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
  41
  42 struct pvr2_v4l_wm8775 {
  43         struct pvr2_i2c_handler handler;
  44         struct pvr2_i2c_client *client;
  45         struct pvr2_hdw *hdw;
  46         unsigned long stale_mask;
  47 };
  48
  49
  50 static void set_input(struct pvr2_v4l_wm8775 *ctxt)
  51 {
  52         struct v4l2_routing route;
  53         struct pvr2_hdw *hdw = ctxt->hdw;
  54
  55         memset(&route,0,sizeof(route));
  56
  57         switch(hdw->input_val) {
  58         case PVR2_CVAL_INPUT_RADIO:
  59                 route.input = 1;
  60                 break;
  61         default:
  62                 /* All other cases just use the second input */
  63                 route.input = 2;
  64                 break;
  65         }
  66         pvr2_trace(PVR2_TRACE_CHIPS,"i2c wm8775 set_input(val=%d route=0x%x)",
  67                    hdw->input_val,route.input);
  68
  69         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_AUDIO_ROUTING,&route);
  70 }
  71
  72 static int check_input(struct pvr2_v4l_wm8775 *ctxt)
  73 {
  74         struct pvr2_hdw *hdw = ctxt->hdw;
  75         return hdw->input_dirty != 0;
  76 }
  77
  78
  79 struct pvr2_v4l_wm8775_ops {
  80         void (*update)(struct pvr2_v4l_wm8775 *);
  81         int (*check)(struct pvr2_v4l_wm8775 *);
  82 };
  83
  84
  85 static const struct pvr2_v4l_wm8775_ops wm8775_ops[] = {
  86         { .update = set_input, .check = check_input},
  87 };
  88
  89
  90 static unsigned int wm8775_describe(struct pvr2_v4l_wm8775 *ctxt,
  91                                      char *buf,unsigned int cnt)
  92 {
  93         return scnprintf(buf,cnt,"handler: pvrusb2-wm8775");
  94 }
  95
  96
  97 static void wm8775_detach(struct pvr2_v4l_wm8775 *ctxt)
  98 {
  99         ctxt->client->handler = NULL;
 100         kfree(ctxt);
 101 }
 102
 103
 104 static int wm8775_check(struct pvr2_v4l_wm8775 *ctxt)
 105 {
 106         unsigned long msk;
 107         unsigned int idx;
 108
 109         for (idx = 0; idx < ARRAY_SIZE(wm8775_ops); idx++) {
 110                 msk = 1 << idx;
 111                 if (ctxt->stale_mask & msk) continue;
 112                 if (wm8775_ops[idx].check(ctxt)) {
 113                         ctxt->stale_mask |= msk;
 114                 }
 115         }
 116         return ctxt->stale_mask != 0;
 117 }
 118
 119
 120 static void wm8775_update(struct pvr2_v4l_wm8775 *ctxt)
 121 {
 122         unsigned long msk;
 123         unsigned int idx;
 124
 125         for (idx = 0; idx < ARRAY_SIZE(wm8775_ops); idx++) {
 126                 msk = 1 << idx;
 127                 if (!(ctxt->stale_mask & msk)) continue;
 128                 ctxt->stale_mask &= ~msk;
 129                 wm8775_ops[idx].update(ctxt);
 130         }
 131 }
 132
 133
 134 static const struct pvr2_i2c_handler_functions hfuncs = {
 135         .detach = (void (*)(void *))wm8775_detach,
 136         .check = (int (*)(void *))wm8775_check,
 137         .update = (void (*)(void *))wm8775_update,
 138         .describe = (unsigned int (*)(void *,char *,unsigned int))wm8775_describe,
 139 };
 140
 141
 142 int pvr2_i2c_wm8775_setup(struct pvr2_hdw *hdw,struct pvr2_i2c_client *cp)
 143 {
 144         struct pvr2_v4l_wm8775 *ctxt;
 145
 146         if (cp->handler) return 0;
 147
 148         ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
 149         if (!ctxt) return 0;
 150
 151         ctxt->handler.func_data = ctxt;
 152         ctxt->handler.func_table = &hfuncs;
 153         ctxt->client = cp;
 154         ctxt->hdw = hdw;
 155         ctxt->stale_mask = (1 << ARRAY_SIZE(wm8775_ops)) - 1;
 156         cp->handler = &ctxt->handler;
 157         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x wm8775 V4L2 handler set up",
 158                    cp->client->addr);
 159         return !0;
 160 }
 161
 162
 163 void pvr2_wm8775_subdev_update(struct pvr2_hdw *hdw, struct v4l2_subdev *sd)
 164 {
 165         if (hdw->input_dirty) {
 166                 struct v4l2_routing route;
 167
 168                 memset(&route, 0, sizeof(route));
 169
 170                 switch (hdw->input_val) {
 171                 case PVR2_CVAL_INPUT_RADIO:
 172                         route.input = 1;
 173                         break;
 174                 default:
 175                         /* All other cases just use the second input */
 176                         route.input = 2;
 177                         break;
 178                 }
 179                 pvr2_trace(PVR2_TRACE_CHIPS, "subdev wm8775"
 180                            " set_input(val=%d route=0x%x)",
 181                            hdw->input_val, route.input);
 182
 183                 sd->ops->audio->s_routing(sd, &route);
 184         }
 185 }
 186
 187
 188
 189 /*
 190   Stuff for Emacs to see, in order to encourage consistent editing style:
 191   *** Local Variables: ***
 192   *** mode: c ***
 193   *** fill-column: 70 ***
 194   *** tab-width: 8 ***
 195   *** c-basic-offset: 8 ***
 196   *** End: ***
 197   */