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 enum conf_entry_enum {
  95         bus_handle = 0,
  96         bus_method = 1,
  97         action_handle = 2,
  98         method = 3,
  99         LAST_CONF_ENTRY
 100 };
 101
 102 /*  procdir we use */
 103 static struct proc_dir_entry *hotkey_proc_dir;
 104 static struct proc_dir_entry *hotkey_config;
 105 static struct proc_dir_entry *hotkey_poll_config;
 106 static struct proc_dir_entry *hotkey_action;
 107 static struct proc_dir_entry *hotkey_info;
 108
 109 /* linkage for all type of hotkey */
 110 struct acpi_hotkey_link {
 111         struct list_head entries;
 112         int hotkey_type;        /* event or polling based hotkey  */
 113         int hotkey_standard_num;        /* standardized hotkey(event) number */
 114 };
 115
 116 /* event based hotkey */
 117 struct acpi_event_hotkey {
 118         struct acpi_hotkey_link hotkey_link;
 119         int flag;
 120         acpi_handle bus_handle; /* bus to install notify handler */
 121         int external_hotkey_num;        /* external hotkey/event number */
 122         acpi_handle action_handle;      /* acpi handle attached aml action method */
 123         char *action_method;    /* action method */
 124 };
 125
 126 /*
 127  * There are two ways to poll status
 128  * 1. directy call read_xxx method, without any arguments passed in
 129  * 2. call write_xxx method, with arguments passed in, you need
 130  * the result is saved in acpi_polling_hotkey.poll_result.
 131  * anthoer read command through polling interface.
 132  *
 133  */
 134
 135 /* polling based hotkey */
 136 struct acpi_polling_hotkey {
 137         struct acpi_hotkey_link hotkey_link;
 138         int flag;
 139         acpi_handle poll_handle;        /* acpi handle attached polling method */
 140         char *poll_method;      /* poll method */
 141         acpi_handle action_handle;      /* acpi handle attached action method */
 142         char *action_method;    /* action method */
 143         union acpi_object *poll_result; /* polling_result */
 144         struct proc_dir_entry *proc;
 145 };
 146
 147 /* hotkey object union */
 148 union acpi_hotkey {
 149         struct list_head entries;
 150         struct acpi_hotkey_link link;
 151         struct acpi_event_hotkey event_hotkey;
 152         struct acpi_polling_hotkey poll_hotkey;
 153 };
 154
 155 /* hotkey object list */
 156 struct acpi_hotkey_list {
 157         struct list_head *entries;
 158         int count;
 159 };
 160
 161 static int auto_hotkey_add(struct acpi_device *device);
 162 static int auto_hotkey_remove(struct acpi_device *device, int type);
 163
 164 static struct acpi_driver hotkey_driver = {
 165         .name = ACPI_HOTK_NAME,
 166         .class = ACPI_HOTK_CLASS,
 167         .ids = ACPI_HOTK_HID,
 168         .ops = {
 169                 .add = auto_hotkey_add,
 170                 .remove = auto_hotkey_remove,
 171                 },
 172 };
 173
 174 static void free_hotkey_device(union acpi_hotkey *key);
 175 static void free_hotkey_buffer(union acpi_hotkey *key);
 176 static void free_poll_hotkey_buffer(union acpi_hotkey *key);
 177 static int hotkey_open_config(struct inode *inode, struct file *file);
 178 static int hotkey_poll_open_config(struct inode *inode, struct file *file);
 179 static ssize_t hotkey_write_config(struct file *file,
 180                                    const char __user * buffer,
 181                                    size_t count, loff_t * data);
 182 static int hotkey_info_open_fs(struct inode *inode, struct file *file);
 183 static int hotkey_action_open_fs(struct inode *inode, struct file *file);
 184 static ssize_t hotkey_execute_aml_method(struct file *file,
 185                                          const char __user * buffer,
 186                                          size_t count, loff_t * data);
 187 static int hotkey_config_seq_show(struct seq_file *seq, void *offset);
 188 static int hotkey_poll_config_seq_show(struct seq_file *seq, void *offset);
 189 static int hotkey_polling_open_fs(struct inode *inode, struct file *file);
 190 static union acpi_hotkey *get_hotkey_by_event(struct
 191                                               acpi_hotkey_list
 192                                               *hotkey_list, int event);
 193
 194 /* event based config */
 195 static const struct file_operations hotkey_config_fops = {
 196         .open = hotkey_open_config,
 197         .read = seq_read,
 198         .write = hotkey_write_config,
 199         .llseek = seq_lseek,
 200         .release = single_release,
 201 };
 202
 203 /* polling based config */
 204 static const struct file_operations hotkey_poll_config_fops = {
 205         .open = hotkey_poll_open_config,
 206         .read = seq_read,
 207         .write = hotkey_write_config,
 208         .llseek = seq_lseek,
 209         .release = single_release,
 210 };
 211
 212 /* hotkey driver info */
 213 static const struct file_operations hotkey_info_fops = {
 214         .open = hotkey_info_open_fs,
 215         .read = seq_read,
 216         .llseek = seq_lseek,
 217         .release = single_release,
 218 };
 219
 220 /* action */
 221 static const struct file_operations hotkey_action_fops = {
 222         .open = hotkey_action_open_fs,
 223         .read = seq_read,
 224         .write = hotkey_execute_aml_method,
 225         .llseek = seq_lseek,
 226         .release = single_release,
 227 };
 228
 229 /* polling results */
 230 static const struct file_operations hotkey_polling_fops = {
 231         .open = hotkey_polling_open_fs,
 232         .read = seq_read,
 233         .llseek = seq_lseek,
 234         .release = single_release,
 235 };
 236
 237 struct acpi_hotkey_list global_hotkey_list;     /* link all ev or pl hotkey  */
 238 struct list_head hotkey_entries;        /* head of the list of hotkey_list */
 239
 240 static int hotkey_info_seq_show(struct seq_file *seq, void *offset)
 241 {
 242
 243         seq_printf(seq, "Hotkey generic driver ver: %s\n", HOTKEY_ACPI_VERSION);
 244
 245         return 0;
 246 }
 247
 248 static int hotkey_info_open_fs(struct inode *inode, struct file *file)
 249 {
 250         return single_open(file, hotkey_info_seq_show, PDE(inode)->data);
 251 }
 252
 253 static char *format_result(union acpi_object *object)
 254 {
 255         char *buf;
 256
 257         buf = kzalloc(RESULT_STR_LEN, GFP_KERNEL);
 258         if (!buf)
 259                 return NULL;
 260         /* Now, just support integer type */
 261         if (object->type == ACPI_TYPE_INTEGER)
 262                 sprintf(buf, "%d\n", (u32) object->integer.value);
 263         return buf;
 264 }
 265
 266 static int hotkey_polling_seq_show(struct seq_file *seq, void *offset)
 267 {
 268         struct acpi_polling_hotkey *poll_hotkey =
 269             (struct acpi_polling_hotkey *)seq->private;
 270         char *buf;
 271
 272
 273         if (poll_hotkey->poll_result) {
 274                 buf = format_result(poll_hotkey->poll_result);
 275                 if (buf)
 276                         seq_printf(seq, "%s", buf);
 277                 kfree(buf);
 278         }
 279         return 0;
 280 }
 281
 282 static int hotkey_polling_open_fs(struct inode *inode, struct file *file)
 283 {
 284         return single_open(file, hotkey_polling_seq_show, PDE(inode)->data);
 285 }
 286
 287 static int hotkey_action_open_fs(struct inode *inode, struct file *file)
 288 {
 289         return single_open(file, hotkey_info_seq_show, PDE(inode)->data);
 290 }
 291
 292 /* Mapping external hotkey number to standardized hotkey event num */
 293 static int hotkey_get_internal_event(int event, struct acpi_hotkey_list *list)
 294 {
 295         struct list_head *entries;
 296         int val = -1;
 297
 298
 299         list_for_each(entries, list->entries) {
 300                 union acpi_hotkey *key =
 301                     container_of(entries, union acpi_hotkey, entries);
 302                 if (key->link.hotkey_type == ACPI_HOTKEY_EVENT
 303                     && key->event_hotkey.external_hotkey_num == event) {
 304                         val = key->link.hotkey_standard_num;
 305                         break;
 306                 }
 307         }
 308
 309         return val;
 310 }
 311
 312 static void
 313 acpi_hotkey_notify_handler(acpi_handle handle, u32 event, void *data)
 314 {
 315         struct acpi_device *device = NULL;
 316         u32 internal_event;
 317
 318
 319         if (acpi_bus_get_device(handle, &device))
 320                 return;
 321
 322         internal_event = hotkey_get_internal_event(event, &global_hotkey_list);
 323         acpi_bus_generate_event(device, internal_event, 0);
 324
 325         return;
 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         mode = S_IFREG | S_IRUGO | S_IWUGO;
 350
 351         sprintf(proc_name, "%d", device->link.hotkey_standard_num);
 352         /*
 353            strcat(proc_name, device->poll_hotkey.poll_method);
 354          */
 355         proc = create_proc_entry(proc_name, mode, hotkey_proc_dir);
 356
 357         if (!proc) {
 358                 return -ENODEV;
 359         } else {
 360                 proc->proc_fops = &hotkey_polling_fops;
 361                 proc->owner = THIS_MODULE;
 362                 proc->data = device;
 363                 proc->uid = 0;
 364                 proc->gid = 0;
 365                 device->poll_hotkey.proc = proc;
 366         }
 367         return 0;
 368 }
 369
 370 static int hotkey_add(union acpi_hotkey *device)
 371 {
 372         int status = 0;
 373         struct acpi_device *dev = NULL;
 374
 375
 376         if (device->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 377                 acpi_bus_get_device(device->event_hotkey.bus_handle, &dev);
 378                 status = acpi_install_notify_handler(dev->handle,
 379                                                      ACPI_DEVICE_NOTIFY,
 380                                                      acpi_hotkey_notify_handler,
 381                                                      dev);
 382         } else                  /* Add polling hotkey */
 383                 create_polling_proc(device);
 384
 385         global_hotkey_list.count++;
 386
 387         list_add_tail(&device->link.entries, global_hotkey_list.entries);
 388
 389         return status;
 390 }
 391
 392 static int hotkey_remove(union acpi_hotkey *device)
 393 {
 394         struct list_head *entries, *next;
 395
 396
 397         list_for_each_safe(entries, next, global_hotkey_list.entries) {
 398                 union acpi_hotkey *key =
 399                     container_of(entries, union acpi_hotkey, entries);
 400                 if (key->link.hotkey_standard_num ==
 401                     device->link.hotkey_standard_num) {
 402                         list_del(&key->link.entries);
 403                         free_hotkey_device(key);
 404                         global_hotkey_list.count--;
 405                         break;
 406                 }
 407         }
 408         kfree(device);
 409         return 0;
 410 }
 411
 412 static int hotkey_update(union acpi_hotkey *key)
 413 {
 414         struct list_head *entries;
 415
 416
 417         list_for_each(entries, global_hotkey_list.entries) {
 418                 union acpi_hotkey *tmp =
 419                     container_of(entries, union acpi_hotkey, entries);
 420                 if (tmp->link.hotkey_standard_num ==
 421                     key->link.hotkey_standard_num) {
 422                         if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 423                                 free_hotkey_buffer(tmp);
 424                                 tmp->event_hotkey.bus_handle =
 425                                     key->event_hotkey.bus_handle;
 426                                 tmp->event_hotkey.external_hotkey_num =
 427                                     key->event_hotkey.external_hotkey_num;
 428                                 tmp->event_hotkey.action_handle =
 429                                     key->event_hotkey.action_handle;
 430                                 tmp->event_hotkey.action_method =
 431                                     key->event_hotkey.action_method;
 432                                 kfree(key);
 433                         } else {
 434                                 /*
 435                                    char  proc_name[80];
 436
 437                                    sprintf(proc_name, "%d", tmp->link.hotkey_standard_num);
 438                                    strcat(proc_name, tmp->poll_hotkey.poll_method);
 439                                    remove_proc_entry(proc_name,hotkey_proc_dir);
 440                                  */
 441                                 free_poll_hotkey_buffer(tmp);
 442                                 tmp->poll_hotkey.poll_handle =
 443                                     key->poll_hotkey.poll_handle;
 444                                 tmp->poll_hotkey.poll_method =
 445                                     key->poll_hotkey.poll_method;
 446                                 tmp->poll_hotkey.action_handle =
 447                                     key->poll_hotkey.action_handle;
 448                                 tmp->poll_hotkey.action_method =
 449                                     key->poll_hotkey.action_method;
 450                                 tmp->poll_hotkey.poll_result =
 451                                     key->poll_hotkey.poll_result;
 452                                 /*
 453                                    create_polling_proc(tmp);
 454                                  */
 455                                 kfree(key);
 456                         }
 457                         return 0;
 458                         break;
 459                 }
 460         }
 461
 462         return -ENODEV;
 463 }
 464
 465 static void free_hotkey_device(union acpi_hotkey *key)
 466 {
 467         struct acpi_device *dev;
 468
 469
 470         if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 471                 acpi_bus_get_device(key->event_hotkey.bus_handle, &dev);
 472                 if (dev->handle)
 473                         acpi_remove_notify_handler(dev->handle,
 474                                                    ACPI_DEVICE_NOTIFY,
 475                                                    acpi_hotkey_notify_handler);
 476                 free_hotkey_buffer(key);
 477         } else {
 478                 char proc_name[80];
 479
 480                 sprintf(proc_name, "%d", key->link.hotkey_standard_num);
 481                 /*
 482                    strcat(proc_name, key->poll_hotkey.poll_method);
 483                  */
 484                 remove_proc_entry(proc_name, hotkey_proc_dir);
 485                 free_poll_hotkey_buffer(key);
 486         }
 487         kfree(key);
 488         return;
 489 }
 490
 491 static void free_hotkey_buffer(union acpi_hotkey *key)
 492 {
 493         /* key would never be null, action method could be */
 494         kfree(key->event_hotkey.action_method);
 495 }
 496
 497 static void free_poll_hotkey_buffer(union acpi_hotkey *key)
 498 {
 499         /* key would never be null, others could be*/
 500         kfree(key->poll_hotkey.action_method);
 501         kfree(key->poll_hotkey.poll_method);
 502         kfree(key->poll_hotkey.poll_result);
 503 }
 504 static int
 505 init_hotkey_device(union acpi_hotkey *key, char **config_entry,
 506                    int std_num, int external_num)
 507 {
 508         acpi_handle tmp_handle;
 509         acpi_status status = AE_OK;
 510
 511         if (std_num < 0 || IS_POLL(std_num) || !key)
 512                 goto do_fail;
 513
 514         if (!config_entry[bus_handle] || !config_entry[action_handle]
 515                         || !config_entry[method])
 516                 goto do_fail;
 517
 518         key->link.hotkey_type = ACPI_HOTKEY_EVENT;
 519         key->link.hotkey_standard_num = std_num;
 520         key->event_hotkey.flag = 0;
 521         key->event_hotkey.action_method = config_entry[method];
 522
 523         status = acpi_get_handle(NULL, config_entry[bus_handle],
 524                            &(key->event_hotkey.bus_handle));
 525         if (ACPI_FAILURE(status))
 526                 goto do_fail_zero;
 527         key->event_hotkey.external_hotkey_num = external_num;
 528         status = acpi_get_handle(NULL, config_entry[action_handle],
 529                             &(key->event_hotkey.action_handle));
 530         if (ACPI_FAILURE(status))
 531                 goto do_fail_zero;
 532         status = acpi_get_handle(key->event_hotkey.action_handle,
 533                                  config_entry[method], &tmp_handle);
 534         if (ACPI_FAILURE(status))
 535                 goto do_fail_zero;
 536         return AE_OK;
 537 do_fail_zero:
 538         key->event_hotkey.action_method = NULL;
 539 do_fail:
 540         return -ENODEV;
 541 }
 542
 543 static int
 544 init_poll_hotkey_device(union acpi_hotkey *key, char **config_entry,
 545                         int std_num)
 546 {
 547         acpi_status status = AE_OK;
 548         acpi_handle tmp_handle;
 549
 550         if (std_num < 0 || IS_EVENT(std_num) || !key)
 551                 goto do_fail;
 552         if (!config_entry[bus_handle] ||!config_entry[bus_method] ||
 553                 !config_entry[action_handle] || !config_entry[method])
 554                 goto do_fail;
 555
 556         key->link.hotkey_type = ACPI_HOTKEY_POLLING;
 557         key->link.hotkey_standard_num = std_num;
 558         key->poll_hotkey.flag = 0;
 559         key->poll_hotkey.poll_method = config_entry[bus_method];
 560         key->poll_hotkey.action_method = config_entry[method];
 561
 562         status = acpi_get_handle(NULL, config_entry[bus_handle],
 563                       &(key->poll_hotkey.poll_handle));
 564         if (ACPI_FAILURE(status))
 565                 goto do_fail_zero;
 566         status = acpi_get_handle(key->poll_hotkey.poll_handle,
 567                                  config_entry[bus_method], &tmp_handle);
 568         if (ACPI_FAILURE(status))
 569                 goto do_fail_zero;
 570         status =
 571             acpi_get_handle(NULL, config_entry[action_handle],
 572                             &(key->poll_hotkey.action_handle));
 573         if (ACPI_FAILURE(status))
 574                 goto do_fail_zero;
 575         status = acpi_get_handle(key->poll_hotkey.action_handle,
 576                                  config_entry[method], &tmp_handle);
 577         if (ACPI_FAILURE(status))
 578                 goto do_fail_zero;
 579         key->poll_hotkey.poll_result =
 580             (union acpi_object *)kmalloc(sizeof(union acpi_object), GFP_KERNEL);
 581         if (!key->poll_hotkey.poll_result)
 582                 goto do_fail_zero;
 583         return AE_OK;
 584
 585 do_fail_zero:
 586         key->poll_hotkey.poll_method = NULL;
 587         key->poll_hotkey.action_method = NULL;
 588 do_fail:
 589         return -ENODEV;
 590 }
 591
 592 static int hotkey_open_config(struct inode *inode, struct file *file)
 593 {
 594         return (single_open
 595                      (file, hotkey_config_seq_show, PDE(inode)->data));
 596 }
 597
 598 static int hotkey_poll_open_config(struct inode *inode, struct file *file)
 599 {
 600         return (single_open
 601                      (file, hotkey_poll_config_seq_show, PDE(inode)->data));
 602 }
 603
 604 static int hotkey_config_seq_show(struct seq_file *seq, void *offset)
 605 {
 606         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
 607         struct list_head *entries;
 608         char bus_name[ACPI_PATHNAME_MAX] = { 0 };
 609         char action_name[ACPI_PATHNAME_MAX] = { 0 };
 610         struct acpi_buffer bus = { ACPI_PATHNAME_MAX, bus_name };
 611         struct acpi_buffer act = { ACPI_PATHNAME_MAX, action_name };
 612
 613
 614         list_for_each(entries, hotkey_list->entries) {
 615                 union acpi_hotkey *key =
 616                     container_of(entries, union acpi_hotkey, entries);
 617                 if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 618                         acpi_get_name(key->event_hotkey.bus_handle,
 619                                       ACPI_NAME_TYPE_MAX, &bus);
 620                         acpi_get_name(key->event_hotkey.action_handle,
 621                                       ACPI_NAME_TYPE_MAX, &act);
 622                         seq_printf(seq, "%s:%s:%s:%d:%d\n", bus_name,
 623                                    action_name,
 624                                    key->event_hotkey.action_method,
 625                                    key->link.hotkey_standard_num,
 626                                    key->event_hotkey.external_hotkey_num);
 627                 }
 628         }
 629         seq_puts(seq, "\n");
 630         return 0;
 631 }
 632
 633 static int hotkey_poll_config_seq_show(struct seq_file *seq, void *offset)
 634 {
 635         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
 636         struct list_head *entries;
 637         char bus_name[ACPI_PATHNAME_MAX] = { 0 };
 638         char action_name[ACPI_PATHNAME_MAX] = { 0 };
 639         struct acpi_buffer bus = { ACPI_PATHNAME_MAX, bus_name };
 640         struct acpi_buffer act = { ACPI_PATHNAME_MAX, action_name };
 641
 642
 643         list_for_each(entries, hotkey_list->entries) {
 644                 union acpi_hotkey *key =
 645                     container_of(entries, union acpi_hotkey, entries);
 646                 if (key->link.hotkey_type == ACPI_HOTKEY_POLLING) {
 647                         acpi_get_name(key->poll_hotkey.poll_handle,
 648                                       ACPI_NAME_TYPE_MAX, &bus);
 649                         acpi_get_name(key->poll_hotkey.action_handle,
 650                                       ACPI_NAME_TYPE_MAX, &act);
 651                         seq_printf(seq, "%s:%s:%s:%s:%d\n", bus_name,
 652                                    key->poll_hotkey.poll_method,
 653                                    action_name,
 654                                    key->poll_hotkey.action_method,
 655                                    key->link.hotkey_standard_num);
 656                 }
 657         }
 658         seq_puts(seq, "\n");
 659         return 0;
 660 }
 661
 662 static int
 663 get_parms(char *config_record, int *cmd, char **config_entry,
 664                int *internal_event_num, int *external_event_num)
 665 {
 666 /* the format of *config_record =
 667  * "1:\d+:*" : "cmd:internal_event_num"
 668  * "\d+:\w+:\w+:\w+:\w+:\d+:\d+" :
 669  * "cmd:bus_handle:bus_method:action_handle:method:internal_event_num:external_event_num"
 670  */
 671         char *tmp, *tmp1, count;
 672         int i;
 673
 674         sscanf(config_record, "%d", cmd);
 675         if (*cmd == 1) {
 676                 if (sscanf(config_record, "%d:%d", cmd, internal_event_num) !=
 677                     2)
 678                         goto do_fail;
 679                 else
 680                         return (6);
 681         }
 682         tmp = strchr(config_record, ':');
 683         if (!tmp)
 684                 goto do_fail;
 685         tmp++;
 686         for (i = 0; i < LAST_CONF_ENTRY; i++) {
 687                 tmp1 = strchr(tmp, ':');
 688                 if (!tmp1) {
 689                         goto do_fail;
 690                 }
 691                 count = tmp1 - tmp;
 692                 config_entry[i] = kzalloc(count + 1, GFP_KERNEL);
 693                 if (!config_entry[i])
 694                         goto handle_failure;
 695                 strncpy(config_entry[i], tmp, count);
 696                 tmp = tmp1 + 1;
 697         }
 698         if (sscanf(tmp, "%d:%d", internal_event_num, external_event_num) <= 0)
 699                 goto handle_failure;
 700         if (!IS_OTHERS(*internal_event_num)) {
 701                 return 6;
 702         }
 703 handle_failure:
 704         while (i-- > 0)
 705                 kfree(config_entry[i]);
 706 do_fail:
 707         return -1;
 708 }
 709
 710 /*  count is length for one input record */
 711 static ssize_t hotkey_write_config(struct file *file,
 712                                    const char __user * buffer,
 713                                    size_t count, loff_t * data)
 714 {
 715         char *config_record = NULL;
 716         char *config_entry[LAST_CONF_ENTRY];
 717         int cmd, internal_event_num, external_event_num;
 718         int ret = 0;
 719         union acpi_hotkey *key = kzalloc(sizeof(union acpi_hotkey), GFP_KERNEL);
 720
 721         if (!key)
 722                 return -ENOMEM;
 723
 724         config_record = kzalloc(count + 1, GFP_KERNEL);
 725         if (!config_record) {
 726                 kfree(key);
 727                 return -ENOMEM;
 728         }
 729
 730         if (copy_from_user(config_record, buffer, count)) {
 731                 kfree(config_record);
 732                 kfree(key);
 733                 printk(KERN_ERR PREFIX "Invalid data\n");
 734                 return -EINVAL;
 735         }
 736         ret = get_parms(config_record, &cmd, config_entry,
 737                        &internal_event_num, &external_event_num);
 738         kfree(config_record);
 739         if (ret != 6) {
 740                 printk(KERN_ERR PREFIX "Invalid data format ret=%d\n", ret);
 741                 return -EINVAL;
 742         }
 743
 744         if (cmd == 1) {
 745                 union acpi_hotkey *tmp = NULL;
 746                 tmp = get_hotkey_by_event(&global_hotkey_list,
 747                                           internal_event_num);
 748                 if (!tmp)
 749                         printk(KERN_ERR PREFIX "Invalid key\n");
 750                 else
 751                         memcpy(key, tmp, sizeof(union acpi_hotkey));
 752                 goto cont_cmd;
 753         }
 754         if (IS_EVENT(internal_event_num)) {
 755                 if (init_hotkey_device(key, config_entry,
 756                         internal_event_num, external_event_num))
 757                         goto init_hotkey_fail;
 758         } else {
 759                 if (init_poll_hotkey_device(key, config_entry,
 760                                internal_event_num))
 761                         goto init_poll_hotkey_fail;
 762         }
 763 cont_cmd:
 764         switch (cmd) {
 765         case 0:
 766                 if (get_hotkey_by_event(&global_hotkey_list,
 767                                 key->link.hotkey_standard_num))
 768                         goto fail_out;
 769                 else
 770                         hotkey_add(key);
 771                 break;
 772         case 1:
 773                 hotkey_remove(key);
 774                 break;
 775         case 2:
 776                 /* key is kfree()ed if matched*/
 777                 if (hotkey_update(key))
 778                         goto fail_out;
 779                 break;
 780         default:
 781                 goto fail_out;
 782                 break;
 783         }
 784         return count;
 785
 786 init_poll_hotkey_fail:          /* failed init_poll_hotkey_device */
 787         kfree(config_entry[bus_method]);
 788         config_entry[bus_method] = NULL;
 789 init_hotkey_fail:               /* failed init_hotkey_device */
 790         kfree(config_entry[method]);
 791 fail_out:
 792         kfree(config_entry[bus_handle]);
 793         kfree(config_entry[action_handle]);
 794         /* No double free since elements =NULL for error cases */
 795         if (IS_EVENT(internal_event_num)) {
 796                 if (config_entry[bus_method])
 797                         kfree(config_entry[bus_method]);
 798                 free_hotkey_buffer(key);        /* frees [method] */
 799         } else
 800                 free_poll_hotkey_buffer(key);  /* frees [bus_method]+[method] */
 801         kfree(key);
 802         printk(KERN_ERR PREFIX "invalid key\n");
 803         return -EINVAL;
 804 }
 805
 806 /*
 807  * This function evaluates an ACPI method, given an int as parameter, the
 808  * method is searched within the scope of the handle, can be NULL. The output
 809  * of the method is written is output, which can also be NULL
 810  *
 811  * returns 1 if write is successful, 0 else.
 812  */
 813 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 814                           struct acpi_buffer *output)
 815 {
 816         struct acpi_object_list params; /* list of input parameters (an int here) */
 817         union acpi_object in_obj;       /* the only param we use */
 818         acpi_status status;
 819
 820         params.count = 1;
 821         params.pointer = &in_obj;
 822         in_obj.type = ACPI_TYPE_INTEGER;
 823         in_obj.integer.value = val;
 824
 825         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 826
 827         return (status == AE_OK);
 828 }
 829
 830 static int read_acpi_int(acpi_handle handle, const char *method,
 831                          union acpi_object *val)
 832 {
 833         struct acpi_buffer output;
 834         union acpi_object out_obj;
 835         acpi_status status;
 836
 837         output.length = sizeof(out_obj);
 838         output.pointer = &out_obj;
 839
 840         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 841         if (val) {
 842                 val->integer.value = out_obj.integer.value;
 843                 val->type = out_obj.type;
 844         } else
 845                 printk(KERN_ERR PREFIX "null val pointer\n");
 846         return ((status == AE_OK)
 847                      && (out_obj.type == ACPI_TYPE_INTEGER));
 848 }
 849
 850 static union acpi_hotkey *get_hotkey_by_event(struct
 851                                               acpi_hotkey_list
 852                                               *hotkey_list, int event)
 853 {
 854         struct list_head *entries;
 855
 856         list_for_each(entries, hotkey_list->entries) {
 857                 union acpi_hotkey *key =
 858                     container_of(entries, union acpi_hotkey, entries);
 859                 if (key->link.hotkey_standard_num == event) {
 860                         return (key);
 861                 }
 862         }
 863         return (NULL);
 864 }
 865
 866 /*
 867  * user call AML method interface:
 868  * Call convention:
 869  * echo "event_num: arg type : value"
 870  * example: echo "1:1:30" > /proc/acpi/action
 871  * Just support 1 integer arg passing to AML method
 872  */
 873
 874 static ssize_t hotkey_execute_aml_method(struct file *file,
 875                                          const char __user * buffer,
 876                                          size_t count, loff_t * data)
 877 {
 878         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
 879         char *arg;
 880         int event, method_type, type, value;
 881         union acpi_hotkey *key;
 882
 883
 884         arg = kzalloc(count + 1, GFP_KERNEL);
 885         if (!arg)
 886                 return -ENOMEM;
 887
 888         if (copy_from_user(arg, buffer, count)) {
 889                 kfree(arg);
 890                 printk(KERN_ERR PREFIX "Invalid argument 2\n");
 891                 return -EINVAL;
 892         }
 893
 894         if (sscanf(arg, "%d:%d:%d:%d", &event, &method_type, &type, &value) !=
 895             4) {
 896                 kfree(arg);
 897                 printk(KERN_ERR PREFIX "Invalid argument 3\n");
 898                 return -EINVAL;
 899         }
 900         kfree(arg);
 901         if (type == ACPI_TYPE_INTEGER) {
 902                 key = get_hotkey_by_event(hotkey_list, event);
 903                 if (!key)
 904                         goto do_fail;
 905                 if (IS_EVENT(event))
 906                         write_acpi_int(key->event_hotkey.action_handle,
 907                                        key->event_hotkey.action_method, value,
 908                                        NULL);
 909                 else if (IS_POLL(event)) {
 910                         if (method_type == POLL_METHOD)
 911                                 read_acpi_int(key->poll_hotkey.poll_handle,
 912                                               key->poll_hotkey.poll_method,
 913                                               key->poll_hotkey.poll_result);
 914                         else if (method_type == ACTION_METHOD)
 915                                 write_acpi_int(key->poll_hotkey.action_handle,
 916                                                key->poll_hotkey.action_method,
 917                                                value, NULL);
 918                         else
 919                                 goto do_fail;
 920
 921                 }
 922         } else {
 923                 printk(KERN_WARNING "Not supported\n");
 924                 return -EINVAL;
 925         }
 926         return count;
 927       do_fail:
 928         return -EINVAL;
 929
 930 }
 931
 932 static int __init hotkey_init(void)
 933 {
 934         int result;
 935         mode_t mode = S_IFREG | S_IRUGO | S_IWUGO;
 936
 937
 938         if (acpi_disabled)
 939                 return -ENODEV;
 940
 941         if (acpi_specific_hotkey_enabled) {
 942                 printk("Using specific hotkey driver\n");
 943                 return -ENODEV;
 944         }
 945
 946         hotkey_proc_dir = proc_mkdir(HOTKEY_PROC, acpi_root_dir);
 947         if (!hotkey_proc_dir) {
 948                 return (-ENODEV);
 949         }
 950         hotkey_proc_dir->owner = THIS_MODULE;
 951
 952         hotkey_config =
 953             create_proc_entry(HOTKEY_EV_CONFIG, mode, hotkey_proc_dir);
 954         if (!hotkey_config) {
 955                 goto do_fail1;
 956         } else {
 957                 hotkey_config->proc_fops = &hotkey_config_fops;
 958                 hotkey_config->data = &global_hotkey_list;
 959                 hotkey_config->owner = THIS_MODULE;
 960                 hotkey_config->uid = 0;
 961                 hotkey_config->gid = 0;
 962         }
 963
 964         hotkey_poll_config =
 965             create_proc_entry(HOTKEY_PL_CONFIG, mode, hotkey_proc_dir);
 966         if (!hotkey_poll_config) {
 967                 goto do_fail2;
 968         } else {
 969                 hotkey_poll_config->proc_fops = &hotkey_poll_config_fops;
 970                 hotkey_poll_config->data = &global_hotkey_list;
 971                 hotkey_poll_config->owner = THIS_MODULE;
 972                 hotkey_poll_config->uid = 0;
 973                 hotkey_poll_config->gid = 0;
 974         }
 975
 976         hotkey_action = create_proc_entry(HOTKEY_ACTION, mode, hotkey_proc_dir);
 977         if (!hotkey_action) {
 978                 goto do_fail3;
 979         } else {
 980                 hotkey_action->proc_fops = &hotkey_action_fops;
 981                 hotkey_action->owner = THIS_MODULE;
 982                 hotkey_action->uid = 0;
 983                 hotkey_action->gid = 0;
 984         }
 985
 986         hotkey_info = create_proc_entry(HOTKEY_INFO, mode, hotkey_proc_dir);
 987         if (!hotkey_info) {
 988                 goto do_fail4;
 989         } else {
 990                 hotkey_info->proc_fops = &hotkey_info_fops;
 991                 hotkey_info->owner = THIS_MODULE;
 992                 hotkey_info->uid = 0;
 993                 hotkey_info->gid = 0;
 994         }
 995
 996         result = acpi_bus_register_driver(&hotkey_driver);
 997         if (result < 0)
 998                 goto do_fail5;
 999         global_hotkey_list.count = 0;
1000         global_hotkey_list.entries = &hotkey_entries;
1001
1002         INIT_LIST_HEAD(&hotkey_entries);
1003
1004         return (0);
1005
1006       do_fail5:
1007         remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
1008       do_fail4:
1009         remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
1010       do_fail3:
1011         remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
1012       do_fail2:
1013         remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
1014       do_fail1:
1015         remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
1016         return (-ENODEV);
1017 }
1018
1019 static void __exit hotkey_exit(void)
1020 {
1021         struct list_head *entries, *next;
1022
1023
1024         list_for_each_safe(entries, next, global_hotkey_list.entries) {
1025                 union acpi_hotkey *key =
1026                     container_of(entries, union acpi_hotkey, entries);
1027
1028                 acpi_os_wait_events_complete(NULL);
1029                 list_del(&key->link.entries);
1030                 global_hotkey_list.count--;
1031                 free_hotkey_device(key);
1032         }
1033         acpi_bus_unregister_driver(&hotkey_driver);
1034         remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
1035         remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
1036         remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
1037         remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
1038         remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
1039         return;
1040 }
1041
1042 module_init(hotkey_init);
1043 module_exit(hotkey_exit);