drivers/acpi/ac.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  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>
  */

 #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 <acpi/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);

 struct acpi_ac_bl {
 	const char *hid;
 	int hrv;
 };

 static const struct acpi_device_id ac_device_ids[] = {
 	{"ACPI0003", 0},
 	{"", 0},
 };
 MODULE_DEVICE_TABLE(acpi, ac_device_ids);

 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
 static const struct acpi_ac_bl acpi_ac_blacklist[] = {
 	{ "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
 	{ "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
 };

 #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);
 #endif


 static int ac_sleep_before_get_state_ms;
 static int ac_check_pmic = 1;

 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)

 /* --------------------------------------------------------------------------
                                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_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_single_data(ACPI_AC_FILE_STATE, S_IRUGO,
 			acpi_device_dir(ac->device), acpi_ac_seq_show, 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));
 	/* fall through */
 	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 __init thinkpad_e530_quirk(const struct dmi_system_id *d)
 {
 	ac_sleep_before_get_state_ms = 1000;
 	return 0;
 }

 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
 {
 	ac_check_pmic = 0;
 	return 0;
 }

 /* Please keep this list alphabetically sorted */
 static const struct dmi_system_id ac_dmi_table[]  __initconst = {
 	{
 		/* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
 		.callback = ac_do_not_check_pmic_quirk,
 		.matches = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
 		},
 	},
 	{
 		/* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
 		.callback = ac_do_not_check_pmic_quirk,
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
 		},
 	},
 	{
 		/* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
 		.callback = thinkpad_e530_quirk,
 		.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);
 	}

 	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)
 {
 	unsigned int i;
 	int result;

 	if (acpi_disabled)
 		return -ENODEV;

 	dmi_check_system(ac_dmi_table);

 	if (ac_check_pmic) {
 		for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
 			if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
 					     acpi_ac_blacklist[i].hrv)) {
 				pr_info(PREFIX "AC: found native %s PMIC, not loading\n",
 					acpi_ac_blacklist[i].hid);
 				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);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* 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>
	*/

	#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 <acpi/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);

	struct acpi_ac_bl {
	const char *hid;
	int hrv;
	};

	static const struct acpi_device_id ac_device_ids[] = {
	{"ACPI0003", 0},
	{"", 0},
	};
	MODULE_DEVICE_TABLE(acpi, ac_device_ids);

	/* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
	static const struct acpi_ac_bl acpi_ac_blacklist[] = {
	{ "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
	{ "INT34D3", 3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
	};

	#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);
	#endif


	static int ac_sleep_before_get_state_ms;
	static int ac_check_pmic = 1;

	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)

	/* --------------------------------------------------------------------------
	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_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_single_data(ACPI_AC_FILE_STATE, S_IRUGO,
	acpi_device_dir(ac->device), acpi_ac_seq_show, 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));
	/* fall through */
	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 __init thinkpad_e530_quirk(const struct dmi_system_id *d)
	{
	ac_sleep_before_get_state_ms = 1000;
	return 0;
	}

	static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
	{
	ac_check_pmic = 0;
	return 0;
	}

	/* Please keep this list alphabetically sorted */
	static const struct dmi_system_id ac_dmi_table[] __initconst = {
	{
	/* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
	.callback = ac_do_not_check_pmic_quirk,
	.matches = {
	DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
	},
	},
	{
	/* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
	.callback = ac_do_not_check_pmic_quirk,
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
	DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
	},
	},
	{
	/* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
	.callback = thinkpad_e530_quirk,
	.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);
	}

	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)
	{
	unsigned int i;
	int result;

	if (acpi_disabled)
	return -ENODEV;

	dmi_check_system(ac_dmi_table);

	if (ac_check_pmic) {
	for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
	if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
	acpi_ac_blacklist[i].hrv)) {
	pr_info(PREFIX "AC: found native %s PMIC, not loading\n",
	acpi_ac_blacklist[i].hid);
	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);