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                 // ????? No idea yet what to do here
  70         default:
  71                 return;
  72         }
  73         route.output = 0;
  74         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_VIDEO_ROUTING,&route);
  75 }
  76
  77
  78 static int check_input(struct pvr2_v4l_decoder *ctxt)
  79 {
  80         struct pvr2_hdw *hdw = ctxt->hdw;
  81         return hdw->input_dirty != 0;
  82 }
  83
  84
  85 static void set_audio(struct pvr2_v4l_decoder *ctxt)
  86 {
  87         u32 val;
  88         struct pvr2_hdw *hdw = ctxt->hdw;
  89
  90         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 set_audio %d",
  91                    hdw->srate_val);
  92         switch (hdw->srate_val) {
  93         default:
  94         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000:
  95                 val = 48000;
  96                 break;
  97         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100:
  98                 val = 44100;
  99                 break;
 100         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000:
 101                 val = 32000;
 102                 break;
 103         }
 104         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_AUDIO_CLOCK_FREQ,&val);
 105 }
 106
 107
 108 static int check_audio(struct pvr2_v4l_decoder *ctxt)
 109 {
 110         struct pvr2_hdw *hdw = ctxt->hdw;
 111         return hdw->srate_dirty != 0;
 112 }
 113
 114
 115 struct pvr2_v4l_decoder_ops {
 116         void (*update)(struct pvr2_v4l_decoder *);
 117         int (*check)(struct pvr2_v4l_decoder *);
 118 };
 119
 120
 121 static const struct pvr2_v4l_decoder_ops decoder_ops[] = {
 122         { .update = set_input, .check = check_input},
 123         { .update = set_audio, .check = check_audio},
 124 };
 125
 126
 127 static void decoder_detach(struct pvr2_v4l_decoder *ctxt)
 128 {
 129         ctxt->client->handler = NULL;
 130         ctxt->hdw->decoder_ctrl = NULL;
 131         kfree(ctxt);
 132 }
 133
 134
 135 static int decoder_check(struct pvr2_v4l_decoder *ctxt)
 136 {
 137         unsigned long msk;
 138         unsigned int idx;
 139
 140         for (idx = 0; idx < sizeof(decoder_ops)/sizeof(decoder_ops[0]);
 141              idx++) {
 142                 msk = 1 << idx;
 143                 if (ctxt->stale_mask & msk) continue;
 144                 if (decoder_ops[idx].check(ctxt)) {
 145                         ctxt->stale_mask |= msk;
 146                 }
 147         }
 148         return ctxt->stale_mask != 0;
 149 }
 150
 151
 152 static void decoder_update(struct pvr2_v4l_decoder *ctxt)
 153 {
 154         unsigned long msk;
 155         unsigned int idx;
 156
 157         for (idx = 0; idx < sizeof(decoder_ops)/sizeof(decoder_ops[0]);
 158              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 int decoder_is_tuned(struct pvr2_v4l_decoder *ctxt)
 187 {
 188         struct v4l2_tuner vt;
 189         int ret;
 190
 191         memset(&vt,0,sizeof(vt));
 192         ret = pvr2_i2c_client_cmd(ctxt->client,VIDIOC_G_TUNER,&vt);
 193         if (ret < 0) return -EINVAL;
 194         return vt.signal ? 1 : 0;
 195 }
 196
 197
 198 static unsigned int decoder_describe(struct pvr2_v4l_decoder *ctxt,char *buf,unsigned int cnt)
 199 {
 200         return scnprintf(buf,cnt,"handler: pvrusb2-video-v4l");
 201 }
 202
 203
 204 static const struct pvr2_i2c_handler_functions hfuncs = {
 205         .detach = (void (*)(void *))decoder_detach,
 206         .check = (int (*)(void *))decoder_check,
 207         .update = (void (*)(void *))decoder_update,
 208         .describe = (unsigned int (*)(void *,char *,unsigned int))decoder_describe,
 209 };
 210
 211
 212 int pvr2_i2c_decoder_v4l_setup(struct pvr2_hdw *hdw,
 213                                struct pvr2_i2c_client *cp)
 214 {
 215         struct pvr2_v4l_decoder *ctxt;
 216
 217         if (hdw->decoder_ctrl) return 0;
 218         if (cp->handler) return 0;
 219         if (!decoder_detect(cp)) return 0;
 220
 221         ctxt = kmalloc(sizeof(*ctxt),GFP_KERNEL);
 222         if (!ctxt) return 0;
 223         memset(ctxt,0,sizeof(*ctxt));
 224
 225         ctxt->handler.func_data = ctxt;
 226         ctxt->handler.func_table = &hfuncs;
 227         ctxt->ctrl.ctxt = ctxt;
 228         ctxt->ctrl.detach = (void (*)(void *))decoder_detach;
 229         ctxt->ctrl.enable = (void (*)(void *,int))decoder_enable;
 230         ctxt->ctrl.tuned = (int (*)(void *))decoder_is_tuned;
 231         ctxt->client = cp;
 232         ctxt->hdw = hdw;
 233         ctxt->stale_mask = (1 << (sizeof(decoder_ops)/
 234                                   sizeof(decoder_ops[0]))) - 1;
 235         hdw->decoder_ctrl = &ctxt->ctrl;
 236         cp->handler = &ctxt->handler;
 237         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x saa711x V4L2 handler set up",
 238                    cp->client->addr);
 239         return !0;
 240 }
 241
 242
 243
 244
 245 /*
 246   Stuff for Emacs to see, in order to encourage consistent editing style:
 247   *** Local Variables: ***
 248   *** mode: c ***
 249   *** fill-column: 70 ***
 250   *** tab-width: 8 ***
 251   *** c-basic-offset: 8 ***
 252   *** End: ***
 253   */