xref: /openbmc/linux/drivers/acpi/ac.c (revision 8cb5d216) 
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  acpi_ac.c - ACPI AC Adapter Driver (Revision: 27)
4  *
5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7  */
8 
9 #define pr_fmt(fmt) "ACPI: AC: " fmt
10 
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/init.h>
15 #include <linux/types.h>
16 #include <linux/dmi.h>
17 #include <linux/delay.h>
18 #include <linux/platform_device.h>
19 #include <linux/power_supply.h>
20 #include <linux/acpi.h>
21 #include <acpi/battery.h>
22 
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
30 
31 MODULE_AUTHOR("Paul Diefenbaugh");
32 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
33 MODULE_LICENSE("GPL");
34 
35 
36 static int acpi_ac_add(struct acpi_device *device);
37 static int acpi_ac_remove(struct acpi_device *device);
38 static void acpi_ac_notify(struct acpi_device *device, u32 event);
39 
40 struct acpi_ac_bl {
41 	const char *hid;
42 	int hrv;
43 };
44 
45 static const struct acpi_device_id ac_device_ids[] = {
46 	{"ACPI0003", 0},
47 	{"", 0},
48 };
49 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
50 
51 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
52 static const struct acpi_ac_bl acpi_ac_blacklist[] = {
53 	{ "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
54 	{ "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
55 };
56 
57 #ifdef CONFIG_PM_SLEEP
58 static int acpi_ac_resume(struct device *dev);
59 #endif
60 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
61 
62 static int ac_sleep_before_get_state_ms;
63 static int ac_check_pmic = 1;
64 
65 static struct acpi_driver acpi_ac_driver = {
66 	.name = "ac",
67 	.class = ACPI_AC_CLASS,
68 	.ids = ac_device_ids,
69 	.flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
70 	.ops = {
71 		.add = acpi_ac_add,
72 		.remove = acpi_ac_remove,
73 		.notify = acpi_ac_notify,
74 		},
75 	.drv.pm = &acpi_ac_pm,
76 };
77 
78 struct acpi_ac {
79 	struct power_supply *charger;
80 	struct power_supply_desc charger_desc;
81 	struct acpi_device *device;
82 	unsigned long long state;
83 	struct notifier_block battery_nb;
84 };
85 
86 #define to_acpi_ac(x) power_supply_get_drvdata(x)
87 
88 /* AC Adapter Management */
89 static int acpi_ac_get_state(struct acpi_ac *ac)
90 {
91 	acpi_status status = AE_OK;
92 
93 	if (!ac)
94 		return -EINVAL;
95 
96 	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
97 				       &ac->state);
98 	if (ACPI_FAILURE(status)) {
99 		acpi_handle_info(ac->device->handle,
100 				"Error reading AC Adapter state: %s\n",
101 				acpi_format_exception(status));
102 		ac->state = ACPI_AC_STATUS_UNKNOWN;
103 		return -ENODEV;
104 	}
105 
106 	return 0;
107 }
108 
109 /* sysfs I/F */
110 static int get_ac_property(struct power_supply *psy,
111 			   enum power_supply_property psp,
112 			   union power_supply_propval *val)
113 {
114 	struct acpi_ac *ac = to_acpi_ac(psy);
115 
116 	if (!ac)
117 		return -ENODEV;
118 
119 	if (acpi_ac_get_state(ac))
120 		return -ENODEV;
121 
122 	switch (psp) {
123 	case POWER_SUPPLY_PROP_ONLINE:
124 		val->intval = ac->state;
125 		break;
126 	default:
127 		return -EINVAL;
128 	}
129 	return 0;
130 }
131 
132 static enum power_supply_property ac_props[] = {
133 	POWER_SUPPLY_PROP_ONLINE,
134 };
135 
136 /* Driver Model */
137 static void acpi_ac_notify(struct acpi_device *device, u32 event)
138 {
139 	struct acpi_ac *ac = acpi_driver_data(device);
140 
141 	if (!ac)
142 		return;
143 
144 	switch (event) {
145 	default:
146 		acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
147 				  event);
148 		fallthrough;
149 	case ACPI_AC_NOTIFY_STATUS:
150 	case ACPI_NOTIFY_BUS_CHECK:
151 	case ACPI_NOTIFY_DEVICE_CHECK:
152 		/*
153 		 * A buggy BIOS may notify AC first and then sleep for
154 		 * a specific time before doing actual operations in the
155 		 * EC event handler (_Qxx). This will cause the AC state
156 		 * reported by the ACPI event to be incorrect, so wait for a
157 		 * specific time for the EC event handler to make progress.
158 		 */
159 		if (ac_sleep_before_get_state_ms > 0)
160 			msleep(ac_sleep_before_get_state_ms);
161 
162 		acpi_ac_get_state(ac);
163 		acpi_bus_generate_netlink_event(device->pnp.device_class,
164 						  dev_name(&device->dev), event,
165 						  (u32) ac->state);
166 		acpi_notifier_call_chain(device, event, (u32) ac->state);
167 		kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
168 	}
169 }
170 
171 static int acpi_ac_battery_notify(struct notifier_block *nb,
172 				  unsigned long action, void *data)
173 {
174 	struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
175 	struct acpi_bus_event *event = (struct acpi_bus_event *)data;
176 
177 	/*
178 	 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
179 	 * when adapter is plugged/unplugged. However, battery status
180 	 * notifications are triggered when battery starts charging or
181 	 * discharging. Re-reading AC status triggers lost AC notifications,
182 	 * if AC status has changed.
183 	 */
184 	if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
185 	    event->type == ACPI_BATTERY_NOTIFY_STATUS)
186 		acpi_ac_get_state(ac);
187 
188 	return NOTIFY_OK;
189 }
190 
191 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
192 {
193 	ac_sleep_before_get_state_ms = 1000;
194 	return 0;
195 }
196 
197 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
198 {
199 	ac_check_pmic = 0;
200 	return 0;
201 }
202 
203 /* Please keep this list alphabetically sorted */
204 static const struct dmi_system_id ac_dmi_table[]  __initconst = {
205 	{
206 		/* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
207 		.callback = ac_do_not_check_pmic_quirk,
208 		.matches = {
209 			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
210 		},
211 	},
212 	{
213 		/* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
214 		.callback = ac_do_not_check_pmic_quirk,
215 		.matches = {
216 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
217 			DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
218 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
219 		},
220 	},
221 	{
222 		/* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
223 		.callback = thinkpad_e530_quirk,
224 		.matches = {
225 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
226 			DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
227 		},
228 	},
229 	{},
230 };
231 
232 static int acpi_ac_add(struct acpi_device *device)
233 {
234 	struct power_supply_config psy_cfg = {};
235 	int result = 0;
236 	struct acpi_ac *ac = NULL;
237 
238 
239 	if (!device)
240 		return -EINVAL;
241 
242 	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
243 	if (!ac)
244 		return -ENOMEM;
245 
246 	ac->device = device;
247 	strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
248 	strcpy(acpi_device_class(device), ACPI_AC_CLASS);
249 	device->driver_data = ac;
250 
251 	result = acpi_ac_get_state(ac);
252 	if (result)
253 		goto end;
254 
255 	psy_cfg.drv_data = ac;
256 
257 	ac->charger_desc.name = acpi_device_bid(device);
258 	ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
259 	ac->charger_desc.properties = ac_props;
260 	ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
261 	ac->charger_desc.get_property = get_ac_property;
262 	ac->charger = power_supply_register(&ac->device->dev,
263 					    &ac->charger_desc, &psy_cfg);
264 	if (IS_ERR(ac->charger)) {
265 		result = PTR_ERR(ac->charger);
266 		goto end;
267 	}
268 
269 	pr_info("%s [%s] (%s)\n", acpi_device_name(device),
270 		acpi_device_bid(device), ac->state ? "on-line" : "off-line");
271 
272 	ac->battery_nb.notifier_call = acpi_ac_battery_notify;
273 	register_acpi_notifier(&ac->battery_nb);
274 end:
275 	if (result)
276 		kfree(ac);
277 
278 	return result;
279 }
280 
281 #ifdef CONFIG_PM_SLEEP
282 static int acpi_ac_resume(struct device *dev)
283 {
284 	struct acpi_ac *ac;
285 	unsigned int old_state;
286 
287 	if (!dev)
288 		return -EINVAL;
289 
290 	ac = acpi_driver_data(to_acpi_device(dev));
291 	if (!ac)
292 		return -EINVAL;
293 
294 	old_state = ac->state;
295 	if (acpi_ac_get_state(ac))
296 		return 0;
297 	if (old_state != ac->state)
298 		kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
299 	return 0;
300 }
301 #else
302 #define acpi_ac_resume NULL
303 #endif
304 
305 static int acpi_ac_remove(struct acpi_device *device)
306 {
307 	struct acpi_ac *ac = NULL;
308 
309 
310 	if (!device || !acpi_driver_data(device))
311 		return -EINVAL;
312 
313 	ac = acpi_driver_data(device);
314 
315 	power_supply_unregister(ac->charger);
316 	unregister_acpi_notifier(&ac->battery_nb);
317 
318 	kfree(ac);
319 
320 	return 0;
321 }
322 
323 static int __init acpi_ac_init(void)
324 {
325 	unsigned int i;
326 	int result;
327 
328 	if (acpi_disabled)
329 		return -ENODEV;
330 
331 	dmi_check_system(ac_dmi_table);
332 
333 	if (ac_check_pmic) {
334 		for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
335 			if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
336 					     acpi_ac_blacklist[i].hrv)) {
337 				pr_info("found native %s PMIC, not loading\n",
338 					acpi_ac_blacklist[i].hid);
339 				return -ENODEV;
340 			}
341 	}
342 
343 	result = acpi_bus_register_driver(&acpi_ac_driver);
344 	if (result < 0)
345 		return -ENODEV;
346 
347 	return 0;
348 }
349 
350 static void __exit acpi_ac_exit(void)
351 {
352 	acpi_bus_unregister_driver(&acpi_ac_driver);
353 }
354 module_init(acpi_ac_init);
355 module_exit(acpi_ac_exit);
356