ac.c 10.2 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
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
/*
 *  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>
28
#include <linux/slab.h>
Linus Torvalds's avatar
Linus Torvalds committed
29 30
#include <linux/init.h>
#include <linux/types.h>
31 32
#include <linux/dmi.h>
#include <linux/delay.h>
33
#ifdef CONFIG_ACPI_PROCFS_POWER
Linus Torvalds's avatar
Linus Torvalds committed
34 35
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
36
#endif
37
#include <linux/power_supply.h>
Linus Torvalds's avatar
Linus Torvalds committed
38 39 40
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

41 42
#define PREFIX "ACPI: "

Linus Torvalds's avatar
Linus Torvalds committed
43 44 45 46 47 48 49 50 51
#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
52
ACPI_MODULE_NAME("ac");
Linus Torvalds's avatar
Linus Torvalds committed
53

54
MODULE_AUTHOR("Paul Diefenbaugh");
55
MODULE_DESCRIPTION("ACPI AC Adapter Driver");
Linus Torvalds's avatar
Linus Torvalds committed
56 57
MODULE_LICENSE("GPL");

58
#ifdef CONFIG_ACPI_PROCFS_POWER
59 60
extern struct proc_dir_entry *acpi_lock_ac_dir(void);
extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
61 62
static int acpi_ac_open_fs(struct inode *inode, struct file *file);
#endif
63

64
static int acpi_ac_add(struct acpi_device *device);
65
static int acpi_ac_remove(struct acpi_device *device);
66
static void acpi_ac_notify(struct acpi_device *device, u32 event);
Linus Torvalds's avatar
Linus Torvalds committed
67

68
static const struct acpi_device_id ac_device_ids[] = {
69 70 71 72 73
	{"ACPI0003", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, ac_device_ids);

74
#ifdef CONFIG_PM_SLEEP
75
static int acpi_ac_resume(struct device *dev);
76
#endif
77 78
static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);

79 80
static int ac_sleep_before_get_state_ms;

Linus Torvalds's avatar
Linus Torvalds committed
81
static 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 87 88
	.ops = {
		.add = acpi_ac_add,
		.remove = acpi_ac_remove,
89
		.notify = acpi_ac_notify,
90
		},
91
	.drv.pm = &acpi_ac_pm,
Linus Torvalds's avatar
Linus Torvalds committed
92 93 94
};

struct acpi_ac {
95
	struct power_supply charger;
96
	struct acpi_device * device;
97
	unsigned long long state;
Linus Torvalds's avatar
Linus Torvalds committed
98 99
};

100
#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
101

102
#ifdef CONFIG_ACPI_PROCFS_POWER
103
static const struct file_operations acpi_ac_fops = {
104
	.owner = THIS_MODULE,
105 106 107 108
	.open = acpi_ac_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
Linus Torvalds's avatar
Linus Torvalds committed
109
};
110
#endif
111

Linus Torvalds's avatar
Linus Torvalds committed
112 113 114 115
/* --------------------------------------------------------------------------
                               AC Adapter Management
   -------------------------------------------------------------------------- */

116
static int acpi_ac_get_state(struct acpi_ac *ac)
Linus Torvalds's avatar
Linus Torvalds committed
117
{
118
	acpi_status status = AE_OK;
Linus Torvalds's avatar
Linus Torvalds committed
119 120 121


	if (!ac)
122
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
123

124
	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
Linus Torvalds's avatar
Linus Torvalds committed
125
	if (ACPI_FAILURE(status)) {
126
		ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
Linus Torvalds's avatar
Linus Torvalds committed
127
		ac->state = ACPI_AC_STATUS_UNKNOWN;
128
		return -ENODEV;
Linus Torvalds's avatar
Linus Torvalds committed
129
	}
130

131
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
132 133
}

134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162
/* --------------------------------------------------------------------------
                            sysfs I/F
   -------------------------------------------------------------------------- */
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);

	if (!ac)
		return -ENODEV;

	if (acpi_ac_get_state(ac))
		return -ENODEV;

	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,
};

163
#ifdef CONFIG_ACPI_PROCFS_POWER
Linus Torvalds's avatar
Linus Torvalds committed
164 165 166 167
/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

168
static struct proc_dir_entry *acpi_ac_dir;
Linus Torvalds's avatar
Linus Torvalds committed
169 170 171

static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
{
172
	struct acpi_ac *ac = seq->private;
Linus Torvalds's avatar
Linus Torvalds committed
173 174 175


	if (!ac)
176
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
177 178 179

	if (acpi_ac_get_state(ac)) {
		seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
180
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195
	}

	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;
	}

196
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
197
}
198

Linus Torvalds's avatar
Linus Torvalds committed
199 200
static int acpi_ac_open_fs(struct inode *inode, struct file *file)
{
201
	return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
Linus Torvalds's avatar
Linus Torvalds committed
202 203
}

204
static int acpi_ac_add_fs(struct acpi_device *device)
Linus Torvalds's avatar
Linus Torvalds committed
205
{
206
	struct proc_dir_entry *entry = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
207

208 209
	printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
			" please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
Linus Torvalds's avatar
Linus Torvalds committed
210 211
	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
212
						     acpi_ac_dir);
Linus Torvalds's avatar
Linus Torvalds committed
213
		if (!acpi_device_dir(device))
214
			return -ENODEV;
Linus Torvalds's avatar
Linus Torvalds committed
215 216 217
	}

	/* 'state' [R] */
218 219 220
	entry = proc_create_data(ACPI_AC_FILE_STATE,
				 S_IRUGO, acpi_device_dir(device),
				 &acpi_ac_fops, acpi_driver_data(device));
Linus Torvalds's avatar
Linus Torvalds committed
221
	if (!entry)
222 223
		return -ENODEV;
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
224 225
}

226
static int acpi_ac_remove_fs(struct acpi_device *device)
Linus Torvalds's avatar
Linus Torvalds committed
227 228 229
{

	if (acpi_device_dir(device)) {
230
		remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
Linus Torvalds's avatar
Linus Torvalds committed
231 232 233 234 235

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

236
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
237
}
238
#endif
Linus Torvalds's avatar
Linus Torvalds committed
239 240 241 242 243

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

244
static void acpi_ac_notify(struct acpi_device *device, u32 event)
Linus Torvalds's avatar
Linus Torvalds committed
245
{
246
	struct acpi_ac *ac = acpi_driver_data(device);
Linus Torvalds's avatar
Linus Torvalds committed
247 248 249


	if (!ac)
250
		return;
Linus Torvalds's avatar
Linus Torvalds committed
251 252

	switch (event) {
253 254 255
	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Unsupported event [0x%x]\n", event));
Linus Torvalds's avatar
Linus Torvalds committed
256
	case ACPI_AC_NOTIFY_STATUS:
257 258
	case ACPI_NOTIFY_BUS_CHECK:
	case ACPI_NOTIFY_DEVICE_CHECK:
259 260 261 262 263 264 265 266 267 268
		/*
		 * A buggy BIOS may notify AC first and then sleep for
		 * a specific time before doing actual operations in the
		 * EC event handler (_Qxx). This will cause the AC state
		 * reported by the ACPI event to be incorrect, so wait for a
		 * specific time for the EC event handler to make progress.
		 */
		if (ac_sleep_before_get_state_ms > 0)
			msleep(ac_sleep_before_get_state_ms);

Linus Torvalds's avatar
Linus Torvalds committed
269
		acpi_ac_get_state(ac);
270
		acpi_bus_generate_proc_event(device, event, (u32) ac->state);
271
		acpi_bus_generate_netlink_event(device->pnp.device_class,
272
						  dev_name(&device->dev), event,
273
						  (u32) ac->state);
274
		acpi_notifier_call_chain(device, event, (u32) ac->state);
275
		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
Linus Torvalds's avatar
Linus Torvalds committed
276 277
	}

278
	return;
Linus Torvalds's avatar
Linus Torvalds committed
279 280
}

281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298
static int thinkpad_e530_quirk(const struct dmi_system_id *d)
{
	ac_sleep_before_get_state_ms = 1000;
	return 0;
}

static struct dmi_system_id ac_dmi_table[] = {
	{
	.callback = thinkpad_e530_quirk,
	.ident = "thinkpad e530",
	.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
		},
	},
	{},
};

299
static int acpi_ac_add(struct acpi_device *device)
Linus Torvalds's avatar
Linus Torvalds committed
300
{
301 302
	int result = 0;
	struct acpi_ac *ac = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
303 304 305


	if (!device)
306
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
307

308
	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
309
	if (!ac)
310
		return -ENOMEM;
Linus Torvalds's avatar
Linus Torvalds committed
311

312
	ac->device = device;
Linus Torvalds's avatar
Linus Torvalds committed
313 314
	strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_AC_CLASS);
315
	device->driver_data = ac;
Linus Torvalds's avatar
Linus Torvalds committed
316 317 318 319 320

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

321
#ifdef CONFIG_ACPI_PROCFS_POWER
Linus Torvalds's avatar
Linus Torvalds committed
322
	result = acpi_ac_add_fs(device);
323
#endif
Linus Torvalds's avatar
Linus Torvalds committed
324 325
	if (result)
		goto end;
326 327 328 329 330
	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;
331 332 333
	result = power_supply_register(&ac->device->dev, &ac->charger);
	if (result)
		goto end;
Linus Torvalds's avatar
Linus Torvalds committed
334

335 336 337
	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
	       acpi_device_name(device), acpi_device_bid(device),
	       ac->state ? "on-line" : "off-line");
Linus Torvalds's avatar
Linus Torvalds committed
338

339
      end:
Linus Torvalds's avatar
Linus Torvalds committed
340
	if (result) {
341
#ifdef CONFIG_ACPI_PROCFS_POWER
Linus Torvalds's avatar
Linus Torvalds committed
342
		acpi_ac_remove_fs(device);
343
#endif
Linus Torvalds's avatar
Linus Torvalds committed
344 345 346
		kfree(ac);
	}

347
	dmi_check_system(ac_dmi_table);
348
	return result;
Linus Torvalds's avatar
Linus Torvalds committed
349 350
}

351
#ifdef CONFIG_PM_SLEEP
352
static int acpi_ac_resume(struct device *dev)
353 354 355
{
	struct acpi_ac *ac;
	unsigned old_state;
356 357 358 359 360 361

	if (!dev)
		return -EINVAL;

	ac = acpi_driver_data(to_acpi_device(dev));
	if (!ac)
362
		return -EINVAL;
363

364 365 366 367 368 369 370
	old_state = ac->state;
	if (acpi_ac_get_state(ac))
		return 0;
	if (old_state != ac->state)
		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
	return 0;
}
371
#endif
372

373
static int acpi_ac_remove(struct acpi_device *device)
Linus Torvalds's avatar
Linus Torvalds committed
374
{
375
	struct acpi_ac *ac = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
376 377 378


	if (!device || !acpi_driver_data(device))
379
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
380

381
	ac = acpi_driver_data(device);
Linus Torvalds's avatar
Linus Torvalds committed
382

383 384
	if (ac->charger.dev)
		power_supply_unregister(&ac->charger);
385
#ifdef CONFIG_ACPI_PROCFS_POWER
Linus Torvalds's avatar
Linus Torvalds committed
386
	acpi_ac_remove_fs(device);
387
#endif
Linus Torvalds's avatar
Linus Torvalds committed
388 389 390

	kfree(ac);

391
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
392 393
}

394
static int __init acpi_ac_init(void)
Linus Torvalds's avatar
Linus Torvalds committed
395
{
396
	int result;
Linus Torvalds's avatar
Linus Torvalds committed
397

398 399
	if (acpi_disabled)
		return -ENODEV;
Linus Torvalds's avatar
Linus Torvalds committed
400

401
#ifdef CONFIG_ACPI_PROCFS_POWER
402
	acpi_ac_dir = acpi_lock_ac_dir();
Linus Torvalds's avatar
Linus Torvalds committed
403
	if (!acpi_ac_dir)
404
		return -ENODEV;
405
#endif
Linus Torvalds's avatar
Linus Torvalds committed
406 407 408

	result = acpi_bus_register_driver(&acpi_ac_driver);
	if (result < 0) {
409
#ifdef CONFIG_ACPI_PROCFS_POWER
410
		acpi_unlock_ac_dir(acpi_ac_dir);
411
#endif
412
		return -ENODEV;
Linus Torvalds's avatar
Linus Torvalds committed
413 414
	}

415
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
416 417
}

418
static void __exit acpi_ac_exit(void)
Linus Torvalds's avatar
Linus Torvalds committed
419 420 421 422
{

	acpi_bus_unregister_driver(&acpi_ac_driver);

423
#ifdef CONFIG_ACPI_PROCFS_POWER
424
	acpi_unlock_ac_dir(acpi_ac_dir);
425
#endif
Linus Torvalds's avatar
Linus Torvalds committed
426

427
	return;
Linus Torvalds's avatar
Linus Torvalds committed
428 429 430 431
}

module_init(acpi_ac_init);
module_exit(acpi_ac_exit);