1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2005-2006 Micronas USA Inc.
4 */
5
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/time.h>
13 #include <linux/mm.h>
14 #include <linux/i2c.h>
15 #include <linux/mutex.h>
16 #include <linux/uaccess.h>
17 #include <linux/slab.h>
18 #include <sound/core.h>
19 #include <sound/pcm.h>
20 #include <sound/initval.h>
21
22 #include "go7007-priv.h"
23
24 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
25 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
26 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
27
28 module_param_array(index, int, NULL, 0444);
29 module_param_array(id, charp, NULL, 0444);
30 module_param_array(enable, bool, NULL, 0444);
31 MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");
32 MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");
33 MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");
34
35 struct go7007_snd {
36 struct snd_card *card;
37 struct snd_pcm *pcm;
38 struct snd_pcm_substream *substream;
39 spinlock_t lock;
40 int w_idx;
41 int hw_ptr;
42 int avail;
43 int capturing;
44 };
45
46 static const struct snd_pcm_hardware go7007_snd_capture_hw = {
47 .info = (SNDRV_PCM_INFO_MMAP |
48 SNDRV_PCM_INFO_INTERLEAVED |
49 SNDRV_PCM_INFO_BLOCK_TRANSFER |
50 SNDRV_PCM_INFO_MMAP_VALID),
51 .formats = SNDRV_PCM_FMTBIT_S16_LE,
52 .rates = SNDRV_PCM_RATE_48000,
53 .rate_min = 48000,
54 .rate_max = 48000,
55 .channels_min = 2,
56 .channels_max = 2,
57 .buffer_bytes_max = (128*1024),
58 .period_bytes_min = 4096,
59 .period_bytes_max = (128*1024),
60 .periods_min = 1,
61 .periods_max = 32,
62 };
63
parse_audio_stream_data(struct go7007 * go,u8 * buf,int length)64 static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
65 {
66 struct go7007_snd *gosnd = go->snd_context;
67 struct snd_pcm_runtime *runtime = gosnd->substream->runtime;
68 int frames = bytes_to_frames(runtime, length);
69 unsigned long flags;
70
71 spin_lock_irqsave(&gosnd->lock, flags);
72 gosnd->hw_ptr += frames;
73 if (gosnd->hw_ptr >= runtime->buffer_size)
74 gosnd->hw_ptr -= runtime->buffer_size;
75 gosnd->avail += frames;
76 spin_unlock_irqrestore(&gosnd->lock, flags);
77 if (gosnd->w_idx + length > runtime->dma_bytes) {
78 int cpy = runtime->dma_bytes - gosnd->w_idx;
79
80 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
81 length -= cpy;
82 buf += cpy;
83 gosnd->w_idx = 0;
84 }
85 memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
86 gosnd->w_idx += length;
87 spin_lock_irqsave(&gosnd->lock, flags);
88 if (gosnd->avail < runtime->period_size) {
89 spin_unlock_irqrestore(&gosnd->lock, flags);
90 return;
91 }
92 gosnd->avail -= runtime->period_size;
93 spin_unlock_irqrestore(&gosnd->lock, flags);
94 if (gosnd->capturing)
95 snd_pcm_period_elapsed(gosnd->substream);
96 }
97
go7007_snd_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)98 static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
99 struct snd_pcm_hw_params *hw_params)
100 {
101 struct go7007 *go = snd_pcm_substream_chip(substream);
102
103 go->audio_deliver = parse_audio_stream_data;
104 return 0;
105 }
106
go7007_snd_hw_free(struct snd_pcm_substream * substream)107 static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
108 {
109 struct go7007 *go = snd_pcm_substream_chip(substream);
110
111 go->audio_deliver = NULL;
112 return 0;
113 }
114
go7007_snd_capture_open(struct snd_pcm_substream * substream)115 static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
116 {
117 struct go7007 *go = snd_pcm_substream_chip(substream);
118 struct go7007_snd *gosnd = go->snd_context;
119 unsigned long flags;
120 int r;
121
122 spin_lock_irqsave(&gosnd->lock, flags);
123 if (gosnd->substream == NULL) {
124 gosnd->substream = substream;
125 substream->runtime->hw = go7007_snd_capture_hw;
126 r = 0;
127 } else
128 r = -EBUSY;
129 spin_unlock_irqrestore(&gosnd->lock, flags);
130 return r;
131 }
132
go7007_snd_capture_close(struct snd_pcm_substream * substream)133 static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
134 {
135 struct go7007 *go = snd_pcm_substream_chip(substream);
136 struct go7007_snd *gosnd = go->snd_context;
137
138 gosnd->substream = NULL;
139 return 0;
140 }
141
go7007_snd_pcm_prepare(struct snd_pcm_substream * substream)142 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
143 {
144 return 0;
145 }
146
go7007_snd_pcm_trigger(struct snd_pcm_substream * substream,int cmd)147 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
148 {
149 struct go7007 *go = snd_pcm_substream_chip(substream);
150 struct go7007_snd *gosnd = go->snd_context;
151
152 switch (cmd) {
153 case SNDRV_PCM_TRIGGER_START:
154 /* Just set a flag to indicate we should signal ALSA when
155 * sound comes in */
156 gosnd->capturing = 1;
157 return 0;
158 case SNDRV_PCM_TRIGGER_STOP:
159 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
160 gosnd->capturing = 0;
161 return 0;
162 default:
163 return -EINVAL;
164 }
165 }
166
go7007_snd_pcm_pointer(struct snd_pcm_substream * substream)167 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
168 {
169 struct go7007 *go = snd_pcm_substream_chip(substream);
170 struct go7007_snd *gosnd = go->snd_context;
171
172 return gosnd->hw_ptr;
173 }
174
175 static const struct snd_pcm_ops go7007_snd_capture_ops = {
176 .open = go7007_snd_capture_open,
177 .close = go7007_snd_capture_close,
178 .hw_params = go7007_snd_hw_params,
179 .hw_free = go7007_snd_hw_free,
180 .prepare = go7007_snd_pcm_prepare,
181 .trigger = go7007_snd_pcm_trigger,
182 .pointer = go7007_snd_pcm_pointer,
183 };
184
go7007_snd_free(struct snd_device * device)185 static int go7007_snd_free(struct snd_device *device)
186 {
187 struct go7007 *go = device->device_data;
188
189 kfree(go->snd_context);
190 go->snd_context = NULL;
191 return 0;
192 }
193
194 static const struct snd_device_ops go7007_snd_device_ops = {
195 .dev_free = go7007_snd_free,
196 };
197
go7007_snd_init(struct go7007 * go)198 int go7007_snd_init(struct go7007 *go)
199 {
200 static int dev;
201 struct go7007_snd *gosnd;
202 int ret;
203
204 if (dev >= SNDRV_CARDS)
205 return -ENODEV;
206 if (!enable[dev]) {
207 dev++;
208 return -ENOENT;
209 }
210 gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
211 if (gosnd == NULL)
212 return -ENOMEM;
213 spin_lock_init(&gosnd->lock);
214 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
215 gosnd->capturing = 0;
216 ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0,
217 &gosnd->card);
218 if (ret < 0)
219 goto free_snd;
220
221 ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
222 &go7007_snd_device_ops);
223 if (ret < 0)
224 goto free_card;
225
226 ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
227 if (ret < 0)
228 goto free_card;
229
230 strscpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
231 strscpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->shortname));
232 strscpy(gosnd->card->longname, gosnd->card->shortname,
233 sizeof(gosnd->card->longname));
234
235 gosnd->pcm->private_data = go;
236 snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
237 &go7007_snd_capture_ops);
238 snd_pcm_set_managed_buffer_all(gosnd->pcm, SNDRV_DMA_TYPE_VMALLOC,
239 NULL, 0, 0);
240
241 ret = snd_card_register(gosnd->card);
242 if (ret < 0)
243 goto free_card;
244
245 gosnd->substream = NULL;
246 go->snd_context = gosnd;
247 v4l2_device_get(&go->v4l2_dev);
248 ++dev;
249
250 return 0;
251
252 free_card:
253 snd_card_free(gosnd->card);
254 free_snd:
255 kfree(gosnd);
256 return ret;
257 }
258 EXPORT_SYMBOL(go7007_snd_init);
259
go7007_snd_remove(struct go7007 * go)260 int go7007_snd_remove(struct go7007 *go)
261 {
262 struct go7007_snd *gosnd = go->snd_context;
263
264 snd_card_disconnect(gosnd->card);
265 snd_card_free_when_closed(gosnd->card);
266 v4l2_device_put(&go->v4l2_dev);
267 return 0;
268 }
269 EXPORT_SYMBOL(go7007_snd_remove);
270
271 MODULE_LICENSE("GPL v2");
272