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linux/sound/pci/hda/hda_beep.c
Paul Gortmaker d81a6d7176 sound: Add export.h for THIS_MODULE/EXPORT_SYMBOL where needed 
These aren't modules, but they do make use of these macros, so
they will need export.h to get that definition.  Previously,
they got it via the implicit module.h inclusion.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:22 -04:00

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6.7 KiB
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/*
* 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);
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