/drivers/acpi/ac.c

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