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 struct routing_scheme {
  53         const int *def;
  54         unsigned int cnt;
  55 };
  56
  57
  58 static const int routing_scheme0[] = {
  59         [PVR2_CVAL_INPUT_TV] = SAA7115_COMPOSITE4,
  60         /* In radio mode, we mute the video, but point at one
  61            spot just to stay consistent */
  62         [PVR2_CVAL_INPUT_RADIO] = SAA7115_COMPOSITE5,
  63         [PVR2_CVAL_INPUT_COMPOSITE] = SAA7115_COMPOSITE5,
  64         [PVR2_CVAL_INPUT_SVIDEO] =  SAA7115_SVIDEO2,
  65 };
  66
  67 static const struct routing_scheme routing_schemes[] = {
  68         [PVR2_ROUTING_SCHEME_HAUPPAUGE] = {
  69                 .def = routing_scheme0,
  70                 .cnt = ARRAY_SIZE(routing_scheme0),
  71         },
  72 };
  73
  74 static void set_input(struct pvr2_v4l_decoder *ctxt)
  75 {
  76         struct pvr2_hdw *hdw = ctxt->hdw;
  77         struct v4l2_routing route;
  78         const struct routing_scheme *sp;
  79         unsigned int sid = hdw->hdw_desc->signal_routing_scheme;
  80
  81         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 set_input(%d)",hdw->input_val);
  82
  83         if ((sid < ARRAY_SIZE(routing_schemes)) &&
  84             ((sp = routing_schemes + sid) != NULL) &&
  85             (hdw->input_val >= 0) &&
  86             (hdw->input_val < sp->cnt)) {
  87                 route.input = sp->def[hdw->input_val];
  88         } else {
  89                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
  90                            "*** WARNING *** i2c v4l2 set_input:"
  91                            " Invalid routing scheme (%u) and/or input (%d)",
  92                            sid,hdw->input_val);
  93                 return;
  94         }
  95
  96         route.output = 0;
  97         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_VIDEO_ROUTING,&route);
  98 }
  99
 100
 101 static int check_input(struct pvr2_v4l_decoder *ctxt)
 102 {
 103         struct pvr2_hdw *hdw = ctxt->hdw;
 104         return hdw->input_dirty != 0;
 105 }
 106
 107
 108 static void set_audio(struct pvr2_v4l_decoder *ctxt)
 109 {
 110         u32 val;
 111         struct pvr2_hdw *hdw = ctxt->hdw;
 112
 113         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 set_audio %d",
 114                    hdw->srate_val);
 115         switch (hdw->srate_val) {
 116         default:
 117         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000:
 118                 val = 48000;
 119                 break;
 120         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100:
 121                 val = 44100;
 122                 break;
 123         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000:
 124                 val = 32000;
 125                 break;
 126         }
 127         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_AUDIO_CLOCK_FREQ,&val);
 128 }
 129
 130
 131 static int check_audio(struct pvr2_v4l_decoder *ctxt)
 132 {
 133         struct pvr2_hdw *hdw = ctxt->hdw;
 134         return hdw->srate_dirty != 0;
 135 }
 136
 137
 138 struct pvr2_v4l_decoder_ops {
 139         void (*update)(struct pvr2_v4l_decoder *);
 140         int (*check)(struct pvr2_v4l_decoder *);
 141 };
 142
 143
 144 static const struct pvr2_v4l_decoder_ops decoder_ops[] = {
 145         { .update = set_input, .check = check_input},
 146         { .update = set_audio, .check = check_audio},
 147 };
 148
 149
 150 static void decoder_detach(struct pvr2_v4l_decoder *ctxt)
 151 {
 152         ctxt->client->handler = NULL;
 153         pvr2_hdw_set_decoder(ctxt->hdw,NULL);
 154         kfree(ctxt);
 155 }
 156
 157
 158 static int decoder_check(struct pvr2_v4l_decoder *ctxt)
 159 {
 160         unsigned long msk;
 161         unsigned int idx;
 162
 163         for (idx = 0; idx < ARRAY_SIZE(decoder_ops); idx++) {
 164                 msk = 1 << idx;
 165                 if (ctxt->stale_mask & msk) continue;
 166                 if (decoder_ops[idx].check(ctxt)) {
 167                         ctxt->stale_mask |= msk;
 168                 }
 169         }
 170         return ctxt->stale_mask != 0;
 171 }
 172
 173
 174 static void decoder_update(struct pvr2_v4l_decoder *ctxt)
 175 {
 176         unsigned long msk;
 177         unsigned int idx;
 178
 179         for (idx = 0; idx < ARRAY_SIZE(decoder_ops); idx++) {
 180                 msk = 1 << idx;
 181                 if (!(ctxt->stale_mask & msk)) continue;
 182                 ctxt->stale_mask &= ~msk;
 183                 decoder_ops[idx].update(ctxt);
 184         }
 185 }
 186
 187
 188 static int decoder_detect(struct pvr2_i2c_client *cp)
 189 {
 190         /* Attempt to query the decoder - let's see if it will answer */
 191         struct v4l2_tuner vt;
 192         int ret;
 193
 194         memset(&vt,0,sizeof(vt));
 195         ret = pvr2_i2c_client_cmd(cp,VIDIOC_G_TUNER,&vt);
 196         return ret == 0; /* Return true if it answered */
 197 }
 198
 199
 200 static void decoder_enable(struct pvr2_v4l_decoder *ctxt,int fl)
 201 {
 202         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 decoder_enable(%d)",fl);
 203         pvr2_v4l2_cmd_stream(ctxt->client,fl);
 204 }
 205
 206
 207 static unsigned int decoder_describe(struct pvr2_v4l_decoder *ctxt,char *buf,unsigned int cnt)
 208 {
 209         return scnprintf(buf,cnt,"handler: pvrusb2-video-v4l");
 210 }
 211
 212
 213 static const struct pvr2_i2c_handler_functions hfuncs = {
 214         .detach = (void (*)(void *))decoder_detach,
 215         .check = (int (*)(void *))decoder_check,
 216         .update = (void (*)(void *))decoder_update,
 217         .describe = (unsigned int (*)(void *,char *,unsigned int))decoder_describe,
 218 };
 219
 220
 221 int pvr2_i2c_decoder_v4l_setup(struct pvr2_hdw *hdw,
 222                                struct pvr2_i2c_client *cp)
 223 {
 224         struct pvr2_v4l_decoder *ctxt;
 225
 226         if (hdw->decoder_ctrl) return 0;
 227         if (cp->handler) return 0;
 228         if (!decoder_detect(cp)) return 0;
 229
 230         ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
 231         if (!ctxt) return 0;
 232
 233         ctxt->handler.func_data = ctxt;
 234         ctxt->handler.func_table = &hfuncs;
 235         ctxt->ctrl.ctxt = ctxt;
 236         ctxt->ctrl.detach = (void (*)(void *))decoder_detach;
 237         ctxt->ctrl.enable = (void (*)(void *,int))decoder_enable;
 238         ctxt->client = cp;
 239         ctxt->hdw = hdw;
 240         ctxt->stale_mask = (1 << ARRAY_SIZE(decoder_ops)) - 1;
 241         pvr2_hdw_set_decoder(hdw,&ctxt->ctrl);
 242         cp->handler = &ctxt->handler;
 243         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x saa711x V4L2 handler set up",
 244                    cp->client->addr);
 245         return !0;
 246 }
 247
 248
 249
 250
 251 /*
 252   Stuff for Emacs to see, in order to encourage consistent editing style:
 253   *** Local Variables: ***
 254   *** mode: c ***
 255   *** fill-column: 70 ***
 256   *** tab-width: 8 ***
 257   *** c-basic-offset: 8 ***
 258   *** End: ***
 259   */