diff options
Diffstat (limited to 'sound/pci/hda/hda_beep.c')
| -rw-r--r-- | sound/pci/hda/hda_beep.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_beep.c b/sound/pci/hda/hda_beep.c new file mode 100644 index 00000000..29714c81 --- /dev/null +++ b/sound/pci/hda/hda_beep.c @@ -0,0 +1,267 @@ +/* + * 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 <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); |