1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/dmi.h>
15 #include <linux/delay.h>
16 #include <linux/platform_device.h>
17 #include <linux/power_supply.h>
18 #include <linux/acpi.h>
19 #include <acpi/battery.h>
21 #define PREFIX "ACPI: "
23 #define ACPI_AC_CLASS "ac_adapter"
24 #define ACPI_AC_DEVICE_NAME "AC Adapter"
25 #define ACPI_AC_FILE_STATE "state"
26 #define ACPI_AC_NOTIFY_STATUS 0x80
27 #define ACPI_AC_STATUS_OFFLINE 0x00
28 #define ACPI_AC_STATUS_ONLINE 0x01
29 #define ACPI_AC_STATUS_UNKNOWN 0xFF
31 #define _COMPONENT ACPI_AC_COMPONENT
32 ACPI_MODULE_NAME("ac");
34 MODULE_AUTHOR("Paul Diefenbaugh");
35 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
36 MODULE_LICENSE("GPL");
39 static int acpi_ac_add(struct acpi_device *device);
40 static int acpi_ac_remove(struct acpi_device *device);
41 static void acpi_ac_notify(struct acpi_device *device, u32 event);
48 static const struct acpi_device_id ac_device_ids[] = {
52 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
54 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
55 static const struct acpi_ac_bl acpi_ac_blacklist[] = {
56 { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
57 { "INT34D3", 3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
60 #ifdef CONFIG_PM_SLEEP
61 static int acpi_ac_resume(struct device *dev);
63 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
65 static int ac_sleep_before_get_state_ms;
66 static int ac_check_pmic = 1;
69 static struct acpi_driver acpi_ac_driver = {
71 .class = ACPI_AC_CLASS,
73 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
76 .remove = acpi_ac_remove,
77 .notify = acpi_ac_notify,
79 .drv.pm = &acpi_ac_pm,
83 struct power_supply *charger;
84 struct power_supply_desc charger_desc;
85 struct acpi_device * device;
86 unsigned long long state;
87 struct notifier_block battery_nb;
90 #define to_acpi_ac(x) power_supply_get_drvdata(x)
92 /* --------------------------------------------------------------------------
94 -------------------------------------------------------------------------- */
96 static int acpi_ac_get_state(struct acpi_ac *ac)
98 acpi_status status = AE_OK;
108 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
110 if (ACPI_FAILURE(status)) {
111 ACPI_EXCEPTION((AE_INFO, status,
112 "Error reading AC Adapter state"));
113 ac->state = ACPI_AC_STATUS_UNKNOWN;
120 /* --------------------------------------------------------------------------
122 -------------------------------------------------------------------------- */
123 static int get_ac_property(struct power_supply *psy,
124 enum power_supply_property psp,
125 union power_supply_propval *val)
127 struct acpi_ac *ac = to_acpi_ac(psy);
132 if (acpi_ac_get_state(ac))
136 case POWER_SUPPLY_PROP_ONLINE:
137 val->intval = ac->state;
145 static enum power_supply_property ac_props[] = {
146 POWER_SUPPLY_PROP_ONLINE,
149 /* --------------------------------------------------------------------------
151 -------------------------------------------------------------------------- */
153 static void acpi_ac_notify(struct acpi_device *device, u32 event)
155 struct acpi_ac *ac = acpi_driver_data(device);
162 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
163 "Unsupported event [0x%x]\n", event));
165 case ACPI_AC_NOTIFY_STATUS:
166 case ACPI_NOTIFY_BUS_CHECK:
167 case ACPI_NOTIFY_DEVICE_CHECK:
169 * A buggy BIOS may notify AC first and then sleep for
170 * a specific time before doing actual operations in the
171 * EC event handler (_Qxx). This will cause the AC state
172 * reported by the ACPI event to be incorrect, so wait for a
173 * specific time for the EC event handler to make progress.
175 if (ac_sleep_before_get_state_ms > 0)
176 msleep(ac_sleep_before_get_state_ms);
178 acpi_ac_get_state(ac);
179 acpi_bus_generate_netlink_event(device->pnp.device_class,
180 dev_name(&device->dev), event,
182 acpi_notifier_call_chain(device, event, (u32) ac->state);
183 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
189 static int acpi_ac_battery_notify(struct notifier_block *nb,
190 unsigned long action, void *data)
192 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
193 struct acpi_bus_event *event = (struct acpi_bus_event *)data;
196 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
197 * when adapter is plugged/unplugged. However, battery status
198 * notifcations are triggered when battery starts charging or
199 * discharging. Re-reading AC status triggers lost AC notifications,
200 * if AC status has changed.
202 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
203 event->type == ACPI_BATTERY_NOTIFY_STATUS)
204 acpi_ac_get_state(ac);
209 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
211 ac_sleep_before_get_state_ms = 1000;
215 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
221 static int __init ac_only_quirk(const struct dmi_system_id *d)
227 /* Please keep this list alphabetically sorted */
228 static const struct dmi_system_id ac_dmi_table[] __initconst = {
230 /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
231 .callback = ac_do_not_check_pmic_quirk,
233 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
237 /* Kodlix GK45 returning incorrect state */
238 .callback = ac_only_quirk,
240 DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
244 /* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
245 .callback = ac_do_not_check_pmic_quirk,
247 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
248 DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
249 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
253 /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
254 .callback = thinkpad_e530_quirk,
256 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
257 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
263 static int acpi_ac_add(struct acpi_device *device)
265 struct power_supply_config psy_cfg = {};
267 struct acpi_ac *ac = NULL;
273 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
278 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
279 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
280 device->driver_data = ac;
282 result = acpi_ac_get_state(ac);
286 psy_cfg.drv_data = ac;
288 ac->charger_desc.name = acpi_device_bid(device);
289 ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
290 ac->charger_desc.properties = ac_props;
291 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
292 ac->charger_desc.get_property = get_ac_property;
293 ac->charger = power_supply_register(&ac->device->dev,
294 &ac->charger_desc, &psy_cfg);
295 if (IS_ERR(ac->charger)) {
296 result = PTR_ERR(ac->charger);
300 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
301 acpi_device_name(device), acpi_device_bid(device),
302 ac->state ? "on-line" : "off-line");
304 ac->battery_nb.notifier_call = acpi_ac_battery_notify;
305 register_acpi_notifier(&ac->battery_nb);
314 #ifdef CONFIG_PM_SLEEP
315 static int acpi_ac_resume(struct device *dev)
323 ac = acpi_driver_data(to_acpi_device(dev));
327 old_state = ac->state;
328 if (acpi_ac_get_state(ac))
330 if (old_state != ac->state)
331 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
335 #define acpi_ac_resume NULL
338 static int acpi_ac_remove(struct acpi_device *device)
340 struct acpi_ac *ac = NULL;
343 if (!device || !acpi_driver_data(device))
346 ac = acpi_driver_data(device);
348 power_supply_unregister(ac->charger);
349 unregister_acpi_notifier(&ac->battery_nb);
356 static int __init acpi_ac_init(void)
364 dmi_check_system(ac_dmi_table);
367 for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
368 if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
369 acpi_ac_blacklist[i].hrv)) {
370 pr_info(PREFIX "AC: found native %s PMIC, not loading\n",
371 acpi_ac_blacklist[i].hid);
376 result = acpi_bus_register_driver(&acpi_ac_driver);
384 static void __exit acpi_ac_exit(void)
386 acpi_bus_unregister_driver(&acpi_ac_driver);
388 module_init(acpi_ac_init);
389 module_exit(acpi_ac_exit);