sound/pci/hda/hda_beep.c - linux - Git at Google

 /*
  * 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/pci.h>
 #include <linux/workqueue.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 */
 };

 static void snd_hda_generate_beep(struct work_struct *work)
 {
 	struct hda_beep *beep =
 		container_of(work, struct hda_beep, beep_work);
 	struct hda_codec *codec = beep->codec;

 	if (!beep->enabled)
 		return;

 	/* generate tone */
 	snd_hda_codec_write_cache(codec, beep->nid, 0,
 			AC_VERB_SET_BEEP_CONTROL, 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;
 	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 snd_hda_do_detach(struct hda_beep *beep)
 {
 	input_unregister_device(beep->dev);
 	beep->dev = NULL;
 	cancel_work_sync(&beep->beep_work);
 	/* turn off beep for sure */
 	snd_hda_codec_write_cache(beep->codec, beep->nid, 0,
 				  AC_VERB_SET_BEEP_CONTROL, 0);
 }

 static int snd_hda_do_attach(struct hda_beep *beep)
 {
 	struct input_dev *input_dev;
 	struct hda_codec *codec = beep->codec;
 	int err;

 	input_dev = input_allocate_device();
 	if (!input_dev) {
 		printk(KERN_INFO "hda_beep: unable to allocate input device\n");
 		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->id.vendor = codec->vendor_id >> 16;
 	input_dev->id.product = codec->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_dev->dev.parent = &codec->bus->pci->dev;
 	input_set_drvdata(input_dev, beep);

 	err = input_register_device(input_dev);
 	if (err < 0) {
 		input_free_device(input_dev);
 		printk(KERN_INFO "hda_beep: unable to register input device\n");
 		return err;
 	}
 	beep->dev = input_dev;
 	return 0;
 }

 static void snd_hda_do_register(struct work_struct *work)
 {
 	struct hda_beep *beep =
 		container_of(work, struct hda_beep, register_work);

 	mutex_lock(&beep->mutex);
 	if (beep->enabled && !beep->dev)
 		snd_hda_do_attach(beep);
 	mutex_unlock(&beep->mutex);
 }

 static void snd_hda_do_unregister(struct work_struct *work)
 {
 	struct hda_beep *beep =
 		container_of(work, struct hda_beep, unregister_work.work);

 	mutex_lock(&beep->mutex);
 	if (!beep->enabled && beep->dev)
 		snd_hda_do_detach(beep);
 	mutex_unlock(&beep->mutex);
 }

 int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
 {
 	struct hda_beep *beep = codec->beep;
 	enable = !!enable;
 	if (beep == NULL)
 		return 0;
 	if (beep->enabled != enable) {
 		beep->enabled = enable;
 		if (!enable) {
 			/* turn off beep */
 			snd_hda_codec_write_cache(beep->codec, beep->nid, 0,
 						  AC_VERB_SET_BEEP_CONTROL, 0);
 		}
 		if (beep->mode == HDA_BEEP_MODE_SWREG) {
 			if (enable) {
 				cancel_delayed_work(&beep->unregister_work);
 				schedule_work(&beep->register_work);
 			} else {
 				schedule_delayed_work(&beep->unregister_work,
 									   HZ);
 			}
 		}
 		return 1;
 	}
 	return 0;
 }
 EXPORT_SYMBOL_HDA(snd_hda_enable_beep_device);

 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
 {
 	struct hda_beep *beep;

 	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->bus->card->number, codec->addr);
 	/* enable linear scale */
 	snd_hda_codec_write(codec, nid, 0,
 		AC_VERB_SET_DIGI_CONVERT_2, 0x01);

 	beep->nid = nid;
 	beep->codec = codec;
 	beep->mode = codec->beep_mode;
 	codec->beep = beep;

 	INIT_WORK(&beep->register_work, &snd_hda_do_register);
 	INIT_DELAYED_WORK(&beep->unregister_work, &snd_hda_do_unregister);
 	INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
 	mutex_init(&beep->mutex);

 	if (beep->mode == HDA_BEEP_MODE_ON) {
 		beep->enabled = 1;
 		snd_hda_do_register(&beep->register_work);
 	}

 	return 0;
 }
 EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device);

 void snd_hda_detach_beep_device(struct hda_codec *codec)
 {
 	struct hda_beep *beep = codec->beep;
 	if (beep) {
 		cancel_work_sync(&beep->register_work);
 		cancel_delayed_work(&beep->unregister_work);
 		if (beep->enabled)
 			snd_hda_do_detach(beep);
 		codec->beep = NULL;
 		kfree(beep);
 	}
 }
 EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device);
	/*
	* 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/pci.h>
	#include <linux/workqueue.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 */
	};

	static void snd_hda_generate_beep(struct work_struct *work)
	{
	struct hda_beep *beep =
	container_of(work, struct hda_beep, beep_work);
	struct hda_codec *codec = beep->codec;

	if (!beep->enabled)
	return;

	/* generate tone */
	snd_hda_codec_write_cache(codec, beep->nid, 0,
	AC_VERB_SET_BEEP_CONTROL, 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;
	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 snd_hda_do_detach(struct hda_beep *beep)
	{
	input_unregister_device(beep->dev);
	beep->dev = NULL;
	cancel_work_sync(&beep->beep_work);
	/* turn off beep for sure */
	snd_hda_codec_write_cache(beep->codec, beep->nid, 0,
	AC_VERB_SET_BEEP_CONTROL, 0);
	}

	static int snd_hda_do_attach(struct hda_beep *beep)
	{
	struct input_dev *input_dev;
	struct hda_codec *codec = beep->codec;
	int err;

	input_dev = input_allocate_device();
	if (!input_dev) {
	printk(KERN_INFO "hda_beep: unable to allocate input device\n");
	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->id.vendor = codec->vendor_id >> 16;
	input_dev->id.product = codec->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_dev->dev.parent = &codec->bus->pci->dev;
	input_set_drvdata(input_dev, beep);

	err = input_register_device(input_dev);
	if (err < 0) {
	input_free_device(input_dev);
	printk(KERN_INFO "hda_beep: unable to register input device\n");
	return err;
	}
	beep->dev = input_dev;
	return 0;
	}

	static void snd_hda_do_register(struct work_struct *work)
	{
	struct hda_beep *beep =
	container_of(work, struct hda_beep, register_work);

	mutex_lock(&beep->mutex);
	if (beep->enabled && !beep->dev)
	snd_hda_do_attach(beep);
	mutex_unlock(&beep->mutex);
	}

	static void snd_hda_do_unregister(struct work_struct *work)
	{
	struct hda_beep *beep =
	container_of(work, struct hda_beep, unregister_work.work);

	mutex_lock(&beep->mutex);
	if (!beep->enabled && beep->dev)
	snd_hda_do_detach(beep);
	mutex_unlock(&beep->mutex);
	}

	int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
	{
	struct hda_beep *beep = codec->beep;
	enable = !!enable;
	if (beep == NULL)
	return 0;
	if (beep->enabled != enable) {
	beep->enabled = enable;
	if (!enable) {
	/* turn off beep */
	snd_hda_codec_write_cache(beep->codec, beep->nid, 0,
	AC_VERB_SET_BEEP_CONTROL, 0);
	}
	if (beep->mode == HDA_BEEP_MODE_SWREG) {
	if (enable) {
	cancel_delayed_work(&beep->unregister_work);
	schedule_work(&beep->register_work);
	} else {
	schedule_delayed_work(&beep->unregister_work,
	HZ);
	}
	}
	return 1;
	}
	return 0;
	}
	EXPORT_SYMBOL_HDA(snd_hda_enable_beep_device);

	int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
	{
	struct hda_beep *beep;

	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->bus->card->number, codec->addr);
	/* enable linear scale */
	snd_hda_codec_write(codec, nid, 0,
	AC_VERB_SET_DIGI_CONVERT_2, 0x01);

	beep->nid = nid;
	beep->codec = codec;
	beep->mode = codec->beep_mode;
	codec->beep = beep;

	INIT_WORK(&beep->register_work, &snd_hda_do_register);
	INIT_DELAYED_WORK(&beep->unregister_work, &snd_hda_do_unregister);
	INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
	mutex_init(&beep->mutex);

	if (beep->mode == HDA_BEEP_MODE_ON) {
	beep->enabled = 1;
	snd_hda_do_register(&beep->register_work);
	}

	return 0;
	}
	EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device);

	void snd_hda_detach_beep_device(struct hda_codec *codec)
	{
	struct hda_beep *beep = codec->beep;
	if (beep) {
	cancel_work_sync(&beep->register_work);
	cancel_delayed_work(&beep->unregister_work);
	if (beep->enabled)
	snd_hda_do_detach(beep);
	codec->beep = NULL;
	kfree(beep);
	}
	}
	EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device);