SAFE public projects git trees. - safe/jmp/linux-2.6/blob - sound/pci/hda/hda_beep.c

   1 /*
   2  * Digital Beep Input Interface for HD-audio codec
   3  *
   4  * Author: Matthew Ranostay <mranostay@embeddedalley.com>
   5  * Copyright (c) 2008 Embedded Alley Solutions Inc
   6  *
   7  *  This driver 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, or
  10  *  (at your option) any later version.
  11  *
  12  *  This driver 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 #include <linux/input.h>
  23 #include <linux/pci.h>
  24 #include <linux/workqueue.h>
  25 #include <sound/core.h>
  26 #include "hda_beep.h"
  27
  28 enum {
  29         DIGBEEP_HZ_STEP = 46875,        /* 46.875 Hz */
  30         DIGBEEP_HZ_MIN = 93750,         /* 93.750 Hz */
  31         DIGBEEP_HZ_MAX = 12000000,      /* 12 KHz */
  32 };
  33
  34 static void snd_hda_generate_beep(struct work_struct *work)
  35 {
  36         struct hda_beep *beep =
  37                 container_of(work, struct hda_beep, beep_work);
  38         struct hda_codec *codec = beep->codec;
  39
  40         /* generate tone */
  41         snd_hda_codec_write_cache(codec, beep->nid, 0,
  42                         AC_VERB_SET_BEEP_CONTROL, beep->tone);
  43 }
  44
  45 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
  46                                 unsigned int code, int hz)
  47 {
  48         struct hda_beep *beep = input_get_drvdata(dev);
  49
  50         switch (code) {
  51         case SND_BELL:
  52                 if (hz)
  53                         hz = 1000;
  54         case SND_TONE:
  55                 hz *= 1000; /* fixed point */
  56                 hz = hz - DIGBEEP_HZ_MIN;
  57                 if (hz < 0)
  58                         hz = 0; /* turn off PC beep*/
  59                 else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
  60                         hz = 0xff;
  61                 else {
  62                         hz /= DIGBEEP_HZ_STEP;
  63                         hz++;
  64                 }
  65                 break;
  66         default:
  67                 return -1;
  68         }
  69         beep->tone = hz;
  70
  71         /* schedule beep event */
  72         schedule_work(&beep->beep_work);
  73         return 0;
  74 }
  75
  76 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
  77 {
  78         struct input_dev *input_dev;
  79         struct hda_beep *beep;
  80         int err;
  81
  82         beep = kzalloc(sizeof(*beep), GFP_KERNEL);
  83         if (beep == NULL)
  84                 return -ENOMEM;
  85         snprintf(beep->phys, sizeof(beep->phys),
  86                 "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr);
  87         input_dev = input_allocate_device();
  88
  89         /* setup digital beep device */
  90         input_dev->name = "HDA Digital PCBeep";
  91         input_dev->phys = beep->phys;
  92         input_dev->id.bustype = BUS_PCI;
  93
  94         input_dev->id.vendor = codec->vendor_id >> 16;
  95         input_dev->id.product = codec->vendor_id & 0xffff;
  96         input_dev->id.version = 0x01;
  97
  98         input_dev->evbit[0] = BIT_MASK(EV_SND);
  99         input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
 100         input_dev->event = snd_hda_beep_event;
 101         input_dev->dev.parent = &codec->bus->pci->dev;
 102         input_set_drvdata(input_dev, beep);
 103
 104         err = input_register_device(input_dev);
 105         if (err < 0) {
 106                 kfree(input_dev);
 107                 kfree(beep);
 108                 return err;
 109         }
 110
 111         /* enable linear scale */
 112         snd_hda_codec_write(codec, nid, 0,
 113                 AC_VERB_SET_DIGI_CONVERT_2, 0x01);
 114
 115         beep->nid = nid;
 116         beep->dev = input_dev;
 117         beep->codec = codec;
 118         codec->beep = beep;
 119
 120         INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
 121         return 0;
 122 }
 123
 124 void snd_hda_detach_beep_device(struct hda_codec *codec)
 125 {
 126         struct hda_beep *beep = codec->beep;
 127         if (beep) {
 128                 cancel_work_sync(&beep->beep_work);
 129                 flush_scheduled_work();
 130
 131                 input_unregister_device(beep->dev);
 132                 kfree(beep);
 133         }
 134 }