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 
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 
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 
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 
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 
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 
142 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
143 {
144 	return 0;
145 }
146 
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 
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 
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 
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 
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