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linux/drivers/acpi/battery.c
Alexey Dobriyan 99b7623380 proc 2/2: remove struct proc_dir_entry::owner 
Setting ->owner as done currently (pde->owner = THIS_MODULE) is racy
as correctly noted at bug #12454. Someone can lookup entry with NULL
->owner, thus not pinning enything, and release it later resulting
in module refcount underflow.

We can keep ->owner and supply it at registration time like ->proc_fops
and ->data.

But this leaves ->owner as easy-manipulative field (just one C assignment)
and somebody will forget to unpin previous/pin current module when
switching ->owner. ->proc_fops is declared as "const" which should give
some thoughts.

->read_proc/->write_proc were just fixed to not require ->owner for
protection.

rmmod'ed directories will be empty and return "." and ".." -- no harm.
And directories with tricky enough readdir and lookup shouldn't be modular.
We definitely don't want such modular code.

Removing ->owner will also make PDE smaller.

So, let's nuke it.

Kudos to Jeff Layton for reminding about this, let's say, oversight.

http://bugzilla.kernel.org/show_bug.cgi?id=12454

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
2009-03-31 01:14:44 +04:00

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/*
* battery.c - ACPI Battery Driver (Revision: 2.0)
*
* Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
* Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/jiffies.h>
#ifdef CONFIG_ACPI_PROCFS_POWER
#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>
#ifdef CONFIG_ACPI_SYSFS_POWER
#include <linux/power_supply.h>
#endif
#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
#define ACPI_BATTERY_CLASS "battery"
#define ACPI_BATTERY_DEVICE_NAME "Battery"
#define ACPI_BATTERY_NOTIFY_STATUS 0x80
#define ACPI_BATTERY_NOTIFY_INFO 0x81
#define _COMPONENT ACPI_BATTERY_COMPONENT
ACPI_MODULE_NAME("battery");
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
MODULE_DESCRIPTION("ACPI Battery 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");
#ifdef CONFIG_ACPI_PROCFS_POWER
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);
struct acpi_battery {
struct mutex lock;
#ifdef CONFIG_ACPI_SYSFS_POWER
struct power_supply bat;
#endif
struct acpi_device *device;
unsigned long update_time;
int current_now;
int capacity_now;
int voltage_now;
int design_capacity;
int full_charge_capacity;
int technology;
int design_voltage;
int design_capacity_warning;
int design_capacity_low;
int capacity_granularity_1;
int capacity_granularity_2;
int alarm;
char model_number[32];
char serial_number[32];
char type[32];
char oem_info[32];
int state;
int power_unit;
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;
}
#ifdef CONFIG_ACPI_SYSFS_POWER
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 (!strncasecmp("LI-ION", battery->type, 6))
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_state(struct acpi_battery *battery);
static int acpi_battery_is_charged(struct acpi_battery *battery)
{
/* either charging or discharging */
if (battery->state != 0)
return 0;
/* battery not reporting charge */
if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
battery->capacity_now == 0)
return 0;
/* good batteries update full_charge as the batteries degrade */
if (battery->full_charge_capacity == battery->capacity_now)
return 1;
/* fallback to using design values for broken batteries */
if (battery->design_capacity == battery->capacity_now)
return 1;
/* we don't do any sort of metric based on percentages */
return 0;
}
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)) {
/* run battery update only if it is present */
acpi_battery_get_state(battery);
} else if (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 (acpi_battery_is_charged(battery))
val->intval = POWER_SUPPLY_STATUS_FULL;
else
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
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;
case POWER_SUPPLY_PROP_SERIAL_NUMBER:
val->strval = battery->serial_number;
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,
POWER_SUPPLY_PROP_SERIAL_NUMBER,
};
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,
POWER_SUPPLY_PROP_SERIAL_NUMBER,
};
#endif
#ifdef CONFIG_ACPI_PROCFS_POWER
inline char *acpi_battery_units(struct acpi_battery *battery)
{
return (battery->power_unit)?"mA":"mW";
}
#endif
/* --------------------------------------------------------------------------
Battery Management
-------------------------------------------------------------------------- */
struct acpi_offsets {
size_t offset; /* offset inside struct acpi_sbs_battery */
u8 mode; /* int or string? */
};
static struct acpi_offsets state_offsets[] = {
{offsetof(struct acpi_battery, state), 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, 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},
{offsetof(struct acpi_battery, design_capacity_low), 0},
{offsetof(struct acpi_battery, capacity_granularity_1), 0},
{offsetof(struct acpi_battery, capacity_granularity_2), 0},
{offsetof(struct acpi_battery, model_number), 1},
{offsetof(struct acpi_battery, serial_number), 1},
{offsetof(struct acpi_battery, type), 1},
{offsetof(struct acpi_battery, oem_info), 1},
};
static int extract_package(struct acpi_battery *battery,
union acpi_object *package,
struct acpi_offsets *offsets, int num)
{
int i;
union acpi_object *element;
if (package->type != ACPI_TYPE_PACKAGE)
return -EFAULT;
for (i = 0; i < num; ++i) {
if (package->package.count <= i)
return -EFAULT;
element = &package->package.elements[i];
if (offsets[i].mode) {
u8 *ptr = (u8 *)battery + offsets[i].offset;
if (element->type == ACPI_TYPE_STRING ||
element->type == ACPI_TYPE_BUFFER)
strncpy(ptr, element->string.pointer, 32);
else if (element->type == ACPI_TYPE_INTEGER) {
strncpy(ptr, (u8 *)&element->integer.value,
sizeof(acpi_integer));
ptr[sizeof(acpi_integer)] = 0;
} else
*ptr = 0; /* don't have value */
} else {
int *x = (int *)((u8 *)battery + offsets[i].offset);
*x = (element->type == ACPI_TYPE_INTEGER) ?
element->integer.value : -1;
}
}
return 0;
}
static int acpi_battery_get_status(struct acpi_battery *battery)
{
if (acpi_bus_get_status(battery->device)) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
return -ENODEV;
}
return 0;
}
static int acpi_battery_get_info(struct acpi_battery *battery)
{
int result = -EFAULT;
acpi_status status = 0;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
if (!acpi_battery_present(battery))
return 0;
mutex_lock(&battery->lock);
status = acpi_evaluate_object(battery->device->handle, "_BIF",
NULL, &buffer);
mutex_unlock(&battery->lock);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
return -ENODEV;
}
result = extract_package(battery, buffer.pointer,
info_offsets, ARRAY_SIZE(info_offsets));
kfree(buffer.pointer);
return result;
}
static int acpi_battery_get_state(struct acpi_battery *battery)
{
int result = 0;
acpi_status status = 0;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
if (!acpi_battery_present(battery))
return 0;
if (battery->update_time &&
time_before(jiffies, battery->update_time +
msecs_to_jiffies(cache_time)))
return 0;
mutex_lock(&battery->lock);
status = acpi_evaluate_object(battery->device->handle, "_BST",
NULL, &buffer);
mutex_unlock(&battery->lock);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
return -ENODEV;
}
result = extract_package(battery, buffer.pointer,
state_offsets, ARRAY_SIZE(state_offsets));
battery->update_time = jiffies;
kfree(buffer.pointer);
return result;
}
static int acpi_battery_set_alarm(struct acpi_battery *battery)
{
acpi_status status = 0;
union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
struct acpi_object_list arg_list = { 1, &arg0 };
if (!acpi_battery_present(battery)|| !battery->alarm_present)
return -ENODEV;
arg0.integer.value = battery->alarm;
mutex_lock(&battery->lock);
status = acpi_evaluate_object(battery->device->handle, "_BTP",
&arg_list, NULL);
mutex_unlock(&battery->lock);
if (ACPI_FAILURE(status))
return -ENODEV;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
return 0;
}
static int acpi_battery_init_alarm(struct acpi_battery *battery)
{
acpi_status status = AE_OK;
acpi_handle handle = NULL;
/* See if alarms are supported, and if so, set default */
status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
if (ACPI_FAILURE(status)) {
battery->alarm_present = 0;
return 0;
}
battery->alarm_present = 1;
if (!battery->alarm)
battery->alarm = battery->design_capacity_warning;
return acpi_battery_set_alarm(battery);
}
#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));
return sprintf(buf, "%d\n", battery->alarm * 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 = x/1000;
if (acpi_battery_present(battery))
acpi_battery_set_alarm(battery);
return count;
}
static struct device_attribute alarm_attr = {
.attr = {.name = "alarm", .mode = 0644},
.show = acpi_battery_alarm_show,
.store = acpi_battery_alarm_store,
};
static int sysfs_add_battery(struct acpi_battery *battery)
{
int 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);
}
battery->bat.name = acpi_device_bid(battery->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);
if (result)
return result;
return device_create_file(battery->bat.dev, &alarm_attr);
}
static void sysfs_remove_battery(struct acpi_battery *battery)
{
if (!battery->bat.dev)
return;
device_remove_file(battery->bat.dev, &alarm_attr);
power_supply_unregister(&battery->bat);
battery->bat.dev = NULL;
}
#endif
static int acpi_battery_update(struct acpi_battery *battery)
{
int result, old_present = acpi_battery_present(battery);
result = acpi_battery_get_status(battery);
if (result)
return result;
#ifdef CONFIG_ACPI_SYSFS_POWER
if (!acpi_battery_present(battery)) {
sysfs_remove_battery(battery);
battery->update_time = 0;
return 0;
}
#endif
if (!battery->update_time ||
old_present != acpi_battery_present(battery)) {
result = acpi_battery_get_info(battery);
if (result)
return result;
acpi_battery_init_alarm(battery);
}
#ifdef CONFIG_ACPI_SYSFS_POWER
if (!battery->bat.dev)
sysfs_add_battery(battery);
#endif
return acpi_battery_get_state(battery);
}
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
#ifdef CONFIG_ACPI_PROCFS_POWER
static struct proc_dir_entry *acpi_battery_dir;
static int acpi_battery_print_info(struct seq_file *seq, int result)
{
struct acpi_battery *battery = seq->private;
if (result)
goto end;
seq_printf(seq, "present: %s\n",
acpi_battery_present(battery)?"yes":"no");
if (!acpi_battery_present(battery))
goto end;
if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "design capacity: unknown\n");
else
seq_printf(seq, "design capacity: %d %sh\n",
battery->design_capacity,
acpi_battery_units(battery));
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->full_charge_capacity,
acpi_battery_units(battery));
seq_printf(seq, "battery technology: %srechargeable\n",
(!battery->technology)?"non-":"");
if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "design voltage: unknown\n");
else
seq_printf(seq, "design voltage: %d mV\n",
battery->design_voltage);
seq_printf(seq, "design capacity warning: %d %sh\n",
battery->design_capacity_warning,
acpi_battery_units(battery));
seq_printf(seq, "design capacity low: %d %sh\n",
battery->design_capacity_low,
acpi_battery_units(battery));
seq_printf(seq, "capacity granularity 1: %d %sh\n",
battery->capacity_granularity_1,
acpi_battery_units(battery));
seq_printf(seq, "capacity granularity 2: %d %sh\n",
battery->capacity_granularity_2,
acpi_battery_units(battery));
seq_printf(seq, "model number: %s\n", battery->model_number);
seq_printf(seq, "serial number: %s\n", battery->serial_number);
seq_printf(seq, "battery type: %s\n", battery->type);
seq_printf(seq, "OEM info: %s\n", battery->oem_info);
end:
if (result)
seq_printf(seq, "ERROR: Unable to read battery info\n");
return result;
}
static int acpi_battery_print_state(struct seq_file *seq, int result)
{
struct acpi_battery *battery = seq->private;
if (result)
goto end;
seq_printf(seq, "present: %s\n",
acpi_battery_present(battery)?"yes":"no");
if (!acpi_battery_present(battery))
goto end;
seq_printf(seq, "capacity state: %s\n",
(battery->state & 0x04)?"critical":"ok");
if ((battery->state & 0x01) && (battery->state & 0x02))
seq_printf(seq,
"charging state: charging/discharging\n");
else if (battery->state & 0x01)
seq_printf(seq, "charging state: discharging\n");
else if (battery->state & 0x02)
seq_printf(seq, "charging state: charging\n");
else
seq_printf(seq, "charging state: charged\n");
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->current_now, acpi_battery_units(battery));
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->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->voltage_now);
end:
if (result)
seq_printf(seq, "ERROR: Unable to read battery state\n");
return result;
}
static int acpi_battery_print_alarm(struct seq_file *seq, int result)
{
struct acpi_battery *battery = seq->private;
if (result)
goto end;
if (!acpi_battery_present(battery)) {
seq_printf(seq, "present: no\n");
goto end;
}
seq_printf(seq, "alarm: ");
if (!battery->alarm)
seq_printf(seq, "unsupported\n");
else
seq_printf(seq, "%u %sh\n", battery->alarm,
acpi_battery_units(battery));
end:
if (result)
seq_printf(seq, "ERROR: Unable to read battery alarm\n");
return result;
}
static ssize_t acpi_battery_write_alarm(struct file *file,
const char __user * buffer,
size_t count, loff_t * ppos)
{
int result = 0;
char alarm_string[12] = { '\0' };
struct seq_file *m = file->private_data;
struct acpi_battery *battery = m->private;
if (!battery || (count > sizeof(alarm_string) - 1))
return -EINVAL;
if (!acpi_battery_present(battery)) {
result = -ENODEV;
goto end;
}
if (copy_from_user(alarm_string, buffer, count)) {
result = -EFAULT;
goto end;
}
alarm_string[count] = '\0';
battery->alarm = simple_strtol(alarm_string, NULL, 0);
result = acpi_battery_set_alarm(battery);
end:
if (!result)
return count;
return result;
}
typedef int(*print_func)(struct seq_file *seq, int result);
static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
acpi_battery_print_info,
acpi_battery_print_state,
acpi_battery_print_alarm,
};
static int acpi_battery_read(int fid, struct seq_file *seq)
{
struct acpi_battery *battery = seq->private;
int result = acpi_battery_update(battery);
return acpi_print_funcs[fid](seq, result);
}
#define DECLARE_FILE_FUNCTIONS(_name) \
static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
{ \
return acpi_battery_read(_name##_tag, seq); \
} \
static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
{ \
return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
}
DECLARE_FILE_FUNCTIONS(info);
DECLARE_FILE_FUNCTIONS(state);
DECLARE_FILE_FUNCTIONS(alarm);
#undef DECLARE_FILE_FUNCTIONS
#define FILE_DESCRIPTION_RO(_name) \
{ \
.name = __stringify(_name), \
.mode = S_IRUGO, \
.ops = { \
.open = acpi_battery_##_name##_open_fs, \
.read = seq_read, \
.llseek = seq_lseek, \
.release = single_release, \
.owner = THIS_MODULE, \
}, \
}
#define FILE_DESCRIPTION_RW(_name) \
{ \
.name = __stringify(_name), \
.mode = S_IFREG | S_IRUGO | S_IWUSR, \
.ops = { \
.open = acpi_battery_##_name##_open_fs, \
.read = seq_read, \
.llseek = seq_lseek, \
.write = acpi_battery_write_##_name, \
.release = single_release, \
.owner = THIS_MODULE, \
}, \
}
static struct battery_file {
struct file_operations ops;
mode_t mode;
char *name;
} acpi_battery_file[] = {
FILE_DESCRIPTION_RO(info),
FILE_DESCRIPTION_RO(state),
FILE_DESCRIPTION_RW(alarm),
};
#undef FILE_DESCRIPTION_RO
#undef FILE_DESCRIPTION_RW
static int acpi_battery_add_fs(struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
int i;
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
acpi_battery_dir);
if (!acpi_device_dir(device))
return -ENODEV;
}
for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
entry = proc_create_data(acpi_battery_file[i].name,
acpi_battery_file[i].mode,
acpi_device_dir(device),
&acpi_battery_file[i].ops,
acpi_driver_data(device));
if (!entry)
return -ENODEV;
}
return 0;
}
static void acpi_battery_remove_fs(struct acpi_device *device)
{
int i;
if (!acpi_device_dir(device))
return;
for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
remove_proc_entry(acpi_battery_file[i].name,
acpi_device_dir(device));
remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
acpi_device_dir(device) = NULL;
}
#endif
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_battery *battery = data;
struct acpi_device *device;
if (!battery)
return;
device = battery->device;
acpi_battery_update(battery);
acpi_bus_generate_proc_event(device, event,
acpi_battery_present(battery));
acpi_bus_generate_netlink_event(device->pnp.device_class,
dev_name(&device->dev), event,
acpi_battery_present(battery));
#ifdef CONFIG_ACPI_SYSFS_POWER
/* acpi_batter_update could remove power_supply object */
if (battery->bat.dev)
kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
#endif
}
static int acpi_battery_add(struct acpi_device *device)
{
int result = 0;
acpi_status status = 0;
struct acpi_battery *battery = NULL;
if (!device)
return -EINVAL;
battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
if (!battery)
return -ENOMEM;
battery->device = device;
strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
device->driver_data = battery;
mutex_init(&battery->lock);
acpi_battery_update(battery);
#ifdef CONFIG_ACPI_PROCFS_POWER
result = acpi_battery_add_fs(device);
if (result)
goto end;
#endif
status = acpi_install_notify_handler(device->handle,
ACPI_ALL_NOTIFY,
acpi_battery_notify, battery);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
result = -ENODEV;
goto end;
}
printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
device->status.battery_present ? "present" : "absent");
end:
if (result) {
#ifdef CONFIG_ACPI_PROCFS_POWER
acpi_battery_remove_fs(device);
#endif
kfree(battery);
}
return result;
}
static int acpi_battery_remove(struct acpi_device *device, int type)
{
acpi_status status = 0;
struct acpi_battery *battery = NULL;
if (!device || !acpi_driver_data(device))
return -EINVAL;
battery = acpi_driver_data(device);
status = acpi_remove_notify_handler(device->handle,
ACPI_ALL_NOTIFY,
acpi_battery_notify);
#ifdef CONFIG_ACPI_PROCFS_POWER
acpi_battery_remove_fs(device);
#endif
#ifdef CONFIG_ACPI_SYSFS_POWER
sysfs_remove_battery(battery);
#endif
mutex_destroy(&battery->lock);
kfree(battery);
return 0;
}
/* this is needed to learn about changes made in suspended state */
static int acpi_battery_resume(struct acpi_device *device)
{
struct acpi_battery *battery;
if (!device)
return -EINVAL;
battery = acpi_driver_data(device);
battery->update_time = 0;
acpi_battery_update(battery);
return 0;
}
static struct acpi_driver acpi_battery_driver = {
.name = "battery",
.class = ACPI_BATTERY_CLASS,
.ids = battery_device_ids,
.ops = {
.add = acpi_battery_add,
.resume = acpi_battery_resume,
.remove = acpi_battery_remove,
},
};
static int __init acpi_battery_init(void)
{
if (acpi_disabled)
return -ENODEV;
#ifdef CONFIG_ACPI_PROCFS_POWER
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_POWER
acpi_unlock_battery_dir(acpi_battery_dir);
#endif
return -ENODEV;
}
return 0;
}
static void __exit acpi_battery_exit(void)
{
acpi_bus_unregister_driver(&acpi_battery_driver);
#ifdef CONFIG_ACPI_PROCFS_POWER
acpi_unlock_battery_dir(acpi_battery_dir);
#endif
}
module_init(acpi_battery_init);
module_exit(acpi_battery_exit);
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