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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/acpi/battery.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/acpi/battery.c')
-rw-r--r--drivers/acpi/battery.c846
1 files changed, 846 insertions, 0 deletions
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
new file mode 100644
index 000000000000..c55feca9b7d5
--- /dev/null
+++ b/drivers/acpi/battery.c
@@ -0,0 +1,846 @@
+/*
+ * acpi_battery.c - ACPI Battery Driver ($Revision: 37 $)
+ *
+ * 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/proc_fs.h>
+#include <linux/seq_file.h>
+#include <asm/uaccess.h>
+
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+
+#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
+
+#define ACPI_BATTERY_FORMAT_BIF "NNNNNNNNNSSSS"
+#define ACPI_BATTERY_FORMAT_BST "NNNN"
+
+#define ACPI_BATTERY_COMPONENT 0x00040000
+#define ACPI_BATTERY_CLASS "battery"
+#define ACPI_BATTERY_HID "PNP0C0A"
+#define ACPI_BATTERY_DRIVER_NAME "ACPI Battery Driver"
+#define ACPI_BATTERY_DEVICE_NAME "Battery"
+#define ACPI_BATTERY_FILE_INFO "info"
+#define ACPI_BATTERY_FILE_STATUS "state"
+#define ACPI_BATTERY_FILE_ALARM "alarm"
+#define ACPI_BATTERY_NOTIFY_STATUS 0x80
+#define ACPI_BATTERY_NOTIFY_INFO 0x81
+#define ACPI_BATTERY_UNITS_WATTS "mW"
+#define ACPI_BATTERY_UNITS_AMPS "mA"
+
+
+#define _COMPONENT ACPI_BATTERY_COMPONENT
+ACPI_MODULE_NAME ("acpi_battery")
+
+MODULE_AUTHOR("Paul Diefenbaugh");
+MODULE_DESCRIPTION(ACPI_BATTERY_DRIVER_NAME);
+MODULE_LICENSE("GPL");
+
+static int acpi_battery_add (struct acpi_device *device);
+static int acpi_battery_remove (struct acpi_device *device, int type);
+
+static struct acpi_driver acpi_battery_driver = {
+ .name = ACPI_BATTERY_DRIVER_NAME,
+ .class = ACPI_BATTERY_CLASS,
+ .ids = ACPI_BATTERY_HID,
+ .ops = {
+ .add = acpi_battery_add,
+ .remove = acpi_battery_remove,
+ },
+};
+
+struct acpi_battery_status {
+ acpi_integer state;
+ acpi_integer present_rate;
+ acpi_integer remaining_capacity;
+ acpi_integer present_voltage;
+};
+
+struct acpi_battery_info {
+ acpi_integer power_unit;
+ acpi_integer design_capacity;
+ acpi_integer last_full_capacity;
+ acpi_integer battery_technology;
+ acpi_integer design_voltage;
+ acpi_integer design_capacity_warning;
+ acpi_integer design_capacity_low;
+ acpi_integer battery_capacity_granularity_1;
+ acpi_integer battery_capacity_granularity_2;
+ acpi_string model_number;
+ acpi_string serial_number;
+ acpi_string battery_type;
+ acpi_string oem_info;
+};
+
+struct acpi_battery_flags {
+ u8 present:1; /* Bay occupied? */
+ u8 power_unit:1; /* 0=watts, 1=apms */
+ u8 alarm:1; /* _BTP present? */
+ u8 reserved:5;
+};
+
+struct acpi_battery_trips {
+ unsigned long warning;
+ unsigned long low;
+};
+
+struct acpi_battery {
+ acpi_handle handle;
+ struct acpi_battery_flags flags;
+ struct acpi_battery_trips trips;
+ unsigned long alarm;
+ struct acpi_battery_info *info;
+};
+
+
+/* --------------------------------------------------------------------------
+ Battery Management
+ -------------------------------------------------------------------------- */
+
+static int
+acpi_battery_get_info (
+ struct acpi_battery *battery,
+ struct acpi_battery_info **bif)
+{
+ int result = 0;
+ acpi_status status = 0;
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+ struct acpi_buffer format = {sizeof(ACPI_BATTERY_FORMAT_BIF),
+ ACPI_BATTERY_FORMAT_BIF};
+ struct acpi_buffer data = {0, NULL};
+ union acpi_object *package = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_battery_get_info");
+
+ if (!battery || !bif)
+ return_VALUE(-EINVAL);
+
+ /* Evalute _BIF */
+
+ status = acpi_evaluate_object(battery->handle, "_BIF", NULL, &buffer);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BIF\n"));
+ return_VALUE(-ENODEV);
+ }
+
+ package = (union acpi_object *) buffer.pointer;
+
+ /* Extract Package Data */
+
+ status = acpi_extract_package(package, &format, &data);
+ if (status != AE_BUFFER_OVERFLOW) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BIF\n"));
+ result = -ENODEV;
+ goto end;
+ }
+
+ data.pointer = kmalloc(data.length, GFP_KERNEL);
+ if (!data.pointer) {
+ result = -ENOMEM;
+ goto end;
+ }
+ memset(data.pointer, 0, data.length);
+
+ status = acpi_extract_package(package, &format, &data);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BIF\n"));
+ kfree(data.pointer);
+ result = -ENODEV;
+ goto end;
+ }
+
+end:
+ acpi_os_free(buffer.pointer);
+
+ if (!result)
+ (*bif) = (struct acpi_battery_info *) data.pointer;
+
+ return_VALUE(result);
+}
+
+static int
+acpi_battery_get_status (
+ struct acpi_battery *battery,
+ struct acpi_battery_status **bst)
+{
+ int result = 0;
+ acpi_status status = 0;
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+ struct acpi_buffer format = {sizeof(ACPI_BATTERY_FORMAT_BST),
+ ACPI_BATTERY_FORMAT_BST};
+ struct acpi_buffer data = {0, NULL};
+ union acpi_object *package = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_battery_get_status");
+
+ if (!battery || !bst)
+ return_VALUE(-EINVAL);
+
+ /* Evalute _BST */
+
+ status = acpi_evaluate_object(battery->handle, "_BST", NULL, &buffer);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BST\n"));
+ return_VALUE(-ENODEV);
+ }
+
+ package = (union acpi_object *) buffer.pointer;
+
+ /* Extract Package Data */
+
+ status = acpi_extract_package(package, &format, &data);
+ if (status != AE_BUFFER_OVERFLOW) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BST\n"));
+ result = -ENODEV;
+ goto end;
+ }
+
+ data.pointer = kmalloc(data.length, GFP_KERNEL);
+ if (!data.pointer) {
+ result = -ENOMEM;
+ goto end;
+ }
+ memset(data.pointer, 0, data.length);
+
+ status = acpi_extract_package(package, &format, &data);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BST\n"));
+ kfree(data.pointer);
+ result = -ENODEV;
+ goto end;
+ }
+
+end:
+ acpi_os_free(buffer.pointer);
+
+ if (!result)
+ (*bst) = (struct acpi_battery_status *) data.pointer;
+
+ return_VALUE(result);
+}
+
+
+static int
+acpi_battery_set_alarm (
+ struct acpi_battery *battery,
+ unsigned long alarm)
+{
+ acpi_status status = 0;
+ union acpi_object arg0 = {ACPI_TYPE_INTEGER};
+ struct acpi_object_list arg_list = {1, &arg0};
+
+ ACPI_FUNCTION_TRACE("acpi_battery_set_alarm");
+
+ if (!battery)
+ return_VALUE(-EINVAL);
+
+ if (!battery->flags.alarm)
+ return_VALUE(-ENODEV);
+
+ arg0.integer.value = alarm;
+
+ status = acpi_evaluate_object(battery->handle, "_BTP", &arg_list, NULL);
+ if (ACPI_FAILURE(status))
+ return_VALUE(-ENODEV);
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", (u32) alarm));
+
+ battery->alarm = alarm;
+
+ return_VALUE(0);
+}
+
+
+static int
+acpi_battery_check (
+ struct acpi_battery *battery)
+{
+ int result = 0;
+ acpi_status status = AE_OK;
+ acpi_handle handle = NULL;
+ struct acpi_device *device = NULL;
+ struct acpi_battery_info *bif = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_battery_check");
+
+ if (!battery)
+ return_VALUE(-EINVAL);
+
+ result = acpi_bus_get_device(battery->handle, &device);
+ if (result)
+ return_VALUE(result);
+
+ result = acpi_bus_get_status(device);
+ if (result)
+ return_VALUE(result);
+
+ /* Insertion? */
+
+ if (!battery->flags.present && device->status.battery_present) {
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery inserted\n"));
+
+ /* Evalute _BIF to get certain static information */
+
+ result = acpi_battery_get_info(battery, &bif);
+ if (result)
+ return_VALUE(result);
+
+ battery->flags.power_unit = bif->power_unit;
+ battery->trips.warning = bif->design_capacity_warning;
+ battery->trips.low = bif->design_capacity_low;
+ kfree(bif);
+
+ /* See if alarms are supported, and if so, set default */
+
+ status = acpi_get_handle(battery->handle, "_BTP", &handle);
+ if (ACPI_SUCCESS(status)) {
+ battery->flags.alarm = 1;
+ acpi_battery_set_alarm(battery, battery->trips.warning);
+ }
+ }
+
+ /* Removal? */
+
+ else if (battery->flags.present && !device->status.battery_present) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery removed\n"));
+ }
+
+ battery->flags.present = device->status.battery_present;
+
+ return_VALUE(result);
+}
+
+
+/* --------------------------------------------------------------------------
+ FS Interface (/proc)
+ -------------------------------------------------------------------------- */
+
+static struct proc_dir_entry *acpi_battery_dir;
+static int acpi_battery_read_info(struct seq_file *seq, void *offset)
+{
+ int result = 0;
+ struct acpi_battery *battery = (struct acpi_battery *) seq->private;
+ struct acpi_battery_info *bif = NULL;
+ char *units = "?";
+
+ ACPI_FUNCTION_TRACE("acpi_battery_read_info");
+
+ if (!battery)
+ goto end;
+
+ if (battery->flags.present)
+ seq_printf(seq, "present: yes\n");
+ else {
+ seq_printf(seq, "present: no\n");
+ goto end;
+ }
+
+ /* Battery Info (_BIF) */
+
+ result = acpi_battery_get_info(battery, &bif);
+ if (result || !bif) {
+ seq_printf(seq, "ERROR: Unable to read battery information\n");
+ goto end;
+ }
+
+ units = bif->power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
+
+ if (bif->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "design capacity: unknown\n");
+ else
+ seq_printf(seq, "design capacity: %d %sh\n",
+ (u32) bif->design_capacity, units);
+
+ if (bif->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "last full capacity: unknown\n");
+ else
+ seq_printf(seq, "last full capacity: %d %sh\n",
+ (u32) bif->last_full_capacity, units);
+
+ switch ((u32) bif->battery_technology) {
+ case 0:
+ seq_printf(seq, "battery technology: non-rechargeable\n");
+ break;
+ case 1:
+ seq_printf(seq, "battery technology: rechargeable\n");
+ break;
+ default:
+ seq_printf(seq, "battery technology: unknown\n");
+ break;
+ }
+
+ if (bif->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "design voltage: unknown\n");
+ else
+ seq_printf(seq, "design voltage: %d mV\n",
+ (u32) bif->design_voltage);
+
+ seq_printf(seq, "design capacity warning: %d %sh\n",
+ (u32) bif->design_capacity_warning, units);
+ seq_printf(seq, "design capacity low: %d %sh\n",
+ (u32) bif->design_capacity_low, units);
+ seq_printf(seq, "capacity granularity 1: %d %sh\n",
+ (u32) bif->battery_capacity_granularity_1, units);
+ seq_printf(seq, "capacity granularity 2: %d %sh\n",
+ (u32) bif->battery_capacity_granularity_2, units);
+ seq_printf(seq, "model number: %s\n",
+ bif->model_number);
+ seq_printf(seq, "serial number: %s\n",
+ bif->serial_number);
+ seq_printf(seq, "battery type: %s\n",
+ bif->battery_type);
+ seq_printf(seq, "OEM info: %s\n",
+ bif->oem_info);
+
+end:
+ kfree(bif);
+
+ return_VALUE(0);
+}
+
+static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
+{
+ return single_open(file, acpi_battery_read_info, PDE(inode)->data);
+}
+
+
+static int
+acpi_battery_read_state (struct seq_file *seq, void *offset)
+{
+ int result = 0;
+ struct acpi_battery *battery = (struct acpi_battery *) seq->private;
+ struct acpi_battery_status *bst = NULL;
+ char *units = "?";
+
+ ACPI_FUNCTION_TRACE("acpi_battery_read_state");
+
+ if (!battery)
+ goto end;
+
+ if (battery->flags.present)
+ seq_printf(seq, "present: yes\n");
+ else {
+ seq_printf(seq, "present: no\n");
+ goto end;
+ }
+
+ /* Battery Units */
+
+ units = battery->flags.power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
+
+ /* Battery Status (_BST) */
+
+ result = acpi_battery_get_status(battery, &bst);
+ if (result || !bst) {
+ seq_printf(seq, "ERROR: Unable to read battery status\n");
+ goto end;
+ }
+
+ if (!(bst->state & 0x04))
+ seq_printf(seq, "capacity state: ok\n");
+ else
+ seq_printf(seq, "capacity state: critical\n");
+
+ if ((bst->state & 0x01) && (bst->state & 0x02)){
+ seq_printf(seq, "charging state: charging/discharging\n");
+ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "Battery Charging and Discharging?\n"));
+ }
+ else if (bst->state & 0x01)
+ seq_printf(seq, "charging state: discharging\n");
+ else if (bst->state & 0x02)
+ seq_printf(seq, "charging state: charging\n");
+ else {
+ seq_printf(seq, "charging state: charged\n");
+ }
+
+ if (bst->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "present rate: unknown\n");
+ else
+ seq_printf(seq, "present rate: %d %s\n",
+ (u32) bst->present_rate, units);
+
+ if (bst->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "remaining capacity: unknown\n");
+ else
+ seq_printf(seq, "remaining capacity: %d %sh\n",
+ (u32) bst->remaining_capacity, units);
+
+ if (bst->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "present voltage: unknown\n");
+ else
+ seq_printf(seq, "present voltage: %d mV\n",
+ (u32) bst->present_voltage);
+
+end:
+ kfree(bst);
+
+ return_VALUE(0);
+}
+
+static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
+{
+ return single_open(file, acpi_battery_read_state, PDE(inode)->data);
+}
+
+
+static int
+acpi_battery_read_alarm (struct seq_file *seq, void *offset)
+{
+ struct acpi_battery *battery = (struct acpi_battery *) seq->private;
+ char *units = "?";
+
+ ACPI_FUNCTION_TRACE("acpi_battery_read_alarm");
+
+ if (!battery)
+ goto end;
+
+ if (!battery->flags.present) {
+ seq_printf(seq, "present: no\n");
+ goto end;
+ }
+
+ /* Battery Units */
+
+ units = battery->flags.power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
+
+ /* Battery Alarm */
+
+ seq_printf(seq, "alarm: ");
+ if (!battery->alarm)
+ seq_printf(seq, "unsupported\n");
+ else
+ seq_printf(seq, "%d %sh\n", (u32) battery->alarm, units);
+
+end:
+ return_VALUE(0);
+}
+
+
+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 = (struct seq_file *)file->private_data;
+ struct acpi_battery *battery = (struct acpi_battery *)m->private;
+
+ ACPI_FUNCTION_TRACE("acpi_battery_write_alarm");
+
+ if (!battery || (count > sizeof(alarm_string) - 1))
+ return_VALUE(-EINVAL);
+
+ if (!battery->flags.present)
+ return_VALUE(-ENODEV);
+
+ if (copy_from_user(alarm_string, buffer, count))
+ return_VALUE(-EFAULT);
+
+ alarm_string[count] = '\0';
+
+ result = acpi_battery_set_alarm(battery,
+ simple_strtoul(alarm_string, NULL, 0));
+ if (result)
+ return_VALUE(result);
+
+ return_VALUE(count);
+}
+
+static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
+{
+ return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
+}
+
+static struct file_operations acpi_battery_info_ops = {
+ .open = acpi_battery_info_open_fs,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .owner = THIS_MODULE,
+};
+
+static struct file_operations acpi_battery_state_ops = {
+ .open = acpi_battery_state_open_fs,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .owner = THIS_MODULE,
+};
+
+static struct file_operations acpi_battery_alarm_ops = {
+ .open = acpi_battery_alarm_open_fs,
+ .read = seq_read,
+ .write = acpi_battery_write_alarm,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .owner = THIS_MODULE,
+};
+
+static int
+acpi_battery_add_fs (
+ struct acpi_device *device)
+{
+ struct proc_dir_entry *entry = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_battery_add_fs");
+
+ if (!acpi_device_dir(device)) {
+ acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
+ acpi_battery_dir);
+ if (!acpi_device_dir(device))
+ return_VALUE(-ENODEV);
+ acpi_device_dir(device)->owner = THIS_MODULE;
+ }
+
+ /* 'info' [R] */
+ entry = create_proc_entry(ACPI_BATTERY_FILE_INFO,
+ S_IRUGO, acpi_device_dir(device));
+ if (!entry)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Unable to create '%s' fs entry\n",
+ ACPI_BATTERY_FILE_INFO));
+ else {
+ entry->proc_fops = &acpi_battery_info_ops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;
+ }
+
+ /* 'status' [R] */
+ entry = create_proc_entry(ACPI_BATTERY_FILE_STATUS,
+ S_IRUGO, acpi_device_dir(device));
+ if (!entry)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Unable to create '%s' fs entry\n",
+ ACPI_BATTERY_FILE_STATUS));
+ else {
+ entry->proc_fops = &acpi_battery_state_ops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;
+ }
+
+ /* 'alarm' [R/W] */
+ entry = create_proc_entry(ACPI_BATTERY_FILE_ALARM,
+ S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
+ if (!entry)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Unable to create '%s' fs entry\n",
+ ACPI_BATTERY_FILE_ALARM));
+ else {
+ entry->proc_fops = &acpi_battery_alarm_ops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;
+ }
+
+ return_VALUE(0);
+}
+
+
+static int
+acpi_battery_remove_fs (
+ struct acpi_device *device)
+{
+ ACPI_FUNCTION_TRACE("acpi_battery_remove_fs");
+
+ if (acpi_device_dir(device)) {
+ remove_proc_entry(ACPI_BATTERY_FILE_ALARM,
+ acpi_device_dir(device));
+ remove_proc_entry(ACPI_BATTERY_FILE_STATUS,
+ acpi_device_dir(device));
+ remove_proc_entry(ACPI_BATTERY_FILE_INFO,
+ acpi_device_dir(device));
+
+ remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
+ acpi_device_dir(device) = NULL;
+ }
+
+ return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+ Driver Interface
+ -------------------------------------------------------------------------- */
+
+static void
+acpi_battery_notify (
+ acpi_handle handle,
+ u32 event,
+ void *data)
+{
+ struct acpi_battery *battery = (struct acpi_battery *) data;
+ struct acpi_device *device = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_battery_notify");
+
+ if (!battery)
+ return_VOID;
+
+ if (acpi_bus_get_device(handle, &device))
+ return_VOID;
+
+ switch (event) {
+ case ACPI_BATTERY_NOTIFY_STATUS:
+ case ACPI_BATTERY_NOTIFY_INFO:
+ acpi_battery_check(battery);
+ acpi_bus_generate_event(device, event, battery->flags.present);
+ break;
+ default:
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Unsupported event [0x%x]\n", event));
+ break;
+ }
+
+ return_VOID;
+}
+
+
+static int
+acpi_battery_add (
+ struct acpi_device *device)
+{
+ int result = 0;
+ acpi_status status = 0;
+ struct acpi_battery *battery = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_battery_add");
+
+ if (!device)
+ return_VALUE(-EINVAL);
+
+ battery = kmalloc(sizeof(struct acpi_battery), GFP_KERNEL);
+ if (!battery)
+ return_VALUE(-ENOMEM);
+ memset(battery, 0, sizeof(struct acpi_battery));
+
+ battery->handle = device->handle;
+ strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
+ strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
+ acpi_driver_data(device) = battery;
+
+ result = acpi_battery_check(battery);
+ if (result)
+ goto end;
+
+ result = acpi_battery_add_fs(device);
+ if (result)
+ goto end;
+
+ status = acpi_install_notify_handler(battery->handle,
+ ACPI_DEVICE_NOTIFY, acpi_battery_notify, battery);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Error installing notify handler\n"));
+ 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) {
+ acpi_battery_remove_fs(device);
+ kfree(battery);
+ }
+
+ return_VALUE(result);
+}
+
+
+static int
+acpi_battery_remove (
+ struct acpi_device *device,
+ int type)
+{
+ acpi_status status = 0;
+ struct acpi_battery *battery = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_battery_remove");
+
+ if (!device || !acpi_driver_data(device))
+ return_VALUE(-EINVAL);
+
+ battery = (struct acpi_battery *) acpi_driver_data(device);
+
+ status = acpi_remove_notify_handler(battery->handle,
+ ACPI_DEVICE_NOTIFY, acpi_battery_notify);
+ if (ACPI_FAILURE(status))
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Error removing notify handler\n"));
+
+ acpi_battery_remove_fs(device);
+
+ kfree(battery);
+
+ return_VALUE(0);
+}
+
+
+static int __init
+acpi_battery_init (void)
+{
+ int result = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_battery_init");
+
+ acpi_battery_dir = proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
+ if (!acpi_battery_dir)
+ return_VALUE(-ENODEV);
+ acpi_battery_dir->owner = THIS_MODULE;
+
+ result = acpi_bus_register_driver(&acpi_battery_driver);
+ if (result < 0) {
+ remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
+ return_VALUE(-ENODEV);
+ }
+
+ return_VALUE(0);
+}
+
+
+static void __exit
+acpi_battery_exit (void)
+{
+ ACPI_FUNCTION_TRACE("acpi_battery_exit");
+
+ acpi_bus_unregister_driver(&acpi_battery_driver);
+
+ remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
+
+ return_VOID;
+}
+
+
+module_init(acpi_battery_init);
+module_exit(acpi_battery_exit);