From patchwork Wed Oct 25 03:14:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jack Zhu X-Patchwork-Id: 13435439 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D4DA1C25B6F for ; Wed, 25 Oct 2023 03:14:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232555AbjJYDOu convert rfc822-to-8bit (ORCPT ); Tue, 24 Oct 2023 23:14:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49584 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232417AbjJYDOi (ORCPT ); Tue, 24 Oct 2023 23:14:38 -0400 Received: from fd01.gateway.ufhost.com (fd01.gateway.ufhost.com [61.152.239.71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1B4D513D; Tue, 24 Oct 2023 20:14:33 -0700 (PDT) Received: from EXMBX166.cuchost.com (unknown [175.102.18.54]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "EXMBX166", Issuer "EXMBX166" (not verified)) by fd01.gateway.ufhost.com (Postfix) with ESMTP id 2335124E13F; Wed, 25 Oct 2023 11:14:26 +0800 (CST) Received: from EXMBX073.cuchost.com (172.16.6.83) by EXMBX166.cuchost.com (172.16.6.76) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Wed, 25 Oct 2023 11:14:26 +0800 Received: from xiaofei.localdomain (180.164.60.184) by EXMBX073.cuchost.com (172.16.6.83) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Wed, 25 Oct 2023 11:14:25 +0800 From: Jack Zhu To: Mauro Carvalho Chehab , Robert Foss , Todor Tomov , , Rob Herring , "Krzysztof Kozlowski" , Conor Dooley , Greg Kroah-Hartman , Philipp Zabel , Laurent Pinchart , Hans Verkuil CC: , , , , , Subject: [PATCH v11 4/9] media: staging: media: starfive: camss: Add video driver Date: Wed, 25 Oct 2023 11:14:17 +0800 Message-ID: <20231025031422.3695-5-jack.zhu@starfivetech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231025031422.3695-1-jack.zhu@starfivetech.com> References: <20231025031422.3695-1-jack.zhu@starfivetech.com> MIME-Version: 1.0 X-Originating-IP: [180.164.60.184] X-ClientProxiedBy: EXCAS062.cuchost.com (172.16.6.22) To EXMBX073.cuchost.com (172.16.6.83) X-YovoleRuleAgent: yovoleflag Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add video driver for StarFive Camera Subsystem. Signed-off-by: Jack Zhu --- drivers/staging/media/starfive/camss/Makefile | 3 +- .../staging/media/starfive/camss/stf-video.c | 572 ++++++++++++++++++ .../staging/media/starfive/camss/stf-video.h | 100 +++ 3 files changed, 674 insertions(+), 1 deletion(-) create mode 100644 drivers/staging/media/starfive/camss/stf-video.c create mode 100644 drivers/staging/media/starfive/camss/stf-video.h diff --git a/drivers/staging/media/starfive/camss/Makefile b/drivers/staging/media/starfive/camss/Makefile index 78211e30550f..7d320b9317c8 100644 --- a/drivers/staging/media/starfive/camss/Makefile +++ b/drivers/staging/media/starfive/camss/Makefile @@ -4,6 +4,7 @@ # starfive-camss-objs += \ - stf-camss.o + stf-camss.o \ + stf-video.o obj-$(CONFIG_VIDEO_STARFIVE_CAMSS) += starfive-camss.o diff --git a/drivers/staging/media/starfive/camss/stf-video.c b/drivers/staging/media/starfive/camss/stf-video.c new file mode 100644 index 000000000000..0b305f21eb53 --- /dev/null +++ b/drivers/staging/media/starfive/camss/stf-video.c @@ -0,0 +1,572 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * stf_video.c + * + * StarFive Camera Subsystem - V4L2 device node + * + * Copyright (C) 2021-2023 StarFive Technology Co., Ltd. + */ + +#include +#include +#include +#include +#include + +#include "stf-camss.h" +#include "stf-video.h" + +/* ----------------------------------------------------------------------------- + * Helper functions + */ + +static inline struct stfcamss_buffer * +to_stfcamss_buffer(struct vb2_v4l2_buffer *vbuf) +{ + return container_of(vbuf, struct stfcamss_buffer, vb); +} + +static const struct stfcamss_format_info * +video_g_fi_by_index(struct stfcamss_video *video, int index) +{ + if (index >= video->nformats) + return NULL; + + return &video->formats[index]; +} + +static const struct stfcamss_format_info * +video_g_fi_by_mcode(struct stfcamss_video *video, u32 mcode) +{ + unsigned int i; + + for (i = 0; i < video->nformats; i++) { + if (video->formats[i].code == mcode) + return &video->formats[i]; + } + + return NULL; +} + +static const struct stfcamss_format_info * +video_g_fi_by_pfmt(struct stfcamss_video *video, u32 pixelformat) +{ + unsigned int i; + + for (i = 0; i < video->nformats; i++) { + if (video->formats[i].pixelformat == pixelformat) + return &video->formats[i]; + } + + return NULL; +} + +static int __video_try_fmt(struct stfcamss_video *video, struct v4l2_format *f) +{ + struct v4l2_pix_format *pix = &f->fmt.pix; + const struct stfcamss_format_info *fi; + u32 width, height; + u32 bpl; + unsigned int i; + + fi = video_g_fi_by_pfmt(video, pix->pixelformat); + if (!fi) + fi = &video->formats[0]; /* default format */ + + width = pix->width; + height = pix->height; + + memset(pix, 0, sizeof(*pix)); + + pix->pixelformat = fi->pixelformat; + pix->width = clamp_t(u32, width, STFCAMSS_FRAME_MIN_WIDTH, + STFCAMSS_FRAME_MAX_WIDTH); + pix->height = clamp_t(u32, height, STFCAMSS_FRAME_MIN_HEIGHT, + STFCAMSS_FRAME_MAX_HEIGHT); + bpl = pix->width * fi->bpp / 8; + bpl = ALIGN(bpl, video->bpl_alignment); + pix->bytesperline = bpl; + + for (i = 0; i < fi->planes; ++i) + pix->sizeimage += bpl * pix->height / fi->vsub[i]; + + pix->field = V4L2_FIELD_NONE; + pix->colorspace = V4L2_COLORSPACE_SRGB; + pix->flags = 0; + pix->ycbcr_enc = + V4L2_MAP_YCBCR_ENC_DEFAULT(pix->colorspace); + pix->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true, + pix->colorspace, + pix->ycbcr_enc); + pix->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(pix->colorspace); + + return 0; +} + +static int stf_video_init_format(struct stfcamss_video *video) +{ + int ret; + struct v4l2_format format = { + .type = video->type, + .fmt.pix = { + .width = 1920, + .height = 1080, + .pixelformat = V4L2_PIX_FMT_NV12, + }, + }; + + ret = __video_try_fmt(video, &format); + + if (ret < 0) + return ret; + + video->active_fmt = format; + + return 0; +} + +/* ----------------------------------------------------------------------------- + * Video queue operations + */ + +static int video_queue_setup(struct vb2_queue *q, + unsigned int *num_buffers, + unsigned int *num_planes, + unsigned int sizes[], + struct device *alloc_devs[]) +{ + struct stfcamss_video *video = vb2_get_drv_priv(q); + const struct v4l2_pix_format *format = &video->active_fmt.fmt.pix; + + if (*num_planes) { + if (*num_planes != 1) + return -EINVAL; + + if (sizes[0] < format->sizeimage) + return -EINVAL; + } else { + *num_planes = 1; + sizes[0] = format->sizeimage; + } + + if (!sizes[0]) { + dev_dbg(video->stfcamss->dev, + "%s: error size is zero.\n", __func__); + return -EINVAL; + } + + dev_dbg(video->stfcamss->dev, "planes = %d, size = %d\n", + *num_planes, sizes[0]); + + return 0; +} + +static int video_buf_init(struct vb2_buffer *vb) +{ + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); + struct stfcamss_video *video = vb2_get_drv_priv(vb->vb2_queue); + struct stfcamss_buffer *buffer = to_stfcamss_buffer(vbuf); + const struct v4l2_pix_format *fmt = &video->active_fmt.fmt.pix; + dma_addr_t *paddr; + + paddr = vb2_plane_cookie(vb, 0); + buffer->addr[0] = *paddr; + + if (fmt->pixelformat == V4L2_PIX_FMT_NV12) + buffer->addr[1] = + buffer->addr[0] + fmt->bytesperline * fmt->height; + + return 0; +} + +static int video_buf_prepare(struct vb2_buffer *vb) +{ + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); + struct stfcamss_video *video = vb2_get_drv_priv(vb->vb2_queue); + const struct v4l2_pix_format *fmt = &video->active_fmt.fmt.pix; + + if (fmt->sizeimage > vb2_plane_size(vb, 0)) { + dev_dbg(video->stfcamss->dev, + "sizeimage = %u, plane size = %u\n", + fmt->sizeimage, (unsigned int)vb2_plane_size(vb, 0)); + return -EINVAL; + } + vb2_set_plane_payload(vb, 0, fmt->sizeimage); + + vbuf->field = V4L2_FIELD_NONE; + + return 0; +} + +static void video_buf_queue(struct vb2_buffer *vb) +{ + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); + struct stfcamss_video *video = vb2_get_drv_priv(vb->vb2_queue); + struct stfcamss_buffer *buffer = to_stfcamss_buffer(vbuf); + + video->ops->queue_buffer(video, buffer); +} + +static int video_get_subdev_format(struct stfcamss_video *video, + struct v4l2_subdev_format *fmt) +{ + struct v4l2_subdev *subdev; + struct media_pad *pad; + struct media_entity *entity; + int ret; + + entity = &video->vdev.entity; + while (1) { + pad = &entity->pads[0]; + if (!(pad->flags & MEDIA_PAD_FL_SINK)) + break; + + pad = media_pad_remote_pad_first(pad); + if (!pad || !is_media_entity_v4l2_subdev(pad->entity)) + break; + + entity = pad->entity; + subdev = media_entity_to_v4l2_subdev(entity); + + fmt->pad = pad->index; + + ret = v4l2_subdev_call_state_active(subdev, pad, get_fmt, fmt); + if (ret < 0 && ret != -ENOIOCTLCMD) + return ret; + else if (!ret) + break; + } + + return 0; +} + +static int stf_video_check_format(struct stfcamss_video *video) +{ + struct v4l2_pix_format *pix = &video->active_fmt.fmt.pix; + const struct stfcamss_format_info *fi; + int ret; + struct v4l2_subdev_format sd_fmt = { + .which = V4L2_SUBDEV_FORMAT_ACTIVE, + }; + + ret = video_get_subdev_format(video, &sd_fmt); + if (ret < 0) + return ret; + + fi = video_g_fi_by_mcode(video, sd_fmt.format.code); + if (!fi) + return -EINVAL; + + if (pix->pixelformat != fi->pixelformat || + pix->height != sd_fmt.format.height || + pix->width != sd_fmt.format.width || + pix->field != sd_fmt.format.field) + return -EPIPE; + + return 0; +} + +static int video_start_streaming(struct vb2_queue *q, unsigned int count) +{ + struct stfcamss_video *video = vb2_get_drv_priv(q); + struct video_device *vdev = &video->vdev; + int ret; + + ret = video_device_pipeline_start(vdev, &video->stfcamss->pipe); + if (ret < 0) { + dev_err(video->stfcamss->dev, + "Failed to media_pipeline_start: %d\n", ret); + goto err_ret_buffers; + } + + ret = pm_runtime_resume_and_get(video->stfcamss->dev); + if (ret < 0) { + dev_err(video->stfcamss->dev, "power up failed %d\n", ret); + goto err_pipeline_stop; + } + + video->ops->start_streaming(video); + + ret = v4l2_subdev_call(video->source_subdev, video, s_stream, true); + if (ret) { + dev_err(video->stfcamss->dev, "stream on failed\n"); + goto err_pm_put; + } + + return 0; + +err_pm_put: + pm_runtime_put(video->stfcamss->dev); +err_pipeline_stop: + video_device_pipeline_stop(vdev); +err_ret_buffers: + video->ops->flush_buffers(video, VB2_BUF_STATE_QUEUED); + return ret; +} + +static void video_stop_streaming(struct vb2_queue *q) +{ + struct stfcamss_video *video = vb2_get_drv_priv(q); + struct video_device *vdev = &video->vdev; + + video->ops->stop_streaming(video); + + v4l2_subdev_call(video->source_subdev, video, s_stream, false); + + pm_runtime_put(video->stfcamss->dev); + + video_device_pipeline_stop(vdev); + video->ops->flush_buffers(video, VB2_BUF_STATE_ERROR); +} + +static const struct vb2_ops stf_video_vb2_q_ops = { + .queue_setup = video_queue_setup, + .wait_prepare = vb2_ops_wait_prepare, + .wait_finish = vb2_ops_wait_finish, + .buf_init = video_buf_init, + .buf_prepare = video_buf_prepare, + .buf_queue = video_buf_queue, + .start_streaming = video_start_streaming, + .stop_streaming = video_stop_streaming, +}; + +/* ----------------------------------------------------------------------------- + * V4L2 ioctls + */ + +static int video_querycap(struct file *file, void *fh, + struct v4l2_capability *cap) +{ + strscpy(cap->driver, "starfive-camss", sizeof(cap->driver)); + strscpy(cap->card, "Starfive Camera Subsystem", sizeof(cap->card)); + + return 0; +} + +static int video_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f) +{ + struct stfcamss_video *video = video_drvdata(file); + const struct stfcamss_format_info *fi; + + if (f->index >= video->nformats) + return -EINVAL; + + if (f->mbus_code) { + /* Each entry in formats[] table has unique mbus_code */ + if (f->index > 0) + return -EINVAL; + + fi = video_g_fi_by_mcode(video, f->mbus_code); + } else { + fi = video_g_fi_by_index(video, f->index); + } + + if (!fi) + return -EINVAL; + + f->pixelformat = fi->pixelformat; + + return 0; +} + +static int video_enum_framesizes(struct file *file, void *fh, + struct v4l2_frmsizeenum *fsize) +{ + struct stfcamss_video *video = video_drvdata(file); + unsigned int i; + + if (fsize->index) + return -EINVAL; + + for (i = 0; i < video->nformats; i++) { + if (video->formats[i].pixelformat == fsize->pixel_format) + break; + } + + if (i == video->nformats) + return -EINVAL; + + fsize->type = V4L2_FRMSIZE_TYPE_CONTINUOUS; + fsize->stepwise.min_width = STFCAMSS_FRAME_MIN_WIDTH; + fsize->stepwise.max_width = STFCAMSS_FRAME_MAX_WIDTH; + fsize->stepwise.min_height = STFCAMSS_FRAME_MIN_HEIGHT; + fsize->stepwise.max_height = STFCAMSS_FRAME_MAX_HEIGHT; + fsize->stepwise.step_width = 1; + fsize->stepwise.step_height = 1; + + return 0; +} + +static int video_g_fmt(struct file *file, void *fh, struct v4l2_format *f) +{ + struct stfcamss_video *video = video_drvdata(file); + + *f = video->active_fmt; + + return 0; +} + +static int video_s_fmt(struct file *file, void *fh, struct v4l2_format *f) +{ + struct stfcamss_video *video = video_drvdata(file); + int ret; + + if (vb2_is_busy(&video->vb2_q)) + return -EBUSY; + + ret = __video_try_fmt(video, f); + if (ret < 0) + return ret; + + video->active_fmt = *f; + + return 0; +} + +static int video_try_fmt(struct file *file, void *fh, struct v4l2_format *f) +{ + struct stfcamss_video *video = video_drvdata(file); + + return __video_try_fmt(video, f); +} + +static const struct v4l2_ioctl_ops stf_vid_ioctl_ops = { + .vidioc_querycap = video_querycap, + .vidioc_enum_fmt_vid_cap = video_enum_fmt, + .vidioc_enum_framesizes = video_enum_framesizes, + .vidioc_g_fmt_vid_cap = video_g_fmt, + .vidioc_s_fmt_vid_cap = video_s_fmt, + .vidioc_try_fmt_vid_cap = video_try_fmt, + .vidioc_reqbufs = vb2_ioctl_reqbufs, + .vidioc_querybuf = vb2_ioctl_querybuf, + .vidioc_qbuf = vb2_ioctl_qbuf, + .vidioc_expbuf = vb2_ioctl_expbuf, + .vidioc_dqbuf = vb2_ioctl_dqbuf, + .vidioc_create_bufs = vb2_ioctl_create_bufs, + .vidioc_prepare_buf = vb2_ioctl_prepare_buf, + .vidioc_streamon = vb2_ioctl_streamon, + .vidioc_streamoff = vb2_ioctl_streamoff, +}; + +/* ----------------------------------------------------------------------------- + * V4L2 file operations + */ + +static const struct v4l2_file_operations stf_vid_fops = { + .owner = THIS_MODULE, + .unlocked_ioctl = video_ioctl2, + .open = v4l2_fh_open, + .release = vb2_fop_release, + .poll = vb2_fop_poll, + .mmap = vb2_fop_mmap, + .read = vb2_fop_read, +}; + +/* ----------------------------------------------------------------------------- + * STFCAMSS video core + */ + +static int stf_link_validate(struct media_link *link) +{ + struct video_device *vdev = + media_entity_to_video_device(link->sink->entity); + struct stfcamss_video *video = video_get_drvdata(vdev); + int ret; + + ret = stf_video_check_format(video); + + return ret; +} + +static const struct media_entity_operations stf_media_ops = { + .link_validate = stf_link_validate, +}; + +static void stf_video_release(struct video_device *vdev) +{ + struct stfcamss_video *video = video_get_drvdata(vdev); + + media_entity_cleanup(&vdev->entity); + + mutex_destroy(&video->q_lock); + mutex_destroy(&video->lock); +} + +int stf_video_register(struct stfcamss_video *video, + struct v4l2_device *v4l2_dev, const char *name) +{ + struct video_device *vdev = &video->vdev; + struct vb2_queue *q; + struct media_pad *pad = &video->pad; + int ret; + + mutex_init(&video->q_lock); + mutex_init(&video->lock); + + q = &video->vb2_q; + q->drv_priv = video; + q->mem_ops = &vb2_dma_contig_memops; + q->ops = &stf_video_vb2_q_ops; + q->type = video->type; + q->io_modes = VB2_DMABUF | VB2_MMAP; + q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; + q->buf_struct_size = sizeof(struct stfcamss_buffer); + q->dev = video->stfcamss->dev; + q->lock = &video->q_lock; + q->min_buffers_needed = STFCAMSS_MIN_BUFFERS; + ret = vb2_queue_init(q); + if (ret < 0) { + dev_err(video->stfcamss->dev, + "Failed to init vb2 queue: %d\n", ret); + goto err_mutex_destroy; + } + + pad->flags = MEDIA_PAD_FL_SINK; + ret = media_entity_pads_init(&vdev->entity, 1, pad); + if (ret < 0) { + dev_err(video->stfcamss->dev, + "Failed to init video entity: %d\n", ret); + goto err_mutex_destroy; + } + + ret = stf_video_init_format(video); + if (ret < 0) { + dev_err(video->stfcamss->dev, + "Failed to init format: %d\n", ret); + goto err_media_cleanup; + } + + vdev->fops = &stf_vid_fops; + vdev->ioctl_ops = &stf_vid_ioctl_ops; + vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; + vdev->entity.ops = &stf_media_ops; + vdev->vfl_dir = VFL_DIR_RX; + vdev->release = stf_video_release; + vdev->v4l2_dev = v4l2_dev; + vdev->queue = &video->vb2_q; + vdev->lock = &video->lock; + strscpy(vdev->name, name, sizeof(vdev->name)); + + video_set_drvdata(vdev, video); + + ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1); + if (ret < 0) { + dev_err(video->stfcamss->dev, + "Failed to register video device: %d\n", ret); + goto err_media_cleanup; + } + + return 0; + +err_media_cleanup: + media_entity_cleanup(&vdev->entity); +err_mutex_destroy: + mutex_destroy(&video->lock); + mutex_destroy(&video->q_lock); + return ret; +} + +void stf_video_unregister(struct stfcamss_video *video) +{ + vb2_video_unregister_device(&video->vdev); +} diff --git a/drivers/staging/media/starfive/camss/stf-video.h b/drivers/staging/media/starfive/camss/stf-video.h new file mode 100644 index 000000000000..8052b77e3ad8 --- /dev/null +++ b/drivers/staging/media/starfive/camss/stf-video.h @@ -0,0 +1,100 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * stf_video.h + * + * StarFive Camera Subsystem - V4L2 device node + * + * Copyright (C) 2021-2023 StarFive Technology Co., Ltd. + */ + +#ifndef STF_VIDEO_H +#define STF_VIDEO_H + +#include +#include +#include +#include +#include +#include +#include + +#define STFCAMSS_FRAME_MIN_WIDTH 64 +#define STFCAMSS_FRAME_MAX_WIDTH 1920 +#define STFCAMSS_FRAME_MIN_HEIGHT 64 +#define STFCAMSS_FRAME_MAX_HEIGHT 1080 +#define STFCAMSS_FRAME_WIDTH_ALIGN_8 8 +#define STFCAMSS_FRAME_WIDTH_ALIGN_128 128 +#define STFCAMSS_MIN_BUFFERS 2 + +#define STFCAMSS_MAX_ENTITY_NAME_LEN 27 + +enum stf_v_line_id { + STF_V_LINE_WR = 0, + STF_V_LINE_ISP, + STF_V_LINE_MAX, +}; + +enum stf_capture_type { + STF_CAPTURE_RAW = 0, + STF_CAPTURE_YUV, + STF_CAPTURE_NUM, +}; + +struct stfcamss_buffer { + struct vb2_v4l2_buffer vb; + dma_addr_t addr[2]; + struct list_head queue; +}; + +struct fract { + u8 numerator; + u8 denominator; +}; + +/* + * struct stfcamss_format_info - ISP media bus format information + * @code: V4L2 media bus format code + * @pixelformat: V4L2 pixel format FCC identifier + * @planes: Number of planes + * @vsub: Vertical subsampling (for each plane) + * @bpp: Bits per pixel when stored in memory (for each plane) + */ +struct stfcamss_format_info { + u32 code; + u32 pixelformat; + u8 planes; + u8 vsub[3]; + u8 bpp; +}; + +struct stfcamss_video { + struct stfcamss *stfcamss; + struct vb2_queue vb2_q; + struct video_device vdev; + struct media_pad pad; + struct v4l2_format active_fmt; + enum v4l2_buf_type type; + const struct stfcamss_video_ops *ops; + struct mutex lock; /* serialize device access */ + struct mutex q_lock; /* protects the queue */ + unsigned int bpl_alignment; + const struct stfcamss_format_info *formats; + unsigned int nformats; + struct v4l2_subdev *source_subdev; +}; + +struct stfcamss_video_ops { + int (*queue_buffer)(struct stfcamss_video *video, + struct stfcamss_buffer *buf); + int (*flush_buffers)(struct stfcamss_video *video, + enum vb2_buffer_state state); + void (*start_streaming)(struct stfcamss_video *video); + void (*stop_streaming)(struct stfcamss_video *video); +}; + +int stf_video_register(struct stfcamss_video *video, + struct v4l2_device *v4l2_dev, const char *name); + +void stf_video_unregister(struct stfcamss_video *video); + +#endif /* STF_VIDEO_H */