drivers/media/video/pvrusb2/pvrusb2-wm8775.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 /*
  23
  24    This source file is specifically designed to interface with the
  25    wm8775.
  26
  27 */
  28
  29 #include "pvrusb2-wm8775.h"
  30 #include "pvrusb2-i2c-cmd-v4l2.h"
  31
  32
  33 #include "pvrusb2-hdw-internal.h"
  34 #include "pvrusb2-debug.h"
  35 #include <linux/videodev2.h>
  36 #include <media/v4l2-common.h>
  37 #include <linux/errno.h>
  38 #include <linux/slab.h>
  39
  40 struct pvr2_v4l_wm8775 {
  41         struct pvr2_i2c_handler handler;
  42         struct pvr2_i2c_client *client;
  43         struct pvr2_hdw *hdw;
  44         unsigned long stale_mask;
  45 };
  46
  47
  48 static void set_input(struct pvr2_v4l_wm8775 *ctxt)
  49 {
  50         struct v4l2_routing route;
  51         struct pvr2_hdw *hdw = ctxt->hdw;
  52
  53         memset(&route,0,sizeof(route));
  54
  55         switch(hdw->input_val) {
  56         case PVR2_CVAL_INPUT_RADIO:
  57                 route.input = 1;
  58                 break;
  59         default:
  60                 /* All other cases just use the second input */
  61                 route.input = 2;
  62                 break;
  63         }
  64         pvr2_trace(PVR2_TRACE_CHIPS,"i2c wm8775 set_input(val=%d route=0x%x)",
  65                    hdw->input_val,route.input);
  66
  67         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_AUDIO_ROUTING,&route);
  68 }
  69
  70 static int check_input(struct pvr2_v4l_wm8775 *ctxt)
  71 {
  72         struct pvr2_hdw *hdw = ctxt->hdw;
  73         return hdw->input_dirty != 0;
  74 }
  75
  76
  77 struct pvr2_v4l_wm8775_ops {
  78         void (*update)(struct pvr2_v4l_wm8775 *);
  79         int (*check)(struct pvr2_v4l_wm8775 *);
  80 };
  81
  82
  83 static const struct pvr2_v4l_wm8775_ops wm8775_ops[] = {
  84         { .update = set_input, .check = check_input},
  85 };
  86
  87
  88 static unsigned int wm8775_describe(struct pvr2_v4l_wm8775 *ctxt,
  89                                      char *buf,unsigned int cnt)
  90 {
  91         return scnprintf(buf,cnt,"handler: pvrusb2-wm8775");
  92 }
  93
  94
  95 static void wm8775_detach(struct pvr2_v4l_wm8775 *ctxt)
  96 {
  97         ctxt->client->handler = NULL;
  98         kfree(ctxt);
  99 }
 100
 101
 102 static int wm8775_check(struct pvr2_v4l_wm8775 *ctxt)
 103 {
 104         unsigned long msk;
 105         unsigned int idx;
 106
 107         for (idx = 0; idx < ARRAY_SIZE(wm8775_ops); idx++) {
 108                 msk = 1 << idx;
 109                 if (ctxt->stale_mask & msk) continue;
 110                 if (wm8775_ops[idx].check(ctxt)) {
 111                         ctxt->stale_mask |= msk;
 112                 }
 113         }
 114         return ctxt->stale_mask != 0;
 115 }
 116
 117
 118 static void wm8775_update(struct pvr2_v4l_wm8775 *ctxt)
 119 {
 120         unsigned long msk;
 121         unsigned int idx;
 122
 123         for (idx = 0; idx < ARRAY_SIZE(wm8775_ops); idx++) {
 124                 msk = 1 << idx;
 125                 if (!(ctxt->stale_mask & msk)) continue;
 126                 ctxt->stale_mask &= ~msk;
 127                 wm8775_ops[idx].update(ctxt);
 128         }
 129 }
 130
 131
 132 static const struct pvr2_i2c_handler_functions hfuncs = {
 133         .detach = (void (*)(void *))wm8775_detach,
 134         .check = (int (*)(void *))wm8775_check,
 135         .update = (void (*)(void *))wm8775_update,
 136         .describe = (unsigned int (*)(void *,char *,unsigned int))wm8775_describe,
 137 };
 138
 139
 140 int pvr2_i2c_wm8775_setup(struct pvr2_hdw *hdw,struct pvr2_i2c_client *cp)
 141 {
 142         struct pvr2_v4l_wm8775 *ctxt;
 143
 144         if (cp->handler) return 0;
 145
 146         ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
 147         if (!ctxt) return 0;
 148
 149         ctxt->handler.func_data = ctxt;
 150         ctxt->handler.func_table = &hfuncs;
 151         ctxt->client = cp;
 152         ctxt->hdw = hdw;
 153         ctxt->stale_mask = (1 << ARRAY_SIZE(wm8775_ops)) - 1;
 154         cp->handler = &ctxt->handler;
 155         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x wm8775 V4L2 handler set up",
 156                    cp->client->addr);
 157         return !0;
 158 }
 159
 160
 161
 162
 163 /*
 164   Stuff for Emacs to see, in order to encourage consistent editing style:
 165   *** Local Variables: ***
 166   *** mode: c ***
 167   *** fill-column: 70 ***
 168   *** tab-width: 8 ***
 169   *** c-basic-offset: 8 ***
 170   *** End: ***
 171   */