303 lines
7.4 KiB
C
303 lines
7.4 KiB
C
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/*
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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/utsname.h>
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#include "u_audio.h"
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#define DRIVER_DESC "Linux USB Audio Gadget"
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#define DRIVER_VERSION "Dec 18, 2008"
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/*-------------------------------------------------------------------------*/
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/*
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* Kbuild is not very cooperative with respect to linking separately
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* compiled library objects into one module. So for now we won't use
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* separate compilation ... ensuring init/exit sections work to shrink
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* the runtime footprint, and giving us at least some parts of what
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* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
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*/
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#include "composite.c"
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#include "usbstring.c"
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#include "config.c"
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#include "epautoconf.c"
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#include "u_audio.c"
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#include "f_audio.c"
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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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.bDeviceClass = USB_CLASS_PER_INTERFACE,
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.bDeviceSubClass = 0,
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.bDeviceProtocol = 0,
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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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/**
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* Handle USB audio endpoint set/get command in setup class request
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*/
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static int audio_set_endpoint_req(struct usb_configuration *c,
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const struct usb_ctrlrequest *ctrl)
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{
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struct usb_composite_dev *cdev = c->cdev;
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int value = -EOPNOTSUPP;
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u16 ep = le16_to_cpu(ctrl->wIndex);
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u16 len = le16_to_cpu(ctrl->wLength);
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u16 w_value = le16_to_cpu(ctrl->wValue);
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DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
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ctrl->bRequest, w_value, len, ep);
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switch (ctrl->bRequest) {
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case UAC_SET_CUR:
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value = 0;
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break;
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case UAC_SET_MIN:
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break;
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case UAC_SET_MAX:
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break;
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case UAC_SET_RES:
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break;
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case UAC_SET_MEM:
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break;
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default:
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break;
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}
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return value;
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}
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static int audio_get_endpoint_req(struct usb_configuration *c,
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const struct usb_ctrlrequest *ctrl)
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{
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struct usb_composite_dev *cdev = c->cdev;
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int value = -EOPNOTSUPP;
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u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
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u16 len = le16_to_cpu(ctrl->wLength);
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u16 w_value = le16_to_cpu(ctrl->wValue);
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DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
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ctrl->bRequest, w_value, len, ep);
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switch (ctrl->bRequest) {
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case UAC_GET_CUR:
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case UAC_GET_MIN:
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case UAC_GET_MAX:
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case UAC_GET_RES:
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value = 3;
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break;
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case UAC_GET_MEM:
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break;
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default:
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break;
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}
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return value;
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}
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static int
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audio_setup(struct usb_configuration *c, const struct usb_ctrlrequest *ctrl)
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{
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struct usb_composite_dev *cdev = c->cdev;
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struct usb_request *req = cdev->req;
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int value = -EOPNOTSUPP;
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u16 w_index = le16_to_cpu(ctrl->wIndex);
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u16 w_value = le16_to_cpu(ctrl->wValue);
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u16 w_length = le16_to_cpu(ctrl->wLength);
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/* composite driver infrastructure handles everything except
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* Audio class messages; interface activation uses set_alt().
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*/
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switch (ctrl->bRequestType) {
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case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
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value = audio_set_endpoint_req(c, ctrl);
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break;
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case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
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value = audio_get_endpoint_req(c, ctrl);
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break;
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default:
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ERROR(cdev, "Invalid control req%02x.%02x v%04x i%04x l%d\n",
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ctrl->bRequestType, ctrl->bRequest,
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w_value, w_index, w_length);
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}
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/* respond with data transfer or status phase? */
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if (value >= 0) {
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DBG(cdev, "Audio req%02x.%02x v%04x i%04x l%d\n",
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ctrl->bRequestType, ctrl->bRequest,
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w_value, w_index, w_length);
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req->zero = 0;
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req->length = value;
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value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
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if (value < 0)
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ERROR(cdev, "Audio response on err %d\n", value);
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}
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/* device either stalls (value < 0) or reports success */
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return value;
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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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.bind = audio_do_config,
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.setup = audio_setup,
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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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};
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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 gcnum;
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int status;
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gcnum = usb_gadget_controller_number(cdev->gadget);
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if (gcnum >= 0)
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device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
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else {
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ERROR(cdev, "controller '%s' not recognized; trying %s\n",
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cdev->gadget->name,
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audio_config_driver.label);
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device_desc.bcdDevice =
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__constant_cpu_to_le16(0x0300 | 0x0099);
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}
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/* device descriptor strings: manufacturer, product */
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snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
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init_utsname()->sysname, init_utsname()->release,
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cdev->gadget->name);
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status = usb_string_id(cdev);
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if (status < 0)
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goto fail;
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strings_dev[STRING_MANUFACTURER_IDX].id = status;
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device_desc.iManufacturer = status;
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status = usb_string_id(cdev);
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if (status < 0)
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goto fail;
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strings_dev[STRING_PRODUCT_IDX].id = status;
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device_desc.iProduct = status;
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status = usb_add_config(cdev, &audio_config_driver);
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if (status < 0)
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goto fail;
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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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return 0;
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}
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static 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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.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_register(&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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