3  *  acpi_ac.c - ACPI AC Adapter Driver (Revision: 27)
9 #define pr_fmt(fmt) "ACPI: AC: " fmt
24 #define ACPI_AC_DEVICE_NAME		"AC Adapter"
32 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
54 	.name = "ac",
74 /* AC Adapter Management */
75 static int acpi_ac_get_state(struct acpi_ac *ac)  in acpi_ac_get_state()  argument
79 	if (!ac)  in acpi_ac_get_state()
83 		ac->state = 1;  in acpi_ac_get_state()
87 	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,  in acpi_ac_get_state()
88 				       &ac->state);  in acpi_ac_get_state()
90 		acpi_handle_info(ac->device->handle,  in acpi_ac_get_state()
91 				"Error reading AC Adapter state: %s\n",  in acpi_ac_get_state()
93 		ac->state = ACPI_AC_STATUS_UNKNOWN;  in acpi_ac_get_state()
105 	struct acpi_ac *ac = to_acpi_ac(psy);  in get_ac_property()  local
107 	if (!ac)  in get_ac_property()
110 	if (acpi_ac_get_state(ac))  in get_ac_property()
115 		val->intval = ac->state;  in get_ac_property()
132 	struct acpi_ac *ac = acpi_driver_data(device);  in acpi_ac_notify()  local
134 	if (!ac)  in acpi_ac_notify()
146 		 * A buggy BIOS may notify AC first and then sleep for  in acpi_ac_notify()
148 		 * EC event handler (_Qxx). This will cause the AC state  in acpi_ac_notify()
155 		acpi_ac_get_state(ac);  in acpi_ac_notify()
158 						  (u32) ac->state);  in acpi_ac_notify()
159 		acpi_notifier_call_chain(device, event, (u32) ac->state);  in acpi_ac_notify()
160 		kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);  in acpi_ac_notify()
167 	struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);  in acpi_ac_battery_notify()  local
171 	 * On HP Pavilion dv6-6179er AC status notifications aren't triggered  in acpi_ac_battery_notify()
174 	 * discharging. Re-reading AC status triggers lost AC notifications,  in acpi_ac_battery_notify()
175 	 * if AC status has changed.  in acpi_ac_battery_notify()
179 		acpi_ac_get_state(ac);  in acpi_ac_battery_notify()
220 	struct acpi_ac *ac = NULL;  in acpi_ac_add()  local
226 	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);  in acpi_ac_add()
227 	if (!ac)  in acpi_ac_add()
230 	ac->device = device;  in acpi_ac_add()
233 	device->driver_data = ac;  in acpi_ac_add()
235 	result = acpi_ac_get_state(ac);  in acpi_ac_add()
239 	psy_cfg.drv_data = ac;  in acpi_ac_add()
241 	ac->charger_desc.name = acpi_device_bid(device);  in acpi_ac_add()
242 	ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;  in acpi_ac_add()
243 	ac->charger_desc.properties = ac_props;  in acpi_ac_add()
244 	ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);  in acpi_ac_add()
245 	ac->charger_desc.get_property = get_ac_property;  in acpi_ac_add()
246 	ac->charger = power_supply_register(&ac->device->dev,  in acpi_ac_add()
247 					    &ac->charger_desc, &psy_cfg);  in acpi_ac_add()
248 	if (IS_ERR(ac->charger)) {  in acpi_ac_add()
249 		result = PTR_ERR(ac->charger);  in acpi_ac_add()
254 		acpi_device_bid(device), ac->state ? "on-line" : "off-line");  in acpi_ac_add()
256 	ac->battery_nb.notifier_call = acpi_ac_battery_notify;  in acpi_ac_add()
257 	register_acpi_notifier(&ac->battery_nb);  in acpi_ac_add()
267 	power_supply_unregister(ac->charger);  in acpi_ac_add()
268 	unregister_acpi_notifier(&ac->battery_nb);  in acpi_ac_add()
270 	kfree(ac);  in acpi_ac_add()
278 	struct acpi_ac *ac;  in acpi_ac_resume()  local
284 	ac = acpi_driver_data(to_acpi_device(dev));  in acpi_ac_resume()
285 	if (!ac)  in acpi_ac_resume()
288 	old_state = ac->state;  in acpi_ac_resume()
289 	if (acpi_ac_get_state(ac))  in acpi_ac_resume()
291 	if (old_state != ac->state)  in acpi_ac_resume()
292 		kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);  in acpi_ac_resume()
302 	struct acpi_ac *ac = NULL;  in acpi_ac_remove()  local
307 	ac = acpi_driver_data(device);  in acpi_ac_remove()
311 	power_supply_unregister(ac->charger);  in acpi_ac_remove()
312 	unregister_acpi_notifier(&ac->battery_nb);  in acpi_ac_remove()
314 	kfree(ac);  in acpi_ac_remove()