text: // SPDX-License-Identifier: GPL-2.0
  /*
   * Copyright (C) STMicroelectronics SA 2014
   * Authors: Fabien Dessenne <fabien.dessenne@st.com> for STMicroelectronics.
   */
  
  #include <linux/errno.h>
  #include <linux/interrupt.h>
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/of.h>
  #include <linux/pm_runtime.h>
  #include <linux/slab.h>
  
  #include <media/v4l2-event.h>
  #include <media/v4l2-ioctl.h>
  
  #include "bdisp.h"
  
  #define BDISP_MAX_CTRL_NUM      10
  
  #define BDISP_WORK_TIMEOUT      ((100 * HZ) / 1000)
  
  /* User configuration change */
  #define BDISP_PARAMS            BIT(0) /* Config updated */
  #define BDISP_SRC_FMT           BIT(1) /* Source set */
  #define BDISP_DST_FMT           BIT(2) /* Destination set */
  #define BDISP_CTX_STOP_REQ      BIT(3) /* Stop request */
  #define BDISP_CTX_ABORT         BIT(4) /* Abort while device run */
  
  #define BDISP_MIN_W             1
  #define BDISP_MAX_W             8191
  #define BDISP_MIN_H             1
  #define BDISP_MAX_H             8191
  
  #define fh_to_ctx(__fh) container_of(__fh, struct bdisp_ctx, fh)
  
  enum bdisp_dev_flags {
  	ST_M2M_OPEN,            /* Driver opened */
  	ST_M2M_RUNNING,         /* HW device running */
  	ST_M2M_SUSPENDED,       /* Driver suspended */
  	ST_M2M_SUSPENDING,      /* Driver being suspended */
  };
  
  static const struct bdisp_fmt bdisp_formats[] = {
  	/* ARGB888. [31:0] A:R:G:B 8:8:8:8 little endian */
  	{
  		.pixelformat    = V4L2_PIX_FMT_ABGR32, /* is actually ARGB */
  		.nb_planes      = 1,
  		.bpp            = 32,
  		.bpp_plane0     = 32,
  		.w_align        = 1,
  		.h_align        = 1
  	},
  	/* XRGB888. [31:0] x:R:G:B 8:8:8:8 little endian */
  	{
  		.pixelformat    = V4L2_PIX_FMT_XBGR32, /* is actually xRGB */
  		.nb_planes      = 1,
  		.bpp            = 32,
  		.bpp_plane0     = 32,
  		.w_align        = 1,
  		.h_align        = 1
  	},
  	/* RGB565. [15:0] R:G:B 5:6:5 little endian */
  	{
  		.pixelformat    = V4L2_PIX_FMT_RGB565,
  		.nb_planes      = 1,
  		.bpp            = 16,
  		.bpp_plane0     = 16,
  		.w_align        = 1,
  		.h_align        = 1
  	},
  	/* NV12. YUV420SP - 1 plane for Y + 1 plane for (CbCr) */
  	{
  		.pixelformat    = V4L2_PIX_FMT_NV12,
  		.nb_planes      = 2,
  		.bpp            = 12,
  		.bpp_plane0     = 8,
  		.w_align        = 2,
  		.h_align        = 2
  	},
  	/* RGB888. [23:0] B:G:R 8:8:8 little endian */
  	{
  		.pixelformat    = V4L2_PIX_FMT_RGB24,
  		.nb_planes      = 1,
  		.bpp            = 24,
  		.bpp_plane0     = 24,
  		.w_align        = 1,
  		.h_align        = 1
  	},
  	/* YU12. YUV420P - 1 plane for Y + 1 plane for Cb + 1 plane for Cr
  	 * To keep as the LAST element of this table (no support on capture)
  	 */
  	{
  		.pixelformat    = V4L2_PIX_FMT_YUV420,
  		.nb_planes      = 3,
  		.bpp            = 12,
  		.bpp_plane0     = 8,
  		.w_align        = 2,
  		.h_align        = 2
  	}
  };
  
  /* Default format : HD ARGB32*/
  #define BDISP_DEF_WIDTH         1920
  #define BDISP_DEF_HEIGHT        1080
  
  static const struct bdisp_frame bdisp_dflt_fmt = {
  		.width          = BDISP_DEF_WIDTH,
  		.height         = BDISP_DEF_HEIGHT,
  		.fmt            = &bdisp_formats[0],
  		.field          = V4L2_FIELD_NONE,
  		.bytesperline   = BDISP_DEF_WIDTH * 4,
  		.sizeimage      = BDISP_DEF_WIDTH * BDISP_DEF_HEIGHT * 4,
  		.colorspace     = V4L2_COLORSPACE_REC709,
  		.crop           = {0, 0, BDISP_DEF_WIDTH, BDISP_DEF_HEIGHT},
  		.paddr          = {0, 0, 0, 0}
  };
  
  static inline void bdisp_ctx_state_lock_set(u32 state, struct bdisp_ctx *ctx)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&ctx->bdisp_dev->slock, flags);
  	ctx->state |= state;
  	spin_unlock_irqrestore(&ctx->bdisp_dev->slock, flags);
  }
  
  static inline void bdisp_ctx_state_lock_clear(u32 state, struct bdisp_ctx *ctx)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&ctx->bdisp_dev->slock, flags);
  	ctx->state &= ~state;
  	spin_unlock_irqrestore(&ctx->bdisp_dev->slock, flags);
  }
  
  static inline bool bdisp_ctx_state_is_set(u32 mask, struct bdisp_ctx *ctx)
  {
  	unsigned long flags;
  	bool ret;
  
  	spin_lock_irqsave(&ctx->bdisp_dev->slock, flags);
  	ret = (ctx->state & mask) == mask;
  	spin_unlock_irqrestore(&ctx->bdisp_dev->slock, flags);
  
  	return ret;
  }
  
  static const struct bdisp_fmt *bdisp_find_fmt(u32 pixelformat)
  {
  	const struct bdisp_fmt *fmt;
  	unsigned int i;
  
  	for (i = 0; i < ARRAY_SIZE(bdisp_formats); i++) {
  		fmt = &bdisp_formats[i];
  		if (fmt->pixelformat == pixelformat)
  			return fmt;
  	}
  
  	return NULL;
  }
  
  static struct bdisp_frame *ctx_get_frame(struct bdisp_ctx *ctx,
  					 enum v4l2_buf_type type)
  {
  	switch (type) {
  	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
  		return &ctx->src;
  	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
  		return &ctx->dst;
  	default:
  		dev_err(ctx->bdisp_dev->dev,
  			"Wrong buffer/video queue type (%d)\n", type);
  		break;
  	}
  
  	return ERR_PTR(-EINVAL);
  }
  
  static void bdisp_job_finish(struct bdisp_ctx *ctx, int vb_state)
  {
  	struct vb2_v4l2_buffer *src_vb, *dst_vb;
  
  	if (WARN(!ctx || !ctx->fh.m2m_ctx, "Null hardware context\n"))
  		return;
  
  	dev_dbg(ctx->bdisp_dev->dev, "%s\n", __func__);
  
  	src_vb = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
  	dst_vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
  
  	if (src_vb && dst_vb) {
  		dst_vb->vb2_buf.timestamp = src_vb->vb2_buf.timestamp;
  		dst_vb->timecode = src_vb->timecode;
  		dst_vb->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
  		dst_vb->flags |= src_vb->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->bdisp_dev->m2m.m2m_dev,
  				    ctx->fh.m2m_ctx);
  	}
  }
  
  static int bdisp_ctx_stop_req(struct bdisp_ctx *ctx)
  {
  	struct bdisp_ctx *curr_ctx;
  	struct bdisp_dev *bdisp = ctx->bdisp_dev;
  	int ret;
  
  	dev_dbg(ctx->bdisp_dev->dev, "%s\n", __func__);
  
  	cancel_delayed_work(&bdisp->timeout_work);
  
  	curr_ctx = v4l2_m2m_get_curr_priv(bdisp->m2m.m2m_dev);
  	if (!test_bit(ST_M2M_RUNNING, &bdisp->state) || (curr_ctx != ctx))
  		return 0;
  
  	bdisp_ctx_state_lock_set(BDISP_CTX_STOP_REQ, ctx);
  
  	ret = wait_event_timeout(bdisp->irq_queue,
  			!bdisp_ctx_state_is_set(BDISP_CTX_STOP_REQ, ctx),
  			BDISP_WORK_TIMEOUT);
  
  	if (!ret) {
  		dev_err(ctx->bdisp_dev->dev, "%s IRQ timeout\n", __func__);
  		return -ETIMEDOUT;
  	}
  
  	return 0;
  }
  
  static void __bdisp_job_abort(struct bdisp_ctx *ctx)
  {
  	int ret;
  
  	ret = bdisp_ctx_stop_req(ctx);
  	if ((ret == -ETIMEDOUT) || (ctx->state & BDISP_CTX_ABORT)) {
  		bdisp_ctx_state_lock_clear(BDISP_CTX_STOP_REQ | BDISP_CTX_ABORT,
  					   ctx);
  		bdisp_job_finish(ctx, VB2_BUF_STATE_ERROR);
  	}
  }
  
  static void bdisp_job_abort(void *priv)
  {
  	__bdisp_job_abort((struct bdisp_ctx *)priv);
  }
  
  static int bdisp_get_addr(struct bdisp_ctx *ctx, struct vb2_buffer *vb,
  			  struct bdisp_frame *frame, dma_addr_t *paddr)
  {
  	if (!vb || !frame)
  		return -EINVAL;
  
  	paddr[0] = vb2_dma_contig_plane_dma_addr(vb, 0);
  
  	if (frame->fmt->nb_planes > 1)
  		/* UV (NV12) or U (420P) */
  		paddr[1] = (dma_addr_t)(paddr[0] +
  				frame->bytesperline * frame->height);
  
  	if (frame->fmt->nb_planes > 2)
  		/* V (420P) */
  		paddr[2] = (dma_addr_t)(paddr[1] +
  				(frame->bytesperline * frame->height) / 4);
  
  	if (frame->fmt->nb_planes > 3)
  		dev_dbg(ctx->bdisp_dev->dev, "ignoring some planes\n");
  
  	dev_dbg(ctx->bdisp_dev->dev,
  		"%s plane[0]=%pad plane[1]=%pad plane[2]=%pad\n",
  		__func__, &paddr[0], &paddr[1], &paddr[2]);
  
  	return 0;
  }
  
  static int bdisp_get_bufs(struct bdisp_ctx *ctx)
  {
  	struct bdisp_frame *src, *dst;
  	struct vb2_v4l2_buffer *src_vb, *dst_vb;
  	int ret;
  
  	src = &ctx->src;
  	dst = &ctx->dst;
  
  	src_vb = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  	ret = bdisp_get_addr(ctx, &src_vb->vb2_buf, src, src->paddr);
  	if (ret)
  		return ret;
  
  	dst_vb = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
  	ret = bdisp_get_addr(ctx, &dst_vb->vb2_buf, dst, dst->paddr);
  	if (ret)
  		return ret;
  
  	dst_vb->vb2_buf.timestamp = src_vb->vb2_buf.timestamp;
  
  	return 0;
  }
  
  static void bdisp_device_run(void *priv)
  {
  	struct bdisp_ctx *ctx = priv;
  	struct bdisp_dev *bdisp;
  	unsigned long flags;
  	int err = 0;
  
  	if (WARN(!ctx, "Null hardware context\n"))
  		return;
  
  	bdisp = ctx->bdisp_dev;
  	dev_dbg(bdisp->dev, "%s\n", __func__);
  	spin_lock_irqsave(&bdisp->slock, flags);
  
  	if (bdisp->m2m.ctx != ctx) {
  		dev_dbg(bdisp->dev, "ctx updated: %p -> %p\n",
  			bdisp->m2m.ctx, ctx);
  		ctx->state |= BDISP_PARAMS;
  		bdisp->m2m.ctx = ctx;
  	}
  
  	if (ctx->state & BDISP_CTX_STOP_REQ) {
  		ctx->state &= ~BDISP_CTX_STOP_REQ;
  		ctx->state |= BDISP_CTX_ABORT;
  		wake_up(&bdisp->irq_queue);
  		goto out;
  	}
  
  	err = bdisp_get_bufs(ctx);
  	if (err) {
  		dev_err(bdisp->dev, "cannot get address\n");
  		goto out;
  	}
  
  	bdisp_dbg_perf_begin(bdisp);
  
  	err = bdisp_hw_reset(bdisp);
  	if (err) {
  		dev_err(bdisp->dev, "could not get HW ready\n");
  		goto out;
  	}
  
  	err = bdisp_hw_update(ctx);
  	if (err) {
  		dev_err(bdisp->dev, "could not send HW request\n");
  		goto out;
  	}
  
  	queue_delayed_work(bdisp->work_queue, &bdisp->timeout_work,
  			   BDISP_WORK_TIMEOUT);
  	set_bit(ST_M2M_RUNNING, &bdisp->state);
  out:
  	ctx->state &= ~BDISP_PARAMS;
  	spin_unlock_irqrestore(&bdisp->slock, flags);
  	if (err)
  		bdisp_job_finish(ctx, VB2_BUF_STATE_ERROR);
  }
  
  static const struct v4l2_m2m_ops bdisp_m2m_ops = {
  	.device_run     = bdisp_device_run,
  	.job_abort      = bdisp_job_abort,
  };
  
  static int __bdisp_s_ctrl(struct bdisp_ctx *ctx, struct v4l2_ctrl *ctrl)
  {
  	if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
  		return 0;
  
  	switch (ctrl->id) {
  	case V4L2_CID_HFLIP:
  		ctx->hflip = ctrl->val;
  		break;
  	case V4L2_CID_VFLIP:
  		ctx->vflip = ctrl->val;
  		break;
  	default:
  		dev_err(ctx->bdisp_dev->dev, "unknown control %d\n", ctrl->id);
  		return -EINVAL;
  	}
  
  	ctx->state |= BDISP_PARAMS;
  
  	return 0;
  }
  
  static int bdisp_s_ctrl(struct v4l2_ctrl *ctrl)
  {
  	struct bdisp_ctx *ctx = container_of(ctrl->handler, struct bdisp_ctx,
  						ctrl_handler);
  	unsigned long flags;
  	int ret;
  
  	spin_lock_irqsave(&ctx->bdisp_dev->slock, flags);
  	ret = __bdisp_s_ctrl(ctx, ctrl);
  	spin_unlock_irqrestore(&ctx->bdisp_dev->slock, flags);
  
  	return ret;
  }
  
  static const struct v4l2_ctrl_ops bdisp_c_ops = {
  	.s_ctrl = bdisp_s_ctrl,
  };
  
  static int bdisp_ctrls_create(struct bdisp_ctx *ctx)
  {
  	if (ctx->ctrls_rdy)
  		return 0;
  
  	v4l2_ctrl_handler_init(&ctx->ctrl_handler, BDISP_MAX_CTRL_NUM);
  
  	ctx->bdisp_ctrls.hflip = v4l2_ctrl_new_std(&ctx->ctrl_handler,
  				&bdisp_c_ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
  	ctx->bdisp_ctrls.vflip = v4l2_ctrl_new_std(&ctx->ctrl_handler,
  				&bdisp_c_ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
  
  	if (ctx->ctrl_handler.error) {
  		int err = ctx->ctrl_handler.error;
  
  		v4l2_ctrl_handler_free(&ctx->ctrl_handler);
  		return err;
  	}
  
  	ctx->ctrls_rdy = true;
  
  	return 0;
  }
  
  static void bdisp_ctrls_delete(struct bdisp_ctx *ctx)
  {
  	if (ctx->ctrls_rdy) {
  		v4l2_ctrl_handler_free(&ctx->ctrl_handler);
  		ctx->ctrls_rdy = false;
  	}
  }
  
  static int bdisp_queue_setup(struct vb2_queue *vq,
  			     unsigned int *nb_buf, unsigned int *nb_planes,
  			     unsigned int sizes[], struct device *alloc_devs[])
  {
  	struct bdisp_ctx *ctx = vb2_get_drv_priv(vq);
  	struct bdisp_frame *frame = ctx_get_frame(ctx, vq->type);
  
  	if (IS_ERR(frame)) {
  		dev_err(ctx->bdisp_dev->dev, "Invalid frame (%p)\n", frame);
  		return PTR_ERR(frame);
  	}
  
  	if (!frame->fmt) {
  		dev_err(ctx->bdisp_dev->dev, "Invalid format\n");
  		return -EINVAL;
  	}
  
  	if (*nb_planes)
  		return sizes[0] < frame->sizeimage ? -EINVAL : 0;
  
  	*nb_planes = 1;
  	sizes[0] = frame->sizeimage;
  
  	return 0;
  }
  
  static int bdisp_buf_prepare(struct vb2_buffer *vb)
  {
  	struct bdisp_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  	struct bdisp_frame *frame = ctx_get_frame(ctx, vb->vb2_queue->type);
  
  	if (IS_ERR(frame)) {
  		dev_err(ctx->bdisp_dev->dev, "Invalid frame (%p)\n", frame);
  		return PTR_ERR(frame);
  	}
  
  	if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
  		vb2_set_plane_payload(vb, 0, frame->sizeimage);
  
  	return 0;
  }
  
  static void bdisp_buf_queue(struct vb2_buffer *vb)
  {
  	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  	struct bdisp_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  
  	/* return to V4L2 any 0-size buffer so it can be dequeued by user */
  	if (!vb2_get_plane_payload(vb, 0)) {
  		dev_dbg(ctx->bdisp_dev->dev, "0 data buffer, skip it\n");
  		vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
  		return;
  	}
  
  	if (ctx->fh.m2m_ctx)
  		v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
  }
  
  static int bdisp_start_streaming(struct vb2_queue *q, unsigned int count)
  {
  	struct bdisp_ctx *ctx = q->drv_priv;
  	struct vb2_v4l2_buffer *buf;
  	int ret = pm_runtime_get_sync(ctx->bdisp_dev->dev);
  
  	if (ret < 0) {
  		dev_err(ctx->bdisp_dev->dev, "failed to set runtime PM\n");
  
  		if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
  			while ((buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx)))
  				v4l2_m2m_buf_done(buf, VB2_BUF_STATE_QUEUED);
  		} else {
  			while ((buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx)))
  				v4l2_m2m_buf_done(buf, VB2_BUF_STATE_QUEUED);
  		}
  
  		return ret;
  	}
  
  	return 0;
  }
  
  static void bdisp_stop_streaming(struct vb2_queue *q)
  {
  	struct bdisp_ctx *ctx = q->drv_priv;
  
  	__bdisp_job_abort(ctx);
  
  	pm_runtime_put(ctx->bdisp_dev->dev);
  }
  
  static const struct vb2_ops bdisp_qops = {
  	.queue_setup     = bdisp_queue_setup,
  	.buf_prepare     = bdisp_buf_prepare,
  	.buf_queue       = bdisp_buf_queue,
  	.wait_prepare    = vb2_ops_wait_prepare,
  	.wait_finish     = vb2_ops_wait_finish,
  	.stop_streaming  = bdisp_stop_streaming,
  	.start_streaming = bdisp_start_streaming,
  };
  
  static int queue_init(void *priv,
  		      struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
  {
  	struct bdisp_ctx *ctx = priv;
  	int ret;
  
  	memset(src_vq, 0, sizeof(*src_vq));
  	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
  	src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
  	src_vq->drv_priv = ctx;
  	src_vq->ops = &bdisp_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;
  	src_vq->lock = &ctx->bdisp_dev->lock;
  	src_vq->dev = ctx->bdisp_dev->v4l2_dev.dev;
  
  	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;
  	dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
  	dst_vq->drv_priv = ctx;
  	dst_vq->ops = &bdisp_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;
  	dst_vq->lock = &ctx->bdisp_dev->lock;
  	dst_vq->dev = ctx->bdisp_dev->v4l2_dev.dev;
  
  	return vb2_queue_init(dst_vq);
  }
  
  static int bdisp_open(struct file *file)
  {
  	struct bdisp_dev *bdisp = video_drvdata(file);
  	struct bdisp_ctx *ctx = NULL;
  	int ret;
  
  	if (mutex_lock_interruptible(&bdisp->lock))
  		return -ERESTARTSYS;
  
  	/* Allocate memory for both context and node */
  	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
  	if (!ctx) {
  		ret = -ENOMEM;
  		goto unlock;
  	}
  	ctx->bdisp_dev = bdisp;
  
  	if (bdisp_hw_alloc_nodes(ctx)) {
  		dev_err(bdisp->dev, "no memory for nodes\n");
  		ret = -ENOMEM;
  		goto mem_ctx;
  	}
  
  	v4l2_fh_init(&ctx->fh, bdisp->m2m.vdev);
  
  	ret = bdisp_ctrls_create(ctx);
  	if (ret) {
  		dev_err(bdisp->dev, "Failed to create control\n");
  		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);
  
  	/* Default format */
  	ctx->src = bdisp_dflt_fmt;
  	ctx->dst = bdisp_dflt_fmt;
  
  	/* Setup the device context for mem2mem mode. */
  	ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(bdisp->m2m.m2m_dev, ctx,
  					    queue_init);
  	if (IS_ERR(ctx->fh.m2m_ctx)) {
  		dev_err(bdisp->dev, "Failed to initialize m2m context\n");
  		ret = PTR_ERR(ctx->fh.m2m_ctx);
  		goto error_ctrls;
  	}
  
  	bdisp->m2m.refcnt++;
  	set_bit(ST_M2M_OPEN, &bdisp->state);
  
  	dev_dbg(bdisp->dev, "driver opened, ctx = 0x%p\n", ctx);
  
  	mutex_unlock(&bdisp->lock);
  
  	return 0;
  
  error_ctrls:
  	bdisp_ctrls_delete(ctx);
  	v4l2_fh_del(&ctx->fh);
  error_fh:
  	v4l2_fh_exit(&ctx->fh);
  	bdisp_hw_free_nodes(ctx);
  mem_ctx:
  	kfree(ctx);
  unlock:
  	mutex_unlock(&bdisp->lock);
  
  	return ret;
  }
  
  static int bdisp_release(struct file *file)
  {
  	struct bdisp_ctx *ctx = fh_to_ctx(file->private_data);
  	struct bdisp_dev *bdisp = ctx->bdisp_dev;
  
  	dev_dbg(bdisp->dev, "%s\n", __func__);
  
  	if (mutex_lock_interruptible(&bdisp->lock))
  		return -ERESTARTSYS;
  
  	v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
  
  	bdisp_ctrls_delete(ctx);
  
  	v4l2_fh_del(&ctx->fh);
  	v4l2_fh_exit(&ctx->fh);
  
  	if (--bdisp->m2m.refcnt <= 0)
  		clear_bit(ST_M2M_OPEN, &bdisp->state);
  
  	bdisp_hw_free_nodes(ctx);
  
  	kfree(ctx);
  
  	mutex_unlock(&bdisp->lock);
  
  	return 0;
  }
  
  static const struct v4l2_file_operations bdisp_fops = {
  	.owner          = THIS_MODULE,
  	.open           = bdisp_open,
  	.release        = bdisp_release,
  	.poll           = v4l2_m2m_fop_poll,
  	.unlocked_ioctl = video_ioctl2,
  	.mmap           = v4l2_m2m_fop_mmap,
  };
  
  static int bdisp_querycap(struct file *file, void *fh,
  			  struct v4l2_capability *cap)
  {
  	struct bdisp_ctx *ctx = fh_to_ctx(fh);
  	struct bdisp_dev *bdisp = ctx->bdisp_dev;
  
  	strlcpy(cap->driver, bdisp->pdev->name, sizeof(cap->driver));
  	strlcpy(cap->card, bdisp->pdev->name, sizeof(cap->card));
  	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s%d",
  		 BDISP_NAME, bdisp->id);
  
  	cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M;
  
  	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
  
  	return 0;
  }
  
  static int bdisp_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
  {
  	struct bdisp_ctx *ctx = fh_to_ctx(fh);
  	const struct bdisp_fmt *fmt;
  
  	if (f->index >= ARRAY_SIZE(bdisp_formats))
  		return -EINVAL;
  
  	fmt = &bdisp_formats[f->index];
  
  	if ((fmt->pixelformat == V4L2_PIX_FMT_YUV420) &&
  	    (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)) {
  		dev_dbg(ctx->bdisp_dev->dev, "No YU12 on capture\n");
  		return -EINVAL;
  	}
  	f->pixelformat = fmt->pixelformat;
  
  	return 0;
  }
  
  static int bdisp_g_fmt(struct file *file, void *fh, struct v4l2_format *f)
  {
  	struct bdisp_ctx *ctx = fh_to_ctx(fh);
  	struct v4l2_pix_format *pix;
  	struct bdisp_frame *frame  = ctx_get_frame(ctx, f->type);
  
  	if (IS_ERR(frame)) {
  		dev_err(ctx->bdisp_dev->dev, "Invalid frame (%p)\n", frame);
  		return PTR_ERR(frame);
  	}
  
  	pix = &f->fmt.pix;
  	pix->width = frame->width;
  	pix->height = frame->height;
  	pix->pixelformat = frame->fmt->pixelformat;
  	pix->field = frame->field;
  	pix->bytesperline = frame->bytesperline;
  	pix->sizeimage = frame->sizeimage;
  	pix->colorspace = (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) ?
  				frame->colorspace : bdisp_dflt_fmt.colorspace;
  
  	return 0;
  }
  
  static int bdisp_try_fmt(struct file *file, void *fh, struct v4l2_format *f)
  {
  	struct bdisp_ctx *ctx = fh_to_ctx(fh);
  	struct v4l2_pix_format *pix = &f->fmt.pix;
  	const struct bdisp_fmt *format;
  	u32 in_w, in_h;
  
  	format = bdisp_find_fmt(pix->pixelformat);
  	if (!format) {
  		dev_dbg(ctx->bdisp_dev->dev, "Unknown format 0x%x\n",
  			pix->pixelformat);
  		return -EINVAL;
  	}
  
  	/* YUV420P only supported for VIDEO_OUTPUT */
  	if ((format->pixelformat == V4L2_PIX_FMT_YUV420) &&
  	    (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)) {
  		dev_dbg(ctx->bdisp_dev->dev, "No YU12 on capture\n");
  		return -EINVAL;
  	}
  
  	/* Field (interlaced only supported on OUTPUT) */
  	if ((f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) ||
  	    (pix->field != V4L2_FIELD_INTERLACED))
  		pix->field = V4L2_FIELD_NONE;
  
  	/* Adjust width & height */
  	in_w = pix->width;
  	in_h = pix->height;
  	v4l_bound_align_image(&pix->width,
  			      BDISP_MIN_W, BDISP_MAX_W,
  			      ffs(format->w_align) - 1,
  			      &pix->height,
  			      BDISP_MIN_H, BDISP_MAX_H,
  			      ffs(format->h_align) - 1,
  			      0);
  	if ((pix->width != in_w) || (pix->height != in_h))
  		dev_dbg(ctx->bdisp_dev->dev,
  			"%s size updated: %dx%d -> %dx%d\n", __func__,
  			in_w, in_h, pix->width, pix->height);
  
  	pix->bytesperline = (pix->width * format->bpp_plane0) / 8;
  	pix->sizeimage = (pix->width * pix->height * format->bpp) / 8;
  
  	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
  		pix->colorspace = bdisp_dflt_fmt.colorspace;
  
  	return 0;
  }
  
  static int bdisp_s_fmt(struct file *file, void *fh, struct v4l2_format *f)
  {
  	struct bdisp_ctx *ctx = fh_to_ctx(fh);
  	struct vb2_queue *vq;
  	struct bdisp_frame *frame;
  	struct v4l2_pix_format *pix;
  	int ret;
  	u32 state;
  
  	ret = bdisp_try_fmt(file, fh, f);
  	if (ret) {
  		dev_err(ctx->bdisp_dev->dev, "Cannot set format\n");
  		return ret;
  	}
  
  	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
  	if (vb2_is_streaming(vq)) {
  		dev_err(ctx->bdisp_dev->dev, "queue (%d) busy\n", f->type);
  		return -EBUSY;
  	}
  
  	frame = (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) ?
  			&ctx->src : &ctx->dst;
  	pix = &f->fmt.pix;
  	frame->fmt = bdisp_find_fmt(pix->pixelformat);
  	if (!frame->fmt) {
  		dev_err(ctx->bdisp_dev->dev, "Unknown format 0x%x\n",
  			pix->pixelformat);
  		return -EINVAL;
  	}
  
  	frame->width = pix->width;
  	frame->height = pix->height;
  	frame->bytesperline = pix->bytesperline;
  	frame->sizeimage = pix->sizeimage;
  	frame->field = pix->field;
  	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
  		frame->colorspace = pix->colorspace;
  
  	frame->crop.width = frame->width;
  	frame->crop.height = frame->height;
  	frame->crop.left = 0;
  	frame->crop.top = 0;
  
  	state = BDISP_PARAMS;
  	state |= (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) ?
  			BDISP_DST_FMT : BDISP_SRC_FMT;
  	bdisp_ctx_state_lock_set(state, ctx);
  
  	return 0;
  }
  
  static int bdisp_g_selection(struct file *file, void *fh,
  			     struct v4l2_selection *s)
  {
  	struct bdisp_frame *frame;
  	struct bdisp_ctx *ctx = fh_to_ctx(fh);
  
  	frame = ctx_get_frame(ctx, s->type);
  	if (IS_ERR(frame)) {
  		dev_err(ctx->bdisp_dev->dev, "Invalid frame (%p)\n", frame);
  		return PTR_ERR(frame);
  	}
  
  	switch (s->type) {
  	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
  		switch (s->target) {
  		case V4L2_SEL_TGT_CROP:
  			/* cropped frame */
  			s->r = frame->crop;
  			break;
  		case V4L2_SEL_TGT_CROP_DEFAULT:
  		case V4L2_SEL_TGT_CROP_BOUNDS:
  			/* complete frame */
  			s->r.left = 0;
  			s->r.top = 0;
  			s->r.width = frame->width;
  			s->r.height = frame->height;
  			break;
  		default:
  			dev_err(ctx->bdisp_dev->dev, "Invalid target\n");
  			return -EINVAL;
  		}
  		break;
  
  	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
  		switch (s->target) {
  		case V4L2_SEL_TGT_COMPOSE:
  		case V4L2_SEL_TGT_COMPOSE_PADDED:
  			/* composed (cropped) frame */
  			s->r = frame->crop;
  			break;
  		case V4L2_SEL_TGT_COMPOSE_DEFAULT:
  		case V4L2_SEL_TGT_COMPOSE_BOUNDS:
  			/* complete frame */
  			s->r.left = 0;
  			s->r.top = 0;
  			s->r.width = frame->width;
  			s->r.height = frame->height;
  			break;
  		default:
  			dev_err(ctx->bdisp_dev->dev, "Invalid target\n");
  			return -EINVAL;
  		}
  		break;
  
  	default:
  		dev_err(ctx->bdisp_dev->dev, "Invalid type\n");
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int is_rect_enclosed(struct v4l2_rect *a, struct v4l2_rect *b)
  {
  	/* Return 1 if a is enclosed in b, or 0 otherwise. */
  
  	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 bdisp_s_selection(struct file *file, void *fh,
  			     struct v4l2_selection *s)
  {
  	struct bdisp_frame *frame;
  	struct bdisp_ctx *ctx = fh_to_ctx(fh);
  	struct v4l2_rect *in, out;
  	bool valid = false;
  
  	if ((s->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) &&
  	    (s->target == V4L2_SEL_TGT_CROP))
  		valid = true;
  
  	if ((s->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
  	    (s->target == V4L2_SEL_TGT_COMPOSE))
  		valid = true;
  
  	if (!valid) {
  		dev_err(ctx->bdisp_dev->dev, "Invalid type / target\n");
  		return -EINVAL;
  	}
  
  	frame = ctx_get_frame(ctx, s->type);
  	if (IS_ERR(frame)) {
  		dev_err(ctx->bdisp_dev->dev, "Invalid frame (%p)\n", frame);
  		return PTR_ERR(frame);
  	}
  
  	in = &s->r;
  	out = *in;
  
  	/* Align and check origin */
  	out.left = ALIGN(in->left, frame->fmt->w_align);
  	out.top = ALIGN(in->top, frame->fmt->h_align);
  
  	if ((out.left < 0) || (out.left >= frame->width) ||
  	    (out.top < 0) || (out.top >= frame->height)) {
  		dev_err(ctx->bdisp_dev->dev,
  			"Invalid crop: %dx%d@(%d,%d) vs frame: %dx%d\n",
  			out.width, out.height, out.left, out.top,
  			frame->width, frame->height);
  		return -EINVAL;
  	}
  
  	/* Align and check size */
  	out.width = ALIGN(in->width, frame->fmt->w_align);
  	out.height = ALIGN(in->height, frame->fmt->w_align);
  
  	if (((out.left + out.width) > frame->width) ||
  	    ((out.top + out.height) > frame->height)) {
  		dev_err(ctx->bdisp_dev->dev,
  			"Invalid crop: %dx%d@(%d,%d) vs frame: %dx%d\n",
  			out.width, out.height, out.left, out.top,
  			frame->width, frame->height);
  		return -EINVAL;
  	}
  
  	/* Checks adjust constraints flags */
  	if (s->flags & V4L2_SEL_FLAG_LE && !is_rect_enclosed(&out, in))
  		return -ERANGE;
  
  	if (s->flags & V4L2_SEL_FLAG_GE && !is_rect_enclosed(in, &out))
  		return -ERANGE;
  
  	if ((out.left != in->left) || (out.top != in->top) ||
  	    (out.width != in->width) || (out.height != in->height)) {
  		dev_dbg(ctx->bdisp_dev->dev,
  			"%s crop updated: %dx%d@(%d,%d) -> %dx%d@(%d,%d)\n",
  			__func__, in->width, in->height, in->left, in->top,
  			out.width, out.height, out.left, out.top);
  		*in = out;
  	}
  
  	frame->crop = out;
  
  	bdisp_ctx_state_lock_set(BDISP_PARAMS, ctx);
  
  	return 0;
  }
  
  static int bdisp_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
  {
  	struct bdisp_ctx *ctx = fh_to_ctx(fh);
  
  	if ((type == V4L2_BUF_TYPE_VIDEO_OUTPUT) &&
  	    !bdisp_ctx_state_is_set(BDISP_SRC_FMT, ctx)) {
  		dev_err(ctx->bdisp_dev->dev, "src not defined\n");
  		return -EINVAL;
  	}
  
  	if ((type == V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
  	    !bdisp_ctx_state_is_set(BDISP_DST_FMT, ctx)) {
  		dev_err(ctx->bdisp_dev->dev, "dst not defined\n");
  		return -EINVAL;
  	}
  
  	return v4l2_m2m_streamon(file, ctx->fh.m2m_ctx, type);
  }
  
  static const struct v4l2_ioctl_ops bdisp_ioctl_ops = {
  	.vidioc_querycap                = bdisp_querycap,
  	.vidioc_enum_fmt_vid_cap        = bdisp_enum_fmt,
  	.vidioc_enum_fmt_vid_out        = bdisp_enum_fmt,
  	.vidioc_g_fmt_vid_cap           = bdisp_g_fmt,
  	.vidioc_g_fmt_vid_out           = bdisp_g_fmt,
  	.vidioc_try_fmt_vid_cap         = bdisp_try_fmt,
  	.vidioc_try_fmt_vid_out         = bdisp_try_fmt,
  	.vidioc_s_fmt_vid_cap           = bdisp_s_fmt,
  	.vidioc_s_fmt_vid_out           = bdisp_s_fmt,
  	.vidioc_g_selection		= bdisp_g_selection,
  	.vidioc_s_selection		= bdisp_s_selection,
  	.vidioc_reqbufs                 = v4l2_m2m_ioctl_reqbufs,
  	.vidioc_create_bufs             = v4l2_m2m_ioctl_create_bufs,
  	.vidioc_expbuf                  = v4l2_m2m_ioctl_expbuf,
  	.vidioc_querybuf                = v4l2_m2m_ioctl_querybuf,
  	.vidioc_qbuf                    = v4l2_m2m_ioctl_qbuf,
  	.vidioc_dqbuf                   = v4l2_m2m_ioctl_dqbuf,
  	.vidioc_streamon                = bdisp_streamon,
  	.vidioc_streamoff               = v4l2_m2m_ioctl_streamoff,
  	.vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
  	.vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
  };
  
  static int bdisp_register_device(struct bdisp_dev *bdisp)
  {
  	int ret;
  
  	if (!bdisp)
  		return -ENODEV;
  
  	bdisp->vdev.fops        = &bdisp_fops;
  	bdisp->vdev.ioctl_ops   = &bdisp_ioctl_ops;
  	bdisp->vdev.release     = video_device_release_empty;
  	bdisp->vdev.lock        = &bdisp->lock;
  	bdisp->vdev.vfl_dir     = VFL_DIR_M2M;
  	bdisp->vdev.v4l2_dev    = &bdisp->v4l2_dev;
  	snprintf(bdisp->vdev.name, sizeof(bdisp->vdev.name), "%s.%d",
  		 BDISP_NAME, bdisp->id);
  
  	video_set_drvdata(&bdisp->vdev, bdisp);
  
  	bdisp->m2m.vdev = &bdisp->vdev;
  	bdisp->m2m.m2m_dev = v4l2_m2m_init(&bdisp_m2m_ops);
  	if (IS_ERR(bdisp->m2m.m2m_dev)) {
  		dev_err(bdisp->dev, "failed to initialize v4l2-m2m device\n");
  		return PTR_ERR(bdisp->m2m.m2m_dev);
  	}
  
  	ret = video_register_device(&bdisp->vdev, VFL_TYPE_GRABBER, -1);
  	if (ret) {
  		dev_err(bdisp->dev,
  			"%s(): failed to register video device\n", __func__);
  		v4l2_m2m_release(bdisp->m2m.m2m_dev);
  		return ret;
  	}
  
  	return 0;
  }
  
  static void bdisp_unregister_device(struct bdisp_dev *bdisp)
  {
  	if (!bdisp)
  		return;
  
  	if (bdisp->m2m.m2m_dev)
  		v4l2_m2m_release(bdisp->m2m.m2m_dev);
  
  	video_unregister_device(bdisp->m2m.vdev);
  }
  
  static irqreturn_t bdisp_irq_thread(int irq, void *priv)
  {
  	struct bdisp_dev *bdisp = priv;
  	struct bdisp_ctx *ctx;
  
  	spin_lock(&bdisp->slock);
  
  	bdisp_dbg_perf_end(bdisp);
  
  	cancel_delayed_work(&bdisp->timeout_work);
  
  	if (!test_and_clear_bit(ST_M2M_RUNNING, &bdisp->state))
  		goto isr_unlock;
  
  	if (test_and_clear_bit(ST_M2M_SUSPENDING, &bdisp->state)) {
  		set_bit(ST_M2M_SUSPENDED, &bdisp->state);
  		wake_up(&bdisp->irq_queue);
  		goto isr_unlock;
  	}
  
  	ctx = v4l2_m2m_get_curr_priv(bdisp->m2m.m2m_dev);
  	if (!ctx || !ctx->fh.m2m_ctx)
  		goto isr_unlock;
  
  	spin_unlock(&bdisp->slock);
  
  	bdisp_job_finish(ctx, VB2_BUF_STATE_DONE);
  
  	if (bdisp_ctx_state_is_set(BDISP_CTX_STOP_REQ, ctx)) {
  		bdisp_ctx_state_lock_clear(BDISP_CTX_STOP_REQ, ctx);
  		wake_up(&bdisp->irq_queue);
  	}
  
  	return IRQ_HANDLED;
  
  isr_unlock:
  	spin_unlock(&bdisp->slock);
  
  	return IRQ_HANDLED;
  }
  
  static irqreturn_t bdisp_irq_handler(int irq, void *priv)
  {
  	if (bdisp_hw_get_and_clear_irq((struct bdisp_dev *)priv))
  		return IRQ_NONE;
  	else
  		return IRQ_WAKE_THREAD;
  }
  
  static void bdisp_irq_timeout(struct work_struct *ptr)
  {
  	struct delayed_work *twork = to_delayed_work(ptr);
  	struct bdisp_dev *bdisp = container_of(twork, struct bdisp_dev,
  			timeout_work);
  	struct bdisp_ctx *ctx;
  
  	ctx = v4l2_m2m_get_curr_priv(bdisp->m2m.m2m_dev);
  
  	dev_err(ctx->bdisp_dev->dev, "Device work timeout\n");
  
  	spin_lock(&bdisp->slock);
  	clear_bit(ST_M2M_RUNNING, &bdisp->state);
  	spin_unlock(&bdisp->slock);
  
  	bdisp_hw_reset(bdisp);
  
  	bdisp_job_finish(ctx, VB2_BUF_STATE_ERROR);
  }
  
  static int bdisp_m2m_suspend(struct bdisp_dev *bdisp)
  {
  	unsigned long flags;
  	int timeout;
  
  	spin_lock_irqsave(&bdisp->slock, flags);
  	if (!test_bit(ST_M2M_RUNNING, &bdisp->state)) {
  		spin_unlock_irqrestore(&bdisp->slock, flags);
  		return 0;
  	}
  	clear_bit(ST_M2M_SUSPENDED, &bdisp->state);
  	set_bit(ST_M2M_SUSPENDING, &bdisp->state);
  	spin_unlock_irqrestore(&bdisp->slock, flags);
  
  	timeout = wait_event_timeout(bdisp->irq_queue,
  				     test_bit(ST_M2M_SUSPENDED, &bdisp->state),
  				     BDISP_WORK_TIMEOUT);
  
  	clear_bit(ST_M2M_SUSPENDING, &bdisp->state);
  
  	if (!timeout) {
  		dev_err(bdisp->dev, "%s IRQ timeout\n", __func__);
  		return -EAGAIN;
  	}
  
  	return 0;
  }
  
  static int bdisp_m2m_resume(struct bdisp_dev *bdisp)
  {
  	struct bdisp_ctx *ctx;
  	unsigned long flags;
  
  	spin_lock_irqsave(&bdisp->slock, flags);
  	ctx = bdisp->m2m.ctx;
  	bdisp->m2m.ctx = NULL;
  	spin_unlock_irqrestore(&bdisp->slock, flags);
  
  	if (test_and_clear_bit(ST_M2M_SUSPENDED, &bdisp->state))
  		bdisp_job_finish(ctx, VB2_BUF_STATE_ERROR);
  
  	return 0;
  }
  
  static int bdisp_runtime_resume(struct device *dev)
  {
  	struct bdisp_dev *bdisp = dev_get_drvdata(dev);
  	int ret = clk_enable(bdisp->clock);
  
  	if (ret)
  		return ret;
  
  	return bdisp_m2m_resume(bdisp);
  }
  
  static int bdisp_runtime_suspend(struct device *dev)
  {
  	struct bdisp_dev *bdisp = dev_get_drvdata(dev);
  	int ret = bdisp_m2m_suspend(bdisp);
  
  	if (!ret)
  		clk_disable(bdisp->clock);
  
  	return ret;
  }
  
  static int bdisp_resume(struct device *dev)
  {
  	struct bdisp_dev *bdisp = dev_get_drvdata(dev);
  	unsigned long flags;
  	int opened;
  
  	spin_lock_irqsave(&bdisp->slock, flags);
  	opened = test_bit(ST_M2M_OPEN, &bdisp->state);
  	spin_unlock_irqrestore(&bdisp->slock, flags);
  
  	if (!opened)
  		return 0;
  
  	if (!pm_runtime_suspended(dev))
  		return bdisp_runtime_resume(dev);
  
  	return 0;
  }
  
  static int bdisp_suspend(struct device *dev)
  {
  	if (!pm_runtime_suspended(dev))
  		return bdisp_runtime_suspend(dev);
  
  	return 0;
  }
  
  static const struct dev_pm_ops bdisp_pm_ops = {
  	.suspend                = bdisp_suspend,
  	.resume                 = bdisp_resume,
  	.runtime_suspend        = bdisp_runtime_suspend,
  	.runtime_resume         = bdisp_runtime_resume,
  };
  
  static int bdisp_remove(struct platform_device *pdev)
  {
  	struct bdisp_dev *bdisp = platform_get_drvdata(pdev);
  
  	bdisp_unregister_device(bdisp);
  
  	bdisp_hw_free_filters(bdisp->dev);
  
  	pm_runtime_disable(&pdev->dev);
  
  	bdisp_debugfs_remove(bdisp);
  
  	v4l2_device_unregister(&bdisp->v4l2_dev);
  
  	if (!IS_ERR(bdisp->clock))
  		clk_unprepare(bdisp->clock);
  
  	dev_dbg(&pdev->dev, "%s driver unloaded\n", pdev->name);
  
  	return 0;
  }
  
  static int bdisp_probe(struct platform_device *pdev)
  {
  	struct bdisp_dev *bdisp;
  	struct resource *res;
  	struct device *dev = &pdev->dev;
  	int ret;
  
  	dev_dbg(dev, "%s\n", __func__);
  
  	bdisp = devm_kzalloc(dev, sizeof(struct bdisp_dev), GFP_KERNEL);
  	if (!bdisp)
  		return -ENOMEM;
  
  	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
  	if (ret)
  		return ret;
  
  	bdisp->pdev = pdev;
  	bdisp->dev = dev;
  	platform_set_drvdata(pdev, bdisp);
  
  	if (dev->of_node)
  		bdisp->id = of_alias_get_id(pdev->dev.of_node, BDISP_NAME);
  	else
  		bdisp->id = pdev->id;
  
  	init_waitqueue_head(&bdisp->irq_queue);
  	INIT_DELAYED_WORK(&bdisp->timeout_work, bdisp_irq_timeout);
  	bdisp->work_queue = create_workqueue(BDISP_NAME);
  
  	spin_lock_init(&bdisp->slock);
  	mutex_init(&bdisp->lock);
  
  	/* get resources */
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	bdisp->regs = devm_ioremap_resource(dev, res);
  	if (IS_ERR(bdisp->regs)) {
  		dev_err(dev, "failed to get regs\n");
  		return PTR_ERR(bdisp->regs);
  	}
  
  	bdisp->clock = devm_clk_get(dev, BDISP_NAME);
  	if (IS_ERR(bdisp->clock)) {
  		dev_err(dev, "failed to get clock\n");
  		return PTR_ERR(bdisp->clock);
  	}
  
  	ret = clk_prepare(bdisp->clock);
  	if (ret < 0) {
  		dev_err(dev, "clock prepare failed\n");
  		bdisp->clock = ERR_PTR(-EINVAL);
  		return ret;
  	}
  
  	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  	if (!res) {
  		dev_err(dev, "failed to get IRQ resource\n");
  		ret = -EINVAL;
  		goto err_clk;
  	}
  
  	ret = devm_request_threaded_irq(dev, res->start, bdisp_irq_handler,
  					bdisp_irq_thread, IRQF_ONESHOT,
  					pdev->name, bdisp);
  	if (ret) {
  		dev_err(dev, "failed to install irq\n");
  		goto err_clk;
  	}
  
  	/* v4l2 register */
  	ret = v4l2_device_register(dev, &bdisp->v4l2_dev);
  	if (ret) {
  		dev_err(dev, "failed to register\n");
  		goto err_clk;
  	}
  
  	/* Debug */
  	ret = bdisp_debugfs_create(bdisp);
  	if (ret) {
  		dev_err(dev, "failed to create debugfs\n");
  		goto err_v4l2;
  	}
  
  	/* Power management */
  	pm_runtime_enable(dev);
  	ret = pm_runtime_get_sync(dev);
  	if (ret < 0) {
  		dev_err(dev, "failed to set PM\n");
  		goto err_dbg;
  	}
  
  	/* Filters */
  	if (bdisp_hw_alloc_filters(bdisp->dev)) {
  		dev_err(bdisp->dev, "no memory for filters\n");
  		ret = -ENOMEM;
  		goto err_pm;
  	}
  
  	/* Register */
  	ret = bdisp_register_device(bdisp);
  	if (ret) {
  		dev_err(dev, "failed to register\n");
  		goto err_filter;
  	}
  
  	dev_info(dev, "%s%d registered as /dev/video%d\n", BDISP_NAME,
  		 bdisp->id, bdisp->vdev.num);
  
  	pm_runtime_put(dev);
  
  	return 0;
  
  err_filter:
  	bdisp_hw_free_filters(bdisp->dev);
  err_pm:
  	pm_runtime_put(dev);
  err_dbg:
  	bdisp_debugfs_remove(bdisp);
  err_v4l2:
  	v4l2_device_unregister(&bdisp->v4l2_dev);
  err_clk:
  	if (!IS_ERR(bdisp->clock))
  		clk_unprepare(bdisp->clock);
  
  	return ret;
  }
  
  static const struct of_device_id bdisp_match_types[] = {
  	{
  		.compatible = "st,stih407-bdisp",
  	},
  	{ /* end node */ }
  };
  
  MODULE_DEVICE_TABLE(of, bdisp_match_types);
  
  static struct platform_driver bdisp_driver = {
  	.probe          = bdisp_probe,
  	.remove         = bdisp_remove,
  	.driver         = {
  		.name           = BDISP_NAME,
  		.of_match_table = bdisp_match_types,
  		.pm             = &bdisp_pm_ops,
  	},
  };
  
  module_platform_driver(bdisp_driver);
  
  MODULE_DESCRIPTION("2D blitter for STMicroelectronics SoC");
  MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
  MODULE_LICENSE("GPL");
  