source: GPL/trunk/alsa-kernel/pci/hda/hda_beep.c@ 587

Last change on this file since 587 was 587, checked in by David Azarewicz, 9 years ago

Rearrange directory structure
rework makefiles
cleanup files
File size: 6.7 KB
Line 
1/*
2 * Digital Beep Input Interface for HD-audio codec
3 *
4 * Author: Matthew Ranostay <mranostay@embeddedalley.com>
5 * Copyright (c) 2008 Embedded Alley Solutions Inc
6 *
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.
11 *
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.
16 *
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
20 */
21
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>
28#include "hda_beep.h"
29#include "hda_local.h"
30
31enum {
32 DIGBEEP_HZ_STEP = 46875, /* 46.875 Hz */
33 DIGBEEP_HZ_MIN = 93750, /* 93.750 Hz */
34 DIGBEEP_HZ_MAX = 12000000, /* 12 KHz */
35};
36
37static void snd_hda_generate_beep(struct work_struct *work)
38{
39 struct hda_beep *beep =
40 container_of(work, struct hda_beep, beep_work);
41 struct hda_codec *codec = beep->codec;
42
43 if (!beep->enabled)
44 return;
45
46 /* generate tone */
47 snd_hda_codec_write(codec, beep->nid, 0,
48 AC_VERB_SET_BEEP_CONTROL, beep->tone);
49}
50
51/* (non-standard) Linear beep tone calculation for IDT/STAC codecs
52 *
53 * The tone frequency of beep generator on IDT/STAC codecs is
54 * defined from the 8bit tone parameter, in Hz,
55 * freq = 48000 * (257 - tone) / 1024
56 * that is from 12kHz to 93.75Hz in steps of 46.875 Hz
57 */
58static int beep_linear_tone(struct hda_beep *beep, int hz)
59{
60 if (hz <= 0)
61 return 0;
62 hz *= 1000; /* fixed point */
63 hz = hz - DIGBEEP_HZ_MIN
64 + DIGBEEP_HZ_STEP / 2; /* round to nearest step */
65 if (hz < 0)
66 hz = 0; /* turn off PC beep*/
67 else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
68 hz = 1; /* max frequency */
69 else {
70 hz /= DIGBEEP_HZ_STEP;
71 hz = 255 - hz;
72 }
73 return hz;
74}
75
76/* HD-audio standard beep tone parameter calculation
77 *
78 * The tone frequency in Hz is calculated as
79 * freq = 48000 / (tone * 4)
80 * from 47Hz to 12kHz
81 */
82static int beep_standard_tone(struct hda_beep *beep, int hz)
83{
84 if (hz <= 0)
85 return 0; /* disabled */
86 hz = 12000 / hz;
87 if (hz > 0xff)
88 return 0xff;
89 if (hz <= 0)
90 return 1;
91 return hz;
92}
93
94static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
95 unsigned int code, int hz)
96{
97 struct hda_beep *beep = input_get_drvdata(dev);
98
99 switch (code) {
100 case SND_BELL:
101 if (hz)
102 hz = 1000;
103 case SND_TONE:
104 if (beep->linear_tone)
105 beep->tone = beep_linear_tone(beep, hz);
106 else
107 beep->tone = beep_standard_tone(beep, hz);
108 break;
109 default:
110 return -1;
111 }
112
113 /* schedule beep event */
114 schedule_work(&beep->beep_work);
115 return 0;
116}
117
118static void snd_hda_do_detach(struct hda_beep *beep)
119{
120 input_unregister_device(beep->dev);
121 beep->dev = NULL;
122 cancel_work_sync(&beep->beep_work);
123 /* turn off beep for sure */
124 snd_hda_codec_write(beep->codec, beep->nid, 0,
125 AC_VERB_SET_BEEP_CONTROL, 0);
126}
127
128static int snd_hda_do_attach(struct hda_beep *beep)
129{
130 struct input_dev *input_dev;
131 struct hda_codec *codec = beep->codec;
132 int err;
133
134 input_dev = input_allocate_device();
135 if (!input_dev) {
136 printk(KERN_INFO "hda_beep: unable to allocate input device\n");
137 return -ENOMEM;
138 }
139
140 /* setup digital beep device */
141 input_dev->name = "HDA Digital PCBeep";
142 input_dev->phys = beep->phys;
143 input_dev->id.bustype = BUS_PCI;
144
145 input_dev->id.vendor = codec->vendor_id >> 16;
146 input_dev->id.product = codec->vendor_id & 0xffff;
147 input_dev->id.version = 0x01;
148
149 input_dev->evbit[0] = BIT_MASK(EV_SND);
150 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
151 input_dev->event = snd_hda_beep_event;
152 input_dev->dev.parent = &codec->bus->pci->dev;
153 input_set_drvdata(input_dev, beep);
154
155 err = input_register_device(input_dev);
156 if (err < 0) {
157 input_free_device(input_dev);
158 printk(KERN_INFO "hda_beep: unable to register input device\n");
159 return err;
160 }
161 beep->dev = input_dev;
162 return 0;
163}
164
165static void snd_hda_do_register(struct work_struct *work)
166{
167 struct hda_beep *beep =
168 container_of(work, struct hda_beep, register_work);
169
170 mutex_lock(&beep->mutex);
171 if (beep->enabled && !beep->dev)
172 snd_hda_do_attach(beep);
173 mutex_unlock(&beep->mutex);
174}
175
176static void snd_hda_do_unregister(struct work_struct *work)
177{
178 struct hda_beep *beep =
179 container_of(work, struct hda_beep, unregister_work.work);
180
181 mutex_lock(&beep->mutex);
182 if (!beep->enabled && beep->dev)
183 snd_hda_do_detach(beep);
184 mutex_unlock(&beep->mutex);
185}
186
187int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
188{
189 struct hda_beep *beep = codec->beep;
190 enable = !!enable;
191 if (beep == NULL)
192 return 0;
193 if (beep->enabled != enable) {
194 beep->enabled = enable;
195 if (!enable) {
196 /* turn off beep */
197 snd_hda_codec_write(beep->codec, beep->nid, 0,
198 AC_VERB_SET_BEEP_CONTROL, 0);
199 }
200 if (beep->mode == HDA_BEEP_MODE_SWREG) {
201 if (enable) {
202 cancel_delayed_work(&beep->unregister_work);
203 schedule_work(&beep->register_work);
204 } else {
205 schedule_delayed_work(&beep->unregister_work,
206 HZ);
207 }
208 }
209 return 1;
210 }
211 return 0;
212}
213EXPORT_SYMBOL_HDA(snd_hda_enable_beep_device);
214
215int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
216{
217 struct hda_beep *beep;
218
219 if (!snd_hda_get_bool_hint(codec, "beep"))
220 return 0; /* disabled explicitly by hints */
221 if (codec->beep_mode == HDA_BEEP_MODE_OFF)
222 return 0; /* disabled by module option */
223
224 beep = kzalloc(sizeof(*beep), GFP_KERNEL);
225 if (beep == NULL)
226 return -ENOMEM;
227 snprintf(beep->phys, sizeof(beep->phys),
228 "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr);
229 /* enable linear scale */
230 snd_hda_codec_write(codec, nid, 0,
231 AC_VERB_SET_DIGI_CONVERT_2, 0x01);
232
233 beep->nid = nid;
234 beep->codec = codec;
235 beep->mode = codec->beep_mode;
236 codec->beep = beep;
237
238 INIT_WORK(&beep->register_work, &snd_hda_do_register);
239 INIT_DELAYED_WORK(&beep->unregister_work, &snd_hda_do_unregister);
240 INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
241 mutex_init(&beep->mutex);
242
243 if (beep->mode == HDA_BEEP_MODE_ON) {
244 int err = snd_hda_do_attach(beep);
245 if (err < 0) {
246 kfree(beep);
247 codec->beep = NULL;
248 return err;
249 }
250 }
251
252 return 0;
253}
254EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device);
255
256void snd_hda_detach_beep_device(struct hda_codec *codec)
257{
258 struct hda_beep *beep = codec->beep;
259 if (beep) {
260 cancel_work_sync(&beep->register_work);
261 cancel_delayed_work(&beep->unregister_work);
262 if (beep->dev)
263 snd_hda_do_detach(beep);
264 codec->beep = NULL;
265 kfree(beep);
266 }
267}
268EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device);
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