diff options
Diffstat (limited to 'drivers/usb/gadget/function/f_uvc.c')
| -rw-r--r-- | drivers/usb/gadget/function/f_uvc.c | 836 |
1 files changed, 836 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c new file mode 100644 index 000000000000..e2a1f50bd93c --- /dev/null +++ b/drivers/usb/gadget/function/f_uvc.c @@ -0,0 +1,836 @@ +/* + * 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/string.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_gadget_trace_param; + +/*-------------------------------------------------------------------------*/ + +/* module parameters specific to the Video streaming endpoint */ +static unsigned int streaming_interval = 1; +module_param(streaming_interval, uint, S_IRUGO|S_IWUSR); +MODULE_PARM_DESC(streaming_interval, "1 - 16"); + +static unsigned int streaming_maxpacket = 1024; +module_param(streaming_maxpacket, uint, S_IRUGO|S_IWUSR); +MODULE_PARM_DESC(streaming_maxpacket, "1 - 1023 (FS), 1 - 3072 (hs/ss)"); + +static unsigned int streaming_maxburst; +module_param(streaming_maxburst, uint, S_IRUGO|S_IWUSR); +MODULE_PARM_DESC(streaming_maxburst, "0 - 15 (ss only)"); + +/* -------------------------------------------------------------------------- + * Function descriptors + */ + +/* string IDs are assigned dynamically */ + +#define UVC_STRING_CONTROL_IDX 0 +#define UVC_STRING_STREAMING_IDX 1 + +static struct usb_string uvc_en_us_strings[] = { + [UVC_STRING_CONTROL_IDX].s = "UVC Camera", + [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 + +#define UVC_STATUS_MAX_PACKET_SIZE 16 /* 16 bytes status */ + +static struct usb_interface_assoc_descriptor uvc_iad __initdata = { + .bLength = sizeof(uvc_iad), + .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, + .bFirstInterface = 0, + .bInterfaceCount = 2, + .bFunctionClass = USB_CLASS_VIDEO, + .bFunctionSubClass = UVC_SC_VIDEO_INTERFACE_COLLECTION, + .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 = UVC_SC_VIDEOCONTROL, + .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(UVC_STATUS_MAX_PACKET_SIZE), + .bInterval = 8, +}; + +static struct usb_ss_ep_comp_descriptor uvc_ss_control_comp __initdata = { + .bLength = sizeof(uvc_ss_control_comp), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + /* The following 3 values can be tweaked if necessary. */ + .bMaxBurst = 0, + .bmAttributes = 0, + .wBytesPerInterval = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE), +}; + +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(UVC_STATUS_MAX_PACKET_SIZE), +}; + +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 = UVC_SC_VIDEOSTREAMING, + .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 = UVC_SC_VIDEOSTREAMING, + .bInterfaceProtocol = 0x00, + .iInterface = 0, +}; + +static struct usb_endpoint_descriptor uvc_fs_streaming_ep __initdata = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_SYNC_ASYNC + | USB_ENDPOINT_XFER_ISOC, + /* The wMaxPacketSize and bInterval values will be initialized from + * module parameters. + */ +}; + +static struct usb_endpoint_descriptor uvc_hs_streaming_ep __initdata = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_SYNC_ASYNC + | USB_ENDPOINT_XFER_ISOC, + /* The wMaxPacketSize and bInterval values will be initialized from + * module parameters. + */ +}; + +static struct usb_endpoint_descriptor uvc_ss_streaming_ep __initdata = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_SYNC_ASYNC + | USB_ENDPOINT_XFER_ISOC, + /* The wMaxPacketSize and bInterval values will be initialized from + * module parameters. + */ +}; + +static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp __initdata = { + .bLength = sizeof(uvc_ss_streaming_comp), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + /* The bMaxBurst, bmAttributes and wBytesPerInterval values will be + * initialized from module parameters. + */ +}; + +static const struct usb_descriptor_header * const uvc_fs_streaming[] = { + (struct usb_descriptor_header *) &uvc_streaming_intf_alt1, + (struct usb_descriptor_header *) &uvc_fs_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_hs_streaming_ep, + NULL, +}; + +static const struct usb_descriptor_header * const uvc_ss_streaming[] = { + (struct usb_descriptor_header *) &uvc_streaming_intf_alt1, + (struct usb_descriptor_header *) &uvc_ss_streaming_ep, + (struct usb_descriptor_header *) &uvc_ss_streaming_comp, + 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; +} + +void uvc_function_setup_continue(struct uvc_device *uvc) +{ + struct usb_composite_dev *cdev = uvc->func.config->cdev; + + usb_composite_setup_continue(cdev); +} + +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; + int ret; + + 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; + return 0; + + case 1: + if (uvc->state != UVC_STATE_CONNECTED) + return 0; + + if (uvc->video.ep) { + ret = config_ep_by_speed(f->config->cdev->gadget, + &(uvc->func), uvc->video.ep); + if (ret) + return ret; + usb_ep_enable(uvc->video.ep); + } + + memset(&v4l2_event, 0, sizeof(v4l2_event)); + v4l2_event.type = UVC_EVENT_STREAMON; + v4l2_event_queue(uvc->vdev, &v4l2_event); + return USB_GADGET_DELAYED_STATUS; + + default: + return -EINVAL; + } +} + +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->v4l2_dev = &uvc->v4l2_dev; + video->fops = &uvc_v4l2_fops; + video->release = video_device_release; + strlcpy(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_control_desc; + 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; + + switch (speed) { + case USB_SPEED_SUPER: + uvc_control_desc = uvc->desc.ss_control; + uvc_streaming_cls = uvc->desc.ss_streaming; + uvc_streaming_std = uvc_ss_streaming; + break; + + case USB_SPEED_HIGH: + uvc_control_desc = uvc->desc.fs_control; + uvc_streaming_cls = uvc->desc.hs_streaming; + uvc_streaming_std = uvc_hs_streaming; + break; + + case USB_SPEED_FULL: + default: + uvc_control_desc = uvc->desc.fs_control; + uvc_streaming_cls = uvc->desc.fs_streaming; + uvc_streaming_std = uvc_fs_streaming; + break; + } + + /* Descriptors layout + * + * uvc_iad + * uvc_control_intf + * Class-specific UVC control descriptors + * uvc_control_ep + * uvc_control_cs_ep + * uvc_ss_control_comp (for SS only) + * 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; + + if (speed == USB_SPEED_SUPER) { + bytes += uvc_ss_control_comp.bLength; + n_desc = 6; + } else { + n_desc = 5; + } + + for (src = (const struct usb_descriptor_header **)uvc_control_desc; + *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_control_desc); + 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); + if (speed == USB_SPEED_SUPER) + UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp); + + 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->video.ep->address; + + 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"); + + video_unregister_device(uvc->vdev); + v4l2_device_unregister(&uvc->v4l2_dev); + uvc->control_ep->driver_data = NULL; + uvc->video.ep->driver_data = NULL; + + uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id = 0; + usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); + kfree(uvc->control_buf); + + usb_free_all_descriptors(f); + + 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); + unsigned int max_packet_mult; + unsigned int max_packet_size; + struct usb_ep *ep; + int ret = -EINVAL; + + INFO(cdev, "uvc_function_bind\n"); + + /* Sanity check the streaming endpoint module parameters. + */ + streaming_interval = clamp(streaming_interval, 1U, 16U); + streaming_maxpacket = clamp(streaming_maxpacket, 1U, 3072U); + streaming_maxburst = min(streaming_maxburst, 15U); + + /* Fill in the FS/HS/SS Video Streaming specific descriptors from the + * module parameters. + * + * NOTE: We assume that the user knows what they are doing and won't + * give parameters that their UDC doesn't support. + */ + if (streaming_maxpacket <= 1024) { + max_packet_mult = 1; + max_packet_size = streaming_maxpacket; + } else if (streaming_maxpacket <= 2048) { + max_packet_mult = 2; + max_packet_size = streaming_maxpacket / 2; + } else { + max_packet_mult = 3; + max_packet_size = streaming_maxpacket / 3; + } + + uvc_fs_streaming_ep.wMaxPacketSize = min(streaming_maxpacket, 1023U); + uvc_fs_streaming_ep.bInterval = streaming_interval; + + uvc_hs_streaming_ep.wMaxPacketSize = max_packet_size; + uvc_hs_streaming_ep.wMaxPacketSize |= ((max_packet_mult - 1) << 11); + uvc_hs_streaming_ep.bInterval = streaming_interval; + + uvc_ss_streaming_ep.wMaxPacketSize = max_packet_size; + uvc_ss_streaming_ep.bInterval = streaming_interval; + uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1; + uvc_ss_streaming_comp.bMaxBurst = streaming_maxburst; + uvc_ss_streaming_comp.wBytesPerInterval = + max_packet_size * max_packet_mult * streaming_maxburst; + + /* 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; + + if (gadget_is_superspeed(c->cdev->gadget)) + ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep, + &uvc_ss_streaming_comp); + else if (gadget_is_dualspeed(cdev->gadget)) + ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep); + else + ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep); + + if (!ep) { + INFO(cdev, "Unable to allocate streaming EP\n"); + goto error; + } + uvc->video.ep = ep; + ep->driver_data = uvc; + + uvc_fs_streaming_ep.bEndpointAddress = uvc->video.ep->address; + uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address; + uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address; + + /* 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->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL); + if (gadget_is_dualspeed(cdev->gadget)) + f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH); + if (gadget_is_superspeed(c->cdev->gadget)) + f->ss_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER); + + /* 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; + + if (v4l2_device_register(&cdev->gadget->dev, &uvc->v4l2_dev)) { + printk(KERN_INFO "v4l2_device_register failed\n"); + 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: + v4l2_device_unregister(&uvc->v4l2_dev); + if (uvc->vdev) + video_device_release(uvc->vdev); + + 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); + } + + usb_free_all_descriptors(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 *fs_control, + const struct uvc_descriptor_header * const *ss_control, + const struct uvc_descriptor_header * const *fs_streaming, + const struct uvc_descriptor_header * const *hs_streaming, + const struct uvc_descriptor_header * const *ss_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 (fs_control == NULL || fs_control[0] == NULL || + fs_control[0]->bDescriptorSubType != UVC_VC_HEADER) + goto error; + + if (ss_control == NULL || ss_control[0] == NULL || + ss_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; + + if (ss_streaming == NULL || ss_streaming[0] == NULL || + ss_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER) + goto error; + + uvc->desc.fs_control = fs_control; + uvc->desc.ss_control = ss_control; + uvc->desc.fs_streaming = fs_streaming; + uvc->desc.hs_streaming = hs_streaming; + uvc->desc.ss_streaming = ss_streaming; + + /* String descriptors are global, we only need to allocate string IDs + * for the first UVC function. UVC functions beyond the first (if any) + * will reuse the same IDs. + */ + if (uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id == 0) { + ret = usb_string_ids_tab(c->cdev, uvc_en_us_strings); + if (ret) + goto error; + uvc_iad.iFunction = + uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id; + uvc_control_intf.iInterface = + uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id; + ret = uvc_en_us_strings[UVC_STRING_STREAMING_IDX].id; + 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"); + |