g_audio.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2010 Hans Petter Selasky. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 /*
   29  * USB audio specs: http://www.usb.org/developers/devclass_docs/audio10.pdf
   30  *                  http://www.usb.org/developers/devclass_docs/frmts10.pdf
   31  *                  http://www.usb.org/developers/devclass_docs/termt10.pdf
   32  */
   33 
   34 #include <sys/param.h>
   35 __FBSDID("$FreeBSD$");
   36 
   37 #include <sys/stdint.h>
   38 #include <sys/stddef.h>
   39 #include <sys/queue.h>
   40 #include <sys/systm.h>
   41 #include <sys/kernel.h>
   42 #include <sys/bus.h>
   43 #include <sys/linker_set.h>
   44 #include <sys/module.h>
   45 #include <sys/lock.h>
   46 #include <sys/mutex.h>
   47 #include <sys/condvar.h>
   48 #include <sys/sysctl.h>
   49 #include <sys/sx.h>
   50 #include <sys/unistd.h>
   51 #include <sys/callout.h>
   52 #include <sys/malloc.h>
   53 #include <sys/priv.h>
   54 
   55 #include <dev/usb/usb.h>
   56 #include <dev/usb/usb_cdc.h>
   57 #include <dev/usb/usbdi.h>
   58 #include <dev/usb/usbdi_util.h>
   59 #include <dev/usb/usbhid.h>
   60 #include "usb_if.h"
   61 
   62 #define USB_DEBUG_VAR g_audio_debug
   63 #include <dev/usb/usb_debug.h>
   64 
   65 #include <dev/usb/gadget/g_audio.h>
   66 
   67 enum {
   68         G_AUDIO_ISOC0_RD,
   69         G_AUDIO_ISOC1_RD,
   70         G_AUDIO_ISOC0_WR,
   71         G_AUDIO_ISOC1_WR,
   72         G_AUDIO_N_TRANSFER,
   73 };
   74 
   75 struct g_audio_softc {
   76         struct mtx sc_mtx;
   77         struct usb_callout sc_callout;
   78         struct usb_callout sc_watchdog;
   79         struct usb_xfer *sc_xfer[G_AUDIO_N_TRANSFER];
   80 
   81         int     sc_mode;
   82         int     sc_pattern_len;
   83         int     sc_throughput;
   84         int     sc_tx_interval;
   85         int     sc_state;
   86         int     sc_noise_rem;
   87 
   88         int8_t  sc_pattern[G_AUDIO_MAX_STRLEN];
   89 
   90         uint16_t sc_data_len[2][G_AUDIO_FRAMES];
   91 
   92         int16_t sc_data_buf[2][G_AUDIO_BUFSIZE / 2];
   93 
   94         uint8_t sc_volume_setting[32];
   95         uint8_t sc_volume_limit[32];
   96         uint8_t sc_sample_rate[32];
   97 };
   98 
   99 static SYSCTL_NODE(_hw_usb, OID_AUTO, g_audio, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
  100     "USB audio gadget");
  101 
  102 #ifdef USB_DEBUG
  103 static int g_audio_debug = 0;
  104 
  105 SYSCTL_INT(_hw_usb_g_audio, OID_AUTO, debug, CTLFLAG_RWTUN,
  106     &g_audio_debug, 0, "Debug level");
  107 #endif
  108 
  109 static int g_audio_mode = 0;
  110 
  111 SYSCTL_INT(_hw_usb_g_audio, OID_AUTO, mode, CTLFLAG_RWTUN,
  112     &g_audio_mode, 0, "Mode selection");
  113 
  114 static int g_audio_pattern_interval = 1000;
  115 
  116 SYSCTL_INT(_hw_usb_g_audio, OID_AUTO, pattern_interval, CTLFLAG_RWTUN,
  117     &g_audio_pattern_interval, 0, "Pattern interval in milliseconds");
  118 
  119 static char g_audio_pattern_data[G_AUDIO_MAX_STRLEN];
  120 
  121 SYSCTL_STRING(_hw_usb_g_audio, OID_AUTO, pattern, CTLFLAG_RW,
  122     &g_audio_pattern_data, sizeof(g_audio_pattern_data), "Data pattern");
  123 
  124 static int g_audio_throughput;
  125 
  126 SYSCTL_INT(_hw_usb_g_audio, OID_AUTO, throughput, CTLFLAG_RD,
  127     &g_audio_throughput, sizeof(g_audio_throughput), "Throughput in bytes per second");
  128 
  129 static device_probe_t g_audio_probe;
  130 static device_attach_t g_audio_attach;
  131 static device_detach_t g_audio_detach;
  132 static usb_handle_request_t g_audio_handle_request;
  133 
  134 static usb_callback_t g_audio_isoc_read_callback;
  135 static usb_callback_t g_audio_isoc_write_callback;
  136 
  137 static void g_audio_watchdog(void *arg);
  138 static void g_audio_timeout(void *arg);
  139 
  140 static device_method_t g_audio_methods[] = {
  141         /* USB interface */
  142         DEVMETHOD(usb_handle_request, g_audio_handle_request),
  143 
  144         /* Device interface */
  145         DEVMETHOD(device_probe, g_audio_probe),
  146         DEVMETHOD(device_attach, g_audio_attach),
  147         DEVMETHOD(device_detach, g_audio_detach),
  148 
  149         DEVMETHOD_END
  150 };
  151 
  152 static driver_t g_audio_driver = {
  153         .name = "g_audio",
  154         .methods = g_audio_methods,
  155         .size = sizeof(struct g_audio_softc),
  156 };
  157 
  158 DRIVER_MODULE(g_audio, uhub, g_audio_driver, 0, 0);
  159 MODULE_DEPEND(g_audio, usb, 1, 1, 1);
  160 
  161 static const struct usb_config g_audio_config[G_AUDIO_N_TRANSFER] = {
  162         [G_AUDIO_ISOC0_RD] = {
  163                 .type = UE_ISOCHRONOUS,
  164                 .endpoint = UE_ADDR_ANY,
  165                 .direction = UE_DIR_RX,
  166                 .flags = {.ext_buffer = 1,.pipe_bof = 1,.short_xfer_ok = 1,},
  167                 .bufsize = G_AUDIO_BUFSIZE,
  168                 .callback = &g_audio_isoc_read_callback,
  169                 .frames = G_AUDIO_FRAMES,
  170                 .usb_mode = USB_MODE_DEVICE,
  171                 .if_index = 1,
  172         },
  173 
  174         [G_AUDIO_ISOC1_RD] = {
  175                 .type = UE_ISOCHRONOUS,
  176                 .endpoint = UE_ADDR_ANY,
  177                 .direction = UE_DIR_RX,
  178                 .flags = {.ext_buffer = 1,.pipe_bof = 1,.short_xfer_ok = 1,},
  179                 .bufsize = G_AUDIO_BUFSIZE,
  180                 .callback = &g_audio_isoc_read_callback,
  181                 .frames = G_AUDIO_FRAMES,
  182                 .usb_mode = USB_MODE_DEVICE,
  183                 .if_index = 1,
  184         },
  185 
  186         [G_AUDIO_ISOC0_WR] = {
  187                 .type = UE_ISOCHRONOUS,
  188                 .endpoint = UE_ADDR_ANY,
  189                 .direction = UE_DIR_TX,
  190                 .flags = {.ext_buffer = 1,.pipe_bof = 1,},
  191                 .bufsize = G_AUDIO_BUFSIZE,
  192                 .callback = &g_audio_isoc_write_callback,
  193                 .frames = G_AUDIO_FRAMES,
  194                 .usb_mode = USB_MODE_DEVICE,
  195                 .if_index = 2,
  196         },
  197 
  198         [G_AUDIO_ISOC1_WR] = {
  199                 .type = UE_ISOCHRONOUS,
  200                 .endpoint = UE_ADDR_ANY,
  201                 .direction = UE_DIR_TX,
  202                 .flags = {.ext_buffer = 1,.pipe_bof = 1,},
  203                 .bufsize = G_AUDIO_BUFSIZE,
  204                 .callback = &g_audio_isoc_write_callback,
  205                 .frames = G_AUDIO_FRAMES,
  206                 .usb_mode = USB_MODE_DEVICE,
  207                 .if_index = 2,
  208         },
  209 };
  210 
  211 static void
  212 g_audio_timeout_reset(struct g_audio_softc *sc)
  213 {
  214         int i = g_audio_pattern_interval;
  215 
  216         sc->sc_tx_interval = i;
  217 
  218         if (i <= 0)
  219                 i = 1;
  220         else if (i > 1023)
  221                 i = 1023;
  222 
  223         i = USB_MS_TO_TICKS(i);
  224 
  225         usb_callout_reset(&sc->sc_callout, i, &g_audio_timeout, sc);
  226 }
  227 
  228 static void
  229 g_audio_timeout(void *arg)
  230 {
  231         struct g_audio_softc *sc = arg;
  232 
  233         sc->sc_mode = g_audio_mode;
  234 
  235         memcpy(sc->sc_pattern, g_audio_pattern_data, sizeof(sc->sc_pattern));
  236 
  237         sc->sc_pattern[G_AUDIO_MAX_STRLEN - 1] = 0;
  238 
  239         sc->sc_pattern_len = strlen(sc->sc_pattern);
  240 
  241         if (sc->sc_mode != G_AUDIO_MODE_LOOP) {
  242                 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC0_WR]);
  243                 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC1_WR]);
  244         }
  245         g_audio_timeout_reset(sc);
  246 }
  247 
  248 static void
  249 g_audio_watchdog_reset(struct g_audio_softc *sc)
  250 {
  251         usb_callout_reset(&sc->sc_watchdog, hz, &g_audio_watchdog, sc);
  252 }
  253 
  254 static void
  255 g_audio_watchdog(void *arg)
  256 {
  257         struct g_audio_softc *sc = arg;
  258         int i;
  259 
  260         i = sc->sc_throughput;
  261 
  262         sc->sc_throughput = 0;
  263 
  264         g_audio_throughput = i;
  265 
  266         g_audio_watchdog_reset(sc);
  267 }
  268 
  269 static int
  270 g_audio_probe(device_t dev)
  271 {
  272         struct usb_attach_arg *uaa = device_get_ivars(dev);
  273 
  274         DPRINTFN(11, "\n");
  275 
  276         if (uaa->usb_mode != USB_MODE_DEVICE)
  277                 return (ENXIO);
  278 
  279         if ((uaa->info.bInterfaceClass == UICLASS_AUDIO) &&
  280             (uaa->info.bInterfaceSubClass == UISUBCLASS_AUDIOCONTROL))
  281                 return (0);
  282 
  283         return (ENXIO);
  284 }
  285 
  286 static int
  287 g_audio_attach(device_t dev)
  288 {
  289         struct g_audio_softc *sc = device_get_softc(dev);
  290         struct usb_attach_arg *uaa = device_get_ivars(dev);
  291         int error;
  292         int i;
  293         uint8_t iface_index[3];
  294 
  295         DPRINTFN(11, "\n");
  296 
  297         device_set_usb_desc(dev);
  298 
  299         mtx_init(&sc->sc_mtx, "g_audio", NULL, MTX_DEF);
  300 
  301         usb_callout_init_mtx(&sc->sc_callout, &sc->sc_mtx, 0);
  302         usb_callout_init_mtx(&sc->sc_watchdog, &sc->sc_mtx, 0);
  303 
  304         sc->sc_mode = G_AUDIO_MODE_SILENT;
  305 
  306         sc->sc_noise_rem = 1;
  307 
  308         for (i = 0; i != G_AUDIO_FRAMES; i++) {
  309                 sc->sc_data_len[0][i] = G_AUDIO_BUFSIZE / G_AUDIO_FRAMES;
  310                 sc->sc_data_len[1][i] = G_AUDIO_BUFSIZE / G_AUDIO_FRAMES;
  311         }
  312 
  313         iface_index[0] = uaa->info.bIfaceIndex;
  314         iface_index[1] = uaa->info.bIfaceIndex + 1;
  315         iface_index[2] = uaa->info.bIfaceIndex + 2;
  316 
  317         error = usbd_set_alt_interface_index(uaa->device, iface_index[1], 1);
  318         if (error) {
  319                 DPRINTF("alt iface setting error=%s\n", usbd_errstr(error));
  320                 goto detach;
  321         }
  322         error = usbd_set_alt_interface_index(uaa->device, iface_index[2], 1);
  323         if (error) {
  324                 DPRINTF("alt iface setting error=%s\n", usbd_errstr(error));
  325                 goto detach;
  326         }
  327         error = usbd_transfer_setup(uaa->device,
  328             iface_index, sc->sc_xfer, g_audio_config,
  329             G_AUDIO_N_TRANSFER, sc, &sc->sc_mtx);
  330 
  331         if (error) {
  332                 DPRINTF("error=%s\n", usbd_errstr(error));
  333                 goto detach;
  334         }
  335         usbd_set_parent_iface(uaa->device, iface_index[1], iface_index[0]);
  336         usbd_set_parent_iface(uaa->device, iface_index[2], iface_index[0]);
  337 
  338         mtx_lock(&sc->sc_mtx);
  339 
  340         usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC0_RD]);
  341         usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC1_RD]);
  342 
  343         usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC0_WR]);
  344         usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC1_WR]);
  345 
  346         g_audio_timeout_reset(sc);
  347 
  348         g_audio_watchdog_reset(sc);
  349 
  350         mtx_unlock(&sc->sc_mtx);
  351 
  352         return (0);                     /* success */
  353 
  354 detach:
  355         g_audio_detach(dev);
  356 
  357         return (ENXIO);                 /* error */
  358 }
  359 
  360 static int
  361 g_audio_detach(device_t dev)
  362 {
  363         struct g_audio_softc *sc = device_get_softc(dev);
  364 
  365         DPRINTF("\n");
  366 
  367         mtx_lock(&sc->sc_mtx);
  368         usb_callout_stop(&sc->sc_callout);
  369         usb_callout_stop(&sc->sc_watchdog);
  370         mtx_unlock(&sc->sc_mtx);
  371 
  372         usbd_transfer_unsetup(sc->sc_xfer, G_AUDIO_N_TRANSFER);
  373 
  374         usb_callout_drain(&sc->sc_callout);
  375         usb_callout_drain(&sc->sc_watchdog);
  376 
  377         mtx_destroy(&sc->sc_mtx);
  378 
  379         return (0);
  380 }
  381 
  382 static int32_t
  383 g_noise(struct g_audio_softc *sc)
  384 {
  385         uint32_t temp;
  386         const uint32_t prime = 0xFFFF1D;
  387 
  388         if (sc->sc_noise_rem & 1) {
  389                 sc->sc_noise_rem += prime;
  390         }
  391         sc->sc_noise_rem /= 2;
  392 
  393         temp = sc->sc_noise_rem;
  394 
  395         /* unsigned to signed conversion */
  396 
  397         temp ^= 0x800000;
  398         if (temp & 0x800000) {
  399                 temp |= (-0x800000);
  400         }
  401         return temp;
  402 }
  403 
  404 static void
  405 g_audio_make_samples(struct g_audio_softc *sc, int16_t *ptr, int samples)
  406 {
  407         int i;
  408         int j;
  409 
  410         for (i = 0; i != samples; i++) {
  411                 j = g_noise(sc);
  412 
  413                 if ((sc->sc_state < 0) || (sc->sc_state >= sc->sc_pattern_len))
  414                         sc->sc_state = 0;
  415 
  416                 if (sc->sc_pattern_len != 0) {
  417                         j = (j * sc->sc_pattern[sc->sc_state]) >> 16;
  418                         sc->sc_state++;
  419                 }
  420                 *ptr++ = j / 256;
  421                 *ptr++ = j / 256;
  422         }
  423 }
  424 
  425 static void
  426 g_audio_isoc_write_callback(struct usb_xfer *xfer, usb_error_t error)
  427 {
  428         struct g_audio_softc *sc = usbd_xfer_softc(xfer);
  429         int actlen;
  430         int aframes;
  431         int nr = (xfer == sc->sc_xfer[G_AUDIO_ISOC0_WR]) ? 0 : 1;
  432         int16_t *ptr;
  433         int i;
  434 
  435         usbd_xfer_status(xfer, &actlen, NULL, &aframes, NULL);
  436 
  437         DPRINTF("st=%d aframes=%d actlen=%d bytes\n",
  438             USB_GET_STATE(xfer), aframes, actlen);
  439 
  440         switch (USB_GET_STATE(xfer)) {
  441         case USB_ST_TRANSFERRED:
  442 
  443                 sc->sc_throughput += actlen;
  444 
  445                 if (sc->sc_mode == G_AUDIO_MODE_LOOP)
  446                         break;          /* sync with RX */
  447 
  448         case USB_ST_SETUP:
  449 tr_setup:
  450 
  451                 ptr = sc->sc_data_buf[nr];
  452 
  453                 if (sc->sc_mode == G_AUDIO_MODE_PATTERN) {
  454                         for (i = 0; i != G_AUDIO_FRAMES; i++) {
  455                                 usbd_xfer_set_frame_data(xfer, i, ptr, sc->sc_data_len[nr][i]);
  456 
  457                                 g_audio_make_samples(sc, ptr, (G_AUDIO_BUFSIZE / G_AUDIO_FRAMES) / 2);
  458 
  459                                 ptr += (G_AUDIO_BUFSIZE / G_AUDIO_FRAMES) / 2;
  460                         }
  461                 } else if (sc->sc_mode == G_AUDIO_MODE_LOOP) {
  462                         for (i = 0; i != G_AUDIO_FRAMES; i++) {
  463                                 usbd_xfer_set_frame_data(xfer, i, ptr, sc->sc_data_len[nr][i] & ~3);
  464 
  465                                 g_audio_make_samples(sc, ptr, sc->sc_data_len[nr][i] / 4);
  466 
  467                                 ptr += (G_AUDIO_BUFSIZE / G_AUDIO_FRAMES) / 2;
  468                         }
  469                 }
  470                 break;
  471 
  472         default:                        /* Error */
  473                 DPRINTF("error=%s\n", usbd_errstr(error));
  474 
  475                 if (error != USB_ERR_CANCELLED) {
  476                         /* try to clear stall first */
  477                         usbd_xfer_set_stall(xfer);
  478                         goto tr_setup;
  479                 }
  480                 break;
  481         }
  482 }
  483 
  484 static void
  485 g_audio_isoc_read_callback(struct usb_xfer *xfer, usb_error_t error)
  486 {
  487         struct g_audio_softc *sc = usbd_xfer_softc(xfer);
  488         int actlen;
  489         int aframes;
  490         int nr = (xfer == sc->sc_xfer[G_AUDIO_ISOC0_RD]) ? 0 : 1;
  491         int16_t *ptr;
  492         int i;
  493 
  494         usbd_xfer_status(xfer, &actlen, NULL, &aframes, NULL);
  495 
  496         DPRINTF("st=%d aframes=%d actlen=%d bytes\n",
  497             USB_GET_STATE(xfer), aframes, actlen);
  498 
  499         switch (USB_GET_STATE(xfer)) {
  500         case USB_ST_TRANSFERRED:
  501 
  502                 sc->sc_throughput += actlen;
  503 
  504                 for (i = 0; i != G_AUDIO_FRAMES; i++) {
  505                         sc->sc_data_len[nr][i] = usbd_xfer_frame_len(xfer, i);
  506                 }
  507 
  508                 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC0_WR]);
  509                 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC1_WR]);
  510 
  511                 break;
  512 
  513         case USB_ST_SETUP:
  514 tr_setup:
  515                 ptr = sc->sc_data_buf[nr];
  516 
  517                 for (i = 0; i != G_AUDIO_FRAMES; i++) {
  518                         usbd_xfer_set_frame_data(xfer, i, ptr,
  519                             G_AUDIO_BUFSIZE / G_AUDIO_FRAMES);
  520 
  521                         ptr += (G_AUDIO_BUFSIZE / G_AUDIO_FRAMES) / 2;
  522                 }
  523 
  524                 usbd_transfer_submit(xfer);
  525                 break;
  526 
  527         default:                        /* Error */
  528                 DPRINTF("error=%s\n", usbd_errstr(error));
  529 
  530                 if (error != USB_ERR_CANCELLED) {
  531                         /* try to clear stall first */
  532                         usbd_xfer_set_stall(xfer);
  533                         goto tr_setup;
  534                 }
  535                 break;
  536         }
  537 }
  538 
  539 static int
  540 g_audio_handle_request(device_t dev,
  541     const void *preq, void **pptr, uint16_t *plen,
  542     uint16_t offset, uint8_t *pstate)
  543 {
  544         struct g_audio_softc *sc = device_get_softc(dev);
  545         const struct usb_device_request *req = preq;
  546         uint8_t is_complete = *pstate;
  547 
  548         if (!is_complete) {
  549                 if ((req->bmRequestType == UT_READ_CLASS_INTERFACE) &&
  550                     (req->bRequest == 0x82 /* get min */ )) {
  551                         if (offset == 0) {
  552                                 USETW(sc->sc_volume_limit, 0);
  553                                 *plen = 2;
  554                                 *pptr = &sc->sc_volume_limit;
  555                         } else {
  556                                 *plen = 0;
  557                         }
  558                         return (0);
  559                 } else if ((req->bmRequestType == UT_READ_CLASS_INTERFACE) &&
  560                     (req->bRequest == 0x83 /* get max */ )) {
  561                         if (offset == 0) {
  562                                 USETW(sc->sc_volume_limit, 0x2000);
  563                                 *plen = 2;
  564                                 *pptr = &sc->sc_volume_limit;
  565                         } else {
  566                                 *plen = 0;
  567                         }
  568                         return (0);
  569                 } else if ((req->bmRequestType == UT_READ_CLASS_INTERFACE) &&
  570                     (req->bRequest == 0x84 /* get residue */ )) {
  571                         if (offset == 0) {
  572                                 USETW(sc->sc_volume_limit, 1);
  573                                 *plen = 2;
  574                                 *pptr = &sc->sc_volume_limit;
  575                         } else {
  576                                 *plen = 0;
  577                         }
  578                         return (0);
  579                 } else if ((req->bmRequestType == UT_READ_CLASS_INTERFACE) &&
  580                     (req->bRequest == 0x81 /* get value */ )) {
  581                         if (offset == 0) {
  582                                 USETW(sc->sc_volume_setting, 0x2000);
  583                                 *plen = sizeof(sc->sc_volume_setting);
  584                                 *pptr = &sc->sc_volume_setting;
  585                         } else {
  586                                 *plen = 0;
  587                         }
  588                         return (0);
  589                 } else if ((req->bmRequestType == UT_WRITE_CLASS_INTERFACE) &&
  590                     (req->bRequest == 0x01 /* set value */ )) {
  591                         if (offset == 0) {
  592                                 *plen = sizeof(sc->sc_volume_setting);
  593                                 *pptr = &sc->sc_volume_setting;
  594                         } else {
  595                                 *plen = 0;
  596                         }
  597                         return (0);
  598                 } else if ((req->bmRequestType == UT_WRITE_CLASS_ENDPOINT) &&
  599                     (req->bRequest == 0x01 /* set value */ )) {
  600                         if (offset == 0) {
  601                                 *plen = sizeof(sc->sc_sample_rate);
  602                                 *pptr = &sc->sc_sample_rate;
  603                         } else {
  604                                 *plen = 0;
  605                         }
  606                         return (0);
  607                 }
  608         }
  609         return (ENXIO);                 /* use builtin handler */
  610 }
Cache object: e30d76a811278890a65ae9d32b2b4635
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/dev/usb/gadget/g_audio.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/usb/gadget/g_audio.c
