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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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 20  */
 21 
 22 #include <linux/kernel.h>
 23 #include <linux/module.h>
 24 #include <linux/slab.h>
 25 #include <linux/init.h>
 26 #include <linux/types.h>
 27 #include <linux/dmi.h>
 28 #include <linux/delay.h>
 29 #ifdef CONFIG_ACPI_PROCFS_POWER
 30 #include <linux/proc_fs.h>
 31 #include <linux/seq_file.h>
 32 #endif
 33 #include <linux/platform_device.h>
 34 #include <linux/power_supply.h>
 35 #include <linux/acpi.h>
 36 #include "battery.h"
 37 
 38 #define PREFIX "ACPI: "
 39 
 40 #define ACPI_AC_CLASS                   "ac_adapter"
 41 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
 42 #define ACPI_AC_FILE_STATE              "state"
 43 #define ACPI_AC_NOTIFY_STATUS           0x80
 44 #define ACPI_AC_STATUS_OFFLINE          0x00
 45 #define ACPI_AC_STATUS_ONLINE           0x01
 46 #define ACPI_AC_STATUS_UNKNOWN          0xFF
 47 
 48 #define _COMPONENT              ACPI_AC_COMPONENT
 49 ACPI_MODULE_NAME("ac");
 50 
 51 MODULE_AUTHOR("Paul Diefenbaugh");
 52 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
 53 MODULE_LICENSE("GPL");
 54 
 55 
 56 static int acpi_ac_add(struct acpi_device *device);
 57 static int acpi_ac_remove(struct acpi_device *device);
 58 static void acpi_ac_notify(struct acpi_device *device, u32 event);
 59 
 60 static const struct acpi_device_id ac_device_ids[] = {
 61         {"ACPI0003", 0},
 62         {"", 0},
 63 };
 64 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
 65 
 66 #ifdef CONFIG_PM_SLEEP
 67 static int acpi_ac_resume(struct device *dev);
 68 #endif
 69 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
 70 
 71 #ifdef CONFIG_ACPI_PROCFS_POWER
 72 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
 73 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
 74 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
 75 #endif
 76 
 77 
 78 static int ac_sleep_before_get_state_ms;
 79 
 80 static struct acpi_driver acpi_ac_driver = {
 81         .name = "ac",
 82         .class = ACPI_AC_CLASS,
 83         .ids = ac_device_ids,
 84         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 85         .ops = {
 86                 .add = acpi_ac_add,
 87                 .remove = acpi_ac_remove,
 88                 .notify = acpi_ac_notify,
 89                 },
 90         .drv.pm = &acpi_ac_pm,
 91 };
 92 
 93 struct acpi_ac {
 94         struct power_supply *charger;
 95         struct power_supply_desc charger_desc;
 96         struct acpi_device * device;
 97         unsigned long long state;
 98         struct notifier_block battery_nb;
 99 };
100 
101 #define to_acpi_ac(x) power_supply_get_drvdata(x)
102 
103 #ifdef CONFIG_ACPI_PROCFS_POWER
104 static const struct file_operations acpi_ac_fops = {
105         .owner = THIS_MODULE,
106         .open = acpi_ac_open_fs,
107         .read = seq_read,
108         .llseek = seq_lseek,
109         .release = single_release,
110 };
111 #endif
112 
113 /* --------------------------------------------------------------------------
114                                AC Adapter Management
115    -------------------------------------------------------------------------- */
116 
117 static int acpi_ac_get_state(struct acpi_ac *ac)
118 {
119         acpi_status status = AE_OK;
120 
121         if (!ac)
122                 return -EINVAL;
123 
124         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
125                                        &ac->state);
126         if (ACPI_FAILURE(status)) {
127                 ACPI_EXCEPTION((AE_INFO, status,
128                                 "Error reading AC Adapter state"));
129                 ac->state = ACPI_AC_STATUS_UNKNOWN;
130                 return -ENODEV;
131         }
132 
133         return 0;
134 }
135 
136 /* --------------------------------------------------------------------------
137                             sysfs I/F
138    -------------------------------------------------------------------------- */
139 static int get_ac_property(struct power_supply *psy,
140                            enum power_supply_property psp,
141                            union power_supply_propval *val)
142 {
143         struct acpi_ac *ac = to_acpi_ac(psy);
144 
145         if (!ac)
146                 return -ENODEV;
147 
148         if (acpi_ac_get_state(ac))
149                 return -ENODEV;
150 
151         switch (psp) {
152         case POWER_SUPPLY_PROP_ONLINE:
153                 val->intval = ac->state;
154                 break;
155         default:
156                 return -EINVAL;
157         }
158         return 0;
159 }
160 
161 static enum power_supply_property ac_props[] = {
162         POWER_SUPPLY_PROP_ONLINE,
163 };
164 
165 #ifdef CONFIG_ACPI_PROCFS_POWER
166 /* --------------------------------------------------------------------------
167                               FS Interface (/proc)
168    -------------------------------------------------------------------------- */
169 
170 static struct proc_dir_entry *acpi_ac_dir;
171 
172 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
173 {
174         struct acpi_ac *ac = seq->private;
175 
176 
177         if (!ac)
178                 return 0;
179 
180         if (acpi_ac_get_state(ac)) {
181                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
182                 return 0;
183         }
184 
185         seq_puts(seq, "state:                   ");
186         switch (ac->state) {
187         case ACPI_AC_STATUS_OFFLINE:
188                 seq_puts(seq, "off-line\n");
189                 break;
190         case ACPI_AC_STATUS_ONLINE:
191                 seq_puts(seq, "on-line\n");
192                 break;
193         default:
194                 seq_puts(seq, "unknown\n");
195                 break;
196         }
197 
198         return 0;
199 }
200 
201 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
202 {
203         return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
204 }
205 
206 static int acpi_ac_add_fs(struct acpi_ac *ac)
207 {
208         struct proc_dir_entry *entry = NULL;
209 
210         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
211                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
212         if (!acpi_device_dir(ac->device)) {
213                 acpi_device_dir(ac->device) =
214                         proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir);
215                 if (!acpi_device_dir(ac->device))
216                         return -ENODEV;
217         }
218 
219         /* 'state' [R] */
220         entry = proc_create_data(ACPI_AC_FILE_STATE,
221                                  S_IRUGO, acpi_device_dir(ac->device),
222                                  &acpi_ac_fops, ac);
223         if (!entry)
224                 return -ENODEV;
225         return 0;
226 }
227 
228 static int acpi_ac_remove_fs(struct acpi_ac *ac)
229 {
230 
231         if (acpi_device_dir(ac->device)) {
232                 remove_proc_entry(ACPI_AC_FILE_STATE,
233                                   acpi_device_dir(ac->device));
234                 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir);
235                 acpi_device_dir(ac->device) = NULL;
236         }
237 
238         return 0;
239 }
240 #endif
241 
242 /* --------------------------------------------------------------------------
243                                    Driver Model
244    -------------------------------------------------------------------------- */
245 
246 static void acpi_ac_notify(struct acpi_device *device, u32 event)
247 {
248         struct acpi_ac *ac = acpi_driver_data(device);
249 
250         if (!ac)
251                 return;
252 
253         switch (event) {
254         default:
255                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
256                                   "Unsupported event [0x%x]\n", event));
257         case ACPI_AC_NOTIFY_STATUS:
258         case ACPI_NOTIFY_BUS_CHECK:
259         case ACPI_NOTIFY_DEVICE_CHECK:
260                 /*
261                  * A buggy BIOS may notify AC first and then sleep for
262                  * a specific time before doing actual operations in the
263                  * EC event handler (_Qxx). This will cause the AC state
264                  * reported by the ACPI event to be incorrect, so wait for a
265                  * specific time for the EC event handler to make progress.
266                  */
267                 if (ac_sleep_before_get_state_ms > 0)
268                         msleep(ac_sleep_before_get_state_ms);
269 
270                 acpi_ac_get_state(ac);
271                 acpi_bus_generate_netlink_event(device->pnp.device_class,
272                                                   dev_name(&device->dev), event,
273                                                   (u32) ac->state);
274                 acpi_notifier_call_chain(device, event, (u32) ac->state);
275                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
276         }
277 
278         return;
279 }
280 
281 static int acpi_ac_battery_notify(struct notifier_block *nb,
282                                   unsigned long action, void *data)
283 {
284         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
285         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
286 
287         /*
288          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
289          * when adapter is plugged/unplugged. However, battery status
290          * notifcations are triggered when battery starts charging or
291          * discharging. Re-reading AC status triggers lost AC notifications,
292          * if AC status has changed.
293          */
294         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
295             event->type == ACPI_BATTERY_NOTIFY_STATUS)
296                 acpi_ac_get_state(ac);
297 
298         return NOTIFY_OK;
299 }
300 
301 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
302 {
303         ac_sleep_before_get_state_ms = 1000;
304         return 0;
305 }
306 
307 static const struct dmi_system_id ac_dmi_table[] = {
308         {
309         .callback = thinkpad_e530_quirk,
310         .ident = "thinkpad e530",
311         .matches = {
312                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
313                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
314                 },
315         },
316         {},
317 };
318 
319 static int acpi_ac_add(struct acpi_device *device)
320 {
321         struct power_supply_config psy_cfg = {};
322         int result = 0;
323         struct acpi_ac *ac = NULL;
324 
325 
326         if (!device)
327                 return -EINVAL;
328 
329         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
330         if (!ac)
331                 return -ENOMEM;
332 
333         ac->device = device;
334         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
335         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
336         device->driver_data = ac;
337 
338         result = acpi_ac_get_state(ac);
339         if (result)
340                 goto end;
341 
342         psy_cfg.drv_data = ac;
343 
344         ac->charger_desc.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_desc.type = POWER_SUPPLY_TYPE_MAINS;
351         ac->charger_desc.properties = ac_props;
352         ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
353         ac->charger_desc.get_property = get_ac_property;
354         ac->charger = power_supply_register(&ac->device->dev,
355                                             &ac->charger_desc, &psy_cfg);
356         if (IS_ERR(ac->charger)) {
357                 result = PTR_ERR(ac->charger);
358                 goto end;
359         }
360 
361         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
362                acpi_device_name(device), acpi_device_bid(device),
363                ac->state ? "on-line" : "off-line");
364 
365         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
366         register_acpi_notifier(&ac->battery_nb);
367 end:
368         if (result) {
369 #ifdef CONFIG_ACPI_PROCFS_POWER
370                 acpi_ac_remove_fs(ac);
371 #endif
372                 kfree(ac);
373         }
374 
375         dmi_check_system(ac_dmi_table);
376         return result;
377 }
378 
379 #ifdef CONFIG_PM_SLEEP
380 static int acpi_ac_resume(struct device *dev)
381 {
382         struct acpi_ac *ac;
383         unsigned old_state;
384 
385         if (!dev)
386                 return -EINVAL;
387 
388         ac = acpi_driver_data(to_acpi_device(dev));
389         if (!ac)
390                 return -EINVAL;
391 
392         old_state = ac->state;
393         if (acpi_ac_get_state(ac))
394                 return 0;
395         if (old_state != ac->state)
396                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
397         return 0;
398 }
399 #else
400 #define acpi_ac_resume NULL
401 #endif
402 
403 static int acpi_ac_remove(struct acpi_device *device)
404 {
405         struct acpi_ac *ac = NULL;
406 
407 
408         if (!device || !acpi_driver_data(device))
409                 return -EINVAL;
410 
411         ac = acpi_driver_data(device);
412 
413         power_supply_unregister(ac->charger);
414         unregister_acpi_notifier(&ac->battery_nb);
415 
416 #ifdef CONFIG_ACPI_PROCFS_POWER
417         acpi_ac_remove_fs(ac);
418 #endif
419 
420         kfree(ac);
421 
422         return 0;
423 }
424 
425 static int __init acpi_ac_init(void)
426 {
427         int result;
428 
429         if (acpi_disabled)
430                 return -ENODEV;
431 
432 #ifdef CONFIG_ACPI_PROCFS_POWER
433         acpi_ac_dir = acpi_lock_ac_dir();
434         if (!acpi_ac_dir)
435                 return -ENODEV;
436 #endif
437 
438 
439         result = acpi_bus_register_driver(&acpi_ac_driver);
440         if (result < 0) {
441 #ifdef CONFIG_ACPI_PROCFS_POWER
442                 acpi_unlock_ac_dir(acpi_ac_dir);
443 #endif
444                 return -ENODEV;
445         }
446 
447         return 0;
448 }
449 
450 static void __exit acpi_ac_exit(void)
451 {
452         acpi_bus_unregister_driver(&acpi_ac_driver);
453 #ifdef CONFIG_ACPI_PROCFS_POWER
454         acpi_unlock_ac_dir(acpi_ac_dir);
455 #endif
456 }
457 module_init(acpi_ac_init);
458 module_exit(acpi_ac_exit);
459 

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