178 lines
4.4 KiB
C
178 lines
4.4 KiB
C
/*
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* Digital Beep Input Interface for HD-audio codec
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*
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* Author: Matthew Ranostay <mranostay@embeddedalley.com>
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* Copyright (c) 2008 Embedded Alley Solutions Inc
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*
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* This driver is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This driver is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/input.h>
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#include <linux/pci.h>
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#include <linux/workqueue.h>
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#include <sound/core.h>
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#include "hda_beep.h"
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enum {
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DIGBEEP_HZ_STEP = 46875, /* 46.875 Hz */
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DIGBEEP_HZ_MIN = 93750, /* 93.750 Hz */
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DIGBEEP_HZ_MAX = 12000000, /* 12 KHz */
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};
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static void snd_hda_generate_beep(struct work_struct *work)
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{
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struct hda_beep *beep =
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container_of(work, struct hda_beep, beep_work);
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struct hda_codec *codec = beep->codec;
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if (!beep->enabled)
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return;
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/* generate tone */
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snd_hda_codec_write_cache(codec, beep->nid, 0,
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AC_VERB_SET_BEEP_CONTROL, beep->tone);
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}
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/* (non-standard) Linear beep tone calculation for IDT/STAC codecs
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*
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* The tone frequency of beep generator on IDT/STAC codecs is
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* defined from the 8bit tone parameter, in Hz,
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* freq = 48000 * (257 - tone) / 1024
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* that is from 12kHz to 93.75kHz in step of 46.875 hz
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*/
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static int beep_linear_tone(struct hda_beep *beep, int hz)
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{
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hz *= 1000; /* fixed point */
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hz = hz - DIGBEEP_HZ_MIN;
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if (hz < 0)
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hz = 0; /* turn off PC beep*/
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else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
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hz = 0xff;
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else {
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hz /= DIGBEEP_HZ_STEP;
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hz++;
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}
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return hz;
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}
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/* HD-audio standard beep tone parameter calculation
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*
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* The tone frequency in Hz is calculated as
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* freq = 48000 / (tone * 4)
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* from 47Hz to 12kHz
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*/
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static int beep_standard_tone(struct hda_beep *beep, int hz)
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{
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if (hz <= 0)
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return 0; /* disabled */
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hz = 12000 / hz;
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if (hz > 0xff)
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return 0xff;
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if (hz <= 0)
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return 1;
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return hz;
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}
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static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
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unsigned int code, int hz)
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{
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struct hda_beep *beep = input_get_drvdata(dev);
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switch (code) {
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case SND_BELL:
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if (hz)
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hz = 1000;
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case SND_TONE:
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if (beep->linear_tone)
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beep->tone = beep_linear_tone(beep, hz);
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else
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beep->tone = beep_standard_tone(beep, hz);
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break;
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default:
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return -1;
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}
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/* schedule beep event */
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schedule_work(&beep->beep_work);
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return 0;
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}
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int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
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{
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struct input_dev *input_dev;
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struct hda_beep *beep;
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int err;
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beep = kzalloc(sizeof(*beep), GFP_KERNEL);
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if (beep == NULL)
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return -ENOMEM;
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snprintf(beep->phys, sizeof(beep->phys),
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"card%d/codec#%d/beep0", codec->bus->card->number, codec->addr);
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input_dev = input_allocate_device();
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if (!input_dev) {
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kfree(beep);
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return -ENOMEM;
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}
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/* setup digital beep device */
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input_dev->name = "HDA Digital PCBeep";
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input_dev->phys = beep->phys;
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input_dev->id.bustype = BUS_PCI;
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input_dev->id.vendor = codec->vendor_id >> 16;
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input_dev->id.product = codec->vendor_id & 0xffff;
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input_dev->id.version = 0x01;
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input_dev->evbit[0] = BIT_MASK(EV_SND);
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input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
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input_dev->event = snd_hda_beep_event;
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input_dev->dev.parent = &codec->bus->pci->dev;
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input_set_drvdata(input_dev, beep);
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err = input_register_device(input_dev);
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if (err < 0) {
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input_free_device(input_dev);
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kfree(beep);
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return err;
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}
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/* enable linear scale */
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snd_hda_codec_write(codec, nid, 0,
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AC_VERB_SET_DIGI_CONVERT_2, 0x01);
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beep->nid = nid;
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beep->dev = input_dev;
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beep->codec = codec;
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beep->enabled = 1;
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codec->beep = beep;
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INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
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return 0;
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}
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EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device);
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void snd_hda_detach_beep_device(struct hda_codec *codec)
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{
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struct hda_beep *beep = codec->beep;
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if (beep) {
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cancel_work_sync(&beep->beep_work);
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input_unregister_device(beep->dev);
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kfree(beep);
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codec->beep = NULL;
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}
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}
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EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device);
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