// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Driver for the Conexant CX23885 PCIe bridge
 *
 *  Copyright (c) 2007 Steven Toth <stoth@linuxtv.org>
 */

#include "cx23885.h"
#include "cx23885-video.h"

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kmod.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <asm/div64.h>

#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
#include "cx23885-ioctl.h"
#include "tuner-xc2028.h"

#include <media/drv-intf/cx25840.h>

MODULE_DESCRIPTION("v4l2 driver module for cx23885 based TV cards");
MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
MODULE_LICENSE("GPL");

/* ------------------------------------------------------------------ */

static unsigned int video_nr[] = {[0 ... (CX23885_MAXBOARDS - 1)] = UNSET };
static unsigned int vbi_nr[]   = {[0 ... (CX23885_MAXBOARDS - 1)] = UNSET };

module_param_array(video_nr, int, NULL, 0444);
module_param_array(vbi_nr,   int, NULL, 0444);

MODULE_PARM_DESC(video_nr, "video device numbers");
MODULE_PARM_DESC(vbi_nr, "vbi device numbers");

static unsigned int video_debug;
module_param(video_debug, int, 0644);
MODULE_PARM_DESC(video_debug, "enable debug messages [video]");

static unsigned int irq_debug;
module_param(irq_debug, int, 0644);
MODULE_PARM_DESC(irq_debug, "enable debug messages [IRQ handler]");

static unsigned int vid_limit = 16;
module_param(vid_limit, int, 0644);
MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");

#define dprintk(level, fmt, arg...)\
        do { if (video_debug >= level)\
                printk(KERN_DEBUG pr_fmt("%s: video:" fmt), \
                        __func__, ##arg); \
        } while (0)

/* ------------------------------------------------------------------- */
/* static data                                                         */

#define FORMAT_FLAGS_PACKED       0x01
static struct cx23885_fmt formats[] = {
        {
                .fourcc   = V4L2_PIX_FMT_YUYV,
                .depth    = 16,
                .flags    = FORMAT_FLAGS_PACKED,
        }
};

static struct cx23885_fmt *format_by_fourcc(unsigned int fourcc)
{
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(formats); i++)
                if (formats[i].fourcc == fourcc)
                        return formats+i;
        return NULL;
}

/* ------------------------------------------------------------------- */

void cx23885_video_wakeup(struct cx23885_dev *dev,
        struct cx23885_dmaqueue *q, u32 count)
{
        struct cx23885_buffer *buf;

        if (list_empty(&q->active))
                return;
        buf = list_entry(q->active.next,
                        struct cx23885_buffer, queue);

        buf->vb.sequence = q->count++;
        buf->vb.vb2_buf.timestamp = ktime_get_ns();
        dprintk(2, "[%p/%d] wakeup reg=%d buf=%d\n", buf,
                        buf->vb.vb2_buf.index, count, q->count);
        list_del(&buf->queue);
        vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
}

int cx23885_set_tvnorm(struct cx23885_dev *dev, v4l2_std_id norm)
{
        struct v4l2_subdev_format format = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
                .format.code = MEDIA_BUS_FMT_FIXED,
        };

        dprintk(1, "%s(norm = 0x%08x) name: [%s]\n",
                __func__,
                (unsigned int)norm,
                v4l2_norm_to_name(norm));

        if (dev->tvnorm == norm)
                return 0;

        if (dev->tvnorm != norm) {
                if (vb2_is_busy(&dev->vb2_vidq) || vb2_is_busy(&dev->vb2_vbiq) ||
                    vb2_is_busy(&dev->vb2_mpegq))
                        return -EBUSY;
        }

        dev->tvnorm = norm;
        dev->width = 720;
        dev->height = norm_maxh(norm);
        dev->field = V4L2_FIELD_INTERLACED;

        call_all(dev, video, s_std, norm);

        format.format.width = dev->width;
        format.format.height = dev->height;
        format.format.field = dev->field;
        call_all(dev, pad, set_fmt, NULL, &format);

        return 0;
}

static struct video_device *cx23885_vdev_init(struct cx23885_dev *dev,
                                    struct pci_dev *pci,
                                    struct video_device *template,
                                    char *type)
{
        struct video_device *vfd;
        dprintk(1, "%s()\n", __func__);

        vfd = video_device_alloc();
        if (NULL == vfd)
                return NULL;
        *vfd = *template;
        vfd->v4l2_dev = &dev->v4l2_dev;
        vfd->release = video_device_release;
        vfd->lock = &dev->lock;
        snprintf(vfd->name, sizeof(vfd->name), "%s (%s)",
                 cx23885_boards[dev->board].name, type);
        video_set_drvdata(vfd, dev);
        return vfd;
}

int cx23885_flatiron_write(struct cx23885_dev *dev, u8 reg, u8 data)
{
        /* 8 bit registers, 8 bit values */
        u8 buf[] = { reg, data };

        struct i2c_msg msg = { .addr = 0x98 >> 1,
                .flags = 0, .buf = buf, .len = 2 };

        return i2c_transfer(&dev->i2c_bus[2].i2c_adap, &msg, 1);
}

u8 cx23885_flatiron_read(struct cx23885_dev *dev, u8 reg)
{
        /* 8 bit registers, 8 bit values */
        int ret;
        u8 b0[] = { reg };
        u8 b1[] = { 0 };

        struct i2c_msg msg[] = {
                { .addr = 0x98 >> 1, .flags = 0, .buf = b0, .len = 1 },
                { .addr = 0x98 >> 1, .flags = I2C_M_RD, .buf = b1, .len = 1 }
        };

        ret = i2c_transfer(&dev->i2c_bus[2].i2c_adap, &msg[0], 2);
        if (ret != 2)
                pr_err("%s() error\n", __func__);

        return b1[0];
}

static void cx23885_flatiron_dump(struct cx23885_dev *dev)
{
        int i;
        dprintk(1, "Flatiron dump\n");
        for (i = 0; i < 0x24; i++) {
                dprintk(1, "FI[%02x] = %02x\n", i,
                        cx23885_flatiron_read(dev, i));
        }
}

static int cx23885_flatiron_mux(struct cx23885_dev *dev, int input)
{
        u8 val;
        dprintk(1, "%s(input = %d)\n", __func__, input);

        if (input == 1)
                val = cx23885_flatiron_read(dev, CH_PWR_CTRL1) & ~FLD_CH_SEL;
        else if (input == 2)
                val = cx23885_flatiron_read(dev, CH_PWR_CTRL1) | FLD_CH_SEL;
        else
                return -EINVAL;

        val |= 0x20; /* Enable clock to delta-sigma and dec filter */

        cx23885_flatiron_write(dev, CH_PWR_CTRL1, val);

        /* Wake up */
        cx23885_flatiron_write(dev, CH_PWR_CTRL2, 0);

        if (video_debug)
                cx23885_flatiron_dump(dev);

        return 0;
}

static int cx23885_video_mux(struct cx23885_dev *dev, unsigned int input)
{
        dprintk(1, "%s() video_mux: %d [vmux=%d, gpio=0x%x,0x%x,0x%x,0x%x]\n",
                __func__,
                input, INPUT(input)->vmux,
                INPUT(input)->gpio0, INPUT(input)->gpio1,
                INPUT(input)->gpio2, INPUT(input)->gpio3);
        dev->input = input;

        if (dev->board == CX23885_BOARD_MYGICA_X8506 ||
                dev->board == CX23885_BOARD_MAGICPRO_PROHDTVE2 ||
                dev->board == CX23885_BOARD_MYGICA_X8507) {
                /* Select Analog TV */
                if (INPUT(input)->type == CX23885_VMUX_TELEVISION)
                        cx23885_gpio_clear(dev, GPIO_0);
        }

        /* Tell the internal A/V decoder */
        v4l2_subdev_call(dev->sd_cx25840, video, s_routing,
                        INPUT(input)->vmux, 0, 0);

        if ((dev->board == CX23885_BOARD_HAUPPAUGE_HVR1800) ||
                (dev->board == CX23885_BOARD_MPX885) ||
                (dev->board == CX23885_BOARD_HAUPPAUGE_HVR1250) ||
                (dev->board == CX23885_BOARD_HAUPPAUGE_IMPACTVCBE) ||
                (dev->board == CX23885_BOARD_HAUPPAUGE_HVR1255) ||
                (dev->board == CX23885_BOARD_HAUPPAUGE_HVR1255_22111) ||
                (dev->board == CX23885_BOARD_HAUPPAUGE_HVR1265_K4) ||
                (dev->board == CX23885_BOARD_HAUPPAUGE_HVR1850) ||
                (dev->board == CX23885_BOARD_MYGICA_X8507) ||
                (dev->board == CX23885_BOARD_AVERMEDIA_HC81R) ||
                (dev->board == CX23885_BOARD_VIEWCAST_260E) ||
                (dev->board == CX23885_BOARD_VIEWCAST_460E)) {
                /* Configure audio routing */
                v4l2_subdev_call(dev->sd_cx25840, audio, s_routing,
                        INPUT(input)->amux, 0, 0);

                if (INPUT(input)->amux == CX25840_AUDIO7)
                        cx23885_flatiron_mux(dev, 1);
                else if (INPUT(input)->amux == CX25840_AUDIO6)
                        cx23885_flatiron_mux(dev, 2);
        }

        return 0;
}

static int cx23885_audio_mux(struct cx23885_dev *dev, unsigned int input)
{
        dprintk(1, "%s(input=%d)\n", __func__, input);

        /* The baseband video core of the cx23885 has two audio inputs.
         * LR1 and LR2. In almost every single case so far only HVR1xxx
         * cards we've only ever supported LR1. Time to support LR2,
         * which is available via the optional white breakout header on
         * the board.
         * We'll use a could of existing enums in the card struct to allow
         * devs to specify which baseband input they need, or just default
         * to what we've always used.
         */
        if (INPUT(input)->amux == CX25840_AUDIO7)
                cx23885_flatiron_mux(dev, 1);
        else if (INPUT(input)->amux == CX25840_AUDIO6)
                cx23885_flatiron_mux(dev, 2);
        else {
                /* Not specifically defined, assume the default. */
                cx23885_flatiron_mux(dev, 1);
        }

        return 0;
}

/* ------------------------------------------------------------------ */
static int cx23885_start_video_dma(struct cx23885_dev *dev,
                           struct cx23885_dmaqueue *q,
                           struct cx23885_buffer *buf)
{
        dprintk(1, "%s()\n", __func__);

        /* Stop the dma/fifo before we tamper with it's risc programs */
        cx_clear(VID_A_DMA_CTL, 0x11);

        /* setup fifo + format */
        cx23885_sram_channel_setup(dev, &dev->sram_channels[SRAM_CH01],
                                buf->bpl, buf->risc.dma);

        /* reset counter */
        cx_write(VID_A_GPCNT_CTL, 3);
        q->count = 0;

        /* enable irq */
        cx23885_irq_add_enable(dev, 0x01);
        cx_set(VID_A_INT_MSK, 0x000011);

        /* start dma */
        cx_set(DEV_CNTRL2, (1<<5));
        cx_set(VID_A_DMA_CTL, 0x11); /* FIFO and RISC enable */

        return 0;
}

static int queue_setup(struct vb2_queue *q,
                           unsigned int *num_buffers, unsigned int *num_planes,
                           unsigned int sizes[], struct device *alloc_devs[])
{
        struct cx23885_dev *dev = q->drv_priv;

        *num_planes = 1;
        sizes[0] = (dev->fmt->depth * dev->width * dev->height) >> 3;
        return 0;
}

static int buffer_prepare(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct cx23885_dev *dev = vb->vb2_queue->drv_priv;
        struct cx23885_buffer *buf =
                container_of(vbuf, struct cx23885_buffer, vb);
        u32 line0_offset, line1_offset;
        struct sg_table *sgt = vb2_dma_sg_plane_desc(vb, 0);
        int field_tff;

        buf->bpl = (dev->width * dev->fmt->depth) >> 3;

        if (vb2_plane_size(vb, 0) < dev->height * buf->bpl)
                return -EINVAL;
        vb2_set_plane_payload(vb, 0, dev->height * buf->bpl);

        switch (dev->field) {
        case V4L2_FIELD_TOP:
                cx23885_risc_buffer(dev->pci, &buf->risc,
                                sgt->sgl, 0, UNSET,
                                buf->bpl, 0, dev->height);
                break;
        case V4L2_FIELD_BOTTOM:
                cx23885_risc_buffer(dev->pci, &buf->risc,
                                sgt->sgl, UNSET, 0,
                                buf->bpl, 0, dev->height);
                break;
        case V4L2_FIELD_INTERLACED:
                if (dev->tvnorm & V4L2_STD_525_60)
                        /* NTSC or  */
                        field_tff = 1;
                else
                        field_tff = 0;

                if (cx23885_boards[dev->board].force_bff)
                        /* PAL / SECAM OR 888 in NTSC MODE */
                        field_tff = 0;

                if (field_tff) {
                        /* cx25840 transmits NTSC bottom field first */
                        dprintk(1, "%s() Creating TFF/NTSC risc\n",
                                        __func__);
                        line0_offset = buf->bpl;
                        line1_offset = 0;
                } else {
                        /* All other formats are top field first */
                        dprintk(1, "%s() Creating BFF/PAL/SECAM risc\n",
                                        __func__);
                        line0_offset = 0;
                        line1_offset = buf->bpl;
                }
                cx23885_risc_buffer(dev->pci, &buf->risc,
                                sgt->sgl, line0_offset,
                                line1_offset,
                                buf->bpl, buf->bpl,
                                dev->height >> 1);
                break;
        case V4L2_FIELD_SEQ_TB:
                cx23885_risc_buffer(dev->pci, &buf->risc,
                                sgt->sgl,
                                0, buf->bpl * (dev->height >> 1),
                                buf->bpl, 0,
                                dev->height >> 1);
                break;
        case V4L2_FIELD_SEQ_BT:
                cx23885_risc_buffer(dev->pci, &buf->risc,
                                sgt->sgl,
                                buf->bpl * (dev->height >> 1), 0,
                                buf->bpl, 0,
                                dev->height >> 1);
                break;
        default:
                BUG();
        }
        dprintk(2, "[%p/%d] buffer_init - %dx%d %dbpp 0x%08x - dma=0x%08lx\n",
                buf, buf->vb.vb2_buf.index,
                dev->width, dev->height, dev->fmt->depth, dev->fmt->fourcc,
                (unsigned long)buf->risc.dma);
        return 0;
}

static void buffer_finish(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct cx23885_buffer *buf = container_of(vbuf,
                struct cx23885_buffer, vb);

        cx23885_free_buffer(vb->vb2_queue->drv_priv, buf);
}

/*
 * The risc program for each buffer works as follows: it starts with a simple
 * 'JUMP to addr + 12', which is effectively a NOP. Then the code to DMA the
 * buffer follows and at the end we have a JUMP back to the start + 12 (skipping
 * the initial JUMP).
 *
 * This is the risc program of the first buffer to be queued if the active list
 * is empty and it just keeps DMAing this buffer without generating any
 * interrupts.
 *
 * If a new buffer is added then the initial JUMP in the code for that buffer
 * will generate an interrupt which signals that the previous buffer has been
 * DMAed successfully and that it can be returned to userspace.
 *
 * It also sets the final jump of the previous buffer to the start of the new
 * buffer, thus chaining the new buffer into the DMA chain. This is a single
 * atomic u32 write, so there is no race condition.
 *
 * The end-result of all this that you only get an interrupt when a buffer
 * is ready, so the control flow is very easy.
 */
static void buffer_queue(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct cx23885_dev *dev = vb->vb2_queue->drv_priv;
        struct cx23885_buffer   *buf = container_of(vbuf,
                struct cx23885_buffer, vb);
        struct cx23885_buffer   *prev;
        struct cx23885_dmaqueue *q    = &dev->vidq;
        unsigned long flags;

        /* add jump to start */
        buf->risc.cpu[1] = cpu_to_le32(buf->risc.dma + 12);
        buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_CNT_INC);
        buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma + 12);
        buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */

        spin_lock_irqsave(&dev->slock, flags);
        if (list_empty(&q->active)) {
                list_add_tail(&buf->queue, &q->active);
                dprintk(2, "[%p/%d] buffer_queue - first active\n",
                        buf, buf->vb.vb2_buf.index);
        } else {
                buf->risc.cpu[0] |= cpu_to_le32(RISC_IRQ1);
                prev = list_entry(q->active.prev, struct cx23885_buffer,
                        queue);
                list_add_tail(&buf->queue, &q->active);
                prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
                dprintk(2, "[%p/%d] buffer_queue - append to active\n",
                                buf, buf->vb.vb2_buf.index);
        }
        spin_unlock_irqrestore(&dev->slock, flags);
}

static int cx23885_start_streaming(struct vb2_queue *q, unsigned int count)
{
        struct cx23885_dev *dev = q->drv_priv;
        struct cx23885_dmaqueue *dmaq = &dev->vidq;
        struct cx23885_buffer *buf = list_entry(dmaq->active.next,
                        struct cx23885_buffer, queue);

        cx23885_start_video_dma(dev, dmaq, buf);
        return 0;
}

static void cx23885_stop_streaming(struct vb2_queue *q)
{
        struct cx23885_dev *dev = q->drv_priv;
        struct cx23885_dmaqueue *dmaq = &dev->vidq;
        unsigned long flags;

        cx_clear(VID_A_DMA_CTL, 0x11);
        spin_lock_irqsave(&dev->slock, flags);
        while (!list_empty(&dmaq->active)) {
                struct cx23885_buffer *buf = list_entry(dmaq->active.next,
                        struct cx23885_buffer, queue);

                list_del(&buf->queue);
                vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
        }
        spin_unlock_irqrestore(&dev->slock, flags);
}

static const struct vb2_ops cx23885_video_qops = {
        .queue_setup    = queue_setup,
        .buf_prepare  = buffer_prepare,
        .buf_finish = buffer_finish,
        .buf_queue    = buffer_queue,
        .wait_prepare = vb2_ops_wait_prepare,
        .wait_finish = vb2_ops_wait_finish,
        .start_streaming = cx23885_start_streaming,
        .stop_streaming = cx23885_stop_streaming,
};

/* ------------------------------------------------------------------ */
/* VIDEO IOCTLS                                                       */

static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
        struct v4l2_format *f)
{
        struct cx23885_dev *dev = video_drvdata(file);

        f->fmt.pix.width        = dev->width;
        f->fmt.pix.height       = dev->height;
        f->fmt.pix.field        = dev->field;
        f->fmt.pix.pixelformat  = dev->fmt->fourcc;
        f->fmt.pix.bytesperline =
                (f->fmt.pix.width * dev->fmt->depth) >> 3;
        f->fmt.pix.sizeimage =
                f->fmt.pix.height * f->fmt.pix.bytesperline;
        f->fmt.pix.colorspace   = V4L2_COLORSPACE_SMPTE170M;

        return 0;
}

static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
        struct v4l2_format *f)
{
        struct cx23885_dev *dev = video_drvdata(file);
        struct cx23885_fmt *fmt;
        enum v4l2_field   field;
        unsigned int      maxw, maxh;

        fmt = format_by_fourcc(f->fmt.pix.pixelformat);
        if (NULL == fmt)
                return -EINVAL;

        field = f->fmt.pix.field;
        maxw  = 720;
        maxh  = norm_maxh(dev->tvnorm);

        if (V4L2_FIELD_ANY == field) {
                field = (f->fmt.pix.height > maxh/2)
                        ? V4L2_FIELD_INTERLACED
                        : V4L2_FIELD_BOTTOM;
        }

        switch (field) {
        case V4L2_FIELD_TOP:
        case V4L2_FIELD_BOTTOM:
                maxh = maxh / 2;
                break;
        case V4L2_FIELD_INTERLACED:
        case V4L2_FIELD_SEQ_TB:
        case V4L2_FIELD_SEQ_BT:
                break;
        default:
                field = V4L2_FIELD_INTERLACED;
                break;
        }

        f->fmt.pix.field = field;
        v4l_bound_align_image(&f->fmt.pix.width, 48, maxw, 2,
                              &f->fmt.pix.height, 32, maxh, 0, 0);
        f->fmt.pix.bytesperline =
                (f->fmt.pix.width * fmt->depth) >> 3;
        f->fmt.pix.sizeimage =
                f->fmt.pix.height * f->fmt.pix.bytesperline;
        f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;

        return 0;
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
        struct v4l2_format *f)
{
        struct cx23885_dev *dev = video_drvdata(file);
        struct v4l2_subdev_format format = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
        };
        int err;

        dprintk(2, "%s()\n", __func__);
        err = vidioc_try_fmt_vid_cap(file, priv, f);

        if (0 != err)
                return err;

        if (vb2_is_busy(&dev->vb2_vidq) || vb2_is_busy(&dev->vb2_vbiq) ||
            vb2_is_busy(&dev->vb2_mpegq))
                return -EBUSY;

        dev->fmt        = format_by_fourcc(f->fmt.pix.pixelformat);
        dev->width      = f->fmt.pix.width;
        dev->height     = f->fmt.pix.height;
        dev->field      = f->fmt.pix.field;
        dprintk(2, "%s() width=%d height=%d field=%d\n", __func__,
                dev->width, dev->height, dev->field);
        v4l2_fill_mbus_format(&format.format, &f->fmt.pix, MEDIA_BUS_FMT_FIXED);
        call_all(dev, pad, set_fmt, NULL, &format);
        v4l2_fill_pix_format(&f->fmt.pix, &format.format);
        /* set_fmt overwrites f->fmt.pix.field, restore it */
        f->fmt.pix.field = dev->field;
        return 0;
}

static int vidioc_querycap(struct file *file, void  *priv,
        struct v4l2_capability *cap)
{
        struct cx23885_dev *dev = video_drvdata(file);

        strscpy(cap->driver, "cx23885", sizeof(cap->driver));
        strscpy(cap->card, cx23885_boards[dev->board].name,
                sizeof(cap->card));
        sprintf(cap->bus_info, "PCIe:%s", pci_name(dev->pci));
        cap->capabilities = V4L2_CAP_READWRITE | V4L2_CAP_STREAMING |
                            V4L2_CAP_AUDIO | V4L2_CAP_VBI_CAPTURE |
                            V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VBI_CAPTURE |
                            V4L2_CAP_DEVICE_CAPS;
        if (dev->tuner_type != TUNER_ABSENT)
                cap->capabilities |= V4L2_CAP_TUNER;
        return 0;
}

static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
        struct v4l2_fmtdesc *f)
{
        if (unlikely(f->index >= ARRAY_SIZE(formats)))
                return -EINVAL;

        f->pixelformat = formats[f->index].fourcc;

        return 0;
}

static int vidioc_g_pixelaspect(struct file *file, void *priv,
                                int type, struct v4l2_fract *f)
{
        struct cx23885_dev *dev = video_drvdata(file);
        bool is_50hz = dev->tvnorm & V4L2_STD_625_50;

        if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                return -EINVAL;

        f->numerator = is_50hz ? 54 : 11;
        f->denominator = is_50hz ? 59 : 10;

        return 0;
}

static int vidioc_g_selection(struct file *file, void *fh,
                              struct v4l2_selection *sel)
{
        struct cx23885_dev *dev = video_drvdata(file);

        if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                return -EINVAL;

        switch (sel->target) {
        case V4L2_SEL_TGT_CROP_BOUNDS:
        case V4L2_SEL_TGT_CROP_DEFAULT:
                sel->r.top = 0;
                sel->r.left = 0;
                sel->r.width = 720;
                sel->r.height = norm_maxh(dev->tvnorm);
                break;
        default:
                return -EINVAL;
        }
        return 0;
}

static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *id)
{
        struct cx23885_dev *dev = video_drvdata(file);
        dprintk(1, "%s()\n", __func__);

        *id = dev->tvnorm;
        return 0;
}

static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id tvnorms)
{
        struct cx23885_dev *dev = video_drvdata(file);
        dprintk(1, "%s()\n", __func__);

        return cx23885_set_tvnorm(dev, tvnorms);
}

int cx23885_enum_input(struct cx23885_dev *dev, struct v4l2_input *i)
{
        static const char *iname[] = {
                [CX23885_VMUX_COMPOSITE1] = "Composite1",
                [CX23885_VMUX_COMPOSITE2] = "Composite2",
                [CX23885_VMUX_COMPOSITE3] = "Composite3",
                [CX23885_VMUX_COMPOSITE4] = "Composite4",
                [CX23885_VMUX_SVIDEO]     = "S-Video",
                [CX23885_VMUX_COMPONENT]  = "Component",
                [CX23885_VMUX_TELEVISION] = "Television",
                [CX23885_VMUX_CABLE]      = "Cable TV",
                [CX23885_VMUX_DVB]        = "DVB",
                [CX23885_VMUX_DEBUG]      = "for debug only",
        };
        unsigned int n;
        dprintk(1, "%s()\n", __func__);

        n = i->index;
        if (n >= MAX_CX23885_INPUT)
                return -EINVAL;

        if (0 == INPUT(n)->type)
                return -EINVAL;

        i->index = n;
        i->type  = V4L2_INPUT_TYPE_CAMERA;
        strscpy(i->name, iname[INPUT(n)->type], sizeof(i->name));
        i->std = CX23885_NORMS;
        if ((CX23885_VMUX_TELEVISION == INPUT(n)->type) ||
                (CX23885_VMUX_CABLE == INPUT(n)->type)) {
                i->type = V4L2_INPUT_TYPE_TUNER;
                i->audioset = 4;
        } else {
                /* Two selectable audio inputs for non-tv inputs */
                i->audioset = 3;
        }

        if (dev->input == n) {
                /* enum'd input matches our configured input.
                 * Ask the video decoder to process the call
                 * and give it an oppertunity to update the
                 * status field.
                 */
                call_all(dev, video, g_input_status, &i->status);
        }

        return 0;
}

static int vidioc_enum_input(struct file *file, void *priv,
                                struct v4l2_input *i)
{
        struct cx23885_dev *dev = video_drvdata(file);
        dprintk(1, "%s()\n", __func__);
        return cx23885_enum_input(dev, i);
}

int cx23885_get_input(struct file *file, void *priv, unsigned int *i)
{
        struct cx23885_dev *dev = video_drvdata(file);

        *i = dev->input;
        dprintk(1, "%s() returns %d\n", __func__, *i);
        return 0;
}

static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
        return cx23885_get_input(file, priv, i);
}

int cx23885_set_input(struct file *file, void *priv, unsigned int i)
{
        struct cx23885_dev *dev = video_drvdata(file);

        dprintk(1, "%s(%d)\n", __func__, i);

        if (i >= MAX_CX23885_INPUT) {
                dprintk(1, "%s() -EINVAL\n", __func__);
                return -EINVAL;
        }

        if (INPUT(i)->type == 0)
                return -EINVAL;

        cx23885_video_mux(dev, i);

        /* By default establish the default audio input for the card also */
        /* Caller is free to use VIDIOC_S_AUDIO to override afterwards */
        cx23885_audio_mux(dev, i);
        return 0;
}

static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
        return cx23885_set_input(file, priv, i);
}

static int vidioc_log_status(struct file *file, void *priv)
{
        struct cx23885_dev *dev = video_drvdata(file);

        call_all(dev, core, log_status);
        return 0;
}

static int cx23885_query_audinput(struct file *file, void *priv,
        struct v4l2_audio *i)
{
        static const char *iname[] = {
                [0] = "Baseband L/R 1",
                [1] = "Baseband L/R 2",
                [2] = "TV",
        };
        unsigned int n;
        dprintk(1, "%s()\n", __func__);

        n = i->index;
        if (n >= 3)
                return -EINVAL;

        memset(i, 0, sizeof(*i));
        i->index = n;
        strscpy(i->name, iname[n], sizeof(i->name));
        i->capability = V4L2_AUDCAP_STEREO;
        return 0;

}

static int vidioc_enum_audinput(struct file *file, void *priv,
                                struct v4l2_audio *i)
{
        return cx23885_query_audinput(file, priv, i);
}

static int vidioc_g_audinput(struct file *file, void *priv,
        struct v4l2_audio *i)
{
        struct cx23885_dev *dev = video_drvdata(file);

        if ((CX23885_VMUX_TELEVISION == INPUT(dev->input)->type) ||
                (CX23885_VMUX_CABLE == INPUT(dev->input)->type))
                i->index = 2;
        else
                i->index = dev->audinput;
        dprintk(1, "%s(input=%d)\n", __func__, i->index);

        return cx23885_query_audinput(file, priv, i);
}

static int vidioc_s_audinput(struct file *file, void *priv,
        const struct v4l2_audio *i)
{
        struct cx23885_dev *dev = video_drvdata(file);

        if ((CX23885_VMUX_TELEVISION == INPUT(dev->input)->type) ||
                (CX23885_VMUX_CABLE == INPUT(dev->input)->type)) {
                return i->index != 2 ? -EINVAL : 0;
        }
        if (i->index > 1)
                return -EINVAL;

        dprintk(1, "%s(%d)\n", __func__, i->index);

        dev->audinput = i->index;

        /* Skip the audio defaults from the cards struct, caller wants
         * directly touch the audio mux hardware. */
        cx23885_flatiron_mux(dev, dev->audinput + 1);
        return 0;
}

static int vidioc_g_tuner(struct file *file, void *priv,
                                struct v4l2_tuner *t)
{
        struct cx23885_dev *dev = video_drvdata(file);

        if (dev->tuner_type == TUNER_ABSENT)
                return -EINVAL;
        if (0 != t->index)
                return -EINVAL;

        strscpy(t->name, "Television", sizeof(t->name));

        call_all(dev, tuner, g_tuner, t);
        return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
                                const struct v4l2_tuner *t)
{
        struct cx23885_dev *dev = video_drvdata(file);

        if (dev->tuner_type == TUNER_ABSENT)
                return -EINVAL;
        if (0 != t->index)
                return -EINVAL;
        /* Update the A/V core */
        call_all(dev, tuner, s_tuner, t);

        return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
                                struct v4l2_frequency *f)
{
        struct cx23885_dev *dev = video_drvdata(file);

        if (dev->tuner_type == TUNER_ABSENT)
                return -EINVAL;

        f->type = V4L2_TUNER_ANALOG_TV;
        f->frequency = dev->freq;

        call_all(dev, tuner, g_frequency, f);

        return 0;
}

static int cx23885_set_freq(struct cx23885_dev *dev, const struct v4l2_frequency *f)
{
        struct v4l2_ctrl *mute;
        int old_mute_val = 1;

        if (dev->tuner_type == TUNER_ABSENT)
                return -EINVAL;
        if (unlikely(f->tuner != 0))
                return -EINVAL;

        dev->freq = f->frequency;

        /* I need to mute audio here */
        mute = v4l2_ctrl_find(&dev->ctrl_handler, V4L2_CID_AUDIO_MUTE);
        if (mute) {
                old_mute_val = v4l2_ctrl_g_ctrl(mute);
                if (!old_mute_val)
                        v4l2_ctrl_s_ctrl(mute, 1);
        }

        call_all(dev, tuner, s_frequency, f);

        /* When changing channels it is required to reset TVAUDIO */
        msleep(100);

        /* I need to unmute audio here */
        if (old_mute_val == 0)
                v4l2_ctrl_s_ctrl(mute, old_mute_val);

        return 0;
}

static int cx23885_set_freq_via_ops(struct cx23885_dev *dev,
        const struct v4l2_frequency *f)
{
        struct v4l2_ctrl *mute;
        int old_mute_val = 1;
        struct vb2_dvb_frontend *vfe;
        struct dvb_frontend *fe;

        struct analog_parameters params = {
                .mode      = V4L2_TUNER_ANALOG_TV,
                .audmode   = V4L2_TUNER_MODE_STEREO,
                .std       = dev->tvnorm,
                .frequency = f->frequency
        };

        dev->freq = f->frequency;

        /* I need to mute audio here */
        mute = v4l2_ctrl_find(&dev->ctrl_handler, V4L2_CID_AUDIO_MUTE);
        if (mute) {
                old_mute_val = v4l2_ctrl_g_ctrl(mute);
                if (!old_mute_val)
                        v4l2_ctrl_s_ctrl(mute, 1);
        }

        /* If HVR1850 */
        dprintk(1, "%s() frequency=%d tuner=%d std=0x%llx\n", __func__,
                params.frequency, f->tuner, params.std);

        vfe = vb2_dvb_get_frontend(&dev->ts2.frontends, 1);
        if (!vfe) {
                return -EINVAL;
        }

        fe = vfe->dvb.frontend;

        if ((dev->board == CX23885_BOARD_HAUPPAUGE_HVR1850) ||
            (dev->board == CX23885_BOARD_HAUPPAUGE_HVR1255) ||
            (dev->board == CX23885_BOARD_HAUPPAUGE_HVR1255_22111) ||
            (dev->board == CX23885_BOARD_HAUPPAUGE_HVR1265_K4))
                fe = &dev->ts1.analog_fe;

        if (fe && fe->ops.tuner_ops.set_analog_params) {
                call_all(dev, video, s_std, dev->tvnorm);
                fe->ops.tuner_ops.set_analog_params(fe, &params);
        }
        else
                pr_err("%s() No analog tuner, aborting\n", __func__);

        /* When changing channels it is required to reset TVAUDIO */
        msleep(100);

        /* I need to unmute audio here */
        if (old_mute_val == 0)
                v4l2_ctrl_s_ctrl(mute, old_mute_val);

        return 0;
}

int cx23885_set_frequency(struct file *file, void *priv,
        const struct v4l2_frequency *f)
{
        struct cx23885_dev *dev = video_drvdata(file);
        int ret;

        switch (dev->board) {
        case CX23885_BOARD_HAUPPAUGE_HVR1255:
        case CX23885_BOARD_HAUPPAUGE_HVR1255_22111:
        case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:
        case CX23885_BOARD_HAUPPAUGE_HVR1850:
                ret = cx23885_set_freq_via_ops(dev, f);
                break;
        default:
                ret = cx23885_set_freq(dev, f);
        }

        return ret;
}

static int vidioc_s_frequency(struct file *file, void *priv,
        const struct v4l2_frequency *f)
{
        return cx23885_set_frequency(file, priv, f);
}

/* ----------------------------------------------------------- */

int cx23885_video_irq(struct cx23885_dev *dev, u32 status)
{
        u32 mask, count;
        int handled = 0;

        mask   = cx_read(VID_A_INT_MSK);
        if (0 == (status & mask))
                return handled;

        cx_write(VID_A_INT_STAT, status);

        /* risc op code error, fifo overflow or line sync detection error */
        if ((status & VID_BC_MSK_OPC_ERR) ||
                (status & VID_BC_MSK_SYNC) ||
                (status & VID_BC_MSK_OF)) {

                if (status & VID_BC_MSK_OPC_ERR) {
                        dprintk(7, " (VID_BC_MSK_OPC_ERR 0x%08x)\n",
                                VID_BC_MSK_OPC_ERR);
                        pr_warn("%s: video risc op code error\n",
                                dev->name);
                        cx23885_sram_channel_dump(dev,
                                &dev->sram_channels[SRAM_CH01]);
                }

                if (status & VID_BC_MSK_SYNC)
                        dprintk(7, " (VID_BC_MSK_SYNC 0x%08x) video lines miss-match\n",
                                VID_BC_MSK_SYNC);

                if (status & VID_BC_MSK_OF)
                        dprintk(7, " (VID_BC_MSK_OF 0x%08x) fifo overflow\n",
                                VID_BC_MSK_OF);

        }

        /* Video */
        if (status & VID_BC_MSK_RISCI1) {
                spin_lock(&dev->slock);
                count = cx_read(VID_A_GPCNT);
                cx23885_video_wakeup(dev, &dev->vidq, count);
                spin_unlock(&dev->slock);
                handled++;
        }

        /* Allow the VBI framework to process it's payload */
        handled += cx23885_vbi_irq(dev, status);

        return handled;
}

/* ----------------------------------------------------------- */
/* exported stuff                                              */

static const struct v4l2_file_operations video_fops = {
        .owner         = THIS_MODULE,
        .open           = v4l2_fh_open,
        .release        = vb2_fop_release,
        .read           = vb2_fop_read,
        .poll           = vb2_fop_poll,
        .unlocked_ioctl = video_ioctl2,
        .mmap           = vb2_fop_mmap,
};

static const struct v4l2_ioctl_ops video_ioctl_ops = {
        .vidioc_querycap      = vidioc_querycap,
        .vidioc_enum_fmt_vid_cap  = vidioc_enum_fmt_vid_cap,
        .vidioc_g_fmt_vid_cap     = vidioc_g_fmt_vid_cap,
        .vidioc_try_fmt_vid_cap   = vidioc_try_fmt_vid_cap,
        .vidioc_s_fmt_vid_cap     = vidioc_s_fmt_vid_cap,
        .vidioc_g_fmt_vbi_cap     = cx23885_vbi_fmt,
        .vidioc_try_fmt_vbi_cap   = cx23885_vbi_fmt,
        .vidioc_s_fmt_vbi_cap     = cx23885_vbi_fmt,
        .vidioc_reqbufs       = vb2_ioctl_reqbufs,
        .vidioc_prepare_buf   = vb2_ioctl_prepare_buf,
        .vidioc_querybuf      = vb2_ioctl_querybuf,
        .vidioc_qbuf          = vb2_ioctl_qbuf,
        .vidioc_dqbuf         = vb2_ioctl_dqbuf,
        .vidioc_streamon      = vb2_ioctl_streamon,
        .vidioc_streamoff     = vb2_ioctl_streamoff,
        .vidioc_g_pixelaspect = vidioc_g_pixelaspect,
        .vidioc_g_selection   = vidioc_g_selection,
        .vidioc_s_std         = vidioc_s_std,
        .vidioc_g_std         = vidioc_g_std,
        .vidioc_enum_input    = vidioc_enum_input,
        .vidioc_g_input       = vidioc_g_input,
        .vidioc_s_input       = vidioc_s_input,
        .vidioc_log_status    = vidioc_log_status,
        .vidioc_g_tuner       = vidioc_g_tuner,
        .vidioc_s_tuner       = vidioc_s_tuner,
        .vidioc_g_frequency   = vidioc_g_frequency,
        .vidioc_s_frequency   = vidioc_s_frequency,
#ifdef CONFIG_VIDEO_ADV_DEBUG
        .vidioc_g_chip_info   = cx23885_g_chip_info,
        .vidioc_g_register    = cx23885_g_register,
        .vidioc_s_register    = cx23885_s_register,
#endif
        .vidioc_enumaudio     = vidioc_enum_audinput,
        .vidioc_g_audio       = vidioc_g_audinput,
        .vidioc_s_audio       = vidioc_s_audinput,
        .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
        .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};

static struct video_device cx23885_vbi_template;
static struct video_device cx23885_video_template = {
        .name                 = "cx23885-video",
        .fops                 = &video_fops,
        .ioctl_ops            = &video_ioctl_ops,
        .tvnorms              = CX23885_NORMS,
};

void cx23885_video_unregister(struct cx23885_dev *dev)
{
        dprintk(1, "%s()\n", __func__);
        cx23885_irq_remove(dev, 0x01);

        if (dev->vbi_dev) {
                if (video_is_registered(dev->vbi_dev))
                        video_unregister_device(dev->vbi_dev);
                else
                        video_device_release(dev->vbi_dev);
                dev->vbi_dev = NULL;
        }
        if (dev->video_dev) {
                if (video_is_registered(dev->video_dev))
                        video_unregister_device(dev->video_dev);
                else
                        video_device_release(dev->video_dev);
                dev->video_dev = NULL;
        }

        if (dev->audio_dev)
                cx23885_audio_unregister(dev);
}

int cx23885_video_register(struct cx23885_dev *dev)
{
        struct vb2_queue *q;
        int err;

        dprintk(1, "%s()\n", __func__);

        /* Initialize VBI template */
        cx23885_vbi_template = cx23885_video_template;
        strscpy(cx23885_vbi_template.name, "cx23885-vbi",
                sizeof(cx23885_vbi_template.name));

        dev->tvnorm = V4L2_STD_NTSC_M;
        dev->fmt = format_by_fourcc(V4L2_PIX_FMT_YUYV);
        dev->field = V4L2_FIELD_INTERLACED;
        dev->width = 720;
        dev->height = norm_maxh(dev->tvnorm);

        /* init video dma queues */
        INIT_LIST_HEAD(&dev->vidq.active);

        /* init vbi dma queues */
        INIT_LIST_HEAD(&dev->vbiq.active);

        cx23885_irq_add_enable(dev, 0x01);

        if ((TUNER_ABSENT != dev->tuner_type) &&
                        ((dev->tuner_bus == 0) || (dev->tuner_bus == 1))) {
                struct v4l2_subdev *sd = NULL;

                if (dev->tuner_addr)
                        sd = v4l2_i2c_new_subdev(&dev->v4l2_dev,
                                &dev->i2c_bus[dev->tuner_bus].i2c_adap,
                                "tuner", dev->tuner_addr, NULL);
                else
                        sd = v4l2_i2c_new_subdev(&dev->v4l2_dev,
                                &dev->i2c_bus[dev->tuner_bus].i2c_adap,
                                "tuner", 0, v4l2_i2c_tuner_addrs(ADDRS_TV));
                if (sd) {
                        struct tuner_setup tun_setup;

                        memset(&tun_setup, 0, sizeof(tun_setup));
                        tun_setup.mode_mask = T_ANALOG_TV;
                        tun_setup.type = dev->tuner_type;
                        tun_setup.addr = v4l2_i2c_subdev_addr(sd);
                        tun_setup.tuner_callback = cx23885_tuner_callback;

                        v4l2_subdev_call(sd, tuner, s_type_addr, &tun_setup);

                        if ((dev->board == CX23885_BOARD_LEADTEK_WINFAST_PXTV1200) ||
                            (dev->board == CX23885_BOARD_LEADTEK_WINFAST_PXPVR2200)) {
                                struct xc2028_ctrl ctrl = {
                                        .fname = XC2028_DEFAULT_FIRMWARE,
                                        .max_len = 64
                                };
                                struct v4l2_priv_tun_config cfg = {
                                        .tuner = dev->tuner_type,
                                        .priv = &ctrl
                                };
                                v4l2_subdev_call(sd, tuner, s_config, &cfg);
                        }

                        if (dev->board == CX23885_BOARD_AVERMEDIA_HC81R) {
                                struct xc2028_ctrl ctrl = {
                                        .fname = "xc3028L-v36.fw",
                                        .max_len = 64
                                };
                                struct v4l2_priv_tun_config cfg = {
                                        .tuner = dev->tuner_type,
                                        .priv = &ctrl
                                };
                                v4l2_subdev_call(sd, tuner, s_config, &cfg);
                        }
                }
        }

        /* initial device configuration */
        mutex_lock(&dev->lock);
        cx23885_set_tvnorm(dev, dev->tvnorm);
        cx23885_video_mux(dev, 0);
        cx23885_audio_mux(dev, 0);
        mutex_unlock(&dev->lock);

        q = &dev->vb2_vidq;
        q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ;
        q->gfp_flags = GFP_DMA32;
        q->min_buffers_needed = 2;
        q->drv_priv = dev;
        q->buf_struct_size = sizeof(struct cx23885_buffer);
        q->ops = &cx23885_video_qops;
        q->mem_ops = &vb2_dma_sg_memops;
        q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        q->lock = &dev->lock;
        q->dev = &dev->pci->dev;

        err = vb2_queue_init(q);
        if (err < 0)
                goto fail_unreg;

        q = &dev->vb2_vbiq;
        q->type = V4L2_BUF_TYPE_VBI_CAPTURE;
        q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ;
        q->gfp_flags = GFP_DMA32;
        q->min_buffers_needed = 2;
        q->drv_priv = dev;
        q->buf_struct_size = sizeof(struct cx23885_buffer);
        q->ops = &cx23885_vbi_qops;
        q->mem_ops = &vb2_dma_sg_memops;
        q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        q->lock = &dev->lock;
        q->dev = &dev->pci->dev;

        err = vb2_queue_init(q);
        if (err < 0)
                goto fail_unreg;

        /* register Video device */
        dev->video_dev = cx23885_vdev_init(dev, dev->pci,
                &cx23885_video_template, "video");
        dev->video_dev->queue = &dev->vb2_vidq;
        dev->video_dev->device_caps = V4L2_CAP_READWRITE | V4L2_CAP_STREAMING |
                                      V4L2_CAP_AUDIO | V4L2_CAP_VIDEO_CAPTURE;
        if (dev->tuner_type != TUNER_ABSENT)
                dev->video_dev->device_caps |= V4L2_CAP_TUNER;
        err = video_register_device(dev->video_dev, VFL_TYPE_GRABBER,
                                    video_nr[dev->nr]);
        if (err < 0) {
                pr_info("%s: can't register video device\n",
                        dev->name);
                goto fail_unreg;
        }
        pr_info("%s: registered device %s [v4l2]\n",
               dev->name, video_device_node_name(dev->video_dev));

        /* register VBI device */
        dev->vbi_dev = cx23885_vdev_init(dev, dev->pci,
                &cx23885_vbi_template, "vbi");
        dev->vbi_dev->queue = &dev->vb2_vbiq;
        dev->vbi_dev->device_caps = V4L2_CAP_READWRITE | V4L2_CAP_STREAMING |
                                    V4L2_CAP_AUDIO | V4L2_CAP_VBI_CAPTURE;
        if (dev->tuner_type != TUNER_ABSENT)
                dev->vbi_dev->device_caps |= V4L2_CAP_TUNER;
        err = video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
                                    vbi_nr[dev->nr]);
        if (err < 0) {
                pr_info("%s: can't register vbi device\n",
                        dev->name);
                goto fail_unreg;
        }
        pr_info("%s: registered device %s\n",
               dev->name, video_device_node_name(dev->vbi_dev));

        /* Register ALSA audio device */
        dev->audio_dev = cx23885_audio_register(dev);

        return 0;

fail_unreg:
        cx23885_video_unregister(dev);
        return err;
}