This source file includes following definitions.
- parse_audio_stream_data
- go7007_snd_hw_params
- go7007_snd_hw_free
- go7007_snd_capture_open
- go7007_snd_capture_close
- go7007_snd_pcm_prepare
- go7007_snd_pcm_trigger
- go7007_snd_pcm_pointer
- go7007_snd_pcm_page
- go7007_snd_free
- go7007_snd_init
- go7007_snd_remove
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6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/moduleparam.h>
9 #include <linux/spinlock.h>
10 #include <linux/delay.h>
11 #include <linux/sched.h>
12 #include <linux/vmalloc.h>
13 #include <linux/time.h>
14 #include <linux/mm.h>
15 #include <linux/i2c.h>
16 #include <linux/mutex.h>
17 #include <linux/uaccess.h>
18 #include <linux/slab.h>
19 #include <sound/core.h>
20 #include <sound/pcm.h>
21 #include <sound/initval.h>
22
23 #include "go7007-priv.h"
24
25 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
26 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
27 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
28
29 module_param_array(index, int, NULL, 0444);
30 module_param_array(id, charp, NULL, 0444);
31 module_param_array(enable, bool, NULL, 0444);
32 MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");
33 MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");
34 MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");
35
36 struct go7007_snd {
37 struct snd_card *card;
38 struct snd_pcm *pcm;
39 struct snd_pcm_substream *substream;
40 spinlock_t lock;
41 int w_idx;
42 int hw_ptr;
43 int avail;
44 int capturing;
45 };
46
47 static const struct snd_pcm_hardware go7007_snd_capture_hw = {
48 .info = (SNDRV_PCM_INFO_MMAP |
49 SNDRV_PCM_INFO_INTERLEAVED |
50 SNDRV_PCM_INFO_BLOCK_TRANSFER |
51 SNDRV_PCM_INFO_MMAP_VALID),
52 .formats = SNDRV_PCM_FMTBIT_S16_LE,
53 .rates = SNDRV_PCM_RATE_48000,
54 .rate_min = 48000,
55 .rate_max = 48000,
56 .channels_min = 2,
57 .channels_max = 2,
58 .buffer_bytes_max = (128*1024),
59 .period_bytes_min = 4096,
60 .period_bytes_max = (128*1024),
61 .periods_min = 1,
62 .periods_max = 32,
63 };
64
65 static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
66 {
67 struct go7007_snd *gosnd = go->snd_context;
68 struct snd_pcm_runtime *runtime = gosnd->substream->runtime;
69 int frames = bytes_to_frames(runtime, length);
70 unsigned long flags;
71
72 spin_lock_irqsave(&gosnd->lock, flags);
73 gosnd->hw_ptr += frames;
74 if (gosnd->hw_ptr >= runtime->buffer_size)
75 gosnd->hw_ptr -= runtime->buffer_size;
76 gosnd->avail += frames;
77 spin_unlock_irqrestore(&gosnd->lock, flags);
78 if (gosnd->w_idx + length > runtime->dma_bytes) {
79 int cpy = runtime->dma_bytes - gosnd->w_idx;
80
81 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
82 length -= cpy;
83 buf += cpy;
84 gosnd->w_idx = 0;
85 }
86 memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
87 gosnd->w_idx += length;
88 spin_lock_irqsave(&gosnd->lock, flags);
89 if (gosnd->avail < runtime->period_size) {
90 spin_unlock_irqrestore(&gosnd->lock, flags);
91 return;
92 }
93 gosnd->avail -= runtime->period_size;
94 spin_unlock_irqrestore(&gosnd->lock, flags);
95 if (gosnd->capturing)
96 snd_pcm_period_elapsed(gosnd->substream);
97 }
98
99 static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
100 struct snd_pcm_hw_params *hw_params)
101 {
102 struct go7007 *go = snd_pcm_substream_chip(substream);
103 unsigned int bytes;
104
105 bytes = params_buffer_bytes(hw_params);
106 if (substream->runtime->dma_bytes > 0)
107 vfree(substream->runtime->dma_area);
108 substream->runtime->dma_bytes = 0;
109 substream->runtime->dma_area = vmalloc(bytes);
110 if (substream->runtime->dma_area == NULL)
111 return -ENOMEM;
112 substream->runtime->dma_bytes = bytes;
113 go->audio_deliver = parse_audio_stream_data;
114 return 0;
115 }
116
117 static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
118 {
119 struct go7007 *go = snd_pcm_substream_chip(substream);
120
121 go->audio_deliver = NULL;
122 if (substream->runtime->dma_bytes > 0)
123 vfree(substream->runtime->dma_area);
124 substream->runtime->dma_bytes = 0;
125 return 0;
126 }
127
128 static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
129 {
130 struct go7007 *go = snd_pcm_substream_chip(substream);
131 struct go7007_snd *gosnd = go->snd_context;
132 unsigned long flags;
133 int r;
134
135 spin_lock_irqsave(&gosnd->lock, flags);
136 if (gosnd->substream == NULL) {
137 gosnd->substream = substream;
138 substream->runtime->hw = go7007_snd_capture_hw;
139 r = 0;
140 } else
141 r = -EBUSY;
142 spin_unlock_irqrestore(&gosnd->lock, flags);
143 return r;
144 }
145
146 static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
147 {
148 struct go7007 *go = snd_pcm_substream_chip(substream);
149 struct go7007_snd *gosnd = go->snd_context;
150
151 gosnd->substream = NULL;
152 return 0;
153 }
154
155 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
156 {
157 return 0;
158 }
159
160 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
161 {
162 struct go7007 *go = snd_pcm_substream_chip(substream);
163 struct go7007_snd *gosnd = go->snd_context;
164
165 switch (cmd) {
166 case SNDRV_PCM_TRIGGER_START:
167
168
169 gosnd->capturing = 1;
170 return 0;
171 case SNDRV_PCM_TRIGGER_STOP:
172 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
173 gosnd->capturing = 0;
174 return 0;
175 default:
176 return -EINVAL;
177 }
178 }
179
180 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
181 {
182 struct go7007 *go = snd_pcm_substream_chip(substream);
183 struct go7007_snd *gosnd = go->snd_context;
184
185 return gosnd->hw_ptr;
186 }
187
188 static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream,
189 unsigned long offset)
190 {
191 return vmalloc_to_page(substream->runtime->dma_area + offset);
192 }
193
194 static const struct snd_pcm_ops go7007_snd_capture_ops = {
195 .open = go7007_snd_capture_open,
196 .close = go7007_snd_capture_close,
197 .ioctl = snd_pcm_lib_ioctl,
198 .hw_params = go7007_snd_hw_params,
199 .hw_free = go7007_snd_hw_free,
200 .prepare = go7007_snd_pcm_prepare,
201 .trigger = go7007_snd_pcm_trigger,
202 .pointer = go7007_snd_pcm_pointer,
203 .page = go7007_snd_pcm_page,
204 };
205
206 static int go7007_snd_free(struct snd_device *device)
207 {
208 struct go7007 *go = device->device_data;
209
210 kfree(go->snd_context);
211 go->snd_context = NULL;
212 return 0;
213 }
214
215 static struct snd_device_ops go7007_snd_device_ops = {
216 .dev_free = go7007_snd_free,
217 };
218
219 int go7007_snd_init(struct go7007 *go)
220 {
221 static int dev;
222 struct go7007_snd *gosnd;
223 int ret;
224
225 if (dev >= SNDRV_CARDS)
226 return -ENODEV;
227 if (!enable[dev]) {
228 dev++;
229 return -ENOENT;
230 }
231 gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
232 if (gosnd == NULL)
233 return -ENOMEM;
234 spin_lock_init(&gosnd->lock);
235 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
236 gosnd->capturing = 0;
237 ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0,
238 &gosnd->card);
239 if (ret < 0) {
240 kfree(gosnd);
241 return ret;
242 }
243 ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
244 &go7007_snd_device_ops);
245 if (ret < 0) {
246 kfree(gosnd);
247 return ret;
248 }
249 ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
250 if (ret < 0) {
251 snd_card_free(gosnd->card);
252 kfree(gosnd);
253 return ret;
254 }
255 strscpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
256 strscpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->shortname));
257 strscpy(gosnd->card->longname, gosnd->card->shortname,
258 sizeof(gosnd->card->longname));
259
260 gosnd->pcm->private_data = go;
261 snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
262 &go7007_snd_capture_ops);
263
264 ret = snd_card_register(gosnd->card);
265 if (ret < 0) {
266 snd_card_free(gosnd->card);
267 kfree(gosnd);
268 return ret;
269 }
270
271 gosnd->substream = NULL;
272 go->snd_context = gosnd;
273 v4l2_device_get(&go->v4l2_dev);
274 ++dev;
275
276 return 0;
277 }
278 EXPORT_SYMBOL(go7007_snd_init);
279
280 int go7007_snd_remove(struct go7007 *go)
281 {
282 struct go7007_snd *gosnd = go->snd_context;
283
284 snd_card_disconnect(gosnd->card);
285 snd_card_free_when_closed(gosnd->card);
286 v4l2_device_put(&go->v4l2_dev);
287 return 0;
288 }
289 EXPORT_SYMBOL(go7007_snd_remove);
290
291 MODULE_LICENSE("GPL v2");