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/utsname.h> 16 17#include "u_audio.h" 18 19#define DRIVER_DESC "Linux USB Audio Gadget" 20#define DRIVER_VERSION "Dec 18, 2008" 21 22/*-------------------------------------------------------------------------*/ 23 24/* 25 * Kbuild is not very cooperative with respect to linking separately 26 * compiled library objects into one module. So for now we won't use 27 * separate compilation ... ensuring init/exit sections work to shrink 28 * the runtime footprint, and giving us at least some parts of what 29 * a "gcc --combine ... part1.c part2.c part3.c ... " build would. 30 */ 31#include "composite.c" 32#include "usbstring.c" 33#include "config.c" 34#include "epautoconf.c" 35 36#include "u_audio.c" 37#include "f_audio.c" 38 39/*-------------------------------------------------------------------------*/ 40 41/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! 42 * Instead: allocate your own, using normal USB-IF procedures. 43 */ 44 45/* Thanks to Linux Foundation for donating this product ID. */ 46#define AUDIO_VENDOR_NUM 0x1d6b /* Linux Foundation */ 47#define AUDIO_PRODUCT_NUM 0x0101 /* Linux-USB Audio Gadget */ 48 49/*-------------------------------------------------------------------------*/ 50 51static struct usb_device_descriptor device_desc = { 52 .bLength = sizeof device_desc, 53 .bDescriptorType = USB_DT_DEVICE, 54 55 .bcdUSB = __constant_cpu_to_le16(0x200), 56 57 .bDeviceClass = USB_CLASS_PER_INTERFACE, 58 .bDeviceSubClass = 0, 59 .bDeviceProtocol = 0, 60 /* .bMaxPacketSize0 = f(hardware) */ 61 62 /* Vendor and product id defaults change according to what configs 63 * we support. (As does bNumConfigurations.) These values can 64 * also be overridden by module parameters. 65 */ 66 .idVendor = __constant_cpu_to_le16(AUDIO_VENDOR_NUM), 67 .idProduct = __constant_cpu_to_le16(AUDIO_PRODUCT_NUM), 68 /* .bcdDevice = f(hardware) */ 69 /* .iManufacturer = DYNAMIC */ 70 /* .iProduct = DYNAMIC */ 71 /* NO SERIAL NUMBER */ 72 .bNumConfigurations = 1, 73}; 74 75static struct usb_otg_descriptor otg_descriptor = { 76 .bLength = sizeof otg_descriptor, 77 .bDescriptorType = USB_DT_OTG, 78 79 /* REVISIT SRP-only hardware is possible, although 80 * it would not be called "OTG" ... 81 */ 82 .bmAttributes = USB_OTG_SRP | USB_OTG_HNP, 83}; 84 85static const struct usb_descriptor_header *otg_desc[] = { 86 (struct usb_descriptor_header *) &otg_descriptor, 87 NULL, 88}; 89 90/*-------------------------------------------------------------------------*/ 91 92static int __ref audio_do_config(struct usb_configuration *c) 93{ 94 95 if (gadget_is_otg(c->cdev->gadget)) { 96 c->descriptors = otg_desc; 97 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; 98 } 99 100 audio_bind_config(c); 101 102 return 0; 103} 104 105static struct usb_configuration audio_config_driver = { 106 .label = DRIVER_DESC, 107 .bind = audio_do_config, 108 .bConfigurationValue = 1, 109 /* .iConfiguration = DYNAMIC */ 110 .bmAttributes = USB_CONFIG_ATT_SELFPOWER, 111}; 112 113/*-------------------------------------------------------------------------*/ 114 115static int __ref audio_bind(struct usb_composite_dev *cdev) 116{ 117 int gcnum; 118 int status; 119 120 gcnum = usb_gadget_controller_number(cdev->gadget); 121 if (gcnum >= 0) 122 device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum); 123 else { 124 ERROR(cdev, "controller '%s' not recognized; trying %s\n", 125 cdev->gadget->name, 126 audio_config_driver.label); 127 device_desc.bcdDevice = 128 __constant_cpu_to_le16(0x0300 | 0x0099); 129 } 130 131 /* device descriptor strings: manufacturer, product */ 132 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s", 133 init_utsname()->sysname, init_utsname()->release, 134 cdev->gadget->name); 135 status = usb_string_id(cdev); 136 if (status < 0) 137 goto fail; 138 strings_dev[STRING_MANUFACTURER_IDX].id = status; 139 device_desc.iManufacturer = status; 140 141 status = usb_string_id(cdev); 142 if (status < 0) 143 goto fail; 144 strings_dev[STRING_PRODUCT_IDX].id = status; 145 device_desc.iProduct = status; 146 147 status = usb_add_config(cdev, &audio_config_driver); 148 if (status < 0) 149 goto fail; 150 151 INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION); 152 return 0; 153 154fail: 155 return status; 156} 157 158static int __exit audio_unbind(struct usb_composite_dev *cdev) 159{ 160 gaudio_cleanup(); 161 return 0; 162} 163 164static struct usb_composite_driver audio_driver = { 165 .name = "g_audio", 166 .dev = &device_desc, 167 .strings = audio_strings, 168 .bind = audio_bind, 169 .unbind = __exit_p(audio_unbind), 170}; 171 172static int __init init(void) 173{ 174 return usb_composite_register(&audio_driver); 175} 176module_init(init); 177 178static void __exit cleanup(void) 179{ 180 usb_composite_unregister(&audio_driver); 181} 182module_exit(cleanup); 183 184MODULE_DESCRIPTION(DRIVER_DESC); 185MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>"); 186MODULE_LICENSE("GPL"); 187