drivers/media/video/pvrusb2/pvrusb2-video-v4l.c

   1 /*
   2  *
   3  *  $Id$
   4  *
   5  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   6  *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
   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
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22
  23 /*
  24
  25    This source file is specifically designed to interface with the
  26    saa711x support that is available in the v4l available starting
  27    with linux 2.6.15.
  28
  29 */
  30
  31 #include "pvrusb2-video-v4l.h"
  32 #include "pvrusb2-i2c-cmd-v4l2.h"
  33
  34
  35 #include "pvrusb2-hdw-internal.h"
  36 #include "pvrusb2-debug.h"
  37 #include <linux/videodev2.h>
  38 #include <media/v4l2-common.h>
  39 #include <media/saa7115.h>
  40 #include <linux/errno.h>
  41 #include <linux/slab.h>
  42
  43 struct pvr2_v4l_decoder {
  44         struct pvr2_i2c_handler handler;
  45         struct pvr2_decoder_ctrl ctrl;
  46         struct pvr2_i2c_client *client;
  47         struct pvr2_hdw *hdw;
  48         unsigned long stale_mask;
  49 };
  50
  51
  52 static void set_input(struct pvr2_v4l_decoder *ctxt)
  53 {
  54         struct pvr2_hdw *hdw = ctxt->hdw;
  55         struct v4l2_routing route;
  56
  57         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 set_input(%d)",hdw->input_val);
  58         switch(hdw->input_val) {
  59         case PVR2_CVAL_INPUT_TV:
  60                 route.input = SAA7115_COMPOSITE4;
  61                 break;
  62         case PVR2_CVAL_INPUT_COMPOSITE:
  63                 route.input = SAA7115_COMPOSITE5;
  64                 break;
  65         case PVR2_CVAL_INPUT_SVIDEO:
  66                 route.input = SAA7115_SVIDEO2;
  67                 break;
  68         case PVR2_CVAL_INPUT_RADIO:
  69                 // In radio mode, we mute the video, but point at one
  70                 // spot just to stay consistent
  71                 route.input = SAA7115_COMPOSITE5;
  72         default:
  73                 return;
  74         }
  75         route.output = 0;
  76         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_VIDEO_ROUTING,&route);
  77 }
  78
  79
  80 static int check_input(struct pvr2_v4l_decoder *ctxt)
  81 {
  82         struct pvr2_hdw *hdw = ctxt->hdw;
  83         return hdw->input_dirty != 0;
  84 }
  85
  86
  87 static void set_audio(struct pvr2_v4l_decoder *ctxt)
  88 {
  89         u32 val;
  90         struct pvr2_hdw *hdw = ctxt->hdw;
  91
  92         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 set_audio %d",
  93                    hdw->srate_val);
  94         switch (hdw->srate_val) {
  95         default:
  96         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000:
  97                 val = 48000;
  98                 break;
  99         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100:
 100                 val = 44100;
 101                 break;
 102         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000:
 103                 val = 32000;
 104                 break;
 105         }
 106         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_AUDIO_CLOCK_FREQ,&val);
 107 }
 108
 109
 110 static int check_audio(struct pvr2_v4l_decoder *ctxt)
 111 {
 112         struct pvr2_hdw *hdw = ctxt->hdw;
 113         return hdw->srate_dirty != 0;
 114 }
 115
 116
 117 struct pvr2_v4l_decoder_ops {
 118         void (*update)(struct pvr2_v4l_decoder *);
 119         int (*check)(struct pvr2_v4l_decoder *);
 120 };
 121
 122
 123 static const struct pvr2_v4l_decoder_ops decoder_ops[] = {
 124         { .update = set_input, .check = check_input},
 125         { .update = set_audio, .check = check_audio},
 126 };
 127
 128
 129 static void decoder_detach(struct pvr2_v4l_decoder *ctxt)
 130 {
 131         ctxt->client->handler = NULL;
 132         ctxt->hdw->decoder_ctrl = NULL;
 133         kfree(ctxt);
 134 }
 135
 136
 137 static int decoder_check(struct pvr2_v4l_decoder *ctxt)
 138 {
 139         unsigned long msk;
 140         unsigned int idx;
 141
 142         for (idx = 0; idx < ARRAY_SIZE(decoder_ops); idx++) {
 143                 msk = 1 << idx;
 144                 if (ctxt->stale_mask & msk) continue;
 145                 if (decoder_ops[idx].check(ctxt)) {
 146                         ctxt->stale_mask |= msk;
 147                 }
 148         }
 149         return ctxt->stale_mask != 0;
 150 }
 151
 152
 153 static void decoder_update(struct pvr2_v4l_decoder *ctxt)
 154 {
 155         unsigned long msk;
 156         unsigned int idx;
 157
 158         for (idx = 0; idx < ARRAY_SIZE(decoder_ops); idx++) {
 159                 msk = 1 << idx;
 160                 if (!(ctxt->stale_mask & msk)) continue;
 161                 ctxt->stale_mask &= ~msk;
 162                 decoder_ops[idx].update(ctxt);
 163         }
 164 }
 165
 166
 167 static int decoder_detect(struct pvr2_i2c_client *cp)
 168 {
 169         /* Attempt to query the decoder - let's see if it will answer */
 170         struct v4l2_tuner vt;
 171         int ret;
 172
 173         memset(&vt,0,sizeof(vt));
 174         ret = pvr2_i2c_client_cmd(cp,VIDIOC_G_TUNER,&vt);
 175         return ret == 0; /* Return true if it answered */
 176 }
 177
 178
 179 static void decoder_enable(struct pvr2_v4l_decoder *ctxt,int fl)
 180 {
 181         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 decoder_enable(%d)",fl);
 182         pvr2_v4l2_cmd_stream(ctxt->client,fl);
 183 }
 184
 185
 186 static unsigned int decoder_describe(struct pvr2_v4l_decoder *ctxt,char *buf,unsigned int cnt)
 187 {
 188         return scnprintf(buf,cnt,"handler: pvrusb2-video-v4l");
 189 }
 190
 191
 192 static const struct pvr2_i2c_handler_functions hfuncs = {
 193         .detach = (void (*)(void *))decoder_detach,
 194         .check = (int (*)(void *))decoder_check,
 195         .update = (void (*)(void *))decoder_update,
 196         .describe = (unsigned int (*)(void *,char *,unsigned int))decoder_describe,
 197 };
 198
 199
 200 int pvr2_i2c_decoder_v4l_setup(struct pvr2_hdw *hdw,
 201                                struct pvr2_i2c_client *cp)
 202 {
 203         struct pvr2_v4l_decoder *ctxt;
 204
 205         if (hdw->decoder_ctrl) return 0;
 206         if (cp->handler) return 0;
 207         if (!decoder_detect(cp)) return 0;
 208
 209         ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
 210         if (!ctxt) return 0;
 211
 212         ctxt->handler.func_data = ctxt;
 213         ctxt->handler.func_table = &hfuncs;
 214         ctxt->ctrl.ctxt = ctxt;
 215         ctxt->ctrl.detach = (void (*)(void *))decoder_detach;
 216         ctxt->ctrl.enable = (void (*)(void *,int))decoder_enable;
 217         ctxt->client = cp;
 218         ctxt->hdw = hdw;
 219         ctxt->stale_mask = (1 << ARRAY_SIZE(decoder_ops)) - 1;
 220         hdw->decoder_ctrl = &ctxt->ctrl;
 221         cp->handler = &ctxt->handler;
 222         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x saa711x V4L2 handler set up",
 223                    cp->client->addr);
 224         return !0;
 225 }
 226
 227
 228
 229
 230 /*
 231   Stuff for Emacs to see, in order to encourage consistent editing style:
 232   *** Local Variables: ***
 233   *** mode: c ***
 234   *** fill-column: 70 ***
 235   *** tab-width: 8 ***
 236   *** c-basic-offset: 8 ***
 237   *** End: ***
 238   */