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/workqueue.h>
25 #include <sound/core.h>
27 #include "hda_local.h"
30 DIGBEEP_HZ_STEP = 46875, /* 46.875 Hz */
31 DIGBEEP_HZ_MIN = 93750, /* 93.750 Hz */
32 DIGBEEP_HZ_MAX = 12000000, /* 12 KHz */
35 static void snd_hda_generate_beep(struct work_struct *work)
37 struct hda_beep *beep =
38 container_of(work, struct hda_beep, beep_work);
39 struct hda_codec *codec = beep->codec;
45 snd_hda_codec_write_cache(codec, beep->nid, 0,
46 AC_VERB_SET_BEEP_CONTROL, beep->tone);
49 /* (non-standard) Linear beep tone calculation for IDT/STAC codecs
51 * The tone frequency of beep generator on IDT/STAC codecs is
52 * defined from the 8bit tone parameter, in Hz,
53 * freq = 48000 * (257 - tone) / 1024
54 * that is from 12kHz to 93.75Hz in steps of 46.875 Hz
56 static int beep_linear_tone(struct hda_beep *beep, int hz)
60 hz *= 1000; /* fixed point */
61 hz = hz - DIGBEEP_HZ_MIN
62 + DIGBEEP_HZ_STEP / 2; /* round to nearest step */
64 hz = 0; /* turn off PC beep*/
65 else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
66 hz = 1; /* max frequency */
68 hz /= DIGBEEP_HZ_STEP;
74 /* HD-audio standard beep tone parameter calculation
76 * The tone frequency in Hz is calculated as
77 * freq = 48000 / (tone * 4)
80 static int beep_standard_tone(struct hda_beep *beep, int hz)
83 return 0; /* disabled */
92 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
93 unsigned int code, int hz)
95 struct hda_beep *beep = input_get_drvdata(dev);
102 if (beep->linear_tone)
103 beep->tone = beep_linear_tone(beep, hz);
105 beep->tone = beep_standard_tone(beep, hz);
111 /* schedule beep event */
112 schedule_work(&beep->beep_work);
116 static void snd_hda_do_detach(struct hda_beep *beep)
118 input_unregister_device(beep->dev);
120 cancel_work_sync(&beep->beep_work);
121 /* turn off beep for sure */
122 snd_hda_codec_write_cache(beep->codec, beep->nid, 0,
123 AC_VERB_SET_BEEP_CONTROL, 0);
126 static int snd_hda_do_attach(struct hda_beep *beep)
128 struct input_dev *input_dev;
129 struct hda_codec *codec = beep->codec;
132 input_dev = input_allocate_device();
134 printk(KERN_INFO "hda_beep: unable to allocate input device\n");
138 /* setup digital beep device */
139 input_dev->name = "HDA Digital PCBeep";
140 input_dev->phys = beep->phys;
141 input_dev->id.bustype = BUS_PCI;
143 input_dev->id.vendor = codec->vendor_id >> 16;
144 input_dev->id.product = codec->vendor_id & 0xffff;
145 input_dev->id.version = 0x01;
147 input_dev->evbit[0] = BIT_MASK(EV_SND);
148 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
149 input_dev->event = snd_hda_beep_event;
150 input_dev->dev.parent = &codec->bus->pci->dev;
151 input_set_drvdata(input_dev, beep);
153 err = input_register_device(input_dev);
155 input_free_device(input_dev);
156 printk(KERN_INFO "hda_beep: unable to register input device\n");
159 beep->dev = input_dev;
163 static void snd_hda_do_register(struct work_struct *work)
165 struct hda_beep *beep =
166 container_of(work, struct hda_beep, register_work);
168 mutex_lock(&beep->mutex);
169 if (beep->enabled && !beep->dev)
170 snd_hda_do_attach(beep);
171 mutex_unlock(&beep->mutex);
174 static void snd_hda_do_unregister(struct work_struct *work)
176 struct hda_beep *beep =
177 container_of(work, struct hda_beep, unregister_work.work);
179 mutex_lock(&beep->mutex);
180 if (!beep->enabled && beep->dev)
181 snd_hda_do_detach(beep);
182 mutex_unlock(&beep->mutex);
185 int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
187 struct hda_beep *beep = codec->beep;
191 if (beep->enabled != enable) {
192 beep->enabled = enable;
194 cancel_delayed_work(&beep->unregister_work);
195 schedule_work(&beep->register_work);
198 snd_hda_codec_write_cache(beep->codec, beep->nid, 0,
199 AC_VERB_SET_BEEP_CONTROL, 0);
200 schedule_delayed_work(&beep->unregister_work, HZ);
206 EXPORT_SYMBOL_HDA(snd_hda_enable_beep_device);
208 int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
210 struct hda_beep *beep;
212 if (!snd_hda_get_bool_hint(codec, "beep"))
213 return 0; /* disabled explicitly */
215 beep = kzalloc(sizeof(*beep), GFP_KERNEL);
218 snprintf(beep->phys, sizeof(beep->phys),
219 "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr);
220 /* enable linear scale */
221 snd_hda_codec_write(codec, nid, 0,
222 AC_VERB_SET_DIGI_CONVERT_2, 0x01);
228 INIT_WORK(&beep->register_work, &snd_hda_do_register);
229 INIT_DELAYED_WORK(&beep->unregister_work, &snd_hda_do_unregister);
230 INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
231 mutex_init(&beep->mutex);
235 EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device);
237 void snd_hda_detach_beep_device(struct hda_codec *codec)
239 struct hda_beep *beep = codec->beep;
241 cancel_work_sync(&beep->register_work);
242 cancel_delayed_work(&beep->unregister_work);
244 snd_hda_do_detach(beep);
249 EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device);