drivers/media/video/pvrusb2/pvrusb2-wm8775.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    wm8775.
  27
  28 */
  29
  30 #include "pvrusb2-wm8775.h"
  31 #include "pvrusb2-i2c-cmd-v4l2.h"
  32
  33
  34 #include "pvrusb2-hdw-internal.h"
  35 #include "pvrusb2-debug.h"
  36 #include <linux/videodev2.h>
  37 #include <media/v4l2-common.h>
  38 #include <linux/errno.h>
  39 #include <linux/slab.h>
  40
  41 struct pvr2_v4l_wm8775 {
  42         struct pvr2_i2c_handler handler;
  43         struct pvr2_i2c_client *client;
  44         struct pvr2_hdw *hdw;
  45         unsigned long stale_mask;
  46 };
  47
  48
  49 static void set_input(struct pvr2_v4l_wm8775 *ctxt)
  50 {
  51         struct v4l2_routing route;
  52         struct pvr2_hdw *hdw = ctxt->hdw;
  53
  54         memset(&route,0,sizeof(route));
  55
  56         switch(hdw->input_val) {
  57         case PVR2_CVAL_INPUT_RADIO:
  58                 route.input = 1;
  59                 break;
  60         default:
  61                 /* All other cases just use the second input */
  62                 route.input = 2;
  63                 break;
  64         }
  65         pvr2_trace(PVR2_TRACE_CHIPS,"i2c wm8775 set_input(val=%d route=0x%x)",
  66                    hdw->input_val,route.input);
  67
  68         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_AUDIO_ROUTING,&route);
  69 }
  70
  71 static int check_input(struct pvr2_v4l_wm8775 *ctxt)
  72 {
  73         struct pvr2_hdw *hdw = ctxt->hdw;
  74         return hdw->input_dirty != 0;
  75 }
  76
  77
  78 struct pvr2_v4l_wm8775_ops {
  79         void (*update)(struct pvr2_v4l_wm8775 *);
  80         int (*check)(struct pvr2_v4l_wm8775 *);
  81 };
  82
  83
  84 static const struct pvr2_v4l_wm8775_ops wm8775_ops[] = {
  85         { .update = set_input, .check = check_input},
  86 };
  87
  88
  89 static unsigned int wm8775_describe(struct pvr2_v4l_wm8775 *ctxt,
  90                                      char *buf,unsigned int cnt)
  91 {
  92         return scnprintf(buf,cnt,"handler: pvrusb2-wm8775");
  93 }
  94
  95
  96 static void wm8775_detach(struct pvr2_v4l_wm8775 *ctxt)
  97 {
  98         ctxt->client->handler = NULL;
  99         kfree(ctxt);
 100 }
 101
 102
 103 static int wm8775_check(struct pvr2_v4l_wm8775 *ctxt)
 104 {
 105         unsigned long msk;
 106         unsigned int idx;
 107
 108         for (idx = 0; idx < ARRAY_SIZE(wm8775_ops); idx++) {
 109                 msk = 1 << idx;
 110                 if (ctxt->stale_mask & msk) continue;
 111                 if (wm8775_ops[idx].check(ctxt)) {
 112                         ctxt->stale_mask |= msk;
 113                 }
 114         }
 115         return ctxt->stale_mask != 0;
 116 }
 117
 118
 119 static void wm8775_update(struct pvr2_v4l_wm8775 *ctxt)
 120 {
 121         unsigned long msk;
 122         unsigned int idx;
 123
 124         for (idx = 0; idx < ARRAY_SIZE(wm8775_ops); idx++) {
 125                 msk = 1 << idx;
 126                 if (!(ctxt->stale_mask & msk)) continue;
 127                 ctxt->stale_mask &= ~msk;
 128                 wm8775_ops[idx].update(ctxt);
 129         }
 130 }
 131
 132
 133 static const struct pvr2_i2c_handler_functions hfuncs = {
 134         .detach = (void (*)(void *))wm8775_detach,
 135         .check = (int (*)(void *))wm8775_check,
 136         .update = (void (*)(void *))wm8775_update,
 137         .describe = (unsigned int (*)(void *,char *,unsigned int))wm8775_describe,
 138 };
 139
 140
 141 int pvr2_i2c_wm8775_setup(struct pvr2_hdw *hdw,struct pvr2_i2c_client *cp)
 142 {
 143         struct pvr2_v4l_wm8775 *ctxt;
 144
 145         if (cp->handler) return 0;
 146
 147         ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
 148         if (!ctxt) return 0;
 149
 150         ctxt->handler.func_data = ctxt;
 151         ctxt->handler.func_table = &hfuncs;
 152         ctxt->client = cp;
 153         ctxt->hdw = hdw;
 154         ctxt->stale_mask = (1 << ARRAY_SIZE(wm8775_ops)) - 1;
 155         cp->handler = &ctxt->handler;
 156         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x wm8775 V4L2 handler set up",
 157                    cp->client->addr);
 158         return !0;
 159 }
 160
 161
 162
 163
 164 /*
 165   Stuff for Emacs to see, in order to encourage consistent editing style:
 166   *** Local Variables: ***
 167   *** mode: c ***
 168   *** fill-column: 70 ***
 169   *** tab-width: 8 ***
 170   *** c-basic-offset: 8 ***
 171   *** End: ***
 172   */