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         int msk = 0;
  54
  55         memset(&route,0,sizeof(route));
  56
  57         pvr2_trace(PVR2_TRACE_CHIPS,"i2c wm8775 set_input(val=%d msk=0x%x)",
  58                    hdw->input_val,msk);
  59
  60         // Always point to input #1 no matter what
  61         route.input = 2;
  62         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_AUDIO_ROUTING,&route);
  63 }
  64
  65 static int check_input(struct pvr2_v4l_wm8775 *ctxt)
  66 {
  67         struct pvr2_hdw *hdw = ctxt->hdw;
  68         return hdw->input_dirty != 0;
  69 }
  70
  71
  72 struct pvr2_v4l_wm8775_ops {
  73         void (*update)(struct pvr2_v4l_wm8775 *);
  74         int (*check)(struct pvr2_v4l_wm8775 *);
  75 };
  76
  77
  78 static const struct pvr2_v4l_wm8775_ops wm8775_ops[] = {
  79         { .update = set_input, .check = check_input},
  80 };
  81
  82
  83 static unsigned int wm8775_describe(struct pvr2_v4l_wm8775 *ctxt,
  84                                      char *buf,unsigned int cnt)
  85 {
  86         return scnprintf(buf,cnt,"handler: pvrusb2-wm8775");
  87 }
  88
  89
  90 static void wm8775_detach(struct pvr2_v4l_wm8775 *ctxt)
  91 {
  92         ctxt->client->handler = NULL;
  93         kfree(ctxt);
  94 }
  95
  96
  97 static int wm8775_check(struct pvr2_v4l_wm8775 *ctxt)
  98 {
  99         unsigned long msk;
 100         unsigned int idx;
 101
 102         for (idx = 0; idx < sizeof(wm8775_ops)/sizeof(wm8775_ops[0]);
 103              idx++) {
 104                 msk = 1 << idx;
 105                 if (ctxt->stale_mask & msk) continue;
 106                 if (wm8775_ops[idx].check(ctxt)) {
 107                         ctxt->stale_mask |= msk;
 108                 }
 109         }
 110         return ctxt->stale_mask != 0;
 111 }
 112
 113
 114 static void wm8775_update(struct pvr2_v4l_wm8775 *ctxt)
 115 {
 116         unsigned long msk;
 117         unsigned int idx;
 118
 119         for (idx = 0; idx < sizeof(wm8775_ops)/sizeof(wm8775_ops[0]);
 120              idx++) {
 121                 msk = 1 << idx;
 122                 if (!(ctxt->stale_mask & msk)) continue;
 123                 ctxt->stale_mask &= ~msk;
 124                 wm8775_ops[idx].update(ctxt);
 125         }
 126 }
 127
 128
 129 static const struct pvr2_i2c_handler_functions hfuncs = {
 130         .detach = (void (*)(void *))wm8775_detach,
 131         .check = (int (*)(void *))wm8775_check,
 132         .update = (void (*)(void *))wm8775_update,
 133         .describe = (unsigned int (*)(void *,char *,unsigned int))wm8775_describe,
 134 };
 135
 136
 137 int pvr2_i2c_wm8775_setup(struct pvr2_hdw *hdw,struct pvr2_i2c_client *cp)
 138 {
 139         struct pvr2_v4l_wm8775 *ctxt;
 140
 141         if (cp->handler) return 0;
 142
 143         ctxt = kmalloc(sizeof(*ctxt),GFP_KERNEL);
 144         if (!ctxt) return 0;
 145         memset(ctxt,0,sizeof(*ctxt));
 146
 147         ctxt->handler.func_data = ctxt;
 148         ctxt->handler.func_table = &hfuncs;
 149         ctxt->client = cp;
 150         ctxt->hdw = hdw;
 151         ctxt->stale_mask = (1 << (sizeof(wm8775_ops)/
 152                                   sizeof(wm8775_ops[0]))) - 1;
 153         cp->handler = &ctxt->handler;
 154         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x wm8775 V4L2 handler set up",
 155                    cp->client->addr);
 156         return !0;
 157 }
 158
 159
 160
 161
 162 /*
 163   Stuff for Emacs to see, in order to encourage consistent editing style:
 164   *** Local Variables: ***
 165   *** mode: c ***
 166   *** fill-column: 70 ***
 167   *** tab-width: 8 ***
 168   *** c-basic-offset: 8 ***
 169   *** End: ***
 170   */