Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6] / drivers / staging / go7007 / snd-go7007.c
1 /*
2  * Copyright (C) 2005-2006 Micronas USA Inc.
3  *
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.
7  *
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.
12  *
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.
16  */
17
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>
28 #include <linux/mm.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>
36
37 #include "go7007-priv.h"
38
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;
42
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");
49
50 struct go7007_snd {
51         struct snd_card *card;
52         struct snd_pcm *pcm;
53         struct snd_pcm_substream *substream;
54         spinlock_t lock;
55         int w_idx;
56         int hw_ptr;
57         int avail;
58         int capturing;
59 };
60
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,
68         .rate_min               = 48000,
69         .rate_max               = 48000,
70         .channels_min           = 2,
71         .channels_max           = 2,
72         .buffer_bytes_max       = (128*1024),
73         .period_bytes_min       = 4096,
74         .period_bytes_max       = (128*1024),
75         .periods_min            = 1,
76         .periods_max            = 32,
77 };
78
79 static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
80 {
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);
84
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;
93
94                 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
95                 length -= cpy;
96                 buf += cpy;
97                 gosnd->w_idx = 0;
98         }
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);
104                 return;
105         }
106         gosnd->avail -= runtime->period_size;
107         spin_unlock(&gosnd->lock);
108         if (gosnd->capturing)
109                 snd_pcm_period_elapsed(gosnd->substream);
110 }
111
112 static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
113                                 struct snd_pcm_hw_params *hw_params)
114 {
115         struct go7007 *go = snd_pcm_substream_chip(substream);
116         unsigned int bytes;
117
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)
124                 return -ENOMEM;
125         substream->runtime->dma_bytes = bytes;
126         go->audio_deliver = parse_audio_stream_data;
127         return 0;
128 }
129
130 static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
131 {
132         struct go7007 *go = snd_pcm_substream_chip(substream);
133
134         go->audio_deliver = NULL;
135         if (substream->runtime->dma_bytes > 0)
136                 vfree(substream->runtime->dma_area);
137         substream->runtime->dma_bytes = 0;
138         return 0;
139 }
140
141 static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
142 {
143         struct go7007 *go = snd_pcm_substream_chip(substream);
144         struct go7007_snd *gosnd = go->snd_context;
145         unsigned long flags;
146         int r;
147
148         spin_lock_irqsave(&gosnd->lock, flags);
149         if (gosnd->substream == NULL) {
150                 gosnd->substream = substream;
151                 substream->runtime->hw = go7007_snd_capture_hw;
152                 r = 0;
153         } else
154                 r = -EBUSY;
155         spin_unlock_irqrestore(&gosnd->lock, flags);
156         return r;
157 }
158
159 static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
160 {
161         struct go7007 *go = snd_pcm_substream_chip(substream);
162         struct go7007_snd *gosnd = go->snd_context;
163
164         gosnd->substream = NULL;
165         return 0;
166 }
167
168 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
169 {
170         return 0;
171 }
172
173 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
174 {
175         struct go7007 *go = snd_pcm_substream_chip(substream);
176         struct go7007_snd *gosnd = go->snd_context;
177
178         switch (cmd) {
179         case SNDRV_PCM_TRIGGER_START:
180                 /* Just set a flag to indicate we should signal ALSA when
181                  * sound comes in */
182                 gosnd->capturing = 1;
183                 return 0;
184         case SNDRV_PCM_TRIGGER_STOP:
185                 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
186                 gosnd->capturing = 0;
187                 return 0;
188         default:
189                 return -EINVAL;
190         }
191 }
192
193 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
194 {
195         struct go7007 *go = snd_pcm_substream_chip(substream);
196         struct go7007_snd *gosnd = go->snd_context;
197
198         return gosnd->hw_ptr;
199 }
200
201 static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream,
202                                         unsigned long offset)
203 {
204         return vmalloc_to_page(substream->runtime->dma_area + offset);
205 }
206
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,
217 };
218
219 static int go7007_snd_free(struct snd_device *device)
220 {
221         struct go7007 *go = device->device_data;
222
223         kfree(go->snd_context);
224         go->snd_context = NULL;
225         if (--go->ref_count == 0)
226                 kfree(go);
227         return 0;
228 }
229
230 static struct snd_device_ops go7007_snd_device_ops = {
231         .dev_free       = go7007_snd_free,
232 };
233
234 int go7007_snd_init(struct go7007 *go)
235 {
236         static int dev;
237         struct go7007_snd *gosnd;
238         int ret = 0;
239
240         if (dev >= SNDRV_CARDS)
241                 return -ENODEV;
242         if (!enable[dev]) {
243                 dev++;
244                 return -ENOENT;
245         }
246         gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
247         if (gosnd == NULL)
248                 return -ENOMEM;
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) {
254                 kfree(gosnd);
255                 return -ENOMEM;
256         }
257         ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
258                         &go7007_snd_device_ops);
259         if (ret < 0) {
260                 kfree(gosnd);
261                 return ret;
262         }
263         snd_card_set_dev(gosnd->card, go->dev);
264         ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
265         if (ret < 0) {
266                 snd_card_free(gosnd->card);
267                 kfree(gosnd);
268                 return ret;
269         }
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));
274
275         gosnd->pcm->private_data = go;
276         snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
277                         &go7007_snd_capture_ops);
278
279         ret = snd_card_register(gosnd->card);
280         if (ret < 0) {
281                 snd_card_free(gosnd->card);
282                 kfree(gosnd);
283                 return ret;
284         }
285
286         gosnd->substream = NULL;
287         go->snd_context = gosnd;
288         ++dev;
289         ++go->ref_count;
290
291         return 0;
292 }
293 EXPORT_SYMBOL(go7007_snd_init);
294
295 int go7007_snd_remove(struct go7007 *go)
296 {
297         struct go7007_snd *gosnd = go->snd_context;
298
299         snd_card_disconnect(gosnd->card);
300         snd_card_free_when_closed(gosnd->card);
301         return 0;
302 }
303 EXPORT_SYMBOL(go7007_snd_remove);
304
305 MODULE_LICENSE("GPL v2");