[v3,3/4,media] exynos-scaler: Add m2m functionality for the SCALER driver

Message ID	1378991371-24428-4-git-send-email-shaik.ameer@samsung.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-samsung-soc-owner@kernel.org> From: Shaik Ameer Basha <shaik.ameer@samsung.com> To: linux-media@vger.kernel.org, linux-samsung-soc@vger.kernel.org Cc: s.nawrocki@samsung.com, posciak@google.com, inki.dae@samsung.com, hverkuil@xs4all.nl, shaik.ameer@samsung.com Subject: [PATCH v3 3/4] [media] exynos-scaler: Add m2m functionality for the SCALER driver Date: Thu, 12 Sep 2013 18:39:30 +0530 Message-Id: <1378991371-24428-4-git-send-email-shaik.ameer@samsung.com> In-Reply-To: <1378991371-24428-1-git-send-email-shaik.ameer@samsung.com> References: <1378991371-24428-1-git-send-email-shaik.ameer@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig index 8068d7b..339d3ba 100644 --- a/drivers/media/platform/Kconfig +++ b/drivers/media/platform/Kconfig @@ -201,6 +201,14 @@ config VIDEO_SAMSUNG_EXYNOS_GSC help This is a v4l2 driver for Samsung EXYNOS5 SoC G-Scaler. +config VIDEO_SAMSUNG_EXYNOS_SCALER + tristate "Samsung Exynos SCALER driver" + depends on OF && VIDEO_DEV && VIDEO_V4L2 && ARCH_EXYNOS5 + select VIDEOBUF2_DMA_CONTIG + select V4L2_MEM2MEM_DEV + help + This is a v4l2 driver for Samsung EXYNOS5410/5420 SoC SCALER. + config VIDEO_SH_VEU tristate "SuperH VEU mem2mem video processing driver" depends on VIDEO_DEV && VIDEO_V4L2 && GENERIC_HARDIRQS && HAS_DMA diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile index 4e4da48..14cdad5 100644 --- a/drivers/media/platform/Makefile +++ b/drivers/media/platform/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_VIDEO_SAMSUNG_S5P_TV) += s5p-tv/ obj-$(CONFIG_VIDEO_SAMSUNG_S5P_G2D) += s5p-g2d/ obj-$(CONFIG_VIDEO_SAMSUNG_EXYNOS_GSC) += exynos-gsc/ +obj-$(CONFIG_VIDEO_SAMSUNG_EXYNOS_SCALER) += exynos-scaler/ obj-$(CONFIG_BLACKFIN) += blackfin/ diff --git a/drivers/media/platform/exynos-scaler/Makefile b/drivers/media/platform/exynos-scaler/Makefile new file mode 100644 index 0000000..6c8a25b --- /dev/null +++ b/drivers/media/platform/exynos-scaler/Makefile @@ -0,0 +1,3 @@ +exynos-scaler-objs := scaler.o scaler-m2m.o scaler-regs.o + +obj-$(CONFIG_VIDEO_SAMSUNG_EXYNOS_SCALER) += exynos-scaler.o diff --git a/drivers/media/platform/exynos-scaler/scaler-m2m.c b/drivers/media/platform/exynos-scaler/scaler-m2m.c new file mode 100644 index 0000000..eb32f2f --- /dev/null +++ b/drivers/media/platform/exynos-scaler/scaler-m2m.c @@ -0,0 +1,781 @@ +/* + * Copyright (c) 2013 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Samsung EXYNOS5 SoC series SCALER driver + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/pm_runtime.h> + +#include <media/v4l2-ioctl.h> + +#include "scaler-regs.h" + +#define SCALER_DEF_PIX_FMT V4L2_PIX_FMT_RGB32 +#define SCALER_DEF_WIDTH 1280 +#define SCALER_DEF_HEIGHT 720 + +static int scaler_m2m_ctx_stop_req(struct scaler_ctx *ctx) +{ + struct scaler_ctx *curr_ctx; + struct scaler_dev *scaler = ctx->scaler_dev; + int ret; + + curr_ctx = v4l2_m2m_get_curr_priv(scaler->m2m.m2m_dev); + if (!scaler_m2m_pending(scaler) || (curr_ctx != ctx)) + return 0; + + scaler_ctx_state_lock_set(SCALER_CTX_STOP_REQ, ctx); + ret = wait_event_timeout(scaler->irq_queue, + !scaler_ctx_state_is_set(SCALER_CTX_STOP_REQ, ctx), + SCALER_SHUTDOWN_TIMEOUT); + + return ret == 0 ? -ETIMEDOUT : ret; +} + +static int scaler_m2m_start_streaming(struct vb2_queue *q, unsigned int count) +{ + struct scaler_ctx *ctx = q->drv_priv; + int ret; + + ret = pm_runtime_get_sync(&ctx->scaler_dev->pdev->dev); + + return ret > 0 ? 0 : ret; +} + +static int scaler_m2m_stop_streaming(struct vb2_queue *q) +{ + struct scaler_ctx *ctx = q->drv_priv; + int ret; + + ret = scaler_m2m_ctx_stop_req(ctx); + if (ret < 0) + scaler_m2m_job_finish(ctx, VB2_BUF_STATE_ERROR); + + pm_runtime_put(&ctx->scaler_dev->pdev->dev); + + return 0; +} + +void scaler_m2m_job_finish(struct scaler_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) { + v4l2_m2m_buf_done(src_vb, vb_state); + v4l2_m2m_buf_done(dst_vb, vb_state); + + v4l2_m2m_job_finish(ctx->scaler_dev->m2m.m2m_dev, + ctx->m2m_ctx); + } +} + +static void scaler_m2m_job_abort(void *priv) +{ + struct scaler_ctx *ctx = priv; + int ret; + + ret = scaler_m2m_ctx_stop_req(ctx); + if (ret < 0) + scaler_m2m_job_finish(ctx, VB2_BUF_STATE_ERROR); +} + +static int scaler_get_bufs(struct scaler_ctx *ctx) +{ + struct scaler_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 = scaler_prepare_addr(ctx, src_vb, s_frame, &s_frame->addr); + if (ret < 0) + return ret; + + dst_vb = v4l2_m2m_next_dst_buf(ctx->m2m_ctx); + ret = scaler_prepare_addr(ctx, dst_vb, d_frame, &d_frame->addr); + if (ret < 0) + return ret; + + dst_vb->v4l2_buf.timestamp = src_vb->v4l2_buf.timestamp; + + return 0; +} + +static void scaler_m2m_device_run(void *priv) +{ + struct scaler_ctx *ctx = priv; + struct scaler_dev *scaler; + unsigned long flags; + int ret; + bool is_stopped; + + if (WARN(!ctx, "Null hardware context\n")) + return; + + scaler = ctx->scaler_dev; + spin_lock_irqsave(&scaler->slock, flags); + + set_bit(ST_M2M_PEND, &scaler->state); + + /* Reconfigure hardware if the context has changed. */ + if (scaler->m2m.ctx != ctx) { + scaler_dbg(scaler, "scaler->m2m.ctx = 0x%p, current_ctx = 0x%p", + scaler->m2m.ctx, ctx); + ctx->state |= SCALER_PARAMS; + scaler->m2m.ctx = ctx; + } + + is_stopped = ctx->state & SCALER_CTX_STOP_REQ; + ctx->state &= ~SCALER_CTX_STOP_REQ; + if (is_stopped) { + wake_up(&scaler->irq_queue); + goto unlock; + } + + ret = scaler_get_bufs(ctx); + if (ret < 0) { + scaler_dbg(scaler, "Wrong address\n"); + goto unlock; + } + + scaler_hw_address_queue_reset(ctx); + scaler_set_prefbuf(scaler, &ctx->s_frame); + scaler_hw_set_input_addr(scaler, &ctx->s_frame.addr); + scaler_hw_set_output_addr(scaler, &ctx->d_frame.addr); + scaler_hw_set_csc_coeff(ctx); + + if (ctx->state & SCALER_PARAMS) { + scaler_hw_set_irq(scaler, SCALER_INT_FRAME_END, false); + if (scaler_set_scaler_info(ctx)) { + scaler_dbg(scaler, "Scaler setup error"); + goto unlock; + } + + scaler_hw_set_in_size(ctx); + scaler_hw_set_in_image_format(ctx); + + scaler_hw_set_out_size(ctx); + scaler_hw_set_out_image_format(ctx); + + scaler_hw_set_scaler_ratio(ctx); + scaler_hw_set_rotation(ctx); + } + + ctx->state &= ~SCALER_PARAMS; + scaler_hw_enable_control(scaler, true); + + spin_unlock_irqrestore(&scaler->slock, flags); + return; + +unlock: + ctx->state &= ~SCALER_PARAMS; + spin_unlock_irqrestore(&scaler->slock, flags); +} + +static int scaler_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 scaler_ctx *ctx = vb2_get_drv_priv(vq); + struct scaler_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->scaler_dev->alloc_ctx; + } + return 0; +} + +static int scaler_m2m_buf_prepare(struct vb2_buffer *vb) +{ + struct scaler_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); + struct scaler_frame *frame; + int i; + + frame = ctx_get_frame(ctx, vb->vb2_queue->type); + if (IS_ERR(frame)) + return PTR_ERR(frame); + + for (i = 0; i < frame->fmt->num_planes; i++) + vb2_set_plane_payload(vb, i, frame->payload[i]); + + return 0; +} + +static void scaler_m2m_buf_queue(struct vb2_buffer *vb) +{ + struct scaler_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); + + scaler_dbg(ctx->scaler_dev, "ctx: %p, ctx->state: 0x%x", + ctx, ctx->state); + + if (ctx->m2m_ctx) + v4l2_m2m_buf_queue(ctx->m2m_ctx, vb); +} + +static void scaler_lock(struct vb2_queue *vq) +{ + struct scaler_ctx *ctx = vb2_get_drv_priv(vq); + mutex_lock(&ctx->scaler_dev->lock); +} + +static void scaler_unlock(struct vb2_queue *vq) +{ + struct scaler_ctx *ctx = vb2_get_drv_priv(vq); + mutex_unlock(&ctx->scaler_dev->lock); +} + +static struct vb2_ops scaler_m2m_qops = { + .queue_setup = scaler_m2m_queue_setup, + .buf_prepare = scaler_m2m_buf_prepare, + .buf_queue = scaler_m2m_buf_queue, + .wait_prepare = scaler_unlock, + .wait_finish = scaler_lock, + .stop_streaming = scaler_m2m_stop_streaming, + .start_streaming = scaler_m2m_start_streaming, +}; + +static int scaler_m2m_querycap(struct file *file, void *fh, + struct v4l2_capability *cap) +{ + struct scaler_ctx *ctx = fh_to_ctx(fh); + struct scaler_dev *scaler = ctx->scaler_dev; + + cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE; + cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; + + strlcpy(cap->driver, scaler->pdev->name, sizeof(cap->driver)); + strlcpy(cap->card, scaler->pdev->name, sizeof(cap->card)); + strlcpy(cap->bus_info, "platform:exynos5-scaler", + sizeof(cap->bus_info)); + + return 0; +} + +static int scaler_m2m_enum_fmt_mplane(struct file *file, void *priv, + struct v4l2_fmtdesc *f) +{ + return scaler_enum_fmt_mplane(f); +} + +static int scaler_m2m_g_fmt_mplane(struct file *file, void *fh, + struct v4l2_format *f) +{ + struct scaler_ctx *ctx = fh_to_ctx(fh); + + return scaler_g_fmt_mplane(ctx, f); +} + +static int scaler_m2m_try_fmt_mplane(struct file *file, void *fh, + struct v4l2_format *f) +{ + struct scaler_ctx *ctx = fh_to_ctx(fh); + + return scaler_try_fmt_mplane(ctx, f); +} + +static int scaler_m2m_set_default_format(struct scaler_ctx *ctx) +{ + struct scaler_frame *frame; + u32 def_pixformat = SCALER_DEF_PIX_FMT; + int i; + + frame = &ctx->s_frame; + + frame->colorspace = V4L2_COLORSPACE_REC709; + frame->fmt = scaler_find_fmt(&def_pixformat, NULL, 0); + if (!frame->fmt) + return -EINVAL; + + scaler_set_frame_size(frame, SCALER_DEF_WIDTH, SCALER_DEF_HEIGHT); + for (i = 0; i < frame->fmt->num_planes; i++) + frame->payload[i] = SCALER_DEF_WIDTH * SCALER_DEF_HEIGHT * + (frame->fmt->depth[i] / 8); + + scaler_ctx_state_lock_set(SCALER_PARAMS, ctx); + + /* Apply the same src frame settings to dst frame */ + ctx->d_frame = ctx->s_frame; + + return 0; +} + + +static int scaler_m2m_s_fmt_mplane(struct file *file, void *fh, + struct v4l2_format *f) +{ + struct scaler_ctx *ctx = fh_to_ctx(fh); + struct vb2_queue *vq; + struct scaler_frame *frame; + struct v4l2_pix_format_mplane *pix; + int i, ret = 0; + + ret = scaler_m2m_try_fmt_mplane(file, fh, f); + if (ret < 0) + return ret; + + vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type); + + if (vb2_is_streaming(vq)) { + scaler_dbg(ctx->scaler_dev, "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->colorspace = pix->colorspace; + frame->fmt = scaler_find_fmt(&pix->pixelformat, NULL, 0); + if (!frame->fmt) + return -EINVAL; + + for (i = 0; i < frame->fmt->num_planes; i++) + frame->payload[i] = pix->plane_fmt[i].sizeimage; + + scaler_set_frame_size(frame, pix->width, pix->height); + scaler_ctx_state_lock_set(SCALER_PARAMS, ctx); + + scaler_dbg(ctx->scaler_dev, "f_w: %d, f_h: %d", + frame->f_width, frame->f_height); + + return 0; +} + +static int scaler_m2m_reqbufs(struct file *file, void *fh, + struct v4l2_requestbuffers *reqbufs) +{ + struct scaler_ctx *ctx = fh_to_ctx(fh); + struct scaler_dev *scaler = ctx->scaler_dev; + u32 max_cnt; + + if (reqbufs->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) + max_cnt = scaler->variant->in_buf_cnt; + else + max_cnt = scaler->variant->out_buf_cnt; + + if (reqbufs->count > max_cnt) { + /* Adjust the count value as per driver supports */ + reqbufs->count = max_cnt; + } + + return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs); +} + +static int scaler_m2m_expbuf(struct file *file, void *fh, + struct v4l2_exportbuffer *eb) +{ + struct scaler_ctx *ctx = fh_to_ctx(fh); + return v4l2_m2m_expbuf(file, ctx->m2m_ctx, eb); +} + +static int scaler_m2m_querybuf(struct file *file, void *fh, + struct v4l2_buffer *buf) +{ + struct scaler_ctx *ctx = fh_to_ctx(fh); + return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf); +} + +static int scaler_m2m_qbuf(struct file *file, void *fh, + struct v4l2_buffer *buf) +{ + struct scaler_ctx *ctx = fh_to_ctx(fh); + return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf); +} + +static int scaler_m2m_dqbuf(struct file *file, void *fh, + struct v4l2_buffer *buf) +{ + struct scaler_ctx *ctx = fh_to_ctx(fh); + return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf); +} + +static int scaler_m2m_streamon(struct file *file, void *fh, + enum v4l2_buf_type type) +{ + struct scaler_ctx *ctx = fh_to_ctx(fh); + return v4l2_m2m_streamon(file, ctx->m2m_ctx, type); +} + +static int scaler_m2m_streamoff(struct file *file, void *fh, + enum v4l2_buf_type type) +{ + struct scaler_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) +{ + return !((a->left < b->left) || + (a->top < b->top) || + (a->left + a->width > b->left + b->width) || + (a->top + a->height > b->top + b->height)); +} + +static int scaler_m2m_g_selection(struct file *file, void *fh, + struct v4l2_selection *s) +{ + struct scaler_frame *frame; + struct scaler_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 scaler_m2m_s_selection(struct file *file, void *fh, + struct v4l2_selection *s) +{ + struct scaler_frame *frame; + struct scaler_ctx *ctx = fh_to_ctx(fh); + struct v4l2_crop cr; + struct scaler_variant *variant = ctx->scaler_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 = scaler_try_crop(ctx, &cr); + if (ret < 0) + 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 (s->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) { + ret = scaler_check_scaler_ratio(variant, cr.c.width, + cr.c.height, ctx->d_frame.crop.width, + ctx->d_frame.crop.height, + ctx->ctrls_scaler.rotate->val); + } else { + ret = scaler_check_scaler_ratio(variant, + ctx->s_frame.crop.width, + ctx->s_frame.crop.height, cr.c.width, + cr.c.height, ctx->ctrls_scaler.rotate->val); + } + + if (ret < 0) { + scaler_dbg(ctx->scaler_dev, "Out of scaler range"); + return -EINVAL; + } + + frame->crop = cr.c; + + scaler_ctx_state_lock_set(SCALER_PARAMS, ctx); + return 0; +} + +static const struct v4l2_ioctl_ops scaler_m2m_ioctl_ops = { + .vidioc_querycap = scaler_m2m_querycap, + .vidioc_enum_fmt_vid_cap_mplane = scaler_m2m_enum_fmt_mplane, + .vidioc_enum_fmt_vid_out_mplane = scaler_m2m_enum_fmt_mplane, + .vidioc_g_fmt_vid_cap_mplane = scaler_m2m_g_fmt_mplane, + .vidioc_g_fmt_vid_out_mplane = scaler_m2m_g_fmt_mplane, + .vidioc_try_fmt_vid_cap_mplane = scaler_m2m_try_fmt_mplane, + .vidioc_try_fmt_vid_out_mplane = scaler_m2m_try_fmt_mplane, + .vidioc_s_fmt_vid_cap_mplane = scaler_m2m_s_fmt_mplane, + .vidioc_s_fmt_vid_out_mplane = scaler_m2m_s_fmt_mplane, + .vidioc_reqbufs = scaler_m2m_reqbufs, + .vidioc_expbuf = scaler_m2m_expbuf, + .vidioc_querybuf = scaler_m2m_querybuf, + .vidioc_qbuf = scaler_m2m_qbuf, + .vidioc_dqbuf = scaler_m2m_dqbuf, + .vidioc_streamon = scaler_m2m_streamon, + .vidioc_streamoff = scaler_m2m_streamoff, + .vidioc_g_selection = scaler_m2m_g_selection, + .vidioc_s_selection = scaler_m2m_s_selection +}; + +static int queue_init(void *priv, struct vb2_queue *src_vq, + struct vb2_queue *dst_vq) +{ + struct scaler_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 = &scaler_m2m_qops; + src_vq->mem_ops = &vb2_dma_contig_memops; + src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer); + + ret = vb2_queue_init(src_vq); + if (ret < 0) + 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 = &scaler_m2m_qops; + dst_vq->mem_ops = &vb2_dma_contig_memops; + dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer); + + return vb2_queue_init(dst_vq); +} + +static int scaler_m2m_open(struct file *file) +{ + struct scaler_dev *scaler = video_drvdata(file); + struct scaler_ctx *ctx = NULL; + int ret; + + scaler_dbg(scaler, "pid: %d, state: 0x%lx", + task_pid_nr(current), scaler->state); + + if (mutex_lock_interruptible(&scaler->lock)) + return -ERESTARTSYS; + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + if (!ctx) { + ret = -ENOMEM; + goto unlock; + } + + v4l2_fh_init(&ctx->fh, scaler->m2m.vfd); + ret = scaler_ctrls_create(ctx); + if (ret < 0) + 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->scaler_dev = scaler; + /* Default color format */ + ctx->s_frame.fmt = scaler_get_format(0); + ctx->d_frame.fmt = scaler_get_format(0); + ctx->flags = 0; + + ctx->m2m_ctx = v4l2_m2m_ctx_init(scaler->m2m.m2m_dev, ctx, queue_init); + if (IS_ERR(ctx->m2m_ctx)) { + scaler_dbg(scaler, "Failed to initialize m2m context"); + ret = PTR_ERR(ctx->m2m_ctx); + goto error_ctrls; + } + + /* Apply default format settings */ + ret = scaler_m2m_set_default_format(ctx); + if (ret < 0) { + scaler_dbg(scaler, "Failed to set default format settings"); + goto error_ctrls; + } + + if (scaler->m2m.refcnt++ == 0) + set_bit(ST_M2M_OPEN, &scaler->state); + + scaler_dbg(scaler, "scaler m2m driver is opened, ctx(0x%p)", ctx); + + mutex_unlock(&scaler->lock); + return 0; + +error_ctrls: + scaler_ctrls_delete(ctx); +error_fh: + v4l2_fh_del(&ctx->fh); + v4l2_fh_exit(&ctx->fh); + kfree(ctx); +unlock: + mutex_unlock(&scaler->lock); + return ret; +} + +static int scaler_m2m_release(struct file *file) +{ + struct scaler_ctx *ctx = fh_to_ctx(file->private_data); + struct scaler_dev *scaler = ctx->scaler_dev; + + scaler_dbg(scaler, "pid: %d, state: 0x%lx, refcnt= %d", + task_pid_nr(current), scaler->state, scaler->m2m.refcnt); + + mutex_lock(&scaler->lock); + + v4l2_m2m_ctx_release(ctx->m2m_ctx); + scaler_ctrls_delete(ctx); + v4l2_fh_del(&ctx->fh); + v4l2_fh_exit(&ctx->fh); + + if (--scaler->m2m.refcnt <= 0) + clear_bit(ST_M2M_OPEN, &scaler->state); + kfree(ctx); + + mutex_unlock(&scaler->lock); + return 0; +} + +static unsigned int scaler_m2m_poll(struct file *file, + struct poll_table_struct *wait) +{ + struct scaler_ctx *ctx = fh_to_ctx(file->private_data); + struct scaler_dev *scaler = ctx->scaler_dev; + int ret; + + if (mutex_lock_interruptible(&scaler->lock)) + return -ERESTARTSYS; + + ret = v4l2_m2m_poll(file, ctx->m2m_ctx, wait); + mutex_unlock(&scaler->lock); + + return ret; +} + +static int scaler_m2m_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct scaler_ctx *ctx = fh_to_ctx(file->private_data); + struct scaler_dev *scaler = ctx->scaler_dev; + int ret; + + if (mutex_lock_interruptible(&scaler->lock)) + return -ERESTARTSYS; + + ret = v4l2_m2m_mmap(file, ctx->m2m_ctx, vma); + mutex_unlock(&scaler->lock); + + return ret; +} + +static const struct v4l2_file_operations scaler_m2m_fops = { + .owner = THIS_MODULE, + .open = scaler_m2m_open, + .release = scaler_m2m_release, + .poll = scaler_m2m_poll, + .unlocked_ioctl = video_ioctl2, + .mmap = scaler_m2m_mmap, +}; + +static struct v4l2_m2m_ops scaler_m2m_ops = { + .device_run = scaler_m2m_device_run, + .job_abort = scaler_m2m_job_abort, +}; + +int scaler_register_m2m_device(struct scaler_dev *scaler) +{ + struct platform_device *pdev; + int ret; + + if (!scaler) + return -ENODEV; + + pdev = scaler->pdev; + + scaler->vdev.fops = &scaler_m2m_fops; + scaler->vdev.ioctl_ops = &scaler_m2m_ioctl_ops; + scaler->vdev.release = video_device_release_empty; + scaler->vdev.lock = &scaler->lock; + scaler->vdev.vfl_dir = VFL_DIR_M2M; + snprintf(scaler->vdev.name, sizeof(scaler->vdev.name), "%s:m2m", + SCALER_MODULE_NAME); + + video_set_drvdata(&scaler->vdev, scaler); + + scaler->m2m.vfd = &scaler->vdev; + scaler->m2m.m2m_dev = v4l2_m2m_init(&scaler_m2m_ops); + if (IS_ERR(scaler->m2m.m2m_dev)) { + dev_err(&pdev->dev, "failed to initialize v4l2-m2m device\n"); + return PTR_ERR(scaler->m2m.m2m_dev); + } + + ret = video_register_device(&scaler->vdev, VFL_TYPE_GRABBER, -1); + if (ret < 0) { + dev_err(&pdev->dev, + "%s(): failed to register video device\n", __func__); + v4l2_m2m_release(scaler->m2m.m2m_dev); + return ret; + } + + dev_info(&pdev->dev, "scaler m2m driver registered as /dev/video%d", + scaler->vdev.num); + return 0; +} + +void scaler_unregister_m2m_device(struct scaler_dev *scaler) +{ + if (scaler) { + video_unregister_device(scaler->m2m.vfd); + v4l2_m2m_release(scaler->m2m.m2m_dev); + } +}

[v3,3/4,media] exynos-scaler: Add m2m functionality for the SCALER driver

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