diff options
Diffstat (limited to 'drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c')
| -rw-r--r-- | drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c | 858 |
1 files changed, 858 insertions, 0 deletions
diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c new file mode 100644 index 000000000..9745d6219 --- /dev/null +++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c @@ -0,0 +1,858 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ISI V4L2 memory to memory driver for i.MX8QXP/QM platform + * + * ISI is a Image Sensor Interface of i.MX8QXP/QM platform, which + * used to process image from camera sensor or memory to memory or DC + * + * Copyright (c) 2019 NXP Semiconductor + */ + +#include <linux/container_of.h> +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/limits.h> +#include <linux/minmax.h> +#include <linux/mutex.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/videodev2.h> + +#include <media/media-entity.h> +#include <media/v4l2-ctrls.h> +#include <media/v4l2-device.h> +#include <media/v4l2-event.h> +#include <media/v4l2-fh.h> +#include <media/v4l2-ioctl.h> +#include <media/v4l2-mem2mem.h> +#include <media/videobuf2-core.h> +#include <media/videobuf2-dma-contig.h> + +#include "imx8-isi-core.h" + +struct mxc_isi_m2m_buffer { + struct v4l2_m2m_buffer buf; + dma_addr_t dma_addrs[3]; +}; + +struct mxc_isi_m2m_ctx_queue_data { + struct v4l2_pix_format_mplane format; + const struct mxc_isi_format_info *info; + u32 sequence; +}; + +struct mxc_isi_m2m_ctx { + struct v4l2_fh fh; + struct mxc_isi_m2m *m2m; + + /* Protects the m2m vb2 queues */ + struct mutex vb2_lock; + + struct { + struct mxc_isi_m2m_ctx_queue_data out; + struct mxc_isi_m2m_ctx_queue_data cap; + } queues; + + struct { + struct v4l2_ctrl_handler handler; + unsigned int alpha; + bool hflip; + bool vflip; + } ctrls; + + bool chained; +}; + +static inline struct mxc_isi_m2m_buffer * +to_isi_m2m_buffer(struct vb2_v4l2_buffer *buf) +{ + return container_of(buf, struct mxc_isi_m2m_buffer, buf.vb); +} + +static inline struct mxc_isi_m2m_ctx *to_isi_m2m_ctx(struct v4l2_fh *fh) +{ + return container_of(fh, struct mxc_isi_m2m_ctx, fh); +} + +static inline struct mxc_isi_m2m_ctx_queue_data * +mxc_isi_m2m_ctx_qdata(struct mxc_isi_m2m_ctx *ctx, enum v4l2_buf_type type) +{ + if (V4L2_TYPE_IS_OUTPUT(type)) + return &ctx->queues.out; + else + return &ctx->queues.cap; +} + +/* ----------------------------------------------------------------------------- + * V4L2 M2M device operations + */ + +static void mxc_isi_m2m_frame_write_done(struct mxc_isi_pipe *pipe, u32 status) +{ + struct mxc_isi_m2m *m2m = &pipe->isi->m2m; + struct vb2_v4l2_buffer *src_vbuf, *dst_vbuf; + struct mxc_isi_m2m_ctx *ctx; + + ctx = v4l2_m2m_get_curr_priv(m2m->m2m_dev); + if (!ctx) { + dev_err(m2m->isi->dev, + "Instance released before the end of transaction\n"); + return; + } + + src_vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx); + dst_vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); + + v4l2_m2m_buf_copy_metadata(src_vbuf, dst_vbuf, false); + + src_vbuf->sequence = ctx->queues.out.sequence++; + dst_vbuf->sequence = ctx->queues.cap.sequence++; + + v4l2_m2m_buf_done(src_vbuf, VB2_BUF_STATE_DONE); + v4l2_m2m_buf_done(dst_vbuf, VB2_BUF_STATE_DONE); + + v4l2_m2m_job_finish(m2m->m2m_dev, ctx->fh.m2m_ctx); +} + +static void mxc_isi_m2m_device_run(void *priv) +{ + struct mxc_isi_m2m_ctx *ctx = priv; + struct mxc_isi_m2m *m2m = ctx->m2m; + struct vb2_v4l2_buffer *src_vbuf, *dst_vbuf; + struct mxc_isi_m2m_buffer *src_buf, *dst_buf; + + mxc_isi_channel_disable(m2m->pipe); + + mutex_lock(&m2m->lock); + + /* If the context has changed, reconfigure the channel. */ + if (m2m->last_ctx != ctx) { + const struct v4l2_area in_size = { + .width = ctx->queues.out.format.width, + .height = ctx->queues.out.format.height, + }; + const struct v4l2_area scale = { + .width = ctx->queues.cap.format.width, + .height = ctx->queues.cap.format.height, + }; + const struct v4l2_rect crop = { + .width = ctx->queues.cap.format.width, + .height = ctx->queues.cap.format.height, + }; + + mxc_isi_channel_config(m2m->pipe, MXC_ISI_INPUT_MEM, + &in_size, &scale, &crop, + ctx->queues.out.info->encoding, + ctx->queues.cap.info->encoding); + mxc_isi_channel_set_input_format(m2m->pipe, + ctx->queues.out.info, + &ctx->queues.out.format); + mxc_isi_channel_set_output_format(m2m->pipe, + ctx->queues.cap.info, + &ctx->queues.cap.format); + + m2m->last_ctx = ctx; + } + + mutex_unlock(&m2m->lock); + + mutex_lock(ctx->ctrls.handler.lock); + mxc_isi_channel_set_alpha(m2m->pipe, ctx->ctrls.alpha); + mxc_isi_channel_set_flip(m2m->pipe, ctx->ctrls.hflip, ctx->ctrls.vflip); + mutex_unlock(ctx->ctrls.handler.lock); + + src_vbuf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx); + dst_vbuf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx); + + src_buf = to_isi_m2m_buffer(src_vbuf); + dst_buf = to_isi_m2m_buffer(dst_vbuf); + + mxc_isi_channel_set_inbuf(m2m->pipe, src_buf->dma_addrs[0]); + mxc_isi_channel_set_outbuf(m2m->pipe, dst_buf->dma_addrs, MXC_ISI_BUF1); + mxc_isi_channel_set_outbuf(m2m->pipe, dst_buf->dma_addrs, MXC_ISI_BUF2); + + mxc_isi_channel_enable(m2m->pipe); + + mxc_isi_channel_m2m_start(m2m->pipe); +} + +static const struct v4l2_m2m_ops mxc_isi_m2m_ops = { + .device_run = mxc_isi_m2m_device_run, +}; + +/* ----------------------------------------------------------------------------- + * videobuf2 queue operations + */ + +static int mxc_isi_m2m_vb2_queue_setup(struct vb2_queue *q, + unsigned int *num_buffers, + unsigned int *num_planes, + unsigned int sizes[], + struct device *alloc_devs[]) +{ + struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(q); + const struct mxc_isi_m2m_ctx_queue_data *qdata = + mxc_isi_m2m_ctx_qdata(ctx, q->type); + + return mxc_isi_video_queue_setup(&qdata->format, qdata->info, + num_buffers, num_planes, sizes); +} + +static int mxc_isi_m2m_vb2_buffer_init(struct vb2_buffer *vb2) +{ + struct vb2_queue *vq = vb2->vb2_queue; + struct mxc_isi_m2m_buffer *buf = to_isi_m2m_buffer(to_vb2_v4l2_buffer(vb2)); + struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(vb2->vb2_queue); + const struct mxc_isi_m2m_ctx_queue_data *qdata = + mxc_isi_m2m_ctx_qdata(ctx, vq->type); + + mxc_isi_video_buffer_init(vb2, buf->dma_addrs, qdata->info, + &qdata->format); + + return 0; +} + +static int mxc_isi_m2m_vb2_buffer_prepare(struct vb2_buffer *vb2) +{ + struct vb2_queue *vq = vb2->vb2_queue; + struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(vq); + const struct mxc_isi_m2m_ctx_queue_data *qdata = + mxc_isi_m2m_ctx_qdata(ctx, vq->type); + + return mxc_isi_video_buffer_prepare(ctx->m2m->isi, vb2, qdata->info, + &qdata->format); +} + +static void mxc_isi_m2m_vb2_buffer_queue(struct vb2_buffer *vb2) +{ + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2); + struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(vb2->vb2_queue); + + v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf); +} + +static int mxc_isi_m2m_vb2_start_streaming(struct vb2_queue *q, + unsigned int count) +{ + struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(q); + struct mxc_isi_m2m_ctx_queue_data *qdata = + mxc_isi_m2m_ctx_qdata(ctx, q->type); + + qdata->sequence = 0; + + return 0; +} + +static void mxc_isi_m2m_vb2_stop_streaming(struct vb2_queue *q) +{ + struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(q); + struct vb2_v4l2_buffer *vbuf; + + for (;;) { + if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) + vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx); + else + vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); + if (!vbuf) + break; + + v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR); + } +} + +static const struct vb2_ops mxc_isi_m2m_vb2_qops = { + .queue_setup = mxc_isi_m2m_vb2_queue_setup, + .buf_init = mxc_isi_m2m_vb2_buffer_init, + .buf_prepare = mxc_isi_m2m_vb2_buffer_prepare, + .buf_queue = mxc_isi_m2m_vb2_buffer_queue, + .wait_prepare = vb2_ops_wait_prepare, + .wait_finish = vb2_ops_wait_finish, + .start_streaming = mxc_isi_m2m_vb2_start_streaming, + .stop_streaming = mxc_isi_m2m_vb2_stop_streaming, +}; + +static int mxc_isi_m2m_queue_init(void *priv, struct vb2_queue *src_vq, + struct vb2_queue *dst_vq) +{ + struct mxc_isi_m2m_ctx *ctx = priv; + struct mxc_isi_m2m *m2m = ctx->m2m; + int ret; + + src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE; + src_vq->io_modes = VB2_MMAP | VB2_DMABUF; + src_vq->drv_priv = ctx; + src_vq->buf_struct_size = sizeof(struct mxc_isi_m2m_buffer); + src_vq->ops = &mxc_isi_m2m_vb2_qops; + src_vq->mem_ops = &vb2_dma_contig_memops; + src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; + src_vq->lock = &ctx->vb2_lock; + src_vq->dev = m2m->isi->dev; + + ret = vb2_queue_init(src_vq); + if (ret) + return ret; + + dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE; + dst_vq->io_modes = VB2_MMAP | VB2_DMABUF; + dst_vq->drv_priv = ctx; + dst_vq->buf_struct_size = sizeof(struct mxc_isi_m2m_buffer); + dst_vq->ops = &mxc_isi_m2m_vb2_qops; + dst_vq->mem_ops = &vb2_dma_contig_memops; + dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; + dst_vq->lock = &ctx->vb2_lock; + dst_vq->dev = m2m->isi->dev; + + return vb2_queue_init(dst_vq); +} + +/* ----------------------------------------------------------------------------- + * V4L2 controls + */ + +static inline struct mxc_isi_m2m_ctx * +ctrl_to_mxc_isi_m2m_ctx(struct v4l2_ctrl *ctrl) +{ + return container_of(ctrl->handler, struct mxc_isi_m2m_ctx, ctrls.handler); +} + +static int mxc_isi_m2m_ctx_s_ctrl(struct v4l2_ctrl *ctrl) +{ + struct mxc_isi_m2m_ctx *ctx = ctrl_to_mxc_isi_m2m_ctx(ctrl); + + switch (ctrl->id) { + case V4L2_CID_HFLIP: + ctx->ctrls.hflip = ctrl->val; + break; + + case V4L2_CID_VFLIP: + ctx->ctrls.vflip = ctrl->val; + break; + + case V4L2_CID_ALPHA_COMPONENT: + ctx->ctrls.alpha = ctrl->val; + break; + } + + return 0; +} + +static const struct v4l2_ctrl_ops mxc_isi_m2m_ctx_ctrl_ops = { + .s_ctrl = mxc_isi_m2m_ctx_s_ctrl, +}; + +static int mxc_isi_m2m_ctx_ctrls_create(struct mxc_isi_m2m_ctx *ctx) +{ + struct v4l2_ctrl_handler *handler = &ctx->ctrls.handler; + int ret; + + v4l2_ctrl_handler_init(handler, 3); + + v4l2_ctrl_new_std(handler, &mxc_isi_m2m_ctx_ctrl_ops, + V4L2_CID_ALPHA_COMPONENT, 0, 255, 1, 0); + v4l2_ctrl_new_std(handler, &mxc_isi_m2m_ctx_ctrl_ops, + V4L2_CID_HFLIP, 0, 1, 1, 0); + v4l2_ctrl_new_std(handler, &mxc_isi_m2m_ctx_ctrl_ops, + V4L2_CID_VFLIP, 0, 1, 1, 0); + + if (handler->error) { + ret = handler->error; + v4l2_ctrl_handler_free(handler); + return ret; + } + + ctx->fh.ctrl_handler = handler; + + return 0; +} + +static void mxc_isi_m2m_ctx_ctrls_delete(struct mxc_isi_m2m_ctx *ctx) +{ + v4l2_ctrl_handler_free(&ctx->ctrls.handler); +} + +/* ----------------------------------------------------------------------------- + * V4L2 ioctls + */ + +static int mxc_isi_m2m_querycap(struct file *file, void *fh, + struct v4l2_capability *cap) +{ + strscpy(cap->driver, MXC_ISI_DRIVER_NAME, sizeof(cap->driver)); + strscpy(cap->card, MXC_ISI_M2M, sizeof(cap->card)); + cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE; + cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; + + return 0; +} + +static int mxc_isi_m2m_enum_fmt_vid(struct file *file, void *fh, + struct v4l2_fmtdesc *f) +{ + const enum mxc_isi_video_type type = + f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ? + MXC_ISI_VIDEO_M2M_OUT : MXC_ISI_VIDEO_M2M_CAP; + const struct mxc_isi_format_info *info; + + info = mxc_isi_format_enum(f->index, type); + if (!info) + return -EINVAL; + + f->pixelformat = info->fourcc; + f->flags |= V4L2_FMT_FLAG_CSC_COLORSPACE | V4L2_FMT_FLAG_CSC_YCBCR_ENC + | V4L2_FMT_FLAG_CSC_QUANTIZATION | V4L2_FMT_FLAG_CSC_XFER_FUNC; + + return 0; +} + +static const struct mxc_isi_format_info * +__mxc_isi_m2m_try_fmt_vid(struct mxc_isi_m2m_ctx *ctx, + struct v4l2_pix_format_mplane *pix, + const enum mxc_isi_video_type type) +{ + if (type == MXC_ISI_VIDEO_M2M_CAP) { + /* Downscaling only */ + pix->width = min(pix->width, ctx->queues.out.format.width); + pix->height = min(pix->height, ctx->queues.out.format.height); + } + + return mxc_isi_format_try(ctx->m2m->pipe, pix, type); +} + +static int mxc_isi_m2m_try_fmt_vid(struct file *file, void *fh, + struct v4l2_format *f) +{ + const enum mxc_isi_video_type type = + f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ? + MXC_ISI_VIDEO_M2M_OUT : MXC_ISI_VIDEO_M2M_CAP; + struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh); + + __mxc_isi_m2m_try_fmt_vid(ctx, &f->fmt.pix_mp, type); + + return 0; +} + +static int mxc_isi_m2m_g_fmt_vid(struct file *file, void *fh, + struct v4l2_format *f) +{ + struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh); + const struct mxc_isi_m2m_ctx_queue_data *qdata = + mxc_isi_m2m_ctx_qdata(ctx, f->type); + + f->fmt.pix_mp = qdata->format; + + return 0; +} + +static int mxc_isi_m2m_s_fmt_vid(struct file *file, void *fh, + struct v4l2_format *f) +{ + const enum mxc_isi_video_type type = + f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ? + MXC_ISI_VIDEO_M2M_OUT : MXC_ISI_VIDEO_M2M_CAP; + struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh); + struct v4l2_pix_format_mplane *pix = &f->fmt.pix_mp; + const struct mxc_isi_format_info *info; + struct vb2_queue *vq; + + vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type); + if (!vq) + return -EINVAL; + + if (vb2_is_busy(vq)) + return -EBUSY; + + info = __mxc_isi_m2m_try_fmt_vid(ctx, pix, type); + + if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) { + ctx->queues.out.format = *pix; + ctx->queues.out.info = info; + } + + /* + * Always set the format on the capture side, due to either format + * propagation or direct setting. + */ + ctx->queues.cap.format = *pix; + ctx->queues.cap.info = info; + + return 0; +} + +static int mxc_isi_m2m_streamon(struct file *file, void *fh, + enum v4l2_buf_type type) +{ + struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh); + const struct v4l2_pix_format_mplane *out_pix = &ctx->queues.out.format; + const struct v4l2_pix_format_mplane *cap_pix = &ctx->queues.cap.format; + const struct mxc_isi_format_info *cap_info = ctx->queues.cap.info; + const struct mxc_isi_format_info *out_info = ctx->queues.out.info; + struct mxc_isi_m2m *m2m = ctx->m2m; + bool bypass; + + int ret; + + mutex_lock(&m2m->lock); + + if (m2m->usage_count == INT_MAX) { + ret = -EOVERFLOW; + goto unlock; + } + + bypass = cap_pix->width == out_pix->width && + cap_pix->height == out_pix->height && + cap_info->encoding == out_info->encoding; + + /* + * Acquire the pipe and initialize the channel with the first user of + * the M2M device. + */ + if (m2m->usage_count == 0) { + ret = mxc_isi_channel_acquire(m2m->pipe, + &mxc_isi_m2m_frame_write_done, + bypass); + if (ret) + goto unlock; + + mxc_isi_channel_get(m2m->pipe); + } + + m2m->usage_count++; + + /* + * Allocate resources for the channel, counting how many users require + * buffer chaining. + */ + if (!ctx->chained && out_pix->width > MXC_ISI_MAX_WIDTH_UNCHAINED) { + ret = mxc_isi_channel_chain(m2m->pipe, bypass); + if (ret) + goto deinit; + + m2m->chained_count++; + ctx->chained = true; + } + + /* + * Drop the lock to start the stream, as the .device_run() operation + * needs to acquire it. + */ + mutex_unlock(&m2m->lock); + ret = v4l2_m2m_ioctl_streamon(file, fh, type); + if (ret) { + /* Reacquire the lock for the cleanup path. */ + mutex_lock(&m2m->lock); + goto unchain; + } + + return 0; + +unchain: + if (ctx->chained && --m2m->chained_count == 0) + mxc_isi_channel_unchain(m2m->pipe); + ctx->chained = false; + +deinit: + if (--m2m->usage_count == 0) { + mxc_isi_channel_put(m2m->pipe); + mxc_isi_channel_release(m2m->pipe); + } + +unlock: + mutex_unlock(&m2m->lock); + return ret; +} + +static int mxc_isi_m2m_streamoff(struct file *file, void *fh, + enum v4l2_buf_type type) +{ + struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh); + struct mxc_isi_m2m *m2m = ctx->m2m; + + v4l2_m2m_ioctl_streamoff(file, fh, type); + + mutex_lock(&m2m->lock); + + /* + * If the last context is this one, reset it to make sure the device + * will be reconfigured when streaming is restarted. + */ + if (m2m->last_ctx == ctx) + m2m->last_ctx = NULL; + + /* Free the channel resources if this is the last chained context. */ + if (ctx->chained && --m2m->chained_count == 0) + mxc_isi_channel_unchain(m2m->pipe); + ctx->chained = false; + + /* Turn off the light with the last user. */ + if (--m2m->usage_count == 0) { + mxc_isi_channel_disable(m2m->pipe); + mxc_isi_channel_put(m2m->pipe); + mxc_isi_channel_release(m2m->pipe); + } + + WARN_ON(m2m->usage_count < 0); + + mutex_unlock(&m2m->lock); + + return 0; +} + +static const struct v4l2_ioctl_ops mxc_isi_m2m_ioctl_ops = { + .vidioc_querycap = mxc_isi_m2m_querycap, + + .vidioc_enum_fmt_vid_cap = mxc_isi_m2m_enum_fmt_vid, + .vidioc_enum_fmt_vid_out = mxc_isi_m2m_enum_fmt_vid, + .vidioc_g_fmt_vid_cap_mplane = mxc_isi_m2m_g_fmt_vid, + .vidioc_g_fmt_vid_out_mplane = mxc_isi_m2m_g_fmt_vid, + .vidioc_s_fmt_vid_cap_mplane = mxc_isi_m2m_s_fmt_vid, + .vidioc_s_fmt_vid_out_mplane = mxc_isi_m2m_s_fmt_vid, + .vidioc_try_fmt_vid_cap_mplane = mxc_isi_m2m_try_fmt_vid, + .vidioc_try_fmt_vid_out_mplane = mxc_isi_m2m_try_fmt_vid, + + .vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs, + .vidioc_querybuf = v4l2_m2m_ioctl_querybuf, + .vidioc_qbuf = v4l2_m2m_ioctl_qbuf, + .vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf, + .vidioc_expbuf = v4l2_m2m_ioctl_expbuf, + .vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf, + .vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs, + + .vidioc_streamon = mxc_isi_m2m_streamon, + .vidioc_streamoff = mxc_isi_m2m_streamoff, + + .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, + .vidioc_unsubscribe_event = v4l2_event_unsubscribe, +}; + +/* ----------------------------------------------------------------------------- + * Video device file operations + */ + +static void mxc_isi_m2m_init_format(struct mxc_isi_m2m_ctx *ctx, + struct mxc_isi_m2m_ctx_queue_data *qdata, + enum mxc_isi_video_type type) +{ + qdata->format.width = MXC_ISI_DEF_WIDTH; + qdata->format.height = MXC_ISI_DEF_HEIGHT; + qdata->format.pixelformat = MXC_ISI_DEF_PIXEL_FORMAT; + + qdata->info = mxc_isi_format_try(ctx->m2m->pipe, &qdata->format, type); +} + +static int mxc_isi_m2m_open(struct file *file) +{ + struct video_device *vdev = video_devdata(file); + struct mxc_isi_m2m *m2m = video_drvdata(file); + struct mxc_isi_m2m_ctx *ctx; + int ret; + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->m2m = m2m; + mutex_init(&ctx->vb2_lock); + + v4l2_fh_init(&ctx->fh, vdev); + file->private_data = &ctx->fh; + + ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(m2m->m2m_dev, ctx, + &mxc_isi_m2m_queue_init); + if (IS_ERR(ctx->fh.m2m_ctx)) { + ret = PTR_ERR(ctx->fh.m2m_ctx); + ctx->fh.m2m_ctx = NULL; + goto err_fh; + } + + mxc_isi_m2m_init_format(ctx, &ctx->queues.out, MXC_ISI_VIDEO_M2M_OUT); + mxc_isi_m2m_init_format(ctx, &ctx->queues.cap, MXC_ISI_VIDEO_M2M_CAP); + + ret = mxc_isi_m2m_ctx_ctrls_create(ctx); + if (ret) + goto err_ctx; + + ret = pm_runtime_resume_and_get(m2m->isi->dev); + if (ret) + goto err_ctrls; + + v4l2_fh_add(&ctx->fh); + + return 0; + +err_ctrls: + mxc_isi_m2m_ctx_ctrls_delete(ctx); +err_ctx: + v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); +err_fh: + v4l2_fh_exit(&ctx->fh); + mutex_destroy(&ctx->vb2_lock); + kfree(ctx); + return ret; +} + +static int mxc_isi_m2m_release(struct file *file) +{ + struct mxc_isi_m2m *m2m = video_drvdata(file); + struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(file->private_data); + + v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); + mxc_isi_m2m_ctx_ctrls_delete(ctx); + + v4l2_fh_del(&ctx->fh); + v4l2_fh_exit(&ctx->fh); + + mutex_destroy(&ctx->vb2_lock); + kfree(ctx); + + pm_runtime_put(m2m->isi->dev); + + return 0; +} + +static const struct v4l2_file_operations mxc_isi_m2m_fops = { + .owner = THIS_MODULE, + .open = mxc_isi_m2m_open, + .release = mxc_isi_m2m_release, + .poll = v4l2_m2m_fop_poll, + .unlocked_ioctl = video_ioctl2, + .mmap = v4l2_m2m_fop_mmap, +}; + +/* ----------------------------------------------------------------------------- + * Registration + */ + +int mxc_isi_m2m_register(struct mxc_isi_dev *isi, struct v4l2_device *v4l2_dev) +{ + struct mxc_isi_m2m *m2m = &isi->m2m; + struct video_device *vdev = &m2m->vdev; + struct media_link *link; + int ret; + + m2m->isi = isi; + m2m->pipe = &isi->pipes[0]; + + mutex_init(&m2m->lock); + + /* Initialize the video device and create controls. */ + snprintf(vdev->name, sizeof(vdev->name), "mxc_isi.m2m"); + + vdev->fops = &mxc_isi_m2m_fops; + vdev->ioctl_ops = &mxc_isi_m2m_ioctl_ops; + vdev->v4l2_dev = v4l2_dev; + vdev->minor = -1; + vdev->release = video_device_release_empty; + vdev->vfl_dir = VFL_DIR_M2M; + + vdev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE; + video_set_drvdata(vdev, m2m); + + /* Create the M2M device. */ + m2m->m2m_dev = v4l2_m2m_init(&mxc_isi_m2m_ops); + if (IS_ERR(m2m->m2m_dev)) { + dev_err(isi->dev, "failed to initialize m2m device\n"); + ret = PTR_ERR(m2m->m2m_dev); + goto err_mutex; + } + + /* Register the video device. */ + ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1); + if (ret < 0) { + dev_err(isi->dev, "failed to register m2m device\n"); + goto err_m2m; + } + + /* + * Populate the media graph. We can't use the mem2mem helper + * v4l2_m2m_register_media_controller() as the M2M interface needs to + * be connected to the existing entities in the graph, so we have to + * wire things up manually: + * + * - The entity in the video_device, which isn't touched by the V4L2 + * core for M2M devices, is used as the source I/O entity in the + * graph, connected to the crossbar switch. + * + * - The video device at the end of the pipeline provides the sink + * entity, and is already wired up in the graph. + * + * - A new interface is created, pointing at both entities. The sink + * entity will thus have two interfaces pointing to it. + */ + m2m->pad.flags = MEDIA_PAD_FL_SOURCE; + vdev->entity.name = "mxc_isi.output"; + vdev->entity.function = MEDIA_ENT_F_IO_V4L; + ret = media_entity_pads_init(&vdev->entity, 1, &m2m->pad); + if (ret) + goto err_video; + + ret = media_device_register_entity(v4l2_dev->mdev, &vdev->entity); + if (ret) + goto err_entity_cleanup; + + ret = media_create_pad_link(&vdev->entity, 0, + &m2m->isi->crossbar.sd.entity, + m2m->isi->crossbar.num_sinks - 1, + MEDIA_LNK_FL_IMMUTABLE | + MEDIA_LNK_FL_ENABLED); + if (ret) + goto err_entity_unreg; + + m2m->intf = media_devnode_create(v4l2_dev->mdev, MEDIA_INTF_T_V4L_VIDEO, + 0, VIDEO_MAJOR, vdev->minor); + if (!m2m->intf) { + ret = -ENOMEM; + goto err_entity_unreg; + } + + link = media_create_intf_link(&vdev->entity, &m2m->intf->intf, + MEDIA_LNK_FL_IMMUTABLE | + MEDIA_LNK_FL_ENABLED); + if (!link) { + ret = -ENOMEM; + goto err_devnode; + } + + link = media_create_intf_link(&m2m->pipe->video.vdev.entity, + &m2m->intf->intf, + MEDIA_LNK_FL_IMMUTABLE | + MEDIA_LNK_FL_ENABLED); + if (!link) { + ret = -ENOMEM; + goto err_devnode; + } + + return 0; + +err_devnode: + media_devnode_remove(m2m->intf); +err_entity_unreg: + media_device_unregister_entity(&vdev->entity); +err_entity_cleanup: + media_entity_cleanup(&vdev->entity); +err_video: + video_unregister_device(vdev); +err_m2m: + v4l2_m2m_release(m2m->m2m_dev); +err_mutex: + mutex_destroy(&m2m->lock); + return ret; +} + +int mxc_isi_m2m_unregister(struct mxc_isi_dev *isi) +{ + struct mxc_isi_m2m *m2m = &isi->m2m; + struct video_device *vdev = &m2m->vdev; + + video_unregister_device(vdev); + + v4l2_m2m_release(m2m->m2m_dev); + media_devnode_remove(m2m->intf); + media_entity_cleanup(&vdev->entity); + mutex_destroy(&m2m->lock); + + return 0; +} |