/* * Copyright (c) 2011 - 2012 Samsung Electronics Co., Ltd. * http://www.samsung.com * * Samsung EXYNOS5 SoC series G-Scaler driver * * 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/module.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/bug.h> #include <linux/interrupt.h> #include <linux/workqueue.h> #include <linux/device.h> #include <linux/platform_device.h> #include <linux/list.h> #include <linux/io.h> #include <linux/slab.h> #include <linux/clk.h> #include <media/v4l2-ioctl.h> #include "gsc-core.h" static int gsc_m2m_ctx_stop_req(struct gsc_ctx *ctx) { struct gsc_ctx *curr_ctx; struct gsc_dev *gsc = ctx->gsc_dev; int ret; curr_ctx = v4l2_m2m_get_curr_priv(gsc->m2m.m2m_dev); if (!gsc_m2m_pending(gsc) || (curr_ctx != ctx)) return 0; gsc_ctx_state_lock_set(GSC_CTX_STOP_REQ, ctx); ret = wait_event_timeout(gsc->irq_queue, !gsc_ctx_state_is_set(GSC_CTX_STOP_REQ, ctx), GSC_SHUTDOWN_TIMEOUT); return ret == 0 ? -ETIMEDOUT : ret; } static void __gsc_m2m_job_abort(struct gsc_ctx *ctx) { int ret; ret = gsc_m2m_ctx_stop_req(ctx); if ((ret == -ETIMEDOUT) || (ctx->state & GSC_CTX_ABORT)) { gsc_ctx_state_lock_clear(GSC_CTX_STOP_REQ | GSC_CTX_ABORT, ctx); gsc_m2m_job_finish(ctx, VB2_BUF_STATE_ERROR); } } static int gsc_m2m_start_streaming(struct vb2_queue *q, unsigned int count) { struct gsc_ctx *ctx = q->drv_priv; int ret; ret = pm_runtime_get_sync(&ctx->gsc_dev->pdev->dev); return ret > 0 ? 0 : ret; } static void gsc_m2m_stop_streaming(struct vb2_queue *q) { struct gsc_ctx *ctx = q->drv_priv; __gsc_m2m_job_abort(ctx); pm_runtime_put(&ctx->gsc_dev->pdev->dev); } void gsc_m2m_job_finish(struct gsc_ctx *ctx, int vb_state) { struct vb2_buffer *src_vb, *dst_vb; if (!ctx || !ctx->m2m_ctx) return; src_vb = v4l2_m2m_src_buf_remove(ctx->m2m_ctx); dst_vb = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx); if (src_vb && dst_vb) { dst_vb->v4l2_buf.timestamp = src_vb->v4l2_buf.timestamp; dst_vb->v4l2_buf.timecode = src_vb->v4l2_buf.timecode; dst_vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; dst_vb->v4l2_buf.flags |= src_vb->v4l2_buf.flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; v4l2_m2m_buf_done(src_vb, vb_state); v4l2_m2m_buf_done(dst_vb, vb_state); v4l2_m2m_job_finish(ctx->gsc_dev->m2m.m2m_dev, ctx->m2m_ctx); } } static void gsc_m2m_job_abort(void *priv) { __gsc_m2m_job_abort((struct gsc_ctx *)priv); } static int gsc_get_bufs(struct gsc_ctx *ctx) { struct gsc_frame *s_frame, *d_frame; struct vb2_buffer *src_vb, *dst_vb; int ret; s_frame = &ctx->s_frame; d_frame = &ctx->d_frame; src_vb = v4l2_m2m_next_src_buf(ctx->m2m_ctx); ret = gsc_prepare_addr(ctx, src_vb, s_frame, &s_frame->addr); if (ret) return ret; dst_vb = v4l2_m2m_next_dst_buf(ctx->m2m_ctx); ret = gsc_prepare_addr(ctx, dst_vb, d_frame, &d_frame->addr); if (ret) return ret; dst_vb->v4l2_buf.timestamp = src_vb->v4l2_buf.timestamp; return 0; } static void gsc_m2m_device_run(void *priv) { struct gsc_ctx *ctx = priv; struct gsc_dev *gsc; unsigned long flags; int ret; bool is_set = false; if (WARN(!ctx, "null hardware context\n")) return; gsc = ctx->gsc_dev; spin_lock_irqsave(&gsc->slock, flags); set_bit(ST_M2M_PEND, &gsc->state); /* Reconfigure hardware if the context has changed. */ if (gsc->m2m.ctx != ctx) { pr_debug("gsc->m2m.ctx = 0x%p, current_ctx = 0x%p", gsc->m2m.ctx, ctx); ctx->state |= GSC_PARAMS; gsc->m2m.ctx = ctx; } is_set = ctx->state & GSC_CTX_STOP_REQ; if (is_set) { ctx->state &= ~GSC_CTX_STOP_REQ; ctx->state |= GSC_CTX_ABORT; wake_up(&gsc->irq_queue); goto put_device; } ret = gsc_get_bufs(ctx); if (ret) { pr_err("Wrong address"); goto put_device; } gsc_set_prefbuf(gsc, &ctx->s_frame); gsc_hw_set_input_addr(gsc, &ctx->s_frame.addr, GSC_M2M_BUF_NUM); gsc_hw_set_output_addr(gsc, &ctx->d_frame.addr, GSC_M2M_BUF_NUM); if (ctx->state & GSC_PARAMS) { gsc_hw_set_input_buf_masking(gsc, GSC_M2M_BUF_NUM, false); gsc_hw_set_output_buf_masking(gsc, GSC_M2M_BUF_NUM, false); gsc_hw_set_frm_done_irq_mask(gsc, false); gsc_hw_set_gsc_irq_enable(gsc, true); if (gsc_set_scaler_info(ctx)) { pr_err("Scaler setup error"); goto put_device; } gsc_hw_set_input_path(ctx); gsc_hw_set_in_size(ctx); gsc_hw_set_in_image_format(ctx); gsc_hw_set_output_path(ctx); gsc_hw_set_out_size(ctx); gsc_hw_set_out_image_format(ctx); gsc_hw_set_prescaler(ctx); gsc_hw_set_mainscaler(ctx); gsc_hw_set_rotation(ctx); gsc_hw_set_global_alpha(ctx); } /* update shadow registers */ gsc_hw_set_sfr_update(ctx); ctx->state &= ~GSC_PARAMS; gsc_hw_enable_control(gsc, true); spin_unlock_irqrestore(&gsc->slock, flags); return; put_device: ctx->state &= ~GSC_PARAMS; spin_unlock_irqrestore(&gsc->slock, flags); } static int gsc_m2m_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt, unsigned int *num_buffers, unsigned int *num_planes, unsigned int sizes[], void *allocators[]) { struct gsc_ctx *ctx = vb2_get_drv_priv(vq); struct gsc_frame *frame; int i; frame = ctx_get_frame(ctx, vq->type); if (IS_ERR(frame)) return PTR_ERR(frame); if (!frame->fmt) return -EINVAL; *num_planes = frame->fmt->num_planes; for (i = 0; i < frame->fmt->num_planes; i++) { sizes[i] = frame->payload[i]; allocators[i] = ctx->gsc_dev->alloc_ctx; } return 0; } static int gsc_m2m_buf_prepare(struct vb2_buffer *vb) { struct gsc_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); struct gsc_frame *frame; int i; frame = ctx_get_frame(ctx, vb->vb2_queue->type); if (IS_ERR(frame)) return PTR_ERR(frame); if (!V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) { for (i = 0; i < frame->fmt->num_planes; i++) vb2_set_plane_payload(vb, i, frame->payload[i]); } return 0; } static void gsc_m2m_buf_queue(struct vb2_buffer *vb) { struct gsc_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); pr_debug("ctx: %p, ctx->state: 0x%x", ctx, ctx->state); if (ctx->m2m_ctx) v4l2_m2m_buf_queue(ctx->m2m_ctx, vb); } static struct vb2_ops gsc_m2m_qops = { .queue_setup = gsc_m2m_queue_setup, .buf_prepare = gsc_m2m_buf_prepare, .buf_queue = gsc_m2m_buf_queue, .wait_prepare = gsc_unlock, .wait_finish = gsc_lock, .stop_streaming = gsc_m2m_stop_streaming, .start_streaming = gsc_m2m_start_streaming, }; static int gsc_m2m_querycap(struct file *file, void *fh, struct v4l2_capability *cap) { struct gsc_ctx *ctx = fh_to_ctx(fh); struct gsc_dev *gsc = ctx->gsc_dev; strlcpy(cap->driver, gsc->pdev->name, sizeof(cap->driver)); strlcpy(cap->card, gsc->pdev->name, sizeof(cap->card)); strlcpy(cap->bus_info, "platform", sizeof(cap->bus_info)); cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_VIDEO_OUTPUT_MPLANE; cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; return 0; } static int gsc_m2m_enum_fmt_mplane(struct file *file, void *priv, struct v4l2_fmtdesc *f) { return gsc_enum_fmt_mplane(f); } static int gsc_m2m_g_fmt_mplane(struct file *file, void *fh, struct v4l2_format *f) { struct gsc_ctx *ctx = fh_to_ctx(fh); return gsc_g_fmt_mplane(ctx, f); } static int gsc_m2m_try_fmt_mplane(struct file *file, void *fh, struct v4l2_format *f) { struct gsc_ctx *ctx = fh_to_ctx(fh); return gsc_try_fmt_mplane(ctx, f); } static int gsc_m2m_s_fmt_mplane(struct file *file, void *fh, struct v4l2_format *f) { struct gsc_ctx *ctx = fh_to_ctx(fh); struct vb2_queue *vq; struct gsc_frame *frame; struct v4l2_pix_format_mplane *pix; int i, ret = 0; ret = gsc_m2m_try_fmt_mplane(file, fh, f); if (ret) return ret; vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type); if (vb2_is_streaming(vq)) { pr_err("queue (%d) busy", f->type); return -EBUSY; } if (V4L2_TYPE_IS_OUTPUT(f->type)) frame = &ctx->s_frame; else frame = &ctx->d_frame; pix = &f->fmt.pix_mp; frame->fmt = find_fmt(&pix->pixelformat, NULL, 0); frame->colorspace = pix->colorspace; if (!frame->fmt) return -EINVAL; for (i = 0; i < frame->fmt->num_planes; i++) frame->payload[i] = pix->plane_fmt[i].sizeimage; gsc_set_frame_size(frame, pix->width, pix->height); if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) gsc_ctx_state_lock_set(GSC_PARAMS | GSC_DST_FMT, ctx); else gsc_ctx_state_lock_set(GSC_PARAMS | GSC_SRC_FMT, ctx); pr_debug("f_w: %d, f_h: %d", frame->f_width, frame->f_height); return 0; } static int gsc_m2m_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *reqbufs) { struct gsc_ctx *ctx = fh_to_ctx(fh); struct gsc_dev *gsc = ctx->gsc_dev; u32 max_cnt; max_cnt = (reqbufs->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) ? gsc->variant->in_buf_cnt : gsc->variant->out_buf_cnt; if (reqbufs->count > max_cnt) { return -EINVAL; } else if (reqbufs->count == 0) { if (reqbufs->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) gsc_ctx_state_lock_clear(GSC_SRC_FMT, ctx); else gsc_ctx_state_lock_clear(GSC_DST_FMT, ctx); } return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs); } static int gsc_m2m_expbuf(struct file *file, void *fh, struct v4l2_exportbuffer *eb) { struct gsc_ctx *ctx = fh_to_ctx(fh); return v4l2_m2m_expbuf(file, ctx->m2m_ctx, eb); } static int gsc_m2m_querybuf(struct file *file, void *fh, struct v4l2_buffer *buf) { struct gsc_ctx *ctx = fh_to_ctx(fh); return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf); } static int gsc_m2m_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf) { struct gsc_ctx *ctx = fh_to_ctx(fh); return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf); } static int gsc_m2m_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf) { struct gsc_ctx *ctx = fh_to_ctx(fh); return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf); } static int gsc_m2m_streamon(struct file *file, void *fh, enum v4l2_buf_type type) { struct gsc_ctx *ctx = fh_to_ctx(fh); /* The source and target color format need to be set */ if (V4L2_TYPE_IS_OUTPUT(type)) { if (!gsc_ctx_state_is_set(GSC_SRC_FMT, ctx)) return -EINVAL; } else if (!gsc_ctx_state_is_set(GSC_DST_FMT, ctx)) { return -EINVAL; } return v4l2_m2m_streamon(file, ctx->m2m_ctx, type); } static int gsc_m2m_streamoff(struct file *file, void *fh, enum v4l2_buf_type type) { struct gsc_ctx *ctx = fh_to_ctx(fh); return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type); } /* Return 1 if rectangle a is enclosed in rectangle b, or 0 otherwise. */ static int is_rectangle_enclosed(struct v4l2_rect *a, struct v4l2_rect *b) { if (a->left < b->left || a->top < b->top) return 0; if (a->left + a->width > b->left + b->width) return 0; if (a->top + a->height > b->top + b->height) return 0; return 1; } static int gsc_m2m_g_selection(struct file *file, void *fh, struct v4l2_selection *s) { struct gsc_frame *frame; struct gsc_ctx *ctx = fh_to_ctx(fh); if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) && (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)) return -EINVAL; frame = ctx_get_frame(ctx, s->type); if (IS_ERR(frame)) return PTR_ERR(frame); switch (s->target) { case V4L2_SEL_TGT_COMPOSE_DEFAULT: case V4L2_SEL_TGT_COMPOSE_BOUNDS: case V4L2_SEL_TGT_CROP_BOUNDS: case V4L2_SEL_TGT_CROP_DEFAULT: s->r.left = 0; s->r.top = 0; s->r.width = frame->f_width; s->r.height = frame->f_height; return 0; case V4L2_SEL_TGT_COMPOSE: case V4L2_SEL_TGT_CROP: s->r.left = frame->crop.left; s->r.top = frame->crop.top; s->r.width = frame->crop.width; s->r.height = frame->crop.height; return 0; } return -EINVAL; } static int gsc_m2m_s_selection(struct file *file, void *fh, struct v4l2_selection *s) { struct gsc_frame *frame; struct gsc_ctx *ctx = fh_to_ctx(fh); struct v4l2_crop cr; struct gsc_variant *variant = ctx->gsc_dev->variant; int ret; cr.type = s->type; cr.c = s->r; if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) && (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)) return -EINVAL; ret = gsc_try_crop(ctx, &cr); if (ret) return ret; if (s->flags & V4L2_SEL_FLAG_LE && !is_rectangle_enclosed(&cr.c, &s->r)) return -ERANGE; if (s->flags & V4L2_SEL_FLAG_GE && !is_rectangle_enclosed(&s->r, &cr.c)) return -ERANGE; s->r = cr.c; switch (s->target) { case V4L2_SEL_TGT_COMPOSE_BOUNDS: case V4L2_SEL_TGT_COMPOSE_DEFAULT: case V4L2_SEL_TGT_COMPOSE: frame = &ctx->s_frame; break; case V4L2_SEL_TGT_CROP_BOUNDS: case V4L2_SEL_TGT_CROP: case V4L2_SEL_TGT_CROP_DEFAULT: frame = &ctx->d_frame; break; default: return -EINVAL; } /* Check to see if scaling ratio is within supported range */ if (gsc_ctx_state_is_set(GSC_DST_FMT | GSC_SRC_FMT, ctx)) { if (s->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) { ret = gsc_check_scaler_ratio(variant, cr.c.width, cr.c.height, ctx->d_frame.crop.width, ctx->d_frame.crop.height, ctx->gsc_ctrls.rotate->val, ctx->out_path); } else { ret = gsc_check_scaler_ratio(variant, ctx->s_frame.crop.width, ctx->s_frame.crop.height, cr.c.width, cr.c.height, ctx->gsc_ctrls.rotate->val, ctx->out_path); } if (ret) { pr_err("Out of scaler range"); return -EINVAL; } } frame->crop = cr.c; gsc_ctx_state_lock_set(GSC_PARAMS, ctx); return 0; } static const struct v4l2_ioctl_ops gsc_m2m_ioctl_ops = { .vidioc_querycap = gsc_m2m_querycap, .vidioc_enum_fmt_vid_cap_mplane = gsc_m2m_enum_fmt_mplane, .vidioc_enum_fmt_vid_out_mplane = gsc_m2m_enum_fmt_mplane, .vidioc_g_fmt_vid_cap_mplane = gsc_m2m_g_fmt_mplane, .vidioc_g_fmt_vid_out_mplane = gsc_m2m_g_fmt_mplane, .vidioc_try_fmt_vid_cap_mplane = gsc_m2m_try_fmt_mplane, .vidioc_try_fmt_vid_out_mplane = gsc_m2m_try_fmt_mplane, .vidioc_s_fmt_vid_cap_mplane = gsc_m2m_s_fmt_mplane, .vidioc_s_fmt_vid_out_mplane = gsc_m2m_s_fmt_mplane, .vidioc_reqbufs = gsc_m2m_reqbufs, .vidioc_expbuf = gsc_m2m_expbuf, .vidioc_querybuf = gsc_m2m_querybuf, .vidioc_qbuf = gsc_m2m_qbuf, .vidioc_dqbuf = gsc_m2m_dqbuf, .vidioc_streamon = gsc_m2m_streamon, .vidioc_streamoff = gsc_m2m_streamoff, .vidioc_g_selection = gsc_m2m_g_selection, .vidioc_s_selection = gsc_m2m_s_selection }; static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq) { struct gsc_ctx *ctx = priv; int ret; memset(src_vq, 0, sizeof(*src_vq)); src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE; src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF; src_vq->drv_priv = ctx; src_vq->ops = &gsc_m2m_qops; src_vq->mem_ops = &vb2_dma_contig_memops; src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer); src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; ret = vb2_queue_init(src_vq); if (ret) return ret; memset(dst_vq, 0, sizeof(*dst_vq)); dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE; dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF; dst_vq->drv_priv = ctx; dst_vq->ops = &gsc_m2m_qops; dst_vq->mem_ops = &vb2_dma_contig_memops; dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer); dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; return vb2_queue_init(dst_vq); } static int gsc_m2m_open(struct file *file) { struct gsc_dev *gsc = video_drvdata(file); struct gsc_ctx *ctx = NULL; int ret; pr_debug("pid: %d, state: 0x%lx", task_pid_nr(current), gsc->state); if (mutex_lock_interruptible(&gsc->lock)) return -ERESTARTSYS; ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); if (!ctx) { ret = -ENOMEM; goto unlock; } v4l2_fh_init(&ctx->fh, gsc->m2m.vfd); ret = gsc_ctrls_create(ctx); if (ret) goto error_fh; /* Use separate control handler per file handle */ ctx->fh.ctrl_handler = &ctx->ctrl_handler; file->private_data = &ctx->fh; v4l2_fh_add(&ctx->fh); ctx->gsc_dev = gsc; /* Default color format */ ctx->s_frame.fmt = get_format(0); ctx->d_frame.fmt = get_format(0); /* Setup the device context for mem2mem mode. */ ctx->state = GSC_CTX_M2M; ctx->flags = 0; ctx->in_path = GSC_DMA; ctx->out_path = GSC_DMA; ctx->m2m_ctx = v4l2_m2m_ctx_init(gsc->m2m.m2m_dev, ctx, queue_init); if (IS_ERR(ctx->m2m_ctx)) { pr_err("Failed to initialize m2m context"); ret = PTR_ERR(ctx->m2m_ctx); goto error_ctrls; } if (gsc->m2m.refcnt++ == 0) set_bit(ST_M2M_OPEN, &gsc->state); pr_debug("gsc m2m driver is opened, ctx(0x%p)", ctx); mutex_unlock(&gsc->lock); return 0; error_ctrls: gsc_ctrls_delete(ctx); error_fh: v4l2_fh_del(&ctx->fh); v4l2_fh_exit(&ctx->fh); kfree(ctx); unlock: mutex_unlock(&gsc->lock); return ret; } static int gsc_m2m_release(struct file *file) { struct gsc_ctx *ctx = fh_to_ctx(file->private_data); struct gsc_dev *gsc = ctx->gsc_dev; pr_debug("pid: %d, state: 0x%lx, refcnt= %d", task_pid_nr(current), gsc->state, gsc->m2m.refcnt); mutex_lock(&gsc->lock); v4l2_m2m_ctx_release(ctx->m2m_ctx); gsc_ctrls_delete(ctx); v4l2_fh_del(&ctx->fh); v4l2_fh_exit(&ctx->fh); if (--gsc->m2m.refcnt <= 0) clear_bit(ST_M2M_OPEN, &gsc->state); kfree(ctx); mutex_unlock(&gsc->lock); return 0; } static unsigned int gsc_m2m_poll(struct file *file, struct poll_table_struct *wait) { struct gsc_ctx *ctx = fh_to_ctx(file->private_data); struct gsc_dev *gsc = ctx->gsc_dev; int ret; if (mutex_lock_interruptible(&gsc->lock)) return -ERESTARTSYS; ret = v4l2_m2m_poll(file, ctx->m2m_ctx, wait); mutex_unlock(&gsc->lock); return ret; } static int gsc_m2m_mmap(struct file *file, struct vm_area_struct *vma) { struct gsc_ctx *ctx = fh_to_ctx(file->private_data); struct gsc_dev *gsc = ctx->gsc_dev; int ret; if (mutex_lock_interruptible(&gsc->lock)) return -ERESTARTSYS; ret = v4l2_m2m_mmap(file, ctx->m2m_ctx, vma); mutex_unlock(&gsc->lock); return ret; } static const struct v4l2_file_operations gsc_m2m_fops = { .owner = THIS_MODULE, .open = gsc_m2m_open, .release = gsc_m2m_release, .poll = gsc_m2m_poll, .unlocked_ioctl = video_ioctl2, .mmap = gsc_m2m_mmap, }; static struct v4l2_m2m_ops gsc_m2m_ops = { .device_run = gsc_m2m_device_run, .job_abort = gsc_m2m_job_abort, }; int gsc_register_m2m_device(struct gsc_dev *gsc) { struct platform_device *pdev; int ret; if (!gsc) return -ENODEV; pdev = gsc->pdev; gsc->vdev.fops = &gsc_m2m_fops; gsc->vdev.ioctl_ops = &gsc_m2m_ioctl_ops; gsc->vdev.release = video_device_release_empty; gsc->vdev.lock = &gsc->lock; gsc->vdev.vfl_dir = VFL_DIR_M2M; gsc->vdev.v4l2_dev = &gsc->v4l2_dev; snprintf(gsc->vdev.name, sizeof(gsc->vdev.name), "%s.%d:m2m", GSC_MODULE_NAME, gsc->id); video_set_drvdata(&gsc->vdev, gsc); gsc->m2m.vfd = &gsc->vdev; gsc->m2m.m2m_dev = v4l2_m2m_init(&gsc_m2m_ops); if (IS_ERR(gsc->m2m.m2m_dev)) { dev_err(&pdev->dev, "failed to initialize v4l2-m2m device\n"); ret = PTR_ERR(gsc->m2m.m2m_dev); goto err_m2m_r1; } ret = video_register_device(&gsc->vdev, VFL_TYPE_GRABBER, -1); if (ret) { dev_err(&pdev->dev, "%s(): failed to register video device\n", __func__); goto err_m2m_r2; } pr_debug("gsc m2m driver registered as /dev/video%d", gsc->vdev.num); return 0; err_m2m_r2: v4l2_m2m_release(gsc->m2m.m2m_dev); err_m2m_r1: video_device_release(gsc->m2m.vfd); return ret; } void gsc_unregister_m2m_device(struct gsc_dev *gsc) { if (gsc) v4l2_m2m_release(gsc->m2m.m2m_dev); }