drivers/usb/gadget/audio.c

   1 /*
   2  * audio.c -- Audio gadget driver
   3  *
   4  * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
   5  * Copyright (C) 2008 Analog Devices, Inc
   6  *
   7  * Enter bugs at http://blackfin.uclinux.org/
   8  *
   9  * Licensed under the GPL-2 or later.
  10  */
  11
  12 /* #define VERBOSE_DEBUG */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/usb/composite.h>
  17
  18 #include "gadget_chips.h"
  19 #define DRIVER_DESC             "Linux USB Audio Gadget"
  20 #define DRIVER_VERSION          "Feb 2, 2012"
  21
  22 USB_GADGET_COMPOSITE_OPTIONS();
  23
  24 /* string IDs are assigned dynamically */
  25
  26 static struct usb_string strings_dev[] = {
  27         [USB_GADGET_MANUFACTURER_IDX].s = "",
  28         [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
  29         [USB_GADGET_SERIAL_IDX].s = "",
  30         {  } /* end of list */
  31 };
  32
  33 static struct usb_gadget_strings stringtab_dev = {
  34         .language = 0x0409,     /* en-us */
  35         .strings = strings_dev,
  36 };
  37
  38 static struct usb_gadget_strings *audio_strings[] = {
  39         &stringtab_dev,
  40         NULL,
  41 };
  42
  43 #ifdef CONFIG_GADGET_UAC1
  44 #include "u_uac1.h"
  45 #include "u_uac1.c"
  46 #include "f_uac1.c"
  47 #else
  48 #include "f_uac2.c"
  49 #endif
  50
  51 /*-------------------------------------------------------------------------*/
  52
  53 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
  54  * Instead:  allocate your own, using normal USB-IF procedures.
  55  */
  56
  57 /* Thanks to Linux Foundation for donating this product ID. */
  58 #define AUDIO_VENDOR_NUM                0x1d6b  /* Linux Foundation */
  59 #define AUDIO_PRODUCT_NUM               0x0101  /* Linux-USB Audio Gadget */
  60
  61 /*-------------------------------------------------------------------------*/
  62
  63 static struct usb_device_descriptor device_desc = {
  64         .bLength =              sizeof device_desc,
  65         .bDescriptorType =      USB_DT_DEVICE,
  66
  67         .bcdUSB =               __constant_cpu_to_le16(0x200),
  68
  69 #ifdef CONFIG_GADGET_UAC1
  70         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
  71         .bDeviceSubClass =      0,
  72         .bDeviceProtocol =      0,
  73 #else
  74         .bDeviceClass =         USB_CLASS_MISC,
  75         .bDeviceSubClass =      0x02,
  76         .bDeviceProtocol =      0x01,
  77 #endif
  78         /* .bMaxPacketSize0 = f(hardware) */
  79
  80         /* Vendor and product id defaults change according to what configs
  81          * we support.  (As does bNumConfigurations.)  These values can
  82          * also be overridden by module parameters.
  83          */
  84         .idVendor =             __constant_cpu_to_le16(AUDIO_VENDOR_NUM),
  85         .idProduct =            __constant_cpu_to_le16(AUDIO_PRODUCT_NUM),
  86         /* .bcdDevice = f(hardware) */
  87         /* .iManufacturer = DYNAMIC */
  88         /* .iProduct = DYNAMIC */
  89         /* NO SERIAL NUMBER */
  90         .bNumConfigurations =   1,
  91 };
  92
  93 static struct usb_otg_descriptor otg_descriptor = {
  94         .bLength =              sizeof otg_descriptor,
  95         .bDescriptorType =      USB_DT_OTG,
  96
  97         /* REVISIT SRP-only hardware is possible, although
  98          * it would not be called "OTG" ...
  99          */
 100         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
 101 };
 102
 103 static const struct usb_descriptor_header *otg_desc[] = {
 104         (struct usb_descriptor_header *) &otg_descriptor,
 105         NULL,
 106 };
 107
 108 /*-------------------------------------------------------------------------*/
 109
 110 static int __init audio_do_config(struct usb_configuration *c)
 111 {
 112         /* FIXME alloc iConfiguration string, set it in c->strings */
 113
 114         if (gadget_is_otg(c->cdev->gadget)) {
 115                 c->descriptors = otg_desc;
 116                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 117         }
 118
 119         audio_bind_config(c);
 120
 121         return 0;
 122 }
 123
 124 static struct usb_configuration audio_config_driver = {
 125         .label                  = DRIVER_DESC,
 126         .bConfigurationValue    = 1,
 127         /* .iConfiguration = DYNAMIC */
 128         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 129 #ifndef CONFIG_GADGET_UAC1
 130         .unbind                 = uac2_unbind_config,
 131 #endif
 132 };
 133
 134 /*-------------------------------------------------------------------------*/
 135
 136 static int __init audio_bind(struct usb_composite_dev *cdev)
 137 {
 138         int                     status;
 139
 140         status = usb_string_ids_tab(cdev, strings_dev);
 141         if (status < 0)
 142                 goto fail;
 143         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
 144         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 145
 146         status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
 147         if (status < 0)
 148                 goto fail;
 149         usb_composite_overwrite_options(cdev, &coverwrite);
 150
 151         INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
 152         return 0;
 153
 154 fail:
 155         return status;
 156 }
 157
 158 static int __exit audio_unbind(struct usb_composite_dev *cdev)
 159 {
 160 #ifdef CONFIG_GADGET_UAC1
 161         gaudio_cleanup();
 162 #endif
 163         return 0;
 164 }
 165
 166 static __refdata struct usb_composite_driver audio_driver = {
 167         .name           = "g_audio",
 168         .dev            = &device_desc,
 169         .strings        = audio_strings,
 170         .max_speed      = USB_SPEED_HIGH,
 171         .bind           = audio_bind,
 172         .unbind         = __exit_p(audio_unbind),
 173 };
 174
 175 static int __init init(void)
 176 {
 177         return usb_composite_probe(&audio_driver);
 178 }
 179 module_init(init);
 180
 181 static void __exit cleanup(void)
 182 {
 183         usb_composite_unregister(&audio_driver);
 184 }
 185 module_exit(cleanup);
 186
 187 MODULE_DESCRIPTION(DRIVER_DESC);
 188 MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
 189 MODULE_LICENSE("GPL");
 190