release/src-rt-6.x/linux/linux-2.6/drivers/media/video/pvrusb2/pvrusb2-audio.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 #include "pvrusb2-audio.h"
  24 #include "pvrusb2-hdw-internal.h"
  25 #include "pvrusb2-debug.h"
  26 #include <linux/videodev2.h>
  27 #include <media/msp3400.h>
  28 #include <media/v4l2-common.h>
  29
  30 struct pvr2_msp3400_handler {
  31         struct pvr2_hdw *hdw;
  32         struct pvr2_i2c_client *client;
  33         struct pvr2_i2c_handler i2c_handler;
  34         unsigned long stale_mask;
  35 };
  36
  37
  38 /* This function selects the correct audio input source */
  39 static void set_stereo(struct pvr2_msp3400_handler *ctxt)
  40 {
  41         struct pvr2_hdw *hdw = ctxt->hdw;
  42         struct v4l2_routing route;
  43
  44         pvr2_trace(PVR2_TRACE_CHIPS,"i2c msp3400 v4l2 set_stereo");
  45
  46         route.input = MSP_INPUT_DEFAULT;
  47         route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
  48         switch (hdw->input_val) {
  49         case PVR2_CVAL_INPUT_TV:
  50                 break;
  51         case PVR2_CVAL_INPUT_RADIO:
  52                 /* Assume that msp34xx also handle FM decoding, in which case
  53                    we're still using the tuner. */
  54                 /* HV: actually it is more likely to be the SCART2 input if
  55                    the ivtv experience is any indication. */
  56                 route.input = MSP_INPUT(MSP_IN_SCART2, MSP_IN_TUNER1,
  57                                     MSP_DSP_IN_SCART, MSP_DSP_IN_SCART);
  58                 break;
  59         case PVR2_CVAL_INPUT_SVIDEO:
  60         case PVR2_CVAL_INPUT_COMPOSITE:
  61                 /* SCART 1 input */
  62                 route.input = MSP_INPUT(MSP_IN_SCART1, MSP_IN_TUNER1,
  63                                     MSP_DSP_IN_SCART, MSP_DSP_IN_SCART);
  64                 break;
  65         }
  66         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_AUDIO_ROUTING,&route);
  67 }
  68
  69
  70 static int check_stereo(struct pvr2_msp3400_handler *ctxt)
  71 {
  72         struct pvr2_hdw *hdw = ctxt->hdw;
  73         return hdw->input_dirty;
  74 }
  75
  76
  77 struct pvr2_msp3400_ops {
  78         void (*update)(struct pvr2_msp3400_handler *);
  79         int (*check)(struct pvr2_msp3400_handler *);
  80 };
  81
  82
  83 static const struct pvr2_msp3400_ops msp3400_ops[] = {
  84         { .update = set_stereo, .check = check_stereo},
  85 };
  86
  87
  88 static int msp3400_check(struct pvr2_msp3400_handler *ctxt)
  89 {
  90         unsigned long msk;
  91         unsigned int idx;
  92
  93         for (idx = 0; idx < ARRAY_SIZE(msp3400_ops); idx++) {
  94                 msk = 1 << idx;
  95                 if (ctxt->stale_mask & msk) continue;
  96                 if (msp3400_ops[idx].check(ctxt)) {
  97                         ctxt->stale_mask |= msk;
  98                 }
  99         }
 100         return ctxt->stale_mask != 0;
 101 }
 102
 103
 104 static void msp3400_update(struct pvr2_msp3400_handler *ctxt)
 105 {
 106         unsigned long msk;
 107         unsigned int idx;
 108
 109         for (idx = 0; idx < ARRAY_SIZE(msp3400_ops); idx++) {
 110                 msk = 1 << idx;
 111                 if (!(ctxt->stale_mask & msk)) continue;
 112                 ctxt->stale_mask &= ~msk;
 113                 msp3400_ops[idx].update(ctxt);
 114         }
 115 }
 116
 117
 118 static void pvr2_msp3400_detach(struct pvr2_msp3400_handler *ctxt)
 119 {
 120         ctxt->client->handler = NULL;
 121         kfree(ctxt);
 122 }
 123
 124
 125 static unsigned int pvr2_msp3400_describe(struct pvr2_msp3400_handler *ctxt,
 126                                           char *buf,unsigned int cnt)
 127 {
 128         return scnprintf(buf,cnt,"handler: pvrusb2-audio v4l2");
 129 }
 130
 131
 132 static const struct pvr2_i2c_handler_functions msp3400_funcs = {
 133         .detach = (void (*)(void *))pvr2_msp3400_detach,
 134         .check = (int (*)(void *))msp3400_check,
 135         .update = (void (*)(void *))msp3400_update,
 136         .describe = (unsigned int (*)(void *,char *,unsigned int))pvr2_msp3400_describe,
 137 };
 138
 139
 140 int pvr2_i2c_msp3400_setup(struct pvr2_hdw *hdw,struct pvr2_i2c_client *cp)
 141 {
 142         struct pvr2_msp3400_handler *ctxt;
 143         if (cp->handler) return 0;
 144
 145         ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
 146         if (!ctxt) return 0;
 147
 148         ctxt->i2c_handler.func_data = ctxt;
 149         ctxt->i2c_handler.func_table = &msp3400_funcs;
 150         ctxt->client = cp;
 151         ctxt->hdw = hdw;
 152         ctxt->stale_mask = (1 << ARRAY_SIZE(msp3400_ops)) - 1;
 153         cp->handler = &ctxt->i2c_handler;
 154         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x msp3400 V4L2 handler set up",
 155                    cp->client->addr);
 156         return !0;
 157 }
 158
 159
 160 /*
 161   Stuff for Emacs to see, in order to encourage consistent editing style:
 162   *** Local Variables: ***
 163   *** mode: c ***
 164   *** fill-column: 70 ***
 165   *** tab-width: 8 ***
 166   *** c-basic-offset: 8 ***
 167   *** End: ***
 168   */