2 * Digital Beep Input Interface for HD-audio codec
4 * Author: Matthew Ranostay <mranostay@embeddedalley.com>
5 * Copyright (c) 2008 Embedded Alley Solutions Inc
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.
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.
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
22 #include <linux/input.h>
23 #include <linux/slab.h>
24 #include <linux/workqueue.h>
25 #include <linux/export.h>
26 #include <sound/core.h>
28 #include "hda_local.h"
31 DIGBEEP_HZ_STEP = 46875, /* 46.875 Hz */
32 DIGBEEP_HZ_MIN = 93750, /* 93.750 Hz */
33 DIGBEEP_HZ_MAX = 12000000, /* 12 KHz */
36 static void snd_hda_generate_beep(struct work_struct *work)
38 struct hda_beep *beep =
39 container_of(work, struct hda_beep, beep_work);
40 struct hda_codec *codec = beep->codec;
47 if (tone && !beep->playing) {
48 snd_hda_power_up(codec);
52 snd_hda_codec_write(codec, beep->nid, 0,
53 AC_VERB_SET_BEEP_CONTROL, tone);
54 if (!tone && beep->playing) {
56 snd_hda_power_down(codec);
60 /* (non-standard) Linear beep tone calculation for IDT/STAC codecs
62 * The tone frequency of beep generator on IDT/STAC codecs is
63 * defined from the 8bit tone parameter, in Hz,
64 * freq = 48000 * (257 - tone) / 1024
65 * that is from 12kHz to 93.75Hz in steps of 46.875 Hz
67 static int beep_linear_tone(struct hda_beep *beep, int hz)
71 hz *= 1000; /* fixed point */
72 hz = hz - DIGBEEP_HZ_MIN
73 + DIGBEEP_HZ_STEP / 2; /* round to nearest step */
75 hz = 0; /* turn off PC beep*/
76 else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
77 hz = 1; /* max frequency */
79 hz /= DIGBEEP_HZ_STEP;
85 /* HD-audio standard beep tone parameter calculation
87 * The tone frequency in Hz is calculated as
88 * freq = 48000 / (tone * 4)
91 static int beep_standard_tone(struct hda_beep *beep, int hz)
94 return 0; /* disabled */
103 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
104 unsigned int code, int hz)
106 struct hda_beep *beep = input_get_drvdata(dev);
114 if (beep->linear_tone)
115 beep->tone = beep_linear_tone(beep, hz);
117 beep->tone = beep_standard_tone(beep, hz);
123 /* schedule beep event */
124 schedule_work(&beep->beep_work);
128 static void turn_off_beep(struct hda_beep *beep)
130 cancel_work_sync(&beep->beep_work);
133 snd_hda_codec_write(beep->codec, beep->nid, 0,
134 AC_VERB_SET_BEEP_CONTROL, 0);
136 snd_hda_power_down(beep->codec);
140 static void snd_hda_do_detach(struct hda_beep *beep)
142 input_unregister_device(beep->dev);
147 static int snd_hda_do_attach(struct hda_beep *beep)
149 struct input_dev *input_dev;
150 struct hda_codec *codec = beep->codec;
153 input_dev = input_allocate_device();
157 /* setup digital beep device */
158 input_dev->name = "HDA Digital PCBeep";
159 input_dev->phys = beep->phys;
160 input_dev->id.bustype = BUS_PCI;
162 input_dev->id.vendor = codec->vendor_id >> 16;
163 input_dev->id.product = codec->vendor_id & 0xffff;
164 input_dev->id.version = 0x01;
166 input_dev->evbit[0] = BIT_MASK(EV_SND);
167 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
168 input_dev->event = snd_hda_beep_event;
169 input_dev->dev.parent = codec->bus->card->dev;
170 input_set_drvdata(input_dev, beep);
172 err = input_register_device(input_dev);
174 input_free_device(input_dev);
175 printk(KERN_INFO "hda_beep: unable to register input device\n");
178 beep->dev = input_dev;
182 int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
184 struct hda_beep *beep = codec->beep;
188 if (beep->enabled != enable) {
189 beep->enabled = enable;
196 EXPORT_SYMBOL_GPL(snd_hda_enable_beep_device);
198 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
200 struct hda_beep *beep;
203 if (!snd_hda_get_bool_hint(codec, "beep"))
204 return 0; /* disabled explicitly by hints */
205 if (codec->beep_mode == HDA_BEEP_MODE_OFF)
206 return 0; /* disabled by module option */
208 beep = kzalloc(sizeof(*beep), GFP_KERNEL);
211 snprintf(beep->phys, sizeof(beep->phys),
212 "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr);
213 /* enable linear scale */
214 snd_hda_codec_write_cache(codec, nid, 0,
215 AC_VERB_SET_DIGI_CONVERT_2, 0x01);
221 INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
222 mutex_init(&beep->mutex);
224 err = snd_hda_do_attach(beep);
233 EXPORT_SYMBOL_GPL(snd_hda_attach_beep_device);
235 void snd_hda_detach_beep_device(struct hda_codec *codec)
237 struct hda_beep *beep = codec->beep;
240 snd_hda_do_detach(beep);
245 EXPORT_SYMBOL_GPL(snd_hda_detach_beep_device);
247 static bool ctl_has_mute(struct snd_kcontrol *kcontrol)
249 struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
250 return query_amp_caps(codec, get_amp_nid(kcontrol),
251 get_amp_direction(kcontrol)) & AC_AMPCAP_MUTE;
254 /* get/put callbacks for beep mute mixer switches */
255 int snd_hda_mixer_amp_switch_get_beep(struct snd_kcontrol *kcontrol,
256 struct snd_ctl_elem_value *ucontrol)
258 struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
259 struct hda_beep *beep = codec->beep;
260 if (beep && (!beep->enabled || !ctl_has_mute(kcontrol))) {
261 ucontrol->value.integer.value[0] =
262 ucontrol->value.integer.value[1] = beep->enabled;
265 return snd_hda_mixer_amp_switch_get(kcontrol, ucontrol);
267 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_get_beep);
269 int snd_hda_mixer_amp_switch_put_beep(struct snd_kcontrol *kcontrol,
270 struct snd_ctl_elem_value *ucontrol)
272 struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
273 struct hda_beep *beep = codec->beep;
275 u8 chs = get_amp_channels(kcontrol);
277 long *valp = ucontrol->value.integer.value;
284 snd_hda_enable_beep_device(codec, enable);
286 if (!ctl_has_mute(kcontrol))
288 return snd_hda_mixer_amp_switch_put(kcontrol, ucontrol);
290 EXPORT_SYMBOL_GPL(snd_hda_mixer_amp_switch_put_beep);