ac.c revision cc8ef52707341e67a12067d6ead991d56ea017ca 
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#include <linux/dmi.h>
32#include <linux/delay.h>
33#ifdef CONFIG_ACPI_PROCFS_POWER
34#include <linux/proc_fs.h>
35#include <linux/seq_file.h>
36#endif
37#include <linux/platform_device.h>
38#include <linux/power_supply.h>
39#include <acpi/acpi_bus.h>
40#include <acpi/acpi_drivers.h>
41
42#define PREFIX "ACPI: "
43
44#define ACPI_AC_CLASS			"ac_adapter"
45#define ACPI_AC_DEVICE_NAME		"AC Adapter"
46#define ACPI_AC_FILE_STATE		"state"
47#define ACPI_AC_NOTIFY_STATUS		0x80
48#define ACPI_AC_STATUS_OFFLINE		0x00
49#define ACPI_AC_STATUS_ONLINE		0x01
50#define ACPI_AC_STATUS_UNKNOWN		0xFF
51
52#define _COMPONENT		ACPI_AC_COMPONENT
53ACPI_MODULE_NAME("ac");
54
55MODULE_AUTHOR("Paul Diefenbaugh");
56MODULE_DESCRIPTION("ACPI AC Adapter Driver");
57MODULE_LICENSE("GPL");
58
59#ifdef CONFIG_ACPI_PROCFS_POWER
60extern struct proc_dir_entry *acpi_lock_ac_dir(void);
61extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
62static int acpi_ac_open_fs(struct inode *inode, struct file *file);
63#endif
64
65static int ac_sleep_before_get_state_ms;
66
67struct acpi_ac {
68	struct power_supply charger;
69	struct acpi_device *adev;
70	struct platform_device *pdev;
71	unsigned long long state;
72};
73
74#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
75
76#ifdef CONFIG_ACPI_PROCFS_POWER
77static const struct file_operations acpi_ac_fops = {
78	.owner = THIS_MODULE,
79	.open = acpi_ac_open_fs,
80	.read = seq_read,
81	.llseek = seq_lseek,
82	.release = single_release,
83};
84#endif
85
86/* --------------------------------------------------------------------------
87                               AC Adapter Management
88   -------------------------------------------------------------------------- */
89
90static int acpi_ac_get_state(struct acpi_ac *ac)
91{
92	acpi_status status;
93
94	status = acpi_evaluate_integer(ac->adev->handle, "_PSR", NULL,
95				       &ac->state);
96	if (ACPI_FAILURE(status)) {
97		ACPI_EXCEPTION((AE_INFO, status,
98				"Error reading AC Adapter state"));
99		ac->state = ACPI_AC_STATUS_UNKNOWN;
100		return -ENODEV;
101	}
102
103	return 0;
104}
105
106/* --------------------------------------------------------------------------
107                            sysfs I/F
108   -------------------------------------------------------------------------- */
109static int get_ac_property(struct power_supply *psy,
110			   enum power_supply_property psp,
111			   union power_supply_propval *val)
112{
113	struct acpi_ac *ac = to_acpi_ac(psy);
114
115	if (!ac)
116		return -ENODEV;
117
118	if (acpi_ac_get_state(ac))
119		return -ENODEV;
120
121	switch (psp) {
122	case POWER_SUPPLY_PROP_ONLINE:
123		val->intval = ac->state;
124		break;
125	default:
126		return -EINVAL;
127	}
128	return 0;
129}
130
131static enum power_supply_property ac_props[] = {
132	POWER_SUPPLY_PROP_ONLINE,
133};
134
135#ifdef CONFIG_ACPI_PROCFS_POWER
136/* --------------------------------------------------------------------------
137                              FS Interface (/proc)
138   -------------------------------------------------------------------------- */
139
140static struct proc_dir_entry *acpi_ac_dir;
141
142static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
143{
144	struct acpi_ac *ac = seq->private;
145
146
147	if (!ac)
148		return 0;
149
150	if (acpi_ac_get_state(ac)) {
151		seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
152		return 0;
153	}
154
155	seq_puts(seq, "state:                   ");
156	switch (ac->state) {
157	case ACPI_AC_STATUS_OFFLINE:
158		seq_puts(seq, "off-line\n");
159		break;
160	case ACPI_AC_STATUS_ONLINE:
161		seq_puts(seq, "on-line\n");
162		break;
163	default:
164		seq_puts(seq, "unknown\n");
165		break;
166	}
167
168	return 0;
169}
170
171static int acpi_ac_open_fs(struct inode *inode, struct file *file)
172{
173	return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
174}
175
176static int acpi_ac_add_fs(struct acpi_ac *ac)
177{
178	struct proc_dir_entry *entry = NULL;
179
180	printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
181			" please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
182	if (!acpi_device_dir(ac->adev)) {
183		acpi_device_dir(ac->adev) =
184			proc_mkdir(acpi_device_bid(ac->adev), acpi_ac_dir);
185		if (!acpi_device_dir(ac->adev))
186			return -ENODEV;
187	}
188
189	/* 'state' [R] */
190	entry = proc_create_data(ACPI_AC_FILE_STATE,
191				 S_IRUGO, acpi_device_dir(ac->adev),
192				 &acpi_ac_fops, ac);
193	if (!entry)
194		return -ENODEV;
195	return 0;
196}
197
198static int acpi_ac_remove_fs(struct acpi_ac *ac)
199{
200
201	if (acpi_device_dir(ac->adev)) {
202		remove_proc_entry(ACPI_AC_FILE_STATE,
203				  acpi_device_dir(ac->adev));
204		remove_proc_entry(acpi_device_bid(ac->adev), acpi_ac_dir);
205		acpi_device_dir(ac->adev) = NULL;
206	}
207
208	return 0;
209}
210#endif
211
212/* --------------------------------------------------------------------------
213                                   Driver Model
214   -------------------------------------------------------------------------- */
215
216static void acpi_ac_notify_handler(acpi_handle handle, u32 event, void *data)
217{
218	struct acpi_ac *ac = data;
219
220	if (!ac)
221		return;
222
223	switch (event) {
224	default:
225		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
226				  "Unsupported event [0x%x]\n", event));
227	case ACPI_AC_NOTIFY_STATUS:
228	case ACPI_NOTIFY_BUS_CHECK:
229	case ACPI_NOTIFY_DEVICE_CHECK:
230		/*
231		 * A buggy BIOS may notify AC first and then sleep for
232		 * a specific time before doing actual operations in the
233		 * EC event handler (_Qxx). This will cause the AC state
234		 * reported by the ACPI event to be incorrect, so wait for a
235		 * specific time for the EC event handler to make progress.
236		 */
237		if (ac_sleep_before_get_state_ms > 0)
238			msleep(ac_sleep_before_get_state_ms);
239
240		acpi_ac_get_state(ac);
241		acpi_bus_generate_netlink_event(ac->adev->pnp.device_class,
242						dev_name(&ac->pdev->dev),
243						event, (u32) ac->state);
244		acpi_notifier_call_chain(ac->adev, event, (u32) ac->state);
245		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
246	}
247
248	return;
249}
250
251static int thinkpad_e530_quirk(const struct dmi_system_id *d)
252{
253	ac_sleep_before_get_state_ms = 1000;
254	return 0;
255}
256
257static struct dmi_system_id ac_dmi_table[] = {
258	{
259	.callback = thinkpad_e530_quirk,
260	.ident = "thinkpad e530",
261	.matches = {
262		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
263		DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
264		},
265	},
266	{},
267};
268
269static int acpi_ac_probe(struct platform_device *pdev)
270{
271	int result = 0;
272	struct acpi_ac *ac = NULL;
273	struct acpi_device *adev;
274
275	if (!pdev)
276		return -EINVAL;
277
278	result = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
279	if (result)
280		return -ENODEV;
281
282	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
283	if (!ac)
284		return -ENOMEM;
285
286	strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
287	strcpy(acpi_device_class(adev), ACPI_AC_CLASS);
288	ac->adev = adev;
289	ac->pdev = pdev;
290	platform_set_drvdata(pdev, ac);
291
292	result = acpi_ac_get_state(ac);
293	if (result)
294		goto end;
295
296#ifdef CONFIG_ACPI_PROCFS_POWER
297	result = acpi_ac_add_fs(ac);
298	if (result)
299		goto end;
300#endif
301	ac->charger.name = acpi_device_bid(adev);
302	ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
303	ac->charger.properties = ac_props;
304	ac->charger.num_properties = ARRAY_SIZE(ac_props);
305	ac->charger.get_property = get_ac_property;
306	result = power_supply_register(&pdev->dev, &ac->charger);
307	if (result)
308		goto end;
309
310	result = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
311			ACPI_DEVICE_NOTIFY, acpi_ac_notify_handler, ac);
312	if (result) {
313		power_supply_unregister(&ac->charger);
314		goto end;
315	}
316	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
317	       acpi_device_name(adev), acpi_device_bid(adev),
318	       ac->state ? "on-line" : "off-line");
319
320      end:
321	if (result) {
322#ifdef CONFIG_ACPI_PROCFS_POWER
323		acpi_ac_remove_fs(ac);
324#endif
325		kfree(ac);
326	}
327
328	dmi_check_system(ac_dmi_table);
329	return result;
330}
331
332#ifdef CONFIG_PM_SLEEP
333static int acpi_ac_resume(struct device *dev)
334{
335	struct acpi_ac *ac;
336	unsigned old_state;
337
338	if (!dev)
339		return -EINVAL;
340
341	ac = platform_get_drvdata(to_platform_device(dev));
342	if (!ac)
343		return -EINVAL;
344
345	old_state = ac->state;
346	if (acpi_ac_get_state(ac))
347		return 0;
348	if (old_state != ac->state)
349		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
350	return 0;
351}
352#endif
353static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops, NULL, acpi_ac_resume);
354
355static int acpi_ac_remove(struct platform_device *pdev)
356{
357	struct acpi_ac *ac;
358
359	if (!pdev)
360		return -EINVAL;
361
362	acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
363			ACPI_DEVICE_NOTIFY, acpi_ac_notify_handler);
364
365	ac = platform_get_drvdata(pdev);
366	if (ac->charger.dev)
367		power_supply_unregister(&ac->charger);
368
369#ifdef CONFIG_ACPI_PROCFS_POWER
370	acpi_ac_remove_fs(ac);
371#endif
372
373	kfree(ac);
374
375	return 0;
376}
377
378static const struct acpi_device_id acpi_ac_match[] = {
379	{ "ACPI0003", 0 },
380	{ }
381};
382MODULE_DEVICE_TABLE(acpi, acpi_ac_match);
383
384static struct platform_driver acpi_ac_driver = {
385	.probe          = acpi_ac_probe,
386	.remove         = acpi_ac_remove,
387	.driver         = {
388		.name   = "acpi-ac",
389		.owner  = THIS_MODULE,
390		.pm     = &acpi_ac_pm_ops,
391		.acpi_match_table = ACPI_PTR(acpi_ac_match),
392	},
393};
394
395static int __init acpi_ac_init(void)
396{
397	int result;
398
399	if (acpi_disabled)
400		return -ENODEV;
401
402#ifdef CONFIG_ACPI_PROCFS_POWER
403	acpi_ac_dir = acpi_lock_ac_dir();
404	if (!acpi_ac_dir)
405		return -ENODEV;
406#endif
407
408	result = platform_driver_register(&acpi_ac_driver);
409	if (result < 0) {
410#ifdef CONFIG_ACPI_PROCFS_POWER
411		acpi_unlock_ac_dir(acpi_ac_dir);
412#endif
413		return -ENODEV;
414	}
415
416	return 0;
417}
418
419static void __exit acpi_ac_exit(void)
420{
421	platform_driver_unregister(&acpi_ac_driver);
422#ifdef CONFIG_ACPI_PROCFS_POWER
423	acpi_unlock_ac_dir(acpi_ac_dir);
424#endif
425}
426module_init(acpi_ac_init);
427module_exit(acpi_ac_exit);
428