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Linux/drivers/acpi/button.c

  1 /*
  2  *  button.c - ACPI Button Driver
  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/init.h>
 25 #include <linux/types.h>
 26 #include <linux/proc_fs.h>
 27 #include <linux/seq_file.h>
 28 #include <linux/input.h>
 29 #include <linux/slab.h>
 30 #include <linux/acpi.h>
 31 #include <acpi/button.h>
 32 
 33 #define PREFIX "ACPI: "
 34 
 35 #define ACPI_BUTTON_CLASS               "button"
 36 #define ACPI_BUTTON_FILE_INFO           "info"
 37 #define ACPI_BUTTON_FILE_STATE          "state"
 38 #define ACPI_BUTTON_TYPE_UNKNOWN        0x00
 39 #define ACPI_BUTTON_NOTIFY_STATUS       0x80
 40 
 41 #define ACPI_BUTTON_SUBCLASS_POWER      "power"
 42 #define ACPI_BUTTON_HID_POWER           "PNP0C0C"
 43 #define ACPI_BUTTON_DEVICE_NAME_POWER   "Power Button"
 44 #define ACPI_BUTTON_TYPE_POWER          0x01
 45 
 46 #define ACPI_BUTTON_SUBCLASS_SLEEP      "sleep"
 47 #define ACPI_BUTTON_HID_SLEEP           "PNP0C0E"
 48 #define ACPI_BUTTON_DEVICE_NAME_SLEEP   "Sleep Button"
 49 #define ACPI_BUTTON_TYPE_SLEEP          0x03
 50 
 51 #define ACPI_BUTTON_SUBCLASS_LID        "lid"
 52 #define ACPI_BUTTON_HID_LID             "PNP0C0D"
 53 #define ACPI_BUTTON_DEVICE_NAME_LID     "Lid Switch"
 54 #define ACPI_BUTTON_TYPE_LID            0x05
 55 
 56 #define ACPI_BUTTON_LID_INIT_IGNORE     0x00
 57 #define ACPI_BUTTON_LID_INIT_OPEN       0x01
 58 #define ACPI_BUTTON_LID_INIT_METHOD     0x02
 59 
 60 #define _COMPONENT              ACPI_BUTTON_COMPONENT
 61 ACPI_MODULE_NAME("button");
 62 
 63 MODULE_AUTHOR("Paul Diefenbaugh");
 64 MODULE_DESCRIPTION("ACPI Button Driver");
 65 MODULE_LICENSE("GPL");
 66 
 67 static const struct acpi_device_id button_device_ids[] = {
 68         {ACPI_BUTTON_HID_LID,    0},
 69         {ACPI_BUTTON_HID_SLEEP,  0},
 70         {ACPI_BUTTON_HID_SLEEPF, 0},
 71         {ACPI_BUTTON_HID_POWER,  0},
 72         {ACPI_BUTTON_HID_POWERF, 0},
 73         {"", 0},
 74 };
 75 MODULE_DEVICE_TABLE(acpi, button_device_ids);
 76 
 77 static int acpi_button_add(struct acpi_device *device);
 78 static int acpi_button_remove(struct acpi_device *device);
 79 static void acpi_button_notify(struct acpi_device *device, u32 event);
 80 
 81 #ifdef CONFIG_PM_SLEEP
 82 static int acpi_button_suspend(struct device *dev);
 83 static int acpi_button_resume(struct device *dev);
 84 #else
 85 #define acpi_button_suspend NULL
 86 #define acpi_button_resume NULL
 87 #endif
 88 static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume);
 89 
 90 static struct acpi_driver acpi_button_driver = {
 91         .name = "button",
 92         .class = ACPI_BUTTON_CLASS,
 93         .ids = button_device_ids,
 94         .ops = {
 95                 .add = acpi_button_add,
 96                 .remove = acpi_button_remove,
 97                 .notify = acpi_button_notify,
 98         },
 99         .drv.pm = &acpi_button_pm,
100 };
101 
102 struct acpi_button {
103         unsigned int type;
104         struct input_dev *input;
105         char phys[32];                  /* for input device */
106         unsigned long pushed;
107         bool suspended;
108 };
109 
110 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
111 static struct acpi_device *lid_device;
112 static u8 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
113 
114 /* --------------------------------------------------------------------------
115                               FS Interface (/proc)
116    -------------------------------------------------------------------------- */
117 
118 static struct proc_dir_entry *acpi_button_dir;
119 static struct proc_dir_entry *acpi_lid_dir;
120 
121 static int acpi_lid_evaluate_state(struct acpi_device *device)
122 {
123         unsigned long long lid_state;
124         acpi_status status;
125 
126         status = acpi_evaluate_integer(device->handle, "_LID", NULL, &lid_state);
127         if (ACPI_FAILURE(status))
128                 return -ENODEV;
129 
130         return lid_state ? 1 : 0;
131 }
132 
133 static int acpi_lid_notify_state(struct acpi_device *device, int state)
134 {
135         struct acpi_button *button = acpi_driver_data(device);
136         int ret;
137 
138         /* input layer checks if event is redundant */
139         input_report_switch(button->input, SW_LID, !state);
140         input_sync(button->input);
141 
142         if (state)
143                 pm_wakeup_event(&device->dev, 0);
144 
145         ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
146         if (ret == NOTIFY_DONE)
147                 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
148                                                    device);
149         if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
150                 /*
151                  * It is also regarded as success if the notifier_chain
152                  * returns NOTIFY_OK or NOTIFY_DONE.
153                  */
154                 ret = 0;
155         }
156         return ret;
157 }
158 
159 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
160 {
161         struct acpi_device *device = seq->private;
162         int state;
163 
164         state = acpi_lid_evaluate_state(device);
165         seq_printf(seq, "state:      %s\n",
166                    state < 0 ? "unsupported" : (state ? "open" : "closed"));
167         return 0;
168 }
169 
170 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
171 {
172         return single_open(file, acpi_button_state_seq_show, PDE_DATA(inode));
173 }
174 
175 static const struct file_operations acpi_button_state_fops = {
176         .owner = THIS_MODULE,
177         .open = acpi_button_state_open_fs,
178         .read = seq_read,
179         .llseek = seq_lseek,
180         .release = single_release,
181 };
182 
183 static int acpi_button_add_fs(struct acpi_device *device)
184 {
185         struct acpi_button *button = acpi_driver_data(device);
186         struct proc_dir_entry *entry = NULL;
187         int ret = 0;
188 
189         /* procfs I/F for ACPI lid device only */
190         if (button->type != ACPI_BUTTON_TYPE_LID)
191                 return 0;
192 
193         if (acpi_button_dir || acpi_lid_dir) {
194                 printk(KERN_ERR PREFIX "More than one Lid device found!\n");
195                 return -EEXIST;
196         }
197 
198         /* create /proc/acpi/button */
199         acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
200         if (!acpi_button_dir)
201                 return -ENODEV;
202 
203         /* create /proc/acpi/button/lid */
204         acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
205         if (!acpi_lid_dir) {
206                 ret = -ENODEV;
207                 goto remove_button_dir;
208         }
209 
210         /* create /proc/acpi/button/lid/LID/ */
211         acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
212         if (!acpi_device_dir(device)) {
213                 ret = -ENODEV;
214                 goto remove_lid_dir;
215         }
216 
217         /* create /proc/acpi/button/lid/LID/state */
218         entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
219                                  S_IRUGO, acpi_device_dir(device),
220                                  &acpi_button_state_fops, device);
221         if (!entry) {
222                 ret = -ENODEV;
223                 goto remove_dev_dir;
224         }
225 
226 done:
227         return ret;
228 
229 remove_dev_dir:
230         remove_proc_entry(acpi_device_bid(device),
231                           acpi_lid_dir);
232         acpi_device_dir(device) = NULL;
233 remove_lid_dir:
234         remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
235         acpi_lid_dir = NULL;
236 remove_button_dir:
237         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
238         acpi_button_dir = NULL;
239         goto done;
240 }
241 
242 static int acpi_button_remove_fs(struct acpi_device *device)
243 {
244         struct acpi_button *button = acpi_driver_data(device);
245 
246         if (button->type != ACPI_BUTTON_TYPE_LID)
247                 return 0;
248 
249         remove_proc_entry(ACPI_BUTTON_FILE_STATE,
250                           acpi_device_dir(device));
251         remove_proc_entry(acpi_device_bid(device),
252                           acpi_lid_dir);
253         acpi_device_dir(device) = NULL;
254         remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
255         acpi_lid_dir = NULL;
256         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
257         acpi_button_dir = NULL;
258 
259         return 0;
260 }
261 
262 /* --------------------------------------------------------------------------
263                                 Driver Interface
264    -------------------------------------------------------------------------- */
265 int acpi_lid_notifier_register(struct notifier_block *nb)
266 {
267         return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
268 }
269 EXPORT_SYMBOL(acpi_lid_notifier_register);
270 
271 int acpi_lid_notifier_unregister(struct notifier_block *nb)
272 {
273         return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
274 }
275 EXPORT_SYMBOL(acpi_lid_notifier_unregister);
276 
277 int acpi_lid_open(void)
278 {
279         if (!lid_device)
280                 return -ENODEV;
281 
282         return acpi_lid_evaluate_state(lid_device);
283 }
284 EXPORT_SYMBOL(acpi_lid_open);
285 
286 static int acpi_lid_update_state(struct acpi_device *device)
287 {
288         int state;
289 
290         state = acpi_lid_evaluate_state(device);
291         if (state < 0)
292                 return state;
293 
294         return acpi_lid_notify_state(device, state);
295 }
296 
297 static void acpi_lid_initialize_state(struct acpi_device *device)
298 {
299         switch (lid_init_state) {
300         case ACPI_BUTTON_LID_INIT_OPEN:
301                 (void)acpi_lid_notify_state(device, 1);
302                 break;
303         case ACPI_BUTTON_LID_INIT_METHOD:
304                 (void)acpi_lid_update_state(device);
305                 break;
306         case ACPI_BUTTON_LID_INIT_IGNORE:
307         default:
308                 break;
309         }
310 }
311 
312 static void acpi_button_notify(struct acpi_device *device, u32 event)
313 {
314         struct acpi_button *button = acpi_driver_data(device);
315         struct input_dev *input;
316 
317         switch (event) {
318         case ACPI_FIXED_HARDWARE_EVENT:
319                 event = ACPI_BUTTON_NOTIFY_STATUS;
320                 /* fall through */
321         case ACPI_BUTTON_NOTIFY_STATUS:
322                 input = button->input;
323                 if (button->type == ACPI_BUTTON_TYPE_LID) {
324                         acpi_lid_update_state(device);
325                 } else {
326                         int keycode;
327 
328                         pm_wakeup_event(&device->dev, 0);
329                         if (button->suspended)
330                                 break;
331 
332                         keycode = test_bit(KEY_SLEEP, input->keybit) ?
333                                                 KEY_SLEEP : KEY_POWER;
334                         input_report_key(input, keycode, 1);
335                         input_sync(input);
336                         input_report_key(input, keycode, 0);
337                         input_sync(input);
338 
339                         acpi_bus_generate_netlink_event(
340                                         device->pnp.device_class,
341                                         dev_name(&device->dev),
342                                         event, ++button->pushed);
343                 }
344                 break;
345         default:
346                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
347                                   "Unsupported event [0x%x]\n", event));
348                 break;
349         }
350 }
351 
352 #ifdef CONFIG_PM_SLEEP
353 static int acpi_button_suspend(struct device *dev)
354 {
355         struct acpi_device *device = to_acpi_device(dev);
356         struct acpi_button *button = acpi_driver_data(device);
357 
358         button->suspended = true;
359         return 0;
360 }
361 
362 static int acpi_button_resume(struct device *dev)
363 {
364         struct acpi_device *device = to_acpi_device(dev);
365         struct acpi_button *button = acpi_driver_data(device);
366 
367         button->suspended = false;
368         if (button->type == ACPI_BUTTON_TYPE_LID)
369                 acpi_lid_initialize_state(device);
370         return 0;
371 }
372 #endif
373 
374 static int acpi_button_add(struct acpi_device *device)
375 {
376         struct acpi_button *button;
377         struct input_dev *input;
378         const char *hid = acpi_device_hid(device);
379         char *name, *class;
380         int error;
381 
382         button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
383         if (!button)
384                 return -ENOMEM;
385 
386         device->driver_data = button;
387 
388         button->input = input = input_allocate_device();
389         if (!input) {
390                 error = -ENOMEM;
391                 goto err_free_button;
392         }
393 
394         name = acpi_device_name(device);
395         class = acpi_device_class(device);
396 
397         if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
398             !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
399                 button->type = ACPI_BUTTON_TYPE_POWER;
400                 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
401                 sprintf(class, "%s/%s",
402                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
403         } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
404                    !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
405                 button->type = ACPI_BUTTON_TYPE_SLEEP;
406                 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
407                 sprintf(class, "%s/%s",
408                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
409         } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
410                 button->type = ACPI_BUTTON_TYPE_LID;
411                 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
412                 sprintf(class, "%s/%s",
413                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
414         } else {
415                 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
416                 error = -ENODEV;
417                 goto err_free_input;
418         }
419 
420         error = acpi_button_add_fs(device);
421         if (error)
422                 goto err_free_input;
423 
424         snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
425 
426         input->name = name;
427         input->phys = button->phys;
428         input->id.bustype = BUS_HOST;
429         input->id.product = button->type;
430         input->dev.parent = &device->dev;
431 
432         switch (button->type) {
433         case ACPI_BUTTON_TYPE_POWER:
434                 input_set_capability(input, EV_KEY, KEY_POWER);
435                 break;
436 
437         case ACPI_BUTTON_TYPE_SLEEP:
438                 input_set_capability(input, EV_KEY, KEY_SLEEP);
439                 break;
440 
441         case ACPI_BUTTON_TYPE_LID:
442                 input_set_capability(input, EV_SW, SW_LID);
443                 break;
444         }
445 
446         error = input_register_device(input);
447         if (error)
448                 goto err_remove_fs;
449         if (button->type == ACPI_BUTTON_TYPE_LID) {
450                 acpi_lid_initialize_state(device);
451                 /*
452                  * This assumes there's only one lid device, or if there are
453                  * more we only care about the last one...
454                  */
455                 lid_device = device;
456         }
457 
458         printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
459         return 0;
460 
461  err_remove_fs:
462         acpi_button_remove_fs(device);
463  err_free_input:
464         input_free_device(input);
465  err_free_button:
466         kfree(button);
467         return error;
468 }
469 
470 static int acpi_button_remove(struct acpi_device *device)
471 {
472         struct acpi_button *button = acpi_driver_data(device);
473 
474         acpi_button_remove_fs(device);
475         input_unregister_device(button->input);
476         kfree(button);
477         return 0;
478 }
479 
480 static int param_set_lid_init_state(const char *val, struct kernel_param *kp)
481 {
482         int result = 0;
483 
484         if (!strncmp(val, "open", sizeof("open") - 1)) {
485                 lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;
486                 pr_info("Notify initial lid state as open\n");
487         } else if (!strncmp(val, "method", sizeof("method") - 1)) {
488                 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
489                 pr_info("Notify initial lid state with _LID return value\n");
490         } else if (!strncmp(val, "ignore", sizeof("ignore") - 1)) {
491                 lid_init_state = ACPI_BUTTON_LID_INIT_IGNORE;
492                 pr_info("Do not notify initial lid state\n");
493         } else
494                 result = -EINVAL;
495         return result;
496 }
497 
498 static int param_get_lid_init_state(char *buffer, struct kernel_param *kp)
499 {
500         switch (lid_init_state) {
501         case ACPI_BUTTON_LID_INIT_OPEN:
502                 return sprintf(buffer, "open");
503         case ACPI_BUTTON_LID_INIT_METHOD:
504                 return sprintf(buffer, "method");
505         case ACPI_BUTTON_LID_INIT_IGNORE:
506                 return sprintf(buffer, "ignore");
507         default:
508                 return sprintf(buffer, "invalid");
509         }
510         return 0;
511 }
512 
513 module_param_call(lid_init_state,
514                   param_set_lid_init_state, param_get_lid_init_state,
515                   NULL, 0644);
516 MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state");
517 
518 module_acpi_driver(acpi_button_driver);
519 

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