ac.c revision 97749cd9adbb2985e4b2aee1a59d6b970fe9c3a7 
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/init.h>
29#include <linux/types.h>
30#ifdef CONFIG_ACPI_PROCFS_POWER
31#include <linux/proc_fs.h>
32#include <linux/seq_file.h>
33#endif
34#ifdef CONFIG_ACPI_SYSFS_POWER
35#include <linux/power_supply.h>
36#endif
37#include <acpi/acpi_bus.h>
38#include <acpi/acpi_drivers.h>
39
40#define ACPI_AC_COMPONENT		0x00020000
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 int acpi_ac_resume(struct acpi_device *device);
65
66const static struct acpi_device_id ac_device_ids[] = {
67	{"ACPI0003", 0},
68	{"", 0},
69};
70MODULE_DEVICE_TABLE(acpi, ac_device_ids);
71
72static struct acpi_driver acpi_ac_driver = {
73	.name = "ac",
74	.class = ACPI_AC_CLASS,
75	.ids = ac_device_ids,
76	.ops = {
77		.add = acpi_ac_add,
78		.remove = acpi_ac_remove,
79		.resume = acpi_ac_resume,
80		},
81};
82
83struct acpi_ac {
84#ifdef CONFIG_ACPI_SYSFS_POWER
85	struct power_supply charger;
86#endif
87	struct acpi_device * device;
88	unsigned long state;
89};
90
91#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
92
93#ifdef CONFIG_ACPI_PROCFS_POWER
94static const struct file_operations acpi_ac_fops = {
95	.open = acpi_ac_open_fs,
96	.read = seq_read,
97	.llseek = seq_lseek,
98	.release = single_release,
99};
100#endif
101#ifdef CONFIG_ACPI_SYSFS_POWER
102static int get_ac_property(struct power_supply *psy,
103			   enum power_supply_property psp,
104			   union power_supply_propval *val)
105{
106	struct acpi_ac *ac = to_acpi_ac(psy);
107	switch (psp) {
108	case POWER_SUPPLY_PROP_ONLINE:
109		val->intval = ac->state;
110		break;
111	default:
112		return -EINVAL;
113	}
114	return 0;
115}
116
117static enum power_supply_property ac_props[] = {
118	POWER_SUPPLY_PROP_ONLINE,
119};
120#endif
121/* --------------------------------------------------------------------------
122                               AC Adapter Management
123   -------------------------------------------------------------------------- */
124
125static int acpi_ac_get_state(struct acpi_ac *ac)
126{
127	acpi_status status = AE_OK;
128
129
130	if (!ac)
131		return -EINVAL;
132
133	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
134	if (ACPI_FAILURE(status)) {
135		ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
136		ac->state = ACPI_AC_STATUS_UNKNOWN;
137		return -ENODEV;
138	}
139
140	return 0;
141}
142
143#ifdef CONFIG_ACPI_PROCFS_POWER
144/* --------------------------------------------------------------------------
145                              FS Interface (/proc)
146   -------------------------------------------------------------------------- */
147
148static struct proc_dir_entry *acpi_ac_dir;
149
150static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
151{
152	struct acpi_ac *ac = seq->private;
153
154
155	if (!ac)
156		return 0;
157
158	if (acpi_ac_get_state(ac)) {
159		seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
160		return 0;
161	}
162
163	seq_puts(seq, "state:                   ");
164	switch (ac->state) {
165	case ACPI_AC_STATUS_OFFLINE:
166		seq_puts(seq, "off-line\n");
167		break;
168	case ACPI_AC_STATUS_ONLINE:
169		seq_puts(seq, "on-line\n");
170		break;
171	default:
172		seq_puts(seq, "unknown\n");
173		break;
174	}
175
176	return 0;
177}
178
179static int acpi_ac_open_fs(struct inode *inode, struct file *file)
180{
181	return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
182}
183
184static int acpi_ac_add_fs(struct acpi_device *device)
185{
186	struct proc_dir_entry *entry = NULL;
187
188
189	if (!acpi_device_dir(device)) {
190		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
191						     acpi_ac_dir);
192		if (!acpi_device_dir(device))
193			return -ENODEV;
194		acpi_device_dir(device)->owner = THIS_MODULE;
195	}
196
197	/* 'state' [R] */
198	entry = create_proc_entry(ACPI_AC_FILE_STATE,
199				  S_IRUGO, acpi_device_dir(device));
200	if (!entry)
201		return -ENODEV;
202	else {
203		entry->proc_fops = &acpi_ac_fops;
204		entry->data = acpi_driver_data(device);
205		entry->owner = THIS_MODULE;
206	}
207
208	return 0;
209}
210
211static int acpi_ac_remove_fs(struct acpi_device *device)
212{
213
214	if (acpi_device_dir(device)) {
215		remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
216
217		remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
218		acpi_device_dir(device) = NULL;
219	}
220
221	return 0;
222}
223#endif
224
225/* --------------------------------------------------------------------------
226                                   Driver Model
227   -------------------------------------------------------------------------- */
228
229static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
230{
231	struct acpi_ac *ac = data;
232	struct acpi_device *device = NULL;
233
234
235	if (!ac)
236		return;
237
238	device = ac->device;
239	switch (event) {
240	case ACPI_AC_NOTIFY_STATUS:
241	case ACPI_NOTIFY_BUS_CHECK:
242	case ACPI_NOTIFY_DEVICE_CHECK:
243		acpi_ac_get_state(ac);
244		acpi_bus_generate_proc_event(device, event, (u32) ac->state);
245		acpi_bus_generate_netlink_event(device->pnp.device_class,
246						  device->dev.bus_id, event,
247						  (u32) ac->state);
248#ifdef CONFIG_ACPI_SYSFS_POWER
249		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
250#endif
251		break;
252	default:
253		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
254				  "Unsupported event [0x%x]\n", event));
255		break;
256	}
257
258	return;
259}
260
261static int acpi_ac_add(struct acpi_device *device)
262{
263	int result = 0;
264	acpi_status status = AE_OK;
265	struct acpi_ac *ac = NULL;
266
267
268	if (!device)
269		return -EINVAL;
270
271	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
272	if (!ac)
273		return -ENOMEM;
274
275	ac->device = device;
276	strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
277	strcpy(acpi_device_class(device), ACPI_AC_CLASS);
278	acpi_driver_data(device) = ac;
279
280	result = acpi_ac_get_state(ac);
281	if (result)
282		goto end;
283
284#ifdef CONFIG_ACPI_PROCFS_POWER
285	result = acpi_ac_add_fs(device);
286#endif
287	if (result)
288		goto end;
289#ifdef CONFIG_ACPI_SYSFS_POWER
290	ac->charger.name = acpi_device_bid(device);
291	ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
292	ac->charger.properties = ac_props;
293	ac->charger.num_properties = ARRAY_SIZE(ac_props);
294	ac->charger.get_property = get_ac_property;
295	power_supply_register(&ac->device->dev, &ac->charger);
296#endif
297	status = acpi_install_notify_handler(device->handle,
298					     ACPI_ALL_NOTIFY, acpi_ac_notify,
299					     ac);
300	if (ACPI_FAILURE(status)) {
301		result = -ENODEV;
302		goto end;
303	}
304
305	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
306	       acpi_device_name(device), acpi_device_bid(device),
307	       ac->state ? "on-line" : "off-line");
308
309      end:
310	if (result) {
311#ifdef CONFIG_ACPI_PROCFS_POWER
312		acpi_ac_remove_fs(device);
313#endif
314		kfree(ac);
315	}
316
317	return result;
318}
319
320static int acpi_ac_resume(struct acpi_device *device)
321{
322	struct acpi_ac *ac;
323	unsigned old_state;
324	if (!device || !acpi_driver_data(device))
325		return -EINVAL;
326	ac = acpi_driver_data(device);
327	old_state = ac->state;
328	if (acpi_ac_get_state(ac))
329		return 0;
330#ifdef CONFIG_ACPI_SYSFS_POWER
331	if (old_state != ac->state)
332		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
333#endif
334	return 0;
335}
336
337static int acpi_ac_remove(struct acpi_device *device, int type)
338{
339	acpi_status status = AE_OK;
340	struct acpi_ac *ac = NULL;
341
342
343	if (!device || !acpi_driver_data(device))
344		return -EINVAL;
345
346	ac = acpi_driver_data(device);
347
348	status = acpi_remove_notify_handler(device->handle,
349					    ACPI_ALL_NOTIFY, acpi_ac_notify);
350#ifdef CONFIG_ACPI_SYSFS_POWER
351	if (ac->charger.dev)
352		power_supply_unregister(&ac->charger);
353#endif
354#ifdef CONFIG_ACPI_PROCFS_POWER
355	acpi_ac_remove_fs(device);
356#endif
357
358	kfree(ac);
359
360	return 0;
361}
362
363static int __init acpi_ac_init(void)
364{
365	int result;
366
367	if (acpi_disabled)
368		return -ENODEV;
369
370#ifdef CONFIG_ACPI_PROCFS_POWER
371	acpi_ac_dir = acpi_lock_ac_dir();
372	if (!acpi_ac_dir)
373		return -ENODEV;
374#endif
375
376	result = acpi_bus_register_driver(&acpi_ac_driver);
377	if (result < 0) {
378#ifdef CONFIG_ACPI_PROCFS_POWER
379		acpi_unlock_ac_dir(acpi_ac_dir);
380#endif
381		return -ENODEV;
382	}
383
384	return 0;
385}
386
387static void __exit acpi_ac_exit(void)
388{
389
390	acpi_bus_unregister_driver(&acpi_ac_driver);
391
392#ifdef CONFIG_ACPI_PROCFS_POWER
393	acpi_unlock_ac_dir(acpi_ac_dir);
394#endif
395
396	return;
397}
398
399module_init(acpi_ac_init);
400module_exit(acpi_ac_exit);
401