diff options
Diffstat (limited to 'drivers/media/usb/uvc/uvc_v4l2.c')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_v4l2.c | 1383 |
1 files changed, 1383 insertions, 0 deletions
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c new file mode 100644 index 00000000000..378ae02e593 --- /dev/null +++ b/drivers/media/usb/uvc/uvc_v4l2.c @@ -0,0 +1,1383 @@ +/* + * uvc_v4l2.c -- USB Video Class driver - V4L2 API + * + * Copyright (C) 2005-2010 + * 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/compat.h> +#include <linux/kernel.h> +#include <linux/version.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/usb.h> +#include <linux/videodev2.h> +#include <linux/vmalloc.h> +#include <linux/mm.h> +#include <linux/wait.h> +#include <linux/atomic.h> + +#include <media/v4l2-common.h> +#include <media/v4l2-ctrls.h> +#include <media/v4l2-event.h> +#include <media/v4l2-ioctl.h> + +#include "uvcvideo.h" + +/* ------------------------------------------------------------------------ + * UVC ioctls + */ +static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain, + struct uvc_xu_control_mapping *xmap) +{ + struct uvc_control_mapping *map; + unsigned int size; + int ret; + + map = kzalloc(sizeof *map, GFP_KERNEL); + if (map == NULL) + return -ENOMEM; + + map->id = xmap->id; + memcpy(map->name, xmap->name, sizeof map->name); + memcpy(map->entity, xmap->entity, sizeof map->entity); + map->selector = xmap->selector; + map->size = xmap->size; + map->offset = xmap->offset; + map->v4l2_type = xmap->v4l2_type; + map->data_type = xmap->data_type; + + switch (xmap->v4l2_type) { + case V4L2_CTRL_TYPE_INTEGER: + case V4L2_CTRL_TYPE_BOOLEAN: + case V4L2_CTRL_TYPE_BUTTON: + break; + + case V4L2_CTRL_TYPE_MENU: + /* Prevent excessive memory consumption, as well as integer + * overflows. + */ + if (xmap->menu_count == 0 || + xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) { + ret = -EINVAL; + goto done; + } + + size = xmap->menu_count * sizeof(*map->menu_info); + map->menu_info = kmalloc(size, GFP_KERNEL); + if (map->menu_info == NULL) { + ret = -ENOMEM; + goto done; + } + + if (copy_from_user(map->menu_info, xmap->menu_info, size)) { + ret = -EFAULT; + goto done; + } + + map->menu_count = xmap->menu_count; + break; + + default: + uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type " + "%u.\n", xmap->v4l2_type); + ret = -ENOTTY; + goto done; + } + + ret = uvc_ctrl_add_mapping(chain, map); + +done: + kfree(map->menu_info); + kfree(map); + + return ret; +} + +/* ------------------------------------------------------------------------ + * V4L2 interface + */ + +/* + * Find the frame interval closest to the requested frame interval for the + * given frame format and size. This should be done by the device as part of + * the Video Probe and Commit negotiation, but some hardware don't implement + * that feature. + */ +static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval) +{ + unsigned int i; + + if (frame->bFrameIntervalType) { + __u32 best = -1, dist; + + for (i = 0; i < frame->bFrameIntervalType; ++i) { + dist = interval > frame->dwFrameInterval[i] + ? interval - frame->dwFrameInterval[i] + : frame->dwFrameInterval[i] - interval; + + if (dist > best) + break; + + best = dist; + } + + interval = frame->dwFrameInterval[i-1]; + } else { + const __u32 min = frame->dwFrameInterval[0]; + const __u32 max = frame->dwFrameInterval[1]; + const __u32 step = frame->dwFrameInterval[2]; + + interval = min + (interval - min + step/2) / step * step; + if (interval > max) + interval = max; + } + + return interval; +} + +static int uvc_v4l2_try_format(struct uvc_streaming *stream, + struct v4l2_format *fmt, struct uvc_streaming_control *probe, + struct uvc_format **uvc_format, struct uvc_frame **uvc_frame) +{ + struct uvc_format *format = NULL; + struct uvc_frame *frame = NULL; + __u16 rw, rh; + unsigned int d, maxd; + unsigned int i; + __u32 interval; + int ret = 0; + __u8 *fcc; + + if (fmt->type != stream->type) + return -EINVAL; + + fcc = (__u8 *)&fmt->fmt.pix.pixelformat; + uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n", + fmt->fmt.pix.pixelformat, + fcc[0], fcc[1], fcc[2], fcc[3], + fmt->fmt.pix.width, fmt->fmt.pix.height); + + /* Check if the hardware supports the requested format, use the default + * format otherwise. + */ + for (i = 0; i < stream->nformats; ++i) { + format = &stream->format[i]; + if (format->fcc == fmt->fmt.pix.pixelformat) + break; + } + + if (i == stream->nformats) { + format = stream->def_format; + fmt->fmt.pix.pixelformat = format->fcc; + } + + /* Find the closest image size. The distance between image sizes is + * the size in pixels of the non-overlapping regions between the + * requested size and the frame-specified size. + */ + rw = fmt->fmt.pix.width; + rh = fmt->fmt.pix.height; + maxd = (unsigned int)-1; + + for (i = 0; i < format->nframes; ++i) { + __u16 w = format->frame[i].wWidth; + __u16 h = format->frame[i].wHeight; + + d = min(w, rw) * min(h, rh); + d = w*h + rw*rh - 2*d; + if (d < maxd) { + maxd = d; + frame = &format->frame[i]; + } + + if (maxd == 0) + break; + } + + if (frame == NULL) { + uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n", + fmt->fmt.pix.width, fmt->fmt.pix.height); + return -EINVAL; + } + + /* Use the default frame interval. */ + interval = frame->dwDefaultFrameInterval; + uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us " + "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval, + (100000000/interval)%10); + + /* Set the format index, frame index and frame interval. */ + memset(probe, 0, sizeof *probe); + probe->bmHint = 1; /* dwFrameInterval */ + probe->bFormatIndex = format->index; + probe->bFrameIndex = frame->bFrameIndex; + probe->dwFrameInterval = uvc_try_frame_interval(frame, interval); + /* Some webcams stall the probe control set request when the + * dwMaxVideoFrameSize field is set to zero. The UVC specification + * clearly states that the field is read-only from the host, so this + * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by + * the webcam to work around the problem. + * + * The workaround could probably be enabled for all webcams, so the + * quirk can be removed if needed. It's currently useful to detect + * webcam bugs and fix them before they hit the market (providing + * developers test their webcams with the Linux driver as well as with + * the Windows driver). + */ + mutex_lock(&stream->mutex); + if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS) + probe->dwMaxVideoFrameSize = + stream->ctrl.dwMaxVideoFrameSize; + + /* Probe the device. */ + ret = uvc_probe_video(stream, probe); + mutex_unlock(&stream->mutex); + if (ret < 0) + goto done; + + fmt->fmt.pix.width = frame->wWidth; + fmt->fmt.pix.height = frame->wHeight; + fmt->fmt.pix.field = V4L2_FIELD_NONE; + fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8; + fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize; + fmt->fmt.pix.colorspace = format->colorspace; + fmt->fmt.pix.priv = 0; + + if (uvc_format != NULL) + *uvc_format = format; + if (uvc_frame != NULL) + *uvc_frame = frame; + +done: + return ret; +} + +static int uvc_v4l2_get_format(struct uvc_streaming *stream, + struct v4l2_format *fmt) +{ + struct uvc_format *format; + struct uvc_frame *frame; + int ret = 0; + + if (fmt->type != stream->type) + return -EINVAL; + + mutex_lock(&stream->mutex); + format = stream->cur_format; + frame = stream->cur_frame; + + if (format == NULL || frame == NULL) { + ret = -EINVAL; + goto done; + } + + fmt->fmt.pix.pixelformat = format->fcc; + fmt->fmt.pix.width = frame->wWidth; + fmt->fmt.pix.height = frame->wHeight; + fmt->fmt.pix.field = V4L2_FIELD_NONE; + fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8; + fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize; + fmt->fmt.pix.colorspace = format->colorspace; + fmt->fmt.pix.priv = 0; + +done: + mutex_unlock(&stream->mutex); + return ret; +} + +static int uvc_v4l2_set_format(struct uvc_streaming *stream, + struct v4l2_format *fmt) +{ + struct uvc_streaming_control probe; + struct uvc_format *format; + struct uvc_frame *frame; + int ret; + + if (fmt->type != stream->type) + return -EINVAL; + + ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame); + if (ret < 0) + return ret; + + mutex_lock(&stream->mutex); + + if (uvc_queue_allocated(&stream->queue)) { + ret = -EBUSY; + goto done; + } + + stream->ctrl = probe; + stream->cur_format = format; + stream->cur_frame = frame; + +done: + mutex_unlock(&stream->mutex); + return ret; +} + +static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream, + struct v4l2_streamparm *parm) +{ + uint32_t numerator, denominator; + + if (parm->type != stream->type) + return -EINVAL; + + mutex_lock(&stream->mutex); + numerator = stream->ctrl.dwFrameInterval; + mutex_unlock(&stream->mutex); + + denominator = 10000000; + uvc_simplify_fraction(&numerator, &denominator, 8, 333); + + memset(parm, 0, sizeof *parm); + parm->type = stream->type; + + if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { + parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; + parm->parm.capture.capturemode = 0; + parm->parm.capture.timeperframe.numerator = numerator; + parm->parm.capture.timeperframe.denominator = denominator; + parm->parm.capture.extendedmode = 0; + parm->parm.capture.readbuffers = 0; + } else { + parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME; + parm->parm.output.outputmode = 0; + parm->parm.output.timeperframe.numerator = numerator; + parm->parm.output.timeperframe.denominator = denominator; + } + + return 0; +} + +static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream, + struct v4l2_streamparm *parm) +{ + struct uvc_streaming_control probe; + struct v4l2_fract timeperframe; + uint32_t interval; + int ret; + + if (parm->type != stream->type) + return -EINVAL; + + if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) + timeperframe = parm->parm.capture.timeperframe; + else + timeperframe = parm->parm.output.timeperframe; + + interval = uvc_fraction_to_interval(timeperframe.numerator, + timeperframe.denominator); + uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n", + timeperframe.numerator, timeperframe.denominator, interval); + + mutex_lock(&stream->mutex); + + if (uvc_queue_streaming(&stream->queue)) { + mutex_unlock(&stream->mutex); + return -EBUSY; + } + + probe = stream->ctrl; + probe.dwFrameInterval = + uvc_try_frame_interval(stream->cur_frame, interval); + + /* Probe the device with the new settings. */ + ret = uvc_probe_video(stream, &probe); + if (ret < 0) { + mutex_unlock(&stream->mutex); + return ret; + } + + stream->ctrl = probe; + mutex_unlock(&stream->mutex); + + /* Return the actual frame period. */ + timeperframe.numerator = probe.dwFrameInterval; + timeperframe.denominator = 10000000; + uvc_simplify_fraction(&timeperframe.numerator, + &timeperframe.denominator, 8, 333); + + if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) + parm->parm.capture.timeperframe = timeperframe; + else + parm->parm.output.timeperframe = timeperframe; + + return 0; +} + +/* ------------------------------------------------------------------------ + * Privilege management + */ + +/* + * Privilege management is the multiple-open implementation basis. The current + * implementation is completely transparent for the end-user and doesn't + * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls. + * Those ioctls enable finer control on the device (by making possible for a + * user to request exclusive access to a device), but are not mature yet. + * Switching to the V4L2 priority mechanism might be considered in the future + * if this situation changes. + * + * Each open instance of a UVC device can either be in a privileged or + * unprivileged state. Only a single instance can be in a privileged state at + * a given time. Trying to perform an operation that requires privileges will + * automatically acquire the required privileges if possible, or return -EBUSY + * otherwise. Privileges are dismissed when closing the instance or when + * freeing the video buffers using VIDIOC_REQBUFS. + * + * Operations that require privileges are: + * + * - VIDIOC_S_INPUT + * - VIDIOC_S_PARM + * - VIDIOC_S_FMT + * - VIDIOC_REQBUFS + */ +static int uvc_acquire_privileges(struct uvc_fh *handle) +{ + /* Always succeed if the handle is already privileged. */ + if (handle->state == UVC_HANDLE_ACTIVE) + return 0; + + /* Check if the device already has a privileged handle. */ + if (atomic_inc_return(&handle->stream->active) != 1) { + atomic_dec(&handle->stream->active); + return -EBUSY; + } + + handle->state = UVC_HANDLE_ACTIVE; + return 0; +} + +static void uvc_dismiss_privileges(struct uvc_fh *handle) +{ + if (handle->state == UVC_HANDLE_ACTIVE) + atomic_dec(&handle->stream->active); + + handle->state = UVC_HANDLE_PASSIVE; +} + +static int uvc_has_privileges(struct uvc_fh *handle) +{ + return handle->state == UVC_HANDLE_ACTIVE; +} + +/* ------------------------------------------------------------------------ + * V4L2 file operations + */ + +static int uvc_v4l2_open(struct file *file) +{ + struct uvc_streaming *stream; + struct uvc_fh *handle; + int ret = 0; + + uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n"); + stream = video_drvdata(file); + + if (stream->dev->state & UVC_DEV_DISCONNECTED) + return -ENODEV; + + ret = usb_autopm_get_interface(stream->dev->intf); + if (ret < 0) + return ret; + + /* Create the device handle. */ + handle = kzalloc(sizeof *handle, GFP_KERNEL); + if (handle == NULL) { + usb_autopm_put_interface(stream->dev->intf); + return -ENOMEM; + } + + mutex_lock(&stream->dev->lock); + if (stream->dev->users == 0) { + ret = uvc_status_start(stream->dev, GFP_KERNEL); + if (ret < 0) { + mutex_unlock(&stream->dev->lock); + usb_autopm_put_interface(stream->dev->intf); + kfree(handle); + return ret; + } + } + + stream->dev->users++; + mutex_unlock(&stream->dev->lock); + + v4l2_fh_init(&handle->vfh, stream->vdev); + v4l2_fh_add(&handle->vfh); + handle->chain = stream->chain; + handle->stream = stream; + handle->state = UVC_HANDLE_PASSIVE; + file->private_data = handle; + + return 0; +} + +static int uvc_v4l2_release(struct file *file) +{ + struct uvc_fh *handle = file->private_data; + struct uvc_streaming *stream = handle->stream; + + uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n"); + + /* Only free resources if this is a privileged handle. */ + if (uvc_has_privileges(handle)) { + uvc_video_enable(stream, 0); + uvc_free_buffers(&stream->queue); + } + + /* Release the file handle. */ + uvc_dismiss_privileges(handle); + v4l2_fh_del(&handle->vfh); + v4l2_fh_exit(&handle->vfh); + kfree(handle); + file->private_data = NULL; + + mutex_lock(&stream->dev->lock); + if (--stream->dev->users == 0) + uvc_status_stop(stream->dev); + mutex_unlock(&stream->dev->lock); + + usb_autopm_put_interface(stream->dev->intf); + return 0; +} + +static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_fh *handle = file->private_data; + struct uvc_video_chain *chain = handle->chain; + struct uvc_streaming *stream = handle->stream; + long ret = 0; + + switch (cmd) { + /* Query capabilities */ + case VIDIOC_QUERYCAP: + { + struct v4l2_capability *cap = arg; + + memset(cap, 0, sizeof *cap); + strlcpy(cap->driver, "uvcvideo", sizeof cap->driver); + strlcpy(cap->card, vdev->name, sizeof cap->card); + usb_make_path(stream->dev->udev, + cap->bus_info, sizeof(cap->bus_info)); + cap->version = LINUX_VERSION_CODE; + cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING + | chain->caps; + if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) + cap->device_caps = V4L2_CAP_VIDEO_CAPTURE + | V4L2_CAP_STREAMING; + else + cap->device_caps = V4L2_CAP_VIDEO_OUTPUT + | V4L2_CAP_STREAMING; + break; + } + + /* Priority */ + case VIDIOC_G_PRIORITY: + *(u32 *)arg = v4l2_prio_max(vdev->prio); + break; + + case VIDIOC_S_PRIORITY: + ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); + if (ret < 0) + return ret; + + return v4l2_prio_change(vdev->prio, &handle->vfh.prio, + *(u32 *)arg); + + /* Get, Set & Query control */ + case VIDIOC_QUERYCTRL: + return uvc_query_v4l2_ctrl(chain, arg); + + case VIDIOC_G_CTRL: + { + struct v4l2_control *ctrl = arg; + struct v4l2_ext_control xctrl; + + memset(&xctrl, 0, sizeof xctrl); + xctrl.id = ctrl->id; + + ret = uvc_ctrl_begin(chain); + if (ret < 0) + return ret; + + ret = uvc_ctrl_get(chain, &xctrl); + uvc_ctrl_rollback(handle); + if (ret >= 0) + ctrl->value = xctrl.value; + break; + } + + case VIDIOC_S_CTRL: + { + struct v4l2_control *ctrl = arg; + struct v4l2_ext_control xctrl; + + ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); + if (ret < 0) + return ret; + + memset(&xctrl, 0, sizeof xctrl); + xctrl.id = ctrl->id; + xctrl.value = ctrl->value; + + ret = uvc_ctrl_begin(chain); + if (ret < 0) + return ret; + + ret = uvc_ctrl_set(chain, &xctrl); + if (ret < 0) { + uvc_ctrl_rollback(handle); + return ret; + } + ret = uvc_ctrl_commit(handle, &xctrl, 1); + if (ret == 0) + ctrl->value = xctrl.value; + break; + } + + case VIDIOC_QUERYMENU: + return uvc_query_v4l2_menu(chain, arg); + + case VIDIOC_G_EXT_CTRLS: + { + struct v4l2_ext_controls *ctrls = arg; + struct v4l2_ext_control *ctrl = ctrls->controls; + unsigned int i; + + ret = uvc_ctrl_begin(chain); + if (ret < 0) + return ret; + + for (i = 0; i < ctrls->count; ++ctrl, ++i) { + ret = uvc_ctrl_get(chain, ctrl); + if (ret < 0) { + uvc_ctrl_rollback(handle); + ctrls->error_idx = i; + return ret; + } + } + ctrls->error_idx = 0; + ret = uvc_ctrl_rollback(handle); + break; + } + + case VIDIOC_S_EXT_CTRLS: + ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); + if (ret < 0) + return ret; + /* Fall through */ + case VIDIOC_TRY_EXT_CTRLS: + { + struct v4l2_ext_controls *ctrls = arg; + struct v4l2_ext_control *ctrl = ctrls->controls; + unsigned int i; + + ret = uvc_ctrl_begin(chain); + if (ret < 0) + return ret; + + for (i = 0; i < ctrls->count; ++ctrl, ++i) { + ret = uvc_ctrl_set(chain, ctrl); + if (ret < 0) { + uvc_ctrl_rollback(handle); + ctrls->error_idx = cmd == VIDIOC_S_EXT_CTRLS + ? ctrls->count : i; + return ret; + } + } + + ctrls->error_idx = 0; + + if (cmd == VIDIOC_S_EXT_CTRLS) + ret = uvc_ctrl_commit(handle, + ctrls->controls, ctrls->count); + else + ret = uvc_ctrl_rollback(handle); + break; + } + + /* Get, Set & Enum input */ + case VIDIOC_ENUMINPUT: + { + const struct uvc_entity *selector = chain->selector; + struct v4l2_input *input = arg; + struct uvc_entity *iterm = NULL; + u32 index = input->index; + int pin = 0; + + if (selector == NULL || + (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { + if (index != 0) + return -EINVAL; + list_for_each_entry(iterm, &chain->entities, chain) { + if (UVC_ENTITY_IS_ITERM(iterm)) + break; + } + pin = iterm->id; + } else if (index < selector->bNrInPins) { + pin = selector->baSourceID[index]; + list_for_each_entry(iterm, &chain->entities, chain) { + if (!UVC_ENTITY_IS_ITERM(iterm)) + continue; + if (iterm->id == pin) + break; + } + } + + if (iterm == NULL || iterm->id != pin) + return -EINVAL; + + memset(input, 0, sizeof *input); + input->index = index; + strlcpy(input->name, iterm->name, sizeof input->name); + if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA) + input->type = V4L2_INPUT_TYPE_CAMERA; + break; + } + + case VIDIOC_G_INPUT: + { + u8 input; + + if (chain->selector == NULL || + (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { + *(int *)arg = 0; + break; + } + + ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, + chain->selector->id, chain->dev->intfnum, + UVC_SU_INPUT_SELECT_CONTROL, &input, 1); + if (ret < 0) + return ret; + + *(int *)arg = input - 1; + break; + } + + case VIDIOC_S_INPUT: + { + u32 input = *(u32 *)arg + 1; + + ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); + if (ret < 0) + return ret; + + if ((ret = uvc_acquire_privileges(handle)) < 0) + return ret; + + if (chain->selector == NULL || + (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { + if (input != 1) + return -EINVAL; + break; + } + + if (input == 0 || input > chain->selector->bNrInPins) + return -EINVAL; + + return uvc_query_ctrl(chain->dev, UVC_SET_CUR, + chain->selector->id, chain->dev->intfnum, + UVC_SU_INPUT_SELECT_CONTROL, &input, 1); + } + + /* Try, Get, Set & Enum format */ + case VIDIOC_ENUM_FMT: + { + struct v4l2_fmtdesc *fmt = arg; + struct uvc_format *format; + enum v4l2_buf_type type = fmt->type; + __u32 index = fmt->index; + + if (fmt->type != stream->type || + fmt->index >= stream->nformats) + return -EINVAL; + + memset(fmt, 0, sizeof(*fmt)); + fmt->index = index; + fmt->type = type; + + format = &stream->format[fmt->index]; + fmt->flags = 0; + if (format->flags & UVC_FMT_FLAG_COMPRESSED) + fmt->flags |= V4L2_FMT_FLAG_COMPRESSED; + strlcpy(fmt->description, format->name, + sizeof fmt->description); + fmt->description[sizeof fmt->description - 1] = 0; + fmt->pixelformat = format->fcc; + break; + } + + case VIDIOC_TRY_FMT: + { + struct uvc_streaming_control probe; + + return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL); + } + + case VIDIOC_S_FMT: + ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); + if (ret < 0) + return ret; + + if ((ret = uvc_acquire_privileges(handle)) < 0) + return ret; + + return uvc_v4l2_set_format(stream, arg); + + case VIDIOC_G_FMT: + return uvc_v4l2_get_format(stream, arg); + + /* Frame size enumeration */ + case VIDIOC_ENUM_FRAMESIZES: + { + struct v4l2_frmsizeenum *fsize = arg; + struct uvc_format *format = NULL; + struct uvc_frame *frame; + int i; + + /* Look for the given pixel format */ + for (i = 0; i < stream->nformats; i++) { + if (stream->format[i].fcc == + fsize->pixel_format) { + format = &stream->format[i]; + break; + } + } + if (format == NULL) + return -EINVAL; + + if (fsize->index >= format->nframes) + return -EINVAL; + + frame = &format->frame[fsize->index]; + fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; + fsize->discrete.width = frame->wWidth; + fsize->discrete.height = frame->wHeight; + break; + } + + /* Frame interval enumeration */ + case VIDIOC_ENUM_FRAMEINTERVALS: + { + struct v4l2_frmivalenum *fival = arg; + struct uvc_format *format = NULL; + struct uvc_frame *frame = NULL; + int i; + + /* Look for the given pixel format and frame size */ + for (i = 0; i < stream->nformats; i++) { + if (stream->format[i].fcc == + fival->pixel_format) { + format = &stream->format[i]; + break; + } + } + if (format == NULL) + return -EINVAL; + + for (i = 0; i < format->nframes; i++) { + if (format->frame[i].wWidth == fival->width && + format->frame[i].wHeight == fival->height) { + frame = &format->frame[i]; + break; + } + } + if (frame == NULL) + return -EINVAL; + + if (frame->bFrameIntervalType) { + if (fival->index >= frame->bFrameIntervalType) + return -EINVAL; + + fival->type = V4L2_FRMIVAL_TYPE_DISCRETE; + fival->discrete.numerator = + frame->dwFrameInterval[fival->index]; + fival->discrete.denominator = 10000000; + uvc_simplify_fraction(&fival->discrete.numerator, + &fival->discrete.denominator, 8, 333); + } else { + fival->type = V4L2_FRMIVAL_TYPE_STEPWISE; + fival->stepwise.min.numerator = + frame->dwFrameInterval[0]; + fival->stepwise.min.denominator = 10000000; + fival->stepwise.max.numerator = + frame->dwFrameInterval[1]; + fival->stepwise.max.denominator = 10000000; + fival->stepwise.step.numerator = + frame->dwFrameInterval[2]; + fival->stepwise.step.denominator = 10000000; + uvc_simplify_fraction(&fival->stepwise.min.numerator, + &fival->stepwise.min.denominator, 8, 333); + uvc_simplify_fraction(&fival->stepwise.max.numerator, + &fival->stepwise.max.denominator, 8, 333); + uvc_simplify_fraction(&fival->stepwise.step.numerator, + &fival->stepwise.step.denominator, 8, 333); + } + break; + } + + /* Get & Set streaming parameters */ + case VIDIOC_G_PARM: + return uvc_v4l2_get_streamparm(stream, arg); + + case VIDIOC_S_PARM: + ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); + if (ret < 0) + return ret; + + if ((ret = uvc_acquire_privileges(handle)) < 0) + return ret; + + return uvc_v4l2_set_streamparm(stream, arg); + + /* Cropping and scaling */ + case VIDIOC_CROPCAP: + { + struct v4l2_cropcap *ccap = arg; + + if (ccap->type != stream->type) + return -EINVAL; + + ccap->bounds.left = 0; + ccap->bounds.top = 0; + + mutex_lock(&stream->mutex); + ccap->bounds.width = stream->cur_frame->wWidth; + ccap->bounds.height = stream->cur_frame->wHeight; + mutex_unlock(&stream->mutex); + + ccap->defrect = ccap->bounds; + + ccap->pixelaspect.numerator = 1; + ccap->pixelaspect.denominator = 1; + break; + } + + case VIDIOC_G_CROP: + case VIDIOC_S_CROP: + return -ENOTTY; + + /* Buffers & streaming */ + case VIDIOC_REQBUFS: + ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); + if (ret < 0) + return ret; + + if ((ret = uvc_acquire_privileges(handle)) < 0) + return ret; + + mutex_lock(&stream->mutex); + ret = uvc_alloc_buffers(&stream->queue, arg); + mutex_unlock(&stream->mutex); + if (ret < 0) + return ret; + + if (ret == 0) + uvc_dismiss_privileges(handle); + + ret = 0; + break; + + case VIDIOC_QUERYBUF: + { + struct v4l2_buffer *buf = arg; + + if (!uvc_has_privileges(handle)) + return -EBUSY; + + return uvc_query_buffer(&stream->queue, buf); + } + + case VIDIOC_CREATE_BUFS: + { + struct v4l2_create_buffers *cb = arg; + + ret = uvc_acquire_privileges(handle); + if (ret < 0) + return ret; + + return uvc_create_buffers(&stream->queue, cb); + } + + case VIDIOC_QBUF: + if (!uvc_has_privileges(handle)) + return -EBUSY; + + return uvc_queue_buffer(&stream->queue, arg); + + case VIDIOC_DQBUF: + if (!uvc_has_privileges(handle)) + return -EBUSY; + + return uvc_dequeue_buffer(&stream->queue, arg, + file->f_flags & O_NONBLOCK); + + case VIDIOC_STREAMON: + { + int *type = arg; + + if (*type != stream->type) + return -EINVAL; + + ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); + if (ret < 0) + return ret; + + if (!uvc_has_privileges(handle)) + return -EBUSY; + + mutex_lock(&stream->mutex); + ret = uvc_video_enable(stream, 1); + mutex_unlock(&stream->mutex); + if (ret < 0) + return ret; + break; + } + + case VIDIOC_STREAMOFF: + { + int *type = arg; + + if (*type != stream->type) + return -EINVAL; + + ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); + if (ret < 0) + return ret; + + if (!uvc_has_privileges(handle)) + return -EBUSY; + + return uvc_video_enable(stream, 0); + } + + case VIDIOC_SUBSCRIBE_EVENT: + { + struct v4l2_event_subscription *sub = arg; + + switch (sub->type) { + case V4L2_EVENT_CTRL: + return v4l2_event_subscribe(&handle->vfh, sub, 0, + &uvc_ctrl_sub_ev_ops); + default: + return -EINVAL; + } + } + + case VIDIOC_UNSUBSCRIBE_EVENT: + return v4l2_event_unsubscribe(&handle->vfh, arg); + + case VIDIOC_DQEVENT: + return v4l2_event_dequeue(&handle->vfh, arg, + file->f_flags & O_NONBLOCK); + + /* Analog video standards make no sense for digital cameras. */ + case VIDIOC_ENUMSTD: + case VIDIOC_QUERYSTD: + case VIDIOC_G_STD: + case VIDIOC_S_STD: + + case VIDIOC_OVERLAY: + + case VIDIOC_ENUMAUDIO: + case VIDIOC_ENUMAUDOUT: + + case VIDIOC_ENUMOUTPUT: + uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd); + return -ENOTTY; + + case UVCIOC_CTRL_MAP: + return uvc_ioctl_ctrl_map(chain, arg); + + case UVCIOC_CTRL_QUERY: + return uvc_xu_ctrl_query(chain, arg); + + default: + uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd); + return -ENOTTY; + } + + return ret; +} + +static long uvc_v4l2_ioctl(struct file *file, + unsigned int cmd, unsigned long arg) +{ + if (uvc_trace_param & UVC_TRACE_IOCTL) { + uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl("); + v4l_printk_ioctl(NULL, cmd); + printk(")\n"); + } + + return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl); +} + +#ifdef CONFIG_COMPAT +struct uvc_xu_control_mapping32 { + __u32 id; + __u8 name[32]; + __u8 entity[16]; + __u8 selector; + + __u8 size; + __u8 offset; + __u32 v4l2_type; + __u32 data_type; + + compat_caddr_t menu_info; + __u32 menu_count; + + __u32 reserved[4]; +}; + +static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp, + const struct uvc_xu_control_mapping32 __user *up) +{ + struct uvc_menu_info __user *umenus; + struct uvc_menu_info __user *kmenus; + compat_caddr_t p; + + if (!access_ok(VERIFY_READ, up, sizeof(*up)) || + __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) || + __get_user(kp->menu_count, &up->menu_count)) + return -EFAULT; + + memset(kp->reserved, 0, sizeof(kp->reserved)); + + if (kp->menu_count == 0) { + kp->menu_info = NULL; + return 0; + } + + if (__get_user(p, &up->menu_info)) + return -EFAULT; + umenus = compat_ptr(p); + if (!access_ok(VERIFY_READ, umenus, kp->menu_count * sizeof(*umenus))) + return -EFAULT; + + kmenus = compat_alloc_user_space(kp->menu_count * sizeof(*kmenus)); + if (kmenus == NULL) + return -EFAULT; + kp->menu_info = kmenus; + + if (copy_in_user(kmenus, umenus, kp->menu_count * sizeof(*umenus))) + return -EFAULT; + + return 0; +} + +static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp, + struct uvc_xu_control_mapping32 __user *up) +{ + struct uvc_menu_info __user *umenus; + struct uvc_menu_info __user *kmenus = kp->menu_info; + compat_caddr_t p; + + if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) || + __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) || + __put_user(kp->menu_count, &up->menu_count)) + return -EFAULT; + + if (__clear_user(up->reserved, sizeof(up->reserved))) + return -EFAULT; + + if (kp->menu_count == 0) + return 0; + + if (get_user(p, &up->menu_info)) + return -EFAULT; + umenus = compat_ptr(p); + + if (copy_in_user(umenus, kmenus, kp->menu_count * sizeof(*umenus))) + return -EFAULT; + + return 0; +} + +struct uvc_xu_control_query32 { + __u8 unit; + __u8 selector; + __u8 query; + __u16 size; + compat_caddr_t data; +}; + +static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp, + const struct uvc_xu_control_query32 __user *up) +{ + u8 __user *udata; + u8 __user *kdata; + compat_caddr_t p; + + if (!access_ok(VERIFY_READ, up, sizeof(*up)) || + __copy_from_user(kp, up, offsetof(typeof(*up), data))) + return -EFAULT; + + if (kp->size == 0) { + kp->data = NULL; + return 0; + } + + if (__get_user(p, &up->data)) + return -EFAULT; + udata = compat_ptr(p); + if (!access_ok(VERIFY_READ, udata, kp->size)) + return -EFAULT; + + kdata = compat_alloc_user_space(kp->size); + if (kdata == NULL) + return -EFAULT; + kp->data = kdata; + + if (copy_in_user(kdata, udata, kp->size)) + return -EFAULT; + + return 0; +} + +static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp, + struct uvc_xu_control_query32 __user *up) +{ + u8 __user *udata; + u8 __user *kdata = kp->data; + compat_caddr_t p; + + if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) || + __copy_to_user(up, kp, offsetof(typeof(*up), data))) + return -EFAULT; + + if (kp->size == 0) + return 0; + + if (get_user(p, &up->data)) + return -EFAULT; + udata = compat_ptr(p); + if (!access_ok(VERIFY_READ, udata, kp->size)) + return -EFAULT; + + if (copy_in_user(udata, kdata, kp->size)) + return -EFAULT; + + return 0; +} + +#define UVCIOC_CTRL_MAP32 _IOWR('u', 0x20, struct uvc_xu_control_mapping32) +#define UVCIOC_CTRL_QUERY32 _IOWR('u', 0x21, struct uvc_xu_control_query32) + +static long uvc_v4l2_compat_ioctl32(struct file *file, + unsigned int cmd, unsigned long arg) +{ + union { + struct uvc_xu_control_mapping xmap; + struct uvc_xu_control_query xqry; + } karg; + void __user *up = compat_ptr(arg); + mm_segment_t old_fs; + long ret; + + switch (cmd) { + case UVCIOC_CTRL_MAP32: + cmd = UVCIOC_CTRL_MAP; + ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up); + break; + + case UVCIOC_CTRL_QUERY32: + cmd = UVCIOC_CTRL_QUERY; + ret = uvc_v4l2_get_xu_query(&karg.xqry, up); + break; + + default: + return -ENOIOCTLCMD; + } + + old_fs = get_fs(); + set_fs(KERNEL_DS); + ret = uvc_v4l2_ioctl(file, cmd, (unsigned long)&karg); + set_fs(old_fs); + + if (ret < 0) + return ret; + + switch (cmd) { + case UVCIOC_CTRL_MAP: + ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up); + break; + + case UVCIOC_CTRL_QUERY: + ret = uvc_v4l2_put_xu_query(&karg.xqry, up); + break; + } + + return ret; +} +#endif + +static ssize_t uvc_v4l2_read(struct file *file, char __user *data, + size_t count, loff_t *ppos) +{ + uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n"); + return -EINVAL; +} + +static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct uvc_fh *handle = file->private_data; + struct uvc_streaming *stream = handle->stream; + + uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n"); + + return uvc_queue_mmap(&stream->queue, vma); +} + +static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait) +{ + struct uvc_fh *handle = file->private_data; + struct uvc_streaming *stream = handle->stream; + + uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n"); + + return uvc_queue_poll(&stream->queue, file, wait); +} + +#ifndef CONFIG_MMU +static unsigned long uvc_v4l2_get_unmapped_area(struct file *file, + unsigned long addr, unsigned long len, unsigned long pgoff, + unsigned long flags) +{ + struct uvc_fh *handle = file->private_data; + struct uvc_streaming *stream = handle->stream; + + uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n"); + + return uvc_queue_get_unmapped_area(&stream->queue, pgoff); +} +#endif + +const struct v4l2_file_operations uvc_fops = { + .owner = THIS_MODULE, + .open = uvc_v4l2_open, + .release = uvc_v4l2_release, + .unlocked_ioctl = uvc_v4l2_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl32 = uvc_v4l2_compat_ioctl32, +#endif + .read = uvc_v4l2_read, + .mmap = uvc_v4l2_mmap, + .poll = uvc_v4l2_poll, +#ifndef CONFIG_MMU + .get_unmapped_area = uvc_v4l2_get_unmapped_area, +#endif +}; + |