sound/core/jack.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Jack abstraction layer
   4  *
   5  *  Copyright 2008 Wolfson Microelectronics
   6  */
   7
   8 #include <linux/input.h>
   9 #include <linux/slab.h>
  10 #include <linux/module.h>
  11 #include <linux/ctype.h>
  12 #include <linux/mm.h>
  13 #include <linux/debugfs.h>
  14 #include <sound/jack.h>
  15 #include <sound/core.h>
  16 #include <sound/control.h>
  17
  18 struct snd_jack_kctl {
  19         struct snd_kcontrol *kctl;
  20         struct list_head list;  /* list of controls belong to the same jack */
  21         unsigned int mask_bits; /* only masked status bits are reported via kctl */
  22         struct snd_jack *jack;  /* pointer to struct snd_jack */
  23         bool sw_inject_enable;  /* allow to inject plug event via debugfs */
  24 #ifdef CONFIG_SND_JACK_INJECTION_DEBUG
  25         struct dentry *jack_debugfs_root; /* jack_kctl debugfs root */
  26 #endif
  27 };
  28
  29 #ifdef CONFIG_SND_JACK_INPUT_DEV
  30 static const int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
  31         SW_HEADPHONE_INSERT,
  32         SW_MICROPHONE_INSERT,
  33         SW_LINEOUT_INSERT,
  34         SW_JACK_PHYSICAL_INSERT,
  35         SW_VIDEOOUT_INSERT,
  36         SW_LINEIN_INSERT,
  37 };
  38 #endif /* CONFIG_SND_JACK_INPUT_DEV */
  39
  40 static int snd_jack_dev_disconnect(struct snd_device *device)
  41 {
  42 #ifdef CONFIG_SND_JACK_INPUT_DEV
  43         struct snd_jack *jack = device->device_data;
  44
  45         if (!jack->input_dev)
  46                 return 0;
  47
  48         /* If the input device is registered with the input subsystem
  49          * then we need to use a different deallocator. */
  50         if (jack->registered)
  51                 input_unregister_device(jack->input_dev);
  52         else
  53                 input_free_device(jack->input_dev);
  54         jack->input_dev = NULL;
  55 #endif /* CONFIG_SND_JACK_INPUT_DEV */
  56         return 0;
  57 }
  58
  59 static int snd_jack_dev_free(struct snd_device *device)
  60 {
  61         struct snd_jack *jack = device->device_data;
  62         struct snd_card *card = device->card;
  63         struct snd_jack_kctl *jack_kctl, *tmp_jack_kctl;
  64
  65         list_for_each_entry_safe(jack_kctl, tmp_jack_kctl, &jack->kctl_list, list) {
  66                 list_del_init(&jack_kctl->list);
  67                 snd_ctl_remove(card, jack_kctl->kctl);
  68         }
  69         if (jack->private_free)
  70                 jack->private_free(jack);
  71
  72         snd_jack_dev_disconnect(device);
  73
  74         kfree(jack->id);
  75         kfree(jack);
  76
  77         return 0;
  78 }
  79
  80 #ifdef CONFIG_SND_JACK_INPUT_DEV
  81 static int snd_jack_dev_register(struct snd_device *device)
  82 {
  83         struct snd_jack *jack = device->device_data;
  84         struct snd_card *card = device->card;
  85         int err, i;
  86
  87         snprintf(jack->name, sizeof(jack->name), "%s %s",
  88                  card->shortname, jack->id);
  89
  90         if (!jack->input_dev)
  91                 return 0;
  92
  93         jack->input_dev->name = jack->name;
  94
  95         /* Default to the sound card device. */
  96         if (!jack->input_dev->dev.parent)
  97                 jack->input_dev->dev.parent = snd_card_get_device_link(card);
  98
  99         /* Add capabilities for any keys that are enabled */
 100         for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
 101                 int testbit = SND_JACK_BTN_0 >> i;
 102
 103                 if (!(jack->type & testbit))
 104                         continue;
 105
 106                 if (!jack->key[i])
 107                         jack->key[i] = BTN_0 + i;
 108
 109                 input_set_capability(jack->input_dev, EV_KEY, jack->key[i]);
 110         }
 111
 112         err = input_register_device(jack->input_dev);
 113         if (err == 0)
 114                 jack->registered = 1;
 115
 116         return err;
 117 }
 118 #endif /* CONFIG_SND_JACK_INPUT_DEV */
 119
 120 #ifdef CONFIG_SND_JACK_INJECTION_DEBUG
 121 static void snd_jack_inject_report(struct snd_jack_kctl *jack_kctl, int status)
 122 {
 123         struct snd_jack *jack;
 124 #ifdef CONFIG_SND_JACK_INPUT_DEV
 125         int i;
 126 #endif
 127         if (!jack_kctl)
 128                 return;
 129
 130         jack = jack_kctl->jack;
 131
 132         if (jack_kctl->sw_inject_enable)
 133                 snd_kctl_jack_report(jack->card, jack_kctl->kctl,
 134                                      status & jack_kctl->mask_bits);
 135
 136 #ifdef CONFIG_SND_JACK_INPUT_DEV
 137         if (!jack->input_dev)
 138                 return;
 139
 140         for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
 141                 int testbit = ((SND_JACK_BTN_0 >> i) & jack_kctl->mask_bits);
 142
 143                 if (jack->type & testbit)
 144                         input_report_key(jack->input_dev, jack->key[i],
 145                                          status & testbit);
 146         }
 147
 148         for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
 149                 int testbit = ((1 << i) & jack_kctl->mask_bits);
 150
 151                 if (jack->type & testbit)
 152                         input_report_switch(jack->input_dev,
 153                                             jack_switch_types[i],
 154                                             status & testbit);
 155         }
 156
 157         input_sync(jack->input_dev);
 158 #endif /* CONFIG_SND_JACK_INPUT_DEV */
 159 }
 160
 161 static ssize_t sw_inject_enable_read(struct file *file,
 162                                      char __user *to, size_t count, loff_t *ppos)
 163 {
 164         struct snd_jack_kctl *jack_kctl = file->private_data;
 165         int len, ret;
 166         char buf[128];
 167
 168         len = scnprintf(buf, sizeof(buf), "%s: %s\t\t%s: %i\n", "Jack", jack_kctl->kctl->id.name,
 169                         "Inject Enabled", jack_kctl->sw_inject_enable);
 170         ret = simple_read_from_buffer(to, count, ppos, buf, len);
 171
 172         return ret;
 173 }
 174
 175 static ssize_t sw_inject_enable_write(struct file *file,
 176                                       const char __user *from, size_t count, loff_t *ppos)
 177 {
 178         struct snd_jack_kctl *jack_kctl = file->private_data;
 179         int ret, err;
 180         unsigned long enable;
 181         char buf[8] = { 0 };
 182
 183         ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, from, count);
 184         err = kstrtoul(buf, 0, &enable);
 185         if (err)
 186                 return err;
 187
 188         if (jack_kctl->sw_inject_enable == (!!enable))
 189                 return ret;
 190
 191         jack_kctl->sw_inject_enable = !!enable;
 192
 193         if (!jack_kctl->sw_inject_enable)
 194                 snd_jack_report(jack_kctl->jack, jack_kctl->jack->hw_status_cache);
 195
 196         return ret;
 197 }
 198
 199 static ssize_t jackin_inject_write(struct file *file,
 200                                    const char __user *from, size_t count, loff_t *ppos)
 201 {
 202         struct snd_jack_kctl *jack_kctl = file->private_data;
 203         int ret, err;
 204         unsigned long enable;
 205         char buf[8] = { 0 };
 206
 207         if (!jack_kctl->sw_inject_enable)
 208                 return -EINVAL;
 209
 210         ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, from, count);
 211         err = kstrtoul(buf, 0, &enable);
 212         if (err)
 213                 return err;
 214
 215         snd_jack_inject_report(jack_kctl, !!enable ? jack_kctl->mask_bits : 0);
 216
 217         return ret;
 218 }
 219
 220 static ssize_t jack_kctl_id_read(struct file *file,
 221                                  char __user *to, size_t count, loff_t *ppos)
 222 {
 223         struct snd_jack_kctl *jack_kctl = file->private_data;
 224         char buf[64];
 225         int len, ret;
 226
 227         len = scnprintf(buf, sizeof(buf), "%s\n", jack_kctl->kctl->id.name);
 228         ret = simple_read_from_buffer(to, count, ppos, buf, len);
 229
 230         return ret;
 231 }
 232
 233 /* the bit definition is aligned with snd_jack_types in jack.h */
 234 static const char * const jack_events_name[] = {
 235         "HEADPHONE(0x0001)", "MICROPHONE(0x0002)", "LINEOUT(0x0004)",
 236         "MECHANICAL(0x0008)", "VIDEOOUT(0x0010)", "LINEIN(0x0020)",
 237         "", "", "", "BTN_5(0x0200)", "BTN_4(0x0400)", "BTN_3(0x0800)",
 238         "BTN_2(0x1000)", "BTN_1(0x2000)", "BTN_0(0x4000)", "",
 239 };
 240
 241 /* the recommended buffer size is 256 */
 242 static int parse_mask_bits(unsigned int mask_bits, char *buf, size_t buf_size)
 243 {
 244         int i;
 245
 246         scnprintf(buf, buf_size, "0x%04x", mask_bits);
 247
 248         for (i = 0; i < ARRAY_SIZE(jack_events_name); i++)
 249                 if (mask_bits & (1 << i)) {
 250                         strlcat(buf, " ", buf_size);
 251                         strlcat(buf, jack_events_name[i], buf_size);
 252                 }
 253         strlcat(buf, "\n", buf_size);
 254
 255         return strlen(buf);
 256 }
 257
 258 static ssize_t jack_kctl_mask_bits_read(struct file *file,
 259                                         char __user *to, size_t count, loff_t *ppos)
 260 {
 261         struct snd_jack_kctl *jack_kctl = file->private_data;
 262         char buf[256];
 263         int len, ret;
 264
 265         len = parse_mask_bits(jack_kctl->mask_bits, buf, sizeof(buf));
 266         ret = simple_read_from_buffer(to, count, ppos, buf, len);
 267
 268         return ret;
 269 }
 270
 271 static ssize_t jack_kctl_status_read(struct file *file,
 272                                      char __user *to, size_t count, loff_t *ppos)
 273 {
 274         struct snd_jack_kctl *jack_kctl = file->private_data;
 275         char buf[16];
 276         int len, ret;
 277
 278         len = scnprintf(buf, sizeof(buf), "%s\n", jack_kctl->kctl->private_value ?
 279                         "Plugged" : "Unplugged");
 280         ret = simple_read_from_buffer(to, count, ppos, buf, len);
 281
 282         return ret;
 283 }
 284
 285 #ifdef CONFIG_SND_JACK_INPUT_DEV
 286 static ssize_t jack_type_read(struct file *file,
 287                               char __user *to, size_t count, loff_t *ppos)
 288 {
 289         struct snd_jack_kctl *jack_kctl = file->private_data;
 290         char buf[256];
 291         int len, ret;
 292
 293         len = parse_mask_bits(jack_kctl->jack->type, buf, sizeof(buf));
 294         ret = simple_read_from_buffer(to, count, ppos, buf, len);
 295
 296         return ret;
 297 }
 298
 299 static const struct file_operations jack_type_fops = {
 300         .open = simple_open,
 301         .read = jack_type_read,
 302         .llseek = default_llseek,
 303 };
 304 #endif
 305
 306 static const struct file_operations sw_inject_enable_fops = {
 307         .open = simple_open,
 308         .read = sw_inject_enable_read,
 309         .write = sw_inject_enable_write,
 310         .llseek = default_llseek,
 311 };
 312
 313 static const struct file_operations jackin_inject_fops = {
 314         .open = simple_open,
 315         .write = jackin_inject_write,
 316         .llseek = default_llseek,
 317 };
 318
 319 static const struct file_operations jack_kctl_id_fops = {
 320         .open = simple_open,
 321         .read = jack_kctl_id_read,
 322         .llseek = default_llseek,
 323 };
 324
 325 static const struct file_operations jack_kctl_mask_bits_fops = {
 326         .open = simple_open,
 327         .read = jack_kctl_mask_bits_read,
 328         .llseek = default_llseek,
 329 };
 330
 331 static const struct file_operations jack_kctl_status_fops = {
 332         .open = simple_open,
 333         .read = jack_kctl_status_read,
 334         .llseek = default_llseek,
 335 };
 336
 337 static int snd_jack_debugfs_add_inject_node(struct snd_jack *jack,
 338                                             struct snd_jack_kctl *jack_kctl)
 339 {
 340         char *tname;
 341         int i;
 342
 343         /* Don't create injection interface for Phantom jacks */
 344         if (strstr(jack_kctl->kctl->id.name, "Phantom"))
 345                 return 0;
 346
 347         tname = kstrdup(jack_kctl->kctl->id.name, GFP_KERNEL);
 348         if (!tname)
 349                 return -ENOMEM;
 350
 351         /* replace the chars which are not suitable for folder's name with _ */
 352         for (i = 0; tname[i]; i++)
 353                 if (!isalnum(tname[i]))
 354                         tname[i] = '_';
 355
 356         jack_kctl->jack_debugfs_root = debugfs_create_dir(tname, jack->card->debugfs_root);
 357         kfree(tname);
 358
 359         debugfs_create_file("sw_inject_enable", 0644, jack_kctl->jack_debugfs_root, jack_kctl,
 360                             &sw_inject_enable_fops);
 361
 362         debugfs_create_file("jackin_inject", 0200, jack_kctl->jack_debugfs_root, jack_kctl,
 363                             &jackin_inject_fops);
 364
 365         debugfs_create_file("kctl_id", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
 366                             &jack_kctl_id_fops);
 367
 368         debugfs_create_file("mask_bits", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
 369                             &jack_kctl_mask_bits_fops);
 370
 371         debugfs_create_file("status", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
 372                             &jack_kctl_status_fops);
 373
 374 #ifdef CONFIG_SND_JACK_INPUT_DEV
 375         debugfs_create_file("type", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
 376                             &jack_type_fops);
 377 #endif
 378         return 0;
 379 }
 380
 381 static void snd_jack_debugfs_clear_inject_node(struct snd_jack_kctl *jack_kctl)
 382 {
 383         debugfs_remove(jack_kctl->jack_debugfs_root);
 384         jack_kctl->jack_debugfs_root = NULL;
 385 }
 386 #else /* CONFIG_SND_JACK_INJECTION_DEBUG */
 387 static int snd_jack_debugfs_add_inject_node(struct snd_jack *jack,
 388                                             struct snd_jack_kctl *jack_kctl)
 389 {
 390         return 0;
 391 }
 392
 393 static void snd_jack_debugfs_clear_inject_node(struct snd_jack_kctl *jack_kctl)
 394 {
 395 }
 396 #endif /* CONFIG_SND_JACK_INJECTION_DEBUG */
 397
 398 static void snd_jack_kctl_private_free(struct snd_kcontrol *kctl)
 399 {
 400         struct snd_jack_kctl *jack_kctl;
 401
 402         jack_kctl = kctl->private_data;
 403         if (jack_kctl) {
 404                 snd_jack_debugfs_clear_inject_node(jack_kctl);
 405                 list_del(&jack_kctl->list);
 406                 kfree(jack_kctl);
 407         }
 408 }
 409
 410 static void snd_jack_kctl_add(struct snd_jack *jack, struct snd_jack_kctl *jack_kctl)
 411 {
 412         jack_kctl->jack = jack;
 413         list_add_tail(&jack_kctl->list, &jack->kctl_list);
 414         snd_jack_debugfs_add_inject_node(jack, jack_kctl);
 415 }
 416
 417 static struct snd_jack_kctl * snd_jack_kctl_new(struct snd_card *card, const char *name, unsigned int mask)
 418 {
 419         struct snd_kcontrol *kctl;
 420         struct snd_jack_kctl *jack_kctl;
 421         int err;
 422
 423         kctl = snd_kctl_jack_new(name, card);
 424         if (!kctl)
 425                 return NULL;
 426
 427         err = snd_ctl_add(card, kctl);
 428         if (err < 0)
 429                 return NULL;
 430
 431         jack_kctl = kzalloc(sizeof(*jack_kctl), GFP_KERNEL);
 432
 433         if (!jack_kctl)
 434                 goto error;
 435
 436         jack_kctl->kctl = kctl;
 437         jack_kctl->mask_bits = mask;
 438
 439         kctl->private_data = jack_kctl;
 440         kctl->private_free = snd_jack_kctl_private_free;
 441
 442         return jack_kctl;
 443 error:
 444         snd_ctl_free_one(kctl);
 445         return NULL;
 446 }
 447
 448 /**
 449  * snd_jack_add_new_kctl - Create a new snd_jack_kctl and add it to jack
 450  * @jack:  the jack instance which the kctl will attaching to
 451  * @name:  the name for the snd_kcontrol object
 452  * @mask:  a bitmask of enum snd_jack_type values that can be detected
 453  *         by this snd_jack_kctl object.
 454  *
 455  * Creates a new snd_kcontrol object and adds it to the jack kctl_list.
 456  *
 457  * Return: Zero if successful, or a negative error code on failure.
 458  */
 459 int snd_jack_add_new_kctl(struct snd_jack *jack, const char * name, int mask)
 460 {
 461         struct snd_jack_kctl *jack_kctl;
 462
 463         jack_kctl = snd_jack_kctl_new(jack->card, name, mask);
 464         if (!jack_kctl)
 465                 return -ENOMEM;
 466
 467         snd_jack_kctl_add(jack, jack_kctl);
 468         return 0;
 469 }
 470 EXPORT_SYMBOL(snd_jack_add_new_kctl);
 471
 472 /**
 473  * snd_jack_new - Create a new jack
 474  * @card:  the card instance
 475  * @id:    an identifying string for this jack
 476  * @type:  a bitmask of enum snd_jack_type values that can be detected by
 477  *         this jack
 478  * @jjack: Used to provide the allocated jack object to the caller.
 479  * @initial_kctl: if true, create a kcontrol and add it to the jack list.
 480  * @phantom_jack: Don't create a input device for phantom jacks.
 481  *
 482  * Creates a new jack object.
 483  *
 484  * Return: Zero if successful, or a negative error code on failure.
 485  * On success @jjack will be initialised.
 486  */
 487 int snd_jack_new(struct snd_card *card, const char *id, int type,
 488                  struct snd_jack **jjack, bool initial_kctl, bool phantom_jack)
 489 {
 490         struct snd_jack *jack;
 491         struct snd_jack_kctl *jack_kctl = NULL;
 492         int err;
 493         static const struct snd_device_ops ops = {
 494                 .dev_free = snd_jack_dev_free,
 495 #ifdef CONFIG_SND_JACK_INPUT_DEV
 496                 .dev_register = snd_jack_dev_register,
 497                 .dev_disconnect = snd_jack_dev_disconnect,
 498 #endif /* CONFIG_SND_JACK_INPUT_DEV */
 499         };
 500
 501         if (initial_kctl) {
 502                 jack_kctl = snd_jack_kctl_new(card, id, type);
 503                 if (!jack_kctl)
 504                         return -ENOMEM;
 505         }
 506
 507         jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
 508         if (jack == NULL)
 509                 return -ENOMEM;
 510
 511         jack->id = kstrdup(id, GFP_KERNEL);
 512
 513         /* don't creat input device for phantom jack */
 514         if (!phantom_jack) {
 515 #ifdef CONFIG_SND_JACK_INPUT_DEV
 516                 int i;
 517
 518                 jack->input_dev = input_allocate_device();
 519                 if (jack->input_dev == NULL) {
 520                         err = -ENOMEM;
 521                         goto fail_input;
 522                 }
 523
 524                 jack->input_dev->phys = "ALSA";
 525
 526                 jack->type = type;
 527
 528                 for (i = 0; i < SND_JACK_SWITCH_TYPES; i++)
 529                         if (type & (1 << i))
 530                                 input_set_capability(jack->input_dev, EV_SW,
 531                                                      jack_switch_types[i]);
 532
 533 #endif /* CONFIG_SND_JACK_INPUT_DEV */
 534         }
 535
 536         err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
 537         if (err < 0)
 538                 goto fail_input;
 539
 540         jack->card = card;
 541         INIT_LIST_HEAD(&jack->kctl_list);
 542
 543         if (initial_kctl)
 544                 snd_jack_kctl_add(jack, jack_kctl);
 545
 546         *jjack = jack;
 547
 548         return 0;
 549
 550 fail_input:
 551 #ifdef CONFIG_SND_JACK_INPUT_DEV
 552         input_free_device(jack->input_dev);
 553 #endif
 554         kfree(jack->id);
 555         kfree(jack);
 556         return err;
 557 }
 558 EXPORT_SYMBOL(snd_jack_new);
 559
 560 #ifdef CONFIG_SND_JACK_INPUT_DEV
 561 /**
 562  * snd_jack_set_parent - Set the parent device for a jack
 563  *
 564  * @jack:   The jack to configure
 565  * @parent: The device to set as parent for the jack.
 566  *
 567  * Set the parent for the jack devices in the device tree.  This
 568  * function is only valid prior to registration of the jack.  If no
 569  * parent is configured then the parent device will be the sound card.
 570  */
 571 void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
 572 {
 573         WARN_ON(jack->registered);
 574         if (!jack->input_dev)
 575                 return;
 576
 577         jack->input_dev->dev.parent = parent;
 578 }
 579 EXPORT_SYMBOL(snd_jack_set_parent);
 580
 581 /**
 582  * snd_jack_set_key - Set a key mapping on a jack
 583  *
 584  * @jack:    The jack to configure
 585  * @type:    Jack report type for this key
 586  * @keytype: Input layer key type to be reported
 587  *
 588  * Map a SND_JACK_BTN_* button type to an input layer key, allowing
 589  * reporting of keys on accessories via the jack abstraction.  If no
 590  * mapping is provided but keys are enabled in the jack type then
 591  * BTN_n numeric buttons will be reported.
 592  *
 593  * If jacks are not reporting via the input API this call will have no
 594  * effect.
 595  *
 596  * Note that this is intended to be use by simple devices with small
 597  * numbers of keys that can be reported.  It is also possible to
 598  * access the input device directly - devices with complex input
 599  * capabilities on accessories should consider doing this rather than
 600  * using this abstraction.
 601  *
 602  * This function may only be called prior to registration of the jack.
 603  *
 604  * Return: Zero if successful, or a negative error code on failure.
 605  */
 606 int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
 607                      int keytype)
 608 {
 609         int key = fls(SND_JACK_BTN_0) - fls(type);
 610
 611         WARN_ON(jack->registered);
 612
 613         if (!keytype || key >= ARRAY_SIZE(jack->key))
 614                 return -EINVAL;
 615
 616         jack->type |= type;
 617         jack->key[key] = keytype;
 618         return 0;
 619 }
 620 EXPORT_SYMBOL(snd_jack_set_key);
 621 #endif /* CONFIG_SND_JACK_INPUT_DEV */
 622
 623 /**
 624  * snd_jack_report - Report the current status of a jack
 625  *
 626  * @jack:   The jack to report status for
 627  * @status: The current status of the jack
 628  */
 629 void snd_jack_report(struct snd_jack *jack, int status)
 630 {
 631         struct snd_jack_kctl *jack_kctl;
 632         unsigned int mask_bits = 0;
 633 #ifdef CONFIG_SND_JACK_INPUT_DEV
 634         int i;
 635 #endif
 636
 637         if (!jack)
 638                 return;
 639
 640         jack->hw_status_cache = status;
 641
 642         list_for_each_entry(jack_kctl, &jack->kctl_list, list)
 643                 if (jack_kctl->sw_inject_enable)
 644                         mask_bits |= jack_kctl->mask_bits;
 645                 else
 646                         snd_kctl_jack_report(jack->card, jack_kctl->kctl,
 647                                              status & jack_kctl->mask_bits);
 648
 649 #ifdef CONFIG_SND_JACK_INPUT_DEV
 650         if (!jack->input_dev)
 651                 return;
 652
 653         for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
 654                 int testbit = ((SND_JACK_BTN_0 >> i) & ~mask_bits);
 655
 656                 if (jack->type & testbit)
 657                         input_report_key(jack->input_dev, jack->key[i],
 658                                          status & testbit);
 659         }
 660
 661         for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
 662                 int testbit = ((1 << i) & ~mask_bits);
 663
 664                 if (jack->type & testbit)
 665                         input_report_switch(jack->input_dev,
 666                                             jack_switch_types[i],
 667                                             status & testbit);
 668         }
 669
 670         input_sync(jack->input_dev);
 671 #endif /* CONFIG_SND_JACK_INPUT_DEV */
 672 }
 673 EXPORT_SYMBOL(snd_jack_report);