kernel/2.6.29.6-aldebaran-rt/drivers/media/video/pvrusb2/pvrusb2-tuner.c

   1 /*
   2  *
   3  *
   4  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   5  *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include "pvrusb2.h"
  23 #include "pvrusb2-util.h"
  24 #include "pvrusb2-tuner.h"
  25 #include "pvrusb2-hdw-internal.h"
  26 #include "pvrusb2-debug.h"
  27 #include <linux/videodev2.h>
  28 #include <media/tuner.h>
  29 #include <media/v4l2-common.h>
  30
  31 struct pvr2_tuner_handler {
  32         struct pvr2_hdw *hdw;
  33         struct pvr2_i2c_client *client;
  34         struct pvr2_i2c_handler i2c_handler;
  35         int type_update_fl;
  36 };
  37
  38
  39 static void set_type(struct pvr2_tuner_handler *ctxt)
  40 {
  41         struct pvr2_hdw *hdw = ctxt->hdw;
  42         struct tuner_setup setup;
  43         pvr2_trace(PVR2_TRACE_CHIPS,"i2c tuner set_type(%d)",hdw->tuner_type);
  44         if (((int)(hdw->tuner_type)) < 0) return;
  45
  46         setup.addr = ADDR_UNSET;
  47         setup.type = hdw->tuner_type;
  48         setup.mode_mask = T_RADIO | T_ANALOG_TV;
  49         /* We may really want mode_mask to be T_ANALOG_TV for now */
  50         pvr2_i2c_client_cmd(ctxt->client,TUNER_SET_TYPE_ADDR,&setup);
  51         ctxt->type_update_fl = 0;
  52 }
  53
  54
  55 static int tuner_check(struct pvr2_tuner_handler *ctxt)
  56 {
  57         struct pvr2_hdw *hdw = ctxt->hdw;
  58         if (hdw->tuner_updated) ctxt->type_update_fl = !0;
  59         return ctxt->type_update_fl != 0;
  60 }
  61
  62
  63 static void tuner_update(struct pvr2_tuner_handler *ctxt)
  64 {
  65         if (ctxt->type_update_fl) set_type(ctxt);
  66 }
  67
  68
  69 static void pvr2_tuner_detach(struct pvr2_tuner_handler *ctxt)
  70 {
  71         ctxt->client->handler = NULL;
  72         kfree(ctxt);
  73 }
  74
  75
  76 static unsigned int pvr2_tuner_describe(struct pvr2_tuner_handler *ctxt,char *buf,unsigned int cnt)
  77 {
  78         return scnprintf(buf,cnt,"handler: pvrusb2-tuner");
  79 }
  80
  81
  82 static const struct pvr2_i2c_handler_functions tuner_funcs = {
  83         .detach = (void (*)(void *))pvr2_tuner_detach,
  84         .check = (int (*)(void *))tuner_check,
  85         .update = (void (*)(void *))tuner_update,
  86         .describe = (unsigned int (*)(void *,char *,unsigned int))pvr2_tuner_describe,
  87 };
  88
  89
  90 int pvr2_i2c_tuner_setup(struct pvr2_hdw *hdw,struct pvr2_i2c_client *cp)
  91 {
  92         struct pvr2_tuner_handler *ctxt;
  93         if (cp->handler) return 0;
  94
  95         ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
  96         if (!ctxt) return 0;
  97
  98         ctxt->i2c_handler.func_data = ctxt;
  99         ctxt->i2c_handler.func_table = &tuner_funcs;
 100         ctxt->type_update_fl = !0;
 101         ctxt->client = cp;
 102         ctxt->hdw = hdw;
 103         cp->handler = &ctxt->i2c_handler;
 104         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x tuner handler set up",
 105                    cp->client->addr);
 106         return !0;
 107 }
 108
 109
 110
 111
 112 /*
 113   Stuff for Emacs to see, in order to encourage consistent editing style:
 114   *** Local Variables: ***
 115   *** mode: c ***
 116   *** fill-column: 70 ***
 117   *** tab-width: 8 ***
 118   *** c-basic-offset: 8 ***
 119   *** End: ***
 120   */