// 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> */ #define pr_fmt(fmt) "ACPI: AC: " fmt #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>#include <linux/platform_device.h>#include <linux/power_supply.h>#include <linux/string_choices.h>#include <linux/acpi.h>#include <acpi/battery.h> #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 MODULE_AUTHOR("Paul Diefenbaugh");MODULE_DESCRIPTION("ACPI AC Adapter Driver");MODULE_LICENSE("GPL"); static const struct acpi_device_id ac_device_ids[] = {	{"ACPI0003", 0},	{"", 0},};MODULE_DEVICE_TABLE(acpi, ac_device_ids); static int ac_sleep_before_get_state_ms;static int ac_only; 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; 	if (ac_only) {		ac->state = 1;		return 0;	} 	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,				       &ac->state);	if (ACPI_FAILURE(status)) {		acpi_handle_info(ac->device->handle,				"Error reading AC Adapter state: %s\n",				acpi_format_exception(status));		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 const enum power_supply_property ac_props[] = {	POWER_SUPPLY_PROP_ONLINE,}; /* Driver Model */static void acpi_ac_notify(acpi_handle handle, u32 event, void *data){	struct acpi_ac *ac = data;	struct acpi_device *adev = ac->device; 	switch (event) {	default:		acpi_handle_debug(adev->handle, "Unsupported event [0x%x]\n",				  event);		fallthrough;	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(ACPI_AC_CLASS,						dev_name(&adev->dev), event,						ac->state);		acpi_notifier_call_chain(ACPI_AC_CLASS, acpi_device_bid(adev),					 event, ac->state);		power_supply_changed(ac->charger);	}} 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	 * notifications 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_only_quirk(const struct dmi_system_id *d){	ac_only = 1;	return 0;} /* Please keep this list alphabetically sorted */static const struct dmi_system_id ac_dmi_table[]  __initconst = {	{		/* Kodlix GK45 returning incorrect state */		.callback = ac_only_quirk,		.matches = {			DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),		},	},	{		/* 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_probe(struct platform_device *pdev){	struct power_supply_config psy_cfg = {};	struct device *dev = &pdev->dev;	struct acpi_device *adev;	struct acpi_ac *ac;	int result; 	adev = ACPI_COMPANION(&pdev->dev);	if (!adev)		return -ENODEV; 	ac = devm_kzalloc(dev, sizeof(*ac), GFP_KERNEL);	if (!ac)		return -ENOMEM; 	ac->device = adev; 	platform_set_drvdata(pdev, ac); 	result = acpi_ac_get_state(ac);	if (result)		return result; 	psy_cfg.drv_data = ac; 	ac->charger_desc.name = acpi_device_bid(adev);	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 = devm_power_supply_register(dev, &ac->charger_desc, &psy_cfg);	if (IS_ERR(ac->charger))		return PTR_ERR(ac->charger); 	pr_info("AC Adapter [%s] (%s-line)\n", acpi_device_bid(adev),		str_on_off(ac->state)); 	result = devm_acpi_install_notify_handler(dev, ACPI_ALL_NOTIFY,						  acpi_ac_notify, ac);	if (result)		return result; 	ac->battery_nb.notifier_call = acpi_ac_battery_notify;	register_acpi_notifier(&ac->battery_nb); 	return 0;} #ifdef CONFIG_PM_SLEEPstatic int acpi_ac_resume(struct device *dev){	struct acpi_ac *ac = dev_get_drvdata(dev);	unsigned int old_state; 	old_state = ac->state;	if (acpi_ac_get_state(ac))		return 0;	if (old_state != ac->state)		power_supply_changed(ac->charger); 	return 0;}#endif static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume); static void acpi_ac_remove(struct platform_device *pdev){	struct acpi_ac *ac = platform_get_drvdata(pdev); 	unregister_acpi_notifier(&ac->battery_nb);} static struct platform_driver acpi_ac_driver = {	.probe = acpi_ac_probe,	.remove = acpi_ac_remove,	.driver = {		.name = "ac",		.acpi_match_table = ac_device_ids,		.pm = &acpi_ac_pm,	},}; static int __init acpi_ac_init(void){	int result; 	if (acpi_disabled)		return -ENODEV; 	if (acpi_quirk_skip_acpi_ac_and_battery())		return -ENODEV; 	dmi_check_system(ac_dmi_table); 	result = platform_driver_register(&acpi_ac_driver);	if (result < 0)		return -ENODEV; 	return 0;} static void __exit acpi_ac_exit(void){	platform_driver_unregister(&acpi_ac_driver);}module_init(acpi_ac_init);module_exit(acpi_ac_exit);