diff options
Diffstat (limited to 'drivers/media/video/uvc/uvc_v4l2.c')
| -rw-r--r-- | drivers/media/video/uvc/uvc_v4l2.c | 1105 |
1 files changed, 1105 insertions, 0 deletions
diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c new file mode 100644 index 000000000000..2e0a66575bb4 --- /dev/null +++ b/drivers/media/video/uvc/uvc_v4l2.c @@ -0,0 +1,1105 @@ +/* + * uvc_v4l2.c -- USB Video Class driver - V4L2 API + * + * Copyright (C) 2005-2008 + * Laurent Pinchart (laurent.pinchart@skynet.be) + * + * 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/version.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/usb.h> +#include <linux/videodev2.h> +#include <linux/vmalloc.h> +#include <linux/mm.h> +#include <linux/wait.h> +#include <asm/atomic.h> + +#include <media/v4l2-common.h> + +#include "uvcvideo.h" + +/* ------------------------------------------------------------------------ + * V4L2 interface + */ + +/* + * Mapping V4L2 controls to UVC controls can be straighforward if done well. + * Most of the UVC controls exist in V4L2, and can be mapped directly. Some + * must be grouped (for instance the Red Balance, Blue Balance and Do White + * Balance V4L2 controls use the White Balance Component UVC control) or + * otherwise translated. The approach we take here is to use a translation + * table for the controls which can be mapped directly, and handle the others + * manually. + */ +static int uvc_v4l2_query_menu(struct uvc_video_device *video, + struct v4l2_querymenu *query_menu) +{ + struct uvc_menu_info *menu_info; + struct uvc_control_mapping *mapping; + struct uvc_control *ctrl; + + ctrl = uvc_find_control(video, query_menu->id, &mapping); + if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU) + return -EINVAL; + + if (query_menu->index >= mapping->menu_count) + return -EINVAL; + + menu_info = &mapping->menu_info[query_menu->index]; + strncpy(query_menu->name, menu_info->name, 32); + return 0; +} + +/* + * 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_video_device *video, + 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 != V4L2_BUF_TYPE_VIDEO_CAPTURE) + 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. */ + for (i = 0; i < video->streaming->nformats; ++i) { + format = &video->streaming->format[i]; + if (format->fcc == fmt->fmt.pix.pixelformat) + break; + } + + if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) { + uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n", + fmt->fmt.pix.pixelformat); + return -EINVAL; + } + + /* 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). + */ + if (video->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS) + probe->dwMaxVideoFrameSize = + video->streaming->ctrl.dwMaxVideoFrameSize; + + /* Probe the device */ + if ((ret = uvc_probe_video(video, probe)) < 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_video_device *video, + struct v4l2_format *fmt) +{ + struct uvc_format *format = video->streaming->cur_format; + struct uvc_frame *frame = video->streaming->cur_frame; + + if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + if (format == NULL || frame == NULL) + return -EINVAL; + + 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 = video->streaming->ctrl.dwMaxVideoFrameSize; + fmt->fmt.pix.colorspace = format->colorspace; + fmt->fmt.pix.priv = 0; + + return 0; +} + +static int uvc_v4l2_set_format(struct uvc_video_device *video, + struct v4l2_format *fmt) +{ + struct uvc_streaming_control probe; + struct uvc_format *format; + struct uvc_frame *frame; + int ret; + + if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + if (uvc_queue_streaming(&video->queue)) + return -EBUSY; + + ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame); + if (ret < 0) + return ret; + + if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0) + return ret; + + memcpy(&video->streaming->ctrl, &probe, sizeof probe); + video->streaming->cur_format = format; + video->streaming->cur_frame = frame; + + return 0; +} + +static int uvc_v4l2_get_streamparm(struct uvc_video_device *video, + struct v4l2_streamparm *parm) +{ + uint32_t numerator, denominator; + + if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + numerator = video->streaming->ctrl.dwFrameInterval; + denominator = 10000000; + uvc_simplify_fraction(&numerator, &denominator, 8, 333); + + memset(parm, 0, sizeof *parm); + parm->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; + + return 0; +} + +static int uvc_v4l2_set_streamparm(struct uvc_video_device *video, + struct v4l2_streamparm *parm) +{ + struct uvc_frame *frame = video->streaming->cur_frame; + struct uvc_streaming_control probe; + uint32_t interval; + int ret; + + if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + if (uvc_queue_streaming(&video->queue)) + return -EBUSY; + + memcpy(&probe, &video->streaming->ctrl, sizeof probe); + interval = uvc_fraction_to_interval( + parm->parm.capture.timeperframe.numerator, + parm->parm.capture.timeperframe.denominator); + + uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n", + parm->parm.capture.timeperframe.numerator, + parm->parm.capture.timeperframe.denominator, + interval); + probe.dwFrameInterval = uvc_try_frame_interval(frame, interval); + + /* Probe the device with the new settings. */ + if ((ret = uvc_probe_video(video, &probe)) < 0) + return ret; + + /* Commit the new settings. */ + if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0) + return ret; + + memcpy(&video->streaming->ctrl, &probe, sizeof probe); + + /* Return the actual frame period. */ + parm->parm.capture.timeperframe.numerator = probe.dwFrameInterval; + parm->parm.capture.timeperframe.denominator = 10000000; + uvc_simplify_fraction(&parm->parm.capture.timeperframe.numerator, + &parm->parm.capture.timeperframe.denominator, + 8, 333); + + 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 which requires privileges will + * automatically acquire the required privileges if possible, or return -EBUSY + * otherwise. Privileges are dismissed when closing the instance. + * + * Operations which require privileges are: + * + * - VIDIOC_S_INPUT + * - VIDIOC_S_PARM + * - VIDIOC_S_FMT + * - VIDIOC_TRY_FMT + * - VIDIOC_REQBUFS + */ +static int uvc_acquire_privileges(struct uvc_fh *handle) +{ + int ret = 0; + + /* 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. */ + mutex_lock(&uvc_driver.open_mutex); + if (atomic_inc_return(&handle->device->active) != 1) { + atomic_dec(&handle->device->active); + ret = -EBUSY; + goto done; + } + + handle->state = UVC_HANDLE_ACTIVE; + +done: + mutex_unlock(&uvc_driver.open_mutex); + return ret; +} + +static void uvc_dismiss_privileges(struct uvc_fh *handle) +{ + if (handle->state == UVC_HANDLE_ACTIVE) + atomic_dec(&handle->device->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 inode *inode, struct file *file) +{ + struct video_device *vdev; + struct uvc_video_device *video; + struct uvc_fh *handle; + int ret = 0; + + uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n"); + mutex_lock(&uvc_driver.open_mutex); + vdev = video_devdata(file); + video = video_get_drvdata(vdev); + + if (video->dev->state & UVC_DEV_DISCONNECTED) { + ret = -ENODEV; + goto done; + } + + ret = usb_autopm_get_interface(video->dev->intf); + if (ret < 0) + goto done; + + /* Create the device handle. */ + handle = kzalloc(sizeof *handle, GFP_KERNEL); + if (handle == NULL) { + usb_autopm_put_interface(video->dev->intf); + ret = -ENOMEM; + goto done; + } + + handle->device = video; + handle->state = UVC_HANDLE_PASSIVE; + file->private_data = handle; + + kref_get(&video->dev->kref); + +done: + mutex_unlock(&uvc_driver.open_mutex); + return ret; +} + +static int uvc_v4l2_release(struct inode *inode, struct file *file) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_video_device *video = video_get_drvdata(vdev); + struct uvc_fh *handle = (struct uvc_fh *)file->private_data; + + 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(video, 0); + + mutex_lock(&video->queue.mutex); + if (uvc_free_buffers(&video->queue) < 0) + uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to " + "free buffers.\n"); + mutex_unlock(&video->queue.mutex); + } + + /* Release the file handle. */ + uvc_dismiss_privileges(handle); + kfree(handle); + file->private_data = NULL; + + usb_autopm_put_interface(video->dev->intf); + kref_put(&video->dev->kref, uvc_delete); + return 0; +} + +static int uvc_v4l2_do_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, void *arg) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_video_device *video = video_get_drvdata(vdev); + struct uvc_fh *handle = (struct uvc_fh *)file->private_data; + int ret = 0; + + if (uvc_trace_param & UVC_TRACE_IOCTL) + v4l_printk_ioctl(cmd); + + switch (cmd) { + /* Query capabilities */ + case VIDIOC_QUERYCAP: + { + struct v4l2_capability *cap = arg; + + memset(cap, 0, sizeof *cap); + strncpy(cap->driver, "uvcvideo", sizeof cap->driver); + strncpy(cap->card, vdev->name, 32); + strncpy(cap->bus_info, video->dev->udev->bus->bus_name, + sizeof cap->bus_info); + cap->version = DRIVER_VERSION_NUMBER; + cap->capabilities = V4L2_CAP_VIDEO_CAPTURE + | V4L2_CAP_STREAMING; + break; + } + + /* Get, Set & Query control */ + case VIDIOC_QUERYCTRL: + return uvc_query_v4l2_ctrl(video, arg); + + case VIDIOC_G_CTRL: + { + struct v4l2_control *ctrl = arg; + struct v4l2_ext_control xctrl; + + memset(&xctrl, 0, sizeof xctrl); + xctrl.id = ctrl->id; + + uvc_ctrl_begin(video); + ret = uvc_ctrl_get(video, &xctrl); + uvc_ctrl_rollback(video); + if (ret >= 0) + ctrl->value = xctrl.value; + break; + } + + case VIDIOC_S_CTRL: + { + struct v4l2_control *ctrl = arg; + struct v4l2_ext_control xctrl; + + memset(&xctrl, 0, sizeof xctrl); + xctrl.id = ctrl->id; + xctrl.value = ctrl->value; + + uvc_ctrl_begin(video); + ret = uvc_ctrl_set(video, &xctrl); + if (ret < 0) { + uvc_ctrl_rollback(video); + return ret; + } + ret = uvc_ctrl_commit(video); + break; + } + + case VIDIOC_QUERYMENU: + return uvc_v4l2_query_menu(video, arg); + + case VIDIOC_G_EXT_CTRLS: + { + struct v4l2_ext_controls *ctrls = arg; + struct v4l2_ext_control *ctrl = ctrls->controls; + unsigned int i; + + uvc_ctrl_begin(video); + for (i = 0; i < ctrls->count; ++ctrl, ++i) { + ret = uvc_ctrl_get(video, ctrl); + if (ret < 0) { + uvc_ctrl_rollback(video); + ctrls->error_idx = i; + return ret; + } + } + ctrls->error_idx = 0; + ret = uvc_ctrl_rollback(video); + break; + } + + case VIDIOC_S_EXT_CTRLS: + 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(video); + if (ret < 0) + return ret; + + for (i = 0; i < ctrls->count; ++ctrl, ++i) { + ret = uvc_ctrl_set(video, ctrl); + if (ret < 0) { + uvc_ctrl_rollback(video); + ctrls->error_idx = i; + return ret; + } + } + + ctrls->error_idx = 0; + + if (cmd == VIDIOC_S_EXT_CTRLS) + ret = uvc_ctrl_commit(video); + else + ret = uvc_ctrl_rollback(video); + break; + } + + /* Get, Set & Enum input */ + case VIDIOC_ENUMINPUT: + { + const struct uvc_entity *selector = video->selector; + struct v4l2_input *input = arg; + struct uvc_entity *iterm = NULL; + u32 index = input->index; + int pin = 0; + + if (selector == NULL || + (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { + if (index != 0) + return -EINVAL; + iterm = list_first_entry(&video->iterms, + struct uvc_entity, chain); + pin = iterm->id; + } else if (pin < selector->selector.bNrInPins) { + pin = selector->selector.baSourceID[index]; + list_for_each_entry(iterm, video->iterms.next, chain) { + if (iterm->id == pin) + break; + } + } + + if (iterm == NULL || iterm->id != pin) + return -EINVAL; + + memset(input, 0, sizeof *input); + input->index = index; + strncpy(input->name, iterm->name, sizeof input->name); + if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA) + input->type = V4L2_INPUT_TYPE_CAMERA; + break; + } + + case VIDIOC_G_INPUT: + { + u8 input; + + if (video->selector == NULL || + (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { + *(int *)arg = 0; + break; + } + + ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id, + video->dev->intfnum, SU_INPUT_SELECT_CONTROL, + &input, 1); + if (ret < 0) + return ret; + + *(int *)arg = input - 1; + break; + } + + case VIDIOC_S_INPUT: + { + u8 input = *(u32 *)arg + 1; + + if ((ret = uvc_acquire_privileges(handle)) < 0) + return ret; + + if (video->selector == NULL || + (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { + if (input != 1) + return -EINVAL; + break; + } + + if (input > video->selector->selector.bNrInPins) + return -EINVAL; + + return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id, + video->dev->intfnum, SU_INPUT_SELECT_CONTROL, + &input, 1); + } + + /* Try, Get, Set & Enum format */ + case VIDIOC_ENUM_FMT: + { + struct v4l2_fmtdesc *fmt = arg; + struct uvc_format *format; + + if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE || + fmt->index >= video->streaming->nformats) + return -EINVAL; + + format = &video->streaming->format[fmt->index]; + fmt->flags = 0; + if (format->flags & UVC_FMT_FLAG_COMPRESSED) + fmt->flags |= V4L2_FMT_FLAG_COMPRESSED; + strncpy(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; + + if ((ret = uvc_acquire_privileges(handle)) < 0) + return ret; + + return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL); + } + + case VIDIOC_S_FMT: + if ((ret = uvc_acquire_privileges(handle)) < 0) + return ret; + + return uvc_v4l2_set_format(video, arg); + + case VIDIOC_G_FMT: + return uvc_v4l2_get_format(video, 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 < video->streaming->nformats; i++) { + if (video->streaming->format[i].fcc == + fsize->pixel_format) { + format = &video->streaming->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 < video->streaming->nformats; i++) { + if (video->streaming->format[i].fcc == + fival->pixel_format) { + format = &video->streaming->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(video, arg); + + case VIDIOC_S_PARM: + if ((ret = uvc_acquire_privileges(handle)) < 0) + return ret; + + return uvc_v4l2_set_streamparm(video, arg); + + /* Cropping and scaling */ + case VIDIOC_CROPCAP: + { + struct v4l2_cropcap *ccap = arg; + struct uvc_frame *frame = video->streaming->cur_frame; + + if (ccap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + ccap->bounds.left = 0; + ccap->bounds.top = 0; + ccap->bounds.width = frame->wWidth; + ccap->bounds.height = frame->wHeight; + + ccap->defrect = ccap->bounds; + + ccap->pixelaspect.numerator = 1; + ccap->pixelaspect.denominator = 1; + break; + } + + case VIDIOC_G_CROP: + case VIDIOC_S_CROP: + return -EINVAL; + + /* Buffers & streaming */ + case VIDIOC_REQBUFS: + { + struct v4l2_requestbuffers *rb = arg; + unsigned int bufsize = + video->streaming->ctrl.dwMaxVideoFrameSize; + + if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE || + rb->memory != V4L2_MEMORY_MMAP) + return -EINVAL; + + if ((ret = uvc_acquire_privileges(handle)) < 0) + return ret; + + ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize); + if (ret < 0) + return ret; + + if (!(video->streaming->cur_format->flags & + UVC_FMT_FLAG_COMPRESSED)) + video->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE; + + rb->count = ret; + ret = 0; + break; + } + + case VIDIOC_QUERYBUF: + { + struct v4l2_buffer *buf = arg; + + if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + if (!uvc_has_privileges(handle)) + return -EBUSY; + + return uvc_query_buffer(&video->queue, buf); + } + + case VIDIOC_QBUF: + if (!uvc_has_privileges(handle)) + return -EBUSY; + + return uvc_queue_buffer(&video->queue, arg); + + case VIDIOC_DQBUF: + if (!uvc_has_privileges(handle)) + return -EBUSY; + + return uvc_dequeue_buffer(&video->queue, arg, + file->f_flags & O_NONBLOCK); + + case VIDIOC_STREAMON: + { + int *type = arg; + + if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + if (!uvc_has_privileges(handle)) + return -EBUSY; + + if ((ret = uvc_video_enable(video, 1)) < 0) + return ret; + break; + } + + case VIDIOC_STREAMOFF: + { + int *type = arg; + + if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + if (!uvc_has_privileges(handle)) + return -EBUSY; + + return uvc_video_enable(video, 0); + } + + /* 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 -EINVAL; + + /* Dynamic controls. */ + case UVCIOC_CTRL_ADD: + { + struct uvc_xu_control_info *xinfo = arg; + struct uvc_control_info *info; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + info = kmalloc(sizeof *info, GFP_KERNEL); + if (info == NULL) + return -ENOMEM; + + memcpy(info->entity, xinfo->entity, sizeof info->entity); + info->index = xinfo->index; + info->selector = xinfo->selector; + info->size = xinfo->size; + info->flags = xinfo->flags; + + info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX | + UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF; + + ret = uvc_ctrl_add_info(info); + if (ret < 0) + kfree(info); + break; + } + + case UVCIOC_CTRL_MAP: + { + struct uvc_xu_control_mapping *xmap = arg; + struct uvc_control_mapping *map; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + map = kmalloc(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; + + ret = uvc_ctrl_add_mapping(map); + if (ret < 0) + kfree(map); + break; + } + + case UVCIOC_CTRL_GET: + return uvc_xu_ctrl_query(video, arg, 0); + + case UVCIOC_CTRL_SET: + return uvc_xu_ctrl_query(video, arg, 1); + + default: + if ((ret = v4l_compat_translate_ioctl(inode, file, cmd, arg, + uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD) + uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", + cmd); + return ret; + } + + return ret; +} + +static int uvc_v4l2_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_ioctl\n"); + return video_usercopy(inode, file, cmd, arg, uvc_v4l2_do_ioctl); +} + +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 -ENODEV; +} + +/* + * VMA operations. + */ +static void uvc_vm_open(struct vm_area_struct *vma) +{ + struct uvc_buffer *buffer = vma->vm_private_data; + buffer->vma_use_count++; +} + +static void uvc_vm_close(struct vm_area_struct *vma) +{ + struct uvc_buffer *buffer = vma->vm_private_data; + buffer->vma_use_count--; +} + +static struct vm_operations_struct uvc_vm_ops = { + .open = uvc_vm_open, + .close = uvc_vm_close, +}; + +static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_video_device *video = video_get_drvdata(vdev); + struct uvc_buffer *buffer; + struct page *page; + unsigned long addr, start, size; + unsigned int i; + int ret = 0; + + uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n"); + + start = vma->vm_start; + size = vma->vm_end - vma->vm_start; + + mutex_lock(&video->queue.mutex); + + for (i = 0; i < video->queue.count; ++i) { + buffer = &video->queue.buffer[i]; + if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff) + break; + } + + if (i == video->queue.count || size != video->queue.buf_size) { + ret = -EINVAL; + goto done; + } + + /* + * VM_IO marks the area as being an mmaped region for I/O to a + * device. It also prevents the region from being core dumped. + */ + vma->vm_flags |= VM_IO; + + addr = (unsigned long)video->queue.mem + buffer->buf.m.offset; + while (size > 0) { + page = vmalloc_to_page((void *)addr); + if ((ret = vm_insert_page(vma, start, page)) < 0) + goto done; + + start += PAGE_SIZE; + addr += PAGE_SIZE; + size -= PAGE_SIZE; + } + + vma->vm_ops = &uvc_vm_ops; + vma->vm_private_data = buffer; + uvc_vm_open(vma); + +done: + mutex_unlock(&video->queue.mutex); + return ret; +} + +static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_video_device *video = video_get_drvdata(vdev); + + uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n"); + + return uvc_queue_poll(&video->queue, file, wait); +} + +struct file_operations uvc_fops = { + .owner = THIS_MODULE, + .open = uvc_v4l2_open, + .release = uvc_v4l2_release, + .ioctl = uvc_v4l2_ioctl, + .compat_ioctl = v4l_compat_ioctl32, + .llseek = no_llseek, + .read = uvc_v4l2_read, + .mmap = uvc_v4l2_mmap, + .poll = uvc_v4l2_poll, +}; |
