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// SPDX-License-Identifier: GPL-2.0+
/*
* Digital Beep Input Interface for HD-audio codec
*
* Author: Matt Ranostay <matt.ranostay@konsulko.com>
* Copyright (c) 2008 Embedded Alley Solutions Inc
*/
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/export.h>
#include <sound/core.h>
#include "hda_beep.h"
#include "hda_local.h"
enum {
DIGBEEP_HZ_STEP = 46875, /* 46.875 Hz */
DIGBEEP_HZ_MIN = 93750, /* 93.750 Hz */
DIGBEEP_HZ_MAX = 12000000, /* 12 KHz */
};
/* generate or stop tone */
static void generate_tone(struct hda_beep *beep, int tone)
{
struct hda_codec *codec = beep->codec;
if (tone && !beep->playing) {
snd_hda_power_up(codec);
if (beep->power_hook)
beep->power_hook(beep, true);
beep->playing = 1;
}
snd_hda_codec_write(codec, beep->nid, 0,
AC_VERB_SET_BEEP_CONTROL, tone);
if (!tone && beep->playing) {
beep->playing = 0;
if (beep->power_hook)
beep->power_hook(beep, false);
snd_hda_power_down(codec);
}
}
static void snd_hda_generate_beep(struct work_struct *work)
{
struct hda_beep *beep =
container_of(work, struct hda_beep, beep_work);
if (beep->enabled)
generate_tone(beep, beep->tone);
}
/* (non-standard) Linear beep tone calculation for IDT/STAC codecs
*
* The tone frequency of beep generator on IDT/STAC codecs is
* defined from the 8bit tone parameter, in Hz,
* freq = 48000 * (257 - tone) / 1024
* that is from 12kHz to 93.75Hz in steps of 46.875 Hz
*/
static int beep_linear_tone(struct hda_beep *beep, int hz)
{
if (hz <= 0)
return 0;
hz *= 1000; /* fixed point */
hz = hz - DIGBEEP_HZ_MIN
+ DIGBEEP_HZ_STEP / 2; /* round to nearest step */
if (hz < 0)
hz = 0; /* turn off PC beep*/
else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
hz = 1; /* max frequency */
else {
hz /= DIGBEEP_HZ_STEP;
hz = 255 - hz;
}
return hz;
}
/* HD-audio standard beep tone parameter calculation
*
* The tone frequency in Hz is calculated as
* freq = 48000 / (tone * 4)
* from 47Hz to 12kHz
*/
static int beep_standard_tone(struct hda_beep *beep, int hz)
{
if (hz <= 0)
return 0; /* disabled */
hz = 12000 / hz;
if (hz > 0xff)
return 0xff;
if (hz <= 0)
return 1;
return hz;
}
static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
unsigned int code, int hz)
{
struct hda_beep *beep = input_get_drvdata(dev);
switch (code) {
case SND_BELL:
if (hz)
hz = 1000;
fallthrough;
case SND_TONE:
if (beep->linear_tone)
beep->tone = beep_linear_tone(beep, hz);
else
beep->tone = beep_standard_tone(beep, hz);
break;
default:
return -1;
}
/* schedule beep event */
schedule_work(&beep->beep_work);
return 0;
}
static void turn_on_beep(struct hda_beep *beep)
{
if (beep->keep_power_at_enable)
snd_hda_power_up_pm(beep->codec);
}
static void turn_off_beep(struct hda_beep *beep)
{
cancel_work_sync(&beep->beep_work);
if (beep->playing) {
/* turn off beep */
generate_tone(beep, 0);
}
if (beep->keep_power_at_enable)
snd_hda_power_down_pm(beep->codec);
}
/**
* snd_hda_enable_beep_device - Turn on/off beep sound
* @codec: the HDA codec
* @enable: flag to turn on/off
*/
int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
{
struct hda_beep *beep = codec->beep;
if (!beep)
return 0;
enable = !!enable;
if (beep->enabled != enable) {
beep->enabled = enable;
if (enable)
turn_on_beep(beep);
else
turn_off_beep(beep);
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_hda_enable_beep_device);
static int beep_dev_register(struct snd_device *device)
{
struct hda_beep *beep = device->device_data;
int err;
err = input_register_device(beep->dev);
if (!err)
beep->registered = true;
return err;
}
static int beep_dev_disconnect(struct snd_device *device)
{
struct hda_beep *beep = device->device_data;
if (beep->registered)
input_unregister_device(beep->dev);
else
input_free_device(beep->dev);
if (beep->enabled)
turn_off_beep(beep);
return 0;
}
static int beep_dev_free(struct snd_device *device)
{
struct hda_beep *beep = device->device_data;
beep->codec->beep = NULL;
kfree(beep);
return 0;
}
/**
* snd_hda_attach_beep_device - Attach a beep input device
* @codec: the HDA codec
* @nid: beep NID
*
* Attach a beep object to the given widget. If beep hint is turned off
* explicitly or beep_mode of the codec is turned off, this doesn't nothing.
*
* Currently, only one beep device is allowed to each codec.
*/
int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
{
static const struct snd_device_ops ops = {
.dev_register = beep_dev_register,
.dev_disconnect = beep_dev_disconnect,
.dev_free = beep_dev_free,
};
struct input_dev *input_dev;
struct hda_beep *beep;
int err;
if (!snd_hda_get_bool_hint(codec, "beep"))
return 0; /* disabled explicitly by hints */
if (codec->beep_mode == HDA_BEEP_MODE_OFF)
return 0; /* disabled by module option */
beep = kzalloc(sizeof(*beep), GFP_KERNEL);
if (beep == NULL)
return -ENOMEM;
snprintf(beep->phys, sizeof(beep->phys),
"card%d/codec#%d/beep0", codec->card->number, codec->addr);
/* enable linear scale */
snd_hda_codec_write_cache(codec, nid, 0,
AC_VERB_SET_DIGI_CONVERT_2, 0x01);
beep->nid = nid;
beep->codec = codec;
codec->beep = beep;
INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
mutex_init(&beep->mutex);
input_dev = input_allocate_device();
if (!input_dev) {
err = -ENOMEM;
goto err_free;
}
/* setup digital beep device */
input_dev->name = "HDA Digital PCBeep";
input_dev->phys = beep->phys;
input_dev->id.bustype = BUS_PCI;
input_dev->dev.parent = &codec->card->card_dev;
input_dev->id.vendor = codec->core.vendor_id >> 16;
input_dev->id.product = codec->core.vendor_id & 0xffff;
input_dev->id.version = 0x01;
input_dev->evbit[0] = BIT_MASK(EV_SND);
input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
input_dev->event = snd_hda_beep_event;
input_set_drvdata(input_dev, beep);
beep->dev = input_dev;
err = snd_device_new(codec->card, SNDRV_DEV_JACK, beep, &ops);
if (err < 0)
goto err_input;
return 0;
err_input:
input_free_device(beep->dev);
err_free:
kfree(beep);
codec->beep = NULL;
return err;
}
EXPORT_SYMBOL_GPL(snd_hda_attach_beep_device);
/**
* snd_hda_detach_beep_device - Detach the beep device
* @codec: the HDA codec
*/
void snd_hda_detach_beep_device(struct hda_codec *codec)
{
if (!codec->bus->shutdown && codec->beep)
snd_device_free(codec->card, codec->beep);
}
EXPORT_SYMBOL_GPL(snd_hda_detach_beep_device);
static bool ctl_has_mute(struct snd_kcontrol *kcontrol)
{
struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
return query_amp_caps(codec, get_amp_nid(kcontrol),
get_amp_direction(kcontrol)) & AC_AMPCAP_MUTE;
}
/* get/put callbacks for beep mute mixer switches */
/**
* snd_hda_mixer_amp_switch_get_beep - Get callback for beep controls
* @kcontrol: ctl element
* @ucontrol: pointer to get/store the data
*/
int snd_hda_mixer_amp_switch_get_beep(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
struct hda_beep *beep = codec->beep;
int chs = get_amp_channels(kcontrol);
if (beep && (!beep->enabled || !ctl_has_mute(kcontrol))) {
if (chs & 1)
ucontrol->value.integer.value[0] = beep->enabled;
if (chs & 2)
ucontrol->value.integer.value[1] = beep->enabled;
return 0;
}
return snd_hda_mixer_amp_switch_get(kcontrol, ucontrol);
}
EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_get_beep);
/**
* snd_hda_mixer_amp_switch_put_beep - Put callback for beep controls
* @kcontrol: ctl element
* @ucontrol: pointer to get/store the data
*/
int snd_hda_mixer_amp_switch_put_beep(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
struct hda_beep *beep = codec->beep;
if (beep) {
u8 chs = get_amp_channels(kcontrol);
int enable = 0;
long *valp = ucontrol->value.integer.value;
if (chs & 1) {
enable |= *valp;
valp++;
}
if (chs & 2)
enable |= *valp;
snd_hda_enable_beep_device(codec, enable);
}
if (!ctl_has_mute(kcontrol))
return 0;
return snd_hda_mixer_amp_switch_put(kcontrol, ucontrol);
}
EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_put_beep);
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