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271 lines
6.7 KiB
271 lines
6.7 KiB
// 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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