| /* |
| * 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/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 */ |
| }; |
| |
| /* generate or stop tone */ |
| static void generate_tone(struct hda_beep *beep, int tone) |
| { |
| struct hda_codec *codec = beep->codec; |
| |
| if (tone && !beep->playing) { |
| snd_hda_power_up(codec); |
| if (beep->power_hook) |
| beep->power_hook(beep, true); |
| beep->playing = 1; |
| } |
| snd_hda_codec_write(codec, beep->nid, 0, |
| AC_VERB_SET_BEEP_CONTROL, tone); |
| if (!tone && beep->playing) { |
| beep->playing = 0; |
| if (beep->power_hook) |
| beep->power_hook(beep, false); |
| snd_hda_power_down(codec); |
| } |
| } |
| |
| static void snd_hda_generate_beep(struct work_struct *work) |
| { |
| struct hda_beep *beep = |
| container_of(work, struct hda_beep, beep_work); |
| |
| if (beep->enabled) |
| generate_tone(beep, 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; |
| /* fallthru */ |
| 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 turn_off_beep(struct hda_beep *beep) |
| { |
| cancel_work_sync(&beep->beep_work); |
| if (beep->playing) { |
| /* turn off beep */ |
| generate_tone(beep, 0); |
| } |
| } |
| |
| static void snd_hda_do_detach(struct hda_beep *beep) |
| { |
| if (beep->registered) |
| input_unregister_device(beep->dev); |
| else |
| input_free_device(beep->dev); |
| beep->dev = NULL; |
| turn_off_beep(beep); |
| } |
| |
| static int snd_hda_do_attach(struct hda_beep *beep) |
| { |
| struct input_dev *input_dev; |
| struct hda_codec *codec = beep->codec; |
| |
| input_dev = input_allocate_device(); |
| if (!input_dev) |
| 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->dev.parent = &codec->card->card_dev; |
| |
| input_dev->id.vendor = codec->core.vendor_id >> 16; |
| input_dev->id.product = codec->core.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_set_drvdata(input_dev, beep); |
| |
| beep->dev = input_dev; |
| return 0; |
| } |
| |
| /** |
| * snd_hda_enable_beep_device - Turn on/off beep sound |
| * @codec: the HDA codec |
| * @enable: flag to turn on/off |
| */ |
| int snd_hda_enable_beep_device(struct hda_codec *codec, int enable) |
| { |
| struct hda_beep *beep = codec->beep; |
| if (!beep) |
| return 0; |
| enable = !!enable; |
| if (beep->enabled != enable) { |
| beep->enabled = enable; |
| if (!enable) |
| turn_off_beep(beep); |
| return 1; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(snd_hda_enable_beep_device); |
| |
| /** |
| * snd_hda_attach_beep_device - Attach a beep input device |
| * @codec: the HDA codec |
| * @nid: beep NID |
| * |
| * Attach a beep object to the given widget. If beep hint is turned off |
| * explicitly or beep_mode of the codec is turned off, this doesn't nothing. |
| * |
| * The attached beep device has to be registered via |
| * snd_hda_register_beep_device() and released via snd_hda_detach_beep_device() |
| * appropriately. |
| * |
| * Currently, only one beep device is allowed to each codec. |
| */ |
| int snd_hda_attach_beep_device(struct hda_codec *codec, int nid) |
| { |
| struct hda_beep *beep; |
| int err; |
| |
| 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->card->number, codec->addr); |
| /* enable linear scale */ |
| snd_hda_codec_write_cache(codec, nid, 0, |
| AC_VERB_SET_DIGI_CONVERT_2, 0x01); |
| |
| beep->nid = nid; |
| beep->codec = codec; |
| codec->beep = beep; |
| |
| INIT_WORK(&beep->beep_work, &snd_hda_generate_beep); |
| mutex_init(&beep->mutex); |
| |
| err = snd_hda_do_attach(beep); |
| if (err < 0) { |
| kfree(beep); |
| codec->beep = NULL; |
| return err; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(snd_hda_attach_beep_device); |
| |
| /** |
| * snd_hda_detach_beep_device - Detach the beep device |
| * @codec: the HDA codec |
| */ |
| void snd_hda_detach_beep_device(struct hda_codec *codec) |
| { |
| struct hda_beep *beep = codec->beep; |
| if (beep) { |
| if (beep->dev) |
| snd_hda_do_detach(beep); |
| codec->beep = NULL; |
| kfree(beep); |
| } |
| } |
| EXPORT_SYMBOL_GPL(snd_hda_detach_beep_device); |
| |
| /** |
| * snd_hda_register_beep_device - Register the beep device |
| * @codec: the HDA codec |
| */ |
| int snd_hda_register_beep_device(struct hda_codec *codec) |
| { |
| struct hda_beep *beep = codec->beep; |
| int err; |
| |
| if (!beep || !beep->dev) |
| return 0; |
| |
| err = input_register_device(beep->dev); |
| if (err < 0) { |
| codec_err(codec, "hda_beep: unable to register input device\n"); |
| input_free_device(beep->dev); |
| codec->beep = NULL; |
| kfree(beep); |
| return err; |
| } |
| beep->registered = true; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(snd_hda_register_beep_device); |
| |
| static bool ctl_has_mute(struct snd_kcontrol *kcontrol) |
| { |
| struct hda_codec *codec = snd_kcontrol_chip(kcontrol); |
| return query_amp_caps(codec, get_amp_nid(kcontrol), |
| get_amp_direction(kcontrol)) & AC_AMPCAP_MUTE; |
| } |
| |
| /* get/put callbacks for beep mute mixer switches */ |
| |
| /** |
| * snd_hda_mixer_amp_switch_get_beep - Get callback for beep controls |
| * @kcontrol: ctl element |
| * @ucontrol: pointer to get/store the data |
| */ |
| int snd_hda_mixer_amp_switch_get_beep(struct snd_kcontrol *kcontrol, |
| struct snd_ctl_elem_value *ucontrol) |
| { |
| struct hda_codec *codec = snd_kcontrol_chip(kcontrol); |
| struct hda_beep *beep = codec->beep; |
| if (beep && (!beep->enabled || !ctl_has_mute(kcontrol))) { |
| ucontrol->value.integer.value[0] = |
| ucontrol->value.integer.value[1] = beep->enabled; |
| return 0; |
| } |
| return snd_hda_mixer_amp_switch_get(kcontrol, ucontrol); |
| } |
| EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_get_beep); |
| |
| /** |
| * snd_hda_mixer_amp_switch_put_beep - Put callback for beep controls |
| * @kcontrol: ctl element |
| * @ucontrol: pointer to get/store the data |
| */ |
| int snd_hda_mixer_amp_switch_put_beep(struct snd_kcontrol *kcontrol, |
| struct snd_ctl_elem_value *ucontrol) |
| { |
| struct hda_codec *codec = snd_kcontrol_chip(kcontrol); |
| struct hda_beep *beep = codec->beep; |
| if (beep) { |
| u8 chs = get_amp_channels(kcontrol); |
| int enable = 0; |
| long *valp = ucontrol->value.integer.value; |
| if (chs & 1) { |
| enable |= *valp; |
| valp++; |
| } |
| if (chs & 2) |
| enable |= *valp; |
| snd_hda_enable_beep_device(codec, enable); |
| } |
| if (!ctl_has_mute(kcontrol)) |
| return 0; |
| return snd_hda_mixer_amp_switch_put(kcontrol, ucontrol); |
| } |
| EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_put_beep); |