ac.c revision 1696d9dc57e062ce5200f6a42a6aaada15b434bb 
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 *  You should have received a copy of the GNU General Public License along
20 *  with this program; if not, write to the Free Software Foundation, Inc.,
21 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/slab.h>
29#include <linux/init.h>
30#include <linux/types.h>
31#include <linux/dmi.h>
32#include <linux/delay.h>
33#ifdef CONFIG_ACPI_PROCFS_POWER
34#include <linux/proc_fs.h>
35#include <linux/seq_file.h>
36#endif
37#include <linux/power_supply.h>
38#include <acpi/acpi_bus.h>
39#include <acpi/acpi_drivers.h>
40
41#define PREFIX "ACPI: "
42
43#define ACPI_AC_CLASS			"ac_adapter"
44#define ACPI_AC_DEVICE_NAME		"AC Adapter"
45#define ACPI_AC_FILE_STATE		"state"
46#define ACPI_AC_NOTIFY_STATUS		0x80
47#define ACPI_AC_STATUS_OFFLINE		0x00
48#define ACPI_AC_STATUS_ONLINE		0x01
49#define ACPI_AC_STATUS_UNKNOWN		0xFF
50
51#define _COMPONENT		ACPI_AC_COMPONENT
52ACPI_MODULE_NAME("ac");
53
54MODULE_AUTHOR("Paul Diefenbaugh");
55MODULE_DESCRIPTION("ACPI AC Adapter Driver");
56MODULE_LICENSE("GPL");
57
58#ifdef CONFIG_ACPI_PROCFS_POWER
59extern struct proc_dir_entry *acpi_lock_ac_dir(void);
60extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
61static int acpi_ac_open_fs(struct inode *inode, struct file *file);
62#endif
63
64static int acpi_ac_add(struct acpi_device *device);
65static int acpi_ac_remove(struct acpi_device *device);
66static void acpi_ac_notify(struct acpi_device *device, u32 event);
67
68static const struct acpi_device_id ac_device_ids[] = {
69	{"ACPI0003", 0},
70	{"", 0},
71};
72MODULE_DEVICE_TABLE(acpi, ac_device_ids);
73
74#ifdef CONFIG_PM_SLEEP
75static int acpi_ac_resume(struct device *dev);
76#endif
77static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
78
79static int ac_sleep_before_get_state_ms;
80
81static struct acpi_driver acpi_ac_driver = {
82	.name = "ac",
83	.class = ACPI_AC_CLASS,
84	.ids = ac_device_ids,
85	.flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
86	.ops = {
87		.add = acpi_ac_add,
88		.remove = acpi_ac_remove,
89		.notify = acpi_ac_notify,
90		},
91	.drv.pm = &acpi_ac_pm,
92};
93
94struct acpi_ac {
95	struct power_supply charger;
96	struct acpi_device * device;
97	unsigned long long state;
98};
99
100#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
101
102#ifdef CONFIG_ACPI_PROCFS_POWER
103static const struct file_operations acpi_ac_fops = {
104	.owner = THIS_MODULE,
105	.open = acpi_ac_open_fs,
106	.read = seq_read,
107	.llseek = seq_lseek,
108	.release = single_release,
109};
110#endif
111
112/* --------------------------------------------------------------------------
113                               AC Adapter Management
114   -------------------------------------------------------------------------- */
115
116static int acpi_ac_get_state(struct acpi_ac *ac)
117{
118	acpi_status status = AE_OK;
119
120
121	if (!ac)
122		return -EINVAL;
123
124	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
125	if (ACPI_FAILURE(status)) {
126		ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
127		ac->state = ACPI_AC_STATUS_UNKNOWN;
128		return -ENODEV;
129	}
130
131	return 0;
132}
133
134/* --------------------------------------------------------------------------
135                            sysfs I/F
136   -------------------------------------------------------------------------- */
137static int get_ac_property(struct power_supply *psy,
138			   enum power_supply_property psp,
139			   union power_supply_propval *val)
140{
141	struct acpi_ac *ac = to_acpi_ac(psy);
142
143	if (!ac)
144		return -ENODEV;
145
146	if (acpi_ac_get_state(ac))
147		return -ENODEV;
148
149	switch (psp) {
150	case POWER_SUPPLY_PROP_ONLINE:
151		val->intval = ac->state;
152		break;
153	default:
154		return -EINVAL;
155	}
156	return 0;
157}
158
159static enum power_supply_property ac_props[] = {
160	POWER_SUPPLY_PROP_ONLINE,
161};
162
163#ifdef CONFIG_ACPI_PROCFS_POWER
164/* --------------------------------------------------------------------------
165                              FS Interface (/proc)
166   -------------------------------------------------------------------------- */
167
168static struct proc_dir_entry *acpi_ac_dir;
169
170static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
171{
172	struct acpi_ac *ac = seq->private;
173
174
175	if (!ac)
176		return 0;
177
178	if (acpi_ac_get_state(ac)) {
179		seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
180		return 0;
181	}
182
183	seq_puts(seq, "state:                   ");
184	switch (ac->state) {
185	case ACPI_AC_STATUS_OFFLINE:
186		seq_puts(seq, "off-line\n");
187		break;
188	case ACPI_AC_STATUS_ONLINE:
189		seq_puts(seq, "on-line\n");
190		break;
191	default:
192		seq_puts(seq, "unknown\n");
193		break;
194	}
195
196	return 0;
197}
198
199static int acpi_ac_open_fs(struct inode *inode, struct file *file)
200{
201	return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
202}
203
204static int acpi_ac_add_fs(struct acpi_device *device)
205{
206	struct proc_dir_entry *entry = NULL;
207
208	printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
209			" please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
210	if (!acpi_device_dir(device)) {
211		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
212						     acpi_ac_dir);
213		if (!acpi_device_dir(device))
214			return -ENODEV;
215	}
216
217	/* 'state' [R] */
218	entry = proc_create_data(ACPI_AC_FILE_STATE,
219				 S_IRUGO, acpi_device_dir(device),
220				 &acpi_ac_fops, acpi_driver_data(device));
221	if (!entry)
222		return -ENODEV;
223	return 0;
224}
225
226static int acpi_ac_remove_fs(struct acpi_device *device)
227{
228
229	if (acpi_device_dir(device)) {
230		remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
231
232		remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
233		acpi_device_dir(device) = NULL;
234	}
235
236	return 0;
237}
238#endif
239
240/* --------------------------------------------------------------------------
241                                   Driver Model
242   -------------------------------------------------------------------------- */
243
244static void acpi_ac_notify(struct acpi_device *device, u32 event)
245{
246	struct acpi_ac *ac = acpi_driver_data(device);
247
248
249	if (!ac)
250		return;
251
252	switch (event) {
253	default:
254		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
255				  "Unsupported event [0x%x]\n", event));
256	case ACPI_AC_NOTIFY_STATUS:
257	case ACPI_NOTIFY_BUS_CHECK:
258	case ACPI_NOTIFY_DEVICE_CHECK:
259		/*
260		 * A buggy BIOS may notify AC first and then sleep for
261		 * a specific time before doing actual operations in the
262		 * EC event handler (_Qxx). This will cause the AC state
263		 * reported by the ACPI event to be incorrect, so wait for a
264		 * specific time for the EC event handler to make progress.
265		 */
266		if (ac_sleep_before_get_state_ms > 0)
267			msleep(ac_sleep_before_get_state_ms);
268
269		acpi_ac_get_state(ac);
270		acpi_bus_generate_netlink_event(device->pnp.device_class,
271						  dev_name(&device->dev), event,
272						  (u32) ac->state);
273		acpi_notifier_call_chain(device, event, (u32) ac->state);
274		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
275	}
276
277	return;
278}
279
280static int thinkpad_e530_quirk(const struct dmi_system_id *d)
281{
282	ac_sleep_before_get_state_ms = 1000;
283	return 0;
284}
285
286static struct dmi_system_id ac_dmi_table[] = {
287	{
288	.callback = thinkpad_e530_quirk,
289	.ident = "thinkpad e530",
290	.matches = {
291		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
292		DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
293		},
294	},
295	{},
296};
297
298static int acpi_ac_add(struct acpi_device *device)
299{
300	int result = 0;
301	struct acpi_ac *ac = NULL;
302
303
304	if (!device)
305		return -EINVAL;
306
307	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
308	if (!ac)
309		return -ENOMEM;
310
311	ac->device = device;
312	strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
313	strcpy(acpi_device_class(device), ACPI_AC_CLASS);
314	device->driver_data = ac;
315
316	result = acpi_ac_get_state(ac);
317	if (result)
318		goto end;
319
320#ifdef CONFIG_ACPI_PROCFS_POWER
321	result = acpi_ac_add_fs(device);
322#endif
323	if (result)
324		goto end;
325	ac->charger.name = acpi_device_bid(device);
326	ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
327	ac->charger.properties = ac_props;
328	ac->charger.num_properties = ARRAY_SIZE(ac_props);
329	ac->charger.get_property = get_ac_property;
330	result = power_supply_register(&ac->device->dev, &ac->charger);
331	if (result)
332		goto end;
333
334	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
335	       acpi_device_name(device), acpi_device_bid(device),
336	       ac->state ? "on-line" : "off-line");
337
338      end:
339	if (result) {
340#ifdef CONFIG_ACPI_PROCFS_POWER
341		acpi_ac_remove_fs(device);
342#endif
343		kfree(ac);
344	}
345
346	dmi_check_system(ac_dmi_table);
347	return result;
348}
349
350#ifdef CONFIG_PM_SLEEP
351static int acpi_ac_resume(struct device *dev)
352{
353	struct acpi_ac *ac;
354	unsigned old_state;
355
356	if (!dev)
357		return -EINVAL;
358
359	ac = acpi_driver_data(to_acpi_device(dev));
360	if (!ac)
361		return -EINVAL;
362
363	old_state = ac->state;
364	if (acpi_ac_get_state(ac))
365		return 0;
366	if (old_state != ac->state)
367		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
368	return 0;
369}
370#endif
371
372static int acpi_ac_remove(struct acpi_device *device)
373{
374	struct acpi_ac *ac = NULL;
375
376
377	if (!device || !acpi_driver_data(device))
378		return -EINVAL;
379
380	ac = acpi_driver_data(device);
381
382	if (ac->charger.dev)
383		power_supply_unregister(&ac->charger);
384#ifdef CONFIG_ACPI_PROCFS_POWER
385	acpi_ac_remove_fs(device);
386#endif
387
388	kfree(ac);
389
390	return 0;
391}
392
393static int __init acpi_ac_init(void)
394{
395	int result;
396
397	if (acpi_disabled)
398		return -ENODEV;
399
400#ifdef CONFIG_ACPI_PROCFS_POWER
401	acpi_ac_dir = acpi_lock_ac_dir();
402	if (!acpi_ac_dir)
403		return -ENODEV;
404#endif
405
406	result = acpi_bus_register_driver(&acpi_ac_driver);
407	if (result < 0) {
408#ifdef CONFIG_ACPI_PROCFS_POWER
409		acpi_unlock_ac_dir(acpi_ac_dir);
410#endif
411		return -ENODEV;
412	}
413
414	return 0;
415}
416
417static void __exit acpi_ac_exit(void)
418{
419
420	acpi_bus_unregister_driver(&acpi_ac_driver);
421
422#ifdef CONFIG_ACPI_PROCFS_POWER
423	acpi_unlock_ac_dir(acpi_ac_dir);
424#endif
425
426	return;
427}
428
429module_init(acpi_ac_init);
430module_exit(acpi_ac_exit);
431