2 * Copyright (C) 2005-2006 Micronas USA Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License (Version 2) as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/moduleparam.h>
17 #include <linux/spinlock.h>
18 #include <linux/delay.h>
19 #include <linux/sched.h>
20 #include <linux/vmalloc.h>
21 #include <linux/time.h>
23 #include <linux/i2c.h>
24 #include <linux/mutex.h>
25 #include <linux/uaccess.h>
26 #include <linux/slab.h>
27 #include <sound/core.h>
28 #include <sound/pcm.h>
29 #include <sound/initval.h>
31 #include "go7007-priv.h"
33 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
34 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
35 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
37 module_param_array(index, int, NULL, 0444);
38 module_param_array(id, charp, NULL, 0444);
39 module_param_array(enable, bool, NULL, 0444);
40 MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");
41 MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");
42 MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");
45 struct snd_card *card;
47 struct snd_pcm_substream *substream;
55 static struct snd_pcm_hardware go7007_snd_capture_hw = {
56 .info = (SNDRV_PCM_INFO_MMAP |
57 SNDRV_PCM_INFO_INTERLEAVED |
58 SNDRV_PCM_INFO_BLOCK_TRANSFER |
59 SNDRV_PCM_INFO_MMAP_VALID),
60 .formats = SNDRV_PCM_FMTBIT_S16_LE,
61 .rates = SNDRV_PCM_RATE_48000,
66 .buffer_bytes_max = (128*1024),
67 .period_bytes_min = 4096,
68 .period_bytes_max = (128*1024),
73 static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
75 struct go7007_snd *gosnd = go->snd_context;
76 struct snd_pcm_runtime *runtime = gosnd->substream->runtime;
77 int frames = bytes_to_frames(runtime, length);
79 spin_lock(&gosnd->lock);
80 gosnd->hw_ptr += frames;
81 if (gosnd->hw_ptr >= runtime->buffer_size)
82 gosnd->hw_ptr -= runtime->buffer_size;
83 gosnd->avail += frames;
84 spin_unlock(&gosnd->lock);
85 if (gosnd->w_idx + length > runtime->dma_bytes) {
86 int cpy = runtime->dma_bytes - gosnd->w_idx;
88 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
93 memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
94 gosnd->w_idx += length;
95 spin_lock(&gosnd->lock);
96 if (gosnd->avail < runtime->period_size) {
97 spin_unlock(&gosnd->lock);
100 gosnd->avail -= runtime->period_size;
101 spin_unlock(&gosnd->lock);
102 if (gosnd->capturing)
103 snd_pcm_period_elapsed(gosnd->substream);
106 static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
107 struct snd_pcm_hw_params *hw_params)
109 struct go7007 *go = snd_pcm_substream_chip(substream);
112 bytes = params_buffer_bytes(hw_params);
113 if (substream->runtime->dma_bytes > 0)
114 vfree(substream->runtime->dma_area);
115 substream->runtime->dma_bytes = 0;
116 substream->runtime->dma_area = vmalloc(bytes);
117 if (substream->runtime->dma_area == NULL)
119 substream->runtime->dma_bytes = bytes;
120 go->audio_deliver = parse_audio_stream_data;
124 static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
126 struct go7007 *go = snd_pcm_substream_chip(substream);
128 go->audio_deliver = NULL;
129 if (substream->runtime->dma_bytes > 0)
130 vfree(substream->runtime->dma_area);
131 substream->runtime->dma_bytes = 0;
135 static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
137 struct go7007 *go = snd_pcm_substream_chip(substream);
138 struct go7007_snd *gosnd = go->snd_context;
142 spin_lock_irqsave(&gosnd->lock, flags);
143 if (gosnd->substream == NULL) {
144 gosnd->substream = substream;
145 substream->runtime->hw = go7007_snd_capture_hw;
149 spin_unlock_irqrestore(&gosnd->lock, flags);
153 static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
155 struct go7007 *go = snd_pcm_substream_chip(substream);
156 struct go7007_snd *gosnd = go->snd_context;
158 gosnd->substream = NULL;
162 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
167 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
169 struct go7007 *go = snd_pcm_substream_chip(substream);
170 struct go7007_snd *gosnd = go->snd_context;
173 case SNDRV_PCM_TRIGGER_START:
174 /* Just set a flag to indicate we should signal ALSA when
176 gosnd->capturing = 1;
178 case SNDRV_PCM_TRIGGER_STOP:
179 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
180 gosnd->capturing = 0;
187 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
189 struct go7007 *go = snd_pcm_substream_chip(substream);
190 struct go7007_snd *gosnd = go->snd_context;
192 return gosnd->hw_ptr;
195 static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream,
196 unsigned long offset)
198 return vmalloc_to_page(substream->runtime->dma_area + offset);
201 static const struct snd_pcm_ops go7007_snd_capture_ops = {
202 .open = go7007_snd_capture_open,
203 .close = go7007_snd_capture_close,
204 .ioctl = snd_pcm_lib_ioctl,
205 .hw_params = go7007_snd_hw_params,
206 .hw_free = go7007_snd_hw_free,
207 .prepare = go7007_snd_pcm_prepare,
208 .trigger = go7007_snd_pcm_trigger,
209 .pointer = go7007_snd_pcm_pointer,
210 .page = go7007_snd_pcm_page,
213 static int go7007_snd_free(struct snd_device *device)
215 struct go7007 *go = device->device_data;
217 kfree(go->snd_context);
218 go->snd_context = NULL;
222 static struct snd_device_ops go7007_snd_device_ops = {
223 .dev_free = go7007_snd_free,
226 int go7007_snd_init(struct go7007 *go)
229 struct go7007_snd *gosnd;
232 if (dev >= SNDRV_CARDS)
238 gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
241 spin_lock_init(&gosnd->lock);
242 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
243 gosnd->capturing = 0;
244 ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0,
249 ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
250 &go7007_snd_device_ops);
254 ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
258 strlcpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
259 strlcpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver));
260 strlcpy(gosnd->card->longname, gosnd->card->shortname,
261 sizeof(gosnd->card->longname));
263 gosnd->pcm->private_data = go;
264 snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
265 &go7007_snd_capture_ops);
267 ret = snd_card_register(gosnd->card);
271 gosnd->substream = NULL;
272 go->snd_context = gosnd;
273 v4l2_device_get(&go->v4l2_dev);
279 snd_card_free(gosnd->card);
284 EXPORT_SYMBOL(go7007_snd_init);
286 int go7007_snd_remove(struct go7007 *go)
288 struct go7007_snd *gosnd = go->snd_context;
290 snd_card_disconnect(gosnd->card);
291 snd_card_free_when_closed(gosnd->card);
292 v4l2_device_put(&go->v4l2_dev);
295 EXPORT_SYMBOL(go7007_snd_remove);
297 MODULE_LICENSE("GPL v2");