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linux-sg2042/drivers/media/platform/exynos-gsc/gsc-m2m.c

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/*
* 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_v4l2_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->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->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_v4l2_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->vb2_buf, 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->vb2_buf, d_frame, &d_frame->addr);
if (ret)
return ret;
dst_vb->vb2_buf.timestamp = src_vb->vb2_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,
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 vb2_v4l2_buffer *vbuf = to_vb2_v4l2_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, vbuf);
}
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 = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
.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;
src_vq->lock = &ctx->gsc_dev->lock;
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;
dst_vq->lock = &ctx->gsc_dev->lock;
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);
}
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