drivers/media/video/pvrusb2/pvrusb2-tuner.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.h"
  24 #include "pvrusb2-util.h"
  25 #include "pvrusb2-tuner.h"
  26 #include "pvrusb2-hdw-internal.h"
  27 #include "pvrusb2-debug.h"
  28 #include <linux/videodev2.h>
  29 #include <media/tuner.h>
  30 #include <media/v4l2-common.h>
  31
  32 struct pvr2_tuner_handler {
  33         struct pvr2_hdw *hdw;
  34         struct pvr2_i2c_client *client;
  35         struct pvr2_i2c_handler i2c_handler;
  36         int type_update_fl;
  37 };
  38
  39
  40 static void set_type(struct pvr2_tuner_handler *ctxt)
  41 {
  42         struct pvr2_hdw *hdw = ctxt->hdw;
  43         struct tuner_setup setup;
  44         pvr2_trace(PVR2_TRACE_CHIPS,"i2c tuner set_type(%d)",hdw->tuner_type);
  45         if (((int)(hdw->tuner_type)) < 0) return;
  46
  47         setup.addr = ADDR_UNSET;
  48         setup.type = hdw->tuner_type;
  49         setup.mode_mask = T_RADIO | T_ANALOG_TV;
  50         /* We may really want mode_mask to be T_ANALOG_TV for now */
  51         pvr2_i2c_client_cmd(ctxt->client,TUNER_SET_TYPE_ADDR,&setup);
  52         ctxt->type_update_fl = 0;
  53 }
  54
  55
  56 static int tuner_check(struct pvr2_tuner_handler *ctxt)
  57 {
  58         struct pvr2_hdw *hdw = ctxt->hdw;
  59         if (hdw->tuner_updated) ctxt->type_update_fl = !0;
  60         return ctxt->type_update_fl != 0;
  61 }
  62
  63
  64 static void tuner_update(struct pvr2_tuner_handler *ctxt)
  65 {
  66         if (ctxt->type_update_fl) set_type(ctxt);
  67 }
  68
  69
  70 static void pvr2_tuner_detach(struct pvr2_tuner_handler *ctxt)
  71 {
  72         ctxt->client->handler = NULL;
  73         kfree(ctxt);
  74 }
  75
  76
  77 static unsigned int pvr2_tuner_describe(struct pvr2_tuner_handler *ctxt,char *buf,unsigned int cnt)
  78 {
  79         return scnprintf(buf,cnt,"handler: pvrusb2-tuner");
  80 }
  81
  82
  83 static const struct pvr2_i2c_handler_functions tuner_funcs = {
  84         .detach = (void (*)(void *))pvr2_tuner_detach,
  85         .check = (int (*)(void *))tuner_check,
  86         .update = (void (*)(void *))tuner_update,
  87         .describe = (unsigned int (*)(void *,char *,unsigned int))pvr2_tuner_describe,
  88 };
  89
  90
  91 int pvr2_i2c_tuner_setup(struct pvr2_hdw *hdw,struct pvr2_i2c_client *cp)
  92 {
  93         struct pvr2_tuner_handler *ctxt;
  94         if (cp->handler) return 0;
  95
  96         ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
  97         if (!ctxt) return 0;
  98
  99         ctxt->i2c_handler.func_data = ctxt;
 100         ctxt->i2c_handler.func_table = &tuner_funcs;
 101         ctxt->type_update_fl = !0;
 102         ctxt->client = cp;
 103         ctxt->hdw = hdw;
 104         cp->handler = &ctxt->i2c_handler;
 105         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x tuner handler set up",
 106                    cp->client->addr);
 107         return !0;
 108 }
 109
 110
 111
 112
 113 /*
 114   Stuff for Emacs to see, in order to encourage consistent editing style:
 115   *** Local Variables: ***
 116   *** mode: c ***
 117   *** fill-column: 70 ***
 118   *** tab-width: 8 ***
 119   *** c-basic-offset: 8 ***
 120   *** End: ***
 121   */