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.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software Foundation,
15 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/version.h>
21 #include <linux/moduleparam.h>
22 #include <linux/init.h>
23 #include <linux/spinlock.h>
24 #include <linux/delay.h>
25 #include <linux/sched.h>
26 #include <linux/vmalloc.h>
27 #include <linux/time.h>
29 #include <linux/i2c.h>
30 #include <linux/semaphore.h>
31 #include <linux/uaccess.h>
32 #include <asm/system.h>
33 #include <sound/core.h>
34 #include <sound/pcm.h>
35 #include <sound/initval.h>
37 #include "go7007-priv.h"
39 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
40 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
41 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
43 module_param_array(index, int, NULL, 0444);
44 module_param_array(id, charp, NULL, 0444);
45 module_param_array(enable, bool, NULL, 0444);
46 MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");
47 MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");
48 MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");
51 struct snd_card *card;
53 struct snd_pcm_substream *substream;
61 static struct snd_pcm_hardware go7007_snd_capture_hw = {
62 .info = (SNDRV_PCM_INFO_MMAP |
63 SNDRV_PCM_INFO_INTERLEAVED |
64 SNDRV_PCM_INFO_BLOCK_TRANSFER |
65 SNDRV_PCM_INFO_MMAP_VALID),
66 .formats = SNDRV_PCM_FMTBIT_S16_LE,
67 .rates = SNDRV_PCM_RATE_48000,
72 .buffer_bytes_max = (128*1024),
73 .period_bytes_min = 4096,
74 .period_bytes_max = (128*1024),
79 static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
81 struct go7007_snd *gosnd = go->snd_context;
82 struct snd_pcm_runtime *runtime = gosnd->substream->runtime;
83 int frames = bytes_to_frames(runtime, length);
85 spin_lock(&gosnd->lock);
86 gosnd->hw_ptr += frames;
87 if (gosnd->hw_ptr >= runtime->buffer_size)
88 gosnd->hw_ptr -= runtime->buffer_size;
89 gosnd->avail += frames;
90 spin_unlock(&gosnd->lock);
91 if (gosnd->w_idx + length > runtime->dma_bytes) {
92 int cpy = runtime->dma_bytes - gosnd->w_idx;
94 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
99 memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
100 gosnd->w_idx += length;
101 spin_lock(&gosnd->lock);
102 if (gosnd->avail < runtime->period_size) {
103 spin_unlock(&gosnd->lock);
106 gosnd->avail -= runtime->period_size;
107 spin_unlock(&gosnd->lock);
108 if (gosnd->capturing)
109 snd_pcm_period_elapsed(gosnd->substream);
112 static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
113 struct snd_pcm_hw_params *hw_params)
115 struct go7007 *go = snd_pcm_substream_chip(substream);
118 bytes = params_buffer_bytes(hw_params);
119 if (substream->runtime->dma_bytes > 0)
120 vfree(substream->runtime->dma_area);
121 substream->runtime->dma_bytes = 0;
122 substream->runtime->dma_area = vmalloc(bytes);
123 if (substream->runtime->dma_area == NULL)
125 substream->runtime->dma_bytes = bytes;
126 go->audio_deliver = parse_audio_stream_data;
130 static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
132 struct go7007 *go = snd_pcm_substream_chip(substream);
134 go->audio_deliver = NULL;
135 if (substream->runtime->dma_bytes > 0)
136 vfree(substream->runtime->dma_area);
137 substream->runtime->dma_bytes = 0;
141 static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
143 struct go7007 *go = snd_pcm_substream_chip(substream);
144 struct go7007_snd *gosnd = go->snd_context;
148 spin_lock_irqsave(&gosnd->lock, flags);
149 if (gosnd->substream == NULL) {
150 gosnd->substream = substream;
151 substream->runtime->hw = go7007_snd_capture_hw;
155 spin_unlock_irqrestore(&gosnd->lock, flags);
159 static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
161 struct go7007 *go = snd_pcm_substream_chip(substream);
162 struct go7007_snd *gosnd = go->snd_context;
164 gosnd->substream = NULL;
168 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
173 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
175 struct go7007 *go = snd_pcm_substream_chip(substream);
176 struct go7007_snd *gosnd = go->snd_context;
179 case SNDRV_PCM_TRIGGER_START:
180 /* Just set a flag to indicate we should signal ALSA when
182 gosnd->capturing = 1;
184 case SNDRV_PCM_TRIGGER_STOP:
185 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
186 gosnd->capturing = 0;
193 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
195 struct go7007 *go = snd_pcm_substream_chip(substream);
196 struct go7007_snd *gosnd = go->snd_context;
198 return gosnd->hw_ptr;
201 static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream,
202 unsigned long offset)
204 return vmalloc_to_page(substream->runtime->dma_area + offset);
207 static struct snd_pcm_ops go7007_snd_capture_ops = {
208 .open = go7007_snd_capture_open,
209 .close = go7007_snd_capture_close,
210 .ioctl = snd_pcm_lib_ioctl,
211 .hw_params = go7007_snd_hw_params,
212 .hw_free = go7007_snd_hw_free,
213 .prepare = go7007_snd_pcm_prepare,
214 .trigger = go7007_snd_pcm_trigger,
215 .pointer = go7007_snd_pcm_pointer,
216 .page = go7007_snd_pcm_page,
219 static int go7007_snd_free(struct snd_device *device)
221 struct go7007 *go = device->device_data;
223 kfree(go->snd_context);
224 go->snd_context = NULL;
225 if (--go->ref_count == 0)
230 static struct snd_device_ops go7007_snd_device_ops = {
231 .dev_free = go7007_snd_free,
234 int go7007_snd_init(struct go7007 *go)
237 struct go7007_snd *gosnd;
240 if (dev >= SNDRV_CARDS)
246 gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
249 spin_lock_init(&gosnd->lock);
250 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
251 gosnd->capturing = 0;
252 gosnd->card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
253 if (gosnd->card == NULL) {
257 ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
258 &go7007_snd_device_ops);
263 snd_card_set_dev(gosnd->card, go->dev);
264 ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
266 snd_card_free(gosnd->card);
270 strncpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
271 strncpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver));
272 strncpy(gosnd->card->longname, gosnd->card->shortname,
273 sizeof(gosnd->card->longname));
275 gosnd->pcm->private_data = go;
276 snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
277 &go7007_snd_capture_ops);
279 ret = snd_card_register(gosnd->card);
281 snd_card_free(gosnd->card);
286 gosnd->substream = NULL;
287 go->snd_context = gosnd;
293 EXPORT_SYMBOL(go7007_snd_init);
295 int go7007_snd_remove(struct go7007 *go)
297 struct go7007_snd *gosnd = go->snd_context;
299 snd_card_disconnect(gosnd->card);
300 snd_card_free_when_closed(gosnd->card);
303 EXPORT_SYMBOL(go7007_snd_remove);
305 MODULE_LICENSE("GPL v2");