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

   1 /*
   2  * Copyright (c) 2011 - 2012 Samsung Electronics Co., Ltd.
   3  *              http://www.samsung.com
   4  *
   5  * Samsung EXYNOS5 SoC series G-Scaler driver
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation, either version 2 of the License,
  10  * or (at your option) any later version.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/types.h>
  16 #include <linux/errno.h>
  17 #include <linux/bug.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/device.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/list.h>
  23 #include <linux/io.h>
  24 #include <linux/slab.h>
  25 #include <linux/clk.h>
  26
  27 #include <media/v4l2-ioctl.h>
  28
  29 #include "gsc-core.h"
  30
  31 static int gsc_m2m_ctx_stop_req(struct gsc_ctx *ctx)
  32 {
  33         struct gsc_ctx *curr_ctx;
  34         struct gsc_dev *gsc = ctx->gsc_dev;
  35         int ret;
  36
  37         curr_ctx = v4l2_m2m_get_curr_priv(gsc->m2m.m2m_dev);
  38         if (!gsc_m2m_pending(gsc) || (curr_ctx != ctx))
  39                 return 0;
  40
  41         gsc_ctx_state_lock_set(GSC_CTX_STOP_REQ, ctx);
  42         ret = wait_event_timeout(gsc->irq_queue,
  43                         !gsc_ctx_state_is_set(GSC_CTX_STOP_REQ, ctx),
  44                         GSC_SHUTDOWN_TIMEOUT);
  45
  46         return ret == 0 ? -ETIMEDOUT : ret;
  47 }
  48
  49 static void __gsc_m2m_job_abort(struct gsc_ctx *ctx)
  50 {
  51         int ret;
  52
  53         ret = gsc_m2m_ctx_stop_req(ctx);
  54         if ((ret == -ETIMEDOUT) || (ctx->state & GSC_CTX_ABORT)) {
  55                 gsc_ctx_state_lock_clear(GSC_CTX_STOP_REQ | GSC_CTX_ABORT, ctx);
  56                 gsc_m2m_job_finish(ctx, VB2_BUF_STATE_ERROR);
  57         }
  58 }
  59
  60 static int gsc_m2m_start_streaming(struct vb2_queue *q, unsigned int count)
  61 {
  62         struct gsc_ctx *ctx = q->drv_priv;
  63         int ret;
  64
  65         ret = pm_runtime_get_sync(&ctx->gsc_dev->pdev->dev);
  66         return ret > 0 ? 0 : ret;
  67 }
  68
  69 static void gsc_m2m_stop_streaming(struct vb2_queue *q)
  70 {
  71         struct gsc_ctx *ctx = q->drv_priv;
  72
  73         __gsc_m2m_job_abort(ctx);
  74
  75         pm_runtime_put(&ctx->gsc_dev->pdev->dev);
  76 }
  77
  78 void gsc_m2m_job_finish(struct gsc_ctx *ctx, int vb_state)
  79 {
  80         struct vb2_v4l2_buffer *src_vb, *dst_vb;
  81
  82         if (!ctx || !ctx->m2m_ctx)
  83                 return;
  84
  85         src_vb = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
  86         dst_vb = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
  87
  88         if (src_vb && dst_vb) {
  89                 dst_vb->timestamp = src_vb->timestamp;
  90                 dst_vb->timecode = src_vb->timecode;
  91                 dst_vb->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
  92                 dst_vb->flags |=
  93                         src_vb->flags
  94                         & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
  95
  96                 v4l2_m2m_buf_done(src_vb, vb_state);
  97                 v4l2_m2m_buf_done(dst_vb, vb_state);
  98
  99                 v4l2_m2m_job_finish(ctx->gsc_dev->m2m.m2m_dev,
 100                                     ctx->m2m_ctx);
 101         }
 102 }
 103
 104 static void gsc_m2m_job_abort(void *priv)
 105 {
 106         __gsc_m2m_job_abort((struct gsc_ctx *)priv);
 107 }
 108
 109 static int gsc_get_bufs(struct gsc_ctx *ctx)
 110 {
 111         struct gsc_frame *s_frame, *d_frame;
 112         struct vb2_v4l2_buffer *src_vb, *dst_vb;
 113         int ret;
 114
 115         s_frame = &ctx->s_frame;
 116         d_frame = &ctx->d_frame;
 117
 118         src_vb = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
 119         ret = gsc_prepare_addr(ctx, &src_vb->vb2_buf, s_frame, &s_frame->addr);
 120         if (ret)
 121                 return ret;
 122
 123         dst_vb = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
 124         ret = gsc_prepare_addr(ctx, &dst_vb->vb2_buf, d_frame, &d_frame->addr);
 125         if (ret)
 126                 return ret;
 127
 128         dst_vb->timestamp = src_vb->timestamp;
 129
 130         return 0;
 131 }
 132
 133 static void gsc_m2m_device_run(void *priv)
 134 {
 135         struct gsc_ctx *ctx = priv;
 136         struct gsc_dev *gsc;
 137         unsigned long flags;
 138         int ret;
 139         bool is_set = false;
 140
 141         if (WARN(!ctx, "null hardware context\n"))
 142                 return;
 143
 144         gsc = ctx->gsc_dev;
 145         spin_lock_irqsave(&gsc->slock, flags);
 146
 147         set_bit(ST_M2M_PEND, &gsc->state);
 148
 149         /* Reconfigure hardware if the context has changed. */
 150         if (gsc->m2m.ctx != ctx) {
 151                 pr_debug("gsc->m2m.ctx = 0x%p, current_ctx = 0x%p",
 152                                 gsc->m2m.ctx, ctx);
 153                 ctx->state |= GSC_PARAMS;
 154                 gsc->m2m.ctx = ctx;
 155         }
 156
 157         is_set = ctx->state & GSC_CTX_STOP_REQ;
 158         if (is_set) {
 159                 ctx->state &= ~GSC_CTX_STOP_REQ;
 160                 ctx->state |= GSC_CTX_ABORT;
 161                 wake_up(&gsc->irq_queue);
 162                 goto put_device;
 163         }
 164
 165         ret = gsc_get_bufs(ctx);
 166         if (ret) {
 167                 pr_err("Wrong address");
 168                 goto put_device;
 169         }
 170
 171         gsc_set_prefbuf(gsc, &ctx->s_frame);
 172         gsc_hw_set_input_addr(gsc, &ctx->s_frame.addr, GSC_M2M_BUF_NUM);
 173         gsc_hw_set_output_addr(gsc, &ctx->d_frame.addr, GSC_M2M_BUF_NUM);
 174
 175         if (ctx->state & GSC_PARAMS) {
 176                 gsc_hw_set_input_buf_masking(gsc, GSC_M2M_BUF_NUM, false);
 177                 gsc_hw_set_output_buf_masking(gsc, GSC_M2M_BUF_NUM, false);
 178                 gsc_hw_set_frm_done_irq_mask(gsc, false);
 179                 gsc_hw_set_gsc_irq_enable(gsc, true);
 180
 181                 if (gsc_set_scaler_info(ctx)) {
 182                         pr_err("Scaler setup error");
 183                         goto put_device;
 184                 }
 185
 186                 gsc_hw_set_input_path(ctx);
 187                 gsc_hw_set_in_size(ctx);
 188                 gsc_hw_set_in_image_format(ctx);
 189
 190                 gsc_hw_set_output_path(ctx);
 191                 gsc_hw_set_out_size(ctx);
 192                 gsc_hw_set_out_image_format(ctx);
 193
 194                 gsc_hw_set_prescaler(ctx);
 195                 gsc_hw_set_mainscaler(ctx);
 196                 gsc_hw_set_rotation(ctx);
 197                 gsc_hw_set_global_alpha(ctx);
 198         }
 199
 200         /* update shadow registers */
 201         gsc_hw_set_sfr_update(ctx);
 202
 203         ctx->state &= ~GSC_PARAMS;
 204         gsc_hw_enable_control(gsc, true);
 205
 206         spin_unlock_irqrestore(&gsc->slock, flags);
 207         return;
 208
 209 put_device:
 210         ctx->state &= ~GSC_PARAMS;
 211         spin_unlock_irqrestore(&gsc->slock, flags);
 212 }
 213
 214 static int gsc_m2m_queue_setup(struct vb2_queue *vq,
 215                         const void *parg,
 216                         unsigned int *num_buffers, unsigned int *num_planes,
 217                         unsigned int sizes[], void *allocators[])
 218 {
 219         struct gsc_ctx *ctx = vb2_get_drv_priv(vq);
 220         struct gsc_frame *frame;
 221         int i;
 222
 223         frame = ctx_get_frame(ctx, vq->type);
 224         if (IS_ERR(frame))
 225                 return PTR_ERR(frame);
 226
 227         if (!frame->fmt)
 228                 return -EINVAL;
 229
 230         *num_planes = frame->fmt->num_planes;
 231         for (i = 0; i < frame->fmt->num_planes; i++) {
 232                 sizes[i] = frame->payload[i];
 233                 allocators[i] = ctx->gsc_dev->alloc_ctx;
 234         }
 235         return 0;
 236 }
 237
 238 static int gsc_m2m_buf_prepare(struct vb2_buffer *vb)
 239 {
 240         struct gsc_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
 241         struct gsc_frame *frame;
 242         int i;
 243
 244         frame = ctx_get_frame(ctx, vb->vb2_queue->type);
 245         if (IS_ERR(frame))
 246                 return PTR_ERR(frame);
 247
 248         if (!V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) {
 249                 for (i = 0; i < frame->fmt->num_planes; i++)
 250                         vb2_set_plane_payload(vb, i, frame->payload[i]);
 251         }
 252
 253         return 0;
 254 }
 255
 256 static void gsc_m2m_buf_queue(struct vb2_buffer *vb)
 257 {
 258         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 259         struct gsc_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
 260
 261         pr_debug("ctx: %p, ctx->state: 0x%x", ctx, ctx->state);
 262
 263         if (ctx->m2m_ctx)
 264                 v4l2_m2m_buf_queue(ctx->m2m_ctx, vbuf);
 265 }
 266
 267 static struct vb2_ops gsc_m2m_qops = {
 268         .queue_setup     = gsc_m2m_queue_setup,
 269         .buf_prepare     = gsc_m2m_buf_prepare,
 270         .buf_queue       = gsc_m2m_buf_queue,
 271         .wait_prepare    = vb2_ops_wait_prepare,
 272         .wait_finish     = vb2_ops_wait_finish,
 273         .stop_streaming  = gsc_m2m_stop_streaming,
 274         .start_streaming = gsc_m2m_start_streaming,
 275 };
 276
 277 static int gsc_m2m_querycap(struct file *file, void *fh,
 278                            struct v4l2_capability *cap)
 279 {
 280         struct gsc_ctx *ctx = fh_to_ctx(fh);
 281         struct gsc_dev *gsc = ctx->gsc_dev;
 282
 283         strlcpy(cap->driver, gsc->pdev->name, sizeof(cap->driver));
 284         strlcpy(cap->card, gsc->pdev->name, sizeof(cap->card));
 285         strlcpy(cap->bus_info, "platform", sizeof(cap->bus_info));
 286         cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE |
 287                 V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_VIDEO_OUTPUT_MPLANE;
 288
 289         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
 290         return 0;
 291 }
 292
 293 static int gsc_m2m_enum_fmt_mplane(struct file *file, void *priv,
 294                                 struct v4l2_fmtdesc *f)
 295 {
 296         return gsc_enum_fmt_mplane(f);
 297 }
 298
 299 static int gsc_m2m_g_fmt_mplane(struct file *file, void *fh,
 300                              struct v4l2_format *f)
 301 {
 302         struct gsc_ctx *ctx = fh_to_ctx(fh);
 303
 304         return gsc_g_fmt_mplane(ctx, f);
 305 }
 306
 307 static int gsc_m2m_try_fmt_mplane(struct file *file, void *fh,
 308                                   struct v4l2_format *f)
 309 {
 310         struct gsc_ctx *ctx = fh_to_ctx(fh);
 311
 312         return gsc_try_fmt_mplane(ctx, f);
 313 }
 314
 315 static int gsc_m2m_s_fmt_mplane(struct file *file, void *fh,
 316                                  struct v4l2_format *f)
 317 {
 318         struct gsc_ctx *ctx = fh_to_ctx(fh);
 319         struct vb2_queue *vq;
 320         struct gsc_frame *frame;
 321         struct v4l2_pix_format_mplane *pix;
 322         int i, ret = 0;
 323
 324         ret = gsc_m2m_try_fmt_mplane(file, fh, f);
 325         if (ret)
 326                 return ret;
 327
 328         vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
 329
 330         if (vb2_is_streaming(vq)) {
 331                 pr_err("queue (%d) busy", f->type);
 332                 return -EBUSY;
 333         }
 334
 335         if (V4L2_TYPE_IS_OUTPUT(f->type))
 336                 frame = &ctx->s_frame;
 337         else
 338                 frame = &ctx->d_frame;
 339
 340         pix = &f->fmt.pix_mp;
 341         frame->fmt = find_fmt(&pix->pixelformat, NULL, 0);
 342         frame->colorspace = pix->colorspace;
 343         if (!frame->fmt)
 344                 return -EINVAL;
 345
 346         for (i = 0; i < frame->fmt->num_planes; i++)
 347                 frame->payload[i] = pix->plane_fmt[i].sizeimage;
 348
 349         gsc_set_frame_size(frame, pix->width, pix->height);
 350
 351         if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
 352                 gsc_ctx_state_lock_set(GSC_PARAMS | GSC_DST_FMT, ctx);
 353         else
 354                 gsc_ctx_state_lock_set(GSC_PARAMS | GSC_SRC_FMT, ctx);
 355
 356         pr_debug("f_w: %d, f_h: %d", frame->f_width, frame->f_height);
 357
 358         return 0;
 359 }
 360
 361 static int gsc_m2m_reqbufs(struct file *file, void *fh,
 362                           struct v4l2_requestbuffers *reqbufs)
 363 {
 364         struct gsc_ctx *ctx = fh_to_ctx(fh);
 365         struct gsc_dev *gsc = ctx->gsc_dev;
 366         u32 max_cnt;
 367
 368         max_cnt = (reqbufs->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) ?
 369                 gsc->variant->in_buf_cnt : gsc->variant->out_buf_cnt;
 370         if (reqbufs->count > max_cnt) {
 371                 return -EINVAL;
 372         } else if (reqbufs->count == 0) {
 373                 if (reqbufs->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
 374                         gsc_ctx_state_lock_clear(GSC_SRC_FMT, ctx);
 375                 else
 376                         gsc_ctx_state_lock_clear(GSC_DST_FMT, ctx);
 377         }
 378
 379         return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs);
 380 }
 381
 382 static int gsc_m2m_expbuf(struct file *file, void *fh,
 383                                 struct v4l2_exportbuffer *eb)
 384 {
 385         struct gsc_ctx *ctx = fh_to_ctx(fh);
 386         return v4l2_m2m_expbuf(file, ctx->m2m_ctx, eb);
 387 }
 388
 389 static int gsc_m2m_querybuf(struct file *file, void *fh,
 390                                         struct v4l2_buffer *buf)
 391 {
 392         struct gsc_ctx *ctx = fh_to_ctx(fh);
 393         return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf);
 394 }
 395
 396 static int gsc_m2m_qbuf(struct file *file, void *fh,
 397                           struct v4l2_buffer *buf)
 398 {
 399         struct gsc_ctx *ctx = fh_to_ctx(fh);
 400         return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
 401 }
 402
 403 static int gsc_m2m_dqbuf(struct file *file, void *fh,
 404                            struct v4l2_buffer *buf)
 405 {
 406         struct gsc_ctx *ctx = fh_to_ctx(fh);
 407         return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
 408 }
 409
 410 static int gsc_m2m_streamon(struct file *file, void *fh,
 411                            enum v4l2_buf_type type)
 412 {
 413         struct gsc_ctx *ctx = fh_to_ctx(fh);
 414
 415         /* The source and target color format need to be set */
 416         if (V4L2_TYPE_IS_OUTPUT(type)) {
 417                 if (!gsc_ctx_state_is_set(GSC_SRC_FMT, ctx))
 418                         return -EINVAL;
 419         } else if (!gsc_ctx_state_is_set(GSC_DST_FMT, ctx)) {
 420                 return -EINVAL;
 421         }
 422
 423         return v4l2_m2m_streamon(file, ctx->m2m_ctx, type);
 424 }
 425
 426 static int gsc_m2m_streamoff(struct file *file, void *fh,
 427                             enum v4l2_buf_type type)
 428 {
 429         struct gsc_ctx *ctx = fh_to_ctx(fh);
 430         return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type);
 431 }
 432
 433 /* Return 1 if rectangle a is enclosed in rectangle b, or 0 otherwise. */
 434 static int is_rectangle_enclosed(struct v4l2_rect *a, struct v4l2_rect *b)
 435 {
 436         if (a->left < b->left || a->top < b->top)
 437                 return 0;
 438
 439         if (a->left + a->width > b->left + b->width)
 440                 return 0;
 441
 442         if (a->top + a->height > b->top + b->height)
 443                 return 0;
 444
 445         return 1;
 446 }
 447
 448 static int gsc_m2m_g_selection(struct file *file, void *fh,
 449                         struct v4l2_selection *s)
 450 {
 451         struct gsc_frame *frame;
 452         struct gsc_ctx *ctx = fh_to_ctx(fh);
 453
 454         if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
 455             (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE))
 456                 return -EINVAL;
 457
 458         frame = ctx_get_frame(ctx, s->type);
 459         if (IS_ERR(frame))
 460                 return PTR_ERR(frame);
 461
 462         switch (s->target) {
 463         case V4L2_SEL_TGT_COMPOSE_DEFAULT:
 464         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
 465         case V4L2_SEL_TGT_CROP_BOUNDS:
 466         case V4L2_SEL_TGT_CROP_DEFAULT:
 467                 s->r.left = 0;
 468                 s->r.top = 0;
 469                 s->r.width = frame->f_width;
 470                 s->r.height = frame->f_height;
 471                 return 0;
 472
 473         case V4L2_SEL_TGT_COMPOSE:
 474         case V4L2_SEL_TGT_CROP:
 475                 s->r.left = frame->crop.left;
 476                 s->r.top = frame->crop.top;
 477                 s->r.width = frame->crop.width;
 478                 s->r.height = frame->crop.height;
 479                 return 0;
 480         }
 481
 482         return -EINVAL;
 483 }
 484
 485 static int gsc_m2m_s_selection(struct file *file, void *fh,
 486                                 struct v4l2_selection *s)
 487 {
 488         struct gsc_frame *frame;
 489         struct gsc_ctx *ctx = fh_to_ctx(fh);
 490         struct v4l2_crop cr;
 491         struct gsc_variant *variant = ctx->gsc_dev->variant;
 492         int ret;
 493
 494         cr.type = s->type;
 495         cr.c = s->r;
 496
 497         if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
 498             (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE))
 499                 return -EINVAL;
 500
 501         ret = gsc_try_crop(ctx, &cr);
 502         if (ret)
 503                 return ret;
 504
 505         if (s->flags & V4L2_SEL_FLAG_LE &&
 506             !is_rectangle_enclosed(&cr.c, &s->r))
 507                 return -ERANGE;
 508
 509         if (s->flags & V4L2_SEL_FLAG_GE &&
 510             !is_rectangle_enclosed(&s->r, &cr.c))
 511                 return -ERANGE;
 512
 513         s->r = cr.c;
 514
 515         switch (s->target) {
 516         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
 517         case V4L2_SEL_TGT_COMPOSE_DEFAULT:
 518         case V4L2_SEL_TGT_COMPOSE:
 519                 frame = &ctx->s_frame;
 520                 break;
 521
 522         case V4L2_SEL_TGT_CROP_BOUNDS:
 523         case V4L2_SEL_TGT_CROP:
 524         case V4L2_SEL_TGT_CROP_DEFAULT:
 525                 frame = &ctx->d_frame;
 526                 break;
 527
 528         default:
 529                 return -EINVAL;
 530         }
 531
 532         /* Check to see if scaling ratio is within supported range */
 533         if (gsc_ctx_state_is_set(GSC_DST_FMT | GSC_SRC_FMT, ctx)) {
 534                 if (s->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
 535                         ret = gsc_check_scaler_ratio(variant, cr.c.width,
 536                                 cr.c.height, ctx->d_frame.crop.width,
 537                                 ctx->d_frame.crop.height,
 538                                 ctx->gsc_ctrls.rotate->val, ctx->out_path);
 539                 } else {
 540                         ret = gsc_check_scaler_ratio(variant,
 541                                 ctx->s_frame.crop.width,
 542                                 ctx->s_frame.crop.height, cr.c.width,
 543                                 cr.c.height, ctx->gsc_ctrls.rotate->val,
 544                                 ctx->out_path);
 545                 }
 546
 547                 if (ret) {
 548                         pr_err("Out of scaler range");
 549                         return -EINVAL;
 550                 }
 551         }
 552
 553         frame->crop = cr.c;
 554
 555         gsc_ctx_state_lock_set(GSC_PARAMS, ctx);
 556         return 0;
 557 }
 558
 559 static const struct v4l2_ioctl_ops gsc_m2m_ioctl_ops = {
 560         .vidioc_querycap                = gsc_m2m_querycap,
 561         .vidioc_enum_fmt_vid_cap_mplane = gsc_m2m_enum_fmt_mplane,
 562         .vidioc_enum_fmt_vid_out_mplane = gsc_m2m_enum_fmt_mplane,
 563         .vidioc_g_fmt_vid_cap_mplane    = gsc_m2m_g_fmt_mplane,
 564         .vidioc_g_fmt_vid_out_mplane    = gsc_m2m_g_fmt_mplane,
 565         .vidioc_try_fmt_vid_cap_mplane  = gsc_m2m_try_fmt_mplane,
 566         .vidioc_try_fmt_vid_out_mplane  = gsc_m2m_try_fmt_mplane,
 567         .vidioc_s_fmt_vid_cap_mplane    = gsc_m2m_s_fmt_mplane,
 568         .vidioc_s_fmt_vid_out_mplane    = gsc_m2m_s_fmt_mplane,
 569         .vidioc_reqbufs                 = gsc_m2m_reqbufs,
 570         .vidioc_expbuf                  = gsc_m2m_expbuf,
 571         .vidioc_querybuf                = gsc_m2m_querybuf,
 572         .vidioc_qbuf                    = gsc_m2m_qbuf,
 573         .vidioc_dqbuf                   = gsc_m2m_dqbuf,
 574         .vidioc_streamon                = gsc_m2m_streamon,
 575         .vidioc_streamoff               = gsc_m2m_streamoff,
 576         .vidioc_g_selection             = gsc_m2m_g_selection,
 577         .vidioc_s_selection             = gsc_m2m_s_selection
 578 };
 579
 580 static int queue_init(void *priv, struct vb2_queue *src_vq,
 581                         struct vb2_queue *dst_vq)
 582 {
 583         struct gsc_ctx *ctx = priv;
 584         int ret;
 585
 586         memset(src_vq, 0, sizeof(*src_vq));
 587         src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
 588         src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
 589         src_vq->drv_priv = ctx;
 590         src_vq->ops = &gsc_m2m_qops;
 591         src_vq->mem_ops = &vb2_dma_contig_memops;
 592         src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
 593         src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
 594         src_vq->lock = &ctx->gsc_dev->lock;
 595
 596         ret = vb2_queue_init(src_vq);
 597         if (ret)
 598                 return ret;
 599
 600         memset(dst_vq, 0, sizeof(*dst_vq));
 601         dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
 602         dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
 603         dst_vq->drv_priv = ctx;
 604         dst_vq->ops = &gsc_m2m_qops;
 605         dst_vq->mem_ops = &vb2_dma_contig_memops;
 606         dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
 607         dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
 608         dst_vq->lock = &ctx->gsc_dev->lock;
 609
 610         return vb2_queue_init(dst_vq);
 611 }
 612
 613 static int gsc_m2m_open(struct file *file)
 614 {
 615         struct gsc_dev *gsc = video_drvdata(file);
 616         struct gsc_ctx *ctx = NULL;
 617         int ret;
 618
 619         pr_debug("pid: %d, state: 0x%lx", task_pid_nr(current), gsc->state);
 620
 621         if (mutex_lock_interruptible(&gsc->lock))
 622                 return -ERESTARTSYS;
 623
 624         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 625         if (!ctx) {
 626                 ret = -ENOMEM;
 627                 goto unlock;
 628         }
 629
 630         v4l2_fh_init(&ctx->fh, gsc->m2m.vfd);
 631         ret = gsc_ctrls_create(ctx);
 632         if (ret)
 633                 goto error_fh;
 634
 635         /* Use separate control handler per file handle */
 636         ctx->fh.ctrl_handler = &ctx->ctrl_handler;
 637         file->private_data = &ctx->fh;
 638         v4l2_fh_add(&ctx->fh);
 639
 640         ctx->gsc_dev = gsc;
 641         /* Default color format */
 642         ctx->s_frame.fmt = get_format(0);
 643         ctx->d_frame.fmt = get_format(0);
 644         /* Setup the device context for mem2mem mode. */
 645         ctx->state = GSC_CTX_M2M;
 646         ctx->flags = 0;
 647         ctx->in_path = GSC_DMA;
 648         ctx->out_path = GSC_DMA;
 649
 650         ctx->m2m_ctx = v4l2_m2m_ctx_init(gsc->m2m.m2m_dev, ctx, queue_init);
 651         if (IS_ERR(ctx->m2m_ctx)) {
 652                 pr_err("Failed to initialize m2m context");
 653                 ret = PTR_ERR(ctx->m2m_ctx);
 654                 goto error_ctrls;
 655         }
 656
 657         if (gsc->m2m.refcnt++ == 0)
 658                 set_bit(ST_M2M_OPEN, &gsc->state);
 659
 660         pr_debug("gsc m2m driver is opened, ctx(0x%p)", ctx);
 661
 662         mutex_unlock(&gsc->lock);
 663         return 0;
 664
 665 error_ctrls:
 666         gsc_ctrls_delete(ctx);
 667 error_fh:
 668         v4l2_fh_del(&ctx->fh);
 669         v4l2_fh_exit(&ctx->fh);
 670         kfree(ctx);
 671 unlock:
 672         mutex_unlock(&gsc->lock);
 673         return ret;
 674 }
 675
 676 static int gsc_m2m_release(struct file *file)
 677 {
 678         struct gsc_ctx *ctx = fh_to_ctx(file->private_data);
 679         struct gsc_dev *gsc = ctx->gsc_dev;
 680
 681         pr_debug("pid: %d, state: 0x%lx, refcnt= %d",
 682                 task_pid_nr(current), gsc->state, gsc->m2m.refcnt);
 683
 684         mutex_lock(&gsc->lock);
 685
 686         v4l2_m2m_ctx_release(ctx->m2m_ctx);
 687         gsc_ctrls_delete(ctx);
 688         v4l2_fh_del(&ctx->fh);
 689         v4l2_fh_exit(&ctx->fh);
 690
 691         if (--gsc->m2m.refcnt <= 0)
 692                 clear_bit(ST_M2M_OPEN, &gsc->state);
 693         kfree(ctx);
 694
 695         mutex_unlock(&gsc->lock);
 696         return 0;
 697 }
 698
 699 static unsigned int gsc_m2m_poll(struct file *file,
 700                                         struct poll_table_struct *wait)
 701 {
 702         struct gsc_ctx *ctx = fh_to_ctx(file->private_data);
 703         struct gsc_dev *gsc = ctx->gsc_dev;
 704         int ret;
 705
 706         if (mutex_lock_interruptible(&gsc->lock))
 707                 return -ERESTARTSYS;
 708
 709         ret = v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
 710         mutex_unlock(&gsc->lock);
 711
 712         return ret;
 713 }
 714
 715 static int gsc_m2m_mmap(struct file *file, struct vm_area_struct *vma)
 716 {
 717         struct gsc_ctx *ctx = fh_to_ctx(file->private_data);
 718         struct gsc_dev *gsc = ctx->gsc_dev;
 719         int ret;
 720
 721         if (mutex_lock_interruptible(&gsc->lock))
 722                 return -ERESTARTSYS;
 723
 724         ret = v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
 725         mutex_unlock(&gsc->lock);
 726
 727         return ret;
 728 }
 729
 730 static const struct v4l2_file_operations gsc_m2m_fops = {
 731         .owner          = THIS_MODULE,
 732         .open           = gsc_m2m_open,
 733         .release        = gsc_m2m_release,
 734         .poll           = gsc_m2m_poll,
 735         .unlocked_ioctl = video_ioctl2,
 736         .mmap           = gsc_m2m_mmap,
 737 };
 738
 739 static struct v4l2_m2m_ops gsc_m2m_ops = {
 740         .device_run     = gsc_m2m_device_run,
 741         .job_abort      = gsc_m2m_job_abort,
 742 };
 743
 744 int gsc_register_m2m_device(struct gsc_dev *gsc)
 745 {
 746         struct platform_device *pdev;
 747         int ret;
 748
 749         if (!gsc)
 750                 return -ENODEV;
 751
 752         pdev = gsc->pdev;
 753
 754         gsc->vdev.fops          = &gsc_m2m_fops;
 755         gsc->vdev.ioctl_ops     = &gsc_m2m_ioctl_ops;
 756         gsc->vdev.release       = video_device_release_empty;
 757         gsc->vdev.lock          = &gsc->lock;
 758         gsc->vdev.vfl_dir       = VFL_DIR_M2M;
 759         gsc->vdev.v4l2_dev      = &gsc->v4l2_dev;
 760         snprintf(gsc->vdev.name, sizeof(gsc->vdev.name), "%s.%d:m2m",
 761                                         GSC_MODULE_NAME, gsc->id);
 762
 763         video_set_drvdata(&gsc->vdev, gsc);
 764
 765         gsc->m2m.vfd = &gsc->vdev;
 766         gsc->m2m.m2m_dev = v4l2_m2m_init(&gsc_m2m_ops);
 767         if (IS_ERR(gsc->m2m.m2m_dev)) {
 768                 dev_err(&pdev->dev, "failed to initialize v4l2-m2m device\n");
 769                 ret = PTR_ERR(gsc->m2m.m2m_dev);
 770                 goto err_m2m_r1;
 771         }
 772
 773         ret = video_register_device(&gsc->vdev, VFL_TYPE_GRABBER, -1);
 774         if (ret) {
 775                 dev_err(&pdev->dev,
 776                          "%s(): failed to register video device\n", __func__);
 777                 goto err_m2m_r2;
 778         }
 779
 780         pr_debug("gsc m2m driver registered as /dev/video%d", gsc->vdev.num);
 781         return 0;
 782
 783 err_m2m_r2:
 784         v4l2_m2m_release(gsc->m2m.m2m_dev);
 785 err_m2m_r1:
 786         video_device_release(gsc->m2m.vfd);
 787
 788         return ret;
 789 }
 790
 791 void gsc_unregister_m2m_device(struct gsc_dev *gsc)
 792 {
 793         if (gsc)
 794                 v4l2_m2m_release(gsc->m2m.m2m_dev);
 795 }