ac.c 7.33 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 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
/*
 *  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>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define ACPI_AC_COMPONENT		0x00020000
#define ACPI_AC_CLASS			"ac_adapter"
#define ACPI_AC_HID 			"ACPI0003"
#define ACPI_AC_DRIVER_NAME		"ACPI AC Adapter Driver"
#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
Len Brown's avatar
Len Brown committed
47
ACPI_MODULE_NAME("acpi_ac")
Linus Torvalds's avatar
Linus Torvalds committed
48

Len Brown's avatar
Len Brown committed
49
    MODULE_AUTHOR("Paul Diefenbaugh");
Linus Torvalds's avatar
Linus Torvalds committed
50 51 52
MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME);
MODULE_LICENSE("GPL");

53 54 55
extern struct proc_dir_entry *acpi_lock_ac_dir(void);
extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);

Len Brown's avatar
Len Brown committed
56 57
static int acpi_ac_add(struct acpi_device *device);
static int acpi_ac_remove(struct acpi_device *device, int type);
Linus Torvalds's avatar
Linus Torvalds committed
58 59 60
static int acpi_ac_open_fs(struct inode *inode, struct file *file);

static struct acpi_driver acpi_ac_driver = {
Len Brown's avatar
Len Brown committed
61 62 63 64 65 66 67
	.name = ACPI_AC_DRIVER_NAME,
	.class = ACPI_AC_CLASS,
	.ids = ACPI_AC_HID,
	.ops = {
		.add = acpi_ac_add,
		.remove = acpi_ac_remove,
		},
Linus Torvalds's avatar
Linus Torvalds committed
68 69 70
};

struct acpi_ac {
71
	struct acpi_device * device;
Len Brown's avatar
Len Brown committed
72
	unsigned long state;
Linus Torvalds's avatar
Linus Torvalds committed
73 74
};

75
static const struct file_operations acpi_ac_fops = {
Len Brown's avatar
Len Brown committed
76 77 78 79
	.open = acpi_ac_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
Linus Torvalds's avatar
Linus Torvalds committed
80 81 82 83 84 85
};

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

Len Brown's avatar
Len Brown committed
86
static int acpi_ac_get_state(struct acpi_ac *ac)
Linus Torvalds's avatar
Linus Torvalds committed
87
{
Len Brown's avatar
Len Brown committed
88
	acpi_status status = AE_OK;
Linus Torvalds's avatar
Linus Torvalds committed
89 90 91


	if (!ac)
92
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
93

94
	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
Linus Torvalds's avatar
Linus Torvalds committed
95
	if (ACPI_FAILURE(status)) {
96
		ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
Linus Torvalds's avatar
Linus Torvalds committed
97
		ac->state = ACPI_AC_STATUS_UNKNOWN;
98
		return -ENODEV;
Linus Torvalds's avatar
Linus Torvalds committed
99
	}
Len Brown's avatar
Len Brown committed
100

101
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
102 103 104 105 106 107
}

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

Len Brown's avatar
Len Brown committed
108
static struct proc_dir_entry *acpi_ac_dir;
Linus Torvalds's avatar
Linus Torvalds committed
109 110 111

static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
{
Len Brown's avatar
Len Brown committed
112
	struct acpi_ac *ac = (struct acpi_ac *)seq->private;
Linus Torvalds's avatar
Linus Torvalds committed
113 114 115


	if (!ac)
116
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
117 118 119

	if (acpi_ac_get_state(ac)) {
		seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
120
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
121 122 123 124 125 126 127 128 129 130 131 132 133 134 135
	}

	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;
	}

136
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
137
}
Len Brown's avatar
Len Brown committed
138

Linus Torvalds's avatar
Linus Torvalds committed
139 140 141 142 143
static int acpi_ac_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
}

Len Brown's avatar
Len Brown committed
144
static int acpi_ac_add_fs(struct acpi_device *device)
Linus Torvalds's avatar
Linus Torvalds committed
145
{
Len Brown's avatar
Len Brown committed
146
	struct proc_dir_entry *entry = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
147 148 149 150


	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown's avatar
Len Brown committed
151
						     acpi_ac_dir);
Linus Torvalds's avatar
Linus Torvalds committed
152
		if (!acpi_device_dir(device))
153
			return -ENODEV;
Linus Torvalds's avatar
Linus Torvalds committed
154 155 156 157 158
		acpi_device_dir(device)->owner = THIS_MODULE;
	}

	/* 'state' [R] */
	entry = create_proc_entry(ACPI_AC_FILE_STATE,
Len Brown's avatar
Len Brown committed
159
				  S_IRUGO, acpi_device_dir(device));
Linus Torvalds's avatar
Linus Torvalds committed
160
	if (!entry)
161
		return -ENODEV;
Linus Torvalds's avatar
Linus Torvalds committed
162 163 164 165 166 167
	else {
		entry->proc_fops = &acpi_ac_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

168
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
169 170
}

Len Brown's avatar
Len Brown committed
171
static int acpi_ac_remove_fs(struct acpi_device *device)
Linus Torvalds's avatar
Linus Torvalds committed
172 173 174
{

	if (acpi_device_dir(device)) {
Len Brown's avatar
Len Brown committed
175
		remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
Linus Torvalds's avatar
Linus Torvalds committed
176 177 178 179 180

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

181
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
182 183 184 185 186 187
}

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

Len Brown's avatar
Len Brown committed
188
static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
Linus Torvalds's avatar
Linus Torvalds committed
189
{
Len Brown's avatar
Len Brown committed
190 191
	struct acpi_ac *ac = (struct acpi_ac *)data;
	struct acpi_device *device = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
192 193 194


	if (!ac)
195
		return;
Linus Torvalds's avatar
Linus Torvalds committed
196

197
	device = ac->device;
Linus Torvalds's avatar
Linus Torvalds committed
198 199
	switch (event) {
	case ACPI_AC_NOTIFY_STATUS:
200 201
	case ACPI_NOTIFY_BUS_CHECK:
	case ACPI_NOTIFY_DEVICE_CHECK:
Linus Torvalds's avatar
Linus Torvalds committed
202 203 204 205 206
		acpi_ac_get_state(ac);
		acpi_bus_generate_event(device, event, (u32) ac->state);
		break;
	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown's avatar
Len Brown committed
207
				  "Unsupported event [0x%x]\n", event));
Linus Torvalds's avatar
Linus Torvalds committed
208 209 210
		break;
	}

211
	return;
Linus Torvalds's avatar
Linus Torvalds committed
212 213
}

Len Brown's avatar
Len Brown committed
214
static int acpi_ac_add(struct acpi_device *device)
Linus Torvalds's avatar
Linus Torvalds committed
215
{
Len Brown's avatar
Len Brown committed
216 217 218
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_ac *ac = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
219 220 221


	if (!device)
222
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
223 224 225

	ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
	if (!ac)
226
		return -ENOMEM;
Linus Torvalds's avatar
Linus Torvalds committed
227 228
	memset(ac, 0, sizeof(struct acpi_ac));

229
	ac->device = device;
Linus Torvalds's avatar
Linus Torvalds committed
230 231 232 233 234 235 236 237 238 239 240 241
	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;

	result = acpi_ac_add_fs(device);
	if (result)
		goto end;

242
	status = acpi_install_notify_handler(device->handle,
243
					     ACPI_ALL_NOTIFY, acpi_ac_notify,
Len Brown's avatar
Len Brown committed
244
					     ac);
Linus Torvalds's avatar
Linus Torvalds committed
245 246 247 248 249
	if (ACPI_FAILURE(status)) {
		result = -ENODEV;
		goto end;
	}

Len Brown's avatar
Len Brown committed
250 251 252
	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
253

Len Brown's avatar
Len Brown committed
254
      end:
Linus Torvalds's avatar
Linus Torvalds committed
255 256 257 258 259
	if (result) {
		acpi_ac_remove_fs(device);
		kfree(ac);
	}

260
	return result;
Linus Torvalds's avatar
Linus Torvalds committed
261 262
}

Len Brown's avatar
Len Brown committed
263
static int acpi_ac_remove(struct acpi_device *device, int type)
Linus Torvalds's avatar
Linus Torvalds committed
264
{
Len Brown's avatar
Len Brown committed
265 266
	acpi_status status = AE_OK;
	struct acpi_ac *ac = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
267 268 269


	if (!device || !acpi_driver_data(device))
270
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
271

Len Brown's avatar
Len Brown committed
272
	ac = (struct acpi_ac *)acpi_driver_data(device);
Linus Torvalds's avatar
Linus Torvalds committed
273

274
	status = acpi_remove_notify_handler(device->handle,
275
					    ACPI_ALL_NOTIFY, acpi_ac_notify);
Linus Torvalds's avatar
Linus Torvalds committed
276 277 278 279 280

	acpi_ac_remove_fs(device);

	kfree(ac);

281
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
282 283
}

Len Brown's avatar
Len Brown committed
284
static int __init acpi_ac_init(void)
Linus Torvalds's avatar
Linus Torvalds committed
285
{
286
	int result;
Linus Torvalds's avatar
Linus Torvalds committed
287 288


289
	acpi_ac_dir = acpi_lock_ac_dir();
Linus Torvalds's avatar
Linus Torvalds committed
290
	if (!acpi_ac_dir)
291
		return -ENODEV;
Linus Torvalds's avatar
Linus Torvalds committed
292 293 294

	result = acpi_bus_register_driver(&acpi_ac_driver);
	if (result < 0) {
295
		acpi_unlock_ac_dir(acpi_ac_dir);
296
		return -ENODEV;
Linus Torvalds's avatar
Linus Torvalds committed
297 298
	}

299
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
300 301
}

Len Brown's avatar
Len Brown committed
302
static void __exit acpi_ac_exit(void)
Linus Torvalds's avatar
Linus Torvalds committed
303 304 305 306
{

	acpi_bus_unregister_driver(&acpi_ac_driver);

307
	acpi_unlock_ac_dir(acpi_ac_dir);
Linus Torvalds's avatar
Linus Torvalds committed
308

309
	return;
Linus Torvalds's avatar
Linus Torvalds committed
310 311 312 313
}

module_init(acpi_ac_init);
module_exit(acpi_ac_exit);