1 files changed, 339 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_beep.c b/sound/pci/hda/hda_beep.c
new file mode 100644
index 000000000..0224011a2
--- /dev/null
+++ b/sound/pci/hda/hda_beep.c
@@ -0,0 +1,339 @@
+// 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;
+		/* fallthru */
+	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_off_beep(struct hda_beep *beep)
+{
+	cancel_work_sync(&beep->beep_work);
+	if (beep->playing) {
+		/* turn off beep */
+		generate_tone(beep, 0);
+	}
+}
+
+static void snd_hda_do_detach(struct hda_beep *beep)
+{
+	if (beep->registered)
+		input_unregister_device(beep->dev);
+	else
+		input_free_device(beep->dev);
+	beep->dev = NULL;
+	turn_off_beep(beep);
+}
+
+static int snd_hda_do_attach(struct hda_beep *beep)
+{
+	struct input_dev *input_dev;
+	struct hda_codec *codec = beep->codec;
+
+	input_dev = input_allocate_device();
+	if (!input_dev)
+		return -ENOMEM;
+
+	/* 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;
+	return 0;
+}
+
+/**
+ * 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_off_beep(beep);
+		return 1;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hda_enable_beep_device);
+
+/**
+ * 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.
+ *
+ * The attached beep device has to be registered via
+ * snd_hda_register_beep_device() and released via snd_hda_detach_beep_device()
+ * appropriately.
+ *
+ * Currently, only one beep device is allowed to each codec.
+ */
+int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
+{
+	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);
+
+	err = snd_hda_do_attach(beep);
+	if (err < 0) {
+		kfree(beep);
+		codec->beep = NULL;
+		return err;
+	}
+
+	return 0;
+}
+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)
+{
+	struct hda_beep *beep = codec->beep;
+	if (beep) {
+		if (beep->dev)
+			snd_hda_do_detach(beep);
+		codec->beep = NULL;
+		kfree(beep);
+	}
+}
+EXPORT_SYMBOL_GPL(snd_hda_detach_beep_device);
+
+/**
+ * snd_hda_register_beep_device - Register the beep device
+ * @codec: the HDA codec
+ */
+int snd_hda_register_beep_device(struct hda_codec *codec)
+{
+	struct hda_beep *beep = codec->beep;
+	int err;
+
+	if (!beep || !beep->dev)
+		return 0;
+
+	err = input_register_device(beep->dev);
+	if (err < 0) {
+		codec_err(codec, "hda_beep: unable to register input device\n");
+		input_free_device(beep->dev);
+		codec->beep = NULL;
+		kfree(beep);
+		return err;
+	}
+	beep->registered = true;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hda_register_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);