LXR linux/drivers/usb/gadget/legacy/audio.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * audio.c -- Audio gadget driver
   4 *
   5 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
   6 * Copyright (C) 2008 Analog Devices, Inc
   7 */
   8
   9/* #define VERBOSE_DEBUG */
  10
  11#include <linux/kernel.h>
  12#include <linux/module.h>
  13#include <linux/usb/composite.h>
  14
  15#define DRIVER_DESC             "Linux USB Audio Gadget"
  16#define DRIVER_VERSION          "Feb 2, 2012"
  17
  18USB_GADGET_COMPOSITE_OPTIONS();
  19
  20#ifndef CONFIG_GADGET_UAC1
  21#include "u_uac2.h"
  22
  23/* Playback(USB-IN) Default Stereo - Fl/Fr */
  24static int p_chmask = UAC2_DEF_PCHMASK;
  25module_param(p_chmask, uint, S_IRUGO);
  26MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
  27
  28/* Playback Default 48 KHz */
  29static int p_srate = UAC2_DEF_PSRATE;
  30module_param(p_srate, uint, S_IRUGO);
  31MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
  32
  33/* Playback Default 16bits/sample */
  34static int p_ssize = UAC2_DEF_PSSIZE;
  35module_param(p_ssize, uint, S_IRUGO);
  36MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");
  37
  38/* Capture(USB-OUT) Default Stereo - Fl/Fr */
  39static int c_chmask = UAC2_DEF_CCHMASK;
  40module_param(c_chmask, uint, S_IRUGO);
  41MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
  42
  43/* Capture Default 64 KHz */
  44static int c_srate = UAC2_DEF_CSRATE;
  45module_param(c_srate, uint, S_IRUGO);
  46MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
  47
  48/* Capture Default 16bits/sample */
  49static int c_ssize = UAC2_DEF_CSSIZE;
  50module_param(c_ssize, uint, S_IRUGO);
  51MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
  52#else
  53#ifndef CONFIG_GADGET_UAC1_LEGACY
  54#include "u_uac1.h"
  55
  56/* Playback(USB-IN) Default Stereo - Fl/Fr */
  57static int p_chmask = UAC1_DEF_PCHMASK;
  58module_param(p_chmask, uint, S_IRUGO);
  59MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
  60
  61/* Playback Default 48 KHz */
  62static int p_srate = UAC1_DEF_PSRATE;
  63module_param(p_srate, uint, S_IRUGO);
  64MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
  65
  66/* Playback Default 16bits/sample */
  67static int p_ssize = UAC1_DEF_PSSIZE;
  68module_param(p_ssize, uint, S_IRUGO);
  69MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");
  70
  71/* Capture(USB-OUT) Default Stereo - Fl/Fr */
  72static int c_chmask = UAC1_DEF_CCHMASK;
  73module_param(c_chmask, uint, S_IRUGO);
  74MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
  75
  76/* Capture Default 48 KHz */
  77static int c_srate = UAC1_DEF_CSRATE;
  78module_param(c_srate, uint, S_IRUGO);
  79MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
  80
  81/* Capture Default 16bits/sample */
  82static int c_ssize = UAC1_DEF_CSSIZE;
  83module_param(c_ssize, uint, S_IRUGO);
  84MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
  85#else /* CONFIG_GADGET_UAC1_LEGACY */
  86#include "u_uac1_legacy.h"
  87
  88static char *fn_play = FILE_PCM_PLAYBACK;
  89module_param(fn_play, charp, S_IRUGO);
  90MODULE_PARM_DESC(fn_play, "Playback PCM device file name");
  91
  92static char *fn_cap = FILE_PCM_CAPTURE;
  93module_param(fn_cap, charp, S_IRUGO);
  94MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");
  95
  96static char *fn_cntl = FILE_CONTROL;
  97module_param(fn_cntl, charp, S_IRUGO);
  98MODULE_PARM_DESC(fn_cntl, "Control device file name");
  99
 100static int req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
 101module_param(req_buf_size, int, S_IRUGO);
 102MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
 103
 104static int req_count = UAC1_REQ_COUNT;
 105module_param(req_count, int, S_IRUGO);
 106MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
 107
 108static int audio_buf_size = UAC1_AUDIO_BUF_SIZE;
 109module_param(audio_buf_size, int, S_IRUGO);
 110MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
 111#endif /* CONFIG_GADGET_UAC1_LEGACY */
 112#endif
 113
 114/* string IDs are assigned dynamically */
 115
 116static struct usb_string strings_dev[] = {
 117        [USB_GADGET_MANUFACTURER_IDX].s = "",
 118        [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
 119        [USB_GADGET_SERIAL_IDX].s = "",
 120        {  } /* end of list */
 121};
 122
 123static struct usb_gadget_strings stringtab_dev = {
 124        .language = 0x0409,     /* en-us */
 125        .strings = strings_dev,
 126};
 127
 128static struct usb_gadget_strings *audio_strings[] = {
 129        &stringtab_dev,
 130        NULL,
 131};
 132
 133#ifndef CONFIG_GADGET_UAC1
 134static struct usb_function_instance *fi_uac2;
 135static struct usb_function *f_uac2;
 136#else
 137static struct usb_function_instance *fi_uac1;
 138static struct usb_function *f_uac1;
 139#endif
 140
 141/*-------------------------------------------------------------------------*/
 142
 143/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 144 * Instead:  allocate your own, using normal USB-IF procedures.
 145 */
 146
 147/* Thanks to Linux Foundation for donating this product ID. */
 148#define AUDIO_VENDOR_NUM                0x1d6b  /* Linux Foundation */
 149#define AUDIO_PRODUCT_NUM               0x0101  /* Linux-USB Audio Gadget */
 150
 151/*-------------------------------------------------------------------------*/
 152
 153static struct usb_device_descriptor device_desc = {
 154        .bLength =              sizeof device_desc,
 155        .bDescriptorType =      USB_DT_DEVICE,
 156
 157        /* .bcdUSB = DYNAMIC */
 158
 159#ifdef CONFIG_GADGET_UAC1_LEGACY
 160        .bDeviceClass =         USB_CLASS_PER_INTERFACE,
 161        .bDeviceSubClass =      0,
 162        .bDeviceProtocol =      0,
 163#else
 164        .bDeviceClass =         USB_CLASS_MISC,
 165        .bDeviceSubClass =      0x02,
 166        .bDeviceProtocol =      0x01,
 167#endif
 168        /* .bMaxPacketSize0 = f(hardware) */
 169
 170        /* Vendor and product id defaults change according to what configs
 171         * we support.  (As does bNumConfigurations.)  These values can
 172         * also be overridden by module parameters.
 173         */
 174        .idVendor =             cpu_to_le16(AUDIO_VENDOR_NUM),
 175        .idProduct =            cpu_to_le16(AUDIO_PRODUCT_NUM),
 176        /* .bcdDevice = f(hardware) */
 177        /* .iManufacturer = DYNAMIC */
 178        /* .iProduct = DYNAMIC */
 179        /* NO SERIAL NUMBER */
 180        .bNumConfigurations =   1,
 181};
 182
 183static const struct usb_descriptor_header *otg_desc[2];
 184
 185/*-------------------------------------------------------------------------*/
 186
 187static int audio_do_config(struct usb_configuration *c)
 188{
 189        int status;
 190
 191        /* FIXME alloc iConfiguration string, set it in c->strings */
 192
 193        if (gadget_is_otg(c->cdev->gadget)) {
 194                c->descriptors = otg_desc;
 195                c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 196        }
 197
 198#ifdef CONFIG_GADGET_UAC1
 199        f_uac1 = usb_get_function(fi_uac1);
 200        if (IS_ERR(f_uac1)) {
 201                status = PTR_ERR(f_uac1);
 202                return status;
 203        }
 204
 205        status = usb_add_function(c, f_uac1);
 206        if (status < 0) {
 207                usb_put_function(f_uac1);
 208                return status;
 209        }
 210#else
 211        f_uac2 = usb_get_function(fi_uac2);
 212        if (IS_ERR(f_uac2)) {
 213                status = PTR_ERR(f_uac2);
 214                return status;
 215        }
 216
 217        status = usb_add_function(c, f_uac2);
 218        if (status < 0) {
 219                usb_put_function(f_uac2);
 220                return status;
 221        }
 222#endif
 223
 224        return 0;
 225}
 226
 227static struct usb_configuration audio_config_driver = {
 228        .label                  = DRIVER_DESC,
 229        .bConfigurationValue    = 1,
 230        /* .iConfiguration = DYNAMIC */
 231        .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 232};
 233
 234/*-------------------------------------------------------------------------*/
 235
 236static int audio_bind(struct usb_composite_dev *cdev)
 237{
 238#ifndef CONFIG_GADGET_UAC1
 239        struct f_uac2_opts      *uac2_opts;
 240#else
 241#ifndef CONFIG_GADGET_UAC1_LEGACY
 242        struct f_uac1_opts      *uac1_opts;
 243#else
 244        struct f_uac1_legacy_opts       *uac1_opts;
 245#endif
 246#endif
 247        int                     status;
 248
 249#ifndef CONFIG_GADGET_UAC1
 250        fi_uac2 = usb_get_function_instance("uac2");
 251        if (IS_ERR(fi_uac2))
 252                return PTR_ERR(fi_uac2);
 253#else
 254#ifndef CONFIG_GADGET_UAC1_LEGACY
 255        fi_uac1 = usb_get_function_instance("uac1");
 256#else
 257        fi_uac1 = usb_get_function_instance("uac1_legacy");
 258#endif
 259        if (IS_ERR(fi_uac1))
 260                return PTR_ERR(fi_uac1);
 261#endif
 262
 263#ifndef CONFIG_GADGET_UAC1
 264        uac2_opts = container_of(fi_uac2, struct f_uac2_opts, func_inst);
 265        uac2_opts->p_chmask = p_chmask;
 266        uac2_opts->p_srate = p_srate;
 267        uac2_opts->p_ssize = p_ssize;
 268        uac2_opts->c_chmask = c_chmask;
 269        uac2_opts->c_srate = c_srate;
 270        uac2_opts->c_ssize = c_ssize;
 271        uac2_opts->req_number = UAC2_DEF_REQ_NUM;
 272#else
 273#ifndef CONFIG_GADGET_UAC1_LEGACY
 274        uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst);
 275        uac1_opts->p_chmask = p_chmask;
 276        uac1_opts->p_srate = p_srate;
 277        uac1_opts->p_ssize = p_ssize;
 278        uac1_opts->c_chmask = c_chmask;
 279        uac1_opts->c_srate = c_srate;
 280        uac1_opts->c_ssize = c_ssize;
 281        uac1_opts->req_number = UAC1_DEF_REQ_NUM;
 282#else /* CONFIG_GADGET_UAC1_LEGACY */
 283        uac1_opts = container_of(fi_uac1, struct f_uac1_legacy_opts, func_inst);
 284        uac1_opts->fn_play = fn_play;
 285        uac1_opts->fn_cap = fn_cap;
 286        uac1_opts->fn_cntl = fn_cntl;
 287        uac1_opts->req_buf_size = req_buf_size;
 288        uac1_opts->req_count = req_count;
 289        uac1_opts->audio_buf_size = audio_buf_size;
 290#endif /* CONFIG_GADGET_UAC1_LEGACY */
 291#endif
 292
 293        status = usb_string_ids_tab(cdev, strings_dev);
 294        if (status < 0)
 295                goto fail;
 296        device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
 297        device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 298
 299        if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
 300                struct usb_descriptor_header *usb_desc;
 301
 302                usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
 303                if (!usb_desc)
 304                        goto fail;
 305                usb_otg_descriptor_init(cdev->gadget, usb_desc);
 306                otg_desc[0] = usb_desc;
 307                otg_desc[1] = NULL;
 308        }
 309
 310        status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
 311        if (status < 0)
 312                goto fail_otg_desc;
 313        usb_composite_overwrite_options(cdev, &coverwrite);
 314
 315        INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
 316        return 0;
 317
 318fail_otg_desc:
 319        kfree(otg_desc[0]);
 320        otg_desc[0] = NULL;
 321fail:
 322#ifndef CONFIG_GADGET_UAC1
 323        usb_put_function_instance(fi_uac2);
 324#else
 325        usb_put_function_instance(fi_uac1);
 326#endif
 327        return status;
 328}
 329
 330static int audio_unbind(struct usb_composite_dev *cdev)
 331{
 332#ifdef CONFIG_GADGET_UAC1
 333        if (!IS_ERR_OR_NULL(f_uac1))
 334                usb_put_function(f_uac1);
 335        if (!IS_ERR_OR_NULL(fi_uac1))
 336                usb_put_function_instance(fi_uac1);
 337#else
 338        if (!IS_ERR_OR_NULL(f_uac2))
 339                usb_put_function(f_uac2);
 340        if (!IS_ERR_OR_NULL(fi_uac2))
 341                usb_put_function_instance(fi_uac2);
 342#endif
 343        kfree(otg_desc[0]);
 344        otg_desc[0] = NULL;
 345
 346        return 0;
 347}
 348
 349static struct usb_composite_driver audio_driver = {
 350        .name           = "g_audio",
 351        .dev            = &device_desc,
 352        .strings        = audio_strings,
 353        .max_speed      = USB_SPEED_HIGH,
 354        .bind           = audio_bind,
 355        .unbind         = audio_unbind,
 356};
 357
 358module_usb_composite_driver(audio_driver);
 359
 360MODULE_DESCRIPTION(DRIVER_DESC);
 361MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
 362MODULE_LICENSE("GPL");
 363
 364