xref: /linux/drivers/acpi/ac.c (revision f79e4d5f92a129a1159c973735007d4ddc8541f3) 
1 /*
2  *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20  */
21 
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/init.h>
26 #include <linux/types.h>
27 #include <linux/dmi.h>
28 #include <linux/delay.h>
29 #ifdef CONFIG_ACPI_PROCFS_POWER
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #endif
33 #include <linux/platform_device.h>
34 #include <linux/power_supply.h>
35 #include <linux/acpi.h>
36 #include <acpi/battery.h>
37 
38 #define PREFIX "ACPI: "
39 
40 #define ACPI_AC_CLASS			"ac_adapter"
41 #define ACPI_AC_DEVICE_NAME		"AC Adapter"
42 #define ACPI_AC_FILE_STATE		"state"
43 #define ACPI_AC_NOTIFY_STATUS		0x80
44 #define ACPI_AC_STATUS_OFFLINE		0x00
45 #define ACPI_AC_STATUS_ONLINE		0x01
46 #define ACPI_AC_STATUS_UNKNOWN		0xFF
47 
48 #define _COMPONENT		ACPI_AC_COMPONENT
49 ACPI_MODULE_NAME("ac");
50 
51 MODULE_AUTHOR("Paul Diefenbaugh");
52 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
53 MODULE_LICENSE("GPL");
54 
55 
56 static int acpi_ac_add(struct acpi_device *device);
57 static int acpi_ac_remove(struct acpi_device *device);
58 static void acpi_ac_notify(struct acpi_device *device, u32 event);
59 
60 struct acpi_ac_bl {
61 	const char *hid;
62 	int hrv;
63 };
64 
65 static const struct acpi_device_id ac_device_ids[] = {
66 	{"ACPI0003", 0},
67 	{"", 0},
68 };
69 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
70 
71 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
72 static const struct acpi_ac_bl acpi_ac_blacklist[] = {
73 	{ "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
74 	{ "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
75 };
76 
77 #ifdef CONFIG_PM_SLEEP
78 static int acpi_ac_resume(struct device *dev);
79 #endif
80 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
81 
82 #ifdef CONFIG_ACPI_PROCFS_POWER
83 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
84 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
85 #endif
86 
87 
88 static int ac_sleep_before_get_state_ms;
89 static int ac_check_pmic = 1;
90 
91 static struct acpi_driver acpi_ac_driver = {
92 	.name = "ac",
93 	.class = ACPI_AC_CLASS,
94 	.ids = ac_device_ids,
95 	.flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
96 	.ops = {
97 		.add = acpi_ac_add,
98 		.remove = acpi_ac_remove,
99 		.notify = acpi_ac_notify,
100 		},
101 	.drv.pm = &acpi_ac_pm,
102 };
103 
104 struct acpi_ac {
105 	struct power_supply *charger;
106 	struct power_supply_desc charger_desc;
107 	struct acpi_device * device;
108 	unsigned long long state;
109 	struct notifier_block battery_nb;
110 };
111 
112 #define to_acpi_ac(x) power_supply_get_drvdata(x)
113 
114 /* --------------------------------------------------------------------------
115                                AC Adapter Management
116    -------------------------------------------------------------------------- */
117 
118 static int acpi_ac_get_state(struct acpi_ac *ac)
119 {
120 	acpi_status status = AE_OK;
121 
122 	if (!ac)
123 		return -EINVAL;
124 
125 	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
126 				       &ac->state);
127 	if (ACPI_FAILURE(status)) {
128 		ACPI_EXCEPTION((AE_INFO, status,
129 				"Error reading AC Adapter state"));
130 		ac->state = ACPI_AC_STATUS_UNKNOWN;
131 		return -ENODEV;
132 	}
133 
134 	return 0;
135 }
136 
137 /* --------------------------------------------------------------------------
138                             sysfs I/F
139    -------------------------------------------------------------------------- */
140 static int get_ac_property(struct power_supply *psy,
141 			   enum power_supply_property psp,
142 			   union power_supply_propval *val)
143 {
144 	struct acpi_ac *ac = to_acpi_ac(psy);
145 
146 	if (!ac)
147 		return -ENODEV;
148 
149 	if (acpi_ac_get_state(ac))
150 		return -ENODEV;
151 
152 	switch (psp) {
153 	case POWER_SUPPLY_PROP_ONLINE:
154 		val->intval = ac->state;
155 		break;
156 	default:
157 		return -EINVAL;
158 	}
159 	return 0;
160 }
161 
162 static enum power_supply_property ac_props[] = {
163 	POWER_SUPPLY_PROP_ONLINE,
164 };
165 
166 #ifdef CONFIG_ACPI_PROCFS_POWER
167 /* --------------------------------------------------------------------------
168                               FS Interface (/proc)
169    -------------------------------------------------------------------------- */
170 
171 static struct proc_dir_entry *acpi_ac_dir;
172 
173 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
174 {
175 	struct acpi_ac *ac = seq->private;
176 
177 
178 	if (!ac)
179 		return 0;
180 
181 	if (acpi_ac_get_state(ac)) {
182 		seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
183 		return 0;
184 	}
185 
186 	seq_puts(seq, "state:                   ");
187 	switch (ac->state) {
188 	case ACPI_AC_STATUS_OFFLINE:
189 		seq_puts(seq, "off-line\n");
190 		break;
191 	case ACPI_AC_STATUS_ONLINE:
192 		seq_puts(seq, "on-line\n");
193 		break;
194 	default:
195 		seq_puts(seq, "unknown\n");
196 		break;
197 	}
198 
199 	return 0;
200 }
201 
202 static int acpi_ac_add_fs(struct acpi_ac *ac)
203 {
204 	struct proc_dir_entry *entry = NULL;
205 
206 	printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
207 			" please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
208 	if (!acpi_device_dir(ac->device)) {
209 		acpi_device_dir(ac->device) =
210 			proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir);
211 		if (!acpi_device_dir(ac->device))
212 			return -ENODEV;
213 	}
214 
215 	/* 'state' [R] */
216 	entry = proc_create_single_data(ACPI_AC_FILE_STATE, S_IRUGO,
217 			acpi_device_dir(ac->device), acpi_ac_seq_show, ac);
218 	if (!entry)
219 		return -ENODEV;
220 	return 0;
221 }
222 
223 static int acpi_ac_remove_fs(struct acpi_ac *ac)
224 {
225 
226 	if (acpi_device_dir(ac->device)) {
227 		remove_proc_entry(ACPI_AC_FILE_STATE,
228 				  acpi_device_dir(ac->device));
229 		remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir);
230 		acpi_device_dir(ac->device) = NULL;
231 	}
232 
233 	return 0;
234 }
235 #endif
236 
237 /* --------------------------------------------------------------------------
238                                    Driver Model
239    -------------------------------------------------------------------------- */
240 
241 static void acpi_ac_notify(struct acpi_device *device, u32 event)
242 {
243 	struct acpi_ac *ac = acpi_driver_data(device);
244 
245 	if (!ac)
246 		return;
247 
248 	switch (event) {
249 	default:
250 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
251 				  "Unsupported event [0x%x]\n", event));
252 	/* fall through */
253 	case ACPI_AC_NOTIFY_STATUS:
254 	case ACPI_NOTIFY_BUS_CHECK:
255 	case ACPI_NOTIFY_DEVICE_CHECK:
256 		/*
257 		 * A buggy BIOS may notify AC first and then sleep for
258 		 * a specific time before doing actual operations in the
259 		 * EC event handler (_Qxx). This will cause the AC state
260 		 * reported by the ACPI event to be incorrect, so wait for a
261 		 * specific time for the EC event handler to make progress.
262 		 */
263 		if (ac_sleep_before_get_state_ms > 0)
264 			msleep(ac_sleep_before_get_state_ms);
265 
266 		acpi_ac_get_state(ac);
267 		acpi_bus_generate_netlink_event(device->pnp.device_class,
268 						  dev_name(&device->dev), event,
269 						  (u32) ac->state);
270 		acpi_notifier_call_chain(device, event, (u32) ac->state);
271 		kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
272 	}
273 
274 	return;
275 }
276 
277 static int acpi_ac_battery_notify(struct notifier_block *nb,
278 				  unsigned long action, void *data)
279 {
280 	struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
281 	struct acpi_bus_event *event = (struct acpi_bus_event *)data;
282 
283 	/*
284 	 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
285 	 * when adapter is plugged/unplugged. However, battery status
286 	 * notifcations are triggered when battery starts charging or
287 	 * discharging. Re-reading AC status triggers lost AC notifications,
288 	 * if AC status has changed.
289 	 */
290 	if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
291 	    event->type == ACPI_BATTERY_NOTIFY_STATUS)
292 		acpi_ac_get_state(ac);
293 
294 	return NOTIFY_OK;
295 }
296 
297 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
298 {
299 	ac_sleep_before_get_state_ms = 1000;
300 	return 0;
301 }
302 
303 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
304 {
305 	ac_check_pmic = 0;
306 	return 0;
307 }
308 
309 static const struct dmi_system_id ac_dmi_table[]  __initconst = {
310 	{
311 	/* Thinkpad e530 */
312 	.callback = thinkpad_e530_quirk,
313 	.matches = {
314 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
315 		DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
316 		},
317 	},
318 	{
319 		/* ECS EF20EA */
320 		.callback = ac_do_not_check_pmic_quirk,
321 		.matches = {
322 			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
323 		},
324 	},
325 	{
326 		/* Lenovo Ideapad Miix 320 */
327 		.callback = ac_do_not_check_pmic_quirk,
328 		.matches = {
329 		  DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
330 		  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "80XF"),
331 		  DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
332 		},
333 	},
334 	{},
335 };
336 
337 static int acpi_ac_add(struct acpi_device *device)
338 {
339 	struct power_supply_config psy_cfg = {};
340 	int result = 0;
341 	struct acpi_ac *ac = NULL;
342 
343 
344 	if (!device)
345 		return -EINVAL;
346 
347 	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
348 	if (!ac)
349 		return -ENOMEM;
350 
351 	ac->device = device;
352 	strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
353 	strcpy(acpi_device_class(device), ACPI_AC_CLASS);
354 	device->driver_data = ac;
355 
356 	result = acpi_ac_get_state(ac);
357 	if (result)
358 		goto end;
359 
360 	psy_cfg.drv_data = ac;
361 
362 	ac->charger_desc.name = acpi_device_bid(device);
363 #ifdef CONFIG_ACPI_PROCFS_POWER
364 	result = acpi_ac_add_fs(ac);
365 	if (result)
366 		goto end;
367 #endif
368 	ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
369 	ac->charger_desc.properties = ac_props;
370 	ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
371 	ac->charger_desc.get_property = get_ac_property;
372 	ac->charger = power_supply_register(&ac->device->dev,
373 					    &ac->charger_desc, &psy_cfg);
374 	if (IS_ERR(ac->charger)) {
375 		result = PTR_ERR(ac->charger);
376 		goto end;
377 	}
378 
379 	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
380 	       acpi_device_name(device), acpi_device_bid(device),
381 	       ac->state ? "on-line" : "off-line");
382 
383 	ac->battery_nb.notifier_call = acpi_ac_battery_notify;
384 	register_acpi_notifier(&ac->battery_nb);
385 end:
386 	if (result) {
387 #ifdef CONFIG_ACPI_PROCFS_POWER
388 		acpi_ac_remove_fs(ac);
389 #endif
390 		kfree(ac);
391 	}
392 
393 	return result;
394 }
395 
396 #ifdef CONFIG_PM_SLEEP
397 static int acpi_ac_resume(struct device *dev)
398 {
399 	struct acpi_ac *ac;
400 	unsigned old_state;
401 
402 	if (!dev)
403 		return -EINVAL;
404 
405 	ac = acpi_driver_data(to_acpi_device(dev));
406 	if (!ac)
407 		return -EINVAL;
408 
409 	old_state = ac->state;
410 	if (acpi_ac_get_state(ac))
411 		return 0;
412 	if (old_state != ac->state)
413 		kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
414 	return 0;
415 }
416 #else
417 #define acpi_ac_resume NULL
418 #endif
419 
420 static int acpi_ac_remove(struct acpi_device *device)
421 {
422 	struct acpi_ac *ac = NULL;
423 
424 
425 	if (!device || !acpi_driver_data(device))
426 		return -EINVAL;
427 
428 	ac = acpi_driver_data(device);
429 
430 	power_supply_unregister(ac->charger);
431 	unregister_acpi_notifier(&ac->battery_nb);
432 
433 #ifdef CONFIG_ACPI_PROCFS_POWER
434 	acpi_ac_remove_fs(ac);
435 #endif
436 
437 	kfree(ac);
438 
439 	return 0;
440 }
441 
442 static int __init acpi_ac_init(void)
443 {
444 	unsigned int i;
445 	int result;
446 
447 	if (acpi_disabled)
448 		return -ENODEV;
449 
450 	dmi_check_system(ac_dmi_table);
451 
452 	if (ac_check_pmic) {
453 		for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
454 			if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
455 					     acpi_ac_blacklist[i].hrv)) {
456 				pr_info(PREFIX "AC: found native %s PMIC, not loading\n",
457 					acpi_ac_blacklist[i].hid);
458 				return -ENODEV;
459 			}
460 	}
461 
462 #ifdef CONFIG_ACPI_PROCFS_POWER
463 	acpi_ac_dir = acpi_lock_ac_dir();
464 	if (!acpi_ac_dir)
465 		return -ENODEV;
466 #endif
467 
468 
469 	result = acpi_bus_register_driver(&acpi_ac_driver);
470 	if (result < 0) {
471 #ifdef CONFIG_ACPI_PROCFS_POWER
472 		acpi_unlock_ac_dir(acpi_ac_dir);
473 #endif
474 		return -ENODEV;
475 	}
476 
477 	return 0;
478 }
479 
480 static void __exit acpi_ac_exit(void)
481 {
482 	acpi_bus_unregister_driver(&acpi_ac_driver);
483 #ifdef CONFIG_ACPI_PROCFS_POWER
484 	acpi_unlock_ac_dir(acpi_ac_dir);
485 #endif
486 }
487 module_init(acpi_ac_init);
488 module_exit(acpi_ac_exit);
489