text: /*
   *
   *  $Id$
   *
   *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software
   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   *
   */
  
  /*
  
     This source file is specifically designed to interface with the
     wm8775.
  
  */
  
  #include "pvrusb2-wm8775.h"
  #include "pvrusb2-i2c-cmd-v4l2.h"
  
  
  #include "pvrusb2-hdw-internal.h"
  #include "pvrusb2-debug.h"
  #include <linux/videodev2.h>
  #include <media/v4l2-common.h>
  #include <linux/errno.h>
  #include <linux/slab.h>
  
  struct pvr2_v4l_wm8775 {
  	struct pvr2_i2c_handler handler;
  	struct pvr2_i2c_client *client;
  	struct pvr2_hdw *hdw;
  	unsigned long stale_mask;
  };
  
  
  static void set_input(struct pvr2_v4l_wm8775 *ctxt)
  {
  	struct v4l2_routing route;
  	struct pvr2_hdw *hdw = ctxt->hdw;
  
  	memset(&route,0,sizeof(route));
  
  	switch(hdw->input_val) {
  	case PVR2_CVAL_INPUT_RADIO:
  		route.input = 1;
  		break;
  	default:
  		/* All other cases just use the second input */
  		route.input = 2;
  		break;
  	}
  	pvr2_trace(PVR2_TRACE_CHIPS,"i2c wm8775 set_input(val=%d route=0x%x)",
  		   hdw->input_val,route.input);
  
  	pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_AUDIO_ROUTING,&route);
  }
  
  static int check_input(struct pvr2_v4l_wm8775 *ctxt)
  {
  	struct pvr2_hdw *hdw = ctxt->hdw;
  	return hdw->input_dirty != 0;
  }
  
  
  struct pvr2_v4l_wm8775_ops {
  	void (*update)(struct pvr2_v4l_wm8775 *);
  	int (*check)(struct pvr2_v4l_wm8775 *);
  };
  
  
  static const struct pvr2_v4l_wm8775_ops wm8775_ops[] = {
  	{ .update = set_input, .check = check_input},
  };
  
  
  static unsigned int wm8775_describe(struct pvr2_v4l_wm8775 *ctxt,
  				     char *buf,unsigned int cnt)
  {
  	return scnprintf(buf,cnt,"handler: pvrusb2-wm8775");
  }
  
  
  static void wm8775_detach(struct pvr2_v4l_wm8775 *ctxt)
  {
  	ctxt->client->handler = NULL;
  	kfree(ctxt);
  }
  
  
  static int wm8775_check(struct pvr2_v4l_wm8775 *ctxt)
  {
  	unsigned long msk;
  	unsigned int idx;
  
  	for (idx = 0; idx < ARRAY_SIZE(wm8775_ops); idx++) {
  		msk = 1 << idx;
  		if (ctxt->stale_mask & msk) continue;
  		if (wm8775_ops[idx].check(ctxt)) {
  			ctxt->stale_mask |= msk;
  		}
  	}
  	return ctxt->stale_mask != 0;
  }
  
  
  static void wm8775_update(struct pvr2_v4l_wm8775 *ctxt)
  {
  	unsigned long msk;
  	unsigned int idx;
  
  	for (idx = 0; idx < ARRAY_SIZE(wm8775_ops); idx++) {
  		msk = 1 << idx;
  		if (!(ctxt->stale_mask & msk)) continue;
  		ctxt->stale_mask &= ~msk;
  		wm8775_ops[idx].update(ctxt);
  	}
  }
  
  
  static const struct pvr2_i2c_handler_functions hfuncs = {
  	.detach = (void (*)(void *))wm8775_detach,
  	.check = (int (*)(void *))wm8775_check,
  	.update = (void (*)(void *))wm8775_update,
  	.describe = (unsigned int (*)(void *,char *,unsigned int))wm8775_describe,
  };
  
  
  int pvr2_i2c_wm8775_setup(struct pvr2_hdw *hdw,struct pvr2_i2c_client *cp)
  {
  	struct pvr2_v4l_wm8775 *ctxt;
  
  	if (cp->handler) return 0;
  
  	ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
  	if (!ctxt) return 0;
  
  	ctxt->handler.func_data = ctxt;
  	ctxt->handler.func_table = &hfuncs;
  	ctxt->client = cp;
  	ctxt->hdw = hdw;
  	ctxt->stale_mask = (1 << ARRAY_SIZE(wm8775_ops)) - 1;
  	cp->handler = &ctxt->handler;
  	pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x wm8775 V4L2 handler set up",
  		   cp->client->addr);
  	return !0;
  }
  
  
  
  
  /*
    Stuff for Emacs to see, in order to encourage consistent editing style:
    *** Local Variables: ***
    *** mode: c ***
    *** fill-column: 70 ***
    *** tab-width: 8 ***
    *** c-basic-offset: 8 ***
    *** End: ***
    */
  