forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 4
/
beep.c
275 lines (244 loc) · 7.1 KB
/
beep.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Beep using pcm
*
* Copyright (c) by Takashi Iwai <[email protected]>
*/
#include <linux/io.h>
#include <asm/irq.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <sound/core.h>
#include <sound/control.h>
#include "pmac.h"
struct pmac_beep {
int running; /* boolean */
int volume; /* mixer volume: 0-100 */
int volume_play; /* currently playing volume */
int hz;
int nsamples;
short *buf; /* allocated wave buffer */
dma_addr_t addr; /* physical address of buffer */
struct input_dev *dev;
};
/*
* stop beep if running
*/
void snd_pmac_beep_stop(struct snd_pmac *chip)
{
struct pmac_beep *beep = chip->beep;
if (beep && beep->running) {
beep->running = 0;
snd_pmac_beep_dma_stop(chip);
}
}
/*
* Stuff for outputting a beep. The values range from -327 to +327
* so we can multiply by an amplitude in the range 0..100 to get a
* signed short value to put in the output buffer.
*/
static const short beep_wform[256] = {
0, 40, 79, 117, 153, 187, 218, 245,
269, 288, 304, 316, 323, 327, 327, 324,
318, 310, 299, 288, 275, 262, 249, 236,
224, 213, 204, 196, 190, 186, 183, 182,
182, 183, 186, 189, 192, 196, 200, 203,
206, 208, 209, 209, 209, 207, 204, 201,
197, 193, 188, 183, 179, 174, 170, 166,
163, 161, 160, 159, 159, 160, 161, 162,
164, 166, 168, 169, 171, 171, 171, 170,
169, 167, 163, 159, 155, 150, 144, 139,
133, 128, 122, 117, 113, 110, 107, 105,
103, 103, 103, 103, 104, 104, 105, 105,
105, 103, 101, 97, 92, 86, 78, 68,
58, 45, 32, 18, 3, -11, -26, -41,
-55, -68, -79, -88, -95, -100, -102, -102,
-99, -93, -85, -75, -62, -48, -33, -16,
0, 16, 33, 48, 62, 75, 85, 93,
99, 102, 102, 100, 95, 88, 79, 68,
55, 41, 26, 11, -3, -18, -32, -45,
-58, -68, -78, -86, -92, -97, -101, -103,
-105, -105, -105, -104, -104, -103, -103, -103,
-103, -105, -107, -110, -113, -117, -122, -128,
-133, -139, -144, -150, -155, -159, -163, -167,
-169, -170, -171, -171, -171, -169, -168, -166,
-164, -162, -161, -160, -159, -159, -160, -161,
-163, -166, -170, -174, -179, -183, -188, -193,
-197, -201, -204, -207, -209, -209, -209, -208,
-206, -203, -200, -196, -192, -189, -186, -183,
-182, -182, -183, -186, -190, -196, -204, -213,
-224, -236, -249, -262, -275, -288, -299, -310,
-318, -324, -327, -327, -323, -316, -304, -288,
-269, -245, -218, -187, -153, -117, -79, -40,
};
#define BEEP_SRATE 22050 /* 22050 Hz sample rate */
#define BEEP_BUFLEN 512
#define BEEP_VOLUME 15 /* 0 - 100 */
static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type,
unsigned int code, int hz)
{
struct snd_pmac *chip;
struct pmac_beep *beep;
unsigned long flags;
int beep_speed = 0;
int srate;
int period, ncycles, nsamples;
int i, j, f;
short *p;
if (type != EV_SND)
return -1;
switch (code) {
case SND_BELL: if (hz) hz = 1000; break;
case SND_TONE: break;
default: return -1;
}
chip = input_get_drvdata(dev);
if (!chip)
return -1;
beep = chip->beep;
if (!beep)
return -1;
if (! hz) {
spin_lock_irqsave(&chip->reg_lock, flags);
if (beep->running)
snd_pmac_beep_stop(chip);
spin_unlock_irqrestore(&chip->reg_lock, flags);
return 0;
}
beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE);
srate = chip->freq_table[beep_speed];
if (hz <= srate / BEEP_BUFLEN || hz > srate / 2)
hz = 1000;
spin_lock_irqsave(&chip->reg_lock, flags);
if (chip->playback.running || chip->capture.running || beep->running) {
spin_unlock_irqrestore(&chip->reg_lock, flags);
return 0;
}
beep->running = 1;
spin_unlock_irqrestore(&chip->reg_lock, flags);
if (hz == beep->hz && beep->volume == beep->volume_play) {
nsamples = beep->nsamples;
} else {
period = srate * 256 / hz; /* fixed point */
ncycles = BEEP_BUFLEN * 256 / period;
nsamples = (period * ncycles) >> 8;
f = ncycles * 65536 / nsamples;
j = 0;
p = beep->buf;
for (i = 0; i < nsamples; ++i, p += 2) {
p[0] = p[1] = beep_wform[j >> 8] * beep->volume;
j = (j + f) & 0xffff;
}
beep->hz = hz;
beep->volume_play = beep->volume;
beep->nsamples = nsamples;
}
spin_lock_irqsave(&chip->reg_lock, flags);
snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed);
spin_unlock_irqrestore(&chip->reg_lock, flags);
return 0;
}
/*
* beep volume mixer
*/
static int snd_pmac_info_beep(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 1;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = 100;
return 0;
}
static int snd_pmac_get_beep(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
if (snd_BUG_ON(!chip->beep))
return -ENXIO;
ucontrol->value.integer.value[0] = chip->beep->volume;
return 0;
}
static int snd_pmac_put_beep(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
unsigned int oval, nval;
if (snd_BUG_ON(!chip->beep))
return -ENXIO;
oval = chip->beep->volume;
nval = ucontrol->value.integer.value[0];
if (nval > 100)
return -EINVAL;
chip->beep->volume = nval;
return oval != chip->beep->volume;
}
static const struct snd_kcontrol_new snd_pmac_beep_mixer = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "Beep Playback Volume",
.info = snd_pmac_info_beep,
.get = snd_pmac_get_beep,
.put = snd_pmac_put_beep,
};
/* Initialize beep stuff */
int snd_pmac_attach_beep(struct snd_pmac *chip)
{
struct pmac_beep *beep;
struct input_dev *input_dev;
struct snd_kcontrol *beep_ctl;
void *dmabuf;
int err = -ENOMEM;
beep = kzalloc(sizeof(*beep), GFP_KERNEL);
if (! beep)
return -ENOMEM;
dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
&beep->addr, GFP_KERNEL);
input_dev = input_allocate_device();
if (! dmabuf || ! input_dev)
goto fail1;
/* FIXME: set more better values */
input_dev->name = "PowerMac Beep";
input_dev->phys = "powermac/beep";
input_dev->id.bustype = BUS_ADB;
input_dev->id.vendor = 0x001f;
input_dev->id.product = 0x0001;
input_dev->id.version = 0x0100;
input_dev->evbit[0] = BIT_MASK(EV_SND);
input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
input_dev->event = snd_pmac_beep_event;
input_dev->dev.parent = &chip->pdev->dev;
input_set_drvdata(input_dev, chip);
beep->dev = input_dev;
beep->buf = dmabuf;
beep->volume = BEEP_VOLUME;
beep->running = 0;
beep_ctl = snd_ctl_new1(&snd_pmac_beep_mixer, chip);
err = snd_ctl_add(chip->card, beep_ctl);
if (err < 0)
goto fail1;
chip->beep = beep;
err = input_register_device(beep->dev);
if (err)
goto fail2;
return 0;
fail2: snd_ctl_remove(chip->card, beep_ctl);
fail1: input_free_device(input_dev);
if (dmabuf)
dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
dmabuf, beep->addr);
kfree(beep);
return err;
}
void snd_pmac_detach_beep(struct snd_pmac *chip)
{
if (chip->beep) {
input_unregister_device(chip->beep->dev);
dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
chip->beep->buf, chip->beep->addr);
kfree(chip->beep);
chip->beep = NULL;
}
}