drivers/media/platform/stm32/stm32-dcmi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for STM32 Digital Camera Memory Interface
   4  *
   5  * Copyright (C) STMicroelectronics SA 2017
   6  * Authors: Yannick Fertre <yannick.fertre@st.com>
   7  *          Hugues Fruchet <hugues.fruchet@st.com>
   8  *          for STMicroelectronics.
   9  *
  10  * This driver is based on atmel_isi.c
  11  *
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/completion.h>
  16 #include <linux/delay.h>
  17 #include <linux/dmaengine.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/of_graph.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/reset.h>
  27 #include <linux/videodev2.h>
  28
  29 #include <media/v4l2-ctrls.h>
  30 #include <media/v4l2-dev.h>
  31 #include <media/v4l2-device.h>
  32 #include <media/v4l2-event.h>
  33 #include <media/v4l2-fwnode.h>
  34 #include <media/v4l2-image-sizes.h>
  35 #include <media/v4l2-ioctl.h>
  36 #include <media/v4l2-rect.h>
  37 #include <media/videobuf2-dma-contig.h>
  38
  39 #define DRV_NAME "stm32-dcmi"
  40
  41 /* Registers offset for DCMI */
  42 #define DCMI_CR         0x00 /* Control Register */
  43 #define DCMI_SR         0x04 /* Status Register */
  44 #define DCMI_RIS        0x08 /* Raw Interrupt Status register */
  45 #define DCMI_IER        0x0C /* Interrupt Enable Register */
  46 #define DCMI_MIS        0x10 /* Masked Interrupt Status register */
  47 #define DCMI_ICR        0x14 /* Interrupt Clear Register */
  48 #define DCMI_ESCR       0x18 /* Embedded Synchronization Code Register */
  49 #define DCMI_ESUR       0x1C /* Embedded Synchronization Unmask Register */
  50 #define DCMI_CWSTRT     0x20 /* Crop Window STaRT */
  51 #define DCMI_CWSIZE     0x24 /* Crop Window SIZE */
  52 #define DCMI_DR         0x28 /* Data Register */
  53 #define DCMI_IDR        0x2C /* IDentifier Register */
  54
  55 /* Bits definition for control register (DCMI_CR) */
  56 #define CR_CAPTURE      BIT(0)
  57 #define CR_CM           BIT(1)
  58 #define CR_CROP         BIT(2)
  59 #define CR_JPEG         BIT(3)
  60 #define CR_ESS          BIT(4)
  61 #define CR_PCKPOL       BIT(5)
  62 #define CR_HSPOL        BIT(6)
  63 #define CR_VSPOL        BIT(7)
  64 #define CR_FCRC_0       BIT(8)
  65 #define CR_FCRC_1       BIT(9)
  66 #define CR_EDM_0        BIT(10)
  67 #define CR_EDM_1        BIT(11)
  68 #define CR_ENABLE       BIT(14)
  69
  70 /* Bits definition for status register (DCMI_SR) */
  71 #define SR_HSYNC        BIT(0)
  72 #define SR_VSYNC        BIT(1)
  73 #define SR_FNE          BIT(2)
  74
  75 /*
  76  * Bits definition for interrupt registers
  77  * (DCMI_RIS, DCMI_IER, DCMI_MIS, DCMI_ICR)
  78  */
  79 #define IT_FRAME        BIT(0)
  80 #define IT_OVR          BIT(1)
  81 #define IT_ERR          BIT(2)
  82 #define IT_VSYNC        BIT(3)
  83 #define IT_LINE         BIT(4)
  84
  85 enum state {
  86         STOPPED = 0,
  87         WAIT_FOR_BUFFER,
  88         RUNNING,
  89         STOPPING,
  90 };
  91
  92 #define MIN_WIDTH       16U
  93 #define MAX_WIDTH       2592U
  94 #define MIN_HEIGHT      16U
  95 #define MAX_HEIGHT      2592U
  96
  97 #define TIMEOUT_MS      1000
  98
  99 struct dcmi_graph_entity {
 100         struct device_node *node;
 101
 102         struct v4l2_async_subdev asd;
 103         struct v4l2_subdev *subdev;
 104 };
 105
 106 struct dcmi_format {
 107         u32     fourcc;
 108         u32     mbus_code;
 109         u8      bpp;
 110 };
 111
 112 struct dcmi_framesize {
 113         u32     width;
 114         u32     height;
 115 };
 116
 117 struct dcmi_buf {
 118         struct vb2_v4l2_buffer  vb;
 119         bool                    prepared;
 120         dma_addr_t              paddr;
 121         size_t                  size;
 122         struct list_head        list;
 123 };
 124
 125 struct stm32_dcmi {
 126         /* Protects the access of variables shared within the interrupt */
 127         spinlock_t                      irqlock;
 128         struct device                   *dev;
 129         void __iomem                    *regs;
 130         struct resource                 *res;
 131         struct reset_control            *rstc;
 132         int                             sequence;
 133         struct list_head                buffers;
 134         struct dcmi_buf                 *active;
 135
 136         struct v4l2_device              v4l2_dev;
 137         struct video_device             *vdev;
 138         struct v4l2_async_notifier      notifier;
 139         struct dcmi_graph_entity        entity;
 140         struct v4l2_format              fmt;
 141         struct v4l2_rect                crop;
 142         bool                            do_crop;
 143
 144         const struct dcmi_format        **sd_formats;
 145         unsigned int                    num_of_sd_formats;
 146         const struct dcmi_format        *sd_format;
 147         struct dcmi_framesize           *sd_framesizes;
 148         unsigned int                    num_of_sd_framesizes;
 149         struct dcmi_framesize           sd_framesize;
 150         struct v4l2_rect                sd_bounds;
 151
 152         /* Protect this data structure */
 153         struct mutex                    lock;
 154         struct vb2_queue                queue;
 155
 156         struct v4l2_fwnode_bus_parallel bus;
 157         struct completion               complete;
 158         struct clk                      *mclk;
 159         enum state                      state;
 160         struct dma_chan                 *dma_chan;
 161         dma_cookie_t                    dma_cookie;
 162         u32                             misr;
 163         int                             errors_count;
 164         int                             overrun_count;
 165         int                             buffers_count;
 166 };
 167
 168 static inline struct stm32_dcmi *notifier_to_dcmi(struct v4l2_async_notifier *n)
 169 {
 170         return container_of(n, struct stm32_dcmi, notifier);
 171 }
 172
 173 static inline u32 reg_read(void __iomem *base, u32 reg)
 174 {
 175         return readl_relaxed(base + reg);
 176 }
 177
 178 static inline void reg_write(void __iomem *base, u32 reg, u32 val)
 179 {
 180         writel_relaxed(val, base + reg);
 181 }
 182
 183 static inline void reg_set(void __iomem *base, u32 reg, u32 mask)
 184 {
 185         reg_write(base, reg, reg_read(base, reg) | mask);
 186 }
 187
 188 static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
 189 {
 190         reg_write(base, reg, reg_read(base, reg) & ~mask);
 191 }
 192
 193 static int dcmi_start_capture(struct stm32_dcmi *dcmi, struct dcmi_buf *buf);
 194
 195 static void dcmi_buffer_done(struct stm32_dcmi *dcmi,
 196                              struct dcmi_buf *buf,
 197                              size_t bytesused,
 198                              int err)
 199 {
 200         struct vb2_v4l2_buffer *vbuf;
 201
 202         if (!buf)
 203                 return;
 204
 205         list_del_init(&buf->list);
 206
 207         vbuf = &buf->vb;
 208
 209         vbuf->sequence = dcmi->sequence++;
 210         vbuf->field = V4L2_FIELD_NONE;
 211         vbuf->vb2_buf.timestamp = ktime_get_ns();
 212         vb2_set_plane_payload(&vbuf->vb2_buf, 0, bytesused);
 213         vb2_buffer_done(&vbuf->vb2_buf,
 214                         err ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 215         dev_dbg(dcmi->dev, "buffer[%d] done seq=%d, bytesused=%zu\n",
 216                 vbuf->vb2_buf.index, vbuf->sequence, bytesused);
 217
 218         dcmi->buffers_count++;
 219         dcmi->active = NULL;
 220 }
 221
 222 static int dcmi_restart_capture(struct stm32_dcmi *dcmi)
 223 {
 224         struct dcmi_buf *buf;
 225
 226         spin_lock_irq(&dcmi->irqlock);
 227
 228         if (dcmi->state != RUNNING) {
 229                 spin_unlock_irq(&dcmi->irqlock);
 230                 return -EINVAL;
 231         }
 232
 233         /* Restart a new DMA transfer with next buffer */
 234         if (list_empty(&dcmi->buffers)) {
 235                 dev_dbg(dcmi->dev, "Capture restart is deferred to next buffer queueing\n");
 236                 dcmi->state = WAIT_FOR_BUFFER;
 237                 spin_unlock_irq(&dcmi->irqlock);
 238                 return 0;
 239         }
 240         buf = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
 241         dcmi->active = buf;
 242
 243         spin_unlock_irq(&dcmi->irqlock);
 244
 245         return dcmi_start_capture(dcmi, buf);
 246 }
 247
 248 static void dcmi_dma_callback(void *param)
 249 {
 250         struct stm32_dcmi *dcmi = (struct stm32_dcmi *)param;
 251         struct dma_tx_state state;
 252         enum dma_status status;
 253         struct dcmi_buf *buf = dcmi->active;
 254
 255         spin_lock_irq(&dcmi->irqlock);
 256
 257         /* Check DMA status */
 258         status = dmaengine_tx_status(dcmi->dma_chan, dcmi->dma_cookie, &state);
 259
 260         switch (status) {
 261         case DMA_IN_PROGRESS:
 262                 dev_dbg(dcmi->dev, "%s: Received DMA_IN_PROGRESS\n", __func__);
 263                 break;
 264         case DMA_PAUSED:
 265                 dev_err(dcmi->dev, "%s: Received DMA_PAUSED\n", __func__);
 266                 break;
 267         case DMA_ERROR:
 268                 dev_err(dcmi->dev, "%s: Received DMA_ERROR\n", __func__);
 269
 270                 /* Return buffer to V4L2 in error state */
 271                 dcmi_buffer_done(dcmi, buf, 0, -EIO);
 272                 break;
 273         case DMA_COMPLETE:
 274                 dev_dbg(dcmi->dev, "%s: Received DMA_COMPLETE\n", __func__);
 275
 276                 /* Return buffer to V4L2 */
 277                 dcmi_buffer_done(dcmi, buf, buf->size, 0);
 278
 279                 spin_unlock_irq(&dcmi->irqlock);
 280
 281                 /* Restart capture */
 282                 if (dcmi_restart_capture(dcmi))
 283                         dev_err(dcmi->dev, "%s: Cannot restart capture on DMA complete\n",
 284                                 __func__);
 285                 return;
 286         default:
 287                 dev_err(dcmi->dev, "%s: Received unknown status\n", __func__);
 288                 break;
 289         }
 290
 291         spin_unlock_irq(&dcmi->irqlock);
 292 }
 293
 294 static int dcmi_start_dma(struct stm32_dcmi *dcmi,
 295                           struct dcmi_buf *buf)
 296 {
 297         struct dma_async_tx_descriptor *desc = NULL;
 298         struct dma_slave_config config;
 299         int ret;
 300
 301         memset(&config, 0, sizeof(config));
 302
 303         config.src_addr = (dma_addr_t)dcmi->res->start + DCMI_DR;
 304         config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 305         config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 306         config.dst_maxburst = 4;
 307
 308         /* Configure DMA channel */
 309         ret = dmaengine_slave_config(dcmi->dma_chan, &config);
 310         if (ret < 0) {
 311                 dev_err(dcmi->dev, "%s: DMA channel config failed (%d)\n",
 312                         __func__, ret);
 313                 return ret;
 314         }
 315
 316         /* Prepare a DMA transaction */
 317         desc = dmaengine_prep_slave_single(dcmi->dma_chan, buf->paddr,
 318                                            buf->size,
 319                                            DMA_DEV_TO_MEM,
 320                                            DMA_PREP_INTERRUPT);
 321         if (!desc) {
 322                 dev_err(dcmi->dev, "%s: DMA dmaengine_prep_slave_single failed for buffer phy=%pad size=%zu\n",
 323                         __func__, &buf->paddr, buf->size);
 324                 return -EINVAL;
 325         }
 326
 327         /* Set completion callback routine for notification */
 328         desc->callback = dcmi_dma_callback;
 329         desc->callback_param = dcmi;
 330
 331         /* Push current DMA transaction in the pending queue */
 332         dcmi->dma_cookie = dmaengine_submit(desc);
 333         if (dma_submit_error(dcmi->dma_cookie)) {
 334                 dev_err(dcmi->dev, "%s: DMA submission failed\n", __func__);
 335                 return -ENXIO;
 336         }
 337
 338         dma_async_issue_pending(dcmi->dma_chan);
 339
 340         return 0;
 341 }
 342
 343 static int dcmi_start_capture(struct stm32_dcmi *dcmi, struct dcmi_buf *buf)
 344 {
 345         int ret;
 346
 347         if (!buf)
 348                 return -EINVAL;
 349
 350         ret = dcmi_start_dma(dcmi, buf);
 351         if (ret) {
 352                 dcmi->errors_count++;
 353                 return ret;
 354         }
 355
 356         /* Enable capture */
 357         reg_set(dcmi->regs, DCMI_CR, CR_CAPTURE);
 358
 359         return 0;
 360 }
 361
 362 static void dcmi_set_crop(struct stm32_dcmi *dcmi)
 363 {
 364         u32 size, start;
 365
 366         /* Crop resolution */
 367         size = ((dcmi->crop.height - 1) << 16) |
 368                 ((dcmi->crop.width << 1) - 1);
 369         reg_write(dcmi->regs, DCMI_CWSIZE, size);
 370
 371         /* Crop start point */
 372         start = ((dcmi->crop.top) << 16) |
 373                  ((dcmi->crop.left << 1));
 374         reg_write(dcmi->regs, DCMI_CWSTRT, start);
 375
 376         dev_dbg(dcmi->dev, "Cropping to %ux%u@%u:%u\n",
 377                 dcmi->crop.width, dcmi->crop.height,
 378                 dcmi->crop.left, dcmi->crop.top);
 379
 380         /* Enable crop */
 381         reg_set(dcmi->regs, DCMI_CR, CR_CROP);
 382 }
 383
 384 static void dcmi_process_jpeg(struct stm32_dcmi *dcmi)
 385 {
 386         struct dma_tx_state state;
 387         enum dma_status status;
 388         struct dcmi_buf *buf = dcmi->active;
 389
 390         if (!buf)
 391                 return;
 392
 393         /*
 394          * Because of variable JPEG buffer size sent by sensor,
 395          * DMA transfer never completes due to transfer size never reached.
 396          * In order to ensure that all the JPEG data are transferred
 397          * in active buffer memory, DMA is drained.
 398          * Then DMA tx status gives the amount of data transferred
 399          * to memory, which is then returned to V4L2 through the active
 400          * buffer payload.
 401          */
 402
 403         /* Drain DMA */
 404         dmaengine_synchronize(dcmi->dma_chan);
 405
 406         /* Get DMA residue to get JPEG size */
 407         status = dmaengine_tx_status(dcmi->dma_chan, dcmi->dma_cookie, &state);
 408         if (status != DMA_ERROR && state.residue < buf->size) {
 409                 /* Return JPEG buffer to V4L2 with received JPEG buffer size */
 410                 dcmi_buffer_done(dcmi, buf, buf->size - state.residue, 0);
 411         } else {
 412                 dcmi->errors_count++;
 413                 dev_err(dcmi->dev, "%s: Cannot get JPEG size from DMA\n",
 414                         __func__);
 415                 /* Return JPEG buffer to V4L2 in ERROR state */
 416                 dcmi_buffer_done(dcmi, buf, 0, -EIO);
 417         }
 418
 419         /* Abort DMA operation */
 420         dmaengine_terminate_all(dcmi->dma_chan);
 421
 422         /* Restart capture */
 423         if (dcmi_restart_capture(dcmi))
 424                 dev_err(dcmi->dev, "%s: Cannot restart capture on JPEG received\n",
 425                         __func__);
 426 }
 427
 428 static irqreturn_t dcmi_irq_thread(int irq, void *arg)
 429 {
 430         struct stm32_dcmi *dcmi = arg;
 431
 432         spin_lock_irq(&dcmi->irqlock);
 433
 434         /* Stop capture is required */
 435         if (dcmi->state == STOPPING) {
 436                 reg_clear(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 437
 438                 dcmi->state = STOPPED;
 439
 440                 complete(&dcmi->complete);
 441
 442                 spin_unlock_irq(&dcmi->irqlock);
 443                 return IRQ_HANDLED;
 444         }
 445
 446         if ((dcmi->misr & IT_OVR) || (dcmi->misr & IT_ERR)) {
 447                 dcmi->errors_count++;
 448                 if (dcmi->misr & IT_OVR)
 449                         dcmi->overrun_count++;
 450         }
 451
 452         if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG &&
 453             dcmi->misr & IT_FRAME) {
 454                 /* JPEG received */
 455                 spin_unlock_irq(&dcmi->irqlock);
 456                 dcmi_process_jpeg(dcmi);
 457                 return IRQ_HANDLED;
 458         }
 459
 460         spin_unlock_irq(&dcmi->irqlock);
 461         return IRQ_HANDLED;
 462 }
 463
 464 static irqreturn_t dcmi_irq_callback(int irq, void *arg)
 465 {
 466         struct stm32_dcmi *dcmi = arg;
 467         unsigned long flags;
 468
 469         spin_lock_irqsave(&dcmi->irqlock, flags);
 470
 471         dcmi->misr = reg_read(dcmi->regs, DCMI_MIS);
 472
 473         /* Clear interrupt */
 474         reg_set(dcmi->regs, DCMI_ICR, IT_FRAME | IT_OVR | IT_ERR);
 475
 476         spin_unlock_irqrestore(&dcmi->irqlock, flags);
 477
 478         return IRQ_WAKE_THREAD;
 479 }
 480
 481 static int dcmi_queue_setup(struct vb2_queue *vq,
 482                             unsigned int *nbuffers,
 483                             unsigned int *nplanes,
 484                             unsigned int sizes[],
 485                             struct device *alloc_devs[])
 486 {
 487         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 488         unsigned int size;
 489
 490         size = dcmi->fmt.fmt.pix.sizeimage;
 491
 492         /* Make sure the image size is large enough */
 493         if (*nplanes)
 494                 return sizes[0] < size ? -EINVAL : 0;
 495
 496         *nplanes = 1;
 497         sizes[0] = size;
 498
 499         dev_dbg(dcmi->dev, "Setup queue, count=%d, size=%d\n",
 500                 *nbuffers, size);
 501
 502         return 0;
 503 }
 504
 505 static int dcmi_buf_init(struct vb2_buffer *vb)
 506 {
 507         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 508         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 509
 510         INIT_LIST_HEAD(&buf->list);
 511
 512         return 0;
 513 }
 514
 515 static int dcmi_buf_prepare(struct vb2_buffer *vb)
 516 {
 517         struct stm32_dcmi *dcmi =  vb2_get_drv_priv(vb->vb2_queue);
 518         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 519         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 520         unsigned long size;
 521
 522         size = dcmi->fmt.fmt.pix.sizeimage;
 523
 524         if (vb2_plane_size(vb, 0) < size) {
 525                 dev_err(dcmi->dev, "%s data will not fit into plane (%lu < %lu)\n",
 526                         __func__, vb2_plane_size(vb, 0), size);
 527                 return -EINVAL;
 528         }
 529
 530         vb2_set_plane_payload(vb, 0, size);
 531
 532         if (!buf->prepared) {
 533                 /* Get memory addresses */
 534                 buf->paddr =
 535                         vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
 536                 buf->size = vb2_plane_size(&buf->vb.vb2_buf, 0);
 537                 buf->prepared = true;
 538
 539                 vb2_set_plane_payload(&buf->vb.vb2_buf, 0, buf->size);
 540
 541                 dev_dbg(dcmi->dev, "buffer[%d] phy=%pad size=%zu\n",
 542                         vb->index, &buf->paddr, buf->size);
 543         }
 544
 545         return 0;
 546 }
 547
 548 static void dcmi_buf_queue(struct vb2_buffer *vb)
 549 {
 550         struct stm32_dcmi *dcmi =  vb2_get_drv_priv(vb->vb2_queue);
 551         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 552         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 553
 554         spin_lock_irq(&dcmi->irqlock);
 555
 556         /* Enqueue to video buffers list */
 557         list_add_tail(&buf->list, &dcmi->buffers);
 558
 559         if (dcmi->state == WAIT_FOR_BUFFER) {
 560                 dcmi->state = RUNNING;
 561                 dcmi->active = buf;
 562
 563                 dev_dbg(dcmi->dev, "Starting capture on buffer[%d] queued\n",
 564                         buf->vb.vb2_buf.index);
 565
 566                 spin_unlock_irq(&dcmi->irqlock);
 567                 if (dcmi_start_capture(dcmi, buf))
 568                         dev_err(dcmi->dev, "%s: Cannot restart capture on overflow or error\n",
 569                                 __func__);
 570                 return;
 571         }
 572
 573         spin_unlock_irq(&dcmi->irqlock);
 574 }
 575
 576 static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
 577 {
 578         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 579         struct dcmi_buf *buf, *node;
 580         u32 val = 0;
 581         int ret;
 582
 583         ret = clk_enable(dcmi->mclk);
 584         if (ret) {
 585                 dev_err(dcmi->dev, "%s: Failed to start streaming, cannot enable clock\n",
 586                         __func__);
 587                 goto err_release_buffers;
 588         }
 589
 590         /* Enable stream on the sub device */
 591         ret = v4l2_subdev_call(dcmi->entity.subdev, video, s_stream, 1);
 592         if (ret && ret != -ENOIOCTLCMD) {
 593                 dev_err(dcmi->dev, "%s: Failed to start streaming, subdev streamon error",
 594                         __func__);
 595                 goto err_disable_clock;
 596         }
 597
 598         spin_lock_irq(&dcmi->irqlock);
 599
 600         /* Set bus width */
 601         switch (dcmi->bus.bus_width) {
 602         case 14:
 603                 val |= CR_EDM_0 | CR_EDM_1;
 604                 break;
 605         case 12:
 606                 val |= CR_EDM_1;
 607                 break;
 608         case 10:
 609                 val |= CR_EDM_0;
 610                 break;
 611         default:
 612                 /* Set bus width to 8 bits by default */
 613                 break;
 614         }
 615
 616         /* Set vertical synchronization polarity */
 617         if (dcmi->bus.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
 618                 val |= CR_VSPOL;
 619
 620         /* Set horizontal synchronization polarity */
 621         if (dcmi->bus.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
 622                 val |= CR_HSPOL;
 623
 624         /* Set pixel clock polarity */
 625         if (dcmi->bus.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
 626                 val |= CR_PCKPOL;
 627
 628         reg_write(dcmi->regs, DCMI_CR, val);
 629
 630         /* Set crop */
 631         if (dcmi->do_crop)
 632                 dcmi_set_crop(dcmi);
 633
 634         /* Enable jpeg capture */
 635         if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG)
 636                 reg_set(dcmi->regs, DCMI_CR, CR_CM);/* Snapshot mode */
 637
 638         /* Enable dcmi */
 639         reg_set(dcmi->regs, DCMI_CR, CR_ENABLE);
 640
 641         dcmi->sequence = 0;
 642         dcmi->errors_count = 0;
 643         dcmi->overrun_count = 0;
 644         dcmi->buffers_count = 0;
 645
 646         /*
 647          * Start transfer if at least one buffer has been queued,
 648          * otherwise transfer is deferred at buffer queueing
 649          */
 650         if (list_empty(&dcmi->buffers)) {
 651                 dev_dbg(dcmi->dev, "Start streaming is deferred to next buffer queueing\n");
 652                 dcmi->state = WAIT_FOR_BUFFER;
 653                 spin_unlock_irq(&dcmi->irqlock);
 654                 return 0;
 655         }
 656
 657         buf = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
 658         dcmi->active = buf;
 659
 660         dcmi->state = RUNNING;
 661
 662         dev_dbg(dcmi->dev, "Start streaming, starting capture\n");
 663
 664         spin_unlock_irq(&dcmi->irqlock);
 665         ret = dcmi_start_capture(dcmi, buf);
 666         if (ret) {
 667                 dev_err(dcmi->dev, "%s: Start streaming failed, cannot start capture\n",
 668                         __func__);
 669                 goto err_subdev_streamoff;
 670         }
 671
 672         /* Enable interruptions */
 673         reg_set(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 674
 675         return 0;
 676
 677 err_subdev_streamoff:
 678         v4l2_subdev_call(dcmi->entity.subdev, video, s_stream, 0);
 679
 680 err_disable_clock:
 681         clk_disable(dcmi->mclk);
 682
 683 err_release_buffers:
 684         spin_lock_irq(&dcmi->irqlock);
 685         /*
 686          * Return all buffers to vb2 in QUEUED state.
 687          * This will give ownership back to userspace
 688          */
 689         list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
 690                 list_del_init(&buf->list);
 691                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
 692         }
 693         dcmi->active = NULL;
 694         spin_unlock_irq(&dcmi->irqlock);
 695
 696         return ret;
 697 }
 698
 699 static void dcmi_stop_streaming(struct vb2_queue *vq)
 700 {
 701         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 702         struct dcmi_buf *buf, *node;
 703         unsigned long time_ms = msecs_to_jiffies(TIMEOUT_MS);
 704         long timeout;
 705         int ret;
 706
 707         /* Disable stream on the sub device */
 708         ret = v4l2_subdev_call(dcmi->entity.subdev, video, s_stream, 0);
 709         if (ret && ret != -ENOIOCTLCMD)
 710                 dev_err(dcmi->dev, "%s: Failed to stop streaming, subdev streamoff error (%d)\n",
 711                         __func__, ret);
 712
 713         spin_lock_irq(&dcmi->irqlock);
 714         dcmi->state = STOPPING;
 715         spin_unlock_irq(&dcmi->irqlock);
 716
 717         timeout = wait_for_completion_interruptible_timeout(&dcmi->complete,
 718                                                             time_ms);
 719
 720         spin_lock_irq(&dcmi->irqlock);
 721
 722         /* Disable interruptions */
 723         reg_clear(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 724
 725         /* Disable DCMI */
 726         reg_clear(dcmi->regs, DCMI_CR, CR_ENABLE);
 727
 728         if (!timeout) {
 729                 dev_err(dcmi->dev, "%s: Timeout during stop streaming\n",
 730                         __func__);
 731                 dcmi->state = STOPPED;
 732         }
 733
 734         /* Return all queued buffers to vb2 in ERROR state */
 735         list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
 736                 list_del_init(&buf->list);
 737                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 738         }
 739
 740         dcmi->active = NULL;
 741
 742         spin_unlock_irq(&dcmi->irqlock);
 743
 744         /* Stop all pending DMA operations */
 745         dmaengine_terminate_all(dcmi->dma_chan);
 746
 747         clk_disable(dcmi->mclk);
 748
 749         if (dcmi->errors_count)
 750                 dev_warn(dcmi->dev, "Some errors found while streaming: errors=%d (overrun=%d), buffers=%d\n",
 751                          dcmi->errors_count, dcmi->overrun_count,
 752                          dcmi->buffers_count);
 753         dev_dbg(dcmi->dev, "Stop streaming, errors=%d (overrun=%d), buffers=%d\n",
 754                 dcmi->errors_count, dcmi->overrun_count,
 755                 dcmi->buffers_count);
 756 }
 757
 758 static const struct vb2_ops dcmi_video_qops = {
 759         .queue_setup            = dcmi_queue_setup,
 760         .buf_init               = dcmi_buf_init,
 761         .buf_prepare            = dcmi_buf_prepare,
 762         .buf_queue              = dcmi_buf_queue,
 763         .start_streaming        = dcmi_start_streaming,
 764         .stop_streaming         = dcmi_stop_streaming,
 765         .wait_prepare           = vb2_ops_wait_prepare,
 766         .wait_finish            = vb2_ops_wait_finish,
 767 };
 768
 769 static int dcmi_g_fmt_vid_cap(struct file *file, void *priv,
 770                               struct v4l2_format *fmt)
 771 {
 772         struct stm32_dcmi *dcmi = video_drvdata(file);
 773
 774         *fmt = dcmi->fmt;
 775
 776         return 0;
 777 }
 778
 779 static const struct dcmi_format *find_format_by_fourcc(struct stm32_dcmi *dcmi,
 780                                                        unsigned int fourcc)
 781 {
 782         unsigned int num_formats = dcmi->num_of_sd_formats;
 783         const struct dcmi_format *fmt;
 784         unsigned int i;
 785
 786         for (i = 0; i < num_formats; i++) {
 787                 fmt = dcmi->sd_formats[i];
 788                 if (fmt->fourcc == fourcc)
 789                         return fmt;
 790         }
 791
 792         return NULL;
 793 }
 794
 795 static void __find_outer_frame_size(struct stm32_dcmi *dcmi,
 796                                     struct v4l2_pix_format *pix,
 797                                     struct dcmi_framesize *framesize)
 798 {
 799         struct dcmi_framesize *match = NULL;
 800         unsigned int i;
 801         unsigned int min_err = UINT_MAX;
 802
 803         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
 804                 struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
 805                 int w_err = (fsize->width - pix->width);
 806                 int h_err = (fsize->height - pix->height);
 807                 int err = w_err + h_err;
 808
 809                 if (w_err >= 0 && h_err >= 0 && err < min_err) {
 810                         min_err = err;
 811                         match = fsize;
 812                 }
 813         }
 814         if (!match)
 815                 match = &dcmi->sd_framesizes[0];
 816
 817         *framesize = *match;
 818 }
 819
 820 static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
 821                         const struct dcmi_format **sd_format,
 822                         struct dcmi_framesize *sd_framesize)
 823 {
 824         const struct dcmi_format *sd_fmt;
 825         struct dcmi_framesize sd_fsize;
 826         struct v4l2_pix_format *pix = &f->fmt.pix;
 827         struct v4l2_subdev_pad_config pad_cfg;
 828         struct v4l2_subdev_format format = {
 829                 .which = V4L2_SUBDEV_FORMAT_TRY,
 830         };
 831         bool do_crop;
 832         int ret;
 833
 834         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
 835         if (!sd_fmt) {
 836                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
 837                 pix->pixelformat = sd_fmt->fourcc;
 838         }
 839
 840         /* Limit to hardware capabilities */
 841         pix->width = clamp(pix->width, MIN_WIDTH, MAX_WIDTH);
 842         pix->height = clamp(pix->height, MIN_HEIGHT, MAX_HEIGHT);
 843
 844         /* No crop if JPEG is requested */
 845         do_crop = dcmi->do_crop && (pix->pixelformat != V4L2_PIX_FMT_JPEG);
 846
 847         if (do_crop && dcmi->num_of_sd_framesizes) {
 848                 struct dcmi_framesize outer_sd_fsize;
 849                 /*
 850                  * If crop is requested and sensor have discrete frame sizes,
 851                  * select the frame size that is just larger than request
 852                  */
 853                 __find_outer_frame_size(dcmi, pix, &outer_sd_fsize);
 854                 pix->width = outer_sd_fsize.width;
 855                 pix->height = outer_sd_fsize.height;
 856         }
 857
 858         v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
 859         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, set_fmt,
 860                                &pad_cfg, &format);
 861         if (ret < 0)
 862                 return ret;
 863
 864         /* Update pix regarding to what sensor can do */
 865         v4l2_fill_pix_format(pix, &format.format);
 866
 867         /* Save resolution that sensor can actually do */
 868         sd_fsize.width = pix->width;
 869         sd_fsize.height = pix->height;
 870
 871         if (do_crop) {
 872                 struct v4l2_rect c = dcmi->crop;
 873                 struct v4l2_rect max_rect;
 874
 875                 /*
 876                  * Adjust crop by making the intersection between
 877                  * format resolution request and crop request
 878                  */
 879                 max_rect.top = 0;
 880                 max_rect.left = 0;
 881                 max_rect.width = pix->width;
 882                 max_rect.height = pix->height;
 883                 v4l2_rect_map_inside(&c, &max_rect);
 884                 c.top  = clamp_t(s32, c.top, 0, pix->height - c.height);
 885                 c.left = clamp_t(s32, c.left, 0, pix->width - c.width);
 886                 dcmi->crop = c;
 887
 888                 /* Adjust format resolution request to crop */
 889                 pix->width = dcmi->crop.width;
 890                 pix->height = dcmi->crop.height;
 891         }
 892
 893         pix->field = V4L2_FIELD_NONE;
 894         pix->bytesperline = pix->width * sd_fmt->bpp;
 895         pix->sizeimage = pix->bytesperline * pix->height;
 896
 897         if (sd_format)
 898                 *sd_format = sd_fmt;
 899         if (sd_framesize)
 900                 *sd_framesize = sd_fsize;
 901
 902         return 0;
 903 }
 904
 905 static int dcmi_set_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f)
 906 {
 907         struct v4l2_subdev_format format = {
 908                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 909         };
 910         const struct dcmi_format *sd_format;
 911         struct dcmi_framesize sd_framesize;
 912         struct v4l2_mbus_framefmt *mf = &format.format;
 913         struct v4l2_pix_format *pix = &f->fmt.pix;
 914         int ret;
 915
 916         /*
 917          * Try format, fmt.width/height could have been changed
 918          * to match sensor capability or crop request
 919          * sd_format & sd_framesize will contain what subdev
 920          * can do for this request.
 921          */
 922         ret = dcmi_try_fmt(dcmi, f, &sd_format, &sd_framesize);
 923         if (ret)
 924                 return ret;
 925
 926         /* Disable crop if JPEG is requested */
 927         if (pix->pixelformat == V4L2_PIX_FMT_JPEG)
 928                 dcmi->do_crop = false;
 929
 930         /* pix to mbus format */
 931         v4l2_fill_mbus_format(mf, pix,
 932                               sd_format->mbus_code);
 933         mf->width = sd_framesize.width;
 934         mf->height = sd_framesize.height;
 935
 936         ret = v4l2_subdev_call(dcmi->entity.subdev, pad,
 937                                set_fmt, NULL, &format);
 938         if (ret < 0)
 939                 return ret;
 940
 941         dev_dbg(dcmi->dev, "Sensor format set to 0x%x %ux%u\n",
 942                 mf->code, mf->width, mf->height);
 943         dev_dbg(dcmi->dev, "Buffer format set to %4.4s %ux%u\n",
 944                 (char *)&pix->pixelformat,
 945                 pix->width, pix->height);
 946
 947         dcmi->fmt = *f;
 948         dcmi->sd_format = sd_format;
 949         dcmi->sd_framesize = sd_framesize;
 950
 951         return 0;
 952 }
 953
 954 static int dcmi_s_fmt_vid_cap(struct file *file, void *priv,
 955                               struct v4l2_format *f)
 956 {
 957         struct stm32_dcmi *dcmi = video_drvdata(file);
 958
 959         if (vb2_is_streaming(&dcmi->queue))
 960                 return -EBUSY;
 961
 962         return dcmi_set_fmt(dcmi, f);
 963 }
 964
 965 static int dcmi_try_fmt_vid_cap(struct file *file, void *priv,
 966                                 struct v4l2_format *f)
 967 {
 968         struct stm32_dcmi *dcmi = video_drvdata(file);
 969
 970         return dcmi_try_fmt(dcmi, f, NULL, NULL);
 971 }
 972
 973 static int dcmi_enum_fmt_vid_cap(struct file *file, void  *priv,
 974                                  struct v4l2_fmtdesc *f)
 975 {
 976         struct stm32_dcmi *dcmi = video_drvdata(file);
 977
 978         if (f->index >= dcmi->num_of_sd_formats)
 979                 return -EINVAL;
 980
 981         f->pixelformat = dcmi->sd_formats[f->index]->fourcc;
 982         return 0;
 983 }
 984
 985 static int dcmi_get_sensor_format(struct stm32_dcmi *dcmi,
 986                                   struct v4l2_pix_format *pix)
 987 {
 988         struct v4l2_subdev_format fmt = {
 989                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 990         };
 991         int ret;
 992
 993         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, get_fmt, NULL, &fmt);
 994         if (ret)
 995                 return ret;
 996
 997         v4l2_fill_pix_format(pix, &fmt.format);
 998
 999         return 0;
1000 }
1001
1002 static int dcmi_set_sensor_format(struct stm32_dcmi *dcmi,
1003                                   struct v4l2_pix_format *pix)
1004 {
1005         const struct dcmi_format *sd_fmt;
1006         struct v4l2_subdev_format format = {
1007                 .which = V4L2_SUBDEV_FORMAT_TRY,
1008         };
1009         struct v4l2_subdev_pad_config pad_cfg;
1010         int ret;
1011
1012         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
1013         if (!sd_fmt) {
1014                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
1015                 pix->pixelformat = sd_fmt->fourcc;
1016         }
1017
1018         v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
1019         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, set_fmt,
1020                                &pad_cfg, &format);
1021         if (ret < 0)
1022                 return ret;
1023
1024         return 0;
1025 }
1026
1027 static int dcmi_get_sensor_bounds(struct stm32_dcmi *dcmi,
1028                                   struct v4l2_rect *r)
1029 {
1030         struct v4l2_subdev_selection bounds = {
1031                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1032                 .target = V4L2_SEL_TGT_CROP_BOUNDS,
1033         };
1034         unsigned int max_width, max_height, max_pixsize;
1035         struct v4l2_pix_format pix;
1036         unsigned int i;
1037         int ret;
1038
1039         /*
1040          * Get sensor bounds first
1041          */
1042         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, get_selection,
1043                                NULL, &bounds);
1044         if (!ret)
1045                 *r = bounds.r;
1046         if (ret != -ENOIOCTLCMD)
1047                 return ret;
1048
1049         /*
1050          * If selection is not implemented,
1051          * fallback by enumerating sensor frame sizes
1052          * and take the largest one
1053          */
1054         max_width = 0;
1055         max_height = 0;
1056         max_pixsize = 0;
1057         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
1058                 struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
1059                 unsigned int pixsize = fsize->width * fsize->height;
1060
1061                 if (pixsize > max_pixsize) {
1062                         max_pixsize = pixsize;
1063                         max_width = fsize->width;
1064                         max_height = fsize->height;
1065                 }
1066         }
1067         if (max_pixsize > 0) {
1068                 r->top = 0;
1069                 r->left = 0;
1070                 r->width = max_width;
1071                 r->height = max_height;
1072                 return 0;
1073         }
1074
1075         /*
1076          * If frame sizes enumeration is not implemented,
1077          * fallback by getting current sensor frame size
1078          */
1079         ret = dcmi_get_sensor_format(dcmi, &pix);
1080         if (ret)
1081                 return ret;
1082
1083         r->top = 0;
1084         r->left = 0;
1085         r->width = pix.width;
1086         r->height = pix.height;
1087
1088         return 0;
1089 }
1090
1091 static int dcmi_g_selection(struct file *file, void *fh,
1092                             struct v4l2_selection *s)
1093 {
1094         struct stm32_dcmi *dcmi = video_drvdata(file);
1095
1096         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1097                 return -EINVAL;
1098
1099         switch (s->target) {
1100         case V4L2_SEL_TGT_CROP_DEFAULT:
1101         case V4L2_SEL_TGT_CROP_BOUNDS:
1102                 s->r = dcmi->sd_bounds;
1103                 return 0;
1104         case V4L2_SEL_TGT_CROP:
1105                 if (dcmi->do_crop) {
1106                         s->r = dcmi->crop;
1107                 } else {
1108                         s->r.top = 0;
1109                         s->r.left = 0;
1110                         s->r.width = dcmi->fmt.fmt.pix.width;
1111                         s->r.height = dcmi->fmt.fmt.pix.height;
1112                 }
1113                 break;
1114         default:
1115                 return -EINVAL;
1116         }
1117
1118         return 0;
1119 }
1120
1121 static int dcmi_s_selection(struct file *file, void *priv,
1122                             struct v4l2_selection *s)
1123 {
1124         struct stm32_dcmi *dcmi = video_drvdata(file);
1125         struct v4l2_rect r = s->r;
1126         struct v4l2_rect max_rect;
1127         struct v4l2_pix_format pix;
1128
1129         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1130             s->target != V4L2_SEL_TGT_CROP)
1131                 return -EINVAL;
1132
1133         /* Reset sensor resolution to max resolution */
1134         pix.pixelformat = dcmi->fmt.fmt.pix.pixelformat;
1135         pix.width = dcmi->sd_bounds.width;
1136         pix.height = dcmi->sd_bounds.height;
1137         dcmi_set_sensor_format(dcmi, &pix);
1138
1139         /*
1140          * Make the intersection between
1141          * sensor resolution
1142          * and crop request
1143          */
1144         max_rect.top = 0;
1145         max_rect.left = 0;
1146         max_rect.width = pix.width;
1147         max_rect.height = pix.height;
1148         v4l2_rect_map_inside(&r, &max_rect);
1149         r.top  = clamp_t(s32, r.top, 0, pix.height - r.height);
1150         r.left = clamp_t(s32, r.left, 0, pix.width - r.width);
1151
1152         if (!(r.top == dcmi->sd_bounds.top &&
1153               r.left == dcmi->sd_bounds.left &&
1154               r.width == dcmi->sd_bounds.width &&
1155               r.height == dcmi->sd_bounds.height)) {
1156                 /* Crop if request is different than sensor resolution */
1157                 dcmi->do_crop = true;
1158                 dcmi->crop = r;
1159                 dev_dbg(dcmi->dev, "s_selection: crop %ux%u@(%u,%u) from %ux%u\n",
1160                         r.width, r.height, r.left, r.top,
1161                         pix.width, pix.height);
1162         } else {
1163                 /* Disable crop */
1164                 dcmi->do_crop = false;
1165                 dev_dbg(dcmi->dev, "s_selection: crop is disabled\n");
1166         }
1167
1168         s->r = r;
1169         return 0;
1170 }
1171
1172 static int dcmi_querycap(struct file *file, void *priv,
1173                          struct v4l2_capability *cap)
1174 {
1175         strlcpy(cap->driver, DRV_NAME, sizeof(cap->driver));
1176         strlcpy(cap->card, "STM32 Camera Memory Interface",
1177                 sizeof(cap->card));
1178         strlcpy(cap->bus_info, "platform:dcmi", sizeof(cap->bus_info));
1179         return 0;
1180 }
1181
1182 static int dcmi_enum_input(struct file *file, void *priv,
1183                            struct v4l2_input *i)
1184 {
1185         if (i->index != 0)
1186                 return -EINVAL;
1187
1188         i->type = V4L2_INPUT_TYPE_CAMERA;
1189         strlcpy(i->name, "Camera", sizeof(i->name));
1190         return 0;
1191 }
1192
1193 static int dcmi_g_input(struct file *file, void *priv, unsigned int *i)
1194 {
1195         *i = 0;
1196         return 0;
1197 }
1198
1199 static int dcmi_s_input(struct file *file, void *priv, unsigned int i)
1200 {
1201         if (i > 0)
1202                 return -EINVAL;
1203         return 0;
1204 }
1205
1206 static int dcmi_enum_framesizes(struct file *file, void *fh,
1207                                 struct v4l2_frmsizeenum *fsize)
1208 {
1209         struct stm32_dcmi *dcmi = video_drvdata(file);
1210         const struct dcmi_format *sd_fmt;
1211         struct v4l2_subdev_frame_size_enum fse = {
1212                 .index = fsize->index,
1213                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1214         };
1215         int ret;
1216
1217         sd_fmt = find_format_by_fourcc(dcmi, fsize->pixel_format);
1218         if (!sd_fmt)
1219                 return -EINVAL;
1220
1221         fse.code = sd_fmt->mbus_code;
1222
1223         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, enum_frame_size,
1224                                NULL, &fse);
1225         if (ret)
1226                 return ret;
1227
1228         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1229         fsize->discrete.width = fse.max_width;
1230         fsize->discrete.height = fse.max_height;
1231
1232         return 0;
1233 }
1234
1235 static int dcmi_g_parm(struct file *file, void *priv,
1236                        struct v4l2_streamparm *p)
1237 {
1238         struct stm32_dcmi *dcmi = video_drvdata(file);
1239
1240         return v4l2_g_parm_cap(video_devdata(file), dcmi->entity.subdev, p);
1241 }
1242
1243 static int dcmi_s_parm(struct file *file, void *priv,
1244                        struct v4l2_streamparm *p)
1245 {
1246         struct stm32_dcmi *dcmi = video_drvdata(file);
1247
1248         return v4l2_s_parm_cap(video_devdata(file), dcmi->entity.subdev, p);
1249 }
1250
1251 static int dcmi_enum_frameintervals(struct file *file, void *fh,
1252                                     struct v4l2_frmivalenum *fival)
1253 {
1254         struct stm32_dcmi *dcmi = video_drvdata(file);
1255         const struct dcmi_format *sd_fmt;
1256         struct v4l2_subdev_frame_interval_enum fie = {
1257                 .index = fival->index,
1258                 .width = fival->width,
1259                 .height = fival->height,
1260                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1261         };
1262         int ret;
1263
1264         sd_fmt = find_format_by_fourcc(dcmi, fival->pixel_format);
1265         if (!sd_fmt)
1266                 return -EINVAL;
1267
1268         fie.code = sd_fmt->mbus_code;
1269
1270         ret = v4l2_subdev_call(dcmi->entity.subdev, pad,
1271                                enum_frame_interval, NULL, &fie);
1272         if (ret)
1273                 return ret;
1274
1275         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1276         fival->discrete = fie.interval;
1277
1278         return 0;
1279 }
1280
1281 static const struct of_device_id stm32_dcmi_of_match[] = {
1282         { .compatible = "st,stm32-dcmi"},
1283         { /* end node */ },
1284 };
1285 MODULE_DEVICE_TABLE(of, stm32_dcmi_of_match);
1286
1287 static int dcmi_open(struct file *file)
1288 {
1289         struct stm32_dcmi *dcmi = video_drvdata(file);
1290         struct v4l2_subdev *sd = dcmi->entity.subdev;
1291         int ret;
1292
1293         if (mutex_lock_interruptible(&dcmi->lock))
1294                 return -ERESTARTSYS;
1295
1296         ret = v4l2_fh_open(file);
1297         if (ret < 0)
1298                 goto unlock;
1299
1300         if (!v4l2_fh_is_singular_file(file))
1301                 goto fh_rel;
1302
1303         ret = v4l2_subdev_call(sd, core, s_power, 1);
1304         if (ret < 0 && ret != -ENOIOCTLCMD)
1305                 goto fh_rel;
1306
1307         ret = dcmi_set_fmt(dcmi, &dcmi->fmt);
1308         if (ret)
1309                 v4l2_subdev_call(sd, core, s_power, 0);
1310 fh_rel:
1311         if (ret)
1312                 v4l2_fh_release(file);
1313 unlock:
1314         mutex_unlock(&dcmi->lock);
1315         return ret;
1316 }
1317
1318 static int dcmi_release(struct file *file)
1319 {
1320         struct stm32_dcmi *dcmi = video_drvdata(file);
1321         struct v4l2_subdev *sd = dcmi->entity.subdev;
1322         bool fh_singular;
1323         int ret;
1324
1325         mutex_lock(&dcmi->lock);
1326
1327         fh_singular = v4l2_fh_is_singular_file(file);
1328
1329         ret = _vb2_fop_release(file, NULL);
1330
1331         if (fh_singular)
1332                 v4l2_subdev_call(sd, core, s_power, 0);
1333
1334         mutex_unlock(&dcmi->lock);
1335
1336         return ret;
1337 }
1338
1339 static const struct v4l2_ioctl_ops dcmi_ioctl_ops = {
1340         .vidioc_querycap                = dcmi_querycap,
1341
1342         .vidioc_try_fmt_vid_cap         = dcmi_try_fmt_vid_cap,
1343         .vidioc_g_fmt_vid_cap           = dcmi_g_fmt_vid_cap,
1344         .vidioc_s_fmt_vid_cap           = dcmi_s_fmt_vid_cap,
1345         .vidioc_enum_fmt_vid_cap        = dcmi_enum_fmt_vid_cap,
1346         .vidioc_g_selection             = dcmi_g_selection,
1347         .vidioc_s_selection             = dcmi_s_selection,
1348
1349         .vidioc_enum_input              = dcmi_enum_input,
1350         .vidioc_g_input                 = dcmi_g_input,
1351         .vidioc_s_input                 = dcmi_s_input,
1352
1353         .vidioc_g_parm                  = dcmi_g_parm,
1354         .vidioc_s_parm                  = dcmi_s_parm,
1355
1356         .vidioc_enum_framesizes         = dcmi_enum_framesizes,
1357         .vidioc_enum_frameintervals     = dcmi_enum_frameintervals,
1358
1359         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
1360         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
1361         .vidioc_querybuf                = vb2_ioctl_querybuf,
1362         .vidioc_qbuf                    = vb2_ioctl_qbuf,
1363         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
1364         .vidioc_expbuf                  = vb2_ioctl_expbuf,
1365         .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
1366         .vidioc_streamon                = vb2_ioctl_streamon,
1367         .vidioc_streamoff               = vb2_ioctl_streamoff,
1368
1369         .vidioc_log_status              = v4l2_ctrl_log_status,
1370         .vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
1371         .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
1372 };
1373
1374 static const struct v4l2_file_operations dcmi_fops = {
1375         .owner          = THIS_MODULE,
1376         .unlocked_ioctl = video_ioctl2,
1377         .open           = dcmi_open,
1378         .release        = dcmi_release,
1379         .poll           = vb2_fop_poll,
1380         .mmap           = vb2_fop_mmap,
1381 #ifndef CONFIG_MMU
1382         .get_unmapped_area = vb2_fop_get_unmapped_area,
1383 #endif
1384         .read           = vb2_fop_read,
1385 };
1386
1387 static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi)
1388 {
1389         struct v4l2_format f = {
1390                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1391                 .fmt.pix = {
1392                         .width          = CIF_WIDTH,
1393                         .height         = CIF_HEIGHT,
1394                         .field          = V4L2_FIELD_NONE,
1395                         .pixelformat    = dcmi->sd_formats[0]->fourcc,
1396                 },
1397         };
1398         int ret;
1399
1400         ret = dcmi_try_fmt(dcmi, &f, NULL, NULL);
1401         if (ret)
1402                 return ret;
1403         dcmi->sd_format = dcmi->sd_formats[0];
1404         dcmi->fmt = f;
1405         return 0;
1406 }
1407
1408 static const struct dcmi_format dcmi_formats[] = {
1409         {
1410                 .fourcc = V4L2_PIX_FMT_RGB565,
1411                 .mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
1412                 .bpp = 2,
1413         }, {
1414                 .fourcc = V4L2_PIX_FMT_YUYV,
1415                 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
1416                 .bpp = 2,
1417         }, {
1418                 .fourcc = V4L2_PIX_FMT_UYVY,
1419                 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1420                 .bpp = 2,
1421         }, {
1422                 .fourcc = V4L2_PIX_FMT_JPEG,
1423                 .mbus_code = MEDIA_BUS_FMT_JPEG_1X8,
1424                 .bpp = 1,
1425         },
1426 };
1427
1428 static int dcmi_formats_init(struct stm32_dcmi *dcmi)
1429 {
1430         const struct dcmi_format *sd_fmts[ARRAY_SIZE(dcmi_formats)];
1431         unsigned int num_fmts = 0, i, j;
1432         struct v4l2_subdev *subdev = dcmi->entity.subdev;
1433         struct v4l2_subdev_mbus_code_enum mbus_code = {
1434                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1435         };
1436
1437         while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
1438                                  NULL, &mbus_code)) {
1439                 for (i = 0; i < ARRAY_SIZE(dcmi_formats); i++) {
1440                         if (dcmi_formats[i].mbus_code != mbus_code.code)
1441                                 continue;
1442
1443                         /* Code supported, have we got this fourcc yet? */
1444                         for (j = 0; j < num_fmts; j++)
1445                                 if (sd_fmts[j]->fourcc ==
1446                                                 dcmi_formats[i].fourcc)
1447                                         /* Already available */
1448                                         break;
1449                         if (j == num_fmts)
1450                                 /* New */
1451                                 sd_fmts[num_fmts++] = dcmi_formats + i;
1452                 }
1453                 mbus_code.index++;
1454         }
1455
1456         if (!num_fmts)
1457                 return -ENXIO;
1458
1459         dcmi->num_of_sd_formats = num_fmts;
1460         dcmi->sd_formats = devm_kcalloc(dcmi->dev,
1461                                         num_fmts, sizeof(struct dcmi_format *),
1462                                         GFP_KERNEL);
1463         if (!dcmi->sd_formats) {
1464                 dev_err(dcmi->dev, "Could not allocate memory\n");
1465                 return -ENOMEM;
1466         }
1467
1468         memcpy(dcmi->sd_formats, sd_fmts,
1469                num_fmts * sizeof(struct dcmi_format *));
1470         dcmi->sd_format = dcmi->sd_formats[0];
1471
1472         return 0;
1473 }
1474
1475 static int dcmi_framesizes_init(struct stm32_dcmi *dcmi)
1476 {
1477         unsigned int num_fsize = 0;
1478         struct v4l2_subdev *subdev = dcmi->entity.subdev;
1479         struct v4l2_subdev_frame_size_enum fse = {
1480                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1481                 .code = dcmi->sd_format->mbus_code,
1482         };
1483         unsigned int ret;
1484         unsigned int i;
1485
1486         /* Allocate discrete framesizes array */
1487         while (!v4l2_subdev_call(subdev, pad, enum_frame_size,
1488                                  NULL, &fse))
1489                 fse.index++;
1490
1491         num_fsize = fse.index;
1492         if (!num_fsize)
1493                 return 0;
1494
1495         dcmi->num_of_sd_framesizes = num_fsize;
1496         dcmi->sd_framesizes = devm_kcalloc(dcmi->dev, num_fsize,
1497                                            sizeof(struct dcmi_framesize),
1498                                            GFP_KERNEL);
1499         if (!dcmi->sd_framesizes) {
1500                 dev_err(dcmi->dev, "Could not allocate memory\n");
1501                 return -ENOMEM;
1502         }
1503
1504         /* Fill array with sensor supported framesizes */
1505         dev_dbg(dcmi->dev, "Sensor supports %u frame sizes:\n", num_fsize);
1506         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
1507                 fse.index = i;
1508                 ret = v4l2_subdev_call(subdev, pad, enum_frame_size,
1509                                        NULL, &fse);
1510                 if (ret)
1511                         return ret;
1512                 dcmi->sd_framesizes[fse.index].width = fse.max_width;
1513                 dcmi->sd_framesizes[fse.index].height = fse.max_height;
1514                 dev_dbg(dcmi->dev, "%ux%u\n", fse.max_width, fse.max_height);
1515         }
1516
1517         return 0;
1518 }
1519
1520 static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier)
1521 {
1522         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1523         int ret;
1524
1525         dcmi->vdev->ctrl_handler = dcmi->entity.subdev->ctrl_handler;
1526         ret = dcmi_formats_init(dcmi);
1527         if (ret) {
1528                 dev_err(dcmi->dev, "No supported mediabus format found\n");
1529                 return ret;
1530         }
1531
1532         ret = dcmi_framesizes_init(dcmi);
1533         if (ret) {
1534                 dev_err(dcmi->dev, "Could not initialize framesizes\n");
1535                 return ret;
1536         }
1537
1538         ret = dcmi_get_sensor_bounds(dcmi, &dcmi->sd_bounds);
1539         if (ret) {
1540                 dev_err(dcmi->dev, "Could not get sensor bounds\n");
1541                 return ret;
1542         }
1543
1544         ret = dcmi_set_default_fmt(dcmi);
1545         if (ret) {
1546                 dev_err(dcmi->dev, "Could not set default format\n");
1547                 return ret;
1548         }
1549
1550         ret = video_register_device(dcmi->vdev, VFL_TYPE_GRABBER, -1);
1551         if (ret) {
1552                 dev_err(dcmi->dev, "Failed to register video device\n");
1553                 return ret;
1554         }
1555
1556         dev_dbg(dcmi->dev, "Device registered as %s\n",
1557                 video_device_node_name(dcmi->vdev));
1558         return 0;
1559 }
1560
1561 static void dcmi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
1562                                      struct v4l2_subdev *sd,
1563                                      struct v4l2_async_subdev *asd)
1564 {
1565         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1566
1567         dev_dbg(dcmi->dev, "Removing %s\n", video_device_node_name(dcmi->vdev));
1568
1569         /* Checks internaly if vdev has been init or not */
1570         video_unregister_device(dcmi->vdev);
1571 }
1572
1573 static int dcmi_graph_notify_bound(struct v4l2_async_notifier *notifier,
1574                                    struct v4l2_subdev *subdev,
1575                                    struct v4l2_async_subdev *asd)
1576 {
1577         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1578
1579         dev_dbg(dcmi->dev, "Subdev %s bound\n", subdev->name);
1580
1581         dcmi->entity.subdev = subdev;
1582
1583         return 0;
1584 }
1585
1586 static const struct v4l2_async_notifier_operations dcmi_graph_notify_ops = {
1587         .bound = dcmi_graph_notify_bound,
1588         .unbind = dcmi_graph_notify_unbind,
1589         .complete = dcmi_graph_notify_complete,
1590 };
1591
1592 static int dcmi_graph_parse(struct stm32_dcmi *dcmi, struct device_node *node)
1593 {
1594         struct device_node *ep = NULL;
1595         struct device_node *remote;
1596
1597         while (1) {
1598                 ep = of_graph_get_next_endpoint(node, ep);
1599                 if (!ep)
1600                         return -EINVAL;
1601
1602                 remote = of_graph_get_remote_port_parent(ep);
1603                 if (!remote) {
1604                         of_node_put(ep);
1605                         return -EINVAL;
1606                 }
1607
1608                 /* Remote node to connect */
1609                 dcmi->entity.node = remote;
1610                 dcmi->entity.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
1611                 dcmi->entity.asd.match.fwnode = of_fwnode_handle(remote);
1612                 return 0;
1613         }
1614 }
1615
1616 static int dcmi_graph_init(struct stm32_dcmi *dcmi)
1617 {
1618         struct v4l2_async_subdev **subdevs = NULL;
1619         int ret;
1620
1621         /* Parse the graph to extract a list of subdevice DT nodes. */
1622         ret = dcmi_graph_parse(dcmi, dcmi->dev->of_node);
1623         if (ret < 0) {
1624                 dev_err(dcmi->dev, "Graph parsing failed\n");
1625                 return ret;
1626         }
1627
1628         /* Register the subdevices notifier. */
1629         subdevs = devm_kzalloc(dcmi->dev, sizeof(*subdevs), GFP_KERNEL);
1630         if (!subdevs) {
1631                 of_node_put(dcmi->entity.node);
1632                 return -ENOMEM;
1633         }
1634
1635         subdevs[0] = &dcmi->entity.asd;
1636
1637         dcmi->notifier.subdevs = subdevs;
1638         dcmi->notifier.num_subdevs = 1;
1639         dcmi->notifier.ops = &dcmi_graph_notify_ops;
1640
1641         ret = v4l2_async_notifier_register(&dcmi->v4l2_dev, &dcmi->notifier);
1642         if (ret < 0) {
1643                 dev_err(dcmi->dev, "Notifier registration failed\n");
1644                 of_node_put(dcmi->entity.node);
1645                 return ret;
1646         }
1647
1648         return 0;
1649 }
1650
1651 static int dcmi_probe(struct platform_device *pdev)
1652 {
1653         struct device_node *np = pdev->dev.of_node;
1654         const struct of_device_id *match = NULL;
1655         struct v4l2_fwnode_endpoint ep;
1656         struct stm32_dcmi *dcmi;
1657         struct vb2_queue *q;
1658         struct dma_chan *chan;
1659         struct clk *mclk;
1660         int irq;
1661         int ret = 0;
1662
1663         match = of_match_device(of_match_ptr(stm32_dcmi_of_match), &pdev->dev);
1664         if (!match) {
1665                 dev_err(&pdev->dev, "Could not find a match in devicetree\n");
1666                 return -ENODEV;
1667         }
1668
1669         dcmi = devm_kzalloc(&pdev->dev, sizeof(struct stm32_dcmi), GFP_KERNEL);
1670         if (!dcmi)
1671                 return -ENOMEM;
1672
1673         dcmi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
1674         if (IS_ERR(dcmi->rstc)) {
1675                 dev_err(&pdev->dev, "Could not get reset control\n");
1676                 return -ENODEV;
1677         }
1678
1679         /* Get bus characteristics from devicetree */
1680         np = of_graph_get_next_endpoint(np, NULL);
1681         if (!np) {
1682                 dev_err(&pdev->dev, "Could not find the endpoint\n");
1683                 of_node_put(np);
1684                 return -ENODEV;
1685         }
1686
1687         ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
1688         if (ret) {
1689                 dev_err(&pdev->dev, "Could not parse the endpoint\n");
1690                 of_node_put(np);
1691                 return -ENODEV;
1692         }
1693
1694         if (ep.bus_type == V4L2_MBUS_CSI2) {
1695                 dev_err(&pdev->dev, "CSI bus not supported\n");
1696                 of_node_put(np);
1697                 return -ENODEV;
1698         }
1699         dcmi->bus.flags = ep.bus.parallel.flags;
1700         dcmi->bus.bus_width = ep.bus.parallel.bus_width;
1701         dcmi->bus.data_shift = ep.bus.parallel.data_shift;
1702
1703         of_node_put(np);
1704
1705         irq = platform_get_irq(pdev, 0);
1706         if (irq <= 0) {
1707                 dev_err(&pdev->dev, "Could not get irq\n");
1708                 return -ENODEV;
1709         }
1710
1711         dcmi->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1712         if (!dcmi->res) {
1713                 dev_err(&pdev->dev, "Could not get resource\n");
1714                 return -ENODEV;
1715         }
1716
1717         dcmi->regs = devm_ioremap_resource(&pdev->dev, dcmi->res);
1718         if (IS_ERR(dcmi->regs)) {
1719                 dev_err(&pdev->dev, "Could not map registers\n");
1720                 return PTR_ERR(dcmi->regs);
1721         }
1722
1723         ret = devm_request_threaded_irq(&pdev->dev, irq, dcmi_irq_callback,
1724                                         dcmi_irq_thread, IRQF_ONESHOT,
1725                                         dev_name(&pdev->dev), dcmi);
1726         if (ret) {
1727                 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1728                 return -ENODEV;
1729         }
1730
1731         mclk = devm_clk_get(&pdev->dev, "mclk");
1732         if (IS_ERR(mclk)) {
1733                 dev_err(&pdev->dev, "Unable to get mclk\n");
1734                 return PTR_ERR(mclk);
1735         }
1736
1737         chan = dma_request_slave_channel(&pdev->dev, "tx");
1738         if (!chan) {
1739                 dev_info(&pdev->dev, "Unable to request DMA channel, defer probing\n");
1740                 return -EPROBE_DEFER;
1741         }
1742
1743         ret = clk_prepare(mclk);
1744         if (ret) {
1745                 dev_err(&pdev->dev, "Unable to prepare mclk %p\n", mclk);
1746                 goto err_dma_release;
1747         }
1748
1749         spin_lock_init(&dcmi->irqlock);
1750         mutex_init(&dcmi->lock);
1751         init_completion(&dcmi->complete);
1752         INIT_LIST_HEAD(&dcmi->buffers);
1753
1754         dcmi->dev = &pdev->dev;
1755         dcmi->mclk = mclk;
1756         dcmi->state = STOPPED;
1757         dcmi->dma_chan = chan;
1758
1759         q = &dcmi->queue;
1760
1761         /* Initialize the top-level structure */
1762         ret = v4l2_device_register(&pdev->dev, &dcmi->v4l2_dev);
1763         if (ret)
1764                 goto err_clk_unprepare;
1765
1766         dcmi->vdev = video_device_alloc();
1767         if (!dcmi->vdev) {
1768                 ret = -ENOMEM;
1769                 goto err_device_unregister;
1770         }
1771
1772         /* Video node */
1773         dcmi->vdev->fops = &dcmi_fops;
1774         dcmi->vdev->v4l2_dev = &dcmi->v4l2_dev;
1775         dcmi->vdev->queue = &dcmi->queue;
1776         strlcpy(dcmi->vdev->name, KBUILD_MODNAME, sizeof(dcmi->vdev->name));
1777         dcmi->vdev->release = video_device_release;
1778         dcmi->vdev->ioctl_ops = &dcmi_ioctl_ops;
1779         dcmi->vdev->lock = &dcmi->lock;
1780         dcmi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
1781                                   V4L2_CAP_READWRITE;
1782         video_set_drvdata(dcmi->vdev, dcmi);
1783
1784         /* Buffer queue */
1785         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1786         q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
1787         q->lock = &dcmi->lock;
1788         q->drv_priv = dcmi;
1789         q->buf_struct_size = sizeof(struct dcmi_buf);
1790         q->ops = &dcmi_video_qops;
1791         q->mem_ops = &vb2_dma_contig_memops;
1792         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1793         q->min_buffers_needed = 2;
1794         q->dev = &pdev->dev;
1795
1796         ret = vb2_queue_init(q);
1797         if (ret < 0) {
1798                 dev_err(&pdev->dev, "Failed to initialize vb2 queue\n");
1799                 goto err_device_release;
1800         }
1801
1802         ret = dcmi_graph_init(dcmi);
1803         if (ret < 0)
1804                 goto err_device_release;
1805
1806         /* Reset device */
1807         ret = reset_control_assert(dcmi->rstc);
1808         if (ret) {
1809                 dev_err(&pdev->dev, "Failed to assert the reset line\n");
1810                 goto err_device_release;
1811         }
1812
1813         usleep_range(3000, 5000);
1814
1815         ret = reset_control_deassert(dcmi->rstc);
1816         if (ret) {
1817                 dev_err(&pdev->dev, "Failed to deassert the reset line\n");
1818                 goto err_device_release;
1819         }
1820
1821         dev_info(&pdev->dev, "Probe done\n");
1822
1823         platform_set_drvdata(pdev, dcmi);
1824         return 0;
1825
1826 err_device_release:
1827         video_device_release(dcmi->vdev);
1828 err_device_unregister:
1829         v4l2_device_unregister(&dcmi->v4l2_dev);
1830 err_clk_unprepare:
1831         clk_unprepare(dcmi->mclk);
1832 err_dma_release:
1833         dma_release_channel(dcmi->dma_chan);
1834
1835         return ret;
1836 }
1837
1838 static int dcmi_remove(struct platform_device *pdev)
1839 {
1840         struct stm32_dcmi *dcmi = platform_get_drvdata(pdev);
1841
1842         v4l2_async_notifier_unregister(&dcmi->notifier);
1843         v4l2_device_unregister(&dcmi->v4l2_dev);
1844         clk_unprepare(dcmi->mclk);
1845         dma_release_channel(dcmi->dma_chan);
1846
1847         return 0;
1848 }
1849
1850 static struct platform_driver stm32_dcmi_driver = {
1851         .probe          = dcmi_probe,
1852         .remove         = dcmi_remove,
1853         .driver         = {
1854                 .name = DRV_NAME,
1855                 .of_match_table = of_match_ptr(stm32_dcmi_of_match),
1856         },
1857 };
1858
1859 module_platform_driver(stm32_dcmi_driver);
1860
1861 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
1862 MODULE_AUTHOR("Hugues Fruchet <hugues.fruchet@st.com>");
1863 MODULE_DESCRIPTION("STMicroelectronics STM32 Digital Camera Memory Interface driver");
1864 MODULE_LICENSE("GPL");
1865 MODULE_SUPPORTED_DEVICE("video");