linux/sound/usb/6fire/control.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Linux driver for TerraTec DMX 6Fire USB
   4 *
   5 * Mixer control
   6 *
   7 * Author:      Torsten Schenk <torsten.schenk@zoho.com>
   8 * Created:     Jan 01, 2011
   9 * Copyright:   (C) Torsten Schenk
  10 *
  11 * Thanks to:
  12 * - Holger Ruckdeschel: he found out how to control individual channel
  13 *   volumes and introduced mute switch
  14 */
  15
  16#include <linux/interrupt.h>
  17#include <sound/control.h>
  18#include <sound/tlv.h>
  19
  20#include "control.h"
  21#include "comm.h"
  22#include "chip.h"
  23
  24static const char * const opt_coax_texts[2] = { "Optical", "Coax" };
  25static const char * const line_phono_texts[2] = { "Line", "Phono" };
  26
  27/*
  28 * data that needs to be sent to device. sets up card internal stuff.
  29 * values dumped from windows driver and filtered by trial'n'error.
  30 */
  31static const struct {
  32        u8 type;
  33        u8 reg;
  34        u8 value;
  35}
  36init_data[] = {
  37        { 0x22, 0x00, 0x00 }, { 0x20, 0x00, 0x08 }, { 0x22, 0x01, 0x01 },
  38        { 0x20, 0x01, 0x08 }, { 0x22, 0x02, 0x00 }, { 0x20, 0x02, 0x08 },
  39        { 0x22, 0x03, 0x00 }, { 0x20, 0x03, 0x08 }, { 0x22, 0x04, 0x00 },
  40        { 0x20, 0x04, 0x08 }, { 0x22, 0x05, 0x01 }, { 0x20, 0x05, 0x08 },
  41        { 0x22, 0x04, 0x01 }, { 0x12, 0x04, 0x00 }, { 0x12, 0x05, 0x00 },
  42        { 0x12, 0x0d, 0x38 }, { 0x12, 0x21, 0x82 }, { 0x12, 0x22, 0x80 },
  43        { 0x12, 0x23, 0x00 }, { 0x12, 0x06, 0x02 }, { 0x12, 0x03, 0x00 },
  44        { 0x12, 0x02, 0x00 }, { 0x22, 0x03, 0x01 },
  45        { 0 } /* TERMINATING ENTRY */
  46};
  47
  48static const int rates_altsetting[] = { 1, 1, 2, 2, 3, 3 };
  49/* values to write to soundcard register for all samplerates */
  50static const u16 rates_6fire_vl[] = {0x00, 0x01, 0x00, 0x01, 0x00, 0x01};
  51static const u16 rates_6fire_vh[] = {0x11, 0x11, 0x10, 0x10, 0x00, 0x00};
  52
  53static DECLARE_TLV_DB_MINMAX(tlv_output, -9000, 0);
  54static DECLARE_TLV_DB_MINMAX(tlv_input, -1500, 1500);
  55
  56enum {
  57        DIGITAL_THRU_ONLY_SAMPLERATE = 3
  58};
  59
  60static void usb6fire_control_output_vol_update(struct control_runtime *rt)
  61{
  62        struct comm_runtime *comm_rt = rt->chip->comm;
  63        int i;
  64
  65        if (comm_rt)
  66                for (i = 0; i < 6; i++)
  67                        if (!(rt->ovol_updated & (1 << i))) {
  68                                comm_rt->write8(comm_rt, 0x12, 0x0f + i,
  69                                        180 - rt->output_vol[i]);
  70                                rt->ovol_updated |= 1 << i;
  71                        }
  72}
  73
  74static void usb6fire_control_output_mute_update(struct control_runtime *rt)
  75{
  76        struct comm_runtime *comm_rt = rt->chip->comm;
  77
  78        if (comm_rt)
  79                comm_rt->write8(comm_rt, 0x12, 0x0e, ~rt->output_mute);
  80}
  81
  82static void usb6fire_control_input_vol_update(struct control_runtime *rt)
  83{
  84        struct comm_runtime *comm_rt = rt->chip->comm;
  85        int i;
  86
  87        if (comm_rt)
  88                for (i = 0; i < 2; i++)
  89                        if (!(rt->ivol_updated & (1 << i))) {
  90                                comm_rt->write8(comm_rt, 0x12, 0x1c + i,
  91                                        rt->input_vol[i] & 0x3f);
  92                                rt->ivol_updated |= 1 << i;
  93                        }
  94}
  95
  96static void usb6fire_control_line_phono_update(struct control_runtime *rt)
  97{
  98        struct comm_runtime *comm_rt = rt->chip->comm;
  99        if (comm_rt) {
 100                comm_rt->write8(comm_rt, 0x22, 0x02, rt->line_phono_switch);
 101                comm_rt->write8(comm_rt, 0x21, 0x02, rt->line_phono_switch);
 102        }
 103}
 104
 105static void usb6fire_control_opt_coax_update(struct control_runtime *rt)
 106{
 107        struct comm_runtime *comm_rt = rt->chip->comm;
 108        if (comm_rt) {
 109                comm_rt->write8(comm_rt, 0x22, 0x00, rt->opt_coax_switch);
 110                comm_rt->write8(comm_rt, 0x21, 0x00, rt->opt_coax_switch);
 111        }
 112}
 113
 114static int usb6fire_control_set_rate(struct control_runtime *rt, int rate)
 115{
 116        int ret;
 117        struct usb_device *device = rt->chip->dev;
 118        struct comm_runtime *comm_rt = rt->chip->comm;
 119
 120        if (rate < 0 || rate >= CONTROL_N_RATES)
 121                return -EINVAL;
 122
 123        ret = usb_set_interface(device, 1, rates_altsetting[rate]);
 124        if (ret < 0)
 125                return ret;
 126
 127        /* set soundcard clock */
 128        ret = comm_rt->write16(comm_rt, 0x02, 0x01, rates_6fire_vl[rate],
 129                        rates_6fire_vh[rate]);
 130        if (ret < 0)
 131                return ret;
 132
 133        return 0;
 134}
 135
 136static int usb6fire_control_set_channels(
 137        struct control_runtime *rt, int n_analog_out,
 138        int n_analog_in, bool spdif_out, bool spdif_in)
 139{
 140        int ret;
 141        struct comm_runtime *comm_rt = rt->chip->comm;
 142
 143        /* enable analog inputs and outputs
 144         * (one bit per stereo-channel) */
 145        ret = comm_rt->write16(comm_rt, 0x02, 0x02,
 146                        (1 << (n_analog_out / 2)) - 1,
 147                        (1 << (n_analog_in / 2)) - 1);
 148        if (ret < 0)
 149                return ret;
 150
 151        /* disable digital inputs and outputs */
 152        /* TODO: use spdif_x to enable/disable digital channels */
 153        ret = comm_rt->write16(comm_rt, 0x02, 0x03, 0x00, 0x00);
 154        if (ret < 0)
 155                return ret;
 156
 157        return 0;
 158}
 159
 160static int usb6fire_control_streaming_update(struct control_runtime *rt)
 161{
 162        struct comm_runtime *comm_rt = rt->chip->comm;
 163
 164        if (comm_rt) {
 165                if (!rt->usb_streaming && rt->digital_thru_switch)
 166                        usb6fire_control_set_rate(rt,
 167                                DIGITAL_THRU_ONLY_SAMPLERATE);
 168                return comm_rt->write16(comm_rt, 0x02, 0x00, 0x00,
 169                        (rt->usb_streaming ? 0x01 : 0x00) |
 170                        (rt->digital_thru_switch ? 0x08 : 0x00));
 171        }
 172        return -EINVAL;
 173}
 174
 175static int usb6fire_control_output_vol_info(struct snd_kcontrol *kcontrol,
 176                struct snd_ctl_elem_info *uinfo)
 177{
 178        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 179        uinfo->count = 2;
 180        uinfo->value.integer.min = 0;
 181        uinfo->value.integer.max = 180;
 182        return 0;
 183}
 184
 185static int usb6fire_control_output_vol_put(struct snd_kcontrol *kcontrol,
 186                struct snd_ctl_elem_value *ucontrol)
 187{
 188        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 189        unsigned int ch = kcontrol->private_value;
 190        int changed = 0;
 191
 192        if (ch > 4) {
 193                dev_err(&rt->chip->dev->dev,
 194                        "Invalid channel in volume control.");
 195                return -EINVAL;
 196        }
 197
 198        if (rt->output_vol[ch] != ucontrol->value.integer.value[0]) {
 199                rt->output_vol[ch] = ucontrol->value.integer.value[0];
 200                rt->ovol_updated &= ~(1 << ch);
 201                changed = 1;
 202        }
 203        if (rt->output_vol[ch + 1] != ucontrol->value.integer.value[1]) {
 204                rt->output_vol[ch + 1] = ucontrol->value.integer.value[1];
 205                rt->ovol_updated &= ~(2 << ch);
 206                changed = 1;
 207        }
 208
 209        if (changed)
 210                usb6fire_control_output_vol_update(rt);
 211
 212        return changed;
 213}
 214
 215static int usb6fire_control_output_vol_get(struct snd_kcontrol *kcontrol,
 216                struct snd_ctl_elem_value *ucontrol)
 217{
 218        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 219        unsigned int ch = kcontrol->private_value;
 220
 221        if (ch > 4) {
 222                dev_err(&rt->chip->dev->dev,
 223                        "Invalid channel in volume control.");
 224                return -EINVAL;
 225        }
 226
 227        ucontrol->value.integer.value[0] = rt->output_vol[ch];
 228        ucontrol->value.integer.value[1] = rt->output_vol[ch + 1];
 229        return 0;
 230}
 231
 232static int usb6fire_control_output_mute_put(struct snd_kcontrol *kcontrol,
 233        struct snd_ctl_elem_value *ucontrol)
 234{
 235        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 236        unsigned int ch = kcontrol->private_value;
 237        u8 old = rt->output_mute;
 238        u8 value = 0;
 239
 240        if (ch > 4) {
 241                dev_err(&rt->chip->dev->dev,
 242                        "Invalid channel in volume control.");
 243                return -EINVAL;
 244        }
 245
 246        rt->output_mute &= ~(3 << ch);
 247        if (ucontrol->value.integer.value[0])
 248                value |= 1;
 249        if (ucontrol->value.integer.value[1])
 250                value |= 2;
 251        rt->output_mute |= value << ch;
 252
 253        if (rt->output_mute != old)
 254                usb6fire_control_output_mute_update(rt);
 255
 256        return rt->output_mute != old;
 257}
 258
 259static int usb6fire_control_output_mute_get(struct snd_kcontrol *kcontrol,
 260        struct snd_ctl_elem_value *ucontrol)
 261{
 262        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 263        unsigned int ch = kcontrol->private_value;
 264        u8 value = rt->output_mute >> ch;
 265
 266        if (ch > 4) {
 267                dev_err(&rt->chip->dev->dev,
 268                        "Invalid channel in volume control.");
 269                return -EINVAL;
 270        }
 271
 272        ucontrol->value.integer.value[0] = 1 & value;
 273        value >>= 1;
 274        ucontrol->value.integer.value[1] = 1 & value;
 275
 276        return 0;
 277}
 278
 279static int usb6fire_control_input_vol_info(struct snd_kcontrol *kcontrol,
 280                struct snd_ctl_elem_info *uinfo)
 281{
 282        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 283        uinfo->count = 2;
 284        uinfo->value.integer.min = 0;
 285        uinfo->value.integer.max = 30;
 286        return 0;
 287}
 288
 289static int usb6fire_control_input_vol_put(struct snd_kcontrol *kcontrol,
 290                struct snd_ctl_elem_value *ucontrol)
 291{
 292        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 293        int changed = 0;
 294
 295        if (rt->input_vol[0] != ucontrol->value.integer.value[0]) {
 296                rt->input_vol[0] = ucontrol->value.integer.value[0] - 15;
 297                rt->ivol_updated &= ~(1 << 0);
 298                changed = 1;
 299        }
 300        if (rt->input_vol[1] != ucontrol->value.integer.value[1]) {
 301                rt->input_vol[1] = ucontrol->value.integer.value[1] - 15;
 302                rt->ivol_updated &= ~(1 << 1);
 303                changed = 1;
 304        }
 305
 306        if (changed)
 307                usb6fire_control_input_vol_update(rt);
 308
 309        return changed;
 310}
 311
 312static int usb6fire_control_input_vol_get(struct snd_kcontrol *kcontrol,
 313                struct snd_ctl_elem_value *ucontrol)
 314{
 315        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 316
 317        ucontrol->value.integer.value[0] = rt->input_vol[0] + 15;
 318        ucontrol->value.integer.value[1] = rt->input_vol[1] + 15;
 319
 320        return 0;
 321}
 322
 323static int usb6fire_control_line_phono_info(struct snd_kcontrol *kcontrol,
 324                struct snd_ctl_elem_info *uinfo)
 325{
 326        return snd_ctl_enum_info(uinfo, 1, 2, line_phono_texts);
 327}
 328
 329static int usb6fire_control_line_phono_put(struct snd_kcontrol *kcontrol,
 330                struct snd_ctl_elem_value *ucontrol)
 331{
 332        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 333        int changed = 0;
 334        if (rt->line_phono_switch != ucontrol->value.integer.value[0]) {
 335                rt->line_phono_switch = ucontrol->value.integer.value[0];
 336                usb6fire_control_line_phono_update(rt);
 337                changed = 1;
 338        }
 339        return changed;
 340}
 341
 342static int usb6fire_control_line_phono_get(struct snd_kcontrol *kcontrol,
 343                struct snd_ctl_elem_value *ucontrol)
 344{
 345        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 346        ucontrol->value.integer.value[0] = rt->line_phono_switch;
 347        return 0;
 348}
 349
 350static int usb6fire_control_opt_coax_info(struct snd_kcontrol *kcontrol,
 351                struct snd_ctl_elem_info *uinfo)
 352{
 353        return snd_ctl_enum_info(uinfo, 1, 2, opt_coax_texts);
 354}
 355
 356static int usb6fire_control_opt_coax_put(struct snd_kcontrol *kcontrol,
 357                struct snd_ctl_elem_value *ucontrol)
 358{
 359        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 360        int changed = 0;
 361
 362        if (rt->opt_coax_switch != ucontrol->value.enumerated.item[0]) {
 363                rt->opt_coax_switch = ucontrol->value.enumerated.item[0];
 364                usb6fire_control_opt_coax_update(rt);
 365                changed = 1;
 366        }
 367        return changed;
 368}
 369
 370static int usb6fire_control_opt_coax_get(struct snd_kcontrol *kcontrol,
 371                struct snd_ctl_elem_value *ucontrol)
 372{
 373        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 374        ucontrol->value.enumerated.item[0] = rt->opt_coax_switch;
 375        return 0;
 376}
 377
 378static int usb6fire_control_digital_thru_put(struct snd_kcontrol *kcontrol,
 379                struct snd_ctl_elem_value *ucontrol)
 380{
 381        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 382        int changed = 0;
 383
 384        if (rt->digital_thru_switch != ucontrol->value.integer.value[0]) {
 385                rt->digital_thru_switch = ucontrol->value.integer.value[0];
 386                usb6fire_control_streaming_update(rt);
 387                changed = 1;
 388        }
 389        return changed;
 390}
 391
 392static int usb6fire_control_digital_thru_get(struct snd_kcontrol *kcontrol,
 393                struct snd_ctl_elem_value *ucontrol)
 394{
 395        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 396        ucontrol->value.integer.value[0] = rt->digital_thru_switch;
 397        return 0;
 398}
 399
 400static const struct snd_kcontrol_new vol_elements[] = {
 401        {
 402                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 403                .name = "Analog Playback Volume",
 404                .index = 0,
 405                .private_value = 0,
 406                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 407                        SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 408                .info = usb6fire_control_output_vol_info,
 409                .get = usb6fire_control_output_vol_get,
 410                .put = usb6fire_control_output_vol_put,
 411                .tlv = { .p = tlv_output }
 412        },
 413        {
 414                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 415                .name = "Analog Playback Volume",
 416                .index = 1,
 417                .private_value = 2,
 418                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 419                        SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 420                .info = usb6fire_control_output_vol_info,
 421                .get = usb6fire_control_output_vol_get,
 422                .put = usb6fire_control_output_vol_put,
 423                .tlv = { .p = tlv_output }
 424        },
 425        {
 426                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 427                .name = "Analog Playback Volume",
 428                .index = 2,
 429                .private_value = 4,
 430                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 431                        SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 432                .info = usb6fire_control_output_vol_info,
 433                .get = usb6fire_control_output_vol_get,
 434                .put = usb6fire_control_output_vol_put,
 435                .tlv = { .p = tlv_output }
 436        },
 437        {}
 438};
 439
 440static const struct snd_kcontrol_new mute_elements[] = {
 441        {
 442                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 443                .name = "Analog Playback Switch",
 444                .index = 0,
 445                .private_value = 0,
 446                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 447                .info = snd_ctl_boolean_stereo_info,
 448                .get = usb6fire_control_output_mute_get,
 449                .put = usb6fire_control_output_mute_put,
 450        },
 451        {
 452                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 453                .name = "Analog Playback Switch",
 454                .index = 1,
 455                .private_value = 2,
 456                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 457                .info = snd_ctl_boolean_stereo_info,
 458                .get = usb6fire_control_output_mute_get,
 459                .put = usb6fire_control_output_mute_put,
 460        },
 461        {
 462                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 463                .name = "Analog Playback Switch",
 464                .index = 2,
 465                .private_value = 4,
 466                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 467                .info = snd_ctl_boolean_stereo_info,
 468                .get = usb6fire_control_output_mute_get,
 469                .put = usb6fire_control_output_mute_put,
 470        },
 471        {}
 472};
 473
 474static const struct snd_kcontrol_new elements[] = {
 475        {
 476                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 477                .name = "Line/Phono Capture Route",
 478                .index = 0,
 479                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 480                .info = usb6fire_control_line_phono_info,
 481                .get = usb6fire_control_line_phono_get,
 482                .put = usb6fire_control_line_phono_put
 483        },
 484        {
 485                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 486                .name = "Opt/Coax Capture Route",
 487                .index = 0,
 488                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 489                .info = usb6fire_control_opt_coax_info,
 490                .get = usb6fire_control_opt_coax_get,
 491                .put = usb6fire_control_opt_coax_put
 492        },
 493        {
 494                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 495                .name = "Digital Thru Playback Route",
 496                .index = 0,
 497                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 498                .info = snd_ctl_boolean_mono_info,
 499                .get = usb6fire_control_digital_thru_get,
 500                .put = usb6fire_control_digital_thru_put
 501        },
 502        {
 503                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 504                .name = "Analog Capture Volume",
 505                .index = 0,
 506                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 507                        SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 508                .info = usb6fire_control_input_vol_info,
 509                .get = usb6fire_control_input_vol_get,
 510                .put = usb6fire_control_input_vol_put,
 511                .tlv = { .p = tlv_input }
 512        },
 513        {}
 514};
 515
 516static int usb6fire_control_add_virtual(
 517        struct control_runtime *rt,
 518        struct snd_card *card,
 519        char *name,
 520        const struct snd_kcontrol_new *elems)
 521{
 522        int ret;
 523        int i;
 524        struct snd_kcontrol *vmaster =
 525                snd_ctl_make_virtual_master(name, tlv_output);
 526        struct snd_kcontrol *control;
 527
 528        if (!vmaster)
 529                return -ENOMEM;
 530        ret = snd_ctl_add(card, vmaster);
 531        if (ret < 0)
 532                return ret;
 533
 534        i = 0;
 535        while (elems[i].name) {
 536                control = snd_ctl_new1(&elems[i], rt);
 537                if (!control)
 538                        return -ENOMEM;
 539                ret = snd_ctl_add(card, control);
 540                if (ret < 0)
 541                        return ret;
 542                ret = snd_ctl_add_follower(vmaster, control);
 543                if (ret < 0)
 544                        return ret;
 545                i++;
 546        }
 547        return 0;
 548}
 549
 550int usb6fire_control_init(struct sfire_chip *chip)
 551{
 552        int i;
 553        int ret;
 554        struct control_runtime *rt = kzalloc(sizeof(struct control_runtime),
 555                        GFP_KERNEL);
 556        struct comm_runtime *comm_rt = chip->comm;
 557
 558        if (!rt)
 559                return -ENOMEM;
 560
 561        rt->chip = chip;
 562        rt->update_streaming = usb6fire_control_streaming_update;
 563        rt->set_rate = usb6fire_control_set_rate;
 564        rt->set_channels = usb6fire_control_set_channels;
 565
 566        i = 0;
 567        while (init_data[i].type) {
 568                comm_rt->write8(comm_rt, init_data[i].type, init_data[i].reg,
 569                                init_data[i].value);
 570                i++;
 571        }
 572
 573        usb6fire_control_opt_coax_update(rt);
 574        usb6fire_control_line_phono_update(rt);
 575        usb6fire_control_output_vol_update(rt);
 576        usb6fire_control_output_mute_update(rt);
 577        usb6fire_control_input_vol_update(rt);
 578        usb6fire_control_streaming_update(rt);
 579
 580        ret = usb6fire_control_add_virtual(rt, chip->card,
 581                "Master Playback Volume", vol_elements);
 582        if (ret) {
 583                dev_err(&chip->dev->dev, "cannot add control.\n");
 584                kfree(rt);
 585                return ret;
 586        }
 587        ret = usb6fire_control_add_virtual(rt, chip->card,
 588                "Master Playback Switch", mute_elements);
 589        if (ret) {
 590                dev_err(&chip->dev->dev, "cannot add control.\n");
 591                kfree(rt);
 592                return ret;
 593        }
 594
 595        i = 0;
 596        while (elements[i].name) {
 597                ret = snd_ctl_add(chip->card, snd_ctl_new1(&elements[i], rt));
 598                if (ret < 0) {
 599                        kfree(rt);
 600                        dev_err(&chip->dev->dev, "cannot add control.\n");
 601                        return ret;
 602                }
 603                i++;
 604        }
 605
 606        chip->control = rt;
 607        return 0;
 608}
 609
 610void usb6fire_control_abort(struct sfire_chip *chip)
 611{}
 612
 613void usb6fire_control_destroy(struct sfire_chip *chip)
 614{
 615        kfree(chip->control);
 616        chip->control = NULL;
 617}
 618