drivers/media/video/cx18/cx18-controls.c

   1 /*
   2  *  cx18 ioctl control functions
   3  *
   4  *  Derived from ivtv-controls.c
   5  *
   6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21  *  02111-1307  USA
  22  */
  23 #include <linux/kernel.h>
  24 #include <linux/slab.h>
  25
  26 #include "cx18-driver.h"
  27 #include "cx18-cards.h"
  28 #include "cx18-ioctl.h"
  29 #include "cx18-audio.h"
  30 #include "cx18-mailbox.h"
  31 #include "cx18-controls.h"
  32
  33 static int cx18_s_stream_vbi_fmt(struct cx2341x_handler *cxhdl, u32 fmt)
  34 {
  35         struct cx18 *cx = container_of(cxhdl, struct cx18, cxhdl);
  36         int type = cxhdl->stream_type->val;
  37
  38         if (atomic_read(&cx->ana_capturing) > 0)
  39                 return -EBUSY;
  40
  41         if (fmt != V4L2_MPEG_STREAM_VBI_FMT_IVTV ||
  42             !(type == V4L2_MPEG_STREAM_TYPE_MPEG2_PS ||
  43               type == V4L2_MPEG_STREAM_TYPE_MPEG2_DVD ||
  44               type == V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD)) {
  45                 /* Only IVTV fmt VBI insertion & only MPEG-2 PS type streams */
  46                 cx->vbi.insert_mpeg = V4L2_MPEG_STREAM_VBI_FMT_NONE;
  47                 CX18_DEBUG_INFO("disabled insertion of sliced VBI data into "
  48                                 "the MPEG stream\n");
  49                 return 0;
  50         }
  51
  52         /* Allocate sliced VBI buffers if needed. */
  53         if (cx->vbi.sliced_mpeg_data[0] == NULL) {
  54                 int i;
  55
  56                 for (i = 0; i < CX18_VBI_FRAMES; i++) {
  57                         cx->vbi.sliced_mpeg_data[i] =
  58                                kmalloc(CX18_SLICED_MPEG_DATA_BUFSZ, GFP_KERNEL);
  59                         if (cx->vbi.sliced_mpeg_data[i] == NULL) {
  60                                 while (--i >= 0) {
  61                                         kfree(cx->vbi.sliced_mpeg_data[i]);
  62                                         cx->vbi.sliced_mpeg_data[i] = NULL;
  63                                 }
  64                                 cx->vbi.insert_mpeg =
  65                                                   V4L2_MPEG_STREAM_VBI_FMT_NONE;
  66                                 CX18_WARN("Unable to allocate buffers for "
  67                                           "sliced VBI data insertion\n");
  68                                 return -ENOMEM;
  69                         }
  70                 }
  71         }
  72
  73         cx->vbi.insert_mpeg = fmt;
  74         CX18_DEBUG_INFO("enabled insertion of sliced VBI data into the MPEG PS,"
  75                         "when sliced VBI is enabled\n");
  76
  77         /*
  78          * If our current settings have no lines set for capture, store a valid,
  79          * default set of service lines to capture, in our current settings.
  80          */
  81         if (cx18_get_service_set(cx->vbi.sliced_in) == 0) {
  82                 if (cx->is_60hz)
  83                         cx->vbi.sliced_in->service_set =
  84                                                         V4L2_SLICED_CAPTION_525;
  85                 else
  86                         cx->vbi.sliced_in->service_set = V4L2_SLICED_WSS_625;
  87                 cx18_expand_service_set(cx->vbi.sliced_in, cx->is_50hz);
  88         }
  89         return 0;
  90 }
  91
  92 static int cx18_s_video_encoding(struct cx2341x_handler *cxhdl, u32 val)
  93 {
  94         struct cx18 *cx = container_of(cxhdl, struct cx18, cxhdl);
  95         int is_mpeg1 = val == V4L2_MPEG_VIDEO_ENCODING_MPEG_1;
  96         struct v4l2_mbus_framefmt fmt;
  97
  98         /* fix videodecoder resolution */
  99         fmt.width = cxhdl->width / (is_mpeg1 ? 2 : 1);
 100         fmt.height = cxhdl->height;
 101         fmt.code = V4L2_MBUS_FMT_FIXED;
 102         v4l2_subdev_call(cx->sd_av, video, s_mbus_fmt, &fmt);
 103         return 0;
 104 }
 105
 106 static int cx18_s_audio_sampling_freq(struct cx2341x_handler *cxhdl, u32 idx)
 107 {
 108         static const u32 freqs[3] = { 44100, 48000, 32000 };
 109         struct cx18 *cx = container_of(cxhdl, struct cx18, cxhdl);
 110
 111         /* The audio clock of the digitizer must match the codec sample
 112            rate otherwise you get some very strange effects. */
 113         if (idx < ARRAY_SIZE(freqs))
 114                 cx18_call_all(cx, audio, s_clock_freq, freqs[idx]);
 115         return 0;
 116 }
 117
 118 static int cx18_s_audio_mode(struct cx2341x_handler *cxhdl, u32 val)
 119 {
 120         struct cx18 *cx = container_of(cxhdl, struct cx18, cxhdl);
 121
 122         cx->dualwatch_stereo_mode = val;
 123         return 0;
 124 }
 125
 126 struct cx2341x_handler_ops cx18_cxhdl_ops = {
 127         .s_audio_mode = cx18_s_audio_mode,
 128         .s_audio_sampling_freq = cx18_s_audio_sampling_freq,
 129         .s_video_encoding = cx18_s_video_encoding,
 130         .s_stream_vbi_fmt = cx18_s_stream_vbi_fmt,
 131 };