ac.c 8.6 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
/*
 *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
30
#ifdef CONFIG_ACPI_PROCFS
L
Linus Torvalds 已提交
31 32
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
33
#endif
34
#include <linux/power_supply.h>
L
Linus Torvalds 已提交
35 36 37 38 39 40 41 42 43 44 45 46 47
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define ACPI_AC_COMPONENT		0x00020000
#define ACPI_AC_CLASS			"ac_adapter"
#define ACPI_AC_DEVICE_NAME		"AC Adapter"
#define ACPI_AC_FILE_STATE		"state"
#define ACPI_AC_NOTIFY_STATUS		0x80
#define ACPI_AC_STATUS_OFFLINE		0x00
#define ACPI_AC_STATUS_ONLINE		0x01
#define ACPI_AC_STATUS_UNKNOWN		0xFF

#define _COMPONENT		ACPI_AC_COMPONENT
48
ACPI_MODULE_NAME("ac");
L
Linus Torvalds 已提交
49

50
MODULE_AUTHOR("Paul Diefenbaugh");
51
MODULE_DESCRIPTION("ACPI AC Adapter Driver");
L
Linus Torvalds 已提交
52 53
MODULE_LICENSE("GPL");

54
#ifdef CONFIG_ACPI_PROCFS
55 56
extern struct proc_dir_entry *acpi_lock_ac_dir(void);
extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
57 58
static int acpi_ac_open_fs(struct inode *inode, struct file *file);
#endif
59

L
Len Brown 已提交
60 61
static int acpi_ac_add(struct acpi_device *device);
static int acpi_ac_remove(struct acpi_device *device, int type);
L
Linus Torvalds 已提交
62

63 64 65 66 67 68
const static struct acpi_device_id ac_device_ids[] = {
	{"ACPI0003", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, ac_device_ids);

L
Linus Torvalds 已提交
69
static struct acpi_driver acpi_ac_driver = {
L
Len Brown 已提交
70
	.name = "ac",
L
Len Brown 已提交
71
	.class = ACPI_AC_CLASS,
72
	.ids = ac_device_ids,
L
Len Brown 已提交
73 74 75 76
	.ops = {
		.add = acpi_ac_add,
		.remove = acpi_ac_remove,
		},
L
Linus Torvalds 已提交
77 78 79
};

struct acpi_ac {
80
	struct power_supply charger;
81
	struct acpi_device * device;
L
Len Brown 已提交
82
	unsigned long state;
L
Linus Torvalds 已提交
83 84
};

85 86
#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);

87
#ifdef CONFIG_ACPI_PROCFS
88
static const struct file_operations acpi_ac_fops = {
L
Len Brown 已提交
89 90 91 92
	.open = acpi_ac_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
L
Linus Torvalds 已提交
93
};
94 95
#endif

96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113
static int get_ac_property(struct power_supply *psy,
			   enum power_supply_property psp,
			   union power_supply_propval *val)
{
	struct acpi_ac *ac = to_acpi_ac(psy);
	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = ac->state;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static enum power_supply_property ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
};
L
Linus Torvalds 已提交
114 115 116 117 118

/* --------------------------------------------------------------------------
                               AC Adapter Management
   -------------------------------------------------------------------------- */

L
Len Brown 已提交
119
static int acpi_ac_get_state(struct acpi_ac *ac)
L
Linus Torvalds 已提交
120
{
L
Len Brown 已提交
121
	acpi_status status = AE_OK;
L
Linus Torvalds 已提交
122 123 124


	if (!ac)
125
		return -EINVAL;
L
Linus Torvalds 已提交
126

127
	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
L
Linus Torvalds 已提交
128
	if (ACPI_FAILURE(status)) {
129
		ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
L
Linus Torvalds 已提交
130
		ac->state = ACPI_AC_STATUS_UNKNOWN;
131
		return -ENODEV;
L
Linus Torvalds 已提交
132
	}
L
Len Brown 已提交
133

134
	return 0;
L
Linus Torvalds 已提交
135 136
}

137
#ifdef CONFIG_ACPI_PROCFS
L
Linus Torvalds 已提交
138 139 140 141
/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

L
Len Brown 已提交
142
static struct proc_dir_entry *acpi_ac_dir;
L
Linus Torvalds 已提交
143 144 145

static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
{
146
	struct acpi_ac *ac = seq->private;
L
Linus Torvalds 已提交
147 148 149


	if (!ac)
150
		return 0;
L
Linus Torvalds 已提交
151 152 153

	if (acpi_ac_get_state(ac)) {
		seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
154
		return 0;
L
Linus Torvalds 已提交
155 156 157 158 159 160 161 162 163 164 165 166 167 168 169
	}

	seq_puts(seq, "state:                   ");
	switch (ac->state) {
	case ACPI_AC_STATUS_OFFLINE:
		seq_puts(seq, "off-line\n");
		break;
	case ACPI_AC_STATUS_ONLINE:
		seq_puts(seq, "on-line\n");
		break;
	default:
		seq_puts(seq, "unknown\n");
		break;
	}

170
	return 0;
L
Linus Torvalds 已提交
171
}
L
Len Brown 已提交
172

L
Linus Torvalds 已提交
173 174 175 176 177
static int acpi_ac_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
}

L
Len Brown 已提交
178
static int acpi_ac_add_fs(struct acpi_device *device)
L
Linus Torvalds 已提交
179
{
L
Len Brown 已提交
180
	struct proc_dir_entry *entry = NULL;
L
Linus Torvalds 已提交
181 182 183 184


	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
L
Len Brown 已提交
185
						     acpi_ac_dir);
L
Linus Torvalds 已提交
186
		if (!acpi_device_dir(device))
187
			return -ENODEV;
L
Linus Torvalds 已提交
188 189 190 191 192
		acpi_device_dir(device)->owner = THIS_MODULE;
	}

	/* 'state' [R] */
	entry = create_proc_entry(ACPI_AC_FILE_STATE,
L
Len Brown 已提交
193
				  S_IRUGO, acpi_device_dir(device));
L
Linus Torvalds 已提交
194
	if (!entry)
195
		return -ENODEV;
L
Linus Torvalds 已提交
196 197 198 199 200 201
	else {
		entry->proc_fops = &acpi_ac_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

202
	return 0;
L
Linus Torvalds 已提交
203 204
}

L
Len Brown 已提交
205
static int acpi_ac_remove_fs(struct acpi_device *device)
L
Linus Torvalds 已提交
206 207 208
{

	if (acpi_device_dir(device)) {
L
Len Brown 已提交
209
		remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
L
Linus Torvalds 已提交
210 211 212 213 214

		remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
		acpi_device_dir(device) = NULL;
	}

215
	return 0;
L
Linus Torvalds 已提交
216
}
217
#endif
L
Linus Torvalds 已提交
218 219 220 221 222

/* --------------------------------------------------------------------------
                                   Driver Model
   -------------------------------------------------------------------------- */

L
Len Brown 已提交
223
static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
L
Linus Torvalds 已提交
224
{
225
	struct acpi_ac *ac = data;
L
Len Brown 已提交
226
	struct acpi_device *device = NULL;
L
Linus Torvalds 已提交
227 228 229


	if (!ac)
230
		return;
L
Linus Torvalds 已提交
231

232
	device = ac->device;
L
Linus Torvalds 已提交
233 234
	switch (event) {
	case ACPI_AC_NOTIFY_STATUS:
235 236
	case ACPI_NOTIFY_BUS_CHECK:
	case ACPI_NOTIFY_DEVICE_CHECK:
L
Linus Torvalds 已提交
237
		acpi_ac_get_state(ac);
238
		acpi_bus_generate_proc_event(device, event, (u32) ac->state);
239 240 241
		acpi_bus_generate_netlink_event(device->pnp.device_class,
						  device->dev.bus_id, event,
						  (u32) ac->state);
242
		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
L
Linus Torvalds 已提交
243 244 245
		break;
	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
L
Len Brown 已提交
246
				  "Unsupported event [0x%x]\n", event));
L
Linus Torvalds 已提交
247 248 249
		break;
	}

250
	return;
L
Linus Torvalds 已提交
251 252
}

L
Len Brown 已提交
253
static int acpi_ac_add(struct acpi_device *device)
L
Linus Torvalds 已提交
254
{
L
Len Brown 已提交
255 256 257
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_ac *ac = NULL;
L
Linus Torvalds 已提交
258 259 260


	if (!device)
261
		return -EINVAL;
L
Linus Torvalds 已提交
262

263
	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
L
Linus Torvalds 已提交
264
	if (!ac)
265
		return -ENOMEM;
L
Linus Torvalds 已提交
266

267
	ac->device = device;
L
Linus Torvalds 已提交
268 269 270 271 272 273 274 275
	strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_AC_CLASS);
	acpi_driver_data(device) = ac;

	result = acpi_ac_get_state(ac);
	if (result)
		goto end;

276
#ifdef CONFIG_ACPI_PROCFS
L
Linus Torvalds 已提交
277
	result = acpi_ac_add_fs(device);
278
#endif
L
Linus Torvalds 已提交
279 280
	if (result)
		goto end;
281 282 283 284 285 286
	ac->charger.name = acpi_device_bid(device);
	ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
	ac->charger.properties = ac_props;
	ac->charger.num_properties = ARRAY_SIZE(ac_props);
	ac->charger.get_property = get_ac_property;
	power_supply_register(&ac->device->dev, &ac->charger);
287
	status = acpi_install_notify_handler(device->handle,
288
					     ACPI_ALL_NOTIFY, acpi_ac_notify,
L
Len Brown 已提交
289
					     ac);
L
Linus Torvalds 已提交
290 291 292 293 294
	if (ACPI_FAILURE(status)) {
		result = -ENODEV;
		goto end;
	}

L
Len Brown 已提交
295 296 297
	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
	       acpi_device_name(device), acpi_device_bid(device),
	       ac->state ? "on-line" : "off-line");
L
Linus Torvalds 已提交
298

L
Len Brown 已提交
299
      end:
L
Linus Torvalds 已提交
300
	if (result) {
301
#ifdef CONFIG_ACPI_PROCFS
L
Linus Torvalds 已提交
302
		acpi_ac_remove_fs(device);
303
#endif
L
Linus Torvalds 已提交
304 305 306
		kfree(ac);
	}

307
	return result;
L
Linus Torvalds 已提交
308 309
}

L
Len Brown 已提交
310
static int acpi_ac_remove(struct acpi_device *device, int type)
L
Linus Torvalds 已提交
311
{
L
Len Brown 已提交
312 313
	acpi_status status = AE_OK;
	struct acpi_ac *ac = NULL;
L
Linus Torvalds 已提交
314 315 316


	if (!device || !acpi_driver_data(device))
317
		return -EINVAL;
L
Linus Torvalds 已提交
318

319
	ac = acpi_driver_data(device);
L
Linus Torvalds 已提交
320

321
	status = acpi_remove_notify_handler(device->handle,
322
					    ACPI_ALL_NOTIFY, acpi_ac_notify);
323 324
	if (ac->charger.dev)
		power_supply_unregister(&ac->charger);
325
#ifdef CONFIG_ACPI_PROCFS
L
Linus Torvalds 已提交
326
	acpi_ac_remove_fs(device);
327
#endif
L
Linus Torvalds 已提交
328 329 330

	kfree(ac);

331
	return 0;
L
Linus Torvalds 已提交
332 333
}

L
Len Brown 已提交
334
static int __init acpi_ac_init(void)
L
Linus Torvalds 已提交
335
{
336
	int result;
L
Linus Torvalds 已提交
337

P
Pavel Machek 已提交
338 339
	if (acpi_disabled)
		return -ENODEV;
L
Linus Torvalds 已提交
340

341
#ifdef CONFIG_ACPI_PROCFS
342
	acpi_ac_dir = acpi_lock_ac_dir();
L
Linus Torvalds 已提交
343
	if (!acpi_ac_dir)
344
		return -ENODEV;
345
#endif
L
Linus Torvalds 已提交
346 347 348

	result = acpi_bus_register_driver(&acpi_ac_driver);
	if (result < 0) {
349
#ifdef CONFIG_ACPI_PROCFS
350
		acpi_unlock_ac_dir(acpi_ac_dir);
351
#endif
352
		return -ENODEV;
L
Linus Torvalds 已提交
353 354
	}

355
	return 0;
L
Linus Torvalds 已提交
356 357
}

L
Len Brown 已提交
358
static void __exit acpi_ac_exit(void)
L
Linus Torvalds 已提交
359 360 361 362
{

	acpi_bus_unregister_driver(&acpi_ac_driver);

363
#ifdef CONFIG_ACPI_PROCFS
364
	acpi_unlock_ac_dir(acpi_ac_dir);
365
#endif
L
Linus Torvalds 已提交
366

367
	return;
L
Linus Torvalds 已提交
368 369 370 371
}

module_init(acpi_ac_init);
module_exit(acpi_ac_exit);