sound/pci/ice1712/amp.c

   1 /*
   2  *   ALSA driver for ICEnsemble VT1724 (Envy24HT)
   3  *
   4  *   Lowlevel functions for Advanced Micro Peripherals Ltd AUDIO2000
   5  *
   6  *      Copyright (c) 2000 Jaroslav Kysela <perex@suse.cz>
   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, or
  11  *   (at your option) any later version.
  12  *
  13  *   This program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program; if not, write to the Free Software
  20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  *
  22  */
  23
  24 #include <sound/driver.h>
  25 #include <asm/io.h>
  26 #include <linux/delay.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <sound/core.h>
  31
  32 #include "ice1712.h"
  33 #include "amp.h"
  34
  35
  36 static int __devinit snd_vt1724_amp_init(ice1712_t *ice)
  37 {
  38         /* only use basic functionality for now */
  39
  40         ice->num_total_dacs = 2;        /* only PSDOUT0 is connected */
  41
  42         return 0;
  43 }
  44
  45 static int __devinit snd_vt1724_amp_add_controls(ice1712_t *ice)
  46 {
  47         /* we use pins 39 and 41 of the VT1616 for left and right read outputs */
  48         snd_ac97_write_cache(ice->ac97, 0x5a, snd_ac97_read(ice->ac97, 0x5a) & ~0x8000);
  49         return 0;
  50 }
  51
  52
  53 /* entry point */
  54 struct snd_ice1712_card_info snd_vt1724_amp_cards[] __devinitdata = {
  55         {
  56                 VT1724_SUBDEVICE_AUDIO2000,
  57                 "AMP Ltd AUDIO2000",
  58                 snd_vt1724_amp_init,
  59                 snd_vt1724_amp_add_controls,
  60         },
  61         { } /* terminator */
  62 };
  63