// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2005-2006 Micronas USA Inc.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/time.h>
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#include <linux/mm.h>
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#include <linux/i2c.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/initval.h>
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#include "go7007-priv.h"
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
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static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
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static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
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module_param_array(index, int, NULL, 0444);
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module_param_array(id, charp, NULL, 0444);
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module_param_array(enable, bool, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");
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MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");
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MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");
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struct go7007_snd {
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struct snd_card *card;
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struct snd_pcm *pcm;
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struct snd_pcm_substream *substream;
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spinlock_t lock;
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int w_idx;
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int hw_ptr;
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int avail;
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int capturing;
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};
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static const struct snd_pcm_hardware go7007_snd_capture_hw = {
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.info = (SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP_VALID),
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.rates = SNDRV_PCM_RATE_48000,
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.rate_min = 48000,
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.rate_max = 48000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = (128*1024),
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.period_bytes_min = 4096,
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.period_bytes_max = (128*1024),
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.periods_min = 1,
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.periods_max = 32,
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};
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static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
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{
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struct go7007_snd *gosnd = go->snd_context;
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struct snd_pcm_runtime *runtime = gosnd->substream->runtime;
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int frames = bytes_to_frames(runtime, length);
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unsigned long flags;
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spin_lock_irqsave(&gosnd->lock, flags);
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gosnd->hw_ptr += frames;
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if (gosnd->hw_ptr >= runtime->buffer_size)
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gosnd->hw_ptr -= runtime->buffer_size;
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gosnd->avail += frames;
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spin_unlock_irqrestore(&gosnd->lock, flags);
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if (gosnd->w_idx + length > runtime->dma_bytes) {
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int cpy = runtime->dma_bytes - gosnd->w_idx;
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memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
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length -= cpy;
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buf += cpy;
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gosnd->w_idx = 0;
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}
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memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
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gosnd->w_idx += length;
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spin_lock_irqsave(&gosnd->lock, flags);
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if (gosnd->avail < runtime->period_size) {
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spin_unlock_irqrestore(&gosnd->lock, flags);
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return;
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}
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gosnd->avail -= runtime->period_size;
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spin_unlock_irqrestore(&gosnd->lock, flags);
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if (gosnd->capturing)
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snd_pcm_period_elapsed(gosnd->substream);
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}
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static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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struct go7007 *go = snd_pcm_substream_chip(substream);
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go->audio_deliver = parse_audio_stream_data;
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return 0;
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}
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static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
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{
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struct go7007 *go = snd_pcm_substream_chip(substream);
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go->audio_deliver = NULL;
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return 0;
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}
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static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
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{
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struct go7007 *go = snd_pcm_substream_chip(substream);
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struct go7007_snd *gosnd = go->snd_context;
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unsigned long flags;
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int r;
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spin_lock_irqsave(&gosnd->lock, flags);
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if (gosnd->substream == NULL) {
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gosnd->substream = substream;
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substream->runtime->hw = go7007_snd_capture_hw;
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r = 0;
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} else
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r = -EBUSY;
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spin_unlock_irqrestore(&gosnd->lock, flags);
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return r;
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}
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static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
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{
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struct go7007 *go = snd_pcm_substream_chip(substream);
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struct go7007_snd *gosnd = go->snd_context;
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gosnd->substream = NULL;
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return 0;
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}
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static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
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{
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return 0;
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}
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static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct go7007 *go = snd_pcm_substream_chip(substream);
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struct go7007_snd *gosnd = go->snd_context;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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/* Just set a flag to indicate we should signal ALSA when
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* sound comes in */
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gosnd->capturing = 1;
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return 0;
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case SNDRV_PCM_TRIGGER_STOP:
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gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
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gosnd->capturing = 0;
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return 0;
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default:
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return -EINVAL;
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}
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}
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static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct go7007 *go = snd_pcm_substream_chip(substream);
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struct go7007_snd *gosnd = go->snd_context;
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return gosnd->hw_ptr;
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}
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static const struct snd_pcm_ops go7007_snd_capture_ops = {
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.open = go7007_snd_capture_open,
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.close = go7007_snd_capture_close,
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.hw_params = go7007_snd_hw_params,
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.hw_free = go7007_snd_hw_free,
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.prepare = go7007_snd_pcm_prepare,
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.trigger = go7007_snd_pcm_trigger,
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.pointer = go7007_snd_pcm_pointer,
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};
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static int go7007_snd_free(struct snd_device *device)
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{
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struct go7007 *go = device->device_data;
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kfree(go->snd_context);
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go->snd_context = NULL;
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return 0;
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}
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static struct snd_device_ops go7007_snd_device_ops = {
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.dev_free = go7007_snd_free,
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};
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int go7007_snd_init(struct go7007 *go)
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{
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static int dev;
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struct go7007_snd *gosnd;
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int ret;
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if (dev >= SNDRV_CARDS)
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return -ENODEV;
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if (!enable[dev]) {
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dev++;
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return -ENOENT;
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}
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gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
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if (gosnd == NULL)
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return -ENOMEM;
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spin_lock_init(&gosnd->lock);
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gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
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gosnd->capturing = 0;
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ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0,
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&gosnd->card);
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if (ret < 0)
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goto free_snd;
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ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
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&go7007_snd_device_ops);
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if (ret < 0)
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goto free_card;
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ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
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if (ret < 0)
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goto free_card;
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strscpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
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strscpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->shortname));
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strscpy(gosnd->card->longname, gosnd->card->shortname,
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sizeof(gosnd->card->longname));
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gosnd->pcm->private_data = go;
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snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
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&go7007_snd_capture_ops);
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snd_pcm_set_managed_buffer_all(gosnd->pcm, SNDRV_DMA_TYPE_VMALLOC,
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NULL, 0, 0);
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ret = snd_card_register(gosnd->card);
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if (ret < 0)
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goto free_card;
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gosnd->substream = NULL;
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go->snd_context = gosnd;
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v4l2_device_get(&go->v4l2_dev);
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++dev;
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return 0;
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free_card:
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snd_card_free(gosnd->card);
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free_snd:
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kfree(gosnd);
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return ret;
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}
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EXPORT_SYMBOL(go7007_snd_init);
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int go7007_snd_remove(struct go7007 *go)
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{
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struct go7007_snd *gosnd = go->snd_context;
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snd_card_disconnect(gosnd->card);
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snd_card_free_when_closed(gosnd->card);
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v4l2_device_put(&go->v4l2_dev);
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return 0;
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}
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EXPORT_SYMBOL(go7007_snd_remove);
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MODULE_LICENSE("GPL v2");
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