sound/pci/hda/hda_beep.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Digital Beep Input Interface for HD-audio codec
   4  *
   5  * Author: Matt Ranostay <matt.ranostay@konsulko.com>
   6  * Copyright (c) 2008 Embedded Alley Solutions Inc
   7  */
   8
   9 #include <linux/input.h>
  10 #include <linux/slab.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/export.h>
  13 #include <sound/core.h>
  14 #include "hda_beep.h"
  15 #include "hda_local.h"
  16
  17 enum {
  18         DIGBEEP_HZ_STEP = 46875,        /* 46.875 Hz */
  19         DIGBEEP_HZ_MIN = 93750,         /* 93.750 Hz */
  20         DIGBEEP_HZ_MAX = 12000000,      /* 12 KHz */
  21 };
  22
  23 /* generate or stop tone */
  24 static void generate_tone(struct hda_beep *beep, int tone)
  25 {
  26         struct hda_codec *codec = beep->codec;
  27
  28         if (tone && !beep->playing) {
  29                 snd_hda_power_up(codec);
  30                 if (beep->power_hook)
  31                         beep->power_hook(beep, true);
  32                 beep->playing = 1;
  33         }
  34         snd_hda_codec_write(codec, beep->nid, 0,
  35                             AC_VERB_SET_BEEP_CONTROL, tone);
  36         if (!tone && beep->playing) {
  37                 beep->playing = 0;
  38                 if (beep->power_hook)
  39                         beep->power_hook(beep, false);
  40                 snd_hda_power_down(codec);
  41         }
  42 }
  43
  44 static void snd_hda_generate_beep(struct work_struct *work)
  45 {
  46         struct hda_beep *beep =
  47                 container_of(work, struct hda_beep, beep_work);
  48
  49         if (beep->enabled)
  50                 generate_tone(beep, beep->tone);
  51 }
  52
  53 /* (non-standard) Linear beep tone calculation for IDT/STAC codecs
  54  *
  55  * The tone frequency of beep generator on IDT/STAC codecs is
  56  * defined from the 8bit tone parameter, in Hz,
  57  *    freq = 48000 * (257 - tone) / 1024
  58  * that is from 12kHz to 93.75Hz in steps of 46.875 Hz
  59  */
  60 static int beep_linear_tone(struct hda_beep *beep, int hz)
  61 {
  62         if (hz <= 0)
  63                 return 0;
  64         hz *= 1000; /* fixed point */
  65         hz = hz - DIGBEEP_HZ_MIN
  66                 + DIGBEEP_HZ_STEP / 2; /* round to nearest step */
  67         if (hz < 0)
  68                 hz = 0; /* turn off PC beep*/
  69         else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
  70                 hz = 1; /* max frequency */
  71         else {
  72                 hz /= DIGBEEP_HZ_STEP;
  73                 hz = 255 - hz;
  74         }
  75         return hz;
  76 }
  77
  78 /* HD-audio standard beep tone parameter calculation
  79  *
  80  * The tone frequency in Hz is calculated as
  81  *   freq = 48000 / (tone * 4)
  82  * from 47Hz to 12kHz
  83  */
  84 static int beep_standard_tone(struct hda_beep *beep, int hz)
  85 {
  86         if (hz <= 0)
  87                 return 0; /* disabled */
  88         hz = 12000 / hz;
  89         if (hz > 0xff)
  90                 return 0xff;
  91         if (hz <= 0)
  92                 return 1;
  93         return hz;
  94 }
  95
  96 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
  97                                 unsigned int code, int hz)
  98 {
  99         struct hda_beep *beep = input_get_drvdata(dev);
 100
 101         switch (code) {
 102         case SND_BELL:
 103                 if (hz)
 104                         hz = 1000;
 105                 fallthrough;
 106         case SND_TONE:
 107                 if (beep->linear_tone)
 108                         beep->tone = beep_linear_tone(beep, hz);
 109                 else
 110                         beep->tone = beep_standard_tone(beep, hz);
 111                 break;
 112         default:
 113                 return -1;
 114         }
 115
 116         /* schedule beep event */
 117         schedule_work(&beep->beep_work);
 118         return 0;
 119 }
 120
 121 static void turn_on_beep(struct hda_beep *beep)
 122 {
 123         if (beep->keep_power_at_enable)
 124                 snd_hda_power_up_pm(beep->codec);
 125 }
 126
 127 static void turn_off_beep(struct hda_beep *beep)
 128 {
 129         cancel_work_sync(&beep->beep_work);
 130         if (beep->playing) {
 131                 /* turn off beep */
 132                 generate_tone(beep, 0);
 133         }
 134         if (beep->keep_power_at_enable)
 135                 snd_hda_power_down_pm(beep->codec);
 136 }
 137
 138 /**
 139  * snd_hda_enable_beep_device - Turn on/off beep sound
 140  * @codec: the HDA codec
 141  * @enable: flag to turn on/off
 142  */
 143 int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
 144 {
 145         struct hda_beep *beep = codec->beep;
 146         if (!beep)
 147                 return 0;
 148         enable = !!enable;
 149         if (beep->enabled != enable) {
 150                 beep->enabled = enable;
 151                 if (enable)
 152                         turn_on_beep(beep);
 153                 else
 154                         turn_off_beep(beep);
 155                 return 1;
 156         }
 157         return 0;
 158 }
 159 EXPORT_SYMBOL_GPL(snd_hda_enable_beep_device);
 160
 161 static int beep_dev_register(struct snd_device *device)
 162 {
 163         struct hda_beep *beep = device->device_data;
 164         int err;
 165
 166         err = input_register_device(beep->dev);
 167         if (!err)
 168                 beep->registered = true;
 169         return err;
 170 }
 171
 172 static int beep_dev_disconnect(struct snd_device *device)
 173 {
 174         struct hda_beep *beep = device->device_data;
 175
 176         if (beep->registered)
 177                 input_unregister_device(beep->dev);
 178         else
 179                 input_free_device(beep->dev);
 180         if (beep->enabled)
 181                 turn_off_beep(beep);
 182         return 0;
 183 }
 184
 185 static int beep_dev_free(struct snd_device *device)
 186 {
 187         struct hda_beep *beep = device->device_data;
 188
 189         beep->codec->beep = NULL;
 190         kfree(beep);
 191         return 0;
 192 }
 193
 194 /**
 195  * snd_hda_attach_beep_device - Attach a beep input device
 196  * @codec: the HDA codec
 197  * @nid: beep NID
 198  *
 199  * Attach a beep object to the given widget.  If beep hint is turned off
 200  * explicitly or beep_mode of the codec is turned off, this doesn't nothing.
 201  *
 202  * Currently, only one beep device is allowed to each codec.
 203  */
 204 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
 205 {
 206         static const struct snd_device_ops ops = {
 207                 .dev_register = beep_dev_register,
 208                 .dev_disconnect = beep_dev_disconnect,
 209                 .dev_free = beep_dev_free,
 210         };
 211         struct input_dev *input_dev;
 212         struct hda_beep *beep;
 213         int err;
 214
 215         if (!snd_hda_get_bool_hint(codec, "beep"))
 216                 return 0; /* disabled explicitly by hints */
 217         if (codec->beep_mode == HDA_BEEP_MODE_OFF)
 218                 return 0; /* disabled by module option */
 219
 220         beep = kzalloc(sizeof(*beep), GFP_KERNEL);
 221         if (beep == NULL)
 222                 return -ENOMEM;
 223         snprintf(beep->phys, sizeof(beep->phys),
 224                 "card%d/codec#%d/beep0", codec->card->number, codec->addr);
 225         /* enable linear scale */
 226         snd_hda_codec_write_cache(codec, nid, 0,
 227                 AC_VERB_SET_DIGI_CONVERT_2, 0x01);
 228
 229         beep->nid = nid;
 230         beep->codec = codec;
 231         codec->beep = beep;
 232
 233         INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
 234
 235         input_dev = input_allocate_device();
 236         if (!input_dev) {
 237                 err = -ENOMEM;
 238                 goto err_free;
 239         }
 240
 241         /* setup digital beep device */
 242         input_dev->name = "HDA Digital PCBeep";
 243         input_dev->phys = beep->phys;
 244         input_dev->id.bustype = BUS_PCI;
 245         input_dev->dev.parent = &codec->card->card_dev;
 246
 247         input_dev->id.vendor = codec->core.vendor_id >> 16;
 248         input_dev->id.product = codec->core.vendor_id & 0xffff;
 249         input_dev->id.version = 0x01;
 250
 251         input_dev->evbit[0] = BIT_MASK(EV_SND);
 252         input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
 253         input_dev->event = snd_hda_beep_event;
 254         input_set_drvdata(input_dev, beep);
 255
 256         beep->dev = input_dev;
 257
 258         err = snd_device_new(codec->card, SNDRV_DEV_JACK, beep, &ops);
 259         if (err < 0)
 260                 goto err_input;
 261
 262         return 0;
 263
 264  err_input:
 265         input_free_device(beep->dev);
 266  err_free:
 267         kfree(beep);
 268         codec->beep = NULL;
 269         return err;
 270 }
 271 EXPORT_SYMBOL_GPL(snd_hda_attach_beep_device);
 272
 273 /**
 274  * snd_hda_detach_beep_device - Detach the beep device
 275  * @codec: the HDA codec
 276  */
 277 void snd_hda_detach_beep_device(struct hda_codec *codec)
 278 {
 279         if (!codec->bus->shutdown && codec->beep)
 280                 snd_device_free(codec->card, codec->beep);
 281 }
 282 EXPORT_SYMBOL_GPL(snd_hda_detach_beep_device);
 283
 284 static bool ctl_has_mute(struct snd_kcontrol *kcontrol)
 285 {
 286         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 287         return query_amp_caps(codec, get_amp_nid(kcontrol),
 288                               get_amp_direction(kcontrol)) & AC_AMPCAP_MUTE;
 289 }
 290
 291 /* get/put callbacks for beep mute mixer switches */
 292
 293 /**
 294  * snd_hda_mixer_amp_switch_get_beep - Get callback for beep controls
 295  * @kcontrol: ctl element
 296  * @ucontrol: pointer to get/store the data
 297  */
 298 int snd_hda_mixer_amp_switch_get_beep(struct snd_kcontrol *kcontrol,
 299                                       struct snd_ctl_elem_value *ucontrol)
 300 {
 301         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 302         struct hda_beep *beep = codec->beep;
 303         int chs = get_amp_channels(kcontrol);
 304
 305         if (beep && (!beep->enabled || !ctl_has_mute(kcontrol))) {
 306                 if (chs & 1)
 307                         ucontrol->value.integer.value[0] = beep->enabled;
 308                 if (chs & 2)
 309                         ucontrol->value.integer.value[1] = beep->enabled;
 310                 return 0;
 311         }
 312         return snd_hda_mixer_amp_switch_get(kcontrol, ucontrol);
 313 }
 314 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_get_beep);
 315
 316 /**
 317  * snd_hda_mixer_amp_switch_put_beep - Put callback for beep controls
 318  * @kcontrol: ctl element
 319  * @ucontrol: pointer to get/store the data
 320  */
 321 int snd_hda_mixer_amp_switch_put_beep(struct snd_kcontrol *kcontrol,
 322                                       struct snd_ctl_elem_value *ucontrol)
 323 {
 324         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 325         struct hda_beep *beep = codec->beep;
 326         if (beep) {
 327                 u8 chs = get_amp_channels(kcontrol);
 328                 int enable = 0;
 329                 long *valp = ucontrol->value.integer.value;
 330                 if (chs & 1) {
 331                         enable |= *valp;
 332                         valp++;
 333                 }
 334                 if (chs & 2)
 335                         enable |= *valp;
 336                 snd_hda_enable_beep_device(codec, enable);
 337         }
 338         if (!ctl_has_mute(kcontrol))
 339                 return 0;
 340         return snd_hda_mixer_amp_switch_put(kcontrol, ucontrol);
 341 }
 342 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_put_beep);