drivers/acpi/hotkey.c

   1 /*
   2  *  hotkey.c - ACPI Hotkey Driver ($Revision: 0.2 $)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/types.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/sched.h>
  30 #include <linux/kmod.h>
  31 #include <linux/seq_file.h>
  32 #include <acpi/acpi_drivers.h>
  33 #include <acpi/acpi_bus.h>
  34 #include <asm/uaccess.h>
  35
  36 #define HOTKEY_ACPI_VERSION "0.1"
  37
  38 #define HOTKEY_PROC "hotkey"
  39 #define HOTKEY_EV_CONFIG    "event_config"
  40 #define HOTKEY_PL_CONFIG    "poll_config"
  41 #define HOTKEY_ACTION   "action"
  42 #define HOTKEY_INFO "info"
  43
  44 #define ACPI_HOTK_NAME          "Generic Hotkey Driver"
  45 #define ACPI_HOTK_CLASS         "Hotkey"
  46 #define ACPI_HOTK_DEVICE_NAME   "Hotkey"
  47 #define ACPI_HOTK_HID           "Unknown?"
  48 #define ACPI_HOTKEY_COMPONENT   0x20000000
  49
  50 #define ACPI_HOTKEY_EVENT   0x1
  51 #define ACPI_HOTKEY_POLLING 0x2
  52 #define ACPI_UNDEFINED_EVENT    0xf
  53
  54 #define RESULT_STR_LEN      80
  55
  56 #define ACTION_METHOD   0
  57 #define POLL_METHOD     1
  58
  59 #define IS_EVENT(e)             ((e) <= 10000 && (e) >0)
  60 #define IS_POLL(e)              ((e) > 10000)
  61 #define IS_OTHERS(e)            ((e)<=0 || (e)>=20000)
  62 #define _COMPONENT              ACPI_HOTKEY_COMPONENT
  63 ACPI_MODULE_NAME("acpi_hotkey")
  64
  65     MODULE_AUTHOR("luming.yu@intel.com");
  66 MODULE_DESCRIPTION(ACPI_HOTK_NAME);
  67 MODULE_LICENSE("GPL");
  68
  69 /*  standardized internal hotkey number/event  */
  70 enum {
  71         /* Video Extension event */
  72         HK_EVENT_CYCLE_OUTPUT_DEVICE = 0x80,
  73         HK_EVENT_OUTPUT_DEVICE_STATUS_CHANGE,
  74         HK_EVENT_CYCLE_DISPLAY_OUTPUT,
  75         HK_EVENT_NEXT_DISPLAY_OUTPUT,
  76         HK_EVENT_PREVIOUS_DISPLAY_OUTPUT,
  77         HK_EVENT_CYCLE_BRIGHTNESS,
  78         HK_EVENT_INCREASE_BRIGHTNESS,
  79         HK_EVENT_DECREASE_BRIGHTNESS,
  80         HK_EVENT_ZERO_BRIGHTNESS,
  81         HK_EVENT_DISPLAY_DEVICE_OFF,
  82
  83         /* Snd Card event */
  84         HK_EVENT_VOLUME_MUTE,
  85         HK_EVENT_VOLUME_INCLREASE,
  86         HK_EVENT_VOLUME_DECREASE,
  87
  88         /* running state control */
  89         HK_EVENT_ENTERRING_S3,
  90         HK_EVENT_ENTERRING_S4,
  91         HK_EVENT_ENTERRING_S5,
  92 };
  93
  94 /*  procdir we use */
  95 static struct proc_dir_entry *hotkey_proc_dir;
  96 static struct proc_dir_entry *hotkey_config;
  97 static struct proc_dir_entry *hotkey_poll_config;
  98 static struct proc_dir_entry *hotkey_action;
  99 static struct proc_dir_entry *hotkey_info;
 100
 101 /* linkage for all type of hotkey */
 102 struct acpi_hotkey_link {
 103         struct list_head entries;
 104         int hotkey_type;        /* event or polling based hotkey  */
 105         int hotkey_standard_num;        /* standardized hotkey(event) number */
 106 };
 107
 108 /* event based hotkey */
 109 struct acpi_event_hotkey {
 110         struct acpi_hotkey_link hotkey_link;
 111         int flag;
 112         acpi_handle bus_handle; /* bus to install notify handler */
 113         int external_hotkey_num;        /* external hotkey/event number */
 114         acpi_handle action_handle;      /* acpi handle attached aml action method */
 115         char *action_method;    /* action method */
 116 };
 117
 118 /*
 119  * There are two ways to poll status
 120  * 1. directy call read_xxx method, without any arguments passed in
 121  * 2. call write_xxx method, with arguments passed in, you need
 122  * the result is saved in acpi_polling_hotkey.poll_result.
 123  * anthoer read command through polling interface.
 124  *
 125  */
 126
 127 /* polling based hotkey */
 128 struct acpi_polling_hotkey {
 129         struct acpi_hotkey_link hotkey_link;
 130         int flag;
 131         acpi_handle poll_handle;        /* acpi handle attached polling method */
 132         char *poll_method;      /* poll method */
 133         acpi_handle action_handle;      /* acpi handle attached action method */
 134         char *action_method;    /* action method */
 135         union acpi_object *poll_result; /* polling_result */
 136         struct proc_dir_entry *proc;
 137 };
 138
 139 /* hotkey object union */
 140 union acpi_hotkey {
 141         struct list_head entries;
 142         struct acpi_hotkey_link link;
 143         struct acpi_event_hotkey event_hotkey;
 144         struct acpi_polling_hotkey poll_hotkey;
 145 };
 146
 147 /* hotkey object list */
 148 struct acpi_hotkey_list {
 149         struct list_head *entries;
 150         int count;
 151 };
 152
 153 static int auto_hotkey_add(struct acpi_device *device);
 154 static int auto_hotkey_remove(struct acpi_device *device, int type);
 155
 156 static struct acpi_driver hotkey_driver = {
 157         .name = ACPI_HOTK_NAME,
 158         .class = ACPI_HOTK_CLASS,
 159         .ids = ACPI_HOTK_HID,
 160         .ops = {
 161                 .add = auto_hotkey_add,
 162                 .remove = auto_hotkey_remove,
 163                 },
 164 };
 165
 166 static void free_hotkey_device(union acpi_hotkey *key);
 167 static void free_hotkey_buffer(union acpi_hotkey *key);
 168 static void free_poll_hotkey_buffer(union acpi_hotkey *key);
 169 static int hotkey_open_config(struct inode *inode, struct file *file);
 170 static int hotkey_poll_open_config(struct inode *inode, struct file *file);
 171 static ssize_t hotkey_write_config(struct file *file,
 172                                    const char __user * buffer,
 173                                    size_t count, loff_t * data);
 174 static int hotkey_info_open_fs(struct inode *inode, struct file *file);
 175 static int hotkey_action_open_fs(struct inode *inode, struct file *file);
 176 static ssize_t hotkey_execute_aml_method(struct file *file,
 177                                          const char __user * buffer,
 178                                          size_t count, loff_t * data);
 179 static int hotkey_config_seq_show(struct seq_file *seq, void *offset);
 180 static int hotkey_poll_config_seq_show(struct seq_file *seq, void *offset);
 181 static int hotkey_polling_open_fs(struct inode *inode, struct file *file);
 182 static union acpi_hotkey *get_hotkey_by_event(struct
 183                                               acpi_hotkey_list
 184                                               *hotkey_list, int event);
 185
 186 /* event based config */
 187 static struct file_operations hotkey_config_fops = {
 188         .open = hotkey_open_config,
 189         .read = seq_read,
 190         .write = hotkey_write_config,
 191         .llseek = seq_lseek,
 192         .release = single_release,
 193 };
 194
 195 /* polling based config */
 196 static struct file_operations hotkey_poll_config_fops = {
 197         .open = hotkey_poll_open_config,
 198         .read = seq_read,
 199         .write = hotkey_write_config,
 200         .llseek = seq_lseek,
 201         .release = single_release,
 202 };
 203
 204 /* hotkey driver info */
 205 static struct file_operations hotkey_info_fops = {
 206         .open = hotkey_info_open_fs,
 207         .read = seq_read,
 208         .llseek = seq_lseek,
 209         .release = single_release,
 210 };
 211
 212 /* action */
 213 static struct file_operations hotkey_action_fops = {
 214         .open = hotkey_action_open_fs,
 215         .read = seq_read,
 216         .write = hotkey_execute_aml_method,
 217         .llseek = seq_lseek,
 218         .release = single_release,
 219 };
 220
 221 /* polling results */
 222 static struct file_operations hotkey_polling_fops = {
 223         .open = hotkey_polling_open_fs,
 224         .read = seq_read,
 225         .llseek = seq_lseek,
 226         .release = single_release,
 227 };
 228
 229 struct acpi_hotkey_list global_hotkey_list;     /* link all ev or pl hotkey  */
 230 struct list_head hotkey_entries;        /* head of the list of hotkey_list */
 231
 232 static int hotkey_info_seq_show(struct seq_file *seq, void *offset)
 233 {
 234         ACPI_FUNCTION_TRACE("hotkey_info_seq_show");
 235
 236         seq_printf(seq, "Hotkey generic driver ver: %s\n", HOTKEY_ACPI_VERSION);
 237
 238         return_VALUE(0);
 239 }
 240
 241 static int hotkey_info_open_fs(struct inode *inode, struct file *file)
 242 {
 243         return single_open(file, hotkey_info_seq_show, PDE(inode)->data);
 244 }
 245
 246 static char *format_result(union acpi_object *object)
 247 {
 248         char *buf = NULL;
 249
 250         buf = (char *)kmalloc(RESULT_STR_LEN, GFP_KERNEL);
 251         if (buf)
 252                 memset(buf, 0, RESULT_STR_LEN);
 253         else
 254                 goto do_fail;
 255
 256         /* Now, just support integer type */
 257         if (object->type == ACPI_TYPE_INTEGER)
 258                 sprintf(buf, "%d\n", (u32) object->integer.value);
 259       do_fail:
 260         return (buf);
 261 }
 262
 263 static int hotkey_polling_seq_show(struct seq_file *seq, void *offset)
 264 {
 265         struct acpi_polling_hotkey *poll_hotkey =
 266             (struct acpi_polling_hotkey *)seq->private;
 267         char *buf;
 268
 269         ACPI_FUNCTION_TRACE("hotkey_polling_seq_show");
 270
 271         if (poll_hotkey->poll_result) {
 272                 buf = format_result(poll_hotkey->poll_result);
 273                 if (buf)
 274                         seq_printf(seq, "%s", buf);
 275                 kfree(buf);
 276         }
 277         return_VALUE(0);
 278 }
 279
 280 static int hotkey_polling_open_fs(struct inode *inode, struct file *file)
 281 {
 282         return single_open(file, hotkey_polling_seq_show, PDE(inode)->data);
 283 }
 284
 285 static int hotkey_action_open_fs(struct inode *inode, struct file *file)
 286 {
 287         return single_open(file, hotkey_info_seq_show, PDE(inode)->data);
 288 }
 289
 290 /* Mapping external hotkey number to standardized hotkey event num */
 291 static int hotkey_get_internal_event(int event, struct acpi_hotkey_list *list)
 292 {
 293         struct list_head *entries;
 294         int val = -1;
 295
 296         ACPI_FUNCTION_TRACE("hotkey_get_internal_event");
 297
 298         list_for_each(entries, list->entries) {
 299                 union acpi_hotkey *key =
 300                     container_of(entries, union acpi_hotkey, entries);
 301                 if (key->link.hotkey_type == ACPI_HOTKEY_EVENT
 302                     && key->event_hotkey.external_hotkey_num == event) {
 303                         val = key->link.hotkey_standard_num;
 304                         break;
 305                 }
 306         }
 307
 308         return_VALUE(val);
 309 }
 310
 311 static void
 312 acpi_hotkey_notify_handler(acpi_handle handle, u32 event, void *data)
 313 {
 314         struct acpi_device *device = NULL;
 315         u32 internal_event;
 316
 317         ACPI_FUNCTION_TRACE("acpi_hotkey_notify_handler");
 318
 319         if (acpi_bus_get_device(handle, &device))
 320                 return_VOID;
 321
 322         internal_event = hotkey_get_internal_event(event, &global_hotkey_list);
 323         acpi_bus_generate_event(device, internal_event, 0);
 324
 325         return_VOID;
 326 }
 327
 328 /* Need to invent automatically hotkey add method */
 329 static int auto_hotkey_add(struct acpi_device *device)
 330 {
 331         /* Implement me */
 332         return 0;
 333 }
 334
 335 /* Need to invent automatically hotkey remove method */
 336 static int auto_hotkey_remove(struct acpi_device *device, int type)
 337 {
 338         /* Implement me */
 339         return 0;
 340 }
 341
 342 /* Create a proc file for each polling method */
 343 static int create_polling_proc(union acpi_hotkey *device)
 344 {
 345         struct proc_dir_entry *proc;
 346         char proc_name[80];
 347         mode_t mode;
 348
 349         ACPI_FUNCTION_TRACE("create_polling_proc");
 350         mode = S_IFREG | S_IRUGO | S_IWUGO;
 351
 352         sprintf(proc_name, "%d", device->link.hotkey_standard_num);
 353         /*
 354            strcat(proc_name, device->poll_hotkey.poll_method);
 355          */
 356         proc = create_proc_entry(proc_name, mode, hotkey_proc_dir);
 357
 358         if (!proc) {
 359                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 360                                   "Hotkey: Unable to create %s entry\n",
 361                                   device->poll_hotkey.poll_method));
 362                 return_VALUE(-ENODEV);
 363         } else {
 364                 proc->proc_fops = &hotkey_polling_fops;
 365                 proc->owner = THIS_MODULE;
 366                 proc->data = device;
 367                 proc->uid = 0;
 368                 proc->gid = 0;
 369                 device->poll_hotkey.proc = proc;
 370         }
 371         return_VALUE(0);
 372 }
 373
 374 static int hotkey_add(union acpi_hotkey *device)
 375 {
 376         int status = 0;
 377         struct acpi_device *dev = NULL;
 378
 379         ACPI_FUNCTION_TRACE("hotkey_add");
 380
 381         if (device->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 382                 acpi_bus_get_device(device->event_hotkey.bus_handle, &dev);
 383                 status = acpi_install_notify_handler(dev->handle,
 384                                                      ACPI_DEVICE_NOTIFY,
 385                                                      acpi_hotkey_notify_handler,
 386                                                      dev);
 387         } else                  /* Add polling hotkey */
 388                 create_polling_proc(device);
 389
 390         global_hotkey_list.count++;
 391
 392         list_add_tail(&device->link.entries, global_hotkey_list.entries);
 393
 394         return_VALUE(status);
 395 }
 396
 397 static int hotkey_remove(union acpi_hotkey *device)
 398 {
 399         struct list_head *entries, *next;
 400
 401         ACPI_FUNCTION_TRACE("hotkey_remove");
 402
 403         list_for_each_safe(entries, next, global_hotkey_list.entries) {
 404                 union acpi_hotkey *key =
 405                     container_of(entries, union acpi_hotkey, entries);
 406                 if (key->link.hotkey_standard_num ==
 407                     device->link.hotkey_standard_num) {
 408                         list_del(&key->link.entries);
 409                         free_hotkey_device(key);
 410                         global_hotkey_list.count--;
 411                         break;
 412                 }
 413         }
 414         kfree(device);
 415         return_VALUE(0);
 416 }
 417
 418 static int hotkey_update(union acpi_hotkey *key)
 419 {
 420         struct list_head *entries;
 421
 422         ACPI_FUNCTION_TRACE("hotkey_update");
 423
 424         list_for_each(entries, global_hotkey_list.entries) {
 425                 union acpi_hotkey *tmp =
 426                     container_of(entries, union acpi_hotkey, entries);
 427                 if (tmp->link.hotkey_standard_num ==
 428                     key->link.hotkey_standard_num) {
 429                         if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 430                                 free_hotkey_buffer(tmp);
 431                                 tmp->event_hotkey.bus_handle =
 432                                     key->event_hotkey.bus_handle;
 433                                 tmp->event_hotkey.external_hotkey_num =
 434                                     key->event_hotkey.external_hotkey_num;
 435                                 tmp->event_hotkey.action_handle =
 436                                     key->event_hotkey.action_handle;
 437                                 tmp->event_hotkey.action_method =
 438                                     key->event_hotkey.action_method;
 439                                 kfree(key);
 440                         } else {
 441                                 /*
 442                                    char  proc_name[80];
 443
 444                                    sprintf(proc_name, "%d", tmp->link.hotkey_standard_num);
 445                                    strcat(proc_name, tmp->poll_hotkey.poll_method);
 446                                    remove_proc_entry(proc_name,hotkey_proc_dir);
 447                                  */
 448                                 free_poll_hotkey_buffer(tmp);
 449                                 tmp->poll_hotkey.poll_handle =
 450                                     key->poll_hotkey.poll_handle;
 451                                 tmp->poll_hotkey.poll_method =
 452                                     key->poll_hotkey.poll_method;
 453                                 tmp->poll_hotkey.action_handle =
 454                                     key->poll_hotkey.action_handle;
 455                                 tmp->poll_hotkey.action_method =
 456                                     key->poll_hotkey.action_method;
 457                                 tmp->poll_hotkey.poll_result =
 458                                     key->poll_hotkey.poll_result;
 459                                 /*
 460                                    create_polling_proc(tmp);
 461                                  */
 462                                 kfree(key);
 463                         }
 464                         return_VALUE(0);
 465                         break;
 466                 }
 467         }
 468
 469         return_VALUE(-ENODEV);
 470 }
 471
 472 static void free_hotkey_device(union acpi_hotkey *key)
 473 {
 474         struct acpi_device *dev;
 475
 476         ACPI_FUNCTION_TRACE("free_hotkey_device");
 477
 478         if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 479                 acpi_bus_get_device(key->event_hotkey.bus_handle, &dev);
 480                 if (dev->handle)
 481                         acpi_remove_notify_handler(dev->handle,
 482                                                    ACPI_DEVICE_NOTIFY,
 483                                                    acpi_hotkey_notify_handler);
 484                 free_hotkey_buffer(key);
 485         } else {
 486                 char proc_name[80];
 487
 488                 sprintf(proc_name, "%d", key->link.hotkey_standard_num);
 489                 /*
 490                    strcat(proc_name, key->poll_hotkey.poll_method);
 491                  */
 492                 remove_proc_entry(proc_name, hotkey_proc_dir);
 493                 free_poll_hotkey_buffer(key);
 494         }
 495         kfree(key);
 496         return_VOID;
 497 }
 498
 499 static void free_hotkey_buffer(union acpi_hotkey *key)
 500 {
 501         kfree(key->event_hotkey.action_method);
 502 }
 503
 504 static void free_poll_hotkey_buffer(union acpi_hotkey *key)
 505 {
 506         kfree(key->poll_hotkey.action_method);
 507         kfree(key->poll_hotkey.poll_method);
 508         kfree(key->poll_hotkey.poll_result);
 509 }
 510 static int
 511 init_hotkey_device(union acpi_hotkey *key, char *bus_str, char *action_str,
 512                    char *method, int std_num, int external_num)
 513 {
 514         acpi_handle tmp_handle;
 515         acpi_status status = AE_OK;
 516
 517         ACPI_FUNCTION_TRACE("init_hotkey_device");
 518
 519         if (std_num < 0 || IS_POLL(std_num) || !key)
 520                 goto do_fail;
 521
 522         if (!bus_str || !action_str || !method)
 523                 goto do_fail;
 524
 525         key->link.hotkey_type = ACPI_HOTKEY_EVENT;
 526         key->link.hotkey_standard_num = std_num;
 527         key->event_hotkey.flag = 0;
 528         key->event_hotkey.action_method = method;
 529
 530         status =
 531             acpi_get_handle(NULL, bus_str, &(key->event_hotkey.bus_handle));
 532         if (ACPI_FAILURE(status))
 533                 goto do_fail;
 534         key->event_hotkey.external_hotkey_num = external_num;
 535         status =
 536             acpi_get_handle(NULL, action_str,
 537                             &(key->event_hotkey.action_handle));
 538         if (ACPI_FAILURE(status))
 539                 goto do_fail;
 540         status = acpi_get_handle(key->event_hotkey.action_handle,
 541                                  method, &tmp_handle);
 542         if (ACPI_FAILURE(status))
 543                 goto do_fail;
 544         return_VALUE(AE_OK);
 545       do_fail:
 546         return_VALUE(-ENODEV);
 547 }
 548
 549 static int
 550 init_poll_hotkey_device(union acpi_hotkey *key,
 551                         char *poll_str,
 552                         char *poll_method,
 553                         char *action_str, char *action_method, int std_num)
 554 {
 555         acpi_status status = AE_OK;
 556         acpi_handle tmp_handle;
 557
 558         ACPI_FUNCTION_TRACE("init_poll_hotkey_device");
 559
 560         if (std_num < 0 || IS_EVENT(std_num) || !key)
 561                 goto do_fail;
 562
 563         if (!poll_str || !poll_method || !action_str || !action_method)
 564                 goto do_fail;
 565
 566         key->link.hotkey_type = ACPI_HOTKEY_POLLING;
 567         key->link.hotkey_standard_num = std_num;
 568         key->poll_hotkey.flag = 0;
 569         key->poll_hotkey.poll_method = poll_method;
 570         key->poll_hotkey.action_method = action_method;
 571
 572         status =
 573             acpi_get_handle(NULL, poll_str, &(key->poll_hotkey.poll_handle));
 574         if (ACPI_FAILURE(status))
 575                 goto do_fail;
 576         status = acpi_get_handle(key->poll_hotkey.poll_handle,
 577                                  poll_method, &tmp_handle);
 578         if (ACPI_FAILURE(status))
 579                 goto do_fail;
 580         status =
 581             acpi_get_handle(NULL, action_str,
 582                             &(key->poll_hotkey.action_handle));
 583         if (ACPI_FAILURE(status))
 584                 goto do_fail;
 585         status = acpi_get_handle(key->poll_hotkey.action_handle,
 586                                  action_method, &tmp_handle);
 587         if (ACPI_FAILURE(status))
 588                 goto do_fail;
 589         key->poll_hotkey.poll_result =
 590             (union acpi_object *)kmalloc(sizeof(union acpi_object), GFP_KERNEL);
 591         if (!key->poll_hotkey.poll_result)
 592                 goto do_fail;
 593         return_VALUE(AE_OK);
 594       do_fail:
 595         return_VALUE(-ENODEV);
 596 }
 597
 598 static int hotkey_open_config(struct inode *inode, struct file *file)
 599 {
 600         ACPI_FUNCTION_TRACE("hotkey_open_config");
 601         return_VALUE(single_open
 602                      (file, hotkey_config_seq_show, PDE(inode)->data));
 603 }
 604
 605 static int hotkey_poll_open_config(struct inode *inode, struct file *file)
 606 {
 607         ACPI_FUNCTION_TRACE("hotkey_poll_open_config");
 608         return_VALUE(single_open
 609                      (file, hotkey_poll_config_seq_show, PDE(inode)->data));
 610 }
 611
 612 static int hotkey_config_seq_show(struct seq_file *seq, void *offset)
 613 {
 614         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
 615         struct list_head *entries;
 616         char bus_name[ACPI_PATHNAME_MAX] = { 0 };
 617         char action_name[ACPI_PATHNAME_MAX] = { 0 };
 618         struct acpi_buffer bus = { ACPI_PATHNAME_MAX, bus_name };
 619         struct acpi_buffer act = { ACPI_PATHNAME_MAX, action_name };
 620
 621         ACPI_FUNCTION_TRACE(("hotkey_config_seq_show"));
 622
 623         list_for_each(entries, hotkey_list->entries) {
 624                 union acpi_hotkey *key =
 625                     container_of(entries, union acpi_hotkey, entries);
 626                 if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 627                         acpi_get_name(key->event_hotkey.bus_handle,
 628                                       ACPI_NAME_TYPE_MAX, &bus);
 629                         acpi_get_name(key->event_hotkey.action_handle,
 630                                       ACPI_NAME_TYPE_MAX, &act);
 631                         seq_printf(seq, "%s:%s:%s:%d:%d\n", bus_name,
 632                                    action_name,
 633                                    key->event_hotkey.action_method,
 634                                    key->link.hotkey_standard_num,
 635                                    key->event_hotkey.external_hotkey_num);
 636                 }
 637         }
 638         seq_puts(seq, "\n");
 639         return_VALUE(0);
 640 }
 641
 642 static int hotkey_poll_config_seq_show(struct seq_file *seq, void *offset)
 643 {
 644         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
 645         struct list_head *entries;
 646         char bus_name[ACPI_PATHNAME_MAX] = { 0 };
 647         char action_name[ACPI_PATHNAME_MAX] = { 0 };
 648         struct acpi_buffer bus = { ACPI_PATHNAME_MAX, bus_name };
 649         struct acpi_buffer act = { ACPI_PATHNAME_MAX, action_name };
 650
 651         ACPI_FUNCTION_TRACE(("hotkey_config_seq_show"));
 652
 653         list_for_each(entries, hotkey_list->entries) {
 654                 union acpi_hotkey *key =
 655                     container_of(entries, union acpi_hotkey, entries);
 656                 if (key->link.hotkey_type == ACPI_HOTKEY_POLLING) {
 657                         acpi_get_name(key->poll_hotkey.poll_handle,
 658                                       ACPI_NAME_TYPE_MAX, &bus);
 659                         acpi_get_name(key->poll_hotkey.action_handle,
 660                                       ACPI_NAME_TYPE_MAX, &act);
 661                         seq_printf(seq, "%s:%s:%s:%s:%d\n", bus_name,
 662                                    key->poll_hotkey.poll_method,
 663                                    action_name,
 664                                    key->poll_hotkey.action_method,
 665                                    key->link.hotkey_standard_num);
 666                 }
 667         }
 668         seq_puts(seq, "\n");
 669         return_VALUE(0);
 670 }
 671
 672 static int
 673 get_parms(char *config_record,
 674           int *cmd,
 675           char **bus_handle,
 676           char **bus_method,
 677           char **action_handle,
 678           char **method, int *internal_event_num, int *external_event_num)
 679 {
 680         char *tmp, *tmp1, count;
 681         ACPI_FUNCTION_TRACE(("get_parms"));
 682
 683         sscanf(config_record, "%d", cmd);
 684
 685         if (*cmd == 1) {
 686                 if (sscanf(config_record, "%d:%d", cmd, internal_event_num) !=
 687                     2)
 688                         goto do_fail;
 689                 else
 690                         return (6);
 691         }
 692         tmp = strchr(config_record, ':');
 693         if (!tmp)
 694                 goto do_fail;
 695         tmp++;
 696         tmp1 = strchr(tmp, ':');
 697         if (!tmp1)
 698                 goto do_fail;
 699
 700         count = tmp1 - tmp;
 701         *bus_handle = (char *)kmalloc(count + 1, GFP_KERNEL);
 702         if (!*bus_handle)
 703                 goto do_fail;
 704         strncpy(*bus_handle, tmp, count);
 705         *(*bus_handle + count) = 0;
 706
 707         tmp = tmp1;
 708         tmp++;
 709         tmp1 = strchr(tmp, ':');
 710         if (!tmp1)
 711                 goto do_fail;
 712         count = tmp1 - tmp;
 713         *bus_method = (char *)kmalloc(count + 1, GFP_KERNEL);
 714         if (!*bus_method)
 715                 goto do_fail;
 716         strncpy(*bus_method, tmp, count);
 717         *(*bus_method + count) = 0;
 718
 719         tmp = tmp1;
 720         tmp++;
 721         tmp1 = strchr(tmp, ':');
 722         if (!tmp1)
 723                 goto do_fail;
 724         count = tmp1 - tmp;
 725         *action_handle = (char *)kmalloc(count + 1, GFP_KERNEL);
 726         if (!*action_handle)
 727                 goto do_fail;
 728         strncpy(*action_handle, tmp, count);
 729         *(*action_handle + count) = 0;
 730
 731         tmp = tmp1;
 732         tmp++;
 733         tmp1 = strchr(tmp, ':');
 734         if (!tmp1)
 735                 goto do_fail;
 736         count = tmp1 - tmp;
 737         *method = (char *)kmalloc(count + 1, GFP_KERNEL);
 738         if (!*method)
 739                 goto do_fail;
 740         strncpy(*method, tmp, count);
 741         *(*method + count) = 0;
 742
 743         if (sscanf(tmp1 + 1, "%d:%d", internal_event_num, external_event_num) <=
 744             0)
 745                 goto do_fail;
 746
 747         return_VALUE(6);
 748       do_fail:
 749         return_VALUE(-1);
 750 }
 751
 752 /*  count is length for one input record */
 753 static ssize_t hotkey_write_config(struct file *file,
 754                                    const char __user * buffer,
 755                                    size_t count, loff_t * data)
 756 {
 757         char *config_record = NULL;
 758         char *bus_handle = NULL;
 759         char *bus_method = NULL;
 760         char *action_handle = NULL;
 761         char *method = NULL;
 762         int cmd, internal_event_num, external_event_num;
 763         int ret = 0;
 764         union acpi_hotkey *key = NULL;
 765
 766         ACPI_FUNCTION_TRACE(("hotkey_write_config"));
 767
 768         config_record = (char *)kmalloc(count + 1, GFP_KERNEL);
 769         if (!config_record)
 770                 return_VALUE(-ENOMEM);
 771
 772         if (copy_from_user(config_record, buffer, count)) {
 773                 kfree(config_record);
 774                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data \n"));
 775                 return_VALUE(-EINVAL);
 776         }
 777         config_record[count] = 0;
 778
 779         ret = get_parms(config_record,
 780                         &cmd,
 781                         &bus_handle,
 782                         &bus_method,
 783                         &action_handle,
 784                         &method, &internal_event_num, &external_event_num);
 785
 786         kfree(config_record);
 787         if (IS_OTHERS(internal_event_num))
 788                 goto do_fail;
 789         if (ret != 6) {
 790               do_fail:
 791                 kfree(bus_handle);
 792                 kfree(bus_method);
 793                 kfree(action_handle);
 794                 kfree(method);
 795                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 796                                   "Invalid data format ret=%d\n", ret));
 797                 return_VALUE(-EINVAL);
 798         }
 799
 800         key = kmalloc(sizeof(union acpi_hotkey), GFP_KERNEL);
 801         if (!key)
 802                 goto do_fail;
 803         memset(key, 0, sizeof(union acpi_hotkey));
 804         if (cmd == 1) {
 805                 union acpi_hotkey *tmp = NULL;
 806                 tmp = get_hotkey_by_event(&global_hotkey_list,
 807                                           internal_event_num);
 808                 if (!tmp)
 809                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid key"));
 810                 else
 811                         memcpy(key, tmp, sizeof(union acpi_hotkey));
 812                 goto cont_cmd;
 813         }
 814         if (IS_EVENT(internal_event_num)) {
 815                 kfree(bus_method);
 816                 ret = init_hotkey_device(key, bus_handle, action_handle, method,
 817                                          internal_event_num,
 818                                          external_event_num);
 819         } else
 820                 ret = init_poll_hotkey_device(key, bus_handle, bus_method,
 821                                               action_handle, method,
 822                                               internal_event_num);
 823         if (ret) {
 824                 kfree(bus_handle);
 825                 kfree(action_handle);
 826                 if (IS_EVENT(internal_event_num))
 827                         free_hotkey_buffer(key);
 828                 else
 829                         free_poll_hotkey_buffer(key);
 830                 kfree(key);
 831                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid hotkey \n"));
 832                 return_VALUE(-EINVAL);
 833         }
 834
 835       cont_cmd:
 836         kfree(bus_handle);
 837         kfree(action_handle);
 838
 839         switch (cmd) {
 840         case 0:
 841                 if (get_hotkey_by_event
 842                     (&global_hotkey_list, key->link.hotkey_standard_num))
 843                         goto fail_out;
 844                 else
 845                         hotkey_add(key);
 846                 break;
 847         case 1:
 848                 hotkey_remove(key);
 849                 break;
 850         case 2:
 851                 if (hotkey_update(key))
 852                         goto fail_out;
 853                 break;
 854         default:
 855                 goto fail_out;
 856                 break;
 857         }
 858         return_VALUE(count);
 859       fail_out:
 860         if (IS_EVENT(internal_event_num))
 861                 free_hotkey_buffer(key);
 862         else
 863                 free_poll_hotkey_buffer(key);
 864         kfree(key);
 865         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "invalid key\n"));
 866         return_VALUE(-EINVAL);
 867 }
 868
 869 /*
 870  * This function evaluates an ACPI method, given an int as parameter, the
 871  * method is searched within the scope of the handle, can be NULL. The output
 872  * of the method is written is output, which can also be NULL
 873  *
 874  * returns 1 if write is successful, 0 else.
 875  */
 876 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 877                           struct acpi_buffer *output)
 878 {
 879         struct acpi_object_list params; /* list of input parameters (an int here) */
 880         union acpi_object in_obj;       /* the only param we use */
 881         acpi_status status;
 882
 883         ACPI_FUNCTION_TRACE("write_acpi_int");
 884         params.count = 1;
 885         params.pointer = &in_obj;
 886         in_obj.type = ACPI_TYPE_INTEGER;
 887         in_obj.integer.value = val;
 888
 889         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 890
 891         return_VALUE(status == AE_OK);
 892 }
 893
 894 static int read_acpi_int(acpi_handle handle, const char *method,
 895                          union acpi_object *val)
 896 {
 897         struct acpi_buffer output;
 898         union acpi_object out_obj;
 899         acpi_status status;
 900
 901         ACPI_FUNCTION_TRACE("read_acpi_int");
 902         output.length = sizeof(out_obj);
 903         output.pointer = &out_obj;
 904
 905         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 906         if (val) {
 907                 val->integer.value = out_obj.integer.value;
 908                 val->type = out_obj.type;
 909         } else
 910                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "null val pointer"));
 911         return_VALUE((status == AE_OK)
 912                      && (out_obj.type == ACPI_TYPE_INTEGER));
 913 }
 914
 915 static union acpi_hotkey *get_hotkey_by_event(struct
 916                                               acpi_hotkey_list
 917                                               *hotkey_list, int event)
 918 {
 919         struct list_head *entries;
 920
 921         list_for_each(entries, hotkey_list->entries) {
 922                 union acpi_hotkey *key =
 923                     container_of(entries, union acpi_hotkey, entries);
 924                 if (key->link.hotkey_standard_num == event) {
 925                         return (key);
 926                 }
 927         }
 928         return (NULL);
 929 }
 930
 931 /*
 932  * user call AML method interface:
 933  * Call convention:
 934  * echo "event_num: arg type : value"
 935  * example: echo "1:1:30" > /proc/acpi/action
 936  * Just support 1 integer arg passing to AML method
 937  */
 938
 939 static ssize_t hotkey_execute_aml_method(struct file *file,
 940                                          const char __user * buffer,
 941                                          size_t count, loff_t * data)
 942 {
 943         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
 944         char *arg;
 945         int event, method_type, type, value;
 946         union acpi_hotkey *key;
 947
 948         ACPI_FUNCTION_TRACE("hotkey_execte_aml_method");
 949
 950         arg = (char *)kmalloc(count + 1, GFP_KERNEL);
 951         if (!arg)
 952                 return_VALUE(-ENOMEM);
 953         arg[count] = 0;
 954
 955         if (copy_from_user(arg, buffer, count)) {
 956                 kfree(arg);
 957                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument 2"));
 958                 return_VALUE(-EINVAL);
 959         }
 960
 961         if (sscanf(arg, "%d:%d:%d:%d", &event, &method_type, &type, &value) !=
 962             4) {
 963                 kfree(arg);
 964                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument 3"));
 965                 return_VALUE(-EINVAL);
 966         }
 967         kfree(arg);
 968         if (type == ACPI_TYPE_INTEGER) {
 969                 key = get_hotkey_by_event(hotkey_list, event);
 970                 if (!key)
 971                         goto do_fail;
 972                 if (IS_EVENT(event))
 973                         write_acpi_int(key->event_hotkey.action_handle,
 974                                        key->event_hotkey.action_method, value,
 975                                        NULL);
 976                 else if (IS_POLL(event)) {
 977                         if (method_type == POLL_METHOD)
 978                                 read_acpi_int(key->poll_hotkey.poll_handle,
 979                                               key->poll_hotkey.poll_method,
 980                                               key->poll_hotkey.poll_result);
 981                         else if (method_type == ACTION_METHOD)
 982                                 write_acpi_int(key->poll_hotkey.action_handle,
 983                                                key->poll_hotkey.action_method,
 984                                                value, NULL);
 985                         else
 986                                 goto do_fail;
 987
 988                 }
 989         } else {
 990                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Not supported"));
 991                 return_VALUE(-EINVAL);
 992         }
 993         return_VALUE(count);
 994       do_fail:
 995         return_VALUE(-EINVAL);
 996
 997 }
 998
 999 static int __init hotkey_init(void)
1000 {
1001         int result;
1002         mode_t mode = S_IFREG | S_IRUGO | S_IWUGO;
1003
1004         ACPI_FUNCTION_TRACE("hotkey_init");
1005
1006         if (acpi_disabled)
1007                 return -ENODEV;
1008
1009         if (acpi_specific_hotkey_enabled) {
1010                 printk("Using specific hotkey driver\n");
1011                 return -ENODEV;
1012         }
1013
1014         hotkey_proc_dir = proc_mkdir(HOTKEY_PROC, acpi_root_dir);
1015         if (!hotkey_proc_dir) {
1016                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1017                                   "Hotkey: Unable to create %s entry\n",
1018                                   HOTKEY_PROC));
1019                 return (-ENODEV);
1020         }
1021         hotkey_proc_dir->owner = THIS_MODULE;
1022
1023         hotkey_config =
1024             create_proc_entry(HOTKEY_EV_CONFIG, mode, hotkey_proc_dir);
1025         if (!hotkey_config) {
1026                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1027                                   "Hotkey: Unable to create %s entry\n",
1028                                   HOTKEY_EV_CONFIG));
1029                 goto do_fail1;
1030         } else {
1031                 hotkey_config->proc_fops = &hotkey_config_fops;
1032                 hotkey_config->data = &global_hotkey_list;
1033                 hotkey_config->owner = THIS_MODULE;
1034                 hotkey_config->uid = 0;
1035                 hotkey_config->gid = 0;
1036         }
1037
1038         hotkey_poll_config =
1039             create_proc_entry(HOTKEY_PL_CONFIG, mode, hotkey_proc_dir);
1040         if (!hotkey_poll_config) {
1041                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1042                                   "Hotkey: Unable to create %s entry\n",
1043                                   HOTKEY_EV_CONFIG));
1044
1045                 goto do_fail2;
1046         } else {
1047                 hotkey_poll_config->proc_fops = &hotkey_poll_config_fops;
1048                 hotkey_poll_config->data = &global_hotkey_list;
1049                 hotkey_poll_config->owner = THIS_MODULE;
1050                 hotkey_poll_config->uid = 0;
1051                 hotkey_poll_config->gid = 0;
1052         }
1053
1054         hotkey_action = create_proc_entry(HOTKEY_ACTION, mode, hotkey_proc_dir);
1055         if (!hotkey_action) {
1056                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1057                                   "Hotkey: Unable to create %s entry\n",
1058                                   HOTKEY_ACTION));
1059                 goto do_fail3;
1060         } else {
1061                 hotkey_action->proc_fops = &hotkey_action_fops;
1062                 hotkey_action->owner = THIS_MODULE;
1063                 hotkey_action->uid = 0;
1064                 hotkey_action->gid = 0;
1065         }
1066
1067         hotkey_info = create_proc_entry(HOTKEY_INFO, mode, hotkey_proc_dir);
1068         if (!hotkey_info) {
1069                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1070                                   "Hotkey: Unable to create %s entry\n",
1071                                   HOTKEY_INFO));
1072                 goto do_fail4;
1073         } else {
1074                 hotkey_info->proc_fops = &hotkey_info_fops;
1075                 hotkey_info->owner = THIS_MODULE;
1076                 hotkey_info->uid = 0;
1077                 hotkey_info->gid = 0;
1078         }
1079
1080         result = acpi_bus_register_driver(&hotkey_driver);
1081         if (result < 0)
1082                 goto do_fail5;
1083         global_hotkey_list.count = 0;
1084         global_hotkey_list.entries = &hotkey_entries;
1085
1086         INIT_LIST_HEAD(&hotkey_entries);
1087
1088         return (0);
1089
1090       do_fail5:
1091         remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
1092       do_fail4:
1093         remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
1094       do_fail3:
1095         remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
1096       do_fail2:
1097         remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
1098       do_fail1:
1099         remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
1100         return (-ENODEV);
1101 }
1102
1103 static void __exit hotkey_exit(void)
1104 {
1105         struct list_head *entries, *next;
1106
1107         ACPI_FUNCTION_TRACE("hotkey_exit");
1108
1109         list_for_each_safe(entries, next, global_hotkey_list.entries) {
1110                 union acpi_hotkey *key =
1111                     container_of(entries, union acpi_hotkey, entries);
1112
1113                 acpi_os_wait_events_complete(NULL);
1114                 list_del(&key->link.entries);
1115                 global_hotkey_list.count--;
1116                 free_hotkey_device(key);
1117         }
1118         acpi_bus_unregister_driver(&hotkey_driver);
1119         remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
1120         remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
1121         remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
1122         remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
1123         remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
1124         return;
1125 }
1126
1127 module_init(hotkey_init);
1128 module_exit(hotkey_exit);