SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/gfp.h>
  20 #include <linux/init.h>
  21 #include <linux/usb.h>
  22 #include <linux/usb/input.h>
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25
  26 #include "device.h"
  27 #include "input.h"
  28
  29 static unsigned short keycode_ak1[] =  { KEY_C, KEY_B, KEY_A };
  30 static unsigned short keycode_rk2[] =  { KEY_1, KEY_2, KEY_3, KEY_4,
  31                                          KEY_5, KEY_6, KEY_7 };
  32 static unsigned short keycode_rk3[] =  { KEY_1, KEY_2, KEY_3, KEY_4,
  33                                          KEY_5, KEY_6, KEY_7, KEY_5, KEY_6 };
  34
  35 static unsigned short keycode_kore[] = {
  36         KEY_FN_F1,      /* "menu"               */
  37         KEY_FN_F7,      /* "lcd backlight       */
  38         KEY_FN_F2,      /* "control"            */
  39         KEY_FN_F3,      /* "enter"              */
  40         KEY_FN_F4,      /* "view"               */
  41         KEY_FN_F5,      /* "esc"                */
  42         KEY_FN_F6,      /* "sound"              */
  43         KEY_FN_F8,      /* array spacer, never triggered. */
  44         KEY_RIGHT,
  45         KEY_DOWN,
  46         KEY_UP,
  47         KEY_LEFT,
  48         KEY_SOUND,      /* "listen"             */
  49         KEY_RECORD,
  50         KEY_PLAYPAUSE,
  51         KEY_STOP,
  52         BTN_4,          /* 8 softkeys */
  53         BTN_3,
  54         BTN_2,
  55         BTN_1,
  56         BTN_8,
  57         BTN_7,
  58         BTN_6,
  59         BTN_5,
  60         KEY_BRL_DOT4,   /* touch sensitive knobs */
  61         KEY_BRL_DOT3,
  62         KEY_BRL_DOT2,
  63         KEY_BRL_DOT1,
  64         KEY_BRL_DOT8,
  65         KEY_BRL_DOT7,
  66         KEY_BRL_DOT6,
  67         KEY_BRL_DOT5
  68 };
  69
  70 #define KONTROLX1_INPUTS 40
  71
  72 #define DEG90           (range / 2)
  73 #define DEG180          (range)
  74 #define DEG270          (DEG90 + DEG180)
  75 #define DEG360          (DEG180 * 2)
  76 #define HIGH_PEAK       (268)
  77 #define LOW_PEAK        (-7)
  78
  79 /* some of these devices have endless rotation potentiometers
  80  * built in which use two tapers, 90 degrees phase shifted.
  81  * this algorithm decodes them to one single value, ranging
  82  * from 0 to 999 */
  83 static unsigned int decode_erp(unsigned char a, unsigned char b)
  84 {
  85         int weight_a, weight_b;
  86         int pos_a, pos_b;
  87         int ret;
  88         int range = HIGH_PEAK - LOW_PEAK;
  89         int mid_value = (HIGH_PEAK + LOW_PEAK) / 2;
  90
  91         weight_b = abs(mid_value - a) - (range / 2 - 100) / 2;
  92
  93         if (weight_b < 0)
  94                 weight_b = 0;
  95
  96         if (weight_b > 100)
  97                 weight_b = 100;
  98
  99         weight_a = 100 - weight_b;
 100
 101         if (a < mid_value) {
 102                 /* 0..90 and 270..360 degrees */
 103                 pos_b = b - LOW_PEAK + DEG270;
 104                 if (pos_b >= DEG360)
 105                         pos_b -= DEG360;
 106         } else
 107                 /* 90..270 degrees */
 108                 pos_b = HIGH_PEAK - b + DEG90;
 109
 110
 111         if (b > mid_value)
 112                 /* 0..180 degrees */
 113                 pos_a = a - LOW_PEAK;
 114         else
 115                 /* 180..360 degrees */
 116                 pos_a = HIGH_PEAK - a + DEG180;
 117
 118         /* interpolate both slider values, depending on weight factors */
 119         /* 0..99 x DEG360 */
 120         ret = pos_a * weight_a + pos_b * weight_b;
 121
 122         /* normalize to 0..999 */
 123         ret *= 10;
 124         ret /= DEG360;
 125
 126         if (ret < 0)
 127                 ret += 1000;
 128
 129         if (ret >= 1000)
 130                 ret -= 1000;
 131
 132         return ret;
 133 }
 134
 135 #undef DEG90
 136 #undef DEG180
 137 #undef DEG270
 138 #undef DEG360
 139 #undef HIGH_PEAK
 140 #undef LOW_PEAK
 141
 142
 143 static void snd_caiaq_input_read_analog(struct snd_usb_caiaqdev *dev,
 144                                         const unsigned char *buf,
 145                                         unsigned int len)
 146 {
 147         struct input_dev *input_dev = dev->input_dev;
 148
 149         switch (dev->chip.usb_id) {
 150         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL2):
 151                 input_report_abs(input_dev, ABS_X, (buf[4] << 8) | buf[5]);
 152                 input_report_abs(input_dev, ABS_Y, (buf[0] << 8) | buf[1]);
 153                 input_report_abs(input_dev, ABS_Z, (buf[2] << 8) | buf[3]);
 154                 input_sync(input_dev);
 155                 break;
 156         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
 157                 input_report_abs(input_dev, ABS_X, (buf[0] << 8) | buf[1]);
 158                 input_report_abs(input_dev, ABS_Y, (buf[2] << 8) | buf[3]);
 159                 input_report_abs(input_dev, ABS_Z, (buf[4] << 8) | buf[5]);
 160                 input_sync(input_dev);
 161                 break;
 162         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER):
 163         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2):
 164                 input_report_abs(input_dev, ABS_X, (buf[0] << 8) | buf[1]);
 165                 input_report_abs(input_dev, ABS_Y, (buf[2] << 8) | buf[3]);
 166                 input_report_abs(input_dev, ABS_Z, (buf[4] << 8) | buf[5]);
 167                 input_sync(input_dev);
 168                 break;
 169         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 170                 input_report_abs(input_dev, ABS_HAT0X, (buf[8] << 8)  | buf[9]);
 171                 input_report_abs(input_dev, ABS_HAT0Y, (buf[4] << 8)  | buf[5]);
 172                 input_report_abs(input_dev, ABS_HAT1X, (buf[12] << 8) | buf[13]);
 173                 input_report_abs(input_dev, ABS_HAT1Y, (buf[2] << 8)  | buf[3]);
 174                 input_report_abs(input_dev, ABS_HAT2X, (buf[14] << 8) | buf[15]);
 175                 input_report_abs(input_dev, ABS_HAT2Y, (buf[0] << 8)  | buf[1]);
 176                 input_report_abs(input_dev, ABS_HAT3X, (buf[10] << 8) | buf[11]);
 177                 input_report_abs(input_dev, ABS_HAT3Y, (buf[6] << 8)  | buf[7]);
 178                 input_sync(input_dev);
 179                 break;
 180         }
 181 }
 182
 183 static void snd_caiaq_input_read_erp(struct snd_usb_caiaqdev *dev,
 184                                      const char *buf, unsigned int len)
 185 {
 186         struct input_dev *input_dev = dev->input_dev;
 187         int i;
 188
 189         switch (dev->chip.usb_id) {
 190         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
 191                 i = decode_erp(buf[0], buf[1]);
 192                 input_report_abs(input_dev, ABS_X, i);
 193                 input_sync(input_dev);
 194                 break;
 195         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER):
 196         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2):
 197                 i = decode_erp(buf[7], buf[5]);
 198                 input_report_abs(input_dev, ABS_HAT0X, i);
 199                 i = decode_erp(buf[12], buf[14]);
 200                 input_report_abs(input_dev, ABS_HAT0Y, i);
 201                 i = decode_erp(buf[15], buf[13]);
 202                 input_report_abs(input_dev, ABS_HAT1X, i);
 203                 i = decode_erp(buf[0], buf[2]);
 204                 input_report_abs(input_dev, ABS_HAT1Y, i);
 205                 i = decode_erp(buf[3], buf[1]);
 206                 input_report_abs(input_dev, ABS_HAT2X, i);
 207                 i = decode_erp(buf[8], buf[10]);
 208                 input_report_abs(input_dev, ABS_HAT2Y, i);
 209                 i = decode_erp(buf[11], buf[9]);
 210                 input_report_abs(input_dev, ABS_HAT3X, i);
 211                 i = decode_erp(buf[4], buf[6]);
 212                 input_report_abs(input_dev, ABS_HAT3Y, i);
 213                 input_sync(input_dev);
 214                 break;
 215         }
 216 }
 217
 218 static void snd_caiaq_input_read_io(struct snd_usb_caiaqdev *dev,
 219                                     unsigned char *buf, unsigned int len)
 220 {
 221         struct input_dev *input_dev = dev->input_dev;
 222         unsigned short *keycode = input_dev->keycode;
 223         int i;
 224
 225         if (!keycode)
 226                 return;
 227
 228         if (input_dev->id.product == USB_PID_RIGKONTROL2)
 229                 for (i = 0; i < len; i++)
 230                         buf[i] = ~buf[i];
 231
 232         for (i = 0; i < input_dev->keycodemax && i < len * 8; i++)
 233                 input_report_key(input_dev, keycode[i],
 234                                  buf[i / 8] & (1 << (i % 8)));
 235
 236         switch (dev->chip.usb_id) {
 237         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER):
 238         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2):
 239                 input_report_abs(dev->input_dev, ABS_MISC, 255 - buf[4]);
 240                 break;
 241         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 242                 /* rotary encoders */
 243                 input_report_abs(dev->input_dev, ABS_X, buf[5] & 0xf);
 244                 input_report_abs(dev->input_dev, ABS_Y, buf[5] >> 4);
 245                 input_report_abs(dev->input_dev, ABS_Z, buf[6] & 0xf);
 246                 input_report_abs(dev->input_dev, ABS_MISC, buf[6] >> 4);
 247                 break;
 248         }
 249
 250         input_sync(input_dev);
 251 }
 252
 253 static void snd_usb_caiaq_ep4_reply_dispatch(struct urb *urb)
 254 {
 255         struct snd_usb_caiaqdev *dev = urb->context;
 256         unsigned char *buf = urb->transfer_buffer;
 257         int ret;
 258
 259         if (urb->status || !dev || urb != dev->ep4_in_urb)
 260                 return;
 261
 262         if (urb->actual_length < 24)
 263                 goto requeue;
 264
 265         switch (dev->chip.usb_id) {
 266         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 267                 if (buf[0] & 0x3)
 268                         snd_caiaq_input_read_io(dev, buf + 1, 7);
 269
 270                 if (buf[0] & 0x4)
 271                         snd_caiaq_input_read_analog(dev, buf + 8, 16);
 272
 273                 break;
 274         }
 275
 276 requeue:
 277         dev->ep4_in_urb->actual_length = 0;
 278         ret = usb_submit_urb(dev->ep4_in_urb, GFP_ATOMIC);
 279         if (ret < 0)
 280                 log("unable to submit urb. OOM!?\n");
 281 }
 282
 283 static int snd_usb_caiaq_input_open(struct input_dev *idev)
 284 {
 285         struct snd_usb_caiaqdev *dev = input_get_drvdata(idev);
 286
 287         if (!dev)
 288                 return -EINVAL;
 289
 290         switch (dev->chip.usb_id) {
 291         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 292                 if (usb_submit_urb(dev->ep4_in_urb, GFP_KERNEL) != 0)
 293                         return -EIO;
 294                 break;
 295         }
 296
 297         return 0;
 298 }
 299
 300 static void snd_usb_caiaq_input_close(struct input_dev *idev)
 301 {
 302         struct snd_usb_caiaqdev *dev = input_get_drvdata(idev);
 303
 304         if (!dev)
 305                 return;
 306
 307         switch (dev->chip.usb_id) {
 308         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 309                 usb_kill_urb(dev->ep4_in_urb);
 310                 break;
 311         }
 312 }
 313
 314 void snd_usb_caiaq_input_dispatch(struct snd_usb_caiaqdev *dev,
 315                                   char *buf,
 316                                   unsigned int len)
 317 {
 318         if (!dev->input_dev || len < 1)
 319                 return;
 320
 321         switch (buf[0]) {
 322         case EP1_CMD_READ_ANALOG:
 323                 snd_caiaq_input_read_analog(dev, buf + 1, len - 1);
 324                 break;
 325         case EP1_CMD_READ_ERP:
 326                 snd_caiaq_input_read_erp(dev, buf + 1, len - 1);
 327                 break;
 328         case EP1_CMD_READ_IO:
 329                 snd_caiaq_input_read_io(dev, buf + 1, len - 1);
 330                 break;
 331         }
 332 }
 333
 334 int snd_usb_caiaq_input_init(struct snd_usb_caiaqdev *dev)
 335 {
 336         struct usb_device *usb_dev = dev->chip.dev;
 337         struct input_dev *input;
 338         int i, ret = 0;
 339
 340         input = input_allocate_device();
 341         if (!input)
 342                 return -ENOMEM;
 343
 344         usb_make_path(usb_dev, dev->phys, sizeof(dev->phys));
 345         strlcat(dev->phys, "/input0", sizeof(dev->phys));
 346
 347         input->name = dev->product_name;
 348         input->phys = dev->phys;
 349         usb_to_input_id(usb_dev, &input->id);
 350         input->dev.parent = &usb_dev->dev;
 351
 352         input_set_drvdata(input, dev);
 353
 354         switch (dev->chip.usb_id) {
 355         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL2):
 356                 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 357                 input->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
 358                         BIT_MASK(ABS_Z);
 359                 BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_rk2));
 360                 memcpy(dev->keycode, keycode_rk2, sizeof(keycode_rk2));
 361                 input->keycodemax = ARRAY_SIZE(keycode_rk2);
 362                 input_set_abs_params(input, ABS_X, 0, 4096, 0, 10);
 363                 input_set_abs_params(input, ABS_Y, 0, 4096, 0, 10);
 364                 input_set_abs_params(input, ABS_Z, 0, 4096, 0, 10);
 365                 snd_usb_caiaq_set_auto_msg(dev, 1, 10, 0);
 366                 break;
 367         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
 368                 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 369                 input->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
 370                         BIT_MASK(ABS_Z);
 371                 BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_rk3));
 372                 memcpy(dev->keycode, keycode_rk3, sizeof(keycode_rk3));
 373                 input->keycodemax = ARRAY_SIZE(keycode_rk3);
 374                 input_set_abs_params(input, ABS_X, 0, 1024, 0, 10);
 375                 input_set_abs_params(input, ABS_Y, 0, 1024, 0, 10);
 376                 input_set_abs_params(input, ABS_Z, 0, 1024, 0, 10);
 377                 snd_usb_caiaq_set_auto_msg(dev, 1, 10, 0);
 378                 break;
 379         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
 380                 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 381                 input->absbit[0] = BIT_MASK(ABS_X);
 382                 BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_ak1));
 383                 memcpy(dev->keycode, keycode_ak1, sizeof(keycode_ak1));
 384                 input->keycodemax = ARRAY_SIZE(keycode_ak1);
 385                 input_set_abs_params(input, ABS_X, 0, 999, 0, 10);
 386                 snd_usb_caiaq_set_auto_msg(dev, 1, 0, 5);
 387                 break;
 388         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER):
 389         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2):
 390                 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 391                 input->absbit[0] = BIT_MASK(ABS_HAT0X) | BIT_MASK(ABS_HAT0Y) |
 392                                    BIT_MASK(ABS_HAT1X) | BIT_MASK(ABS_HAT1Y) |
 393                                    BIT_MASK(ABS_HAT2X) | BIT_MASK(ABS_HAT2Y) |
 394                                    BIT_MASK(ABS_HAT3X) | BIT_MASK(ABS_HAT3Y) |
 395                                    BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
 396                                    BIT_MASK(ABS_Z);
 397                 input->absbit[BIT_WORD(ABS_MISC)] |= BIT_MASK(ABS_MISC);
 398                 BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_kore));
 399                 memcpy(dev->keycode, keycode_kore, sizeof(keycode_kore));
 400                 input->keycodemax = ARRAY_SIZE(keycode_kore);
 401                 input_set_abs_params(input, ABS_HAT0X, 0, 999, 0, 10);
 402                 input_set_abs_params(input, ABS_HAT0Y, 0, 999, 0, 10);
 403                 input_set_abs_params(input, ABS_HAT1X, 0, 999, 0, 10);
 404                 input_set_abs_params(input, ABS_HAT1Y, 0, 999, 0, 10);
 405                 input_set_abs_params(input, ABS_HAT2X, 0, 999, 0, 10);
 406                 input_set_abs_params(input, ABS_HAT2Y, 0, 999, 0, 10);
 407                 input_set_abs_params(input, ABS_HAT3X, 0, 999, 0, 10);
 408                 input_set_abs_params(input, ABS_HAT3Y, 0, 999, 0, 10);
 409                 input_set_abs_params(input, ABS_X, 0, 4096, 0, 10);
 410                 input_set_abs_params(input, ABS_Y, 0, 4096, 0, 10);
 411                 input_set_abs_params(input, ABS_Z, 0, 4096, 0, 10);
 412                 input_set_abs_params(input, ABS_MISC, 0, 255, 0, 1);
 413                 snd_usb_caiaq_set_auto_msg(dev, 1, 10, 5);
 414                 break;
 415         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORKONTROLX1):
 416                 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 417                 input->absbit[0] = BIT_MASK(ABS_HAT0X) | BIT_MASK(ABS_HAT0Y) |
 418                                    BIT_MASK(ABS_HAT1X) | BIT_MASK(ABS_HAT1Y) |
 419                                    BIT_MASK(ABS_HAT2X) | BIT_MASK(ABS_HAT2Y) |
 420                                    BIT_MASK(ABS_HAT3X) | BIT_MASK(ABS_HAT3Y) |
 421                                    BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
 422                                    BIT_MASK(ABS_Z);
 423                 input->absbit[BIT_WORD(ABS_MISC)] |= BIT_MASK(ABS_MISC);
 424                 BUILD_BUG_ON(sizeof(dev->keycode) < KONTROLX1_INPUTS);
 425                 for (i = 0; i < KONTROLX1_INPUTS; i++)
 426                         dev->keycode[i] = BTN_MISC + i;
 427                 input->keycodemax = KONTROLX1_INPUTS;
 428
 429                 /* analog potentiometers */
 430                 input_set_abs_params(input, ABS_HAT0X, 0, 4096, 0, 10);
 431                 input_set_abs_params(input, ABS_HAT0Y, 0, 4096, 0, 10);
 432                 input_set_abs_params(input, ABS_HAT1X, 0, 4096, 0, 10);
 433                 input_set_abs_params(input, ABS_HAT1Y, 0, 4096, 0, 10);
 434                 input_set_abs_params(input, ABS_HAT2X, 0, 4096, 0, 10);
 435                 input_set_abs_params(input, ABS_HAT2Y, 0, 4096, 0, 10);
 436                 input_set_abs_params(input, ABS_HAT3X, 0, 4096, 0, 10);
 437                 input_set_abs_params(input, ABS_HAT3Y, 0, 4096, 0, 10);
 438
 439                 /* rotary encoders */
 440                 input_set_abs_params(input, ABS_X, 0, 0xf, 0, 1);
 441                 input_set_abs_params(input, ABS_Y, 0, 0xf, 0, 1);
 442                 input_set_abs_params(input, ABS_Z, 0, 0xf, 0, 1);
 443                 input_set_abs_params(input, ABS_MISC, 0, 0xf, 0, 1);
 444
 445                 dev->ep4_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 446                 if (!dev->ep4_in_urb) {
 447                         ret = -ENOMEM;
 448                         goto exit_free_idev;
 449                 }
 450
 451                 usb_fill_bulk_urb(dev->ep4_in_urb, usb_dev,
 452                                   usb_rcvbulkpipe(usb_dev, 0x4),
 453                                   dev->ep4_in_buf, EP4_BUFSIZE,
 454                                   snd_usb_caiaq_ep4_reply_dispatch, dev);
 455
 456                 snd_usb_caiaq_set_auto_msg(dev, 1, 10, 5);
 457
 458                 break;
 459         default:
 460                 /* no input methods supported on this device */
 461                 goto exit_free_idev;
 462         }
 463
 464         input->open = snd_usb_caiaq_input_open;
 465         input->close = snd_usb_caiaq_input_close;
 466         input->keycode = dev->keycode;
 467         input->keycodesize = sizeof(unsigned short);
 468         for (i = 0; i < input->keycodemax; i++)
 469                 __set_bit(dev->keycode[i], input->keybit);
 470
 471         ret = input_register_device(input);
 472         if (ret < 0)
 473                 goto exit_free_idev;
 474
 475         dev->input_dev = input;
 476         return 0;
 477
 478 exit_free_idev:
 479         input_free_device(input);
 480         return ret;
 481 }
 482
 483 void snd_usb_caiaq_input_free(struct snd_usb_caiaqdev *dev)
 484 {
 485         if (!dev || !dev->input_dev)
 486                 return;
 487
 488         usb_kill_urb(dev->ep4_in_urb);
 489         usb_free_urb(dev->ep4_in_urb);
 490         dev->ep4_in_urb = NULL;
 491
 492         input_unregister_device(dev->input_dev);
 493         dev->input_dev = NULL;
 494 }
 495