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                 return_VALUE(-ENODEV);
 360         } else {
 361                 proc->proc_fops = &hotkey_polling_fops;
 362                 proc->owner = THIS_MODULE;
 363                 proc->data = device;
 364                 proc->uid = 0;
 365                 proc->gid = 0;
 366                 device->poll_hotkey.proc = proc;
 367         }
 368         return_VALUE(0);
 369 }
 370
 371 static int hotkey_add(union acpi_hotkey *device)
 372 {
 373         int status = 0;
 374         struct acpi_device *dev = NULL;
 375
 376         ACPI_FUNCTION_TRACE("hotkey_add");
 377
 378         if (device->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 379                 acpi_bus_get_device(device->event_hotkey.bus_handle, &dev);
 380                 status = acpi_install_notify_handler(dev->handle,
 381                                                      ACPI_DEVICE_NOTIFY,
 382                                                      acpi_hotkey_notify_handler,
 383                                                      dev);
 384         } else                  /* Add polling hotkey */
 385                 create_polling_proc(device);
 386
 387         global_hotkey_list.count++;
 388
 389         list_add_tail(&device->link.entries, global_hotkey_list.entries);
 390
 391         return_VALUE(status);
 392 }
 393
 394 static int hotkey_remove(union acpi_hotkey *device)
 395 {
 396         struct list_head *entries, *next;
 397
 398         ACPI_FUNCTION_TRACE("hotkey_remove");
 399
 400         list_for_each_safe(entries, next, global_hotkey_list.entries) {
 401                 union acpi_hotkey *key =
 402                     container_of(entries, union acpi_hotkey, entries);
 403                 if (key->link.hotkey_standard_num ==
 404                     device->link.hotkey_standard_num) {
 405                         list_del(&key->link.entries);
 406                         free_hotkey_device(key);
 407                         global_hotkey_list.count--;
 408                         break;
 409                 }
 410         }
 411         kfree(device);
 412         return_VALUE(0);
 413 }
 414
 415 static int hotkey_update(union acpi_hotkey *key)
 416 {
 417         struct list_head *entries;
 418
 419         ACPI_FUNCTION_TRACE("hotkey_update");
 420
 421         list_for_each(entries, global_hotkey_list.entries) {
 422                 union acpi_hotkey *tmp =
 423                     container_of(entries, union acpi_hotkey, entries);
 424                 if (tmp->link.hotkey_standard_num ==
 425                     key->link.hotkey_standard_num) {
 426                         if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 427                                 free_hotkey_buffer(tmp);
 428                                 tmp->event_hotkey.bus_handle =
 429                                     key->event_hotkey.bus_handle;
 430                                 tmp->event_hotkey.external_hotkey_num =
 431                                     key->event_hotkey.external_hotkey_num;
 432                                 tmp->event_hotkey.action_handle =
 433                                     key->event_hotkey.action_handle;
 434                                 tmp->event_hotkey.action_method =
 435                                     key->event_hotkey.action_method;
 436                                 kfree(key);
 437                         } else {
 438                                 /*
 439                                    char  proc_name[80];
 440
 441                                    sprintf(proc_name, "%d", tmp->link.hotkey_standard_num);
 442                                    strcat(proc_name, tmp->poll_hotkey.poll_method);
 443                                    remove_proc_entry(proc_name,hotkey_proc_dir);
 444                                  */
 445                                 free_poll_hotkey_buffer(tmp);
 446                                 tmp->poll_hotkey.poll_handle =
 447                                     key->poll_hotkey.poll_handle;
 448                                 tmp->poll_hotkey.poll_method =
 449                                     key->poll_hotkey.poll_method;
 450                                 tmp->poll_hotkey.action_handle =
 451                                     key->poll_hotkey.action_handle;
 452                                 tmp->poll_hotkey.action_method =
 453                                     key->poll_hotkey.action_method;
 454                                 tmp->poll_hotkey.poll_result =
 455                                     key->poll_hotkey.poll_result;
 456                                 /*
 457                                    create_polling_proc(tmp);
 458                                  */
 459                                 kfree(key);
 460                         }
 461                         return_VALUE(0);
 462                         break;
 463                 }
 464         }
 465
 466         return_VALUE(-ENODEV);
 467 }
 468
 469 static void free_hotkey_device(union acpi_hotkey *key)
 470 {
 471         struct acpi_device *dev;
 472
 473         ACPI_FUNCTION_TRACE("free_hotkey_device");
 474
 475         if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 476                 acpi_bus_get_device(key->event_hotkey.bus_handle, &dev);
 477                 if (dev->handle)
 478                         acpi_remove_notify_handler(dev->handle,
 479                                                    ACPI_DEVICE_NOTIFY,
 480                                                    acpi_hotkey_notify_handler);
 481                 free_hotkey_buffer(key);
 482         } else {
 483                 char proc_name[80];
 484
 485                 sprintf(proc_name, "%d", key->link.hotkey_standard_num);
 486                 /*
 487                    strcat(proc_name, key->poll_hotkey.poll_method);
 488                  */
 489                 remove_proc_entry(proc_name, hotkey_proc_dir);
 490                 free_poll_hotkey_buffer(key);
 491         }
 492         kfree(key);
 493         return_VOID;
 494 }
 495
 496 static void free_hotkey_buffer(union acpi_hotkey *key)
 497 {
 498         kfree(key->event_hotkey.action_method);
 499 }
 500
 501 static void free_poll_hotkey_buffer(union acpi_hotkey *key)
 502 {
 503         kfree(key->poll_hotkey.action_method);
 504         kfree(key->poll_hotkey.poll_method);
 505         kfree(key->poll_hotkey.poll_result);
 506 }
 507 static int
 508 init_hotkey_device(union acpi_hotkey *key, char *bus_str, char *action_str,
 509                    char *method, int std_num, int external_num)
 510 {
 511         acpi_handle tmp_handle;
 512         acpi_status status = AE_OK;
 513
 514         ACPI_FUNCTION_TRACE("init_hotkey_device");
 515
 516         if (std_num < 0 || IS_POLL(std_num) || !key)
 517                 goto do_fail;
 518
 519         if (!bus_str || !action_str || !method)
 520                 goto do_fail;
 521
 522         key->link.hotkey_type = ACPI_HOTKEY_EVENT;
 523         key->link.hotkey_standard_num = std_num;
 524         key->event_hotkey.flag = 0;
 525         key->event_hotkey.action_method = method;
 526
 527         status =
 528             acpi_get_handle(NULL, bus_str, &(key->event_hotkey.bus_handle));
 529         if (ACPI_FAILURE(status))
 530                 goto do_fail;
 531         key->event_hotkey.external_hotkey_num = external_num;
 532         status =
 533             acpi_get_handle(NULL, action_str,
 534                             &(key->event_hotkey.action_handle));
 535         if (ACPI_FAILURE(status))
 536                 goto do_fail;
 537         status = acpi_get_handle(key->event_hotkey.action_handle,
 538                                  method, &tmp_handle);
 539         if (ACPI_FAILURE(status))
 540                 goto do_fail;
 541         return_VALUE(AE_OK);
 542       do_fail:
 543         return_VALUE(-ENODEV);
 544 }
 545
 546 static int
 547 init_poll_hotkey_device(union acpi_hotkey *key,
 548                         char *poll_str,
 549                         char *poll_method,
 550                         char *action_str, char *action_method, int std_num)
 551 {
 552         acpi_status status = AE_OK;
 553         acpi_handle tmp_handle;
 554
 555         ACPI_FUNCTION_TRACE("init_poll_hotkey_device");
 556
 557         if (std_num < 0 || IS_EVENT(std_num) || !key)
 558                 goto do_fail;
 559
 560         if (!poll_str || !poll_method || !action_str || !action_method)
 561                 goto do_fail;
 562
 563         key->link.hotkey_type = ACPI_HOTKEY_POLLING;
 564         key->link.hotkey_standard_num = std_num;
 565         key->poll_hotkey.flag = 0;
 566         key->poll_hotkey.poll_method = poll_method;
 567         key->poll_hotkey.action_method = action_method;
 568
 569         status =
 570             acpi_get_handle(NULL, poll_str, &(key->poll_hotkey.poll_handle));
 571         if (ACPI_FAILURE(status))
 572                 goto do_fail;
 573         status = acpi_get_handle(key->poll_hotkey.poll_handle,
 574                                  poll_method, &tmp_handle);
 575         if (ACPI_FAILURE(status))
 576                 goto do_fail;
 577         status =
 578             acpi_get_handle(NULL, action_str,
 579                             &(key->poll_hotkey.action_handle));
 580         if (ACPI_FAILURE(status))
 581                 goto do_fail;
 582         status = acpi_get_handle(key->poll_hotkey.action_handle,
 583                                  action_method, &tmp_handle);
 584         if (ACPI_FAILURE(status))
 585                 goto do_fail;
 586         key->poll_hotkey.poll_result =
 587             (union acpi_object *)kmalloc(sizeof(union acpi_object), GFP_KERNEL);
 588         if (!key->poll_hotkey.poll_result)
 589                 goto do_fail;
 590         return_VALUE(AE_OK);
 591       do_fail:
 592         return_VALUE(-ENODEV);
 593 }
 594
 595 static int hotkey_open_config(struct inode *inode, struct file *file)
 596 {
 597         ACPI_FUNCTION_TRACE("hotkey_open_config");
 598         return_VALUE(single_open
 599                      (file, hotkey_config_seq_show, PDE(inode)->data));
 600 }
 601
 602 static int hotkey_poll_open_config(struct inode *inode, struct file *file)
 603 {
 604         ACPI_FUNCTION_TRACE("hotkey_poll_open_config");
 605         return_VALUE(single_open
 606                      (file, hotkey_poll_config_seq_show, PDE(inode)->data));
 607 }
 608
 609 static int hotkey_config_seq_show(struct seq_file *seq, void *offset)
 610 {
 611         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
 612         struct list_head *entries;
 613         char bus_name[ACPI_PATHNAME_MAX] = { 0 };
 614         char action_name[ACPI_PATHNAME_MAX] = { 0 };
 615         struct acpi_buffer bus = { ACPI_PATHNAME_MAX, bus_name };
 616         struct acpi_buffer act = { ACPI_PATHNAME_MAX, action_name };
 617
 618         ACPI_FUNCTION_TRACE(("hotkey_config_seq_show"));
 619
 620         list_for_each(entries, hotkey_list->entries) {
 621                 union acpi_hotkey *key =
 622                     container_of(entries, union acpi_hotkey, entries);
 623                 if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
 624                         acpi_get_name(key->event_hotkey.bus_handle,
 625                                       ACPI_NAME_TYPE_MAX, &bus);
 626                         acpi_get_name(key->event_hotkey.action_handle,
 627                                       ACPI_NAME_TYPE_MAX, &act);
 628                         seq_printf(seq, "%s:%s:%s:%d:%d\n", bus_name,
 629                                    action_name,
 630                                    key->event_hotkey.action_method,
 631                                    key->link.hotkey_standard_num,
 632                                    key->event_hotkey.external_hotkey_num);
 633                 }
 634         }
 635         seq_puts(seq, "\n");
 636         return_VALUE(0);
 637 }
 638
 639 static int hotkey_poll_config_seq_show(struct seq_file *seq, void *offset)
 640 {
 641         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
 642         struct list_head *entries;
 643         char bus_name[ACPI_PATHNAME_MAX] = { 0 };
 644         char action_name[ACPI_PATHNAME_MAX] = { 0 };
 645         struct acpi_buffer bus = { ACPI_PATHNAME_MAX, bus_name };
 646         struct acpi_buffer act = { ACPI_PATHNAME_MAX, action_name };
 647
 648         ACPI_FUNCTION_TRACE(("hotkey_config_seq_show"));
 649
 650         list_for_each(entries, hotkey_list->entries) {
 651                 union acpi_hotkey *key =
 652                     container_of(entries, union acpi_hotkey, entries);
 653                 if (key->link.hotkey_type == ACPI_HOTKEY_POLLING) {
 654                         acpi_get_name(key->poll_hotkey.poll_handle,
 655                                       ACPI_NAME_TYPE_MAX, &bus);
 656                         acpi_get_name(key->poll_hotkey.action_handle,
 657                                       ACPI_NAME_TYPE_MAX, &act);
 658                         seq_printf(seq, "%s:%s:%s:%s:%d\n", bus_name,
 659                                    key->poll_hotkey.poll_method,
 660                                    action_name,
 661                                    key->poll_hotkey.action_method,
 662                                    key->link.hotkey_standard_num);
 663                 }
 664         }
 665         seq_puts(seq, "\n");
 666         return_VALUE(0);
 667 }
 668
 669 static int
 670 get_parms(char *config_record,
 671           int *cmd,
 672           char **bus_handle,
 673           char **bus_method,
 674           char **action_handle,
 675           char **method, int *internal_event_num, int *external_event_num)
 676 {
 677         char *tmp, *tmp1, count;
 678         ACPI_FUNCTION_TRACE(("get_parms"));
 679
 680         sscanf(config_record, "%d", cmd);
 681
 682         if (*cmd == 1) {
 683                 if (sscanf(config_record, "%d:%d", cmd, internal_event_num) !=
 684                     2)
 685                         goto do_fail;
 686                 else
 687                         return (6);
 688         }
 689         tmp = strchr(config_record, ':');
 690         if (!tmp)
 691                 goto do_fail;
 692         tmp++;
 693         tmp1 = strchr(tmp, ':');
 694         if (!tmp1)
 695                 goto do_fail;
 696
 697         count = tmp1 - tmp;
 698         *bus_handle = (char *)kmalloc(count + 1, GFP_KERNEL);
 699         if (!*bus_handle)
 700                 goto do_fail;
 701         strncpy(*bus_handle, tmp, count);
 702         *(*bus_handle + count) = 0;
 703
 704         tmp = tmp1;
 705         tmp++;
 706         tmp1 = strchr(tmp, ':');
 707         if (!tmp1)
 708                 goto do_fail;
 709         count = tmp1 - tmp;
 710         *bus_method = (char *)kmalloc(count + 1, GFP_KERNEL);
 711         if (!*bus_method)
 712                 goto do_fail;
 713         strncpy(*bus_method, tmp, count);
 714         *(*bus_method + count) = 0;
 715
 716         tmp = tmp1;
 717         tmp++;
 718         tmp1 = strchr(tmp, ':');
 719         if (!tmp1)
 720                 goto do_fail;
 721         count = tmp1 - tmp;
 722         *action_handle = (char *)kmalloc(count + 1, GFP_KERNEL);
 723         if (!*action_handle)
 724                 goto do_fail;
 725         strncpy(*action_handle, tmp, count);
 726         *(*action_handle + count) = 0;
 727
 728         tmp = tmp1;
 729         tmp++;
 730         tmp1 = strchr(tmp, ':');
 731         if (!tmp1)
 732                 goto do_fail;
 733         count = tmp1 - tmp;
 734         *method = (char *)kmalloc(count + 1, GFP_KERNEL);
 735         if (!*method)
 736                 goto do_fail;
 737         strncpy(*method, tmp, count);
 738         *(*method + count) = 0;
 739
 740         if (sscanf(tmp1 + 1, "%d:%d", internal_event_num, external_event_num) <=
 741             0)
 742                 goto do_fail;
 743
 744         return_VALUE(6);
 745       do_fail:
 746         return_VALUE(-1);
 747 }
 748
 749 /*  count is length for one input record */
 750 static ssize_t hotkey_write_config(struct file *file,
 751                                    const char __user * buffer,
 752                                    size_t count, loff_t * data)
 753 {
 754         char *config_record = NULL;
 755         char *bus_handle = NULL;
 756         char *bus_method = NULL;
 757         char *action_handle = NULL;
 758         char *method = NULL;
 759         int cmd, internal_event_num, external_event_num;
 760         int ret = 0;
 761         union acpi_hotkey *key = NULL;
 762
 763         ACPI_FUNCTION_TRACE(("hotkey_write_config"));
 764
 765         config_record = (char *)kmalloc(count + 1, GFP_KERNEL);
 766         if (!config_record)
 767                 return_VALUE(-ENOMEM);
 768
 769         if (copy_from_user(config_record, buffer, count)) {
 770                 kfree(config_record);
 771                 printk(KERN_ERR PREFIX "Invalid data\n");
 772                 return_VALUE(-EINVAL);
 773         }
 774         config_record[count] = 0;
 775
 776         ret = get_parms(config_record,
 777                         &cmd,
 778                         &bus_handle,
 779                         &bus_method,
 780                         &action_handle,
 781                         &method, &internal_event_num, &external_event_num);
 782
 783         kfree(config_record);
 784         if (IS_OTHERS(internal_event_num))
 785                 goto do_fail;
 786         if (ret != 6) {
 787               do_fail:
 788                 kfree(bus_handle);
 789                 kfree(bus_method);
 790                 kfree(action_handle);
 791                 kfree(method);
 792                 printk(KERN_ERR PREFIX "Invalid data format ret=%d\n", ret);
 793                 return_VALUE(-EINVAL);
 794         }
 795
 796         key = kmalloc(sizeof(union acpi_hotkey), GFP_KERNEL);
 797         if (!key)
 798                 goto do_fail;
 799         memset(key, 0, sizeof(union acpi_hotkey));
 800         if (cmd == 1) {
 801                 union acpi_hotkey *tmp = NULL;
 802                 tmp = get_hotkey_by_event(&global_hotkey_list,
 803                                           internal_event_num);
 804                 if (!tmp)
 805                         printk(KERN_ERR PREFIX "Invalid key\n");
 806                 else
 807                         memcpy(key, tmp, sizeof(union acpi_hotkey));
 808                 goto cont_cmd;
 809         }
 810         if (IS_EVENT(internal_event_num)) {
 811                 kfree(bus_method);
 812                 ret = init_hotkey_device(key, bus_handle, action_handle, method,
 813                                          internal_event_num,
 814                                          external_event_num);
 815         } else
 816                 ret = init_poll_hotkey_device(key, bus_handle, bus_method,
 817                                               action_handle, method,
 818                                               internal_event_num);
 819         if (ret) {
 820                 kfree(bus_handle);
 821                 kfree(action_handle);
 822                 if (IS_EVENT(internal_event_num))
 823                         free_hotkey_buffer(key);
 824                 else
 825                         free_poll_hotkey_buffer(key);
 826                 kfree(key);
 827                 printk(KERN_ERR PREFIX "Invalid hotkey\n");
 828                 return_VALUE(-EINVAL);
 829         }
 830
 831       cont_cmd:
 832         kfree(bus_handle);
 833         kfree(action_handle);
 834
 835         switch (cmd) {
 836         case 0:
 837                 if (get_hotkey_by_event
 838                     (&global_hotkey_list, key->link.hotkey_standard_num))
 839                         goto fail_out;
 840                 else
 841                         hotkey_add(key);
 842                 break;
 843         case 1:
 844                 hotkey_remove(key);
 845                 break;
 846         case 2:
 847                 if (hotkey_update(key))
 848                         goto fail_out;
 849                 break;
 850         default:
 851                 goto fail_out;
 852                 break;
 853         }
 854         return_VALUE(count);
 855       fail_out:
 856         if (IS_EVENT(internal_event_num))
 857                 free_hotkey_buffer(key);
 858         else
 859                 free_poll_hotkey_buffer(key);
 860         kfree(key);
 861         printk(KERN_ERR PREFIX "invalid key\n");
 862         return_VALUE(-EINVAL);
 863 }
 864
 865 /*
 866  * This function evaluates an ACPI method, given an int as parameter, the
 867  * method is searched within the scope of the handle, can be NULL. The output
 868  * of the method is written is output, which can also be NULL
 869  *
 870  * returns 1 if write is successful, 0 else.
 871  */
 872 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 873                           struct acpi_buffer *output)
 874 {
 875         struct acpi_object_list params; /* list of input parameters (an int here) */
 876         union acpi_object in_obj;       /* the only param we use */
 877         acpi_status status;
 878
 879         ACPI_FUNCTION_TRACE("write_acpi_int");
 880         params.count = 1;
 881         params.pointer = &in_obj;
 882         in_obj.type = ACPI_TYPE_INTEGER;
 883         in_obj.integer.value = val;
 884
 885         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 886
 887         return_VALUE(status == AE_OK);
 888 }
 889
 890 static int read_acpi_int(acpi_handle handle, const char *method,
 891                          union acpi_object *val)
 892 {
 893         struct acpi_buffer output;
 894         union acpi_object out_obj;
 895         acpi_status status;
 896
 897         ACPI_FUNCTION_TRACE("read_acpi_int");
 898         output.length = sizeof(out_obj);
 899         output.pointer = &out_obj;
 900
 901         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 902         if (val) {
 903                 val->integer.value = out_obj.integer.value;
 904                 val->type = out_obj.type;
 905         } else
 906                 printk(KERN_ERR PREFIX "null val pointer\n");
 907         return_VALUE((status == AE_OK)
 908                      && (out_obj.type == ACPI_TYPE_INTEGER));
 909 }
 910
 911 static union acpi_hotkey *get_hotkey_by_event(struct
 912                                               acpi_hotkey_list
 913                                               *hotkey_list, int event)
 914 {
 915         struct list_head *entries;
 916
 917         list_for_each(entries, hotkey_list->entries) {
 918                 union acpi_hotkey *key =
 919                     container_of(entries, union acpi_hotkey, entries);
 920                 if (key->link.hotkey_standard_num == event) {
 921                         return (key);
 922                 }
 923         }
 924         return (NULL);
 925 }
 926
 927 /*
 928  * user call AML method interface:
 929  * Call convention:
 930  * echo "event_num: arg type : value"
 931  * example: echo "1:1:30" > /proc/acpi/action
 932  * Just support 1 integer arg passing to AML method
 933  */
 934
 935 static ssize_t hotkey_execute_aml_method(struct file *file,
 936                                          const char __user * buffer,
 937                                          size_t count, loff_t * data)
 938 {
 939         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
 940         char *arg;
 941         int event, method_type, type, value;
 942         union acpi_hotkey *key;
 943
 944         ACPI_FUNCTION_TRACE("hotkey_execte_aml_method");
 945
 946         arg = (char *)kmalloc(count + 1, GFP_KERNEL);
 947         if (!arg)
 948                 return_VALUE(-ENOMEM);
 949         arg[count] = 0;
 950
 951         if (copy_from_user(arg, buffer, count)) {
 952                 kfree(arg);
 953                 printk(KERN_ERR PREFIX "Invalid argument 2\n");
 954                 return_VALUE(-EINVAL);
 955         }
 956
 957         if (sscanf(arg, "%d:%d:%d:%d", &event, &method_type, &type, &value) !=
 958             4) {
 959                 kfree(arg);
 960                 printk(KERN_ERR PREFIX "Invalid argument 3\n");
 961                 return_VALUE(-EINVAL);
 962         }
 963         kfree(arg);
 964         if (type == ACPI_TYPE_INTEGER) {
 965                 key = get_hotkey_by_event(hotkey_list, event);
 966                 if (!key)
 967                         goto do_fail;
 968                 if (IS_EVENT(event))
 969                         write_acpi_int(key->event_hotkey.action_handle,
 970                                        key->event_hotkey.action_method, value,
 971                                        NULL);
 972                 else if (IS_POLL(event)) {
 973                         if (method_type == POLL_METHOD)
 974                                 read_acpi_int(key->poll_hotkey.poll_handle,
 975                                               key->poll_hotkey.poll_method,
 976                                               key->poll_hotkey.poll_result);
 977                         else if (method_type == ACTION_METHOD)
 978                                 write_acpi_int(key->poll_hotkey.action_handle,
 979                                                key->poll_hotkey.action_method,
 980                                                value, NULL);
 981                         else
 982                                 goto do_fail;
 983
 984                 }
 985         } else {
 986                 printk(KERN_WARNING "Not supported\n");
 987                 return_VALUE(-EINVAL);
 988         }
 989         return_VALUE(count);
 990       do_fail:
 991         return_VALUE(-EINVAL);
 992
 993 }
 994
 995 static int __init hotkey_init(void)
 996 {
 997         int result;
 998         mode_t mode = S_IFREG | S_IRUGO | S_IWUGO;
 999
1000         ACPI_FUNCTION_TRACE("hotkey_init");
1001
1002         if (acpi_disabled)
1003                 return -ENODEV;
1004
1005         if (acpi_specific_hotkey_enabled) {
1006                 printk("Using specific hotkey driver\n");
1007                 return -ENODEV;
1008         }
1009
1010         hotkey_proc_dir = proc_mkdir(HOTKEY_PROC, acpi_root_dir);
1011         if (!hotkey_proc_dir) {
1012                 return (-ENODEV);
1013         }
1014         hotkey_proc_dir->owner = THIS_MODULE;
1015
1016         hotkey_config =
1017             create_proc_entry(HOTKEY_EV_CONFIG, mode, hotkey_proc_dir);
1018         if (!hotkey_config) {
1019                 goto do_fail1;
1020         } else {
1021                 hotkey_config->proc_fops = &hotkey_config_fops;
1022                 hotkey_config->data = &global_hotkey_list;
1023                 hotkey_config->owner = THIS_MODULE;
1024                 hotkey_config->uid = 0;
1025                 hotkey_config->gid = 0;
1026         }
1027
1028         hotkey_poll_config =
1029             create_proc_entry(HOTKEY_PL_CONFIG, mode, hotkey_proc_dir);
1030         if (!hotkey_poll_config) {
1031                 goto do_fail2;
1032         } else {
1033                 hotkey_poll_config->proc_fops = &hotkey_poll_config_fops;
1034                 hotkey_poll_config->data = &global_hotkey_list;
1035                 hotkey_poll_config->owner = THIS_MODULE;
1036                 hotkey_poll_config->uid = 0;
1037                 hotkey_poll_config->gid = 0;
1038         }
1039
1040         hotkey_action = create_proc_entry(HOTKEY_ACTION, mode, hotkey_proc_dir);
1041         if (!hotkey_action) {
1042                 goto do_fail3;
1043         } else {
1044                 hotkey_action->proc_fops = &hotkey_action_fops;
1045                 hotkey_action->owner = THIS_MODULE;
1046                 hotkey_action->uid = 0;
1047                 hotkey_action->gid = 0;
1048         }
1049
1050         hotkey_info = create_proc_entry(HOTKEY_INFO, mode, hotkey_proc_dir);
1051         if (!hotkey_info) {
1052                 goto do_fail4;
1053         } else {
1054                 hotkey_info->proc_fops = &hotkey_info_fops;
1055                 hotkey_info->owner = THIS_MODULE;
1056                 hotkey_info->uid = 0;
1057                 hotkey_info->gid = 0;
1058         }
1059
1060         result = acpi_bus_register_driver(&hotkey_driver);
1061         if (result < 0)
1062                 goto do_fail5;
1063         global_hotkey_list.count = 0;
1064         global_hotkey_list.entries = &hotkey_entries;
1065
1066         INIT_LIST_HEAD(&hotkey_entries);
1067
1068         return (0);
1069
1070       do_fail5:
1071         remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
1072       do_fail4:
1073         remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
1074       do_fail3:
1075         remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
1076       do_fail2:
1077         remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
1078       do_fail1:
1079         remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
1080         return (-ENODEV);
1081 }
1082
1083 static void __exit hotkey_exit(void)
1084 {
1085         struct list_head *entries, *next;
1086
1087         ACPI_FUNCTION_TRACE("hotkey_exit");
1088
1089         list_for_each_safe(entries, next, global_hotkey_list.entries) {
1090                 union acpi_hotkey *key =
1091                     container_of(entries, union acpi_hotkey, entries);
1092
1093                 acpi_os_wait_events_complete(NULL);
1094                 list_del(&key->link.entries);
1095                 global_hotkey_list.count--;
1096                 free_hotkey_device(key);
1097         }
1098         acpi_bus_unregister_driver(&hotkey_driver);
1099         remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
1100         remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
1101         remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
1102         remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
1103         remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
1104         return;
1105 }
1106
1107 module_init(hotkey_init);
1108 module_exit(hotkey_exit);