191 lines
4.6 KiB
C
191 lines
4.6 KiB
C
/*
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* audio.c -- Audio gadget driver
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*
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* Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
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* Copyright (C) 2008 Analog Devices, Inc
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*
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* Enter bugs at http://blackfin.uclinux.org/
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*
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* Licensed under the GPL-2 or later.
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*/
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/* #define VERBOSE_DEBUG */
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/usb/composite.h>
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#include "gadget_chips.h"
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#define DRIVER_DESC "Linux USB Audio Gadget"
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#define DRIVER_VERSION "Feb 2, 2012"
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USB_GADGET_COMPOSITE_OPTIONS();
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/* string IDs are assigned dynamically */
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static struct usb_string strings_dev[] = {
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[USB_GADGET_MANUFACTURER_IDX].s = "",
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[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
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[USB_GADGET_SERIAL_IDX].s = "",
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab_dev = {
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.language = 0x0409, /* en-us */
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.strings = strings_dev,
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};
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static struct usb_gadget_strings *audio_strings[] = {
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&stringtab_dev,
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NULL,
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};
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#ifdef CONFIG_GADGET_UAC1
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#include "u_uac1.h"
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#include "u_uac1.c"
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#include "f_uac1.c"
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#else
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#include "f_uac2.c"
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#endif
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/*-------------------------------------------------------------------------*/
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/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
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* Instead: allocate your own, using normal USB-IF procedures.
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*/
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/* Thanks to Linux Foundation for donating this product ID. */
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#define AUDIO_VENDOR_NUM 0x1d6b /* Linux Foundation */
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#define AUDIO_PRODUCT_NUM 0x0101 /* Linux-USB Audio Gadget */
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/*-------------------------------------------------------------------------*/
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static struct usb_device_descriptor device_desc = {
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.bLength = sizeof device_desc,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = __constant_cpu_to_le16(0x200),
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#ifdef CONFIG_GADGET_UAC1
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.bDeviceClass = USB_CLASS_PER_INTERFACE,
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.bDeviceSubClass = 0,
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.bDeviceProtocol = 0,
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#else
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.bDeviceClass = USB_CLASS_MISC,
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.bDeviceSubClass = 0x02,
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.bDeviceProtocol = 0x01,
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#endif
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/* .bMaxPacketSize0 = f(hardware) */
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/* Vendor and product id defaults change according to what configs
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* we support. (As does bNumConfigurations.) These values can
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* also be overridden by module parameters.
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*/
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.idVendor = __constant_cpu_to_le16(AUDIO_VENDOR_NUM),
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.idProduct = __constant_cpu_to_le16(AUDIO_PRODUCT_NUM),
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/* .bcdDevice = f(hardware) */
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/* .iManufacturer = DYNAMIC */
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/* .iProduct = DYNAMIC */
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/* NO SERIAL NUMBER */
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.bNumConfigurations = 1,
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};
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static struct usb_otg_descriptor otg_descriptor = {
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.bLength = sizeof otg_descriptor,
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.bDescriptorType = USB_DT_OTG,
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/* REVISIT SRP-only hardware is possible, although
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* it would not be called "OTG" ...
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*/
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.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
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};
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static const struct usb_descriptor_header *otg_desc[] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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NULL,
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};
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/*-------------------------------------------------------------------------*/
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static int __init audio_do_config(struct usb_configuration *c)
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{
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/* FIXME alloc iConfiguration string, set it in c->strings */
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if (gadget_is_otg(c->cdev->gadget)) {
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c->descriptors = otg_desc;
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c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
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}
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audio_bind_config(c);
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return 0;
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}
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static struct usb_configuration audio_config_driver = {
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.label = DRIVER_DESC,
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.bConfigurationValue = 1,
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/* .iConfiguration = DYNAMIC */
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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#ifndef CONFIG_GADGET_UAC1
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.unbind = uac2_unbind_config,
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#endif
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};
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/*-------------------------------------------------------------------------*/
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static int __init audio_bind(struct usb_composite_dev *cdev)
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{
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int status;
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status = usb_string_ids_tab(cdev, strings_dev);
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if (status < 0)
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goto fail;
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device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
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device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
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status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
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if (status < 0)
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goto fail;
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usb_composite_overwrite_options(cdev, &coverwrite);
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INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
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return 0;
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fail:
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return status;
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}
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static int __exit audio_unbind(struct usb_composite_dev *cdev)
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{
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#ifdef CONFIG_GADGET_UAC1
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gaudio_cleanup();
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#endif
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return 0;
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}
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static __refdata struct usb_composite_driver audio_driver = {
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.name = "g_audio",
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.dev = &device_desc,
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.strings = audio_strings,
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.max_speed = USB_SPEED_HIGH,
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.bind = audio_bind,
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.unbind = __exit_p(audio_unbind),
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};
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static int __init init(void)
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{
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return usb_composite_probe(&audio_driver);
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}
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module_init(init);
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static void __exit cleanup(void)
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{
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usb_composite_unregister(&audio_driver);
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}
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module_exit(cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
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MODULE_LICENSE("GPL");
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