xref: /openbmc/linux/drivers/acpi/ac.c (revision 643d1f7f)
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
50 ACPI_MODULE_NAME("ac");
51 
52 MODULE_AUTHOR("Paul Diefenbaugh");
53 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
54 MODULE_LICENSE("GPL");
55 
56 #ifdef CONFIG_ACPI_PROCFS_POWER
57 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
58 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
59 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
60 #endif
61 
62 static int acpi_ac_add(struct acpi_device *device);
63 static int acpi_ac_remove(struct acpi_device *device, int type);
64 static int acpi_ac_resume(struct acpi_device *device);
65 
66 const static struct acpi_device_id ac_device_ids[] = {
67 	{"ACPI0003", 0},
68 	{"", 0},
69 };
70 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
71 
72 static 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 
83 struct 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
94 static 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
102 static 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 
117 static enum power_supply_property ac_props[] = {
118 	POWER_SUPPLY_PROP_ONLINE,
119 };
120 #endif
121 /* --------------------------------------------------------------------------
122                                AC Adapter Management
123    -------------------------------------------------------------------------- */
124 
125 static 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 
148 static struct proc_dir_entry *acpi_ac_dir;
149 
150 static 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 
179 static 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 
184 static 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 
211 static 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 
229 static 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 
261 static 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 
320 static 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 
337 static 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 
363 static 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 
387 static 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 
399 module_init(acpi_ac_init);
400 module_exit(acpi_ac_exit);
401