mirror of https://gitee.com/openkylin/linux.git
188 lines
4.8 KiB
C
188 lines
4.8 KiB
C
/*
|
|
* audio.c -- Audio gadget driver
|
|
*
|
|
* Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
|
|
* Copyright (C) 2008 Analog Devices, Inc
|
|
*
|
|
* Enter bugs at http://blackfin.uclinux.org/
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
/* #define VERBOSE_DEBUG */
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/utsname.h>
|
|
|
|
#include "u_audio.h"
|
|
|
|
#define DRIVER_DESC "Linux USB Audio Gadget"
|
|
#define DRIVER_VERSION "Dec 18, 2008"
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Kbuild is not very cooperative with respect to linking separately
|
|
* compiled library objects into one module. So for now we won't use
|
|
* separate compilation ... ensuring init/exit sections work to shrink
|
|
* the runtime footprint, and giving us at least some parts of what
|
|
* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
|
|
*/
|
|
#include "composite.c"
|
|
#include "usbstring.c"
|
|
#include "config.c"
|
|
#include "epautoconf.c"
|
|
|
|
#include "u_audio.c"
|
|
#include "f_audio.c"
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
|
|
* Instead: allocate your own, using normal USB-IF procedures.
|
|
*/
|
|
|
|
/* Thanks to Linux Foundation for donating this product ID. */
|
|
#define AUDIO_VENDOR_NUM 0x1d6b /* Linux Foundation */
|
|
#define AUDIO_PRODUCT_NUM 0x0101 /* Linux-USB Audio Gadget */
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static struct usb_device_descriptor device_desc = {
|
|
.bLength = sizeof device_desc,
|
|
.bDescriptorType = USB_DT_DEVICE,
|
|
|
|
.bcdUSB = __constant_cpu_to_le16(0x200),
|
|
|
|
.bDeviceClass = USB_CLASS_PER_INTERFACE,
|
|
.bDeviceSubClass = 0,
|
|
.bDeviceProtocol = 0,
|
|
/* .bMaxPacketSize0 = f(hardware) */
|
|
|
|
/* Vendor and product id defaults change according to what configs
|
|
* we support. (As does bNumConfigurations.) These values can
|
|
* also be overridden by module parameters.
|
|
*/
|
|
.idVendor = __constant_cpu_to_le16(AUDIO_VENDOR_NUM),
|
|
.idProduct = __constant_cpu_to_le16(AUDIO_PRODUCT_NUM),
|
|
/* .bcdDevice = f(hardware) */
|
|
/* .iManufacturer = DYNAMIC */
|
|
/* .iProduct = DYNAMIC */
|
|
/* NO SERIAL NUMBER */
|
|
.bNumConfigurations = 1,
|
|
};
|
|
|
|
static struct usb_otg_descriptor otg_descriptor = {
|
|
.bLength = sizeof otg_descriptor,
|
|
.bDescriptorType = USB_DT_OTG,
|
|
|
|
/* REVISIT SRP-only hardware is possible, although
|
|
* it would not be called "OTG" ...
|
|
*/
|
|
.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
|
|
};
|
|
|
|
static const struct usb_descriptor_header *otg_desc[] = {
|
|
(struct usb_descriptor_header *) &otg_descriptor,
|
|
NULL,
|
|
};
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int __init audio_do_config(struct usb_configuration *c)
|
|
{
|
|
/* FIXME alloc iConfiguration string, set it in c->strings */
|
|
|
|
if (gadget_is_otg(c->cdev->gadget)) {
|
|
c->descriptors = otg_desc;
|
|
c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
|
|
}
|
|
|
|
audio_bind_config(c);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct usb_configuration audio_config_driver = {
|
|
.label = DRIVER_DESC,
|
|
.bConfigurationValue = 1,
|
|
/* .iConfiguration = DYNAMIC */
|
|
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
|
|
};
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int __init audio_bind(struct usb_composite_dev *cdev)
|
|
{
|
|
int gcnum;
|
|
int status;
|
|
|
|
gcnum = usb_gadget_controller_number(cdev->gadget);
|
|
if (gcnum >= 0)
|
|
device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
|
|
else {
|
|
ERROR(cdev, "controller '%s' not recognized; trying %s\n",
|
|
cdev->gadget->name,
|
|
audio_config_driver.label);
|
|
device_desc.bcdDevice =
|
|
__constant_cpu_to_le16(0x0300 | 0x0099);
|
|
}
|
|
|
|
/* device descriptor strings: manufacturer, product */
|
|
snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
|
|
init_utsname()->sysname, init_utsname()->release,
|
|
cdev->gadget->name);
|
|
status = usb_string_id(cdev);
|
|
if (status < 0)
|
|
goto fail;
|
|
strings_dev[STRING_MANUFACTURER_IDX].id = status;
|
|
device_desc.iManufacturer = status;
|
|
|
|
status = usb_string_id(cdev);
|
|
if (status < 0)
|
|
goto fail;
|
|
strings_dev[STRING_PRODUCT_IDX].id = status;
|
|
device_desc.iProduct = status;
|
|
|
|
status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
|
|
if (status < 0)
|
|
goto fail;
|
|
|
|
INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
|
|
return 0;
|
|
|
|
fail:
|
|
return status;
|
|
}
|
|
|
|
static int __exit audio_unbind(struct usb_composite_dev *cdev)
|
|
{
|
|
gaudio_cleanup();
|
|
return 0;
|
|
}
|
|
|
|
static struct usb_composite_driver audio_driver = {
|
|
.name = "g_audio",
|
|
.dev = &device_desc,
|
|
.strings = audio_strings,
|
|
.max_speed = USB_SPEED_HIGH,
|
|
.unbind = __exit_p(audio_unbind),
|
|
};
|
|
|
|
static int __init init(void)
|
|
{
|
|
return usb_composite_probe(&audio_driver, audio_bind);
|
|
}
|
|
module_init(init);
|
|
|
|
static void __exit cleanup(void)
|
|
{
|
|
usb_composite_unregister(&audio_driver);
|
|
}
|
|
module_exit(cleanup);
|
|
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
|
|
MODULE_LICENSE("GPL");
|
|
|