mirror of https://gitee.com/openkylin/linux.git
663 lines
17 KiB
C
663 lines
17 KiB
C
/*
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* uvc_gadget.c -- USB Video Class Gadget driver
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*
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* Copyright (C) 2009-2010
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* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/video.h>
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#include <linux/vmalloc.h>
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#include <linux/wait.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-event.h>
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#include "uvc.h"
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unsigned int uvc_gadget_trace_param;
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/* --------------------------------------------------------------------------
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* Function descriptors
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*/
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/* string IDs are assigned dynamically */
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#define UVC_STRING_ASSOCIATION_IDX 0
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#define UVC_STRING_CONTROL_IDX 1
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#define UVC_STRING_STREAMING_IDX 2
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static struct usb_string uvc_en_us_strings[] = {
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[UVC_STRING_ASSOCIATION_IDX].s = "UVC Camera",
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[UVC_STRING_CONTROL_IDX].s = "Video Control",
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[UVC_STRING_STREAMING_IDX].s = "Video Streaming",
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{ }
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};
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static struct usb_gadget_strings uvc_stringtab = {
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.language = 0x0409, /* en-us */
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.strings = uvc_en_us_strings,
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};
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static struct usb_gadget_strings *uvc_function_strings[] = {
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&uvc_stringtab,
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NULL,
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};
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#define UVC_INTF_VIDEO_CONTROL 0
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#define UVC_INTF_VIDEO_STREAMING 1
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static struct usb_interface_assoc_descriptor uvc_iad __initdata = {
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.bLength = sizeof(uvc_iad),
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.bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
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.bFirstInterface = 0,
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.bInterfaceCount = 2,
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.bFunctionClass = USB_CLASS_VIDEO,
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.bFunctionSubClass = UVC_SC_VIDEO_INTERFACE_COLLECTION,
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.bFunctionProtocol = 0x00,
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.iFunction = 0,
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};
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static struct usb_interface_descriptor uvc_control_intf __initdata = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = UVC_INTF_VIDEO_CONTROL,
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.bAlternateSetting = 0,
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.bNumEndpoints = 1,
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.bInterfaceClass = USB_CLASS_VIDEO,
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.bInterfaceSubClass = UVC_SC_VIDEOCONTROL,
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.bInterfaceProtocol = 0x00,
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.iInterface = 0,
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};
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static struct usb_endpoint_descriptor uvc_control_ep __initdata = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_INT,
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.wMaxPacketSize = cpu_to_le16(16),
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.bInterval = 8,
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};
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static struct uvc_control_endpoint_descriptor uvc_control_cs_ep __initdata = {
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.bLength = UVC_DT_CONTROL_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_CS_ENDPOINT,
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.bDescriptorSubType = UVC_EP_INTERRUPT,
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.wMaxTransferSize = cpu_to_le16(16),
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};
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static struct usb_interface_descriptor uvc_streaming_intf_alt0 __initdata = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
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.bAlternateSetting = 0,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_VIDEO,
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.bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
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.bInterfaceProtocol = 0x00,
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.iInterface = 0,
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};
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static struct usb_interface_descriptor uvc_streaming_intf_alt1 __initdata = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
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.bAlternateSetting = 1,
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.bNumEndpoints = 1,
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.bInterfaceClass = USB_CLASS_VIDEO,
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.bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
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.bInterfaceProtocol = 0x00,
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.iInterface = 0,
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};
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static struct usb_endpoint_descriptor uvc_streaming_ep = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_ISOC,
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.wMaxPacketSize = cpu_to_le16(512),
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.bInterval = 1,
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};
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static const struct usb_descriptor_header * const uvc_fs_streaming[] = {
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(struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
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(struct usb_descriptor_header *) &uvc_streaming_ep,
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NULL,
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};
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static const struct usb_descriptor_header * const uvc_hs_streaming[] = {
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(struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
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(struct usb_descriptor_header *) &uvc_streaming_ep,
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NULL,
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};
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/* --------------------------------------------------------------------------
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* Control requests
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*/
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static void
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uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct uvc_device *uvc = req->context;
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struct v4l2_event v4l2_event;
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struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
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if (uvc->event_setup_out) {
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uvc->event_setup_out = 0;
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_DATA;
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uvc_event->data.length = req->actual;
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memcpy(&uvc_event->data.data, req->buf, req->actual);
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v4l2_event_queue(uvc->vdev, &v4l2_event);
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}
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}
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static int
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uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
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{
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struct uvc_device *uvc = to_uvc(f);
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struct v4l2_event v4l2_event;
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struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
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/* printk(KERN_INFO "setup request %02x %02x value %04x index %04x %04x\n",
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* ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue),
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* le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength));
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*/
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if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
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INFO(f->config->cdev, "invalid request type\n");
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return -EINVAL;
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}
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/* Stall too big requests. */
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if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE)
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return -EINVAL;
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_SETUP;
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memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
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v4l2_event_queue(uvc->vdev, &v4l2_event);
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return 0;
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}
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static int
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uvc_function_get_alt(struct usb_function *f, unsigned interface)
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{
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struct uvc_device *uvc = to_uvc(f);
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INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface);
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if (interface == uvc->control_intf)
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return 0;
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else if (interface != uvc->streaming_intf)
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return -EINVAL;
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else
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return uvc->state == UVC_STATE_STREAMING ? 1 : 0;
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}
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static int
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uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
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{
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struct uvc_device *uvc = to_uvc(f);
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struct v4l2_event v4l2_event;
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struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
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INFO(f->config->cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt);
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if (interface == uvc->control_intf) {
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if (alt)
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return -EINVAL;
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if (uvc->state == UVC_STATE_DISCONNECTED) {
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_CONNECT;
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uvc_event->speed = f->config->cdev->gadget->speed;
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v4l2_event_queue(uvc->vdev, &v4l2_event);
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uvc->state = UVC_STATE_CONNECTED;
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}
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return 0;
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}
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if (interface != uvc->streaming_intf)
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return -EINVAL;
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/* TODO
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if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep))
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return alt ? -EINVAL : 0;
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*/
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switch (alt) {
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case 0:
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if (uvc->state != UVC_STATE_STREAMING)
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return 0;
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if (uvc->video.ep)
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usb_ep_disable(uvc->video.ep);
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_STREAMOFF;
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v4l2_event_queue(uvc->vdev, &v4l2_event);
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uvc->state = UVC_STATE_CONNECTED;
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break;
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case 1:
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if (uvc->state != UVC_STATE_CONNECTED)
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return 0;
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if (uvc->video.ep) {
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uvc->video.ep->desc = &uvc_streaming_ep;
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usb_ep_enable(uvc->video.ep);
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}
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_STREAMON;
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v4l2_event_queue(uvc->vdev, &v4l2_event);
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uvc->state = UVC_STATE_STREAMING;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static void
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uvc_function_disable(struct usb_function *f)
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{
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struct uvc_device *uvc = to_uvc(f);
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struct v4l2_event v4l2_event;
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INFO(f->config->cdev, "uvc_function_disable\n");
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_DISCONNECT;
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v4l2_event_queue(uvc->vdev, &v4l2_event);
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uvc->state = UVC_STATE_DISCONNECTED;
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}
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/* --------------------------------------------------------------------------
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* Connection / disconnection
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*/
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void
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uvc_function_connect(struct uvc_device *uvc)
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{
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struct usb_composite_dev *cdev = uvc->func.config->cdev;
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int ret;
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if ((ret = usb_function_activate(&uvc->func)) < 0)
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INFO(cdev, "UVC connect failed with %d\n", ret);
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}
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void
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uvc_function_disconnect(struct uvc_device *uvc)
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{
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struct usb_composite_dev *cdev = uvc->func.config->cdev;
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int ret;
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if ((ret = usb_function_deactivate(&uvc->func)) < 0)
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INFO(cdev, "UVC disconnect failed with %d\n", ret);
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}
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/* --------------------------------------------------------------------------
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* USB probe and disconnect
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*/
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static int
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uvc_register_video(struct uvc_device *uvc)
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{
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struct usb_composite_dev *cdev = uvc->func.config->cdev;
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struct video_device *video;
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/* TODO reference counting. */
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video = video_device_alloc();
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if (video == NULL)
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return -ENOMEM;
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video->parent = &cdev->gadget->dev;
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video->minor = -1;
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video->fops = &uvc_v4l2_fops;
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video->release = video_device_release;
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strncpy(video->name, cdev->gadget->name, sizeof(video->name));
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uvc->vdev = video;
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video_set_drvdata(video, uvc);
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return video_register_device(video, VFL_TYPE_GRABBER, -1);
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}
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#define UVC_COPY_DESCRIPTOR(mem, dst, desc) \
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do { \
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memcpy(mem, desc, (desc)->bLength); \
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*(dst)++ = mem; \
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mem += (desc)->bLength; \
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} while (0);
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#define UVC_COPY_DESCRIPTORS(mem, dst, src) \
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do { \
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const struct usb_descriptor_header * const *__src; \
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for (__src = src; *__src; ++__src) { \
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memcpy(mem, *__src, (*__src)->bLength); \
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*dst++ = mem; \
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mem += (*__src)->bLength; \
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} \
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} while (0)
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static struct usb_descriptor_header ** __init
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uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
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{
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struct uvc_input_header_descriptor *uvc_streaming_header;
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struct uvc_header_descriptor *uvc_control_header;
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const struct uvc_descriptor_header * const *uvc_streaming_cls;
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const struct usb_descriptor_header * const *uvc_streaming_std;
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const struct usb_descriptor_header * const *src;
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struct usb_descriptor_header **dst;
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struct usb_descriptor_header **hdr;
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unsigned int control_size;
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unsigned int streaming_size;
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unsigned int n_desc;
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unsigned int bytes;
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void *mem;
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uvc_streaming_cls = (speed == USB_SPEED_FULL)
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? uvc->desc.fs_streaming : uvc->desc.hs_streaming;
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uvc_streaming_std = (speed == USB_SPEED_FULL)
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? uvc_fs_streaming : uvc_hs_streaming;
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/* Descriptors layout
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*
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* uvc_iad
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* uvc_control_intf
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* Class-specific UVC control descriptors
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* uvc_control_ep
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* uvc_control_cs_ep
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* uvc_streaming_intf_alt0
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* Class-specific UVC streaming descriptors
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* uvc_{fs|hs}_streaming
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*/
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/* Count descriptors and compute their size. */
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control_size = 0;
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streaming_size = 0;
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bytes = uvc_iad.bLength + uvc_control_intf.bLength
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+ uvc_control_ep.bLength + uvc_control_cs_ep.bLength
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+ uvc_streaming_intf_alt0.bLength;
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n_desc = 5;
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for (src = (const struct usb_descriptor_header**)uvc->desc.control; *src; ++src) {
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control_size += (*src)->bLength;
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bytes += (*src)->bLength;
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n_desc++;
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}
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for (src = (const struct usb_descriptor_header**)uvc_streaming_cls; *src; ++src) {
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streaming_size += (*src)->bLength;
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bytes += (*src)->bLength;
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n_desc++;
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}
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for (src = uvc_streaming_std; *src; ++src) {
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bytes += (*src)->bLength;
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n_desc++;
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}
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mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL);
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if (mem == NULL)
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return NULL;
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hdr = mem;
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dst = mem;
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mem += (n_desc + 1) * sizeof(*src);
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/* Copy the descriptors. */
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UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad);
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UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf);
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uvc_control_header = mem;
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UVC_COPY_DESCRIPTORS(mem, dst,
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(const struct usb_descriptor_header**)uvc->desc.control);
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uvc_control_header->wTotalLength = cpu_to_le16(control_size);
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uvc_control_header->bInCollection = 1;
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uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
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UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep);
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UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep);
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UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0);
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uvc_streaming_header = mem;
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UVC_COPY_DESCRIPTORS(mem, dst,
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(const struct usb_descriptor_header**)uvc_streaming_cls);
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uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size);
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uvc_streaming_header->bEndpointAddress = uvc_streaming_ep.bEndpointAddress;
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UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std);
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*dst = NULL;
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return hdr;
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}
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static void
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uvc_function_unbind(struct usb_configuration *c, struct usb_function *f)
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{
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struct usb_composite_dev *cdev = c->cdev;
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struct uvc_device *uvc = to_uvc(f);
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INFO(cdev, "uvc_function_unbind\n");
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if (uvc->vdev) {
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if (uvc->vdev->minor == -1)
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video_device_release(uvc->vdev);
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else
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video_unregister_device(uvc->vdev);
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uvc->vdev = NULL;
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}
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if (uvc->control_ep)
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uvc->control_ep->driver_data = NULL;
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if (uvc->video.ep)
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uvc->video.ep->driver_data = NULL;
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if (uvc->control_req) {
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usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
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kfree(uvc->control_buf);
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}
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kfree(f->descriptors);
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kfree(f->hs_descriptors);
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kfree(uvc);
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}
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static int __init
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uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
|
|
{
|
|
struct usb_composite_dev *cdev = c->cdev;
|
|
struct uvc_device *uvc = to_uvc(f);
|
|
struct usb_ep *ep;
|
|
int ret = -EINVAL;
|
|
|
|
INFO(cdev, "uvc_function_bind\n");
|
|
|
|
/* Allocate endpoints. */
|
|
ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
|
|
if (!ep) {
|
|
INFO(cdev, "Unable to allocate control EP\n");
|
|
goto error;
|
|
}
|
|
uvc->control_ep = ep;
|
|
ep->driver_data = uvc;
|
|
|
|
ep = usb_ep_autoconfig(cdev->gadget, &uvc_streaming_ep);
|
|
if (!ep) {
|
|
INFO(cdev, "Unable to allocate streaming EP\n");
|
|
goto error;
|
|
}
|
|
uvc->video.ep = ep;
|
|
ep->driver_data = uvc;
|
|
|
|
/* Allocate interface IDs. */
|
|
if ((ret = usb_interface_id(c, f)) < 0)
|
|
goto error;
|
|
uvc_iad.bFirstInterface = ret;
|
|
uvc_control_intf.bInterfaceNumber = ret;
|
|
uvc->control_intf = ret;
|
|
|
|
if ((ret = usb_interface_id(c, f)) < 0)
|
|
goto error;
|
|
uvc_streaming_intf_alt0.bInterfaceNumber = ret;
|
|
uvc_streaming_intf_alt1.bInterfaceNumber = ret;
|
|
uvc->streaming_intf = ret;
|
|
|
|
/* Copy descriptors. */
|
|
f->descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL);
|
|
f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH);
|
|
|
|
/* Preallocate control endpoint request. */
|
|
uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL);
|
|
uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL);
|
|
if (uvc->control_req == NULL || uvc->control_buf == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
uvc->control_req->buf = uvc->control_buf;
|
|
uvc->control_req->complete = uvc_function_ep0_complete;
|
|
uvc->control_req->context = uvc;
|
|
|
|
/* Avoid letting this gadget enumerate until the userspace server is
|
|
* active.
|
|
*/
|
|
if ((ret = usb_function_deactivate(f)) < 0)
|
|
goto error;
|
|
|
|
/* Initialise video. */
|
|
ret = uvc_video_init(&uvc->video);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
/* Register a V4L2 device. */
|
|
ret = uvc_register_video(uvc);
|
|
if (ret < 0) {
|
|
printk(KERN_INFO "Unable to register video device\n");
|
|
goto error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
uvc_function_unbind(c, f);
|
|
return ret;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
* USB gadget function
|
|
*/
|
|
|
|
/**
|
|
* uvc_bind_config - add a UVC function to a configuration
|
|
* @c: the configuration to support the UVC instance
|
|
* Context: single threaded during gadget setup
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*
|
|
* Caller must have called @uvc_setup(). Caller is also responsible for
|
|
* calling @uvc_cleanup() before module unload.
|
|
*/
|
|
int __init
|
|
uvc_bind_config(struct usb_configuration *c,
|
|
const struct uvc_descriptor_header * const *control,
|
|
const struct uvc_descriptor_header * const *fs_streaming,
|
|
const struct uvc_descriptor_header * const *hs_streaming)
|
|
{
|
|
struct uvc_device *uvc;
|
|
int ret = 0;
|
|
|
|
/* TODO Check if the USB device controller supports the required
|
|
* features.
|
|
*/
|
|
if (!gadget_is_dualspeed(c->cdev->gadget))
|
|
return -EINVAL;
|
|
|
|
uvc = kzalloc(sizeof(*uvc), GFP_KERNEL);
|
|
if (uvc == NULL)
|
|
return -ENOMEM;
|
|
|
|
uvc->state = UVC_STATE_DISCONNECTED;
|
|
|
|
/* Validate the descriptors. */
|
|
if (control == NULL || control[0] == NULL ||
|
|
control[0]->bDescriptorSubType != UVC_VC_HEADER)
|
|
goto error;
|
|
|
|
if (fs_streaming == NULL || fs_streaming[0] == NULL ||
|
|
fs_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER)
|
|
goto error;
|
|
|
|
if (hs_streaming == NULL || hs_streaming[0] == NULL ||
|
|
hs_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER)
|
|
goto error;
|
|
|
|
uvc->desc.control = control;
|
|
uvc->desc.fs_streaming = fs_streaming;
|
|
uvc->desc.hs_streaming = hs_streaming;
|
|
|
|
/* Allocate string descriptor numbers. */
|
|
if ((ret = usb_string_id(c->cdev)) < 0)
|
|
goto error;
|
|
uvc_en_us_strings[UVC_STRING_ASSOCIATION_IDX].id = ret;
|
|
uvc_iad.iFunction = ret;
|
|
|
|
if ((ret = usb_string_id(c->cdev)) < 0)
|
|
goto error;
|
|
uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id = ret;
|
|
uvc_control_intf.iInterface = ret;
|
|
|
|
if ((ret = usb_string_id(c->cdev)) < 0)
|
|
goto error;
|
|
uvc_en_us_strings[UVC_STRING_STREAMING_IDX].id = ret;
|
|
uvc_streaming_intf_alt0.iInterface = ret;
|
|
uvc_streaming_intf_alt1.iInterface = ret;
|
|
|
|
/* Register the function. */
|
|
uvc->func.name = "uvc";
|
|
uvc->func.strings = uvc_function_strings;
|
|
uvc->func.bind = uvc_function_bind;
|
|
uvc->func.unbind = uvc_function_unbind;
|
|
uvc->func.get_alt = uvc_function_get_alt;
|
|
uvc->func.set_alt = uvc_function_set_alt;
|
|
uvc->func.disable = uvc_function_disable;
|
|
uvc->func.setup = uvc_function_setup;
|
|
|
|
ret = usb_add_function(c, &uvc->func);
|
|
if (ret)
|
|
kfree(uvc);
|
|
|
|
return ret;
|
|
|
|
error:
|
|
kfree(uvc);
|
|
return ret;
|
|
}
|
|
|
|
module_param_named(trace, uvc_gadget_trace_param, uint, S_IRUGO|S_IWUSR);
|
|
MODULE_PARM_DESC(trace, "Trace level bitmask");
|
|
|