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
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
|
/*
* Copyright (C) 2005-2006 Micronas USA Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include "go7007-priv.h"
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
module_param_array(index, int, NULL, 0444);
module_param_array(id, charp, NULL, 0444);
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");
MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");
MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");
struct go7007_snd {
struct snd_card *card;
struct snd_pcm *pcm;
struct snd_pcm_substream *substream;
spinlock_t lock;
int w_idx;
int hw_ptr;
int avail;
int capturing;
};
static const struct snd_pcm_hardware go7007_snd_capture_hw = {
.info = (SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP_VALID),
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.rates = SNDRV_PCM_RATE_48000,
.rate_min = 48000,
.rate_max = 48000,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = (128*1024),
.period_bytes_min = 4096,
.period_bytes_max = (128*1024),
.periods_min = 1,
.periods_max = 32,
};
static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
{
struct go7007_snd *gosnd = go->snd_context;
struct snd_pcm_runtime *runtime = gosnd->substream->runtime;
int frames = bytes_to_frames(runtime, length);
unsigned long flags;
spin_lock_irqsave(&gosnd->lock, flags);
gosnd->hw_ptr += frames;
if (gosnd->hw_ptr >= runtime->buffer_size)
gosnd->hw_ptr -= runtime->buffer_size;
gosnd->avail += frames;
spin_unlock_irqrestore(&gosnd->lock, flags);
if (gosnd->w_idx + length > runtime->dma_bytes) {
int cpy = runtime->dma_bytes - gosnd->w_idx;
memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
length -= cpy;
buf += cpy;
gosnd->w_idx = 0;
}
memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
gosnd->w_idx += length;
spin_lock_irqsave(&gosnd->lock, flags);
if (gosnd->avail < runtime->period_size) {
spin_unlock_irqrestore(&gosnd->lock, flags);
return;
}
gosnd->avail -= runtime->period_size;
spin_unlock_irqrestore(&gosnd->lock, flags);
if (gosnd->capturing)
snd_pcm_period_elapsed(gosnd->substream);
}
static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct go7007 *go = snd_pcm_substream_chip(substream);
unsigned int bytes;
bytes = params_buffer_bytes(hw_params);
if (substream->runtime->dma_bytes > 0)
vfree(substream->runtime->dma_area);
substream->runtime->dma_bytes = 0;
substream->runtime->dma_area = vmalloc(bytes);
if (substream->runtime->dma_area == NULL)
return -ENOMEM;
substream->runtime->dma_bytes = bytes;
go->audio_deliver = parse_audio_stream_data;
return 0;
}
static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
{
struct go7007 *go = snd_pcm_substream_chip(substream);
go->audio_deliver = NULL;
if (substream->runtime->dma_bytes > 0)
vfree(substream->runtime->dma_area);
substream->runtime->dma_bytes = 0;
return 0;
}
static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
{
struct go7007 *go = snd_pcm_substream_chip(substream);
struct go7007_snd *gosnd = go->snd_context;
unsigned long flags;
int r;
spin_lock_irqsave(&gosnd->lock, flags);
if (gosnd->substream == NULL) {
gosnd->substream = substream;
substream->runtime->hw = go7007_snd_capture_hw;
r = 0;
} else
r = -EBUSY;
spin_unlock_irqrestore(&gosnd->lock, flags);
return r;
}
static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
{
struct go7007 *go = snd_pcm_substream_chip(substream);
struct go7007_snd *gosnd = go->snd_context;
gosnd->substream = NULL;
return 0;
}
static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
{
return 0;
}
static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct go7007 *go = snd_pcm_substream_chip(substream);
struct go7007_snd *gosnd = go->snd_context;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
/* Just set a flag to indicate we should signal ALSA when
* sound comes in */
gosnd->capturing = 1;
return 0;
case SNDRV_PCM_TRIGGER_STOP:
gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
gosnd->capturing = 0;
return 0;
default:
return -EINVAL;
}
}
static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
{
struct go7007 *go = snd_pcm_substream_chip(substream);
struct go7007_snd *gosnd = go->snd_context;
return gosnd->hw_ptr;
}
static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream,
unsigned long offset)
{
return vmalloc_to_page(substream->runtime->dma_area + offset);
}
static const struct snd_pcm_ops go7007_snd_capture_ops = {
.open = go7007_snd_capture_open,
.close = go7007_snd_capture_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = go7007_snd_hw_params,
.hw_free = go7007_snd_hw_free,
.prepare = go7007_snd_pcm_prepare,
.trigger = go7007_snd_pcm_trigger,
.pointer = go7007_snd_pcm_pointer,
.page = go7007_snd_pcm_page,
};
static int go7007_snd_free(struct snd_device *device)
{
struct go7007 *go = device->device_data;
kfree(go->snd_context);
go->snd_context = NULL;
return 0;
}
static struct snd_device_ops go7007_snd_device_ops = {
.dev_free = go7007_snd_free,
};
int go7007_snd_init(struct go7007 *go)
{
static int dev;
struct go7007_snd *gosnd;
int ret;
if (dev >= SNDRV_CARDS)
return -ENODEV;
if (!enable[dev]) {
dev++;
return -ENOENT;
}
gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
if (gosnd == NULL)
return -ENOMEM;
spin_lock_init(&gosnd->lock);
gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
gosnd->capturing = 0;
ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0,
&gosnd->card);
if (ret < 0) {
kfree(gosnd);
return ret;
}
ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
&go7007_snd_device_ops);
if (ret < 0) {
kfree(gosnd);
return ret;
}
ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
if (ret < 0) {
snd_card_free(gosnd->card);
kfree(gosnd);
return ret;
}
strscpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
strscpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver));
strscpy(gosnd->card->longname, gosnd->card->shortname,
sizeof(gosnd->card->longname));
gosnd->pcm->private_data = go;
snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
&go7007_snd_capture_ops);
ret = snd_card_register(gosnd->card);
if (ret < 0) {
snd_card_free(gosnd->card);
kfree(gosnd);
return ret;
}
gosnd->substream = NULL;
go->snd_context = gosnd;
v4l2_device_get(&go->v4l2_dev);
++dev;
return 0;
}
EXPORT_SYMBOL(go7007_snd_init);
int go7007_snd_remove(struct go7007 *go)
{
struct go7007_snd *gosnd = go->snd_context;
snd_card_disconnect(gosnd->card);
snd_card_free_when_closed(gosnd->card);
v4l2_device_put(&go->v4l2_dev);
return 0;
}
EXPORT_SYMBOL(go7007_snd_remove);
MODULE_LICENSE("GPL v2");
|
