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