snd-go7007.c

  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
 24static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
 25static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
 26static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
 27
 28module_param_array(index, int, NULL, 0444);
 29module_param_array(id, charp, NULL, 0444);
 30module_param_array(enable, bool, NULL, 0444);
 31MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");
 32MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");
 33MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");
 34
 35struct 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
 46static 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
 64static 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
 98static 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
107static 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
115static 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
133static 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
142static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
143{
144	return 0;
145}
146
147static 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
167static 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
175static 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
185static 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
194static const struct snd_device_ops go7007_snd_device_ops = {
195	.dev_free	= go7007_snd_free,
196};
197
198int 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
252free_card:
253	snd_card_free(gosnd->card);
254free_snd:
255	kfree(gosnd);
256	return ret;
257}
258EXPORT_SYMBOL(go7007_snd_init);
259
260int 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}
269EXPORT_SYMBOL(go7007_snd_remove);
270
271MODULE_LICENSE("GPL v2");