1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  acpi_ac.c - ACPI AC Adapter Driver (Revision: 27)
9 #define pr_fmt(fmt) "ACPI: AC: " fmt
25 #define ACPI_AC_DEVICE_NAME		"AC Adapter"
33 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
56 	struct power_supply *charger;  member
65 /* AC Adapter Management */
66 static int acpi_ac_get_state(struct acpi_ac *ac)  in acpi_ac_get_state()  argument
70 	if (!ac)  in acpi_ac_get_state()
71 		return -EINVAL;  in acpi_ac_get_state()
74 		ac->state = 1;  in acpi_ac_get_state()
78 	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,  in acpi_ac_get_state()
79 				       &ac->state);  in acpi_ac_get_state()
81 		acpi_handle_info(ac->device->handle,  in acpi_ac_get_state()
82 				"Error reading AC Adapter state: %s\n",  in acpi_ac_get_state()
84 		ac->state = ACPI_AC_STATUS_UNKNOWN;  in acpi_ac_get_state()
85 		return -ENODEV;  in acpi_ac_get_state()
96 	struct acpi_ac *ac = to_acpi_ac(psy);  in get_ac_property()  local
98 	if (!ac)  in get_ac_property()
99 		return -ENODEV;  in get_ac_property()
101 	if (acpi_ac_get_state(ac))  in get_ac_property()
102 		return -ENODEV;  in get_ac_property()
106 		val->intval = ac->state;  in get_ac_property()
109 		return -EINVAL;  in get_ac_property()
122 	struct acpi_ac *ac = data;  in acpi_ac_notify()  local
123 	struct acpi_device *adev = ac->device;  in acpi_ac_notify()
127 		acpi_handle_debug(adev->handle, "Unsupported event [0x%x]\n",  in acpi_ac_notify()
134 		 * A buggy BIOS may notify AC first and then sleep for  in acpi_ac_notify()
136 		 * EC event handler (_Qxx). This will cause the AC state  in acpi_ac_notify()
143 		acpi_ac_get_state(ac);  in acpi_ac_notify()
144 		acpi_bus_generate_netlink_event(adev->pnp.device_class,  in acpi_ac_notify()
145 						  dev_name(&adev->dev), event,  in acpi_ac_notify()
146 						  (u32) ac->state);  in acpi_ac_notify()
147 		acpi_notifier_call_chain(adev, event, (u32) ac->state);  in acpi_ac_notify()
148 		power_supply_changed(ac->charger);  in acpi_ac_notify()
155 	struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);  in acpi_ac_battery_notify()  local
159 	 * On HP Pavilion dv6-6179er AC status notifications aren't triggered  in acpi_ac_battery_notify()
162 	 * discharging. Re-reading AC status triggers lost AC notifications,  in acpi_ac_battery_notify()
163 	 * if AC status has changed.  in acpi_ac_battery_notify()
165 	if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&  in acpi_ac_battery_notify()
166 	    event->type == ACPI_BATTERY_NOTIFY_STATUS)  in acpi_ac_battery_notify()
167 		acpi_ac_get_state(ac);  in acpi_ac_battery_notify()
206 	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);  in acpi_ac_probe()
208 	struct acpi_ac *ac;  in acpi_ac_probe()  local
211 	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);  in acpi_ac_probe()
212 	if (!ac)  in acpi_ac_probe()
213 		return -ENOMEM;  in acpi_ac_probe()
215 	ac->device = adev;  in acpi_ac_probe()
219 	platform_set_drvdata(pdev, ac);  in acpi_ac_probe()
221 	result = acpi_ac_get_state(ac);  in acpi_ac_probe()
225 	psy_cfg.drv_data = ac;  in acpi_ac_probe()
227 	ac->charger_desc.name = acpi_device_bid(adev);  in acpi_ac_probe()
228 	ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;  in acpi_ac_probe()
229 	ac->charger_desc.properties = ac_props;  in acpi_ac_probe()
230 	ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);  in acpi_ac_probe()
231 	ac->charger_desc.get_property = get_ac_property;  in acpi_ac_probe()
232 	ac->charger = power_supply_register(&pdev->dev,  in acpi_ac_probe()
233 					    &ac->charger_desc, &psy_cfg);  in acpi_ac_probe()
234 	if (IS_ERR(ac->charger)) {  in acpi_ac_probe()
235 		result = PTR_ERR(ac->charger);  in acpi_ac_probe()
239 	pr_info("%s [%s] (%s-line)\n", acpi_device_name(adev),  in acpi_ac_probe()
240 		acpi_device_bid(adev), str_on_off(ac->state));  in acpi_ac_probe()
242 	ac->battery_nb.notifier_call = acpi_ac_battery_notify;  in acpi_ac_probe()
243 	register_acpi_notifier(&ac->battery_nb);  in acpi_ac_probe()
246 						 acpi_ac_notify, ac);  in acpi_ac_probe()
253 	power_supply_unregister(ac->charger);  in acpi_ac_probe()
254 	unregister_acpi_notifier(&ac->battery_nb);  in acpi_ac_probe()
256 	kfree(ac);  in acpi_ac_probe()
264 	struct acpi_ac *ac = dev_get_drvdata(dev);  in acpi_ac_resume()  local
267 	old_state = ac->state;  in acpi_ac_resume()
268 	if (acpi_ac_get_state(ac))  in acpi_ac_resume()
270 	if (old_state != ac->state)  in acpi_ac_resume()
271 		power_supply_changed(ac->charger);  in acpi_ac_resume()
281 	struct acpi_ac *ac = platform_get_drvdata(pdev);  in acpi_ac_remove()  local
283 	acpi_dev_remove_notify_handler(ac->device, ACPI_ALL_NOTIFY,  in acpi_ac_remove()
285 	power_supply_unregister(ac->charger);  in acpi_ac_remove()
286 	unregister_acpi_notifier(&ac->battery_nb);  in acpi_ac_remove()
288 	kfree(ac);  in acpi_ac_remove()
295 		.name = "ac",
306 		return -ENODEV;  in acpi_ac_init()
309 		return -ENODEV;  in acpi_ac_init()
315 		return -ENODEV;  in acpi_ac_init()