1 files changed, 661 insertions, 0 deletions

diff --git a/drivers/usb/gadget/f_uvc.c b/drivers/usb/gadget/f_uvc.c
new file mode 100644
index 000000000000..fc2611f8b326
--- /dev/null
+++ b/drivers/usb/gadget/f_uvc.c
@@ -0,0 +1,661 @@
+/*
+ *      uvc_gadget.c  --  USB Video Class Gadget driver
+ *
+ *      Copyright (C) 2009-2010
+ *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/video.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+
+#include <media/v4l2-dev.h>
+#include <media/v4l2-event.h>
+
+#include "uvc.h"
+
+unsigned int uvc_trace_param;
+
+/* --------------------------------------------------------------------------
+ * Function descriptors
+ */
+
+/* string IDs are assigned dynamically */
+
+#define UVC_STRING_ASSOCIATION_IDX              0
+#define UVC_STRING_CONTROL_IDX                  1
+#define UVC_STRING_STREAMING_IDX                2
+
+static struct usb_string uvc_en_us_strings[] = {
+        [UVC_STRING_ASSOCIATION_IDX].s = "UVC Camera",
+        [UVC_STRING_CONTROL_IDX].s = "Video Control",
+        [UVC_STRING_STREAMING_IDX].s = "Video Streaming",
+        {  }
+};
+
+static struct usb_gadget_strings uvc_stringtab = {
+        .language = 0x0409,     /* en-us */
+        .strings = uvc_en_us_strings,
+};
+
+static struct usb_gadget_strings *uvc_function_strings[] = {
+        &uvc_stringtab,
+        NULL,
+};
+
+#define UVC_INTF_VIDEO_CONTROL                  0
+#define UVC_INTF_VIDEO_STREAMING                1
+
+static struct usb_interface_assoc_descriptor uvc_iad __initdata = {
+        .bLength                = USB_DT_INTERFACE_ASSOCIATION_SIZE,
+        .bDescriptorType        = USB_DT_INTERFACE_ASSOCIATION,
+        .bFirstInterface        = 0,
+        .bInterfaceCount        = 2,
+        .bFunctionClass         = USB_CLASS_VIDEO,
+        .bFunctionSubClass      = 0x03,
+        .bFunctionProtocol      = 0x00,
+        .iFunction              = 0,
+};
+
+static struct usb_interface_descriptor uvc_control_intf __initdata = {
+        .bLength                = USB_DT_INTERFACE_SIZE,
+        .bDescriptorType        = USB_DT_INTERFACE,
+        .bInterfaceNumber       = UVC_INTF_VIDEO_CONTROL,
+        .bAlternateSetting      = 0,
+        .bNumEndpoints          = 1,
+        .bInterfaceClass        = USB_CLASS_VIDEO,
+        .bInterfaceSubClass     = 0x01,
+        .bInterfaceProtocol     = 0x00,
+        .iInterface             = 0,
+};
+
+static struct usb_endpoint_descriptor uvc_control_ep __initdata = {
+        .bLength                = USB_DT_ENDPOINT_SIZE,
+        .bDescriptorType        = USB_DT_ENDPOINT,
+        .bEndpointAddress       = USB_DIR_IN,
+        .bmAttributes           = USB_ENDPOINT_XFER_INT,
+        .wMaxPacketSize         = cpu_to_le16(16),
+        .bInterval              = 8,
+};
+
+static struct uvc_control_endpoint_descriptor uvc_control_cs_ep __initdata = {
+        .bLength                = UVC_DT_CONTROL_ENDPOINT_SIZE,
+        .bDescriptorType        = USB_DT_CS_ENDPOINT,
+        .bDescriptorSubType     = UVC_EP_INTERRUPT,
+        .wMaxTransferSize       = cpu_to_le16(16),
+};
+
+static struct usb_interface_descriptor uvc_streaming_intf_alt0 __initdata = {
+        .bLength                = USB_DT_INTERFACE_SIZE,
+        .bDescriptorType        = USB_DT_INTERFACE,
+        .bInterfaceNumber       = UVC_INTF_VIDEO_STREAMING,
+        .bAlternateSetting      = 0,
+        .bNumEndpoints          = 0,
+        .bInterfaceClass        = USB_CLASS_VIDEO,
+        .bInterfaceSubClass     = 0x02,
+        .bInterfaceProtocol     = 0x00,
+        .iInterface             = 0,
+};
+
+static struct usb_interface_descriptor uvc_streaming_intf_alt1 __initdata = {
+        .bLength                = USB_DT_INTERFACE_SIZE,
+        .bDescriptorType        = USB_DT_INTERFACE,
+        .bInterfaceNumber       = UVC_INTF_VIDEO_STREAMING,
+        .bAlternateSetting      = 1,
+        .bNumEndpoints          = 1,
+        .bInterfaceClass        = USB_CLASS_VIDEO,
+        .bInterfaceSubClass     = 0x02,
+        .bInterfaceProtocol     = 0x00,
+        .iInterface             = 0,
+};
+
+static struct usb_endpoint_descriptor uvc_streaming_ep = {
+        .bLength                = USB_DT_ENDPOINT_SIZE,
+        .bDescriptorType        = USB_DT_ENDPOINT,
+        .bEndpointAddress       = USB_DIR_IN,
+        .bmAttributes           = USB_ENDPOINT_XFER_ISOC,
+        .wMaxPacketSize         = cpu_to_le16(512),
+        .bInterval              = 1,
+};
+
+static const struct usb_descriptor_header * const uvc_fs_streaming[] = {
+        (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
+        (struct usb_descriptor_header *) &uvc_streaming_ep,
+        NULL,
+};
+
+static const struct usb_descriptor_header * const uvc_hs_streaming[] = {
+        (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
+        (struct usb_descriptor_header *) &uvc_streaming_ep,
+        NULL,
+};
+
+/* --------------------------------------------------------------------------
+ * Control requests
+ */
+
+static void
+uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
+{
+        struct uvc_device *uvc = req->context;
+        struct v4l2_event v4l2_event;
+        struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
+
+        if (uvc->event_setup_out) {
+                uvc->event_setup_out = 0;
+
+                memset(&v4l2_event, 0, sizeof(v4l2_event));
+                v4l2_event.type = UVC_EVENT_DATA;
+                uvc_event->data.length = req->actual;
+                memcpy(&uvc_event->data.data, req->buf, req->actual);
+                v4l2_event_queue(uvc->vdev, &v4l2_event);
+        }
+}
+
+static int
+uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
+{
+        struct uvc_device *uvc = to_uvc(f);
+        struct v4l2_event v4l2_event;
+        struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
+
+        /* printk(KERN_INFO "setup request %02x %02x value %04x index %04x %04x\n",
+         *      ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue),
+         *      le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength));
+         */
+
+        if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
+                INFO(f->config->cdev, "invalid request type\n");
+                return -EINVAL;
+        }
+
+        /* Stall too big requests. */
+        if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE)
+                return -EINVAL;
+
+        memset(&v4l2_event, 0, sizeof(v4l2_event));
+        v4l2_event.type = UVC_EVENT_SETUP;
+        memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
+        v4l2_event_queue(uvc->vdev, &v4l2_event);
+
+        return 0;
+}
+
+static int
+uvc_function_get_alt(struct usb_function *f, unsigned interface)
+{
+        struct uvc_device *uvc = to_uvc(f);
+
+        INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface);
+
+        if (interface == uvc->control_intf)
+                return 0;
+        else if (interface != uvc->streaming_intf)
+                return -EINVAL;
+        else
+                return uvc->state == UVC_STATE_STREAMING ? 1 : 0;
+}
+
+static int
+uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
+{
+        struct uvc_device *uvc = to_uvc(f);
+        struct v4l2_event v4l2_event;
+        struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
+
+        INFO(f->config->cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt);
+
+        if (interface == uvc->control_intf) {
+                if (alt)
+                        return -EINVAL;
+
+                if (uvc->state == UVC_STATE_DISCONNECTED) {
+                        memset(&v4l2_event, 0, sizeof(v4l2_event));
+                        v4l2_event.type = UVC_EVENT_CONNECT;
+                        uvc_event->speed = f->config->cdev->gadget->speed;
+                        v4l2_event_queue(uvc->vdev, &v4l2_event);
+
+                        uvc->state = UVC_STATE_CONNECTED;
+                }
+
+                return 0;
+        }
+
+        if (interface != uvc->streaming_intf)
+                return -EINVAL;
+
+        /* TODO
+        if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep))
+                return alt ? -EINVAL : 0;
+        */
+
+        switch (alt) {
+        case 0:
+                if (uvc->state != UVC_STATE_STREAMING)
+                        return 0;
+
+                if (uvc->video.ep)
+                        usb_ep_disable(uvc->video.ep);
+
+                memset(&v4l2_event, 0, sizeof(v4l2_event));
+                v4l2_event.type = UVC_EVENT_STREAMOFF;
+                v4l2_event_queue(uvc->vdev, &v4l2_event);
+
+                uvc->state = UVC_STATE_CONNECTED;
+                break;
+
+        case 1:
+                if (uvc->state != UVC_STATE_CONNECTED)
+                        return 0;
+
+                if (uvc->video.ep)
+                        usb_ep_enable(uvc->video.ep, &uvc_streaming_ep);
+
+                memset(&v4l2_event, 0, sizeof(v4l2_event));
+                v4l2_event.type = UVC_EVENT_STREAMON;
+                v4l2_event_queue(uvc->vdev, &v4l2_event);
+
+                uvc->state = UVC_STATE_STREAMING;
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static void
+uvc_function_disable(struct usb_function *f)
+{
+        struct uvc_device *uvc = to_uvc(f);
+        struct v4l2_event v4l2_event;
+
+        INFO(f->config->cdev, "uvc_function_disable\n");
+
+        memset(&v4l2_event, 0, sizeof(v4l2_event));
+        v4l2_event.type = UVC_EVENT_DISCONNECT;
+        v4l2_event_queue(uvc->vdev, &v4l2_event);
+
+        uvc->state = UVC_STATE_DISCONNECTED;
+}
+
+/* --------------------------------------------------------------------------
+ * Connection / disconnection
+ */
+
+void
+uvc_function_connect(struct uvc_device *uvc)
+{
+        struct usb_composite_dev *cdev = uvc->func.config->cdev;
+        int ret;
+
+        if ((ret = usb_function_activate(&uvc->func)) < 0)
+                INFO(cdev, "UVC connect failed with %d\n", ret);
+}
+
+void
+uvc_function_disconnect(struct uvc_device *uvc)
+{
+        struct usb_composite_dev *cdev = uvc->func.config->cdev;
+        int ret;
+
+        if ((ret = usb_function_deactivate(&uvc->func)) < 0)
+                INFO(cdev, "UVC disconnect failed with %d\n", ret);
+}
+
+/* --------------------------------------------------------------------------
+ * USB probe and disconnect
+ */
+
+static int
+uvc_register_video(struct uvc_device *uvc)
+{
+        struct usb_composite_dev *cdev = uvc->func.config->cdev;
+        struct video_device *video;
+
+        /* TODO reference counting. */
+        video = video_device_alloc();
+        if (video == NULL)
+                return -ENOMEM;
+
+        video->parent = &cdev->gadget->dev;
+        video->minor = -1;
+        video->fops = &uvc_v4l2_fops;
+        video->release = video_device_release;
+        strncpy(video->name, cdev->gadget->name, sizeof(video->name));
+
+        uvc->vdev = video;
+        video_set_drvdata(video, uvc);
+
+        return video_register_device(video, VFL_TYPE_GRABBER, -1);
+}
+
+#define UVC_COPY_DESCRIPTOR(mem, dst, desc) \
+        do { \
+                memcpy(mem, desc, (desc)->bLength); \
+                *(dst)++ = mem; \
+                mem += (desc)->bLength; \
+        } while (0);
+
+#define UVC_COPY_DESCRIPTORS(mem, dst, src) \
+        do { \
+                const struct usb_descriptor_header * const *__src; \
+                for (__src = src; *__src; ++__src) { \
+                        memcpy(mem, *__src, (*__src)->bLength); \
+                        *dst++ = mem; \
+                        mem += (*__src)->bLength; \
+                } \
+        } while (0)
+
+static struct usb_descriptor_header ** __init
+uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
+{
+        struct uvc_input_header_descriptor *uvc_streaming_header;
+        struct uvc_header_descriptor *uvc_control_header;
+        const struct uvc_descriptor_header * const *uvc_streaming_cls;
+        const struct usb_descriptor_header * const *uvc_streaming_std;
+        const struct usb_descriptor_header * const *src;
+        struct usb_descriptor_header **dst;
+        struct usb_descriptor_header **hdr;
+        unsigned int control_size;
+        unsigned int streaming_size;
+        unsigned int n_desc;
+        unsigned int bytes;
+        void *mem;
+
+        uvc_streaming_cls = (speed == USB_SPEED_FULL)
+                          ? uvc->desc.fs_streaming : uvc->desc.hs_streaming;
+        uvc_streaming_std = (speed == USB_SPEED_FULL)
+                          ? uvc_fs_streaming : uvc_hs_streaming;
+
+        /* Descriptors layout
+         *
+         * uvc_iad
+         * uvc_control_intf
+         * Class-specific UVC control descriptors
+         * uvc_control_ep
+         * uvc_control_cs_ep
+         * uvc_streaming_intf_alt0
+         * Class-specific UVC streaming descriptors
+         * uvc_{fs|hs}_streaming
+         */
+
+        /* Count descriptors and compute their size. */
+        control_size = 0;
+        streaming_size = 0;
+        bytes = uvc_iad.bLength + uvc_control_intf.bLength
+              + uvc_control_ep.bLength + uvc_control_cs_ep.bLength
+              + uvc_streaming_intf_alt0.bLength;
+        n_desc = 5;
+
+        for (src = (const struct usb_descriptor_header**)uvc->desc.control; *src; ++src) {
+                control_size += (*src)->bLength;
+                bytes += (*src)->bLength;
+                n_desc++;
+        }
+        for (src = (const struct usb_descriptor_header**)uvc_streaming_cls; *src; ++src) {
+                streaming_size += (*src)->bLength;
+                bytes += (*src)->bLength;
+                n_desc++;
+        }
+        for (src = uvc_streaming_std; *src; ++src) {
+                bytes += (*src)->bLength;
+                n_desc++;
+        }
+
+        mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL);
+        if (mem == NULL)
+                return NULL;
+
+        hdr = mem;
+        dst = mem;
+        mem += (n_desc + 1) * sizeof(*src);
+
+        /* Copy the descriptors. */
+        UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad);
+        UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf);
+
+        uvc_control_header = mem;
+        UVC_COPY_DESCRIPTORS(mem, dst,
+                (const struct usb_descriptor_header**)uvc->desc.control);
+        uvc_control_header->wTotalLength = cpu_to_le16(control_size);
+        uvc_control_header->bInCollection = 1;
+        uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
+
+        UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep);
+        UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep);
+        UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0);
+
+        uvc_streaming_header = mem;
+        UVC_COPY_DESCRIPTORS(mem, dst,
+                (const struct usb_descriptor_header**)uvc_streaming_cls);
+        uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size);
+        uvc_streaming_header->bEndpointAddress = uvc_streaming_ep.bEndpointAddress;
+
+        UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std);
+
+        *dst = NULL;
+        return hdr;
+}
+
+static void
+uvc_function_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+        struct usb_composite_dev *cdev = c->cdev;
+        struct uvc_device *uvc = to_uvc(f);
+
+        INFO(cdev, "uvc_function_unbind\n");
+
+        if (uvc->vdev) {
+                if (uvc->vdev->minor == -1)
+                        video_device_release(uvc->vdev);
+                else
+                        video_unregister_device(uvc->vdev);
+                uvc->vdev = NULL;
+        }
+
+        if (uvc->control_ep)
+                uvc->control_ep->driver_data = NULL;
+        if (uvc->video.ep)
+                uvc->video.ep->driver_data = NULL;
+
+        if (uvc->control_req) {
+                usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
+                kfree(uvc->control_buf);
+        }
+
+        kfree(f->descriptors);
+        kfree(f->hs_descriptors);
+
+        kfree(uvc);
+}
+
+static int __init
+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_DT_HEADER)
+                goto error;
+
+        if (fs_streaming == NULL || fs_streaming[0] == NULL ||
+            fs_streaming[0]->bDescriptorSubType != UVC_DT_INPUT_HEADER)
+                goto error;
+
+        if (hs_streaming == NULL || hs_streaming[0] == NULL ||
+            hs_streaming[0]->bDescriptorSubType != UVC_DT_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 0;
+
+error:
+        kfree(uvc);
+        return ret;
+}
+
+module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(trace, "Trace level bitmask");
+