[mirror_ubuntu-bionic-kernel.git] / sound / pci / hda / hda_beep.c

/*
 * 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/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 */
};

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(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(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(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) {
		int err = snd_hda_do_attach(beep);
		if (err < 0) {
			kfree(beep);
			codec->beep = NULL;
			return err;
		}
	}

	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->dev)
			snd_hda_do_detach(beep);
		codec->beep = NULL;
		kfree(beep);
	}
}
EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device);
Commit	Line	Data
1cd2224c MR	1	/*
	2	* Digital Beep Input Interface for HD-audio codec
	3	*
	4	* Author: Matthew Ranostay <mranostay@embeddedalley.com>
	5	* Copyright (c) 2008 Embedded Alley Solutions Inc
	6	*
	7	* This driver is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This driver is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
	22	#include <linux/input.h>
	23	#include <linux/pci.h>
5a0e3ad6	24	#include <linux/slab.h>
1cd2224c	25	#include <linux/workqueue.h>
d81a6d71	26	#include <linux/export.h>
1cd2224c MR	27	#include <sound/core.h>
1cd2224c MR	28	#include "hda_beep.h"
b7b51141	29	#include "hda_local.h"
1cd2224c MR	30
	31	enum {
	32	DIGBEEP_HZ_STEP = 46875, /* 46.875 Hz */
	33	DIGBEEP_HZ_MIN = 93750, /* 93.750 Hz */
	34	DIGBEEP_HZ_MAX = 12000000, /* 12 KHz */
	35	};
	36
	37	static void snd_hda_generate_beep(struct work_struct *work)
	38	{
	39	struct hda_beep *beep =
	40	container_of(work, struct hda_beep, beep_work);
	41	struct hda_codec *codec = beep->codec;
	42
4d4e9bb3 TI	43	if (!beep->enabled)
	44	return;
	45
1cd2224c	46	/* generate tone */
411fe85c	47	snd_hda_codec_write(codec, beep->nid, 0,
1cd2224c MR	48	AC_VERB_SET_BEEP_CONTROL, beep->tone);
	49	}
	50
fa797966 TI	51	/* (non-standard) Linear beep tone calculation for IDT/STAC codecs
	52	*
	53	* The tone frequency of beep generator on IDT/STAC codecs is
	54	* defined from the 8bit tone parameter, in Hz,
	55	* freq = 48000 * (257 - tone) / 1024
369693dc	56	* that is from 12kHz to 93.75Hz in steps of 46.875 Hz
fa797966 TI	57	*/
	58	static int beep_linear_tone(struct hda_beep *beep, int hz)
	59	{
369693dc PV	60	if (hz <= 0)
369693dc PV	61	return 0;
fa797966	62	hz = 1000; / fixed point */
369693dc PV	63	hz = hz - DIGBEEP_HZ_MIN
369693dc PV	64	+ DIGBEEP_HZ_STEP / 2; /* round to nearest step */
fa797966 TI	65	if (hz < 0)
	66	hz = 0; /* turn off PC beep*/
	67	else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
369693dc	68	hz = 1; /* max frequency */
fa797966 TI	69	else {
fa797966 TI	70	hz /= DIGBEEP_HZ_STEP;
369693dc	71	hz = 255 - hz;
fa797966 TI	72	}
	73	return hz;
	74	}
	75
	76	/* HD-audio standard beep tone parameter calculation
	77	*
	78	* The tone frequency in Hz is calculated as
	79	* freq = 48000 / (tone * 4)
	80	* from 47Hz to 12kHz
	81	*/
	82	static int beep_standard_tone(struct hda_beep *beep, int hz)
	83	{
	84	if (hz <= 0)
	85	return 0; /* disabled */
	86	hz = 12000 / hz;
	87	if (hz > 0xff)
	88	return 0xff;
	89	if (hz <= 0)
	90	return 1;
	91	return hz;
	92	}
	93
1cd2224c MR	94	static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
	95	unsigned int code, int hz)
	96	{
	97	struct hda_beep *beep = input_get_drvdata(dev);
	98
	99	switch (code) {
	100	case SND_BELL:
	101	if (hz)
	102	hz = 1000;
	103	case SND_TONE:
fa797966 TI	104	if (beep->linear_tone)
	105	beep->tone = beep_linear_tone(beep, hz);
	106	else
	107	beep->tone = beep_standard_tone(beep, hz);
1cd2224c MR	108	break;
	109	default:
	110	return -1;
	111	}
1cd2224c MR	112
	113	/* schedule beep event */
	114	schedule_work(&beep->beep_work);
	115	return 0;
	116	}
	117
123c07ae JK	118	static void snd_hda_do_detach(struct hda_beep *beep)
	119	{
	120	input_unregister_device(beep->dev);
	121	beep->dev = NULL;
	122	cancel_work_sync(&beep->beep_work);
	123	/* turn off beep for sure */
411fe85c	124	snd_hda_codec_write(beep->codec, beep->nid, 0,
123c07ae JK	125	AC_VERB_SET_BEEP_CONTROL, 0);
	126	}
	127
	128	static int snd_hda_do_attach(struct hda_beep *beep)
1cd2224c MR	129	{
1cd2224c MR	130	struct input_dev *input_dev;
123c07ae	131	struct hda_codec *codec = beep->codec;
1cd2224c MR	132	int err;
1cd2224c MR	133
1cd2224c	134	input_dev = input_allocate_device();
6a12afb5	135	if (!input_dev) {
123c07ae	136	printk(KERN_INFO "hda_beep: unable to allocate input device\n");
6a12afb5 TI	137	return -ENOMEM;
6a12afb5 TI	138	}
1cd2224c MR	139
	140	/* setup digital beep device */
	141	input_dev->name = "HDA Digital PCBeep";
	142	input_dev->phys = beep->phys;
	143	input_dev->id.bustype = BUS_PCI;
	144
	145	input_dev->id.vendor = codec->vendor_id >> 16;
	146	input_dev->id.product = codec->vendor_id & 0xffff;
	147	input_dev->id.version = 0x01;
	148
	149	input_dev->evbit[0] = BIT_MASK(EV_SND);
	150	input_dev->sndbit[0] = BIT_MASK(SND_BELL) \| BIT_MASK(SND_TONE);
	151	input_dev->event = snd_hda_beep_event;
	152	input_dev->dev.parent = &codec->bus->pci->dev;
	153	input_set_drvdata(input_dev, beep);
	154
	155	err = input_register_device(input_dev);
	156	if (err < 0) {
f6154d6d	157	input_free_device(input_dev);
123c07ae	158	printk(KERN_INFO "hda_beep: unable to register input device\n");
1cd2224c MR	159	return err;
1cd2224c MR	160	}
123c07ae JK	161	beep->dev = input_dev;
	162	return 0;
	163	}
	164
	165	static void snd_hda_do_register(struct work_struct *work)
	166	{
	167	struct hda_beep *beep =
	168	container_of(work, struct hda_beep, register_work);
123c07ae JK	169
123c07ae JK	170	mutex_lock(&beep->mutex);
13dab080 JK	171	if (beep->enabled && !beep->dev)
	172	snd_hda_do_attach(beep);
	173	mutex_unlock(&beep->mutex);
	174	}
	175
	176	static void snd_hda_do_unregister(struct work_struct *work)
	177	{
	178	struct hda_beep *beep =
	179	container_of(work, struct hda_beep, unregister_work.work);
	180
	181	mutex_lock(&beep->mutex);
	182	if (!beep->enabled && beep->dev)
	183	snd_hda_do_detach(beep);
123c07ae JK	184	mutex_unlock(&beep->mutex);
	185	}
	186
	187	int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
	188	{
	189	struct hda_beep *beep = codec->beep;
	190	enable = !!enable;
13dab080 JK	191	if (beep == NULL)
	192	return 0;
	193	if (beep->enabled != enable) {
	194	beep->enabled = enable;
2dca0bba	195	if (!enable) {
13dab080	196	/* turn off beep */
411fe85c	197	snd_hda_codec_write(beep->codec, beep->nid, 0,
13dab080	198	AC_VERB_SET_BEEP_CONTROL, 0);
2dca0bba JK	199	}
	200	if (beep->mode == HDA_BEEP_MODE_SWREG) {
	201	if (enable) {
	202	cancel_delayed_work(&beep->unregister_work);
	203	schedule_work(&beep->register_work);
	204	} else {
	205	schedule_delayed_work(&beep->unregister_work,
	206	HZ);
	207	}
13dab080	208	}
123c07ae JK	209	return 1;
	210	}
	211	return 0;
	212	}
	213	EXPORT_SYMBOL_HDA(snd_hda_enable_beep_device);
	214
	215	int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
	216	{
	217	struct hda_beep *beep;
	218
	219	if (!snd_hda_get_bool_hint(codec, "beep"))
9bb1fe39 TI	220	return 0; /* disabled explicitly by hints */
	221	if (codec->beep_mode == HDA_BEEP_MODE_OFF)
	222	return 0; /* disabled by module option */
1cd2224c	223
123c07ae JK	224	beep = kzalloc(sizeof(*beep), GFP_KERNEL);
	225	if (beep == NULL)
	226	return -ENOMEM;
	227	snprintf(beep->phys, sizeof(beep->phys),
	228	"card%d/codec#%d/beep0", codec->bus->card->number, codec->addr);
1cd2224c MR	229	/* enable linear scale */
	230	snd_hda_codec_write(codec, nid, 0,
	231	AC_VERB_SET_DIGI_CONVERT_2, 0x01);
	232
	233	beep->nid = nid;
1cd2224c	234	beep->codec = codec;
2dca0bba	235	beep->mode = codec->beep_mode;
1cd2224c MR	236	codec->beep = beep;
1cd2224c MR	237
123c07ae	238	INIT_WORK(&beep->register_work, &snd_hda_do_register);
13dab080	239	INIT_DELAYED_WORK(&beep->unregister_work, &snd_hda_do_unregister);
1cd2224c	240	INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
123c07ae JK	241	mutex_init(&beep->mutex);
123c07ae JK	242
2dca0bba	243	if (beep->mode == HDA_BEEP_MODE_ON) {
54f7190b TI	244	int err = snd_hda_do_attach(beep);
	245	if (err < 0) {
	246	kfree(beep);
	247	codec->beep = NULL;
	248	return err;
	249	}
2dca0bba JK	250	}
2dca0bba JK	251
1cd2224c MR	252	return 0;
1cd2224c MR	253	}
ff7a3267	254	EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device);
1cd2224c MR	255
	256	void snd_hda_detach_beep_device(struct hda_codec *codec)
	257	{
	258	struct hda_beep *beep = codec->beep;
	259	if (beep) {
123c07ae	260	cancel_work_sync(&beep->register_work);
5f816697	261	cancel_delayed_work(&beep->unregister_work);
54f7190b	262	if (beep->dev)
123c07ae	263	snd_hda_do_detach(beep);
c44765b8	264	codec->beep = NULL;
123c07ae	265	kfree(beep);
1cd2224c MR	266	}
1cd2224c MR	267	}
ff7a3267	268	EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device);