Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/acpi/ac.c

  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 <linux/acpi.h>
 40 #include "battery.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
 53 ACPI_MODULE_NAME("ac");
 54 
 55 MODULE_AUTHOR("Paul Diefenbaugh");
 56 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
 57 MODULE_LICENSE("GPL");
 58 
 59 
 60 static int acpi_ac_add(struct acpi_device *device);
 61 static int acpi_ac_remove(struct acpi_device *device);
 62 static void acpi_ac_notify(struct acpi_device *device, u32 event);
 63 
 64 static const struct acpi_device_id ac_device_ids[] = {
 65         {"ACPI0003", 0},
 66         {"", 0},
 67 };
 68 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
 69 
 70 #ifdef CONFIG_PM_SLEEP
 71 static int acpi_ac_resume(struct device *dev);
 72 #endif
 73 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
 74 
 75 #ifdef CONFIG_ACPI_PROCFS_POWER
 76 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
 77 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
 78 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
 79 #endif
 80 
 81 
 82 static int ac_sleep_before_get_state_ms;
 83 
 84 static struct acpi_driver acpi_ac_driver = {
 85         .name = "ac",
 86         .class = ACPI_AC_CLASS,
 87         .ids = ac_device_ids,
 88         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 89         .ops = {
 90                 .add = acpi_ac_add,
 91                 .remove = acpi_ac_remove,
 92                 .notify = acpi_ac_notify,
 93                 },
 94         .drv.pm = &acpi_ac_pm,
 95 };
 96 
 97 struct acpi_ac {
 98         struct power_supply charger;
 99         struct acpi_device * device;
100         unsigned long long state;
101         struct notifier_block battery_nb;
102 };
103 
104 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
105 
106 #ifdef CONFIG_ACPI_PROCFS_POWER
107 static const struct file_operations acpi_ac_fops = {
108         .owner = THIS_MODULE,
109         .open = acpi_ac_open_fs,
110         .read = seq_read,
111         .llseek = seq_lseek,
112         .release = single_release,
113 };
114 #endif
115 
116 /* --------------------------------------------------------------------------
117                                AC Adapter Management
118    -------------------------------------------------------------------------- */
119 
120 static int acpi_ac_get_state(struct acpi_ac *ac)
121 {
122         acpi_status status = AE_OK;
123 
124         if (!ac)
125                 return -EINVAL;
126 
127         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
128                                        &ac->state);
129         if (ACPI_FAILURE(status)) {
130                 ACPI_EXCEPTION((AE_INFO, status,
131                                 "Error reading AC Adapter state"));
132                 ac->state = ACPI_AC_STATUS_UNKNOWN;
133                 return -ENODEV;
134         }
135 
136         return 0;
137 }
138 
139 /* --------------------------------------------------------------------------
140                             sysfs I/F
141    -------------------------------------------------------------------------- */
142 static int get_ac_property(struct power_supply *psy,
143                            enum power_supply_property psp,
144                            union power_supply_propval *val)
145 {
146         struct acpi_ac *ac = to_acpi_ac(psy);
147 
148         if (!ac)
149                 return -ENODEV;
150 
151         if (acpi_ac_get_state(ac))
152                 return -ENODEV;
153 
154         switch (psp) {
155         case POWER_SUPPLY_PROP_ONLINE:
156                 val->intval = ac->state;
157                 break;
158         default:
159                 return -EINVAL;
160         }
161         return 0;
162 }
163 
164 static enum power_supply_property ac_props[] = {
165         POWER_SUPPLY_PROP_ONLINE,
166 };
167 
168 #ifdef CONFIG_ACPI_PROCFS_POWER
169 /* --------------------------------------------------------------------------
170                               FS Interface (/proc)
171    -------------------------------------------------------------------------- */
172 
173 static struct proc_dir_entry *acpi_ac_dir;
174 
175 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
176 {
177         struct acpi_ac *ac = seq->private;
178 
179 
180         if (!ac)
181                 return 0;
182 
183         if (acpi_ac_get_state(ac)) {
184                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
185                 return 0;
186         }
187 
188         seq_puts(seq, "state:                   ");
189         switch (ac->state) {
190         case ACPI_AC_STATUS_OFFLINE:
191                 seq_puts(seq, "off-line\n");
192                 break;
193         case ACPI_AC_STATUS_ONLINE:
194                 seq_puts(seq, "on-line\n");
195                 break;
196         default:
197                 seq_puts(seq, "unknown\n");
198                 break;
199         }
200 
201         return 0;
202 }
203 
204 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
205 {
206         return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
207 }
208 
209 static int acpi_ac_add_fs(struct acpi_ac *ac)
210 {
211         struct proc_dir_entry *entry = NULL;
212 
213         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
214                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
215         if (!acpi_device_dir(ac->device)) {
216                 acpi_device_dir(ac->device) =
217                         proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir);
218                 if (!acpi_device_dir(ac->device))
219                         return -ENODEV;
220         }
221 
222         /* 'state' [R] */
223         entry = proc_create_data(ACPI_AC_FILE_STATE,
224                                  S_IRUGO, acpi_device_dir(ac->device),
225                                  &acpi_ac_fops, ac);
226         if (!entry)
227                 return -ENODEV;
228         return 0;
229 }
230 
231 static int acpi_ac_remove_fs(struct acpi_ac *ac)
232 {
233 
234         if (acpi_device_dir(ac->device)) {
235                 remove_proc_entry(ACPI_AC_FILE_STATE,
236                                   acpi_device_dir(ac->device));
237                 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir);
238                 acpi_device_dir(ac->device) = NULL;
239         }
240 
241         return 0;
242 }
243 #endif
244 
245 /* --------------------------------------------------------------------------
246                                    Driver Model
247    -------------------------------------------------------------------------- */
248 
249 static void acpi_ac_notify(struct acpi_device *device, u32 event)
250 {
251         struct acpi_ac *ac = acpi_driver_data(device);
252 
253         if (!ac)
254                 return;
255 
256         switch (event) {
257         default:
258                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
259                                   "Unsupported event [0x%x]\n", event));
260         case ACPI_AC_NOTIFY_STATUS:
261         case ACPI_NOTIFY_BUS_CHECK:
262         case ACPI_NOTIFY_DEVICE_CHECK:
263                 /*
264                  * A buggy BIOS may notify AC first and then sleep for
265                  * a specific time before doing actual operations in the
266                  * EC event handler (_Qxx). This will cause the AC state
267                  * reported by the ACPI event to be incorrect, so wait for a
268                  * specific time for the EC event handler to make progress.
269                  */
270                 if (ac_sleep_before_get_state_ms > 0)
271                         msleep(ac_sleep_before_get_state_ms);
272 
273                 acpi_ac_get_state(ac);
274                 acpi_bus_generate_netlink_event(device->pnp.device_class,
275                                                   dev_name(&device->dev), event,
276                                                   (u32) ac->state);
277                 acpi_notifier_call_chain(device, event, (u32) ac->state);
278                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
279         }
280 
281         return;
282 }
283 
284 static int acpi_ac_battery_notify(struct notifier_block *nb,
285                                   unsigned long action, void *data)
286 {
287         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
288         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
289 
290         /*
291          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
292          * when adapter is plugged/unplugged. However, battery status
293          * notifcations are triggered when battery starts charging or
294          * discharging. Re-reading AC status triggers lost AC notifications,
295          * if AC status has changed.
296          */
297         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
298             event->type == ACPI_BATTERY_NOTIFY_STATUS)
299                 acpi_ac_get_state(ac);
300 
301         return NOTIFY_OK;
302 }
303 
304 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
305 {
306         ac_sleep_before_get_state_ms = 1000;
307         return 0;
308 }
309 
310 static struct dmi_system_id ac_dmi_table[] = {
311         {
312         .callback = thinkpad_e530_quirk,
313         .ident = "thinkpad e530",
314         .matches = {
315                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
316                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
317                 },
318         },
319         {},
320 };
321 
322 static int acpi_ac_add(struct acpi_device *device)
323 {
324         int result = 0;
325         struct acpi_ac *ac = NULL;
326 
327 
328         if (!device)
329                 return -EINVAL;
330 
331         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
332         if (!ac)
333                 return -ENOMEM;
334 
335         ac->device = device;
336         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
337         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
338         device->driver_data = ac;
339 
340         result = acpi_ac_get_state(ac);
341         if (result)
342                 goto end;
343 
344         ac->charger.name = acpi_device_bid(device);
345 #ifdef CONFIG_ACPI_PROCFS_POWER
346         result = acpi_ac_add_fs(ac);
347         if (result)
348                 goto end;
349 #endif
350         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
351         ac->charger.properties = ac_props;
352         ac->charger.num_properties = ARRAY_SIZE(ac_props);
353         ac->charger.get_property = get_ac_property;
354         result = power_supply_register(&ac->device->dev, &ac->charger);
355         if (result)
356                 goto end;
357 
358         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
359                acpi_device_name(device), acpi_device_bid(device),
360                ac->state ? "on-line" : "off-line");
361 
362         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
363         register_acpi_notifier(&ac->battery_nb);
364 end:
365         if (result) {
366 #ifdef CONFIG_ACPI_PROCFS_POWER
367                 acpi_ac_remove_fs(ac);
368 #endif
369                 kfree(ac);
370         }
371 
372         dmi_check_system(ac_dmi_table);
373         return result;
374 }
375 
376 #ifdef CONFIG_PM_SLEEP
377 static int acpi_ac_resume(struct device *dev)
378 {
379         struct acpi_ac *ac;
380         unsigned old_state;
381 
382         if (!dev)
383                 return -EINVAL;
384 
385         ac = acpi_driver_data(to_acpi_device(dev));
386         if (!ac)
387                 return -EINVAL;
388 
389         old_state = ac->state;
390         if (acpi_ac_get_state(ac))
391                 return 0;
392         if (old_state != ac->state)
393                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
394         return 0;
395 }
396 #else
397 #define acpi_ac_resume NULL
398 #endif
399 
400 static int acpi_ac_remove(struct acpi_device *device)
401 {
402         struct acpi_ac *ac = NULL;
403 
404 
405         if (!device || !acpi_driver_data(device))
406                 return -EINVAL;
407 
408         ac = acpi_driver_data(device);
409 
410         if (ac->charger.dev)
411                 power_supply_unregister(&ac->charger);
412         unregister_acpi_notifier(&ac->battery_nb);
413 
414 #ifdef CONFIG_ACPI_PROCFS_POWER
415         acpi_ac_remove_fs(ac);
416 #endif
417 
418         kfree(ac);
419 
420         return 0;
421 }
422 
423 static int __init acpi_ac_init(void)
424 {
425         int result;
426 
427         if (acpi_disabled)
428                 return -ENODEV;
429 
430 #ifdef CONFIG_ACPI_PROCFS_POWER
431         acpi_ac_dir = acpi_lock_ac_dir();
432         if (!acpi_ac_dir)
433                 return -ENODEV;
434 #endif
435 
436 
437         result = acpi_bus_register_driver(&acpi_ac_driver);
438         if (result < 0) {
439 #ifdef CONFIG_ACPI_PROCFS_POWER
440                 acpi_unlock_ac_dir(acpi_ac_dir);
441 #endif
442                 return -ENODEV;
443         }
444 
445         return 0;
446 }
447 
448 static void __exit acpi_ac_exit(void)
449 {
450         acpi_bus_unregister_driver(&acpi_ac_driver);
451 #ifdef CONFIG_ACPI_PROCFS_POWER
452         acpi_unlock_ac_dir(acpi_ac_dir);
453 #endif
454 }
455 module_init(acpi_ac_init);
456 module_exit(acpi_ac_exit);
457 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us