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 const 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);
80 spin_lock_irqsave(&gosnd->lock, flags);
81 gosnd->hw_ptr += frames;
82 if (gosnd->hw_ptr >= runtime->buffer_size)
83 gosnd->hw_ptr -= runtime->buffer_size;
84 gosnd->avail += frames;
85 spin_unlock_irqrestore(&gosnd->lock, flags);
86 if (gosnd->w_idx + length > runtime->dma_bytes) {
87 int cpy = runtime->dma_bytes - gosnd->w_idx;
89 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
94 memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
95 gosnd->w_idx += length;
96 spin_lock_irqsave(&gosnd->lock, flags);
97 if (gosnd->avail < runtime->period_size) {
98 spin_unlock_irqrestore(&gosnd->lock, flags);
101 gosnd->avail -= runtime->period_size;
102 spin_unlock_irqrestore(&gosnd->lock, flags);
103 if (gosnd->capturing)
104 snd_pcm_period_elapsed(gosnd->substream);
107 static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
108 struct snd_pcm_hw_params *hw_params)
110 struct go7007 *go = snd_pcm_substream_chip(substream);
113 bytes = params_buffer_bytes(hw_params);
114 if (substream->runtime->dma_bytes > 0)
115 vfree(substream->runtime->dma_area);
116 substream->runtime->dma_bytes = 0;
117 substream->runtime->dma_area = vmalloc(bytes);
118 if (substream->runtime->dma_area == NULL)
120 substream->runtime->dma_bytes = bytes;
121 go->audio_deliver = parse_audio_stream_data;
125 static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
127 struct go7007 *go = snd_pcm_substream_chip(substream);
129 go->audio_deliver = NULL;
130 if (substream->runtime->dma_bytes > 0)
131 vfree(substream->runtime->dma_area);
132 substream->runtime->dma_bytes = 0;
136 static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
138 struct go7007 *go = snd_pcm_substream_chip(substream);
139 struct go7007_snd *gosnd = go->snd_context;
143 spin_lock_irqsave(&gosnd->lock, flags);
144 if (gosnd->substream == NULL) {
145 gosnd->substream = substream;
146 substream->runtime->hw = go7007_snd_capture_hw;
150 spin_unlock_irqrestore(&gosnd->lock, flags);
154 static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
156 struct go7007 *go = snd_pcm_substream_chip(substream);
157 struct go7007_snd *gosnd = go->snd_context;
159 gosnd->substream = NULL;
163 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
168 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
170 struct go7007 *go = snd_pcm_substream_chip(substream);
171 struct go7007_snd *gosnd = go->snd_context;
174 case SNDRV_PCM_TRIGGER_START:
175 /* Just set a flag to indicate we should signal ALSA when
177 gosnd->capturing = 1;
179 case SNDRV_PCM_TRIGGER_STOP:
180 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
181 gosnd->capturing = 0;
188 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
190 struct go7007 *go = snd_pcm_substream_chip(substream);
191 struct go7007_snd *gosnd = go->snd_context;
193 return gosnd->hw_ptr;
196 static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream,
197 unsigned long offset)
199 return vmalloc_to_page(substream->runtime->dma_area + offset);
202 static const struct snd_pcm_ops go7007_snd_capture_ops = {
203 .open = go7007_snd_capture_open,
204 .close = go7007_snd_capture_close,
205 .ioctl = snd_pcm_lib_ioctl,
206 .hw_params = go7007_snd_hw_params,
207 .hw_free = go7007_snd_hw_free,
208 .prepare = go7007_snd_pcm_prepare,
209 .trigger = go7007_snd_pcm_trigger,
210 .pointer = go7007_snd_pcm_pointer,
211 .page = go7007_snd_pcm_page,
214 static int go7007_snd_free(struct snd_device *device)
216 struct go7007 *go = device->device_data;
218 kfree(go->snd_context);
219 go->snd_context = NULL;
223 static struct snd_device_ops go7007_snd_device_ops = {
224 .dev_free = go7007_snd_free,
227 int go7007_snd_init(struct go7007 *go)
230 struct go7007_snd *gosnd;
233 if (dev >= SNDRV_CARDS)
239 gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
242 spin_lock_init(&gosnd->lock);
243 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
244 gosnd->capturing = 0;
245 ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0,
250 ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
251 &go7007_snd_device_ops);
255 ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
259 strlcpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
260 strlcpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver));
261 strlcpy(gosnd->card->longname, gosnd->card->shortname,
262 sizeof(gosnd->card->longname));
264 gosnd->pcm->private_data = go;
265 snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
266 &go7007_snd_capture_ops);
268 ret = snd_card_register(gosnd->card);
272 gosnd->substream = NULL;
273 go->snd_context = gosnd;
274 v4l2_device_get(&go->v4l2_dev);
280 snd_card_free(gosnd->card);
285 EXPORT_SYMBOL(go7007_snd_init);
287 int go7007_snd_remove(struct go7007 *go)
289 struct go7007_snd *gosnd = go->snd_context;
291 snd_card_disconnect(gosnd->card);
292 snd_card_free_when_closed(gosnd->card);
293 v4l2_device_put(&go->v4l2_dev);
296 EXPORT_SYMBOL(go7007_snd_remove);
298 MODULE_LICENSE("GPL v2");