--- /dev/null
+/*
+ * Digital Beep Input Interface for HD-audio codec
+ *
+ * Author: Matthew Ranostay <mranostay@embeddedalley.com>
+ * Copyright (c) 2008 Embedded Alley Solutions Inc
+ *
+ * This driver is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This driver is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#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;
+ if (beep && (!beep->enabled || !ctl_has_mute(kcontrol))) {
+ ucontrol->value.integer.value[0] =
+ 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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