| /* |
| * Copyright (C) 2005-2006 Micronas USA Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License (Version 2) as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software Foundation, |
| * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/version.h> |
| #include <linux/moduleparam.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <linux/delay.h> |
| #include <linux/sched.h> |
| #include <linux/vmalloc.h> |
| #include <linux/time.h> |
| #include <linux/mm.h> |
| #include <linux/i2c.h> |
| #include <linux/semaphore.h> |
| #include <linux/uaccess.h> |
| #include <asm/system.h> |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/initval.h> |
| |
| #include "go7007-priv.h" |
| |
| static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; |
| static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; |
| static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; |
| |
| module_param_array(index, int, NULL, 0444); |
| module_param_array(id, charp, NULL, 0444); |
| module_param_array(enable, bool, NULL, 0444); |
| MODULE_PARM_DESC(index, "Index value for the go7007 audio driver"); |
| MODULE_PARM_DESC(id, "ID string for the go7007 audio driver"); |
| MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver"); |
| |
| struct go7007_snd { |
| struct snd_card *card; |
| struct snd_pcm *pcm; |
| struct snd_pcm_substream *substream; |
| spinlock_t lock; |
| int w_idx; |
| int hw_ptr; |
| int avail; |
| int capturing; |
| }; |
| |
| static struct snd_pcm_hardware go7007_snd_capture_hw = { |
| .info = (SNDRV_PCM_INFO_MMAP | |
| SNDRV_PCM_INFO_INTERLEAVED | |
| SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| SNDRV_PCM_INFO_MMAP_VALID), |
| .formats = SNDRV_PCM_FMTBIT_S16_LE, |
| .rates = SNDRV_PCM_RATE_48000, |
| .rate_min = 48000, |
| .rate_max = 48000, |
| .channels_min = 2, |
| .channels_max = 2, |
| .buffer_bytes_max = (128*1024), |
| .period_bytes_min = 4096, |
| .period_bytes_max = (128*1024), |
| .periods_min = 1, |
| .periods_max = 32, |
| }; |
| |
| static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length) |
| { |
| struct go7007_snd *gosnd = go->snd_context; |
| struct snd_pcm_runtime *runtime = gosnd->substream->runtime; |
| int frames = bytes_to_frames(runtime, length); |
| |
| spin_lock(&gosnd->lock); |
| gosnd->hw_ptr += frames; |
| if (gosnd->hw_ptr >= runtime->buffer_size) |
| gosnd->hw_ptr -= runtime->buffer_size; |
| gosnd->avail += frames; |
| spin_unlock(&gosnd->lock); |
| if (gosnd->w_idx + length > runtime->dma_bytes) { |
| int cpy = runtime->dma_bytes - gosnd->w_idx; |
| |
| memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy); |
| length -= cpy; |
| buf += cpy; |
| gosnd->w_idx = 0; |
| } |
| memcpy(runtime->dma_area + gosnd->w_idx, buf, length); |
| gosnd->w_idx += length; |
| spin_lock(&gosnd->lock); |
| if (gosnd->avail < runtime->period_size) { |
| spin_unlock(&gosnd->lock); |
| return; |
| } |
| gosnd->avail -= runtime->period_size; |
| spin_unlock(&gosnd->lock); |
| if (gosnd->capturing) |
| snd_pcm_period_elapsed(gosnd->substream); |
| } |
| |
| static int go7007_snd_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *hw_params) |
| { |
| struct go7007 *go = snd_pcm_substream_chip(substream); |
| unsigned int bytes; |
| |
| bytes = params_buffer_bytes(hw_params); |
| if (substream->runtime->dma_bytes > 0) |
| vfree(substream->runtime->dma_area); |
| substream->runtime->dma_bytes = 0; |
| substream->runtime->dma_area = vmalloc(bytes); |
| if (substream->runtime->dma_area == NULL) |
| return -ENOMEM; |
| substream->runtime->dma_bytes = bytes; |
| go->audio_deliver = parse_audio_stream_data; |
| return 0; |
| } |
| |
| static int go7007_snd_hw_free(struct snd_pcm_substream *substream) |
| { |
| struct go7007 *go = snd_pcm_substream_chip(substream); |
| |
| go->audio_deliver = NULL; |
| if (substream->runtime->dma_bytes > 0) |
| vfree(substream->runtime->dma_area); |
| substream->runtime->dma_bytes = 0; |
| return 0; |
| } |
| |
| static int go7007_snd_capture_open(struct snd_pcm_substream *substream) |
| { |
| struct go7007 *go = snd_pcm_substream_chip(substream); |
| struct go7007_snd *gosnd = go->snd_context; |
| unsigned long flags; |
| int r; |
| |
| spin_lock_irqsave(&gosnd->lock, flags); |
| if (gosnd->substream == NULL) { |
| gosnd->substream = substream; |
| substream->runtime->hw = go7007_snd_capture_hw; |
| r = 0; |
| } else |
| r = -EBUSY; |
| spin_unlock_irqrestore(&gosnd->lock, flags); |
| return r; |
| } |
| |
| static int go7007_snd_capture_close(struct snd_pcm_substream *substream) |
| { |
| struct go7007 *go = snd_pcm_substream_chip(substream); |
| struct go7007_snd *gosnd = go->snd_context; |
| |
| gosnd->substream = NULL; |
| return 0; |
| } |
| |
| static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream) |
| { |
| return 0; |
| } |
| |
| static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| { |
| struct go7007 *go = snd_pcm_substream_chip(substream); |
| struct go7007_snd *gosnd = go->snd_context; |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_START: |
| /* Just set a flag to indicate we should signal ALSA when |
| * sound comes in */ |
| gosnd->capturing = 1; |
| return 0; |
| case SNDRV_PCM_TRIGGER_STOP: |
| gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0; |
| gosnd->capturing = 0; |
| return 0; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream) |
| { |
| struct go7007 *go = snd_pcm_substream_chip(substream); |
| struct go7007_snd *gosnd = go->snd_context; |
| |
| return gosnd->hw_ptr; |
| } |
| |
| static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream, |
| unsigned long offset) |
| { |
| return vmalloc_to_page(substream->runtime->dma_area + offset); |
| } |
| |
| static struct snd_pcm_ops go7007_snd_capture_ops = { |
| .open = go7007_snd_capture_open, |
| .close = go7007_snd_capture_close, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = go7007_snd_hw_params, |
| .hw_free = go7007_snd_hw_free, |
| .prepare = go7007_snd_pcm_prepare, |
| .trigger = go7007_snd_pcm_trigger, |
| .pointer = go7007_snd_pcm_pointer, |
| .page = go7007_snd_pcm_page, |
| }; |
| |
| static int go7007_snd_free(struct snd_device *device) |
| { |
| struct go7007 *go = device->device_data; |
| |
| kfree(go->snd_context); |
| go->snd_context = NULL; |
| if (--go->ref_count == 0) |
| kfree(go); |
| return 0; |
| } |
| |
| static struct snd_device_ops go7007_snd_device_ops = { |
| .dev_free = go7007_snd_free, |
| }; |
| |
| int go7007_snd_init(struct go7007 *go) |
| { |
| static int dev; |
| struct go7007_snd *gosnd; |
| int ret = 0; |
| |
| if (dev >= SNDRV_CARDS) |
| return -ENODEV; |
| if (!enable[dev]) { |
| dev++; |
| return -ENOENT; |
| } |
| gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL); |
| if (gosnd == NULL) |
| return -ENOMEM; |
| spin_lock_init(&gosnd->lock); |
| gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0; |
| gosnd->capturing = 0; |
| gosnd->card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0); |
| if (gosnd->card == NULL) { |
| kfree(gosnd); |
| return -ENOMEM; |
| } |
| ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go, |
| &go7007_snd_device_ops); |
| if (ret < 0) { |
| kfree(gosnd); |
| return ret; |
| } |
| snd_card_set_dev(gosnd->card, go->dev); |
| ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm); |
| if (ret < 0) { |
| snd_card_free(gosnd->card); |
| kfree(gosnd); |
| return ret; |
| } |
| strncpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver)); |
| strncpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver)); |
| strncpy(gosnd->card->longname, gosnd->card->shortname, |
| sizeof(gosnd->card->longname)); |
| |
| gosnd->pcm->private_data = go; |
| snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE, |
| &go7007_snd_capture_ops); |
| |
| ret = snd_card_register(gosnd->card); |
| if (ret < 0) { |
| snd_card_free(gosnd->card); |
| kfree(gosnd); |
| return ret; |
| } |
| |
| gosnd->substream = NULL; |
| go->snd_context = gosnd; |
| ++dev; |
| ++go->ref_count; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(go7007_snd_init); |
| |
| int go7007_snd_remove(struct go7007 *go) |
| { |
| struct go7007_snd *gosnd = go->snd_context; |
| |
| snd_card_disconnect(gosnd->card); |
| snd_card_free_when_closed(gosnd->card); |
| return 0; |
| } |
| EXPORT_SYMBOL(go7007_snd_remove); |
| |
| MODULE_LICENSE("GPL v2"); |