kernel/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 /* generate or stop tone */
  37 static void generate_tone(struct hda_beep *beep, int tone)
  38 {
  39         struct hda_codec *codec = beep->codec;
  40
  41         if (tone && !beep->playing) {
  42                 snd_hda_power_up(codec);
  43                 if (beep->power_hook)
  44                         beep->power_hook(beep, true);
  45                 beep->playing = 1;
  46         }
  47         snd_hda_codec_write(codec, beep->nid, 0,
  48                             AC_VERB_SET_BEEP_CONTROL, tone);
  49         if (!tone && beep->playing) {
  50                 beep->playing = 0;
  51                 if (beep->power_hook)
  52                         beep->power_hook(beep, false);
  53                 snd_hda_power_down(codec);
  54         }
  55 }
  56
  57 static void snd_hda_generate_beep(struct work_struct *work)
  58 {
  59         struct hda_beep *beep =
  60                 container_of(work, struct hda_beep, beep_work);
  61
  62         if (beep->enabled)
  63                 generate_tone(beep, beep->tone);
  64 }
  65
  66 /* (non-standard) Linear beep tone calculation for IDT/STAC codecs
  67  *
  68  * The tone frequency of beep generator on IDT/STAC codecs is
  69  * defined from the 8bit tone parameter, in Hz,
  70  *    freq = 48000 * (257 - tone) / 1024
  71  * that is from 12kHz to 93.75Hz in steps of 46.875 Hz
  72  */
  73 static int beep_linear_tone(struct hda_beep *beep, int hz)
  74 {
  75         if (hz <= 0)
  76                 return 0;
  77         hz *= 1000; /* fixed point */
  78         hz = hz - DIGBEEP_HZ_MIN
  79                 + DIGBEEP_HZ_STEP / 2; /* round to nearest step */
  80         if (hz < 0)
  81                 hz = 0; /* turn off PC beep*/
  82         else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
  83                 hz = 1; /* max frequency */
  84         else {
  85                 hz /= DIGBEEP_HZ_STEP;
  86                 hz = 255 - hz;
  87         }
  88         return hz;
  89 }
  90
  91 /* HD-audio standard beep tone parameter calculation
  92  *
  93  * The tone frequency in Hz is calculated as
  94  *   freq = 48000 / (tone * 4)
  95  * from 47Hz to 12kHz
  96  */
  97 static int beep_standard_tone(struct hda_beep *beep, int hz)
  98 {
  99         if (hz <= 0)
 100                 return 0; /* disabled */
 101         hz = 12000 / hz;
 102         if (hz > 0xff)
 103                 return 0xff;
 104         if (hz <= 0)
 105                 return 1;
 106         return hz;
 107 }
 108
 109 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
 110                                 unsigned int code, int hz)
 111 {
 112         struct hda_beep *beep = input_get_drvdata(dev);
 113
 114         switch (code) {
 115         case SND_BELL:
 116                 if (hz)
 117                         hz = 1000;
 118                 /* fallthru */
 119         case SND_TONE:
 120                 if (beep->linear_tone)
 121                         beep->tone = beep_linear_tone(beep, hz);
 122                 else
 123                         beep->tone = beep_standard_tone(beep, hz);
 124                 break;
 125         default:
 126                 return -1;
 127         }
 128
 129         /* schedule beep event */
 130         schedule_work(&beep->beep_work);
 131         return 0;
 132 }
 133
 134 static void turn_off_beep(struct hda_beep *beep)
 135 {
 136         cancel_work_sync(&beep->beep_work);
 137         if (beep->playing) {
 138                 /* turn off beep */
 139                 generate_tone(beep, 0);
 140         }
 141 }
 142
 143 static void snd_hda_do_detach(struct hda_beep *beep)
 144 {
 145         if (beep->registered)
 146                 input_unregister_device(beep->dev);
 147         else
 148                 input_free_device(beep->dev);
 149         beep->dev = NULL;
 150         turn_off_beep(beep);
 151 }
 152
 153 static int snd_hda_do_attach(struct hda_beep *beep)
 154 {
 155         struct input_dev *input_dev;
 156         struct hda_codec *codec = beep->codec;
 157
 158         input_dev = input_allocate_device();
 159         if (!input_dev)
 160                 return -ENOMEM;
 161
 162         /* setup digital beep device */
 163         input_dev->name = "HDA Digital PCBeep";
 164         input_dev->phys = beep->phys;
 165         input_dev->id.bustype = BUS_PCI;
 166         input_dev->dev.parent = &codec->card->card_dev;
 167
 168         input_dev->id.vendor = codec->core.vendor_id >> 16;
 169         input_dev->id.product = codec->core.vendor_id & 0xffff;
 170         input_dev->id.version = 0x01;
 171
 172         input_dev->evbit[0] = BIT_MASK(EV_SND);
 173         input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
 174         input_dev->event = snd_hda_beep_event;
 175         input_set_drvdata(input_dev, beep);
 176
 177         beep->dev = input_dev;
 178         return 0;
 179 }
 180
 181 /**
 182  * snd_hda_enable_beep_device - Turn on/off beep sound
 183  * @codec: the HDA codec
 184  * @enable: flag to turn on/off
 185  */
 186 int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
 187 {
 188         struct hda_beep *beep = codec->beep;
 189         if (!beep)
 190                 return 0;
 191         enable = !!enable;
 192         if (beep->enabled != enable) {
 193                 beep->enabled = enable;
 194                 if (!enable)
 195                         turn_off_beep(beep);
 196                 return 1;
 197         }
 198         return 0;
 199 }
 200 EXPORT_SYMBOL_GPL(snd_hda_enable_beep_device);
 201
 202 /**
 203  * snd_hda_attach_beep_device - Attach a beep input device
 204  * @codec: the HDA codec
 205  * @nid: beep NID
 206  *
 207  * Attach a beep object to the given widget.  If beep hint is turned off
 208  * explicitly or beep_mode of the codec is turned off, this doesn't nothing.
 209  *
 210  * The attached beep device has to be registered via
 211  * snd_hda_register_beep_device() and released via snd_hda_detach_beep_device()
 212  * appropriately.
 213  *
 214  * Currently, only one beep device is allowed to each codec.
 215  */
 216 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
 217 {
 218         struct hda_beep *beep;
 219         int err;
 220
 221         if (!snd_hda_get_bool_hint(codec, "beep"))
 222                 return 0; /* disabled explicitly by hints */
 223         if (codec->beep_mode == HDA_BEEP_MODE_OFF)
 224                 return 0; /* disabled by module option */
 225
 226         beep = kzalloc(sizeof(*beep), GFP_KERNEL);
 227         if (beep == NULL)
 228                 return -ENOMEM;
 229         snprintf(beep->phys, sizeof(beep->phys),
 230                 "card%d/codec#%d/beep0", codec->card->number, codec->addr);
 231         /* enable linear scale */
 232         snd_hda_codec_write_cache(codec, nid, 0,
 233                 AC_VERB_SET_DIGI_CONVERT_2, 0x01);
 234
 235         beep->nid = nid;
 236         beep->codec = codec;
 237         codec->beep = beep;
 238
 239         INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
 240         mutex_init(&beep->mutex);
 241
 242         err = snd_hda_do_attach(beep);
 243         if (err < 0) {
 244                 kfree(beep);
 245                 codec->beep = NULL;
 246                 return err;
 247         }
 248
 249         return 0;
 250 }
 251 EXPORT_SYMBOL_GPL(snd_hda_attach_beep_device);
 252
 253 /**
 254  * snd_hda_detach_beep_device - Detach the beep device
 255  * @codec: the HDA codec
 256  */
 257 void snd_hda_detach_beep_device(struct hda_codec *codec)
 258 {
 259         struct hda_beep *beep = codec->beep;
 260         if (beep) {
 261                 if (beep->dev)
 262                         snd_hda_do_detach(beep);
 263                 codec->beep = NULL;
 264                 kfree(beep);
 265         }
 266 }
 267 EXPORT_SYMBOL_GPL(snd_hda_detach_beep_device);
 268
 269 /**
 270  * snd_hda_register_beep_device - Register the beep device
 271  * @codec: the HDA codec
 272  */
 273 int snd_hda_register_beep_device(struct hda_codec *codec)
 274 {
 275         struct hda_beep *beep = codec->beep;
 276         int err;
 277
 278         if (!beep || !beep->dev)
 279                 return 0;
 280
 281         err = input_register_device(beep->dev);
 282         if (err < 0) {
 283                 codec_err(codec, "hda_beep: unable to register input device\n");
 284                 input_free_device(beep->dev);
 285                 codec->beep = NULL;
 286                 kfree(beep);
 287                 return err;
 288         }
 289         beep->registered = true;
 290         return 0;
 291 }
 292 EXPORT_SYMBOL_GPL(snd_hda_register_beep_device);
 293
 294 static bool ctl_has_mute(struct snd_kcontrol *kcontrol)
 295 {
 296         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 297         return query_amp_caps(codec, get_amp_nid(kcontrol),
 298                               get_amp_direction(kcontrol)) & AC_AMPCAP_MUTE;
 299 }
 300
 301 /* get/put callbacks for beep mute mixer switches */
 302
 303 /**
 304  * snd_hda_mixer_amp_switch_get_beep - Get callback for beep controls
 305  * @kcontrol: ctl element
 306  * @ucontrol: pointer to get/store the data
 307  */
 308 int snd_hda_mixer_amp_switch_get_beep(struct snd_kcontrol *kcontrol,
 309                                       struct snd_ctl_elem_value *ucontrol)
 310 {
 311         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 312         struct hda_beep *beep = codec->beep;
 313         if (beep && (!beep->enabled || !ctl_has_mute(kcontrol))) {
 314                 ucontrol->value.integer.value[0] =
 315                         ucontrol->value.integer.value[1] = beep->enabled;
 316                 return 0;
 317         }
 318         return snd_hda_mixer_amp_switch_get(kcontrol, ucontrol);
 319 }
 320 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_get_beep);
 321
 322 /**
 323  * snd_hda_mixer_amp_switch_put_beep - Put callback for beep controls
 324  * @kcontrol: ctl element
 325  * @ucontrol: pointer to get/store the data
 326  */
 327 int snd_hda_mixer_amp_switch_put_beep(struct snd_kcontrol *kcontrol,
 328                                       struct snd_ctl_elem_value *ucontrol)
 329 {
 330         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 331         struct hda_beep *beep = codec->beep;
 332         if (beep) {
 333                 u8 chs = get_amp_channels(kcontrol);
 334                 int enable = 0;
 335                 long *valp = ucontrol->value.integer.value;
 336                 if (chs & 1) {
 337                         enable |= *valp;
 338                         valp++;
 339                 }
 340                 if (chs & 2)
 341                         enable |= *valp;
 342                 snd_hda_enable_beep_device(codec, enable);
 343         }
 344         if (!ctl_has_mute(kcontrol))
 345                 return 0;
 346         return snd_hda_mixer_amp_switch_put(kcontrol, ucontrol);
 347 }
 348 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_put_beep);