ac.c revision 9069240480e24a2d6ce23404c9ad6cabf59b7258 
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#ifdef CONFIG_ACPI_PROCFS_POWER
32#include <linux/proc_fs.h>
33#include <linux/seq_file.h>
34#endif
35#include <linux/power_supply.h>
36#include <acpi/acpi_bus.h>
37#include <acpi/acpi_drivers.h>
38
39#define PREFIX "ACPI: "
40
41#define ACPI_AC_CLASS			"ac_adapter"
42#define ACPI_AC_DEVICE_NAME		"AC Adapter"
43#define ACPI_AC_FILE_STATE		"state"
44#define ACPI_AC_NOTIFY_STATUS		0x80
45#define ACPI_AC_STATUS_OFFLINE		0x00
46#define ACPI_AC_STATUS_ONLINE		0x01
47#define ACPI_AC_STATUS_UNKNOWN		0xFF
48
49#define _COMPONENT		ACPI_AC_COMPONENT
50ACPI_MODULE_NAME("ac");
51
52MODULE_AUTHOR("Paul Diefenbaugh");
53MODULE_DESCRIPTION("ACPI AC Adapter Driver");
54MODULE_LICENSE("GPL");
55
56#ifdef CONFIG_ACPI_PROCFS_POWER
57extern struct proc_dir_entry *acpi_lock_ac_dir(void);
58extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
59static int acpi_ac_open_fs(struct inode *inode, struct file *file);
60#endif
61
62static int acpi_ac_add(struct acpi_device *device);
63static int acpi_ac_remove(struct acpi_device *device, int type);
64static void acpi_ac_notify(struct acpi_device *device, u32 event);
65
66static const struct acpi_device_id ac_device_ids[] = {
67	{"ACPI0003", 0},
68	{"", 0},
69};
70MODULE_DEVICE_TABLE(acpi, ac_device_ids);
71
72#ifdef CONFIG_PM_SLEEP
73static int acpi_ac_resume(struct device *dev);
74#endif
75static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
76
77static struct acpi_driver acpi_ac_driver = {
78	.name = "ac",
79	.class = ACPI_AC_CLASS,
80	.ids = ac_device_ids,
81	.flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
82	.ops = {
83		.add = acpi_ac_add,
84		.remove = acpi_ac_remove,
85		.notify = acpi_ac_notify,
86		},
87	.drv.pm = &acpi_ac_pm,
88};
89
90struct acpi_ac {
91	struct power_supply charger;
92	struct acpi_device * device;
93	unsigned long long state;
94};
95
96#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
97
98#ifdef CONFIG_ACPI_PROCFS_POWER
99static const struct file_operations acpi_ac_fops = {
100	.owner = THIS_MODULE,
101	.open = acpi_ac_open_fs,
102	.read = seq_read,
103	.llseek = seq_lseek,
104	.release = single_release,
105};
106#endif
107
108/* --------------------------------------------------------------------------
109                               AC Adapter Management
110   -------------------------------------------------------------------------- */
111
112static int acpi_ac_get_state(struct acpi_ac *ac)
113{
114	acpi_status status = AE_OK;
115
116
117	if (!ac)
118		return -EINVAL;
119
120	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
121	if (ACPI_FAILURE(status)) {
122		ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
123		ac->state = ACPI_AC_STATUS_UNKNOWN;
124		return -ENODEV;
125	}
126
127	return 0;
128}
129
130/* --------------------------------------------------------------------------
131                            sysfs I/F
132   -------------------------------------------------------------------------- */
133static int get_ac_property(struct power_supply *psy,
134			   enum power_supply_property psp,
135			   union power_supply_propval *val)
136{
137	struct acpi_ac *ac = to_acpi_ac(psy);
138
139	if (!ac)
140		return -ENODEV;
141
142	if (acpi_ac_get_state(ac))
143		return -ENODEV;
144
145	switch (psp) {
146	case POWER_SUPPLY_PROP_ONLINE:
147		val->intval = ac->state;
148		break;
149	default:
150		return -EINVAL;
151	}
152	return 0;
153}
154
155static enum power_supply_property ac_props[] = {
156	POWER_SUPPLY_PROP_ONLINE,
157};
158
159#ifdef CONFIG_ACPI_PROCFS_POWER
160/* --------------------------------------------------------------------------
161                              FS Interface (/proc)
162   -------------------------------------------------------------------------- */
163
164static struct proc_dir_entry *acpi_ac_dir;
165
166static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
167{
168	struct acpi_ac *ac = seq->private;
169
170
171	if (!ac)
172		return 0;
173
174	if (acpi_ac_get_state(ac)) {
175		seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
176		return 0;
177	}
178
179	seq_puts(seq, "state:                   ");
180	switch (ac->state) {
181	case ACPI_AC_STATUS_OFFLINE:
182		seq_puts(seq, "off-line\n");
183		break;
184	case ACPI_AC_STATUS_ONLINE:
185		seq_puts(seq, "on-line\n");
186		break;
187	default:
188		seq_puts(seq, "unknown\n");
189		break;
190	}
191
192	return 0;
193}
194
195static int acpi_ac_open_fs(struct inode *inode, struct file *file)
196{
197	return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
198}
199
200static int acpi_ac_add_fs(struct acpi_device *device)
201{
202	struct proc_dir_entry *entry = NULL;
203
204	printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
205			" please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
206	if (!acpi_device_dir(device)) {
207		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
208						     acpi_ac_dir);
209		if (!acpi_device_dir(device))
210			return -ENODEV;
211	}
212
213	/* 'state' [R] */
214	entry = proc_create_data(ACPI_AC_FILE_STATE,
215				 S_IRUGO, acpi_device_dir(device),
216				 &acpi_ac_fops, acpi_driver_data(device));
217	if (!entry)
218		return -ENODEV;
219	return 0;
220}
221
222static int acpi_ac_remove_fs(struct acpi_device *device)
223{
224
225	if (acpi_device_dir(device)) {
226		remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
227
228		remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
229		acpi_device_dir(device) = NULL;
230	}
231
232	return 0;
233}
234#endif
235
236/* --------------------------------------------------------------------------
237                                   Driver Model
238   -------------------------------------------------------------------------- */
239
240static void acpi_ac_notify(struct acpi_device *device, u32 event)
241{
242	struct acpi_ac *ac = acpi_driver_data(device);
243
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	case ACPI_AC_NOTIFY_STATUS:
253	case ACPI_NOTIFY_BUS_CHECK:
254	case ACPI_NOTIFY_DEVICE_CHECK:
255		acpi_ac_get_state(ac);
256		acpi_bus_generate_proc_event(device, event, (u32) ac->state);
257		acpi_bus_generate_netlink_event(device->pnp.device_class,
258						  dev_name(&device->dev), event,
259						  (u32) ac->state);
260		acpi_notifier_call_chain(device, event, (u32) ac->state);
261		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
262	}
263
264	return;
265}
266
267static int acpi_ac_add(struct acpi_device *device)
268{
269	int result = 0;
270	struct acpi_ac *ac = NULL;
271
272
273	if (!device)
274		return -EINVAL;
275
276	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
277	if (!ac)
278		return -ENOMEM;
279
280	ac->device = device;
281	strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
282	strcpy(acpi_device_class(device), ACPI_AC_CLASS);
283	device->driver_data = ac;
284
285	result = acpi_ac_get_state(ac);
286	if (result)
287		goto end;
288
289#ifdef CONFIG_ACPI_PROCFS_POWER
290	result = acpi_ac_add_fs(device);
291#endif
292	if (result)
293		goto end;
294	ac->charger.name = acpi_device_bid(device);
295	ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
296	ac->charger.properties = ac_props;
297	ac->charger.num_properties = ARRAY_SIZE(ac_props);
298	ac->charger.get_property = get_ac_property;
299	result = power_supply_register(&ac->device->dev, &ac->charger);
300	if (result)
301		goto end;
302
303	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
304	       acpi_device_name(device), acpi_device_bid(device),
305	       ac->state ? "on-line" : "off-line");
306
307      end:
308	if (result) {
309#ifdef CONFIG_ACPI_PROCFS_POWER
310		acpi_ac_remove_fs(device);
311#endif
312		kfree(ac);
313	}
314
315	return result;
316}
317
318#ifdef CONFIG_PM_SLEEP
319static int acpi_ac_resume(struct device *dev)
320{
321	struct acpi_ac *ac;
322	unsigned old_state;
323
324	if (!dev)
325		return -EINVAL;
326
327	ac = acpi_driver_data(to_acpi_device(dev));
328	if (!ac)
329		return -EINVAL;
330
331	old_state = ac->state;
332	if (acpi_ac_get_state(ac))
333		return 0;
334	if (old_state != ac->state)
335		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
336	return 0;
337}
338#endif
339
340static int acpi_ac_remove(struct acpi_device *device, int type)
341{
342	struct acpi_ac *ac = NULL;
343
344
345	if (!device || !acpi_driver_data(device))
346		return -EINVAL;
347
348	ac = acpi_driver_data(device);
349
350	if (ac->charger.dev)
351		power_supply_unregister(&ac->charger);
352#ifdef CONFIG_ACPI_PROCFS_POWER
353	acpi_ac_remove_fs(device);
354#endif
355
356	kfree(ac);
357
358	return 0;
359}
360
361static int __init acpi_ac_init(void)
362{
363	int result;
364
365	if (acpi_disabled)
366		return -ENODEV;
367
368#ifdef CONFIG_ACPI_PROCFS_POWER
369	acpi_ac_dir = acpi_lock_ac_dir();
370	if (!acpi_ac_dir)
371		return -ENODEV;
372#endif
373
374	result = acpi_bus_register_driver(&acpi_ac_driver);
375	if (result < 0) {
376#ifdef CONFIG_ACPI_PROCFS_POWER
377		acpi_unlock_ac_dir(acpi_ac_dir);
378#endif
379		return -ENODEV;
380	}
381
382	return 0;
383}
384
385static void __exit acpi_ac_exit(void)
386{
387
388	acpi_bus_unregister_driver(&acpi_ac_driver);
389
390#ifdef CONFIG_ACPI_PROCFS_POWER
391	acpi_unlock_ac_dir(acpi_ac_dir);
392#endif
393
394	return;
395}
396
397module_init(acpi_ac_init);
398module_exit(acpi_ac_exit);
399