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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 power_supply_desc charger_desc;
100         struct acpi_device * device;
101         unsigned long long state;
102         struct notifier_block battery_nb;
103 };
104 
105 #define to_acpi_ac(x) power_supply_get_drvdata(x)
106 
107 #ifdef CONFIG_ACPI_PROCFS_POWER
108 static const struct file_operations acpi_ac_fops = {
109         .owner = THIS_MODULE,
110         .open = acpi_ac_open_fs,
111         .read = seq_read,
112         .llseek = seq_lseek,
113         .release = single_release,
114 };
115 #endif
116 
117 /* --------------------------------------------------------------------------
118                                AC Adapter Management
119    -------------------------------------------------------------------------- */
120 
121 static int acpi_ac_get_state(struct acpi_ac *ac)
122 {
123         acpi_status status = AE_OK;
124 
125         if (!ac)
126                 return -EINVAL;
127 
128         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
129                                        &ac->state);
130         if (ACPI_FAILURE(status)) {
131                 ACPI_EXCEPTION((AE_INFO, status,
132                                 "Error reading AC Adapter state"));
133                 ac->state = ACPI_AC_STATUS_UNKNOWN;
134                 return -ENODEV;
135         }
136 
137         return 0;
138 }
139 
140 /* --------------------------------------------------------------------------
141                             sysfs I/F
142    -------------------------------------------------------------------------- */
143 static int get_ac_property(struct power_supply *psy,
144                            enum power_supply_property psp,
145                            union power_supply_propval *val)
146 {
147         struct acpi_ac *ac = to_acpi_ac(psy);
148 
149         if (!ac)
150                 return -ENODEV;
151 
152         if (acpi_ac_get_state(ac))
153                 return -ENODEV;
154 
155         switch (psp) {
156         case POWER_SUPPLY_PROP_ONLINE:
157                 val->intval = ac->state;
158                 break;
159         default:
160                 return -EINVAL;
161         }
162         return 0;
163 }
164 
165 static enum power_supply_property ac_props[] = {
166         POWER_SUPPLY_PROP_ONLINE,
167 };
168 
169 #ifdef CONFIG_ACPI_PROCFS_POWER
170 /* --------------------------------------------------------------------------
171                               FS Interface (/proc)
172    -------------------------------------------------------------------------- */
173 
174 static struct proc_dir_entry *acpi_ac_dir;
175 
176 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
177 {
178         struct acpi_ac *ac = seq->private;
179 
180 
181         if (!ac)
182                 return 0;
183 
184         if (acpi_ac_get_state(ac)) {
185                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
186                 return 0;
187         }
188 
189         seq_puts(seq, "state:                   ");
190         switch (ac->state) {
191         case ACPI_AC_STATUS_OFFLINE:
192                 seq_puts(seq, "off-line\n");
193                 break;
194         case ACPI_AC_STATUS_ONLINE:
195                 seq_puts(seq, "on-line\n");
196                 break;
197         default:
198                 seq_puts(seq, "unknown\n");
199                 break;
200         }
201 
202         return 0;
203 }
204 
205 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
206 {
207         return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
208 }
209 
210 static int acpi_ac_add_fs(struct acpi_ac *ac)
211 {
212         struct proc_dir_entry *entry = NULL;
213 
214         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
215                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
216         if (!acpi_device_dir(ac->device)) {
217                 acpi_device_dir(ac->device) =
218                         proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir);
219                 if (!acpi_device_dir(ac->device))
220                         return -ENODEV;
221         }
222 
223         /* 'state' [R] */
224         entry = proc_create_data(ACPI_AC_FILE_STATE,
225                                  S_IRUGO, acpi_device_dir(ac->device),
226                                  &acpi_ac_fops, ac);
227         if (!entry)
228                 return -ENODEV;
229         return 0;
230 }
231 
232 static int acpi_ac_remove_fs(struct acpi_ac *ac)
233 {
234 
235         if (acpi_device_dir(ac->device)) {
236                 remove_proc_entry(ACPI_AC_FILE_STATE,
237                                   acpi_device_dir(ac->device));
238                 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir);
239                 acpi_device_dir(ac->device) = NULL;
240         }
241 
242         return 0;
243 }
244 #endif
245 
246 /* --------------------------------------------------------------------------
247                                    Driver Model
248    -------------------------------------------------------------------------- */
249 
250 static void acpi_ac_notify(struct acpi_device *device, u32 event)
251 {
252         struct acpi_ac *ac = acpi_driver_data(device);
253 
254         if (!ac)
255                 return;
256 
257         switch (event) {
258         default:
259                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
260                                   "Unsupported event [0x%x]\n", event));
261         case ACPI_AC_NOTIFY_STATUS:
262         case ACPI_NOTIFY_BUS_CHECK:
263         case ACPI_NOTIFY_DEVICE_CHECK:
264                 /*
265                  * A buggy BIOS may notify AC first and then sleep for
266                  * a specific time before doing actual operations in the
267                  * EC event handler (_Qxx). This will cause the AC state
268                  * reported by the ACPI event to be incorrect, so wait for a
269                  * specific time for the EC event handler to make progress.
270                  */
271                 if (ac_sleep_before_get_state_ms > 0)
272                         msleep(ac_sleep_before_get_state_ms);
273 
274                 acpi_ac_get_state(ac);
275                 acpi_bus_generate_netlink_event(device->pnp.device_class,
276                                                   dev_name(&device->dev), event,
277                                                   (u32) ac->state);
278                 acpi_notifier_call_chain(device, event, (u32) ac->state);
279                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
280         }
281 
282         return;
283 }
284 
285 static int acpi_ac_battery_notify(struct notifier_block *nb,
286                                   unsigned long action, void *data)
287 {
288         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
289         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
290 
291         /*
292          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
293          * when adapter is plugged/unplugged. However, battery status
294          * notifcations are triggered when battery starts charging or
295          * discharging. Re-reading AC status triggers lost AC notifications,
296          * if AC status has changed.
297          */
298         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
299             event->type == ACPI_BATTERY_NOTIFY_STATUS)
300                 acpi_ac_get_state(ac);
301 
302         return NOTIFY_OK;
303 }
304 
305 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
306 {
307         ac_sleep_before_get_state_ms = 1000;
308         return 0;
309 }
310 
311 static struct dmi_system_id ac_dmi_table[] = {
312         {
313         .callback = thinkpad_e530_quirk,
314         .ident = "thinkpad e530",
315         .matches = {
316                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
317                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
318                 },
319         },
320         {},
321 };
322 
323 static int acpi_ac_add(struct acpi_device *device)
324 {
325         struct power_supply_config psy_cfg = {};
326         int result = 0;
327         struct acpi_ac *ac = NULL;
328 
329 
330         if (!device)
331                 return -EINVAL;
332 
333         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
334         if (!ac)
335                 return -ENOMEM;
336 
337         ac->device = device;
338         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
339         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
340         device->driver_data = ac;
341 
342         result = acpi_ac_get_state(ac);
343         if (result)
344                 goto end;
345 
346         psy_cfg.drv_data = ac;
347 
348         ac->charger_desc.name = acpi_device_bid(device);
349 #ifdef CONFIG_ACPI_PROCFS_POWER
350         result = acpi_ac_add_fs(ac);
351         if (result)
352                 goto end;
353 #endif
354         ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
355         ac->charger_desc.properties = ac_props;
356         ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
357         ac->charger_desc.get_property = get_ac_property;
358         ac->charger = power_supply_register(&ac->device->dev,
359                                             &ac->charger_desc, &psy_cfg);
360         if (IS_ERR(ac->charger)) {
361                 result = PTR_ERR(ac->charger);
362                 goto end;
363         }
364 
365         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
366                acpi_device_name(device), acpi_device_bid(device),
367                ac->state ? "on-line" : "off-line");
368 
369         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
370         register_acpi_notifier(&ac->battery_nb);
371 end:
372         if (result) {
373 #ifdef CONFIG_ACPI_PROCFS_POWER
374                 acpi_ac_remove_fs(ac);
375 #endif
376                 kfree(ac);
377         }
378 
379         dmi_check_system(ac_dmi_table);
380         return result;
381 }
382 
383 #ifdef CONFIG_PM_SLEEP
384 static int acpi_ac_resume(struct device *dev)
385 {
386         struct acpi_ac *ac;
387         unsigned old_state;
388 
389         if (!dev)
390                 return -EINVAL;
391 
392         ac = acpi_driver_data(to_acpi_device(dev));
393         if (!ac)
394                 return -EINVAL;
395 
396         old_state = ac->state;
397         if (acpi_ac_get_state(ac))
398                 return 0;
399         if (old_state != ac->state)
400                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
401         return 0;
402 }
403 #else
404 #define acpi_ac_resume NULL
405 #endif
406 
407 static int acpi_ac_remove(struct acpi_device *device)
408 {
409         struct acpi_ac *ac = NULL;
410 
411 
412         if (!device || !acpi_driver_data(device))
413                 return -EINVAL;
414 
415         ac = acpi_driver_data(device);
416 
417         power_supply_unregister(ac->charger);
418         unregister_acpi_notifier(&ac->battery_nb);
419 
420 #ifdef CONFIG_ACPI_PROCFS_POWER
421         acpi_ac_remove_fs(ac);
422 #endif
423 
424         kfree(ac);
425 
426         return 0;
427 }
428 
429 static int __init acpi_ac_init(void)
430 {
431         int result;
432 
433         if (acpi_disabled)
434                 return -ENODEV;
435 
436 #ifdef CONFIG_ACPI_PROCFS_POWER
437         acpi_ac_dir = acpi_lock_ac_dir();
438         if (!acpi_ac_dir)
439                 return -ENODEV;
440 #endif
441 
442 
443         result = acpi_bus_register_driver(&acpi_ac_driver);
444         if (result < 0) {
445 #ifdef CONFIG_ACPI_PROCFS_POWER
446                 acpi_unlock_ac_dir(acpi_ac_dir);
447 #endif
448                 return -ENODEV;
449         }
450 
451         return 0;
452 }
453 
454 static void __exit acpi_ac_exit(void)
455 {
456         acpi_bus_unregister_driver(&acpi_ac_driver);
457 #ifdef CONFIG_ACPI_PROCFS_POWER
458         acpi_unlock_ac_dir(acpi_ac_dir);
459 #endif
460 }
461 module_init(acpi_ac_init);
462 module_exit(acpi_ac_exit);
463 

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