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/slab.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/export.h>
  26 #include <sound/core.h>
  27 #include "hda_beep.h"
  28 #include "hda_local.h"
  29
  30 enum {
  31         DIGBEEP_HZ_STEP = 46875,        /* 46.875 Hz */
  32         DIGBEEP_HZ_MIN = 93750,         /* 93.750 Hz */
  33         DIGBEEP_HZ_MAX = 12000000,      /* 12 KHz */
  34 };
  35
  36 static void snd_hda_generate_beep(struct work_struct *work)
  37 {
  38         struct hda_beep *beep =
  39                 container_of(work, struct hda_beep, beep_work);
  40         struct hda_codec *codec = beep->codec;
  41         int tone;
  42
  43         if (!beep->enabled)
  44                 return;
  45
  46         tone = beep->tone;
  47         if (tone && !beep->playing) {
  48                 snd_hda_power_up(codec);
  49                 beep->playing = 1;
  50         }
  51         /* generate tone */
  52         snd_hda_codec_write(codec, beep->nid, 0,
  53                             AC_VERB_SET_BEEP_CONTROL, tone);
  54         if (!tone && beep->playing) {
  55                 beep->playing = 0;
  56                 snd_hda_power_down(codec);
  57         }
  58 }
  59
  60 /* (non-standard) Linear beep tone calculation for IDT/STAC codecs
  61  *
  62  * The tone frequency of beep generator on IDT/STAC codecs is
  63  * defined from the 8bit tone parameter, in Hz,
  64  *    freq = 48000 * (257 - tone) / 1024
  65  * that is from 12kHz to 93.75Hz in steps of 46.875 Hz
  66  */
  67 static int beep_linear_tone(struct hda_beep *beep, int hz)
  68 {
  69         if (hz <= 0)
  70                 return 0;
  71         hz *= 1000; /* fixed point */
  72         hz = hz - DIGBEEP_HZ_MIN
  73                 + DIGBEEP_HZ_STEP / 2; /* round to nearest step */
  74         if (hz < 0)
  75                 hz = 0; /* turn off PC beep*/
  76         else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
  77                 hz = 1; /* max frequency */
  78         else {
  79                 hz /= DIGBEEP_HZ_STEP;
  80                 hz = 255 - hz;
  81         }
  82         return hz;
  83 }
  84
  85 /* HD-audio standard beep tone parameter calculation
  86  *
  87  * The tone frequency in Hz is calculated as
  88  *   freq = 48000 / (tone * 4)
  89  * from 47Hz to 12kHz
  90  */
  91 static int beep_standard_tone(struct hda_beep *beep, int hz)
  92 {
  93         if (hz <= 0)
  94                 return 0; /* disabled */
  95         hz = 12000 / hz;
  96         if (hz > 0xff)
  97                 return 0xff;
  98         if (hz <= 0)
  99                 return 1;
 100         return hz;
 101 }
 102
 103 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
 104                                 unsigned int code, int hz)
 105 {
 106         struct hda_beep *beep = input_get_drvdata(dev);
 107
 108         switch (code) {
 109         case SND_BELL:
 110                 if (hz)
 111                         hz = 1000;
 112                 /* fallthru */
 113         case SND_TONE:
 114                 if (beep->linear_tone)
 115                         beep->tone = beep_linear_tone(beep, hz);
 116                 else
 117                         beep->tone = beep_standard_tone(beep, hz);
 118                 break;
 119         default:
 120                 return -1;
 121         }
 122
 123         /* schedule beep event */
 124         schedule_work(&beep->beep_work);
 125         return 0;
 126 }
 127
 128 static void turn_off_beep(struct hda_beep *beep)
 129 {
 130         cancel_work_sync(&beep->beep_work);
 131         if (beep->playing) {
 132                 /* turn off beep */
 133                 snd_hda_codec_write(beep->codec, beep->nid, 0,
 134                                     AC_VERB_SET_BEEP_CONTROL, 0);
 135                 beep->playing = 0;
 136                 snd_hda_power_down(beep->codec);
 137         }
 138 }
 139
 140 static void snd_hda_do_detach(struct hda_beep *beep)
 141 {
 142         input_unregister_device(beep->dev);
 143         beep->dev = NULL;
 144         turn_off_beep(beep);
 145 }
 146
 147 static int snd_hda_do_attach(struct hda_beep *beep)
 148 {
 149         struct input_dev *input_dev;
 150         struct hda_codec *codec = beep->codec;
 151         int err;
 152
 153         input_dev = input_allocate_device();
 154         if (!input_dev)
 155                 return -ENOMEM;
 156
 157         /* setup digital beep device */
 158         input_dev->name = "HDA Digital PCBeep";
 159         input_dev->phys = beep->phys;
 160         input_dev->id.bustype = BUS_PCI;
 161
 162         input_dev->id.vendor = codec->vendor_id >> 16;
 163         input_dev->id.product = codec->vendor_id & 0xffff;
 164         input_dev->id.version = 0x01;
 165
 166         input_dev->evbit[0] = BIT_MASK(EV_SND);
 167         input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
 168         input_dev->event = snd_hda_beep_event;
 169         input_dev->dev.parent = codec->bus->card->dev;
 170         input_set_drvdata(input_dev, beep);
 171
 172         err = input_register_device(input_dev);
 173         if (err < 0) {
 174                 input_free_device(input_dev);
 175                 codec_err(codec, "hda_beep: unable to register input device\n");
 176                 return err;
 177         }
 178         beep->dev = input_dev;
 179         return 0;
 180 }
 181
 182 int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
 183 {
 184         struct hda_beep *beep = codec->beep;
 185         if (!beep)
 186                 return 0;
 187         enable = !!enable;
 188         if (beep->enabled != enable) {
 189                 beep->enabled = enable;
 190                 if (!enable)
 191                         turn_off_beep(beep);
 192                 return 1;
 193         }
 194         return 0;
 195 }
 196 EXPORT_SYMBOL_GPL(snd_hda_enable_beep_device);
 197
 198 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
 199 {
 200         struct hda_beep *beep;
 201         int err;
 202
 203         if (!snd_hda_get_bool_hint(codec, "beep"))
 204                 return 0; /* disabled explicitly by hints */
 205         if (codec->beep_mode == HDA_BEEP_MODE_OFF)
 206                 return 0; /* disabled by module option */
 207
 208         beep = kzalloc(sizeof(*beep), GFP_KERNEL);
 209         if (beep == NULL)
 210                 return -ENOMEM;
 211         snprintf(beep->phys, sizeof(beep->phys),
 212                 "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr);
 213         /* enable linear scale */
 214         snd_hda_codec_write_cache(codec, nid, 0,
 215                 AC_VERB_SET_DIGI_CONVERT_2, 0x01);
 216
 217         beep->nid = nid;
 218         beep->codec = codec;
 219         codec->beep = beep;
 220
 221         INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
 222         mutex_init(&beep->mutex);
 223
 224         err = snd_hda_do_attach(beep);
 225         if (err < 0) {
 226                 kfree(beep);
 227                 codec->beep = NULL;
 228                 return err;
 229         }
 230
 231         return 0;
 232 }
 233 EXPORT_SYMBOL_GPL(snd_hda_attach_beep_device);
 234
 235 void snd_hda_detach_beep_device(struct hda_codec *codec)
 236 {
 237         struct hda_beep *beep = codec->beep;
 238         if (beep) {
 239                 if (beep->dev)
 240                         snd_hda_do_detach(beep);
 241                 codec->beep = NULL;
 242                 kfree(beep);
 243         }
 244 }
 245 EXPORT_SYMBOL_GPL(snd_hda_detach_beep_device);
 246
 247 static bool ctl_has_mute(struct snd_kcontrol *kcontrol)
 248 {
 249         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 250         return query_amp_caps(codec, get_amp_nid(kcontrol),
 251                               get_amp_direction(kcontrol)) & AC_AMPCAP_MUTE;
 252 }
 253
 254 /* get/put callbacks for beep mute mixer switches */
 255 int snd_hda_mixer_amp_switch_get_beep(struct snd_kcontrol *kcontrol,
 256                                       struct snd_ctl_elem_value *ucontrol)
 257 {
 258         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 259         struct hda_beep *beep = codec->beep;
 260         if (beep && (!beep->enabled || !ctl_has_mute(kcontrol))) {
 261                 ucontrol->value.integer.value[0] =
 262                         ucontrol->value.integer.value[1] = beep->enabled;
 263                 return 0;
 264         }
 265         return snd_hda_mixer_amp_switch_get(kcontrol, ucontrol);
 266 }
 267 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_get_beep);
 268
 269 int snd_hda_mixer_amp_switch_put_beep(struct snd_kcontrol *kcontrol,
 270                                       struct snd_ctl_elem_value *ucontrol)
 271 {
 272         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 273         struct hda_beep *beep = codec->beep;
 274         if (beep) {
 275                 u8 chs = get_amp_channels(kcontrol);
 276                 int enable = 0;
 277                 long *valp = ucontrol->value.integer.value;
 278                 if (chs & 1) {
 279                         enable |= *valp;
 280                         valp++;
 281                 }
 282                 if (chs & 2)
 283                         enable |= *valp;
 284                 snd_hda_enable_beep_device(codec, enable);
 285         }
 286         if (!ctl_has_mute(kcontrol))
 287                 return 0;
 288         return snd_hda_mixer_amp_switch_put(kcontrol, ucontrol);
 289 }
 290 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_put_beep);