diff options
Diffstat (limited to 'kernel/drivers/acpi/ac.c')
| -rw-r--r-- | kernel/drivers/acpi/ac.c | 462 |
1 files changed, 462 insertions, 0 deletions
diff --git a/kernel/drivers/acpi/ac.c b/kernel/drivers/acpi/ac.c new file mode 100644 index 000000000..bbcc2b5a7 --- /dev/null +++ b/kernel/drivers/acpi/ac.c @@ -0,0 +1,462 @@ +/* + * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $) + * + * 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/slab.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/dmi.h> +#include <linux/delay.h> +#ifdef CONFIG_ACPI_PROCFS_POWER +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#endif +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/acpi.h> +#include "battery.h" + +#define PREFIX "ACPI: " + +#define ACPI_AC_CLASS "ac_adapter" +#define ACPI_AC_DEVICE_NAME "AC Adapter" +#define ACPI_AC_FILE_STATE "state" +#define ACPI_AC_NOTIFY_STATUS 0x80 +#define ACPI_AC_STATUS_OFFLINE 0x00 +#define ACPI_AC_STATUS_ONLINE 0x01 +#define ACPI_AC_STATUS_UNKNOWN 0xFF + +#define _COMPONENT ACPI_AC_COMPONENT +ACPI_MODULE_NAME("ac"); + +MODULE_AUTHOR("Paul Diefenbaugh"); +MODULE_DESCRIPTION("ACPI AC Adapter Driver"); +MODULE_LICENSE("GPL"); + + +static int acpi_ac_add(struct acpi_device *device); +static int acpi_ac_remove(struct acpi_device *device); +static void acpi_ac_notify(struct acpi_device *device, u32 event); + +static const struct acpi_device_id ac_device_ids[] = { + {"ACPI0003", 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, ac_device_ids); + +#ifdef CONFIG_PM_SLEEP +static int acpi_ac_resume(struct device *dev); +#endif +static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume); + +#ifdef CONFIG_ACPI_PROCFS_POWER +extern struct proc_dir_entry *acpi_lock_ac_dir(void); +extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); +static int acpi_ac_open_fs(struct inode *inode, struct file *file); +#endif + + +static int ac_sleep_before_get_state_ms; + +static struct acpi_driver acpi_ac_driver = { + .name = "ac", + .class = ACPI_AC_CLASS, + .ids = ac_device_ids, + .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, + .ops = { + .add = acpi_ac_add, + .remove = acpi_ac_remove, + .notify = acpi_ac_notify, + }, + .drv.pm = &acpi_ac_pm, +}; + +struct acpi_ac { + struct power_supply *charger; + struct power_supply_desc charger_desc; + struct acpi_device * device; + unsigned long long state; + struct notifier_block battery_nb; +}; + +#define to_acpi_ac(x) power_supply_get_drvdata(x) + +#ifdef CONFIG_ACPI_PROCFS_POWER +static const struct file_operations acpi_ac_fops = { + .owner = THIS_MODULE, + .open = acpi_ac_open_fs, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; +#endif + +/* -------------------------------------------------------------------------- + AC Adapter Management + -------------------------------------------------------------------------- */ + +static int acpi_ac_get_state(struct acpi_ac *ac) +{ + acpi_status status = AE_OK; + + if (!ac) + return -EINVAL; + + status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, + &ac->state); + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, + "Error reading AC Adapter state")); + ac->state = ACPI_AC_STATUS_UNKNOWN; + return -ENODEV; + } + + return 0; +} + +/* -------------------------------------------------------------------------- + sysfs I/F + -------------------------------------------------------------------------- */ +static int get_ac_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct acpi_ac *ac = to_acpi_ac(psy); + + if (!ac) + return -ENODEV; + + if (acpi_ac_get_state(ac)) + return -ENODEV; + + switch (psp) { + case POWER_SUPPLY_PROP_ONLINE: + val->intval = ac->state; + break; + default: + return -EINVAL; + } + return 0; +} + +static enum power_supply_property ac_props[] = { + POWER_SUPPLY_PROP_ONLINE, +}; + +#ifdef CONFIG_ACPI_PROCFS_POWER +/* -------------------------------------------------------------------------- + FS Interface (/proc) + -------------------------------------------------------------------------- */ + +static struct proc_dir_entry *acpi_ac_dir; + +static int acpi_ac_seq_show(struct seq_file *seq, void *offset) +{ + struct acpi_ac *ac = seq->private; + + + if (!ac) + return 0; + + if (acpi_ac_get_state(ac)) { + seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); + return 0; + } + + seq_puts(seq, "state: "); + switch (ac->state) { + case ACPI_AC_STATUS_OFFLINE: + seq_puts(seq, "off-line\n"); + break; + case ACPI_AC_STATUS_ONLINE: + seq_puts(seq, "on-line\n"); + break; + default: + seq_puts(seq, "unknown\n"); + break; + } + + return 0; +} + +static int acpi_ac_open_fs(struct inode *inode, struct file *file) +{ + return single_open(file, acpi_ac_seq_show, PDE_DATA(inode)); +} + +static int acpi_ac_add_fs(struct acpi_ac *ac) +{ + struct proc_dir_entry *entry = NULL; + + printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded," + " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); + if (!acpi_device_dir(ac->device)) { + acpi_device_dir(ac->device) = + proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir); + if (!acpi_device_dir(ac->device)) + return -ENODEV; + } + + /* 'state' [R] */ + entry = proc_create_data(ACPI_AC_FILE_STATE, + S_IRUGO, acpi_device_dir(ac->device), + &acpi_ac_fops, ac); + if (!entry) + return -ENODEV; + return 0; +} + +static int acpi_ac_remove_fs(struct acpi_ac *ac) +{ + + if (acpi_device_dir(ac->device)) { + remove_proc_entry(ACPI_AC_FILE_STATE, + acpi_device_dir(ac->device)); + remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir); + acpi_device_dir(ac->device) = NULL; + } + + return 0; +} +#endif + +/* -------------------------------------------------------------------------- + Driver Model + -------------------------------------------------------------------------- */ + +static void acpi_ac_notify(struct acpi_device *device, u32 event) +{ + struct acpi_ac *ac = acpi_driver_data(device); + + if (!ac) + return; + + switch (event) { + default: + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Unsupported event [0x%x]\n", event)); + case ACPI_AC_NOTIFY_STATUS: + case ACPI_NOTIFY_BUS_CHECK: + case ACPI_NOTIFY_DEVICE_CHECK: + /* + * A buggy BIOS may notify AC first and then sleep for + * a specific time before doing actual operations in the + * EC event handler (_Qxx). This will cause the AC state + * reported by the ACPI event to be incorrect, so wait for a + * specific time for the EC event handler to make progress. + */ + if (ac_sleep_before_get_state_ms > 0) + msleep(ac_sleep_before_get_state_ms); + + acpi_ac_get_state(ac); + acpi_bus_generate_netlink_event(device->pnp.device_class, + dev_name(&device->dev), event, + (u32) ac->state); + acpi_notifier_call_chain(device, event, (u32) ac->state); + kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); + } + + return; +} + +static int acpi_ac_battery_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb); + struct acpi_bus_event *event = (struct acpi_bus_event *)data; + + /* + * On HP Pavilion dv6-6179er AC status notifications aren't triggered + * when adapter is plugged/unplugged. However, battery status + * notifcations are triggered when battery starts charging or + * discharging. Re-reading AC status triggers lost AC notifications, + * if AC status has changed. + */ + if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 && + event->type == ACPI_BATTERY_NOTIFY_STATUS) + acpi_ac_get_state(ac); + + return NOTIFY_OK; +} + +static int thinkpad_e530_quirk(const struct dmi_system_id *d) +{ + ac_sleep_before_get_state_ms = 1000; + return 0; +} + +static struct dmi_system_id ac_dmi_table[] = { + { + .callback = thinkpad_e530_quirk, + .ident = "thinkpad e530", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"), + }, + }, + {}, +}; + +static int acpi_ac_add(struct acpi_device *device) +{ + struct power_supply_config psy_cfg = {}; + int result = 0; + struct acpi_ac *ac = NULL; + + + if (!device) + return -EINVAL; + + ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); + if (!ac) + return -ENOMEM; + + ac->device = device; + strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); + strcpy(acpi_device_class(device), ACPI_AC_CLASS); + device->driver_data = ac; + + result = acpi_ac_get_state(ac); + if (result) + goto end; + + psy_cfg.drv_data = ac; + + ac->charger_desc.name = acpi_device_bid(device); +#ifdef CONFIG_ACPI_PROCFS_POWER + result = acpi_ac_add_fs(ac); + if (result) + goto end; +#endif + ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS; + ac->charger_desc.properties = ac_props; + ac->charger_desc.num_properties = ARRAY_SIZE(ac_props); + ac->charger_desc.get_property = get_ac_property; + ac->charger = power_supply_register(&ac->device->dev, + &ac->charger_desc, &psy_cfg); + if (IS_ERR(ac->charger)) { + result = PTR_ERR(ac->charger); + goto end; + } + + printk(KERN_INFO PREFIX "%s [%s] (%s)\n", + acpi_device_name(device), acpi_device_bid(device), + ac->state ? "on-line" : "off-line"); + + ac->battery_nb.notifier_call = acpi_ac_battery_notify; + register_acpi_notifier(&ac->battery_nb); +end: + if (result) { +#ifdef CONFIG_ACPI_PROCFS_POWER + acpi_ac_remove_fs(ac); +#endif + kfree(ac); + } + + dmi_check_system(ac_dmi_table); + return result; +} + +#ifdef CONFIG_PM_SLEEP +static int acpi_ac_resume(struct device *dev) +{ + struct acpi_ac *ac; + unsigned old_state; + + if (!dev) + return -EINVAL; + + ac = acpi_driver_data(to_acpi_device(dev)); + if (!ac) + return -EINVAL; + + old_state = ac->state; + if (acpi_ac_get_state(ac)) + return 0; + if (old_state != ac->state) + kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); + return 0; +} +#else +#define acpi_ac_resume NULL +#endif + +static int acpi_ac_remove(struct acpi_device *device) +{ + struct acpi_ac *ac = NULL; + + + if (!device || !acpi_driver_data(device)) + return -EINVAL; + + ac = acpi_driver_data(device); + + power_supply_unregister(ac->charger); + unregister_acpi_notifier(&ac->battery_nb); + +#ifdef CONFIG_ACPI_PROCFS_POWER + acpi_ac_remove_fs(ac); +#endif + + kfree(ac); + + return 0; +} + +static int __init acpi_ac_init(void) +{ + int result; + + if (acpi_disabled) + return -ENODEV; + +#ifdef CONFIG_ACPI_PROCFS_POWER + acpi_ac_dir = acpi_lock_ac_dir(); + if (!acpi_ac_dir) + return -ENODEV; +#endif + + + result = acpi_bus_register_driver(&acpi_ac_driver); + if (result < 0) { +#ifdef CONFIG_ACPI_PROCFS_POWER + acpi_unlock_ac_dir(acpi_ac_dir); +#endif + return -ENODEV; + } + + return 0; +} + +static void __exit acpi_ac_exit(void) +{ + acpi_bus_unregister_driver(&acpi_ac_driver); +#ifdef CONFIG_ACPI_PROCFS_POWER + acpi_unlock_ac_dir(acpi_ac_dir); +#endif +} +module_init(acpi_ac_init); +module_exit(acpi_ac_exit); |