sound/usb/caiaq/input.c

   1 /*
   2  *   Copyright (c) 2006,2007 Daniel Mack, Tim Ruetz
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License as published by
   6  *   the Free Software Foundation; either version 2 of the License, or
   7  *   (at your option) any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program; if not, write to the Free Software
  16  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17 */
  18
  19 #include <linux/init.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/input.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24
  25 #include "device.h"
  26 #include "input.h"
  27
  28 static unsigned short keycode_ak1[] =  { KEY_C, KEY_B, KEY_A };
  29 static unsigned short keycode_rk2[] =  { KEY_1, KEY_2, KEY_3, KEY_4,
  30                                          KEY_5, KEY_6, KEY_7 };
  31 static unsigned short keycode_rk3[] =  { KEY_1, KEY_2, KEY_3, KEY_4,
  32                                          KEY_5, KEY_6, KEY_7, KEY_5, KEY_6 };
  33
  34 static unsigned short keycode_kore[] = {
  35         KEY_FN_F1,      /* "menu"               */
  36         KEY_FN_F7,      /* "lcd backlight       */
  37         KEY_FN_F2,      /* "control"            */
  38         KEY_FN_F3,      /* "enter"              */
  39         KEY_FN_F4,      /* "view"               */
  40         KEY_FN_F5,      /* "esc"                */
  41         KEY_FN_F6,      /* "sound"              */
  42         KEY_FN_F8,      /* array spacer, never triggered. */
  43         KEY_RIGHT,
  44         KEY_DOWN,
  45         KEY_UP,
  46         KEY_LEFT,
  47         KEY_SOUND,      /* "listen"             */
  48         KEY_RECORD,
  49         KEY_PLAYPAUSE,
  50         KEY_STOP,
  51         BTN_4,          /* 8 softkeys */
  52         BTN_3,
  53         BTN_2,
  54         BTN_1,
  55         BTN_8,
  56         BTN_7,
  57         BTN_6,
  58         BTN_5,
  59         KEY_BRL_DOT4,   /* touch sensitive knobs */
  60         KEY_BRL_DOT3,
  61         KEY_BRL_DOT2,
  62         KEY_BRL_DOT1,
  63         KEY_BRL_DOT8,
  64         KEY_BRL_DOT7,
  65         KEY_BRL_DOT6,
  66         KEY_BRL_DOT5
  67 };
  68
  69 #define KONTROLX1_INPUTS 40
  70
  71 #define DEG90           (range / 2)
  72 #define DEG180          (range)
  73 #define DEG270          (DEG90 + DEG180)
  74 #define DEG360          (DEG180 * 2)
  75 #define HIGH_PEAK       (268)
  76 #define LOW_PEAK        (-7)
  77
  78 /* some of these devices have endless rotation potentiometers
  79  * built in which use two tapers, 90 degrees phase shifted.
  80  * this algorithm decodes them to one single value, ranging
  81  * from 0 to 999 */
  82 static unsigned int decode_erp(unsigned char a, unsigned char b)
  83 {
  84         int weight_a, weight_b;
  85         int pos_a, pos_b;
  86         int ret;
  87         int range = HIGH_PEAK - LOW_PEAK;
  88         int mid_value = (HIGH_PEAK + LOW_PEAK) / 2;
  89
  90         weight_b = abs(mid_value - a) - (range / 2 - 100) / 2;
  91
  92         if (weight_b < 0)
  93                 weight_b = 0;
  94
  95         if (weight_b > 100)
  96                 weight_b = 100;
  97
  98         weight_a = 100 - weight_b;
  99
 100         if (a < mid_value) {
 101                 /* 0..90 and 270..360 degrees */
 102                 pos_b = b - LOW_PEAK + DEG270;
 103                 if (pos_b >= DEG360)
 104                         pos_b -= DEG360;
 105         } else
 106                 /* 90..270 degrees */
 107                 pos_b = HIGH_PEAK - b + DEG90;
 108
 109
 110         if (b > mid_value)
 111                 /* 0..180 degrees */
 112                 pos_a = a - LOW_PEAK;
 113         else
 114                 /* 180..360 degrees */
 115                 pos_a = HIGH_PEAK - a + DEG180;
 116
 117         /* interpolate both slider values, depending on weight factors */
 118         /* 0..99 x DEG360 */
 119         ret = pos_a * weight_a + pos_b * weight_b;
 120
 121         /* normalize to 0..999 */
 122         ret *= 10;
 123         ret /= DEG360;
 124
 125         if (ret < 0)
 126                 ret += 1000;
 127
 128         if (ret >= 1000)
 129                 ret -= 1000;
 130
 131         return ret;
 132 }
 133
 134 #undef DEG90
 135 #undef DEG180
 136 #undef DEG270
 137 #undef DEG360
 138 #undef HIGH_PEAK
 139 #undef LOW_PEAK
 140
 141
 142 static void snd_caiaq_input_read_analog(struct snd_usb_caiaqdev *dev,
 143                                         const unsigned char *buf,
 144                                         unsigned int len)
 145 {
 146         struct input_dev *input_dev = dev->input_dev;
 147
 148         switch (dev->chip.usb_id) {
 149         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL2):
 150                 input_report_abs(input_dev, ABS_X, (buf[4] << 8) | buf[5]);
 151                 input_report_abs(input_dev, ABS_Y, (buf[0] << 8) | buf[1]);
 152                 input_report_abs(input_dev, ABS_Z, (buf[2] << 8) | buf[3]);
 153                 input_sync(input_dev);
 154                 break;
 155         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
 156                 input_report_abs(input_dev, ABS_X, (buf[0] << 8) | buf[1]);
 157                 input_report_abs(input_dev, ABS_Y, (buf[2] << 8) | buf[3]);
 158                 input_report_abs(input_dev, ABS_Z, (buf[4] << 8) | buf[5]);
 159                 input_sync(input_dev);
 160                 break;
 161         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER):
 162         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2):
 163                 input_report_abs(input_dev, ABS_X, (buf[0] << 8) | buf[1]);
 164                 input_report_abs(input_dev, ABS_Y, (buf[2] << 8) | buf[3]);
 165                 input_report_abs(input_dev, ABS_Z, (buf[4] << 8) | buf[5]);
 166                 input_sync(input_dev);
 167                 break;
 168         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 169                 input_report_abs(input_dev, ABS_HAT0X, (buf[8] << 8)  | buf[9]);
 170                 input_report_abs(input_dev, ABS_HAT0Y, (buf[4] << 8)  | buf[5]);
 171                 input_report_abs(input_dev, ABS_HAT1X, (buf[12] << 8) | buf[13]);
 172                 input_report_abs(input_dev, ABS_HAT1Y, (buf[2] << 8)  | buf[3]);
 173                 input_report_abs(input_dev, ABS_HAT2X, (buf[15] << 8) | buf[15]);
 174                 input_report_abs(input_dev, ABS_HAT2Y, (buf[0] << 8)  | buf[1]);
 175                 input_report_abs(input_dev, ABS_HAT3X, (buf[10] << 8) | buf[11]);
 176                 input_report_abs(input_dev, ABS_HAT3Y, (buf[6] << 8)  | buf[7]);
 177                 input_sync(input_dev);
 178                 break;
 179         }
 180 }
 181
 182 static void snd_caiaq_input_read_erp(struct snd_usb_caiaqdev *dev,
 183                                      const char *buf, unsigned int len)
 184 {
 185         struct input_dev *input_dev = dev->input_dev;
 186         int i;
 187
 188         switch (dev->chip.usb_id) {
 189         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
 190                 i = decode_erp(buf[0], buf[1]);
 191                 input_report_abs(input_dev, ABS_X, i);
 192                 input_sync(input_dev);
 193                 break;
 194         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER):
 195         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2):
 196                 i = decode_erp(buf[7], buf[5]);
 197                 input_report_abs(input_dev, ABS_HAT0X, i);
 198                 i = decode_erp(buf[12], buf[14]);
 199                 input_report_abs(input_dev, ABS_HAT0Y, i);
 200                 i = decode_erp(buf[15], buf[13]);
 201                 input_report_abs(input_dev, ABS_HAT1X, i);
 202                 i = decode_erp(buf[0], buf[2]);
 203                 input_report_abs(input_dev, ABS_HAT1Y, i);
 204                 i = decode_erp(buf[3], buf[1]);
 205                 input_report_abs(input_dev, ABS_HAT2X, i);
 206                 i = decode_erp(buf[8], buf[10]);
 207                 input_report_abs(input_dev, ABS_HAT2Y, i);
 208                 i = decode_erp(buf[11], buf[9]);
 209                 input_report_abs(input_dev, ABS_HAT3X, i);
 210                 i = decode_erp(buf[4], buf[6]);
 211                 input_report_abs(input_dev, ABS_HAT3Y, i);
 212                 input_sync(input_dev);
 213                 break;
 214         }
 215 }
 216
 217 static void snd_caiaq_input_read_io(struct snd_usb_caiaqdev *dev,
 218                                     unsigned char *buf, unsigned int len)
 219 {
 220         struct input_dev *input_dev = dev->input_dev;
 221         unsigned short *keycode = input_dev->keycode;
 222         int i;
 223
 224         if (!keycode)
 225                 return;
 226
 227         if (input_dev->id.product == USB_PID_RIGKONTROL2)
 228                 for (i = 0; i < len; i++)
 229                         buf[i] = ~buf[i];
 230
 231         for (i = 0; i < input_dev->keycodemax && i < len * 8; i++)
 232                 input_report_key(input_dev, keycode[i],
 233                                  buf[i / 8] & (1 << (i % 8)));
 234
 235         switch (dev->chip.usb_id) {
 236         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER):
 237         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2):
 238                 input_report_abs(dev->input_dev, ABS_MISC, 255 - buf[4]);
 239                 break;
 240         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 241                 /* rotary encoders */
 242                 input_report_abs(dev->input_dev, ABS_X, buf[5] & 0xf);
 243                 input_report_abs(dev->input_dev, ABS_Y, buf[5] >> 4);
 244                 input_report_abs(dev->input_dev, ABS_Z, buf[6] & 0xf);
 245                 input_report_abs(dev->input_dev, ABS_MISC, buf[6] >> 4);
 246                 break;
 247         }
 248
 249         input_sync(input_dev);
 250 }
 251
 252 static void snd_usb_caiaq_ep4_reply_dispatch(struct urb *urb)
 253 {
 254         struct snd_usb_caiaqdev *dev = urb->context;
 255         unsigned char *buf = urb->transfer_buffer;
 256         int ret;
 257
 258         if (urb->status || !dev || urb != dev->ep4_in_urb)
 259                 return;
 260
 261         if (urb->actual_length < 24)
 262                 goto requeue;
 263
 264         switch (dev->chip.usb_id) {
 265         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 266                 if (buf[0] & 0x3)
 267                         snd_caiaq_input_read_io(dev, buf + 1, 7);
 268
 269                 if (buf[0] & 0x4)
 270                         snd_caiaq_input_read_analog(dev, buf + 8, 16);
 271
 272                 break;
 273         }
 274
 275 requeue:
 276         dev->ep4_in_urb->actual_length = 0;
 277         ret = usb_submit_urb(dev->ep4_in_urb, GFP_ATOMIC);
 278         if (ret < 0)
 279                 log("unable to submit urb. OOM!?\n");
 280 }
 281
 282 static int snd_usb_caiaq_input_open(struct input_dev *idev)
 283 {
 284         struct snd_usb_caiaqdev *dev = input_get_drvdata(idev);
 285
 286         if (!dev)
 287                 return -EINVAL;
 288
 289         switch (dev->chip.usb_id) {
 290         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 291                 if (usb_submit_urb(dev->ep4_in_urb, GFP_KERNEL) != 0)
 292                         return -EIO;
 293                 break;
 294         }
 295
 296         return 0;
 297 }
 298
 299 static void snd_usb_caiaq_input_close(struct input_dev *idev)
 300 {
 301         struct snd_usb_caiaqdev *dev = input_get_drvdata(idev);
 302
 303         if (!dev)
 304                 return;
 305
 306         switch (dev->chip.usb_id) {
 307         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 308                 usb_kill_urb(dev->ep4_in_urb);
 309                 break;
 310         }
 311 }
 312
 313 void snd_usb_caiaq_input_dispatch(struct snd_usb_caiaqdev *dev,
 314                                   char *buf,
 315                                   unsigned int len)
 316 {
 317         if (!dev->input_dev || len < 1)
 318                 return;
 319
 320         switch (buf[0]) {
 321         case EP1_CMD_READ_ANALOG:
 322                 snd_caiaq_input_read_analog(dev, buf + 1, len - 1);
 323                 break;
 324         case EP1_CMD_READ_ERP:
 325                 snd_caiaq_input_read_erp(dev, buf + 1, len - 1);
 326                 break;
 327         case EP1_CMD_READ_IO:
 328                 snd_caiaq_input_read_io(dev, buf + 1, len - 1);
 329                 break;
 330         }
 331 }
 332
 333 int snd_usb_caiaq_input_init(struct snd_usb_caiaqdev *dev)
 334 {
 335         struct usb_device *usb_dev = dev->chip.dev;
 336         struct input_dev *input;
 337         int i, ret = 0;
 338
 339         input = input_allocate_device();
 340         if (!input)
 341                 return -ENOMEM;
 342
 343         usb_make_path(usb_dev, dev->phys, sizeof(dev->phys));
 344         strlcat(dev->phys, "/input0", sizeof(dev->phys));
 345
 346         input->name = dev->product_name;
 347         input->phys = dev->phys;
 348         usb_to_input_id(usb_dev, &input->id);
 349         input->dev.parent = &usb_dev->dev;
 350
 351         input_set_drvdata(input, dev);
 352
 353         switch (dev->chip.usb_id) {
 354         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL2):
 355                 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 356                 input->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
 357                         BIT_MASK(ABS_Z);
 358                 BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_rk2));
 359                 memcpy(dev->keycode, keycode_rk2, sizeof(keycode_rk2));
 360                 input->keycodemax = ARRAY_SIZE(keycode_rk2);
 361                 input_set_abs_params(input, ABS_X, 0, 4096, 0, 10);
 362                 input_set_abs_params(input, ABS_Y, 0, 4096, 0, 10);
 363                 input_set_abs_params(input, ABS_Z, 0, 4096, 0, 10);
 364                 snd_usb_caiaq_set_auto_msg(dev, 1, 10, 0);
 365                 break;
 366         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
 367                 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 368                 input->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
 369                         BIT_MASK(ABS_Z);
 370                 BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_rk3));
 371                 memcpy(dev->keycode, keycode_rk3, sizeof(keycode_rk3));
 372                 input->keycodemax = ARRAY_SIZE(keycode_rk3);
 373                 input_set_abs_params(input, ABS_X, 0, 1024, 0, 10);
 374                 input_set_abs_params(input, ABS_Y, 0, 1024, 0, 10);
 375                 input_set_abs_params(input, ABS_Z, 0, 1024, 0, 10);
 376                 snd_usb_caiaq_set_auto_msg(dev, 1, 10, 0);
 377                 break;
 378         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
 379                 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 380                 input->absbit[0] = BIT_MASK(ABS_X);
 381                 BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_ak1));
 382                 memcpy(dev->keycode, keycode_ak1, sizeof(keycode_ak1));
 383                 input->keycodemax = ARRAY_SIZE(keycode_ak1);
 384                 input_set_abs_params(input, ABS_X, 0, 999, 0, 10);
 385                 snd_usb_caiaq_set_auto_msg(dev, 1, 0, 5);
 386                 break;
 387         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER):
 388         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2):
 389                 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 390                 input->absbit[0] = BIT_MASK(ABS_HAT0X) | BIT_MASK(ABS_HAT0Y) |
 391                                    BIT_MASK(ABS_HAT1X) | BIT_MASK(ABS_HAT1Y) |
 392                                    BIT_MASK(ABS_HAT2X) | BIT_MASK(ABS_HAT2Y) |
 393                                    BIT_MASK(ABS_HAT3X) | BIT_MASK(ABS_HAT3Y) |
 394                                    BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
 395                                    BIT_MASK(ABS_Z);
 396                 input->absbit[BIT_WORD(ABS_MISC)] |= BIT_MASK(ABS_MISC);
 397                 BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_kore));
 398                 memcpy(dev->keycode, keycode_kore, sizeof(keycode_kore));
 399                 input->keycodemax = ARRAY_SIZE(keycode_kore);
 400                 input_set_abs_params(input, ABS_HAT0X, 0, 999, 0, 10);
 401                 input_set_abs_params(input, ABS_HAT0Y, 0, 999, 0, 10);
 402                 input_set_abs_params(input, ABS_HAT1X, 0, 999, 0, 10);
 403                 input_set_abs_params(input, ABS_HAT1Y, 0, 999, 0, 10);
 404                 input_set_abs_params(input, ABS_HAT2X, 0, 999, 0, 10);
 405                 input_set_abs_params(input, ABS_HAT2Y, 0, 999, 0, 10);
 406                 input_set_abs_params(input, ABS_HAT3X, 0, 999, 0, 10);
 407                 input_set_abs_params(input, ABS_HAT3Y, 0, 999, 0, 10);
 408                 input_set_abs_params(input, ABS_X, 0, 4096, 0, 10);
 409                 input_set_abs_params(input, ABS_Y, 0, 4096, 0, 10);
 410                 input_set_abs_params(input, ABS_Z, 0, 4096, 0, 10);
 411                 input_set_abs_params(input, ABS_MISC, 0, 255, 0, 1);
 412                 snd_usb_caiaq_set_auto_msg(dev, 1, 10, 5);
 413                 break;
 414         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 415                 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 416                 input->absbit[0] = BIT_MASK(ABS_HAT0X) | BIT_MASK(ABS_HAT0Y) |
 417                                    BIT_MASK(ABS_HAT1X) | BIT_MASK(ABS_HAT1Y) |
 418                                    BIT_MASK(ABS_HAT2X) | BIT_MASK(ABS_HAT2Y) |
 419                                    BIT_MASK(ABS_HAT3X) | BIT_MASK(ABS_HAT3Y) |
 420                                    BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
 421                                    BIT_MASK(ABS_Z);
 422                 input->absbit[BIT_WORD(ABS_MISC)] |= BIT_MASK(ABS_MISC);
 423                 BUILD_BUG_ON(sizeof(dev->keycode) < KONTROLX1_INPUTS);
 424                 for (i = 0; i < KONTROLX1_INPUTS; i++)
 425                         dev->keycode[i] = BTN_MISC + i;
 426                 input->keycodemax = KONTROLX1_INPUTS;
 427
 428                 /* analog potentiometers */
 429                 input_set_abs_params(input, ABS_HAT0X, 0, 4096, 0, 10);
 430                 input_set_abs_params(input, ABS_HAT0Y, 0, 4096, 0, 10);
 431                 input_set_abs_params(input, ABS_HAT1X, 0, 4096, 0, 10);
 432                 input_set_abs_params(input, ABS_HAT1Y, 0, 4096, 0, 10);
 433                 input_set_abs_params(input, ABS_HAT2X, 0, 4096, 0, 10);
 434                 input_set_abs_params(input, ABS_HAT2Y, 0, 4096, 0, 10);
 435                 input_set_abs_params(input, ABS_HAT3X, 0, 4096, 0, 10);
 436                 input_set_abs_params(input, ABS_HAT3Y, 0, 4096, 0, 10);
 437
 438                 /* rotary encoders */
 439                 input_set_abs_params(input, ABS_X, 0, 0xf, 0, 1);
 440                 input_set_abs_params(input, ABS_Y, 0, 0xf, 0, 1);
 441                 input_set_abs_params(input, ABS_Z, 0, 0xf, 0, 1);
 442                 input_set_abs_params(input, ABS_MISC, 0, 0xf, 0, 1);
 443
 444                 dev->ep4_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 445                 if (!dev->ep4_in_urb) {
 446                         ret = -ENOMEM;
 447                         goto exit_free_idev;
 448                 }
 449
 450                 usb_fill_bulk_urb(dev->ep4_in_urb, usb_dev,
 451                                   usb_rcvbulkpipe(usb_dev, 0x4),
 452                                   dev->ep4_in_buf, EP4_BUFSIZE,
 453                                   snd_usb_caiaq_ep4_reply_dispatch, dev);
 454
 455                 snd_usb_caiaq_set_auto_msg(dev, 1, 10, 5);
 456
 457                 break;
 458         default:
 459                 /* no input methods supported on this device */
 460                 goto exit_free_idev;
 461         }
 462
 463         input->open = snd_usb_caiaq_input_open;
 464         input->close = snd_usb_caiaq_input_close;
 465         input->keycode = dev->keycode;
 466         input->keycodesize = sizeof(unsigned short);
 467         for (i = 0; i < input->keycodemax; i++)
 468                 __set_bit(dev->keycode[i], input->keybit);
 469
 470         ret = input_register_device(input);
 471         if (ret < 0)
 472                 goto exit_free_idev;
 473
 474         dev->input_dev = input;
 475         return 0;
 476
 477 exit_free_idev:
 478         input_free_device(input);
 479         return ret;
 480 }
 481
 482 void snd_usb_caiaq_input_free(struct snd_usb_caiaqdev *dev)
 483 {
 484         if (!dev || !dev->input_dev)
 485                 return;
 486
 487         usb_kill_urb(dev->ep4_in_urb);
 488         usb_free_urb(dev->ep4_in_urb);
 489         dev->ep4_in_urb = NULL;
 490
 491         input_unregister_device(dev->input_dev);
 492         dev->input_dev = NULL;
 493 }
 494