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/pci.h>
24 #include <linux/slab.h>
25 #include <linux/workqueue.h>
26 #include <linux/export.h>
27 #include <sound/core.h>
29 #include "hda_local.h"
32 DIGBEEP_HZ_STEP = 46875, /* 46.875 Hz */
33 DIGBEEP_HZ_MIN = 93750, /* 93.750 Hz */
34 DIGBEEP_HZ_MAX = 12000000, /* 12 KHz */
37 static void snd_hda_generate_beep(struct work_struct *work)
39 struct hda_beep *beep =
40 container_of(work, struct hda_beep, beep_work);
41 struct hda_codec *codec = beep->codec;
48 if (tone && !beep->playing) {
49 snd_hda_power_up(codec);
53 snd_hda_codec_write(codec, beep->nid, 0,
54 AC_VERB_SET_BEEP_CONTROL, tone);
55 if (!tone && beep->playing) {
57 snd_hda_power_down(codec);
61 /* (non-standard) Linear beep tone calculation for IDT/STAC codecs
63 * The tone frequency of beep generator on IDT/STAC codecs is
64 * defined from the 8bit tone parameter, in Hz,
65 * freq = 48000 * (257 - tone) / 1024
66 * that is from 12kHz to 93.75Hz in steps of 46.875 Hz
68 static int beep_linear_tone(struct hda_beep *beep, int hz)
72 hz *= 1000; /* fixed point */
73 hz = hz - DIGBEEP_HZ_MIN
74 + DIGBEEP_HZ_STEP / 2; /* round to nearest step */
76 hz = 0; /* turn off PC beep*/
77 else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
78 hz = 1; /* max frequency */
80 hz /= DIGBEEP_HZ_STEP;
86 /* HD-audio standard beep tone parameter calculation
88 * The tone frequency in Hz is calculated as
89 * freq = 48000 / (tone * 4)
92 static int beep_standard_tone(struct hda_beep *beep, int hz)
95 return 0; /* disabled */
104 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
105 unsigned int code, int hz)
107 struct hda_beep *beep = input_get_drvdata(dev);
115 if (beep->linear_tone)
116 beep->tone = beep_linear_tone(beep, hz);
118 beep->tone = beep_standard_tone(beep, hz);
124 /* schedule beep event */
125 schedule_work(&beep->beep_work);
129 static void turn_off_beep(struct hda_beep *beep)
131 cancel_work_sync(&beep->beep_work);
134 snd_hda_codec_write(beep->codec, beep->nid, 0,
135 AC_VERB_SET_BEEP_CONTROL, 0);
137 snd_hda_power_down(beep->codec);
141 static void snd_hda_do_detach(struct hda_beep *beep)
143 input_unregister_device(beep->dev);
148 static int snd_hda_do_attach(struct hda_beep *beep)
150 struct input_dev *input_dev;
151 struct hda_codec *codec = beep->codec;
154 input_dev = input_allocate_device();
158 /* setup digital beep device */
159 input_dev->name = "HDA Digital PCBeep";
160 input_dev->phys = beep->phys;
161 input_dev->id.bustype = BUS_PCI;
163 input_dev->id.vendor = codec->vendor_id >> 16;
164 input_dev->id.product = codec->vendor_id & 0xffff;
165 input_dev->id.version = 0x01;
167 input_dev->evbit[0] = BIT_MASK(EV_SND);
168 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
169 input_dev->event = snd_hda_beep_event;
170 input_dev->dev.parent = &codec->bus->pci->dev;
171 input_set_drvdata(input_dev, beep);
173 err = input_register_device(input_dev);
175 input_free_device(input_dev);
176 printk(KERN_INFO "hda_beep: unable to register input device\n");
179 beep->dev = input_dev;
183 int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
185 struct hda_beep *beep = codec->beep;
189 if (beep->enabled != enable) {
190 beep->enabled = enable;
197 EXPORT_SYMBOL_HDA(snd_hda_enable_beep_device);
199 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
201 struct hda_beep *beep;
204 if (!snd_hda_get_bool_hint(codec, "beep"))
205 return 0; /* disabled explicitly by hints */
206 if (codec->beep_mode == HDA_BEEP_MODE_OFF)
207 return 0; /* disabled by module option */
209 beep = kzalloc(sizeof(*beep), GFP_KERNEL);
212 snprintf(beep->phys, sizeof(beep->phys),
213 "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr);
214 /* enable linear scale */
215 snd_hda_codec_write_cache(codec, nid, 0,
216 AC_VERB_SET_DIGI_CONVERT_2, 0x01);
222 INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
223 mutex_init(&beep->mutex);
225 err = snd_hda_do_attach(beep);
234 EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device);
236 void snd_hda_detach_beep_device(struct hda_codec *codec)
238 struct hda_beep *beep = codec->beep;
241 snd_hda_do_detach(beep);
246 EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device);
248 static bool ctl_has_mute(struct snd_kcontrol *kcontrol)
250 struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
251 return query_amp_caps(codec, get_amp_nid(kcontrol),
252 get_amp_direction(kcontrol)) & AC_AMPCAP_MUTE;
255 /* get/put callbacks for beep mute mixer switches */
256 int snd_hda_mixer_amp_switch_get_beep(struct snd_kcontrol *kcontrol,
257 struct snd_ctl_elem_value *ucontrol)
259 struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
260 struct hda_beep *beep = codec->beep;
261 if (beep && (!beep->enabled || !ctl_has_mute(kcontrol))) {
262 ucontrol->value.integer.value[0] =
263 ucontrol->value.integer.value[1] = beep->enabled;
266 return snd_hda_mixer_amp_switch_get(kcontrol, ucontrol);
268 EXPORT_SYMBOL_HDA(snd_hda_mixer_amp_switch_get_beep);
270 int snd_hda_mixer_amp_switch_put_beep(struct snd_kcontrol *kcontrol,
271 struct snd_ctl_elem_value *ucontrol)
273 struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
274 struct hda_beep *beep = codec->beep;
276 u8 chs = get_amp_channels(kcontrol);
278 long *valp = ucontrol->value.integer.value;
285 snd_hda_enable_beep_device(codec, enable);
287 if (!ctl_has_mute(kcontrol))
289 return snd_hda_mixer_amp_switch_put(kcontrol, ucontrol);
291 EXPORT_SYMBOL_HDA(snd_hda_mixer_amp_switch_put_beep);