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/* |
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* Copyright (C) 2005-2006 Micronas USA Inc. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License (Version 2) as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software Foundation, |
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* Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. |
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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/version.h> |
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#include <linux/moduleparam.h> |
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#include <linux/init.h> |
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#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,17) |
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#include <linux/config.h> |
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#endif |
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#include <linux/delay.h> |
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#include <linux/sched.h> |
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#include <linux/vmalloc.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 <asm/uaccess.h> |
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#include <asm/semaphore.h> |
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#include <asm/system.h> |
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#include <sound/driver.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 int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; |
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,10) |
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static int index_num, id_num, enable_num; |
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module_param_array(index, int, index_num, 0444); |
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module_param_array(id, charp, id_num, 0444); |
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module_param_array(enable, bool, enable_num, 0444); |
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#else |
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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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#endif |
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MODULE_PARM_DESC(index, "Index value for the go7007 audio driver"); |
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MODULE_PARM_DESC(index, "ID string for the go7007 audio driver"); |
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MODULE_PARM_DESC(index, "Enable for the go7007 audio driver"); |
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struct go7007_snd { |
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snd_card_t *card; |
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snd_pcm_t *pcm; |
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snd_pcm_substream_t *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 snd_pcm_hardware_t 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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snd_pcm_runtime_t *runtime = gosnd->substream->runtime; |
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int frames = bytes_to_frames(runtime, length); |
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spin_lock(&gosnd->lock); |
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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(&gosnd->lock); |
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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(&gosnd->lock); |
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if (gosnd->avail < runtime->period_size) { |
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spin_unlock(&gosnd->lock); |
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return; |
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} |
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gosnd->avail -= runtime->period_size; |
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spin_unlock(&gosnd->lock); |
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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(snd_pcm_substream_t *substream, |
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snd_pcm_hw_params_t *hw_params) |
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{ |
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struct go7007 *go = snd_pcm_substream_chip(substream); |
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unsigned int bytes; |
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bytes = params_buffer_bytes(hw_params); |
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if (substream->runtime->dma_bytes > 0) |
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vfree(substream->runtime->dma_area); |
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substream->runtime->dma_bytes = 0; |
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substream->runtime->dma_area = vmalloc(bytes); |
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if (substream->runtime->dma_area == NULL) |
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return -ENOMEM; |
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substream->runtime->dma_bytes = bytes; |
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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(snd_pcm_substream_t *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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if (substream->runtime->dma_bytes > 0) |
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vfree(substream->runtime->dma_area); |
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substream->runtime->dma_bytes = 0; |
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return 0; |
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} |
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static int go7007_snd_capture_open(snd_pcm_substream_t *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(snd_pcm_substream_t *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(snd_pcm_substream_t *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(snd_pcm_substream_t *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(snd_pcm_substream_t *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 struct page *go7007_snd_pcm_page(snd_pcm_substream_t *substream, |
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unsigned long offset) |
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{ |
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return vmalloc_to_page(substream->runtime->dma_area + offset); |
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} |
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static snd_pcm_ops_t 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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.ioctl = snd_pcm_lib_ioctl, |
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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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.page = go7007_snd_pcm_page, |
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}; |
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static int go7007_snd_free(snd_device_t *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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if (--go->ref_count == 0) |
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kfree(go); |
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return 0; |
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} |
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static snd_device_ops_t 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 = 0; |
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struct go7007_snd *gosnd; |
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int ret = 0; |
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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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gosnd->lock = SPIN_LOCK_UNLOCKED; |
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gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0; |
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gosnd->capturing = 0; |
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gosnd->card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0); |
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if (gosnd->card == NULL) { |
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kfree(gosnd); |
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return -ENOMEM; |
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} |
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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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kfree(gosnd); |
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return ret; |
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} |
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snd_card_set_dev(gosnd->card, go->dev); |
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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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snd_card_free(gosnd->card); |
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kfree(gosnd); |
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return ret; |
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} |
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strncpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver)); |
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strncpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver)); |
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strncpy(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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ret = snd_card_register(gosnd->card); |
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if (ret < 0) { |
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snd_card_free(gosnd->card); |
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kfree(gosnd); |
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return ret; |
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} |
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gosnd->substream = NULL; |
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go->snd_context = gosnd; |
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++dev; |
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++go->ref_count; |
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return 0; |
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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_in_thread(gosnd->card); |
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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"); |
