1 /* 2 * ALSA PCM interface for ST SPEAr Processors 3 * 4 * sound/soc/spear/spear_pcm.c 5 * 6 * Copyright (C) 2012 ST Microelectronics 7 * Rajeev Kumar<rajeevkumar.linux@gmail.com> 8 * 9 * This file is licensed under the terms of the GNU General Public 10 * License version 2. This program is licensed "as is" without any 11 * warranty of any kind, whether express or implied. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/dmaengine.h> 16 #include <linux/platform_device.h> 17 #include <sound/dmaengine_pcm.h> 18 #include <sound/pcm.h> 19 #include <sound/soc.h> 20 #include <sound/spear_dma.h> 21 #include "spear_pcm.h" 22 23 static const struct snd_pcm_hardware spear_pcm_hardware = { 24 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | 25 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | 26 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME), 27 .buffer_bytes_max = 16 * 1024, /* max buffer size */ 28 .period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */ 29 .period_bytes_max = 2 * 1024, /* maximum period size */ 30 .periods_min = 1, /* min # periods */ 31 .periods_max = 8, /* max # of periods */ 32 .fifo_size = 0, /* fifo size in bytes */ 33 }; 34 35 static const struct snd_dmaengine_pcm_config spear_dmaengine_pcm_config = { 36 .pcm_hardware = &spear_pcm_hardware, 37 .prealloc_buffer_size = 16 * 1024, 38 }; 39 40 int devm_spear_pcm_platform_register(struct device *dev, 41 struct snd_dmaengine_pcm_config *config, 42 bool (*filter)(struct dma_chan *chan, void *slave)) 43 { 44 *config = spear_dmaengine_pcm_config; 45 config->compat_filter_fn = filter; 46 47 return devm_snd_dmaengine_pcm_register(dev, config, 48 SND_DMAENGINE_PCM_FLAG_NO_DT | 49 SND_DMAENGINE_PCM_FLAG_COMPAT); 50 } 51 EXPORT_SYMBOL_GPL(devm_spear_pcm_platform_register); 52 53 MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>"); 54 MODULE_DESCRIPTION("SPEAr PCM DMA module"); 55 MODULE_LICENSE("GPL"); 56