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/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 		/* Just set a flag to indicate we should signal ALSA when
168 		 * sound comes in */
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");
292