI_BATTERY_NUMFILES,
};

struct acpi_battery {
struct mutex lock;
struct power_supply bat;
struct acpi_device *device;
unsigned long update_time;
int present_rate;
int remaining_capacity;
int present_voltage;
int current_now;
int capacity_now;
int voltage_now;
int design_capacity;
int last_full_capacity;
int full_charge_capacity;
int technology;
int design_voltage;
int design_capacity_warning;
Expand All @@ -100,15 +110,117 @@ struct acpi_battery {
u8 alarm_present;
};

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

inline int acpi_battery_present(struct acpi_battery *battery)
{
return battery->device->status.battery_present;
}

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

static int acpi_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 ((!acpi_battery_present(battery)) &&
psp != POWER_SUPPLY_PROP_PRESENT)
return -ENODEV;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
if (battery->state & 0x01)
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
else if (battery->state & 0x02)
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else if (battery->state == 0)
val->intval = POWER_SUPPLY_STATUS_FULL;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = acpi_battery_present(battery);
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 * 1000;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = battery->voltage_now * 1000;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
val->intval = battery->current_now * 1000;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
val->intval = battery->design_capacity * 1000;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
case POWER_SUPPLY_PROP_ENERGY_FULL:
val->intval = battery->full_charge_capacity * 1000;
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
case POWER_SUPPLY_PROP_ENERGY_NOW:
val->intval = battery->capacity_now * 1000;
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = battery->model_number;
break;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = battery->oem_info;
break;
default:
return -EINVAL;
}
return 0;
}

static enum power_supply_property 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_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property 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_ENERGY_FULL_DESIGN,
POWER_SUPPLY_PROP_ENERGY_FULL,
POWER_SUPPLY_PROP_ENERGY_NOW,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
};

#ifdef CONFIG_ACPI_PROCFS
inline char *acpi_battery_units(struct acpi_battery *battery)
{
return (battery->power_unit)?"mA":"mW";
}
#endif

/* --------------------------------------------------------------------------
Battery Management
Expand All @@ -120,15 +232,15 @@ struct acpi_offsets {

static struct acpi_offsets state_offsets[] = {
{offsetof(struct acpi_battery, state), 0},
{offsetof(struct acpi_battery, present_rate), 0},
{offsetof(struct acpi_battery, remaining_capacity), 0},
{offsetof(struct acpi_battery, present_voltage), 0},
{offsetof(struct acpi_battery, current_now), 0},
{offsetof(struct acpi_battery, capacity_now), 0},
{offsetof(struct acpi_battery, voltage_now), 0},
};

static struct acpi_offsets info_offsets[] = {
{offsetof(struct acpi_battery, power_unit), 0},
{offsetof(struct acpi_battery, design_capacity), 0},
{offsetof(struct acpi_battery, last_full_capacity), 0},
{offsetof(struct acpi_battery, full_charge_capacity), 0},
{offsetof(struct acpi_battery, technology), 0},
{offsetof(struct acpi_battery, design_voltage), 0},
{offsetof(struct acpi_battery, design_capacity_warning), 0},
Expand Down Expand Up @@ -285,6 +397,15 @@ static int acpi_battery_update(struct acpi_battery *battery)
result = acpi_battery_get_info(battery);
if (result)
return result;
if (battery->power_unit) {
battery->bat.properties = charge_battery_props;
battery->bat.num_properties =
ARRAY_SIZE(charge_battery_props);
} else {
battery->bat.properties = energy_battery_props;
battery->bat.num_properties =
ARRAY_SIZE(energy_battery_props);
}
acpi_battery_init_alarm(battery);
}
return acpi_battery_get_state(battery);
Expand All @@ -294,6 +415,7 @@ static int acpi_battery_update(struct acpi_battery *battery)
FS Interface (/proc)
-------------------------------------------------------------------------- */

#ifdef CONFIG_ACPI_PROCFS
static struct proc_dir_entry *acpi_battery_dir;

static int acpi_battery_print_info(struct seq_file *seq, int result)
Expand All @@ -314,11 +436,11 @@ static int acpi_battery_print_info(struct seq_file *seq, int result)
battery->design_capacity,
acpi_battery_units(battery));

if (battery->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "last full capacity: unknown\n");
else
seq_printf(seq, "last full capacity: %d %sh\n",
battery->last_full_capacity,
battery->full_charge_capacity,
acpi_battery_units(battery));

seq_printf(seq, "battery technology: %srechargeable\n",
Expand Down Expand Up @@ -375,22 +497,22 @@ static int acpi_battery_print_state(struct seq_file *seq, int result)
else
seq_printf(seq, "charging state: charged\n");

if (battery->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)
if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "present rate: unknown\n");
else
seq_printf(seq, "present rate: %d %s\n",
battery->present_rate, acpi_battery_units(battery));
battery->current_now, acpi_battery_units(battery));

if (battery->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "remaining capacity: unknown\n");
else
seq_printf(seq, "remaining capacity: %d %sh\n",
battery->remaining_capacity, acpi_battery_units(battery));
if (battery->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
battery->capacity_now, acpi_battery_units(battery));
if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "present voltage: unknown\n");
else
seq_printf(seq, "present voltage: %d mV\n",
battery->present_voltage);
battery->voltage_now);
end:
if (result)
seq_printf(seq, "ERROR: Unable to read battery state\n");
Expand Down Expand Up @@ -564,6 +686,7 @@ static void acpi_battery_remove_fs(struct acpi_device *device)
acpi_device_dir(device) = NULL;
}

#endif
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
Expand All @@ -581,6 +704,7 @@ static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
acpi_bus_generate_netlink_event(device->pnp.device_class,
device->dev.bus_id, event,
acpi_battery_present(battery));
kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
}

static int acpi_battery_add(struct acpi_device *device)
Expand All @@ -599,9 +723,15 @@ static int acpi_battery_add(struct acpi_device *device)
acpi_driver_data(device) = battery;
mutex_init(&battery->lock);
acpi_battery_update(battery);
#ifdef CONFIG_ACPI_PROCFS
result = acpi_battery_add_fs(device);
if (result)
goto end;
#endif
battery->bat.name = acpi_device_bid(device);
battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
battery->bat.get_property = acpi_battery_get_property;
result = power_supply_register(&battery->device->dev, &battery->bat);
status = acpi_install_notify_handler(device->handle,
ACPI_ALL_NOTIFY,
acpi_battery_notify, battery);
Expand All @@ -615,7 +745,9 @@ static int acpi_battery_add(struct acpi_device *device)
device->status.battery_present ? "present" : "absent");
end:
if (result) {
#ifdef CONFIG_ACPI_PROCFS
acpi_battery_remove_fs(device);
#endif
kfree(battery);
}
return result;
Expand All @@ -632,7 +764,11 @@ static int acpi_battery_remove(struct acpi_device *device, int type)
status = acpi_remove_notify_handler(device->handle,
ACPI_ALL_NOTIFY,
acpi_battery_notify);
#ifdef CONFIG_ACPI_PROCFS
acpi_battery_remove_fs(device);
#endif
if (battery->bat.dev)
power_supply_unregister(&battery->bat);
mutex_destroy(&battery->lock);
kfree(battery);
return 0;
Expand Down Expand Up @@ -664,11 +800,15 @@ static int __init acpi_battery_init(void)
{
if (acpi_disabled)
return -ENODEV;
#ifdef CONFIG_ACPI_PROCFS
acpi_battery_dir = acpi_lock_battery_dir();
if (!acpi_battery_dir)
return -ENODEV;
#endif
if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
#ifdef CONFIG_ACPI_PROCFS
acpi_unlock_battery_dir(acpi_battery_dir);
#endif
return -ENODEV;
}
return 0;
Expand All @@ -677,7 +817,9 @@ static int __init acpi_battery_init(void)
static void __exit acpi_battery_exit(void)
{
acpi_bus_unregister_driver(&acpi_battery_driver);
#ifdef CONFIG_ACPI_PROCFS
acpi_unlock_battery_dir(acpi_battery_dir);
#endif
}

module_init(acpi_battery_init);
Expand Down

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