// SPDX-License-Identifier: GPL-2.0-only
/*
 * BCM283x / BCM271x Unicam Capture Driver
 *
 * Copyright (C) 2017-2020 - Raspberry Pi (Trading) Ltd.
 * Copyright (C) 2024 - Ideas on Board
 *
 * Dave Stevenson <dave.stevenson@raspberrypi.com>
 *
 * Based on TI am437x driver by
 *   Benoit Parrot <bparrot@ti.com>
 *   Lad, Prabhakar <prabhakar.csengg@gmail.com>
 *
 * and TI CAL camera interface driver by
 *    Benoit Parrot <bparrot@ti.com>
 *
 *
 * There are two camera drivers in the kernel for BCM283x - this one and
 * bcm2835-camera (currently in staging).
 *
 * This driver directly controls the Unicam peripheral - there is no
 * involvement with the VideoCore firmware. Unicam receives CSI-2 or CCP2 data
 * and writes it into SDRAM. The only potential processing options are to
 * repack Bayer data into an alternate format, and applying windowing. The
 * repacking does not shift the data, so can repack V4L2_PIX_FMT_Sxxxx10P to
 * V4L2_PIX_FMT_Sxxxx10, or V4L2_PIX_FMT_Sxxxx12P to V4L2_PIX_FMT_Sxxxx12, but
 * not generically up to V4L2_PIX_FMT_Sxxxx16. Support for windowing may be
 * added later.
 *
 * It should be possible to connect this driver to any sensor with a suitable
 * output interface and V4L2 subdevice driver.
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/videodev2.h>

#include <media/mipi-csi2.h>
#include <media/v4l2-async.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-mc.h>
#include <media/v4l2-subdev.h>
#include <media/videobuf2-dma-contig.h>

#include "bcm2835-unicam-regs.h"

#define UNICAM_MODULE_NAME              "unicam"

/*
 * Unicam must request a minimum of 250Mhz from the VPU clock.
 * Otherwise the input FIFOs overrun and cause image corruption.
 */
#define UNICAM_MIN_VPU_CLOCK_RATE       (250 * 1000 * 1000)

/* Unicam has an internal DMA alignment constraint of 16 bytes for each line. */
#define UNICAM_DMA_BPL_ALIGNMENT        16

/*
 * The image stride is stored in a 16 bit register, and needs to be aligned to
 * the DMA constraint. As the ISP in the same SoC has a 32 bytes alignment
 * constraint on its input, set the image stride alignment to 32 bytes here as
 * well to avoid incompatible configurations.
 */
#define UNICAM_IMAGE_BPL_ALIGNMENT      32
#define UNICAM_IMAGE_MAX_BPL            ((1U << 16) - UNICAM_IMAGE_BPL_ALIGNMENT)

/*
 * Max width is therefore determined by the max stride divided by the number of
 * bits per pixel. Take 32bpp as a worst case. No imposed limit on the height,
 * so adopt a square image for want of anything better.
 */
#define UNICAM_IMAGE_MIN_WIDTH          16
#define UNICAM_IMAGE_MIN_HEIGHT         16
#define UNICAM_IMAGE_MAX_WIDTH          (UNICAM_IMAGE_MAX_BPL / 4)
#define UNICAM_IMAGE_MAX_HEIGHT         UNICAM_IMAGE_MAX_WIDTH

/*
 * There's no intrinsic limits on the width and height for embedded data. Use
 * the same maximum values as for the image, to avoid overflows in the image
 * size computation.
 */
#define UNICAM_META_MIN_WIDTH           1
#define UNICAM_META_MIN_HEIGHT          1
#define UNICAM_META_MAX_WIDTH           UNICAM_IMAGE_MAX_WIDTH
#define UNICAM_META_MAX_HEIGHT          UNICAM_IMAGE_MAX_HEIGHT

/*
 * Size of the dummy buffer. Can be any size really, but the DMA
 * allocation works in units of page sizes.
 */
#define UNICAM_DUMMY_BUF_SIZE           PAGE_SIZE

enum unicam_pad {
        UNICAM_SD_PAD_SINK,
        UNICAM_SD_PAD_SOURCE_IMAGE,
        UNICAM_SD_PAD_SOURCE_METADATA,
        UNICAM_SD_NUM_PADS
};

enum unicam_node_type {
        UNICAM_IMAGE_NODE,
        UNICAM_METADATA_NODE,
        UNICAM_MAX_NODES
};

/*
 * struct unicam_format_info - Unicam media bus format information
 * @fourcc: V4L2 pixel format FCC identifier. 0 if n/a.
 * @unpacked_fourcc: V4L2 pixel format FCC identifier if the data is expanded
 * out to 16bpp. 0 if n/a.
 * @code: V4L2 media bus format code.
 * @depth: Bits per pixel as delivered from the source.
 * @csi_dt: CSI data type.
 * @unpack: PUM value when unpacking to @unpacked_fourcc
 */
struct unicam_format_info {
        u32     fourcc;
        u32     unpacked_fourcc;
        u32     code;
        u8      depth;
        u8      csi_dt;
        u8      unpack;
};

struct unicam_buffer {
        struct vb2_v4l2_buffer vb;
        struct list_head list;
        dma_addr_t dma_addr;
        unsigned int size;
};

static inline struct unicam_buffer *to_unicam_buffer(struct vb2_buffer *vb)
{
        return container_of(vb, struct unicam_buffer, vb.vb2_buf);
}

struct unicam_node {
        bool registered;
        unsigned int id;

        /* Pointer to the current v4l2_buffer */
        struct unicam_buffer *cur_frm;
        /* Pointer to the next v4l2_buffer */
        struct unicam_buffer *next_frm;
        /* Used to store current pixel format */
        struct v4l2_format fmt;
        /* Buffer queue used in video-buf */
        struct vb2_queue buffer_queue;
        /* Queue of filled frames */
        struct list_head dma_queue;
        /* IRQ lock for DMA queue */
        spinlock_t dma_queue_lock;
        /* Identifies video device for this channel */
        struct video_device video_dev;
        /* Pointer to the parent handle */
        struct unicam_device *dev;
        struct media_pad pad;
        /*
         * Dummy buffer intended to be used by unicam
         * if we have no other queued buffers to swap to.
         */
        struct unicam_buffer dummy_buf;
        void *dummy_buf_cpu_addr;
};

struct unicam_device {
        struct kref kref;

        /* peripheral base address */
        void __iomem *base;
        /* clock gating base address */
        void __iomem *clk_gate_base;
        /* lp clock handle */
        struct clk *clock;
        /* vpu clock handle */
        struct clk *vpu_clock;
        /* V4l2 device */
        struct v4l2_device v4l2_dev;
        struct media_device mdev;

        /* parent device */
        struct device *dev;
        /* subdevice async notifier */
        struct v4l2_async_notifier notifier;
        unsigned int sequence;
        bool frame_started;

        /* Sensor node */
        struct {
                struct v4l2_subdev *subdev;
                struct media_pad *pad;
        } sensor;

        /* Internal subdev */
        struct {
                struct v4l2_subdev sd;
                struct media_pad pads[UNICAM_SD_NUM_PADS];
                unsigned int enabled_streams;
        } subdev;

        enum v4l2_mbus_type bus_type;
        /*
         * Stores bus.mipi_csi2.flags for CSI2 sensors, or
         * bus.mipi_csi1.strobe for CCP2.
         */
        unsigned int bus_flags;
        unsigned int max_data_lanes;

        struct {
                struct media_pipeline pipe;
                unsigned int num_data_lanes;
                unsigned int nodes;
        } pipe;

        /* Lock used for the video devices of both nodes */
        struct mutex lock;
        struct unicam_node node[UNICAM_MAX_NODES];
};

static inline struct unicam_device *
notifier_to_unicam_device(struct v4l2_async_notifier *notifier)
{
        return container_of(notifier, struct unicam_device, notifier);
}

static inline struct unicam_device *
sd_to_unicam_device(struct v4l2_subdev *sd)
{
        return container_of(sd, struct unicam_device, subdev.sd);
}

static void unicam_release(struct kref *kref)
{
        struct unicam_device *unicam =
                container_of(kref, struct unicam_device, kref);

        if (unicam->mdev.dev)
                media_device_cleanup(&unicam->mdev);

        mutex_destroy(&unicam->lock);
        kfree(unicam);
}

static struct unicam_device *unicam_get(struct unicam_device *unicam)
{
        kref_get(&unicam->kref);

        return unicam;
}

static void unicam_put(struct unicam_device *unicam)
{
        kref_put(&unicam->kref, unicam_release);
}

/* -----------------------------------------------------------------------------
 * Misc helper functions
 */

static inline bool unicam_sd_pad_is_source(u32 pad)
{
        /* Camera RX has 1 sink pad, and N source pads */
        return pad != UNICAM_SD_PAD_SINK;
}

static inline bool is_metadata_node(struct unicam_node *node)
{
        return node->video_dev.device_caps & V4L2_CAP_META_CAPTURE;
}

static inline bool is_image_node(struct unicam_node *node)
{
        return node->video_dev.device_caps & V4L2_CAP_VIDEO_CAPTURE;
}

/* -----------------------------------------------------------------------------
 * Format data table and helper functions
 */

static const struct v4l2_mbus_framefmt unicam_default_image_format = {
        .width = 640,
        .height = 480,
        .code = MEDIA_BUS_FMT_UYVY8_1X16,
        .field = V4L2_FIELD_NONE,
        .colorspace = V4L2_COLORSPACE_SRGB,
        .ycbcr_enc = V4L2_YCBCR_ENC_601,
        .quantization = V4L2_QUANTIZATION_LIM_RANGE,
        .xfer_func = V4L2_XFER_FUNC_SRGB,
        .flags = 0,
};

static const struct v4l2_mbus_framefmt unicam_default_meta_format = {
        .width = 640,
        .height = 2,
        .code = MEDIA_BUS_FMT_META_8,
        .field = V4L2_FIELD_NONE,
};

static const struct unicam_format_info unicam_image_formats[] = {
        /* YUV Formats */
        {
                .fourcc         = V4L2_PIX_FMT_YUYV,
                .code           = MEDIA_BUS_FMT_YUYV8_1X16,
                .depth          = 16,
                .csi_dt         = MIPI_CSI2_DT_YUV422_8B,
        }, {
                .fourcc         = V4L2_PIX_FMT_UYVY,
                .code           = MEDIA_BUS_FMT_UYVY8_1X16,
                .depth          = 16,
                .csi_dt         = MIPI_CSI2_DT_YUV422_8B,
        }, {
                .fourcc         = V4L2_PIX_FMT_YVYU,
                .code           = MEDIA_BUS_FMT_YVYU8_1X16,
                .depth          = 16,
                .csi_dt         = MIPI_CSI2_DT_YUV422_8B,
        }, {
                .fourcc         = V4L2_PIX_FMT_VYUY,
                .code           = MEDIA_BUS_FMT_VYUY8_1X16,
                .depth          = 16,
                .csi_dt         = MIPI_CSI2_DT_YUV422_8B,
        }, {
        /* RGB Formats */
                .fourcc         = V4L2_PIX_FMT_RGB565, /* gggbbbbb rrrrrggg */
                .code           = MEDIA_BUS_FMT_RGB565_1X16,
                .depth          = 16,
                .csi_dt         = MIPI_CSI2_DT_RGB565,
        }, {
                .fourcc         = V4L2_PIX_FMT_RGB24, /* rgb */
                .code           = MEDIA_BUS_FMT_RGB888_1X24,
                .depth          = 24,
                .csi_dt         = MIPI_CSI2_DT_RGB888,
        }, {
                .fourcc         = V4L2_PIX_FMT_BGR24, /* bgr */
                .code           = MEDIA_BUS_FMT_BGR888_1X24,
                .depth          = 24,
                .csi_dt         = MIPI_CSI2_DT_RGB888,
        }, {
        /* Bayer Formats */
                .fourcc         = V4L2_PIX_FMT_SBGGR8,
                .code           = MEDIA_BUS_FMT_SBGGR8_1X8,
                .depth          = 8,
                .csi_dt         = MIPI_CSI2_DT_RAW8,
        }, {
                .fourcc         = V4L2_PIX_FMT_SGBRG8,
                .code           = MEDIA_BUS_FMT_SGBRG8_1X8,
                .depth          = 8,
                .csi_dt         = MIPI_CSI2_DT_RAW8,
        }, {
                .fourcc         = V4L2_PIX_FMT_SGRBG8,
                .code           = MEDIA_BUS_FMT_SGRBG8_1X8,
                .depth          = 8,
                .csi_dt         = MIPI_CSI2_DT_RAW8,
        }, {
                .fourcc         = V4L2_PIX_FMT_SRGGB8,
                .code           = MEDIA_BUS_FMT_SRGGB8_1X8,
                .depth          = 8,
                .csi_dt         = MIPI_CSI2_DT_RAW8,
        }, {
                .fourcc         = V4L2_PIX_FMT_SBGGR10P,
                .unpacked_fourcc = V4L2_PIX_FMT_SBGGR10,
                .code           = MEDIA_BUS_FMT_SBGGR10_1X10,
                .depth          = 10,
                .csi_dt         = MIPI_CSI2_DT_RAW10,
                .unpack         = UNICAM_PUM_UNPACK10,
        }, {
                .fourcc         = V4L2_PIX_FMT_SGBRG10P,
                .unpacked_fourcc = V4L2_PIX_FMT_SGBRG10,
                .code           = MEDIA_BUS_FMT_SGBRG10_1X10,
                .depth          = 10,
                .csi_dt         = MIPI_CSI2_DT_RAW10,
                .unpack         = UNICAM_PUM_UNPACK10,
        }, {
                .fourcc         = V4L2_PIX_FMT_SGRBG10P,
                .unpacked_fourcc = V4L2_PIX_FMT_SGRBG10,
                .code           = MEDIA_BUS_FMT_SGRBG10_1X10,
                .depth          = 10,
                .csi_dt         = MIPI_CSI2_DT_RAW10,
                .unpack         = UNICAM_PUM_UNPACK10,
        }, {
                .fourcc         = V4L2_PIX_FMT_SRGGB10P,
                .unpacked_fourcc = V4L2_PIX_FMT_SRGGB10,
                .code           = MEDIA_BUS_FMT_SRGGB10_1X10,
                .depth          = 10,
                .csi_dt         = MIPI_CSI2_DT_RAW10,
                .unpack         = UNICAM_PUM_UNPACK10,
        }, {
                .fourcc         = V4L2_PIX_FMT_SBGGR12P,
                .unpacked_fourcc = V4L2_PIX_FMT_SBGGR12,
                .code           = MEDIA_BUS_FMT_SBGGR12_1X12,
                .depth          = 12,
                .csi_dt         = MIPI_CSI2_DT_RAW12,
                .unpack         = UNICAM_PUM_UNPACK12,
        }, {
                .fourcc         = V4L2_PIX_FMT_SGBRG12P,
                .unpacked_fourcc = V4L2_PIX_FMT_SGBRG12,
                .code           = MEDIA_BUS_FMT_SGBRG12_1X12,
                .depth          = 12,
                .csi_dt         = MIPI_CSI2_DT_RAW12,
                .unpack         = UNICAM_PUM_UNPACK12,
        }, {
                .fourcc         = V4L2_PIX_FMT_SGRBG12P,
                .unpacked_fourcc = V4L2_PIX_FMT_SGRBG12,
                .code           = MEDIA_BUS_FMT_SGRBG12_1X12,
                .depth          = 12,
                .csi_dt         = MIPI_CSI2_DT_RAW12,
                .unpack         = UNICAM_PUM_UNPACK12,
        }, {
                .fourcc         = V4L2_PIX_FMT_SRGGB12P,
                .unpacked_fourcc = V4L2_PIX_FMT_SRGGB12,
                .code           = MEDIA_BUS_FMT_SRGGB12_1X12,
                .depth          = 12,
                .csi_dt         = MIPI_CSI2_DT_RAW12,
                .unpack         = UNICAM_PUM_UNPACK12,
        }, {
                .fourcc         = V4L2_PIX_FMT_SBGGR14P,
                .unpacked_fourcc = V4L2_PIX_FMT_SBGGR14,
                .code           = MEDIA_BUS_FMT_SBGGR14_1X14,
                .depth          = 14,
                .csi_dt         = MIPI_CSI2_DT_RAW14,
                .unpack         = UNICAM_PUM_UNPACK14,
        }, {
                .fourcc         = V4L2_PIX_FMT_SGBRG14P,
                .unpacked_fourcc = V4L2_PIX_FMT_SGBRG14,
                .code           = MEDIA_BUS_FMT_SGBRG14_1X14,
                .depth          = 14,
                .csi_dt         = MIPI_CSI2_DT_RAW14,
                .unpack         = UNICAM_PUM_UNPACK14,
        }, {
                .fourcc         = V4L2_PIX_FMT_SGRBG14P,
                .unpacked_fourcc = V4L2_PIX_FMT_SGRBG14,
                .code           = MEDIA_BUS_FMT_SGRBG14_1X14,
                .depth          = 14,
                .csi_dt         = MIPI_CSI2_DT_RAW14,
                .unpack         = UNICAM_PUM_UNPACK14,
        }, {
                .fourcc         = V4L2_PIX_FMT_SRGGB14P,
                .unpacked_fourcc = V4L2_PIX_FMT_SRGGB14,
                .code           = MEDIA_BUS_FMT_SRGGB14_1X14,
                .depth          = 14,
                .csi_dt         = MIPI_CSI2_DT_RAW14,
                .unpack         = UNICAM_PUM_UNPACK14,
        }, {
        /* 16 bit Bayer formats could be supported. */

        /* Greyscale formats */
                .fourcc         = V4L2_PIX_FMT_GREY,
                .code           = MEDIA_BUS_FMT_Y8_1X8,
                .depth          = 8,
                .csi_dt         = MIPI_CSI2_DT_RAW8,
        }, {
                .fourcc         = V4L2_PIX_FMT_Y10P,
                .unpacked_fourcc = V4L2_PIX_FMT_Y10,
                .code           = MEDIA_BUS_FMT_Y10_1X10,
                .depth          = 10,
                .csi_dt         = MIPI_CSI2_DT_RAW10,
                .unpack         = UNICAM_PUM_UNPACK10,
        }, {
                .fourcc         = V4L2_PIX_FMT_Y12P,
                .unpacked_fourcc = V4L2_PIX_FMT_Y12,
                .code           = MEDIA_BUS_FMT_Y12_1X12,
                .depth          = 12,
                .csi_dt         = MIPI_CSI2_DT_RAW12,
                .unpack         = UNICAM_PUM_UNPACK12,
        }, {
                .fourcc         = V4L2_PIX_FMT_Y14P,
                .unpacked_fourcc = V4L2_PIX_FMT_Y14,
                .code           = MEDIA_BUS_FMT_Y14_1X14,
                .depth          = 14,
                .csi_dt         = MIPI_CSI2_DT_RAW14,
                .unpack         = UNICAM_PUM_UNPACK14,
        },
};

static const struct unicam_format_info unicam_meta_formats[] = {
        {
                .fourcc         = V4L2_META_FMT_GENERIC_8,
                .code           = MEDIA_BUS_FMT_META_8,
                .depth          = 8,
        }, {
                .fourcc         = V4L2_META_FMT_GENERIC_CSI2_10,
                .code           = MEDIA_BUS_FMT_META_10,
                .depth          = 10,
        }, {
                .fourcc         = V4L2_META_FMT_GENERIC_CSI2_12,
                .code           = MEDIA_BUS_FMT_META_12,
                .depth          = 12,
        }, {
                .fourcc         = V4L2_META_FMT_GENERIC_CSI2_14,
                .code           = MEDIA_BUS_FMT_META_14,
                .depth          = 14,
        },
};

/* Format setup functions */
static const struct unicam_format_info *
unicam_find_format_by_code(u32 code, u32 pad)
{
        const struct unicam_format_info *formats;
        unsigned int num_formats;
        unsigned int i;

        if (pad == UNICAM_SD_PAD_SOURCE_IMAGE) {
                formats = unicam_image_formats;
                num_formats = ARRAY_SIZE(unicam_image_formats);
        } else {
                formats = unicam_meta_formats;
                num_formats = ARRAY_SIZE(unicam_meta_formats);
        }

        for (i = 0; i < num_formats; i++) {
                if (formats[i].code == code)
                        return &formats[i];
        }

        return NULL;
}

static const struct unicam_format_info *
unicam_find_format_by_fourcc(u32 fourcc, u32 pad)
{
        const struct unicam_format_info *formats;
        unsigned int num_formats;
        unsigned int i;

        if (pad == UNICAM_SD_PAD_SOURCE_IMAGE) {
                formats = unicam_image_formats;
                num_formats = ARRAY_SIZE(unicam_image_formats);
        } else {
                formats = unicam_meta_formats;
                num_formats = ARRAY_SIZE(unicam_meta_formats);
        }

        for (i = 0; i < num_formats; ++i) {
                if (formats[i].fourcc == fourcc ||
                    formats[i].unpacked_fourcc == fourcc)
                        return &formats[i];
        }

        return NULL;
}

static void unicam_calc_image_size_bpl(struct unicam_device *unicam,
                                       const struct unicam_format_info *fmtinfo,
                                       struct v4l2_pix_format *pix)
{
        u32 min_bpl;

        v4l_bound_align_image(&pix->width, UNICAM_IMAGE_MIN_WIDTH,
                              UNICAM_IMAGE_MAX_WIDTH, 2,
                              &pix->height, UNICAM_IMAGE_MIN_HEIGHT,
                              UNICAM_IMAGE_MAX_HEIGHT, 0, 0);

        /* Unpacking always goes to 16bpp */
        if (pix->pixelformat == fmtinfo->unpacked_fourcc)
                min_bpl = pix->width * 2;
        else
                min_bpl = pix->width * fmtinfo->depth / 8;
        min_bpl = ALIGN(min_bpl, UNICAM_IMAGE_BPL_ALIGNMENT);

        pix->bytesperline = ALIGN(pix->bytesperline, UNICAM_IMAGE_BPL_ALIGNMENT);
        pix->bytesperline = clamp_t(unsigned int, pix->bytesperline, min_bpl,
                                    UNICAM_IMAGE_MAX_BPL);

        pix->sizeimage = pix->height * pix->bytesperline;
}

static void unicam_calc_meta_size_bpl(struct unicam_device *unicam,
                                      const struct unicam_format_info *fmtinfo,
                                      struct v4l2_meta_format *meta)
{
        v4l_bound_align_image(&meta->width, UNICAM_META_MIN_WIDTH,
                              UNICAM_META_MAX_WIDTH, 0,
                              &meta->height, UNICAM_META_MIN_HEIGHT,
                              UNICAM_META_MAX_HEIGHT, 0, 0);

        meta->bytesperline = ALIGN(meta->width * fmtinfo->depth / 8,
                                   UNICAM_DMA_BPL_ALIGNMENT);
        meta->buffersize = meta->height * meta->bytesperline;
}

/* -----------------------------------------------------------------------------
 * Hardware handling
 */

static inline void unicam_clk_write(struct unicam_device *unicam, u32 val)
{
        /* Pass the CM_PASSWORD along with the value. */
        writel(val | 0x5a000000, unicam->clk_gate_base);
}

static inline u32 unicam_reg_read(struct unicam_device *unicam, u32 offset)
{
        return readl(unicam->base + offset);
}

static inline void unicam_reg_write(struct unicam_device *unicam, u32 offset, u32 val)
{
        writel(val, unicam->base + offset);
}

static inline int unicam_get_field(u32 value, u32 mask)
{
        return (value & mask) >> __ffs(mask);
}

static inline void unicam_set_field(u32 *valp, u32 field, u32 mask)
{
        u32 val = *valp;

        val &= ~mask;
        val |= (field << __ffs(mask)) & mask;
        *valp = val;
}

static inline void unicam_reg_write_field(struct unicam_device *unicam, u32 offset,
                                          u32 field, u32 mask)
{
        u32 val = unicam_reg_read(unicam, offset);

        unicam_set_field(&val, field, mask);
        unicam_reg_write(unicam, offset, val);
}

static void unicam_wr_dma_addr(struct unicam_node *node,
                               struct unicam_buffer *buf)
{
        /*
         * Due to a HW bug causing buffer overruns in circular buffer mode under
         * certain (not yet fully known) conditions, the dummy buffer allocation
         * is set to a a single page size, but the hardware gets programmed with
         * a buffer size of 0.
         */
        dma_addr_t endaddr = buf->dma_addr +
                             (buf != &node->dummy_buf ? buf->size : 0);

        if (node->id == UNICAM_IMAGE_NODE) {
                unicam_reg_write(node->dev, UNICAM_IBSA0, buf->dma_addr);
                unicam_reg_write(node->dev, UNICAM_IBEA0, endaddr);
        } else {
                unicam_reg_write(node->dev, UNICAM_DBSA0, buf->dma_addr);
                unicam_reg_write(node->dev, UNICAM_DBEA0, endaddr);
        }
}

static unsigned int unicam_get_lines_done(struct unicam_device *unicam)
{
        struct unicam_node *node = &unicam->node[UNICAM_IMAGE_NODE];
        unsigned int stride = node->fmt.fmt.pix.bytesperline;
        struct unicam_buffer *frm = node->cur_frm;
        dma_addr_t cur_addr;

        if (!frm)
                return 0;

        cur_addr = unicam_reg_read(unicam, UNICAM_IBWP);
        return (unsigned int)(cur_addr - frm->dma_addr) / stride;
}

static void unicam_schedule_next_buffer(struct unicam_node *node)
{
        struct unicam_buffer *buf;

        buf = list_first_entry(&node->dma_queue, struct unicam_buffer, list);
        node->next_frm = buf;
        list_del(&buf->list);

        unicam_wr_dma_addr(node, buf);
}

static void unicam_schedule_dummy_buffer(struct unicam_node *node)
{
        int node_id = is_image_node(node) ? UNICAM_IMAGE_NODE : UNICAM_METADATA_NODE;

        dev_dbg(node->dev->dev, "Scheduling dummy buffer for node %d\n", node_id);

        unicam_wr_dma_addr(node, &node->dummy_buf);

        node->next_frm = NULL;
}

static void unicam_process_buffer_complete(struct unicam_node *node,
                                           unsigned int sequence)
{
        node->cur_frm->vb.field = node->fmt.fmt.pix.field;
        node->cur_frm->vb.sequence = sequence;

        vb2_buffer_done(&node->cur_frm->vb.vb2_buf, VB2_BUF_STATE_DONE);
}

static void unicam_queue_event_sof(struct unicam_device *unicam)
{
        struct unicam_node *node = &unicam->node[UNICAM_IMAGE_NODE];
        struct v4l2_event event = {
                .type = V4L2_EVENT_FRAME_SYNC,
                .u.frame_sync.frame_sequence = unicam->sequence,
        };

        v4l2_event_queue(&node->video_dev, &event);
}

static irqreturn_t unicam_isr(int irq, void *dev)
{
        struct unicam_device *unicam = dev;
        unsigned int lines_done = unicam_get_lines_done(dev);
        unsigned int sequence = unicam->sequence;
        unsigned int i;
        u32 ista, sta;
        bool fe;
        u64 ts;

        sta = unicam_reg_read(unicam, UNICAM_STA);
        /* Write value back to clear the interrupts */
        unicam_reg_write(unicam, UNICAM_STA, sta);

        ista = unicam_reg_read(unicam, UNICAM_ISTA);
        /* Write value back to clear the interrupts */
        unicam_reg_write(unicam, UNICAM_ISTA, ista);

        dev_dbg(unicam->dev, "ISR: ISTA: 0x%X, STA: 0x%X, sequence %d, lines done %d\n",
                ista, sta, sequence, lines_done);

        if (!(sta & (UNICAM_IS | UNICAM_PI0)))
                return IRQ_HANDLED;

        /*
         * Look for either the Frame End interrupt or the Packet Capture status
         * to signal a frame end.
         */
        fe = ista & UNICAM_FEI || sta & UNICAM_PI0;

        /*
         * We must run the frame end handler first. If we have a valid next_frm
         * and we get a simultaneout FE + FS interrupt, running the FS handler
         * first would null out the next_frm ptr and we would have lost the
         * buffer forever.
         */
        if (fe) {
                bool inc_seq = unicam->frame_started;

                /*
                 * Ensure we have swapped buffers already as we can't
                 * stop the peripheral. If no buffer is available, use a
                 * dummy buffer to dump out frames until we get a new buffer
                 * to use.
                 */
                for (i = 0; i < ARRAY_SIZE(unicam->node); i++) {
                        struct unicam_node *node = &unicam->node[i];

                        if (!vb2_start_streaming_called(&node->buffer_queue))
                                continue;

                        /*
                         * If cur_frm == next_frm, it means we have not had
                         * a chance to swap buffers, likely due to having
                         * multiple interrupts occurring simultaneously (like FE
                         * + FS + LS). In this case, we cannot signal the buffer
                         * as complete, as the HW will reuse that buffer.
                         */
                        if (node->cur_frm && node->cur_frm != node->next_frm) {
                                unicam_process_buffer_complete(node, sequence);
                                inc_seq = true;
                        }
                        node->cur_frm = node->next_frm;
                }

                /*
                 * Increment the sequence number conditionally on either a FS
                 * having already occurred, or in the FE + FS condition as
                 * caught in the FE handler above. This ensures the sequence
                 * number corresponds to the frames generated by the sensor, not
                 * the frames dequeued to userland.
                 */
                if (inc_seq) {
                        unicam->sequence++;
                        unicam->frame_started = false;
                }
        }

        if (ista & UNICAM_FSI) {
                /*
                 * Timestamp is to be when the first data byte was captured,
                 * aka frame start.
                 */
                ts = ktime_get_ns();
                for (i = 0; i < ARRAY_SIZE(unicam->node); i++) {
                        struct unicam_node *node = &unicam->node[i];

                        if (!vb2_start_streaming_called(&node->buffer_queue))
                                continue;

                        if (node->cur_frm)
                                node->cur_frm->vb.vb2_buf.timestamp = ts;
                        else
                                dev_dbg(unicam->v4l2_dev.dev,
                                        "ISR: [%d] Dropping frame, buffer not available at FS\n",
                                        i);
                        /*
                         * Set the next frame output to go to a dummy frame
                         * if we have not managed to obtain another frame
                         * from the queue.
                         */
                        unicam_schedule_dummy_buffer(node);
                }

                unicam_queue_event_sof(unicam);
                unicam->frame_started = true;
        }

        /*
         * Cannot swap buffer at frame end, there may be a race condition
         * where the HW does not actually swap it if the new frame has
         * already started.
         */
        if (ista & (UNICAM_FSI | UNICAM_LCI) && !fe) {
                for (i = 0; i < ARRAY_SIZE(unicam->node); i++) {
                        struct unicam_node *node = &unicam->node[i];

                        if (!vb2_start_streaming_called(&node->buffer_queue))
                                continue;

                        spin_lock(&node->dma_queue_lock);
                        if (!list_empty(&node->dma_queue) && !node->next_frm)
                                unicam_schedule_next_buffer(node);
                        spin_unlock(&node->dma_queue_lock);
                }
        }

        return IRQ_HANDLED;
}

static void unicam_set_packing_config(struct unicam_device *unicam,
                                      const struct unicam_format_info *fmtinfo)
{
        struct unicam_node *node = &unicam->node[UNICAM_IMAGE_NODE];
        u32 pack, unpack;
        u32 val;

        if (node->fmt.fmt.pix.pixelformat == fmtinfo->fourcc) {
                unpack = UNICAM_PUM_NONE;
                pack = UNICAM_PPM_NONE;
        } else {
                unpack = fmtinfo->unpack;
                /* Repacking is always to 16bpp */
                pack = UNICAM_PPM_PACK16;
        }

        val = 0;
        unicam_set_field(&val, unpack, UNICAM_PUM_MASK);
        unicam_set_field(&val, pack, UNICAM_PPM_MASK);
        unicam_reg_write(unicam, UNICAM_IPIPE, val);
}

static void unicam_cfg_image_id(struct unicam_device *unicam, u8 vc, u8 dt)
{
        if (unicam->bus_type == V4L2_MBUS_CSI2_DPHY) {
                /* CSI2 mode  */
                unicam_reg_write(unicam, UNICAM_IDI0, (vc << 6) | dt);
        } else {
                /* CCP2 mode */
                unicam_reg_write(unicam, UNICAM_IDI0, 0x80 | dt);
        }
}

static void unicam_enable_ed(struct unicam_device *unicam)
{
        u32 val = unicam_reg_read(unicam, UNICAM_DCS);

        unicam_set_field(&val, 2, UNICAM_EDL_MASK);
        /* Do not wrap at the end of the embedded data buffer */
        unicam_set_field(&val, 0, UNICAM_DBOB);

        unicam_reg_write(unicam, UNICAM_DCS, val);
}

static int unicam_get_image_vc_dt(struct unicam_device *unicam,
                                  struct v4l2_subdev_state *state,
                                  u8 *vc, u8 *dt)
{
        struct v4l2_mbus_frame_desc fd;
        u32 stream;
        int ret;

        ret = v4l2_subdev_routing_find_opposite_end(&state->routing,
                                                    UNICAM_SD_PAD_SOURCE_IMAGE,
                                                    0, NULL, &stream);
        if (ret)
                return ret;

        ret = v4l2_subdev_call(unicam->sensor.subdev, pad, get_frame_desc,
                               unicam->sensor.pad->index, &fd);
        if (ret)
                return ret;

        /* Only CSI-2 supports DTs. */
        if (fd.type != V4L2_MBUS_FRAME_DESC_TYPE_CSI2)
                return -EINVAL;

        for (unsigned int i = 0; i < fd.num_entries; ++i) {
                const struct v4l2_mbus_frame_desc_entry *fde = &fd.entry[i];

                if (fde->stream == stream) {
                        *vc = fde->bus.csi2.vc;
                        *dt = fde->bus.csi2.dt;
                        return 0;
                }
        }

        return -EINVAL;
}

static void unicam_start_rx(struct unicam_device *unicam,
                            struct v4l2_subdev_state *state)
{
        struct unicam_node *node = &unicam->node[UNICAM_IMAGE_NODE];
        const struct unicam_format_info *fmtinfo;
        const struct v4l2_mbus_framefmt *fmt;
        unsigned int line_int_freq;
        u8 vc, dt;
        u32 val;
        int ret;

        fmt = v4l2_subdev_state_get_format(state, UNICAM_SD_PAD_SOURCE_IMAGE, 0);
        fmtinfo = unicam_find_format_by_code(fmt->code,
                                             UNICAM_SD_PAD_SOURCE_IMAGE);
        if (WARN_ON(!fmtinfo))
                return;

        /*
         * Enable lane clocks. The register is structured as follows:
         *
         * [9:8] - DAT3
         * [7:6] - DAT2
         * [5:4] - DAT1
         * [3:2] - DAT0
         * [1:0] - CLK
         *
         * Enabled lane must be set to b01, and disabled lanes to b00. The clock
         * lane is always enabled.
         */
        val = 0x155 & GENMASK(unicam->pipe.num_data_lanes * 2 + 1, 0);
        unicam_clk_write(unicam, val);

        /* Basic init */
        unicam_reg_write(unicam, UNICAM_CTRL, UNICAM_MEM);

        /* Enable analogue control, and leave in reset. */
        val = UNICAM_AR;
        unicam_set_field(&val, 7, UNICAM_CTATADJ_MASK);
        unicam_set_field(&val, 7, UNICAM_PTATADJ_MASK);
        unicam_reg_write(unicam, UNICAM_ANA, val);
        usleep_range(1000, 2000);

        /* Come out of reset */
        unicam_reg_write_field(unicam, UNICAM_ANA, 0, UNICAM_AR);

        /* Peripheral reset */
        unicam_reg_write_field(unicam, UNICAM_CTRL, 1, UNICAM_CPR);
        unicam_reg_write_field(unicam, UNICAM_CTRL, 0, UNICAM_CPR);

        unicam_reg_write_field(unicam, UNICAM_CTRL, 0, UNICAM_CPE);

        /* Enable Rx control. */
        val = unicam_reg_read(unicam, UNICAM_CTRL);
        if (unicam->bus_type == V4L2_MBUS_CSI2_DPHY) {
                unicam_set_field(&val, UNICAM_CPM_CSI2, UNICAM_CPM_MASK);
                unicam_set_field(&val, UNICAM_DCM_STROBE, UNICAM_DCM_MASK);
        } else {
                unicam_set_field(&val, UNICAM_CPM_CCP2, UNICAM_CPM_MASK);
                unicam_set_field(&val, unicam->bus_flags, UNICAM_DCM_MASK);
        }
        /* Packet framer timeout */
        unicam_set_field(&val, 0xf, UNICAM_PFT_MASK);
        unicam_set_field(&val, 128, UNICAM_OET_MASK);
        unicam_reg_write(unicam, UNICAM_CTRL, val);

        unicam_reg_write(unicam, UNICAM_IHWIN, 0);
        unicam_reg_write(unicam, UNICAM_IVWIN, 0);

        /* AXI bus access QoS setup */
        val = unicam_reg_read(unicam, UNICAM_PRI);
        unicam_set_field(&val, 0, UNICAM_BL_MASK);
        unicam_set_field(&val, 0, UNICAM_BS_MASK);
        unicam_set_field(&val, 0xe, UNICAM_PP_MASK);
        unicam_set_field(&val, 8, UNICAM_NP_MASK);
        unicam_set_field(&val, 2, UNICAM_PT_MASK);
        unicam_set_field(&val, 1, UNICAM_PE);
        unicam_reg_write(unicam, UNICAM_PRI, val);

        unicam_reg_write_field(unicam, UNICAM_ANA, 0, UNICAM_DDL);

        val = UNICAM_FSIE | UNICAM_FEIE | UNICAM_IBOB;
        line_int_freq = max(fmt->height >> 2, 128);
        unicam_set_field(&val, line_int_freq, UNICAM_LCIE_MASK);
        unicam_reg_write(unicam, UNICAM_ICTL, val);
        unicam_reg_write(unicam, UNICAM_STA, UNICAM_STA_MASK_ALL);
        unicam_reg_write(unicam, UNICAM_ISTA, UNICAM_ISTA_MASK_ALL);

        /* tclk_term_en */
        unicam_reg_write_field(unicam, UNICAM_CLT, 2, UNICAM_CLT1_MASK);
        /* tclk_settle */
        unicam_reg_write_field(unicam, UNICAM_CLT, 6, UNICAM_CLT2_MASK);
        /* td_term_en */
        unicam_reg_write_field(unicam, UNICAM_DLT, 2, UNICAM_DLT1_MASK);
        /* ths_settle */
        unicam_reg_write_field(unicam, UNICAM_DLT, 6, UNICAM_DLT2_MASK);
        /* trx_enable */
        unicam_reg_write_field(unicam, UNICAM_DLT, 0, UNICAM_DLT3_MASK);

        unicam_reg_write_field(unicam, UNICAM_CTRL, 0, UNICAM_SOE);

        /* Packet compare setup - required to avoid missing frame ends */
        val = 0;
        unicam_set_field(&val, 1, UNICAM_PCE);
        unicam_set_field(&val, 1, UNICAM_GI);
        unicam_set_field(&val, 1, UNICAM_CPH);
        unicam_set_field(&val, 0, UNICAM_PCVC_MASK);
        unicam_set_field(&val, 1, UNICAM_PCDT_MASK);
        unicam_reg_write(unicam, UNICAM_CMP0, val);

        /* Enable clock lane and set up terminations */
        val = 0;
        if (unicam->bus_type == V4L2_MBUS_CSI2_DPHY) {
                /* CSI2 */
                unicam_set_field(&val, 1, UNICAM_CLE);
                unicam_set_field(&val, 1, UNICAM_CLLPE);
                if (!(unicam->bus_flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK)) {
                        unicam_set_field(&val, 1, UNICAM_CLTRE);
                        unicam_set_field(&val, 1, UNICAM_CLHSE);
                }
        } else {
                /* CCP2 */
                unicam_set_field(&val, 1, UNICAM_CLE);
                unicam_set_field(&val, 1, UNICAM_CLHSE);
                unicam_set_field(&val, 1, UNICAM_CLTRE);
        }
        unicam_reg_write(unicam, UNICAM_CLK, val);

        /*
         * Enable required data lanes with appropriate terminations.
         * The same value needs to be written to UNICAM_DATn registers for
         * the active lanes, and 0 for inactive ones.
         */
        val = 0;
        if (unicam->bus_type == V4L2_MBUS_CSI2_DPHY) {
                /* CSI2 */
                unicam_set_field(&val, 1, UNICAM_DLE);
                unicam_set_field(&val, 1, UNICAM_DLLPE);
                if (!(unicam->bus_flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK)) {
                        unicam_set_field(&val, 1, UNICAM_DLTRE);
                        unicam_set_field(&val, 1, UNICAM_DLHSE);
                }
        } else {
                /* CCP2 */
                unicam_set_field(&val, 1, UNICAM_DLE);
                unicam_set_field(&val, 1, UNICAM_DLHSE);
                unicam_set_field(&val, 1, UNICAM_DLTRE);
        }
        unicam_reg_write(unicam, UNICAM_DAT0, val);

        if (unicam->pipe.num_data_lanes == 1)
                val = 0;
        unicam_reg_write(unicam, UNICAM_DAT1, val);

        if (unicam->max_data_lanes > 2) {
                /*
                 * Registers UNICAM_DAT2 and UNICAM_DAT3 only valid if the
                 * instance supports more than 2 data lanes.
                 */
                if (unicam->pipe.num_data_lanes == 2)
                        val = 0;
                unicam_reg_write(unicam, UNICAM_DAT2, val);

                if (unicam->pipe.num_data_lanes == 3)
                        val = 0;
                unicam_reg_write(unicam, UNICAM_DAT3, val);
        }

        unicam_reg_write(unicam, UNICAM_IBLS,
                         node->fmt.fmt.pix.bytesperline);
        unicam_wr_dma_addr(node, node->cur_frm);
        unicam_set_packing_config(unicam, fmtinfo);

        ret = unicam_get_image_vc_dt(unicam, state, &vc, &dt);
        if (ret) {
                /*
                 * If the source doesn't support frame descriptors, default to
                 * VC 0 and use the DT corresponding to the format.
                 */
                vc = 0;
                dt = fmtinfo->csi_dt;
        }

        unicam_cfg_image_id(unicam, vc, dt);

        val = unicam_reg_read(unicam, UNICAM_MISC);
        unicam_set_field(&val, 1, UNICAM_FL0);
        unicam_set_field(&val, 1, UNICAM_FL1);
        unicam_reg_write(unicam, UNICAM_MISC, val);

        /* Enable peripheral */
        unicam_reg_write_field(unicam, UNICAM_CTRL, 1, UNICAM_CPE);

        /* Load image pointers */
        unicam_reg_write_field(unicam, UNICAM_ICTL, 1, UNICAM_LIP_MASK);

        /*
         * Enable trigger only for the first frame to
         * sync correctly to the FS from the source.
         */
        unicam_reg_write_field(unicam, UNICAM_ICTL, 1, UNICAM_TFC);
}

static void unicam_start_metadata(struct unicam_device *unicam)
{
        struct unicam_node *node = &unicam->node[UNICAM_METADATA_NODE];

        unicam_enable_ed(unicam);
        unicam_wr_dma_addr(node, node->cur_frm);
        unicam_reg_write_field(unicam, UNICAM_DCS, 1, UNICAM_LDP);
}

static void unicam_disable(struct unicam_device *unicam)
{
        /* Analogue lane control disable */
        unicam_reg_write_field(unicam, UNICAM_ANA, 1, UNICAM_DDL);

        /* Stop the output engine */
        unicam_reg_write_field(unicam, UNICAM_CTRL, 1, UNICAM_SOE);

        /* Disable the data lanes. */
        unicam_reg_write(unicam, UNICAM_DAT0, 0);
        unicam_reg_write(unicam, UNICAM_DAT1, 0);

        if (unicam->max_data_lanes > 2) {
                unicam_reg_write(unicam, UNICAM_DAT2, 0);
                unicam_reg_write(unicam, UNICAM_DAT3, 0);
        }

        /* Peripheral reset */
        unicam_reg_write_field(unicam, UNICAM_CTRL, 1, UNICAM_CPR);
        usleep_range(50, 100);
        unicam_reg_write_field(unicam, UNICAM_CTRL, 0, UNICAM_CPR);

        /* Disable peripheral */
        unicam_reg_write_field(unicam, UNICAM_CTRL, 0, UNICAM_CPE);

        /* Clear ED setup */
        unicam_reg_write(unicam, UNICAM_DCS, 0);

        /* Disable all lane clocks */
        unicam_clk_write(unicam, 0);
}

/* -----------------------------------------------------------------------------
 * V4L2 subdev operations
 */

static int __unicam_subdev_set_routing(struct v4l2_subdev *sd,
                                       struct v4l2_subdev_state *state,
                                       struct v4l2_subdev_krouting *routing)
{
        struct v4l2_subdev_route *route;
        int ret;

        ret = v4l2_subdev_routing_validate(sd, routing,
                                           V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
        if (ret)
                return ret;

        ret = v4l2_subdev_set_routing(sd, state, routing);
        if (ret)
                return ret;

        for_each_active_route(&state->routing, route) {
                const struct v4l2_mbus_framefmt *def_fmt;
                struct v4l2_mbus_framefmt *fmt;

                if (route->source_pad == UNICAM_SD_PAD_SOURCE_IMAGE)
                        def_fmt = &unicam_default_image_format;
                else
                        def_fmt = &unicam_default_meta_format;

                fmt = v4l2_subdev_state_get_format(state, route->sink_pad,
                                                   route->sink_stream);
                *fmt = *def_fmt;
                fmt = v4l2_subdev_state_get_format(state, route->source_pad,
                                                   route->source_stream);
                *fmt = *def_fmt;
        }

        return 0;
}

static int unicam_subdev_init_state(struct v4l2_subdev *sd,
                                    struct v4l2_subdev_state *state)
{
        struct v4l2_subdev_route routes[] = {
                {
                        .sink_pad = UNICAM_SD_PAD_SINK,
                        .sink_stream = 0,
                        .source_pad = UNICAM_SD_PAD_SOURCE_IMAGE,
                        .source_stream = 0,
                        .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
                },
        };

        struct v4l2_subdev_krouting routing = {
                .len_routes = ARRAY_SIZE(routes),
                .num_routes = ARRAY_SIZE(routes),
                .routes = routes,
        };

        /* Initialize routing to single route to the fist source pad. */
        return __unicam_subdev_set_routing(sd, state, &routing);
}

static int unicam_subdev_enum_mbus_code(struct v4l2_subdev *sd,
                                        struct v4l2_subdev_state *state,
                                        struct v4l2_subdev_mbus_code_enum *code)
{
        u32 pad, stream;
        int ret;

        ret = v4l2_subdev_routing_find_opposite_end(&state->routing,
                                                    code->pad, code->stream,
                                                    &pad, &stream);
        if (ret)
                return ret;

        if (unicam_sd_pad_is_source(code->pad)) {
                /* No transcoding, source and sink codes must match. */
                const struct v4l2_mbus_framefmt *fmt;

                fmt = v4l2_subdev_state_get_format(state, pad, stream);
                if (!fmt)
                        return -EINVAL;

                if (code->index > 0)
                        return -EINVAL;

                code->code = fmt->code;
        } else {
                const struct unicam_format_info *formats;
                unsigned int num_formats;

                if (pad == UNICAM_SD_PAD_SOURCE_IMAGE) {
                        formats = unicam_image_formats;
                        num_formats = ARRAY_SIZE(unicam_image_formats);
                } else {
                        formats = unicam_meta_formats;
                        num_formats = ARRAY_SIZE(unicam_meta_formats);
                }

                if (code->index >= num_formats)
                        return -EINVAL;

                code->code = formats[code->index].code;
        }

        return 0;
}

static int unicam_subdev_enum_frame_size(struct v4l2_subdev *sd,
                                         struct v4l2_subdev_state *state,
                                         struct v4l2_subdev_frame_size_enum *fse)
{
        u32 pad, stream;
        int ret;

        if (fse->index > 0)
                return -EINVAL;

        ret = v4l2_subdev_routing_find_opposite_end(&state->routing, fse->pad,
                                                    fse->stream, &pad,
                                                    &stream);
        if (ret)
                return ret;

        if (unicam_sd_pad_is_source(fse->pad)) {
                /* No transcoding, source and sink formats must match. */
                const struct v4l2_mbus_framefmt *fmt;

                fmt = v4l2_subdev_state_get_format(state, pad, stream);
                if (!fmt)
                        return -EINVAL;

                if (fse->code != fmt->code)
                        return -EINVAL;

                fse->min_width = fmt->width;
                fse->max_width = fmt->width;
                fse->min_height = fmt->height;
                fse->max_height = fmt->height;
        } else {
                const struct unicam_format_info *fmtinfo;

                fmtinfo = unicam_find_format_by_code(fse->code, pad);
                if (!fmtinfo)
                        return -EINVAL;

                if (pad == UNICAM_SD_PAD_SOURCE_IMAGE) {
                        fse->min_width = UNICAM_IMAGE_MIN_WIDTH;
                        fse->max_width = UNICAM_IMAGE_MAX_WIDTH;
                        fse->min_height = UNICAM_IMAGE_MIN_HEIGHT;
                        fse->max_height = UNICAM_IMAGE_MAX_HEIGHT;
                } else {
                        fse->min_width = UNICAM_META_MIN_WIDTH;
                        fse->max_width = UNICAM_META_MAX_WIDTH;
                        fse->min_height = UNICAM_META_MIN_HEIGHT;
                        fse->max_height = UNICAM_META_MAX_HEIGHT;
                }
        }

        return 0;
}

static int unicam_subdev_set_format(struct v4l2_subdev *sd,
                                    struct v4l2_subdev_state *state,
                                    struct v4l2_subdev_format *format)
{
        struct unicam_device *unicam = sd_to_unicam_device(sd);
        struct v4l2_mbus_framefmt *sink_format, *source_format;
        const struct unicam_format_info *fmtinfo;
        u32 source_pad, source_stream;
        int ret;

        if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE &&
            unicam->subdev.enabled_streams)
                return -EBUSY;

        /* No transcoding, source and sink formats must match. */
        if (unicam_sd_pad_is_source(format->pad))
                return v4l2_subdev_get_fmt(sd, state, format);

        /*
         * Allowed formats for the stream on the sink pad depend on what source
         * pad the stream is routed to. Find the corresponding source pad and
         * use it to validate the media bus code.
         */
        ret = v4l2_subdev_routing_find_opposite_end(&state->routing,
                                                    format->pad, format->stream,
                                                    &source_pad, &source_stream);
        if (ret)
                return ret;

        fmtinfo = unicam_find_format_by_code(format->format.code, source_pad);
        if (!fmtinfo) {
                fmtinfo = source_pad == UNICAM_SD_PAD_SOURCE_IMAGE
                        ? &unicam_image_formats[0] : &unicam_meta_formats[0];
                format->format.code = fmtinfo->code;
        }

        if (source_pad == UNICAM_SD_PAD_SOURCE_IMAGE) {
                format->format.width = clamp_t(unsigned int,
                                               format->format.width,
                                               UNICAM_IMAGE_MIN_WIDTH,
                                               UNICAM_IMAGE_MAX_WIDTH);
                format->format.height = clamp_t(unsigned int,
                                                format->format.height,
                                                UNICAM_IMAGE_MIN_HEIGHT,
                                                UNICAM_IMAGE_MAX_HEIGHT);
                format->format.field = V4L2_FIELD_NONE;
        } else {
                format->format.width = clamp_t(unsigned int,
                                               format->format.width,
                                               UNICAM_META_MIN_WIDTH,
                                               UNICAM_META_MAX_WIDTH);
                format->format.height = clamp_t(unsigned int,
                                                format->format.height,
                                                UNICAM_META_MIN_HEIGHT,
                                                UNICAM_META_MAX_HEIGHT);
                format->format.field = V4L2_FIELD_NONE;

                /* Colorspace don't apply to metadata. */
                format->format.colorspace = 0;
                format->format.ycbcr_enc = 0;
                format->format.quantization = 0;
                format->format.xfer_func = 0;
        }

        sink_format = v4l2_subdev_state_get_format(state, format->pad,
                                                   format->stream);
        source_format = v4l2_subdev_state_get_format(state, source_pad,
                                                     source_stream);
        *sink_format = format->format;
        *source_format = format->format;

        return 0;
}

static int unicam_subdev_set_routing(struct v4l2_subdev *sd,
                                     struct v4l2_subdev_state *state,
                                     enum v4l2_subdev_format_whence which,
                                     struct v4l2_subdev_krouting *routing)
{
        struct unicam_device *unicam = sd_to_unicam_device(sd);

        if (which == V4L2_SUBDEV_FORMAT_ACTIVE && unicam->subdev.enabled_streams)
                return -EBUSY;

        return __unicam_subdev_set_routing(sd, state, routing);
}

static int unicam_sd_enable_streams(struct v4l2_subdev *sd,
                                    struct v4l2_subdev_state *state, u32 pad,
                                    u64 streams_mask)
{
        struct unicam_device *unicam = sd_to_unicam_device(sd);
        u32 other_pad, other_stream;
        int ret;

        if (!unicam->subdev.enabled_streams) {
                /* Configure and start Unicam. */
                unicam->sequence = 0;

                if (unicam->pipe.nodes & BIT(UNICAM_METADATA_NODE))
                        unicam_start_metadata(unicam);

                unicam->frame_started = false;
                unicam_start_rx(unicam, state);
        }

        ret = v4l2_subdev_routing_find_opposite_end(&state->routing, pad, 0,
                                                    &other_pad, &other_stream);
        if (ret)
                return ret;

        ret = v4l2_subdev_enable_streams(unicam->sensor.subdev,
                                         unicam->sensor.pad->index,
                                         BIT(other_stream));
        if (ret) {
                dev_err(unicam->dev, "stream on failed in subdev\n");
                return ret;
        }

        unicam->subdev.enabled_streams |= BIT(other_stream);

        return 0;
}

static int unicam_sd_disable_streams(struct v4l2_subdev *sd,
                                     struct v4l2_subdev_state *state, u32 pad,
                                     u64 streams_mask)
{
        struct unicam_device *unicam = sd_to_unicam_device(sd);
        u32 other_pad, other_stream;
        int ret;

        ret = v4l2_subdev_routing_find_opposite_end(&state->routing, pad, 0,
                                                    &other_pad, &other_stream);
        if (ret)
                return ret;

        v4l2_subdev_disable_streams(unicam->sensor.subdev,
                                    unicam->sensor.pad->index,
                                    BIT(other_stream));

        unicam->subdev.enabled_streams &= ~BIT(other_stream);

        if (!unicam->subdev.enabled_streams)
                unicam_disable(unicam);

        return 0;
}

static const struct v4l2_subdev_pad_ops unicam_subdev_pad_ops = {
        .enum_mbus_code         = unicam_subdev_enum_mbus_code,
        .enum_frame_size        = unicam_subdev_enum_frame_size,
        .get_fmt                = v4l2_subdev_get_fmt,
        .set_fmt                = unicam_subdev_set_format,
        .set_routing            = unicam_subdev_set_routing,
        .enable_streams         = unicam_sd_enable_streams,
        .disable_streams        = unicam_sd_disable_streams,
};

static const struct v4l2_subdev_ops unicam_subdev_ops = {
        .pad                    = &unicam_subdev_pad_ops,
};

static const struct v4l2_subdev_internal_ops unicam_subdev_internal_ops = {
        .init_state             = unicam_subdev_init_state,
};

static const struct media_entity_operations unicam_subdev_media_ops = {
        .link_validate          = v4l2_subdev_link_validate,
        .has_pad_interdep       = v4l2_subdev_has_pad_interdep,
};

static int unicam_subdev_init(struct unicam_device *unicam)
{
        struct v4l2_subdev *sd = &unicam->subdev.sd;
        int ret;

        v4l2_subdev_init(sd, &unicam_subdev_ops);
        sd->internal_ops = &unicam_subdev_internal_ops;
        v4l2_set_subdevdata(sd, unicam);

        sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
        sd->entity.ops = &unicam_subdev_media_ops;
        sd->dev = unicam->dev;
        sd->owner = THIS_MODULE;
        sd->flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;

        strscpy(sd->name, "unicam", sizeof(sd->name));

        unicam->subdev.pads[UNICAM_SD_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
        unicam->subdev.pads[UNICAM_SD_PAD_SOURCE_IMAGE].flags = MEDIA_PAD_FL_SOURCE;
        unicam->subdev.pads[UNICAM_SD_PAD_SOURCE_METADATA].flags = MEDIA_PAD_FL_SOURCE;

        ret = media_entity_pads_init(&sd->entity, ARRAY_SIZE(unicam->subdev.pads),
                                     unicam->subdev.pads);
        if (ret) {
                dev_err(unicam->dev, "Failed to initialize media entity: %d\n",
                        ret);
                return ret;
        }

        ret = v4l2_subdev_init_finalize(sd);
        if (ret) {
                dev_err(unicam->dev, "Failed to initialize subdev: %d\n", ret);
                goto err_entity;
        }

        ret = v4l2_device_register_subdev(&unicam->v4l2_dev, sd);
        if (ret) {
                dev_err(unicam->dev, "Failed to register subdev: %d\n", ret);
                goto err_subdev;
        }

        return 0;

err_subdev:
        v4l2_subdev_cleanup(sd);
err_entity:
        media_entity_cleanup(&sd->entity);
        return ret;
}

static void unicam_subdev_cleanup(struct unicam_device *unicam)
{
        v4l2_subdev_cleanup(&unicam->subdev.sd);
        media_entity_cleanup(&unicam->subdev.sd.entity);
}

/* -----------------------------------------------------------------------------
 * Videobuf2 queue operations
 */

static int unicam_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
                              unsigned int *nplanes, unsigned int sizes[],
                              struct device *alloc_devs[])
{
        struct unicam_node *node = vb2_get_drv_priv(vq);
        u32 size = is_image_node(node) ? node->fmt.fmt.pix.sizeimage
                 : node->fmt.fmt.meta.buffersize;

        if (*nplanes) {
                if (sizes[0] < size) {
                        dev_dbg(node->dev->dev, "sizes[0] %i < size %u\n",
                                sizes[0], size);
                        return -EINVAL;
                }
                size = sizes[0];
        }

        *nplanes = 1;
        sizes[0] = size;

        return 0;
}

static int unicam_buffer_prepare(struct vb2_buffer *vb)
{
        struct unicam_node *node = vb2_get_drv_priv(vb->vb2_queue);
        struct unicam_buffer *buf = to_unicam_buffer(vb);
        u32 size = is_image_node(node) ? node->fmt.fmt.pix.sizeimage
                 : node->fmt.fmt.meta.buffersize;

        if (vb2_plane_size(vb, 0) < size) {
                dev_dbg(node->dev->dev,
                        "data will not fit into plane (%lu < %u)\n",
                        vb2_plane_size(vb, 0), size);
                return -EINVAL;
        }

        buf->dma_addr = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
        buf->size = size;

        vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);

        return 0;
}

static void unicam_return_buffers(struct unicam_node *node,
                                  enum vb2_buffer_state state)
{
        struct unicam_buffer *buf, *tmp;

        list_for_each_entry_safe(buf, tmp, &node->dma_queue, list) {
                list_del(&buf->list);
                vb2_buffer_done(&buf->vb.vb2_buf, state);
        }

        if (node->cur_frm)
                vb2_buffer_done(&node->cur_frm->vb.vb2_buf,
                                state);
        if (node->next_frm && node->cur_frm != node->next_frm)
                vb2_buffer_done(&node->next_frm->vb.vb2_buf,
                                state);

        node->cur_frm = NULL;
        node->next_frm = NULL;
}

static int unicam_num_data_lanes(struct unicam_device *unicam)
{
        struct v4l2_mbus_config mbus_config = { 0 };
        unsigned int num_data_lanes;
        int ret;

        if (unicam->bus_type != V4L2_MBUS_CSI2_DPHY)
                return unicam->max_data_lanes;

        ret = v4l2_subdev_call(unicam->sensor.subdev, pad, get_mbus_config,
                               unicam->sensor.pad->index, &mbus_config);
        if (ret == -ENOIOCTLCMD)
                return unicam->max_data_lanes;

        if (ret < 0) {
                dev_err(unicam->dev, "Failed to get mbus config: %d\n", ret);
                return ret;
        }

        num_data_lanes = mbus_config.bus.mipi_csi2.num_data_lanes;

        if (num_data_lanes != 1 && num_data_lanes != 2 && num_data_lanes != 4) {
                dev_err(unicam->dev,
                        "Device %s has requested %u data lanes, invalid\n",
                        unicam->sensor.subdev->name, num_data_lanes);
                return -EINVAL;
        }

        if (num_data_lanes > unicam->max_data_lanes) {
                dev_err(unicam->dev,
                        "Device %s has requested %u data lanes, >%u configured in DT\n",
                        unicam->sensor.subdev->name, num_data_lanes,
                        unicam->max_data_lanes);
                return -EINVAL;
        }

        return num_data_lanes;
}

static int unicam_start_streaming(struct vb2_queue *vq, unsigned int count)
{
        struct unicam_node *node = vb2_get_drv_priv(vq);
        struct unicam_device *unicam = node->dev;
        struct unicam_buffer *buf;
        struct media_pipeline_pad_iter iter;
        struct media_pad *pad;
        unsigned long flags;
        int ret;

        dev_dbg(unicam->dev, "Starting stream on %s device\n",
                is_metadata_node(node) ? "metadata" : "image");

        /*
         * Start the pipeline. This validates all links, and populates the
         * pipeline structure.
         */
        ret = video_device_pipeline_start(&node->video_dev, &unicam->pipe.pipe);
        if (ret < 0) {
                dev_dbg(unicam->dev, "Failed to start media pipeline: %d\n", ret);
                goto err_buffers;
        }

        /*
         * Determine which video nodes are included in the pipeline, and get the
         * number of data lanes.
         */
        if (unicam->pipe.pipe.start_count == 1) {
                unicam->pipe.nodes = 0;

                media_pipeline_for_each_pad(&unicam->pipe.pipe, &iter, pad) {
                        if (pad->entity != &unicam->subdev.sd.entity)
                                continue;

                        if (pad->index == UNICAM_SD_PAD_SOURCE_IMAGE)
                                unicam->pipe.nodes |= BIT(UNICAM_IMAGE_NODE);
                        else if (pad->index == UNICAM_SD_PAD_SOURCE_METADATA)
                                unicam->pipe.nodes |= BIT(UNICAM_METADATA_NODE);
                }

                if (!(unicam->pipe.nodes & BIT(UNICAM_IMAGE_NODE))) {
                        dev_dbg(unicam->dev,
                                "Pipeline does not include image node\n");
                        ret = -EPIPE;
                        goto err_pipeline;
                }

                ret = unicam_num_data_lanes(unicam);
                if (ret < 0)
                        goto err_pipeline;

                unicam->pipe.num_data_lanes = ret;

                dev_dbg(unicam->dev, "Running with %u data lanes, nodes %u\n",
                        unicam->pipe.num_data_lanes, unicam->pipe.nodes);
        }

        /* Arm the node with the first buffer from the DMA queue. */
        spin_lock_irqsave(&node->dma_queue_lock, flags);
        buf = list_first_entry(&node->dma_queue, struct unicam_buffer, list);
        node->cur_frm = buf;
        node->next_frm = buf;
        list_del(&buf->list);
        spin_unlock_irqrestore(&node->dma_queue_lock, flags);

        /*
         * Wait for all the video devices in the pipeline to have been started
         * before starting the hardware. In the general case, this would
         * prevent capturing multiple streams independently. However, the
         * Unicam DMA engines are not generic, they have been designed to
         * capture image data and embedded data from the same camera sensor.
         * Not only does the main use case not benefit from independent
         * capture, it requires proper synchronization of the streams at start
         * time.
         */
        if (unicam->pipe.pipe.start_count < hweight32(unicam->pipe.nodes))
                return 0;

        ret = pm_runtime_resume_and_get(unicam->dev);
        if (ret < 0) {
                dev_err(unicam->dev, "PM runtime resume failed: %d\n", ret);
                goto err_pipeline;
        }

        /* Enable the streams on the source. */
        ret = v4l2_subdev_enable_streams(&unicam->subdev.sd,
                                         UNICAM_SD_PAD_SOURCE_IMAGE,
                                         BIT(0));
        if (ret < 0) {
                dev_err(unicam->dev, "stream on failed in subdev\n");
                goto err_pm_put;
        }

        if (unicam->pipe.nodes & BIT(UNICAM_METADATA_NODE)) {
                ret = v4l2_subdev_enable_streams(&unicam->subdev.sd,
                                                 UNICAM_SD_PAD_SOURCE_METADATA,
                                                 BIT(0));
                if (ret < 0) {
                        dev_err(unicam->dev, "stream on failed in subdev\n");
                        goto err_disable_streams;
                }
        }

        return 0;

err_disable_streams:
        v4l2_subdev_disable_streams(&unicam->subdev.sd,
                                    UNICAM_SD_PAD_SOURCE_IMAGE, BIT(0));
err_pm_put:
        pm_runtime_put_sync(unicam->dev);
err_pipeline:
        video_device_pipeline_stop(&node->video_dev);
err_buffers:
        unicam_return_buffers(node, VB2_BUF_STATE_QUEUED);
        return ret;
}

static void unicam_stop_streaming(struct vb2_queue *vq)
{
        struct unicam_node *node = vb2_get_drv_priv(vq);
        struct unicam_device *unicam = node->dev;

        /* Stop the hardware when the first video device gets stopped. */
        if (unicam->pipe.pipe.start_count == hweight32(unicam->pipe.nodes)) {
                if (unicam->pipe.nodes & BIT(UNICAM_METADATA_NODE))
                        v4l2_subdev_disable_streams(&unicam->subdev.sd,
                                                    UNICAM_SD_PAD_SOURCE_METADATA,
                                                    BIT(0));

                v4l2_subdev_disable_streams(&unicam->subdev.sd,
                                            UNICAM_SD_PAD_SOURCE_IMAGE,
                                            BIT(0));

                pm_runtime_put(unicam->dev);
        }

        video_device_pipeline_stop(&node->video_dev);

        /* Clear all queued buffers for the node */
        unicam_return_buffers(node, VB2_BUF_STATE_ERROR);
}

static void unicam_buffer_queue(struct vb2_buffer *vb)
{
        struct unicam_node *node = vb2_get_drv_priv(vb->vb2_queue);
        struct unicam_buffer *buf = to_unicam_buffer(vb);

        spin_lock_irq(&node->dma_queue_lock);
        list_add_tail(&buf->list, &node->dma_queue);
        spin_unlock_irq(&node->dma_queue_lock);
}

static const struct vb2_ops unicam_video_qops = {
        .queue_setup            = unicam_queue_setup,
        .buf_prepare            = unicam_buffer_prepare,
        .start_streaming        = unicam_start_streaming,
        .stop_streaming         = unicam_stop_streaming,
        .buf_queue              = unicam_buffer_queue,
};

/* -----------------------------------------------------------------------------
 *  V4L2 video device operations
 */

static int unicam_querycap(struct file *file, void *priv,
                           struct v4l2_capability *cap)
{
        strscpy(cap->driver, UNICAM_MODULE_NAME, sizeof(cap->driver));
        strscpy(cap->card, UNICAM_MODULE_NAME, sizeof(cap->card));

        cap->capabilities |= V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_META_CAPTURE;

        return 0;
}

static int unicam_enum_fmt_vid(struct file *file, void  *priv,
                               struct v4l2_fmtdesc *f)
{
        unsigned int index;
        unsigned int i;

        for (i = 0, index = 0; i < ARRAY_SIZE(unicam_image_formats); i++) {
                if (f->mbus_code && unicam_image_formats[i].code != f->mbus_code)
                        continue;

                if (index == f->index) {
                        f->pixelformat = unicam_image_formats[i].fourcc;
                        return 0;
                }

                index++;

                if (!unicam_image_formats[i].unpacked_fourcc)
                        continue;

                if (index == f->index) {
                        f->pixelformat = unicam_image_formats[i].unpacked_fourcc;
                        return 0;
                }

                index++;
        }

        return -EINVAL;
}

static int unicam_g_fmt_vid(struct file *file, void *priv,
                            struct v4l2_format *f)
{
        struct unicam_node *node = video_drvdata(file);

        *f = node->fmt;

        return 0;
}

static void __unicam_try_fmt_vid(struct unicam_node *node,
                                 struct v4l2_pix_format *pix)
{
        const struct unicam_format_info *fmtinfo;

        /*
         * Default to the first format if the requested pixel format code isn't
         * supported.
         */
        fmtinfo = unicam_find_format_by_fourcc(pix->pixelformat,
                                               UNICAM_SD_PAD_SOURCE_IMAGE);
        if (!fmtinfo) {
                fmtinfo = &unicam_image_formats[0];
                pix->pixelformat = fmtinfo->fourcc;
        }

        unicam_calc_image_size_bpl(node->dev, fmtinfo, pix);

        if (pix->field == V4L2_FIELD_ANY)
                pix->field = V4L2_FIELD_NONE;
}

static int unicam_try_fmt_vid(struct file *file, void *priv,
                              struct v4l2_format *f)
{
        struct unicam_node *node = video_drvdata(file);

        __unicam_try_fmt_vid(node, &f->fmt.pix);
        return 0;
}

static int unicam_s_fmt_vid(struct file *file, void *priv,
                            struct v4l2_format *f)
{
        struct unicam_node *node = video_drvdata(file);

        if (vb2_is_busy(&node->buffer_queue))
                return -EBUSY;

        __unicam_try_fmt_vid(node, &f->fmt.pix);
        node->fmt = *f;

        return 0;
}

static int unicam_enum_fmt_meta(struct file *file, void *priv,
                                struct v4l2_fmtdesc *f)
{
        unsigned int i, index;

        for (i = 0, index = 0; i < ARRAY_SIZE(unicam_meta_formats); i++) {
                if (f->mbus_code && unicam_meta_formats[i].code != f->mbus_code)
                        continue;

                if (index == f->index) {
                        f->pixelformat = unicam_meta_formats[i].fourcc;
                        f->type = V4L2_BUF_TYPE_META_CAPTURE;
                        f->flags = V4L2_FMT_FLAG_META_LINE_BASED;
                        return 0;
                }

                index++;
        }

        return -EINVAL;
}

static int unicam_g_fmt_meta(struct file *file, void *priv,
                             struct v4l2_format *f)
{
        struct unicam_node *node = video_drvdata(file);

        f->fmt.meta = node->fmt.fmt.meta;

        return 0;
}

static const struct unicam_format_info *
__unicam_try_fmt_meta(struct unicam_node *node, struct v4l2_meta_format *meta)
{
        const struct unicam_format_info *fmtinfo;

        /*
         * Default to the first format if the requested pixel format code isn't
         * supported.
         */
        fmtinfo = unicam_find_format_by_fourcc(meta->dataformat,
                                               UNICAM_SD_PAD_SOURCE_METADATA);
        if (!fmtinfo) {
                fmtinfo = &unicam_meta_formats[0];
                meta->dataformat = fmtinfo->fourcc;
        }

        unicam_calc_meta_size_bpl(node->dev, fmtinfo, meta);

        return fmtinfo;
}

static int unicam_try_fmt_meta(struct file *file, void *priv,
                               struct v4l2_format *f)
{
        struct unicam_node *node = video_drvdata(file);

        __unicam_try_fmt_meta(node, &f->fmt.meta);
        return 0;
}

static int unicam_s_fmt_meta(struct file *file, void *priv,
                             struct v4l2_format *f)
{
        struct unicam_node *node = video_drvdata(file);

        if (vb2_is_busy(&node->buffer_queue))
                return -EBUSY;

        __unicam_try_fmt_meta(node, &f->fmt.meta);
        node->fmt = *f;

        return 0;
}

static int unicam_enum_framesizes(struct file *file, void *fh,
                                  struct v4l2_frmsizeenum *fsize)
{
        struct unicam_node *node = video_drvdata(file);
        int ret = -EINVAL;

        if (fsize->index > 0)
                return ret;

        if (is_image_node(node)) {
                if (!unicam_find_format_by_fourcc(fsize->pixel_format,
                                                  UNICAM_SD_PAD_SOURCE_IMAGE))
                        return ret;

                fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
                fsize->stepwise.min_width = UNICAM_IMAGE_MIN_WIDTH;
                fsize->stepwise.max_width = UNICAM_IMAGE_MAX_WIDTH;
                fsize->stepwise.step_width = 1;
                fsize->stepwise.min_height = UNICAM_IMAGE_MIN_HEIGHT;
                fsize->stepwise.max_height = UNICAM_IMAGE_MAX_HEIGHT;
                fsize->stepwise.step_height = 1;
        } else {
                if (!unicam_find_format_by_fourcc(fsize->pixel_format,
                                                  UNICAM_SD_PAD_SOURCE_METADATA))
                        return ret;

                fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
                fsize->stepwise.min_width = UNICAM_META_MIN_WIDTH;
                fsize->stepwise.max_width = UNICAM_META_MAX_WIDTH;
                fsize->stepwise.step_width = 1;
                fsize->stepwise.min_height = UNICAM_META_MIN_HEIGHT;
                fsize->stepwise.max_height = UNICAM_META_MAX_HEIGHT;
                fsize->stepwise.step_height = 1;
        }

        return 0;
}

static int unicam_log_status(struct file *file, void *fh)
{
        struct unicam_node *node = video_drvdata(file);
        struct unicam_device *unicam = node->dev;
        u32 reg;

        /* status for sub devices */
        v4l2_device_call_all(&unicam->v4l2_dev, 0, core, log_status);

        dev_info(unicam->dev, "-----Receiver status-----\n");
        dev_info(unicam->dev, "V4L2 width/height:   %ux%u\n",
                 node->fmt.fmt.pix.width, node->fmt.fmt.pix.height);
        dev_info(unicam->dev, "V4L2 format:         %08x\n",
                 node->fmt.fmt.pix.pixelformat);
        reg = unicam_reg_read(unicam, UNICAM_IPIPE);
        dev_info(unicam->dev, "Unpacking/packing:   %u / %u\n",
                 unicam_get_field(reg, UNICAM_PUM_MASK),
                 unicam_get_field(reg, UNICAM_PPM_MASK));
        dev_info(unicam->dev, "----Live data----\n");
        dev_info(unicam->dev, "Programmed stride:   %4u\n",
                 unicam_reg_read(unicam, UNICAM_IBLS));
        dev_info(unicam->dev, "Detected resolution: %ux%u\n",
                 unicam_reg_read(unicam, UNICAM_IHSTA),
                 unicam_reg_read(unicam, UNICAM_IVSTA));
        dev_info(unicam->dev, "Write pointer:       %08x\n",
                 unicam_reg_read(unicam, UNICAM_IBWP));

        return 0;
}

static int unicam_subscribe_event(struct v4l2_fh *fh,
                                  const struct v4l2_event_subscription *sub)
{
        switch (sub->type) {
        case V4L2_EVENT_FRAME_SYNC:
                return v4l2_event_subscribe(fh, sub, 2, NULL);
        default:
                return -EINVAL;
        }
}

static const struct v4l2_ioctl_ops unicam_ioctl_ops = {
        .vidioc_querycap                = unicam_querycap,

        .vidioc_enum_fmt_vid_cap        = unicam_enum_fmt_vid,
        .vidioc_g_fmt_vid_cap           = unicam_g_fmt_vid,
        .vidioc_try_fmt_vid_cap         = unicam_try_fmt_vid,
        .vidioc_s_fmt_vid_cap           = unicam_s_fmt_vid,

        .vidioc_enum_fmt_meta_cap       = unicam_enum_fmt_meta,
        .vidioc_g_fmt_meta_cap          = unicam_g_fmt_meta,
        .vidioc_try_fmt_meta_cap        = unicam_try_fmt_meta,
        .vidioc_s_fmt_meta_cap          = unicam_s_fmt_meta,

        .vidioc_enum_framesizes         = unicam_enum_framesizes,

        .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
        .vidioc_create_bufs             = vb2_ioctl_create_bufs,
        .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
        .vidioc_querybuf                = vb2_ioctl_querybuf,
        .vidioc_qbuf                    = vb2_ioctl_qbuf,
        .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
        .vidioc_expbuf                  = vb2_ioctl_expbuf,
        .vidioc_streamon                = vb2_ioctl_streamon,
        .vidioc_streamoff               = vb2_ioctl_streamoff,

        .vidioc_log_status              = unicam_log_status,
        .vidioc_subscribe_event         = unicam_subscribe_event,
        .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
};

/* unicam capture driver file operations */
static const struct v4l2_file_operations unicam_fops = {
        .owner          = THIS_MODULE,
        .open           = v4l2_fh_open,
        .release        = vb2_fop_release,
        .poll           = vb2_fop_poll,
        .unlocked_ioctl = video_ioctl2,
        .mmap           = vb2_fop_mmap,
};

static int unicam_video_link_validate(struct media_link *link)
{
        struct video_device *vdev =
                media_entity_to_video_device(link->sink->entity);
        struct v4l2_subdev *sd =
                media_entity_to_v4l2_subdev(link->source->entity);
        struct unicam_node *node = video_get_drvdata(vdev);
        const u32 pad = is_image_node(node) ? UNICAM_SD_PAD_SOURCE_IMAGE
                      : UNICAM_SD_PAD_SOURCE_METADATA;
        const struct v4l2_mbus_framefmt *format;
        struct v4l2_subdev_state *state;
        int ret = 0;

        state = v4l2_subdev_lock_and_get_active_state(sd);

        format = v4l2_subdev_state_get_format(state, pad, 0);
        if (!format) {
                ret = -EINVAL;
                goto out;
        }

        if (is_image_node(node)) {
                const struct v4l2_pix_format *fmt = &node->fmt.fmt.pix;
                const struct unicam_format_info *fmtinfo;

                fmtinfo = unicam_find_format_by_fourcc(fmt->pixelformat,
                                                       UNICAM_SD_PAD_SOURCE_IMAGE);
                if (WARN_ON(!fmtinfo)) {
                        ret = -EPIPE;
                        goto out;
                }

                if (fmtinfo->code != format->code ||
                    fmt->height != format->height ||
                    fmt->width != format->width ||
                    fmt->field != format->field) {
                        dev_dbg(node->dev->dev,
                                "image: (%u x %u) 0x%08x %s != (%u x %u) 0x%08x %s\n",
                                fmt->width, fmt->height, fmtinfo->code,
                                v4l2_field_names[fmt->field],
                                format->width, format->height, format->code,
                                v4l2_field_names[format->field]);
                        ret = -EPIPE;
                }
        } else {
                const struct v4l2_meta_format *fmt = &node->fmt.fmt.meta;

                const struct unicam_format_info *fmtinfo;

                fmtinfo = unicam_find_format_by_fourcc(fmt->dataformat,
                                                       UNICAM_SD_PAD_SOURCE_METADATA);
                if (WARN_ON(!fmtinfo)) {
                        ret = -EPIPE;
                        goto out;
                }

                if (fmtinfo->code != format->code ||
                    fmt->height != format->height ||
                    fmt->width != format->width) {
                        dev_dbg(node->dev->dev,
                                "meta: (%u x %u) 0x%04x != (%u x %u) 0x%04x\n",
                                fmt->width, fmt->height, fmtinfo->code,
                                format->width, format->height, format->code);
                        ret = -EPIPE;
                }
        }

out:
        v4l2_subdev_unlock_state(state);
        return ret;
}

static const struct media_entity_operations unicam_video_media_ops = {
        .link_validate = unicam_video_link_validate,
};

static void unicam_node_release(struct video_device *vdev)
{
        struct unicam_node *node = video_get_drvdata(vdev);

        unicam_put(node->dev);
}

static void unicam_set_default_format(struct unicam_node *node)
{
        if (is_image_node(node)) {
                struct v4l2_pix_format *fmt = &node->fmt.fmt.pix;
                const struct unicam_format_info *fmtinfo =
                        &unicam_image_formats[0];

                node->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

                v4l2_fill_pix_format(fmt, &unicam_default_image_format);
                fmt->pixelformat = fmtinfo->fourcc;
                unicam_calc_image_size_bpl(node->dev, fmtinfo, fmt);
        } else {
                struct v4l2_meta_format *fmt = &node->fmt.fmt.meta;
                const struct unicam_format_info *fmtinfo =
                        &unicam_meta_formats[0];

                node->fmt.type = V4L2_BUF_TYPE_META_CAPTURE;

                fmt->dataformat = fmtinfo->fourcc;
                fmt->width = unicam_default_meta_format.width;
                fmt->height = unicam_default_meta_format.height;
                unicam_calc_meta_size_bpl(node->dev, fmtinfo, fmt);
        }
}

static int unicam_register_node(struct unicam_device *unicam,
                                enum unicam_node_type type)
{
        const u32 pad_index = type == UNICAM_IMAGE_NODE
                            ? UNICAM_SD_PAD_SOURCE_IMAGE
                            : UNICAM_SD_PAD_SOURCE_METADATA;
        struct unicam_node *node = &unicam->node[type];
        struct video_device *vdev = &node->video_dev;
        struct vb2_queue *q = &node->buffer_queue;
        int ret;

        node->dev = unicam_get(unicam);
        node->id = type;

        spin_lock_init(&node->dma_queue_lock);

        INIT_LIST_HEAD(&node->dma_queue);

        /* Initialize the videobuf2 queue. */
        q->type = type == UNICAM_IMAGE_NODE ? V4L2_BUF_TYPE_VIDEO_CAPTURE
                                            : V4L2_BUF_TYPE_META_CAPTURE;
        q->io_modes = VB2_MMAP | VB2_DMABUF;
        q->drv_priv = node;
        q->ops = &unicam_video_qops;
        q->mem_ops = &vb2_dma_contig_memops;
        q->buf_struct_size = sizeof(struct unicam_buffer);
        q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        q->lock = &unicam->lock;
        q->min_queued_buffers = 1;
        q->dev = unicam->dev;

        ret = vb2_queue_init(q);
        if (ret) {
                dev_err(unicam->dev, "vb2_queue_init() failed\n");
                goto err_unicam_put;
        }

        /* Initialize the video device. */
        vdev->release = unicam_node_release;
        vdev->fops = &unicam_fops;
        vdev->ioctl_ops = &unicam_ioctl_ops;
        vdev->v4l2_dev = &unicam->v4l2_dev;
        vdev->vfl_dir = VFL_DIR_RX;
        vdev->queue = q;
        vdev->lock = &unicam->lock;
        vdev->device_caps = type == UNICAM_IMAGE_NODE
                          ? V4L2_CAP_VIDEO_CAPTURE : V4L2_CAP_META_CAPTURE;
        vdev->device_caps |= V4L2_CAP_STREAMING | V4L2_CAP_IO_MC;
        vdev->entity.ops = &unicam_video_media_ops;

        snprintf(vdev->name, sizeof(vdev->name), "%s-%s", UNICAM_MODULE_NAME,
                 type == UNICAM_IMAGE_NODE ? "image" : "embedded");

        video_set_drvdata(vdev, node);

        if (type == UNICAM_IMAGE_NODE)
                vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT;

        node->pad.flags = MEDIA_PAD_FL_SINK;

        ret = media_entity_pads_init(&vdev->entity, 1, &node->pad);
        if (ret)
                goto err_unicam_put;

        node->dummy_buf.size = UNICAM_DUMMY_BUF_SIZE;
        node->dummy_buf_cpu_addr = dma_alloc_coherent(unicam->dev,
                                                      node->dummy_buf.size,
                                                      &node->dummy_buf.dma_addr,
                                                      GFP_KERNEL);
        if (!node->dummy_buf_cpu_addr) {
                dev_err(unicam->dev, "Unable to allocate dummy buffer.\n");
                ret = -ENOMEM;
                goto err_entity_cleanup;
        }

        unicam_set_default_format(node);

        ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
        if (ret) {
                dev_err(unicam->dev, "Unable to register video device %s\n",
                        vdev->name);
                goto err_dma_free;
        }

        node->registered = true;

        ret = media_create_pad_link(&unicam->subdev.sd.entity,
                                    pad_index,
                                    &node->video_dev.entity,
                                    0,
                                    MEDIA_LNK_FL_ENABLED |
                                    MEDIA_LNK_FL_IMMUTABLE);
        if (ret) {
                /*
                 * No need for cleanup, the caller will unregister the
                 * video device, which will drop the reference on the
                 * device and trigger the cleanup.
                 */
                dev_err(unicam->dev, "Unable to create pad link for %s\n",
                        unicam->sensor.subdev->name);
                return ret;
        }

        return 0;

err_dma_free:
        dma_free_coherent(unicam->dev, node->dummy_buf.size,
                          node->dummy_buf_cpu_addr,
                          node->dummy_buf.dma_addr);
err_entity_cleanup:
        media_entity_cleanup(&vdev->entity);
err_unicam_put:
        unicam_put(unicam);
        return ret;
}

static void unicam_unregister_nodes(struct unicam_device *unicam)
{
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(unicam->node); i++) {
                struct unicam_node *node = &unicam->node[i];

                if (node->registered) {
                        vb2_video_unregister_device(&node->video_dev);
                        node->registered = false;
                }

                if (node->dummy_buf_cpu_addr)
                        dma_free_coherent(unicam->dev, node->dummy_buf.size,
                                          node->dummy_buf_cpu_addr,
                                          node->dummy_buf.dma_addr);
        }
}

/* -----------------------------------------------------------------------------
 * Power management
 */

static int unicam_runtime_resume(struct device *dev)
{
        struct unicam_device *unicam = dev_get_drvdata(dev);
        int ret;

        ret = clk_set_min_rate(unicam->vpu_clock, UNICAM_MIN_VPU_CLOCK_RATE);
        if (ret) {
                dev_err(unicam->dev, "failed to set up VPU clock\n");
                return ret;
        }

        ret = clk_prepare_enable(unicam->vpu_clock);
        if (ret) {
                dev_err(unicam->dev, "Failed to enable VPU clock: %d\n", ret);
                goto err_vpu_clock;
        }

        ret = clk_set_rate(unicam->clock, 100 * 1000 * 1000);
        if (ret) {
                dev_err(unicam->dev, "failed to set up CSI clock\n");
                goto err_vpu_prepare;
        }

        ret = clk_prepare_enable(unicam->clock);
        if (ret) {
                dev_err(unicam->dev, "Failed to enable CSI clock: %d\n", ret);
                goto err_vpu_prepare;
        }

        return 0;

err_vpu_prepare:
        clk_disable_unprepare(unicam->vpu_clock);
err_vpu_clock:
        if (clk_set_min_rate(unicam->vpu_clock, 0))
                dev_err(unicam->dev, "failed to reset the VPU clock\n");

        return ret;
}

static int unicam_runtime_suspend(struct device *dev)
{
        struct unicam_device *unicam = dev_get_drvdata(dev);

        clk_disable_unprepare(unicam->clock);

        if (clk_set_min_rate(unicam->vpu_clock, 0))
                dev_err(unicam->dev, "failed to reset the VPU clock\n");

        clk_disable_unprepare(unicam->vpu_clock);

        return 0;
}

static const struct dev_pm_ops unicam_pm_ops = {
        RUNTIME_PM_OPS(unicam_runtime_suspend, unicam_runtime_resume, NULL)
};

/* -----------------------------------------------------------------------------
 * V4L2 async notifier
 */

static int unicam_async_bound(struct v4l2_async_notifier *notifier,
                              struct v4l2_subdev *subdev,
                              struct v4l2_async_connection *asc)
{
        struct unicam_device *unicam = notifier_to_unicam_device(notifier);
        struct media_pad *sink = &unicam->subdev.pads[UNICAM_SD_PAD_SINK];
        struct media_pad *source;
        int ret;

        dev_dbg(unicam->dev, "Using sensor %s for capture\n",
                subdev->name);

        ret = v4l2_create_fwnode_links_to_pad(subdev, sink, MEDIA_LNK_FL_ENABLED |
                                              MEDIA_LNK_FL_IMMUTABLE);
        if (ret)
                return ret;

        source = media_pad_remote_pad_unique(sink);
        if (IS_ERR(source)) {
                dev_err(unicam->dev, "No connected sensor pad\n");
                return PTR_ERR(source);
        }

        unicam->sensor.subdev = subdev;
        unicam->sensor.pad = source;

        return 0;
}

static int unicam_async_complete(struct v4l2_async_notifier *notifier)
{
        struct unicam_device *unicam = notifier_to_unicam_device(notifier);
        int ret;

        ret = unicam_register_node(unicam, UNICAM_IMAGE_NODE);
        if (ret) {
                dev_err(unicam->dev, "Unable to register image video device.\n");
                goto unregister;
        }

        ret = unicam_register_node(unicam, UNICAM_METADATA_NODE);
        if (ret) {
                dev_err(unicam->dev, "Unable to register metadata video device.\n");
                goto unregister;
        }

        ret = v4l2_device_register_subdev_nodes(&unicam->v4l2_dev);
        if (ret) {
                dev_err(unicam->dev, "Unable to register subdev nodes.\n");
                goto unregister;
        }

        return 0;

unregister:
        unicam_unregister_nodes(unicam);
        unicam_put(unicam);

        return ret;
}

static const struct v4l2_async_notifier_operations unicam_async_ops = {
        .bound = unicam_async_bound,
        .complete = unicam_async_complete,
};

static int unicam_async_nf_init(struct unicam_device *unicam)
{
        struct v4l2_fwnode_endpoint ep = { };
        struct fwnode_handle *ep_handle;
        struct v4l2_async_connection *asc;
        int ret;

        ret = of_property_read_u32(unicam->dev->of_node, "brcm,num-data-lanes",
                                   &unicam->max_data_lanes);
        if (ret < 0) {
                dev_err(unicam->dev, "Missing %s DT property\n",
                        "brcm,num-data-lanes");
                return -EINVAL;
        }

        /* Get and parse the local endpoint. */
        ep_handle = fwnode_graph_get_endpoint_by_id(dev_fwnode(unicam->dev), 0, 0,
                                                    FWNODE_GRAPH_ENDPOINT_NEXT);
        if (!ep_handle) {
                dev_err(unicam->dev, "No endpoint found\n");
                return -ENODEV;
        }

        ret = v4l2_fwnode_endpoint_parse(ep_handle, &ep);
        if (ret) {
                dev_err(unicam->dev, "Failed to parse endpoint: %d\n", ret);
                goto error;
        }

        unicam->bus_type = ep.bus_type;

        switch (ep.bus_type) {
        case V4L2_MBUS_CSI2_DPHY: {
                unsigned int num_data_lanes = ep.bus.mipi_csi2.num_data_lanes;

                if (num_data_lanes != 1 && num_data_lanes != 2 &&
                    num_data_lanes != 4) {
                        dev_err(unicam->dev, "%u data lanes not supported\n",
                                num_data_lanes);
                        ret = -EINVAL;
                        goto error;
                }

                if (num_data_lanes > unicam->max_data_lanes) {
                        dev_err(unicam->dev,
                                "Endpoint uses %u data lanes when %u are supported\n",
                                num_data_lanes, unicam->max_data_lanes);
                        ret = -EINVAL;
                        goto error;
                }

                unicam->max_data_lanes = num_data_lanes;
                unicam->bus_flags = ep.bus.mipi_csi2.flags;
                break;
        }

        case V4L2_MBUS_CCP2:
                unicam->max_data_lanes = 1;
                unicam->bus_flags = ep.bus.mipi_csi1.strobe;
                break;

        default:
                /* Unsupported bus type */
                dev_err(unicam->dev, "Unsupported bus type %u\n", ep.bus_type);
                ret = -EINVAL;
                goto error;
        }

        /* Initialize and register the async notifier. */
        v4l2_async_nf_init(&unicam->notifier, &unicam->v4l2_dev);

        asc = v4l2_async_nf_add_fwnode_remote(&unicam->notifier, ep_handle,
                                              struct v4l2_async_connection);
        fwnode_handle_put(ep_handle);
        ep_handle = NULL;

        if (IS_ERR(asc)) {
                ret = PTR_ERR(asc);
                dev_err(unicam->dev, "Failed to add entry to notifier: %d\n",
                        ret);
                goto error;
        }

        unicam->notifier.ops = &unicam_async_ops;

        ret = v4l2_async_nf_register(&unicam->notifier);
        if (ret) {
                dev_err(unicam->dev, "Error registering device notifier: %d\n",
                        ret);
                goto error;
        }

        return 0;

error:
        fwnode_handle_put(ep_handle);
        return ret;
}

/* -----------------------------------------------------------------------------
 * Probe & remove
 */

static int unicam_media_init(struct unicam_device *unicam)
{
        int ret;

        unicam->mdev.dev = unicam->dev;
        strscpy(unicam->mdev.model, UNICAM_MODULE_NAME,
                sizeof(unicam->mdev.model));
        unicam->mdev.hw_revision = 0;

        media_device_init(&unicam->mdev);

        unicam->v4l2_dev.mdev = &unicam->mdev;

        ret = v4l2_device_register(unicam->dev, &unicam->v4l2_dev);
        if (ret < 0) {
                dev_err(unicam->dev, "Unable to register v4l2 device\n");
                goto err_media_cleanup;
        }

        ret = media_device_register(&unicam->mdev);
        if (ret < 0) {
                dev_err(unicam->dev,
                        "Unable to register media-controller device\n");
                goto err_v4l2_unregister;
        }

        return 0;

err_v4l2_unregister:
        v4l2_device_unregister(&unicam->v4l2_dev);
err_media_cleanup:
        media_device_cleanup(&unicam->mdev);
        return ret;
}

static int unicam_probe(struct platform_device *pdev)
{
        struct unicam_device *unicam;
        int ret;

        unicam = kzalloc_obj(*unicam);
        if (!unicam)
                return -ENOMEM;

        kref_init(&unicam->kref);
        mutex_init(&unicam->lock);

        unicam->dev = &pdev->dev;
        platform_set_drvdata(pdev, unicam);

        unicam->base = devm_platform_ioremap_resource_byname(pdev, "unicam");
        if (IS_ERR(unicam->base)) {
                ret = PTR_ERR(unicam->base);
                goto err_unicam_put;
        }

        unicam->clk_gate_base = devm_platform_ioremap_resource_byname(pdev, "cmi");
        if (IS_ERR(unicam->clk_gate_base)) {
                ret = PTR_ERR(unicam->clk_gate_base);
                goto err_unicam_put;
        }

        unicam->clock = devm_clk_get(&pdev->dev, "lp");
        if (IS_ERR(unicam->clock)) {
                dev_err(unicam->dev, "Failed to get lp clock\n");
                ret = PTR_ERR(unicam->clock);
                goto err_unicam_put;
        }

        unicam->vpu_clock = devm_clk_get(&pdev->dev, "vpu");
        if (IS_ERR(unicam->vpu_clock)) {
                dev_err(unicam->dev, "Failed to get vpu clock\n");
                ret = PTR_ERR(unicam->vpu_clock);
                goto err_unicam_put;
        }

        ret = platform_get_irq(pdev, 0);
        if (ret < 0)
                goto err_unicam_put;

        ret = devm_request_irq(&pdev->dev, ret, unicam_isr, 0,
                               "unicam_capture0", unicam);
        if (ret) {
                dev_err(&pdev->dev, "Unable to request interrupt\n");
                goto err_unicam_put;
        }

        /* Enable the block power domain. */
        pm_runtime_enable(&pdev->dev);

        ret = unicam_media_init(unicam);
        if (ret)
                goto err_pm_runtime;

        ret = unicam_subdev_init(unicam);
        if (ret)
                goto err_media_unregister;

        ret = unicam_async_nf_init(unicam);
        if (ret)
                goto err_subdev_unregister;

        return 0;

err_subdev_unregister:
        unicam_subdev_cleanup(unicam);
err_media_unregister:
        media_device_unregister(&unicam->mdev);
err_pm_runtime:
        pm_runtime_disable(&pdev->dev);
err_unicam_put:
        unicam_put(unicam);

        return ret;
}

static void unicam_remove(struct platform_device *pdev)
{
        struct unicam_device *unicam = platform_get_drvdata(pdev);

        unicam_unregister_nodes(unicam);
        v4l2_device_unregister(&unicam->v4l2_dev);
        media_device_unregister(&unicam->mdev);
        v4l2_async_nf_unregister(&unicam->notifier);

        unicam_subdev_cleanup(unicam);

        unicam_put(unicam);

        pm_runtime_disable(&pdev->dev);
}

static const struct of_device_id unicam_of_match[] = {
        { .compatible = "brcm,bcm2835-unicam", },
        { /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, unicam_of_match);

static struct platform_driver unicam_driver = {
        .probe          = unicam_probe,
        .remove         = unicam_remove,
        .driver = {
                .name   = UNICAM_MODULE_NAME,
                .pm     = pm_ptr(&unicam_pm_ops),
                .of_match_table = unicam_of_match,
        },
};

module_platform_driver(unicam_driver);

MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.com>");
MODULE_DESCRIPTION("BCM2835 Unicam driver");
MODULE_LICENSE("GPL");