cx18-controls.c

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/*
 *  cx18 ioctl control functions
 *
 *  Derived from ivtv-controls.c
 *
 *  Copyright (C) 2007  Hans Verkuil <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA
 */
#include <linux/kernel.h>
#include <linux/slab.h>

#include "cx18-driver.h"
#include "cx18-cards.h"
#include "cx18-ioctl.h"
#include "cx18-audio.h"
#include "cx18-mailbox.h"
#include "cx18-controls.h"

static int cx18_s_stream_vbi_fmt(struct cx2341x_handler *cxhdl, u32 fmt)
{
    struct cx18 *cx = container_of(cxhdl, struct cx18, cxhdl);
    int type = cxhdl->stream_type->val;

    if (atomic_read(&cx->ana_capturing) > 0)
        return -EBUSY;

    if (fmt != V4L2_MPEG_STREAM_VBI_FMT_IVTV ||
        !(type == V4L2_MPEG_STREAM_TYPE_MPEG2_PS ||
          type == V4L2_MPEG_STREAM_TYPE_MPEG2_DVD ||
          type == V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD)) {
        /* Only IVTV fmt VBI insertion & only MPEG-2 PS type streams */
        cx->vbi.insert_mpeg = V4L2_MPEG_STREAM_VBI_FMT_NONE;
        CX18_DEBUG_INFO("disabled insertion of sliced VBI data into "
                "the MPEG stream\n");
        return 0;
    }

    /* Allocate sliced VBI buffers if needed. */
    if (cx->vbi.sliced_mpeg_data[0] == NULL) {
        int i;

        for (i = 0; i < CX18_VBI_FRAMES; i++) {
            cx->vbi.sliced_mpeg_data[i] =
                   kmalloc(CX18_SLICED_MPEG_DATA_BUFSZ, GFP_KERNEL);
            if (cx->vbi.sliced_mpeg_data[i] == NULL) {
                while (--i >= 0) {
                    kfree(cx->vbi.sliced_mpeg_data[i]);
                    cx->vbi.sliced_mpeg_data[i] = NULL;
                }
                cx->vbi.insert_mpeg =
                          V4L2_MPEG_STREAM_VBI_FMT_NONE;
                CX18_WARN("Unable to allocate buffers for "
                      "sliced VBI data insertion\n");
                return -ENOMEM;
            }
        }
    }

    cx->vbi.insert_mpeg = fmt;
    CX18_DEBUG_INFO("enabled insertion of sliced VBI data into the MPEG PS,"
            "when sliced VBI is enabled\n");

    /*
     * If our current settings have no lines set for capture, store a valid,
     * default set of service lines to capture, in our current settings.
     */
    if (cx18_get_service_set(cx->vbi.sliced_in) == 0) {
        if (cx->is_60hz)
            cx->vbi.sliced_in->service_set =
                            V4L2_SLICED_CAPTION_525;
        else
            cx->vbi.sliced_in->service_set = V4L2_SLICED_WSS_625;
        cx18_expand_service_set(cx->vbi.sliced_in, cx->is_50hz);
    }
    return 0;
}

static int cx18_s_video_encoding(struct cx2341x_handler *cxhdl, u32 val)
{
    struct cx18 *cx = container_of(cxhdl, struct cx18, cxhdl);
    int is_mpeg1 = val == V4L2_MPEG_VIDEO_ENCODING_MPEG_1;
    struct v4l2_mbus_framefmt fmt;

    /* fix videodecoder resolution */
    fmt.width = cxhdl->width / (is_mpeg1 ? 2 : 1);
    fmt.height = cxhdl->height;
    fmt.code = V4L2_MBUS_FMT_FIXED;
    v4l2_subdev_call(cx->sd_av, video, s_mbus_fmt, &fmt);
    return 0;
}

static int cx18_s_audio_sampling_freq(struct cx2341x_handler *cxhdl, u32 idx)
{
    static const u32 freqs[3] = { 44100, 48000, 32000 };
    struct cx18 *cx = container_of(cxhdl, struct cx18, cxhdl);

    /* The audio clock of the digitizer must match the codec sample
       rate otherwise you get some very strange effects. */
    if (idx < ARRAY_SIZE(freqs))
        cx18_call_all(cx, audio, s_clock_freq, freqs[idx]);
    return 0;
}

static int cx18_s_audio_mode(struct cx2341x_handler *cxhdl, u32 val)
{
    struct cx18 *cx = container_of(cxhdl, struct cx18, cxhdl);

    cx->dualwatch_stereo_mode = val;
    return 0;
}

struct cx2341x_handler_ops cx18_cxhdl_ops = {
    .s_audio_mode = cx18_s_audio_mode,
    .s_audio_sampling_freq = cx18_s_audio_sampling_freq,
    .s_video_encoding = cx18_s_video_encoding,
    .s_stream_vbi_fmt = cx18_s_stream_vbi_fmt,
};