1 /* 2 * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface 3 * 4 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> 5 * Copyright (C) 2006 Applied Data Systems 6 * 7 * Rewritten for the SoC audio subsystem (Based on PXA2xx code): 8 * Copyright (c) 2008 Ryan Mallon 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/platform_device.h> 18 #include <linux/dmaengine.h> 19 20 #include <sound/pcm.h> 21 #include <sound/soc.h> 22 #include <sound/dmaengine_pcm.h> 23 24 #include <linux/platform_data/dma-ep93xx.h> 25 26 static const struct snd_pcm_hardware ep93xx_pcm_hardware = { 27 .info = (SNDRV_PCM_INFO_MMAP | 28 SNDRV_PCM_INFO_MMAP_VALID | 29 SNDRV_PCM_INFO_INTERLEAVED | 30 SNDRV_PCM_INFO_BLOCK_TRANSFER), 31 32 .rates = SNDRV_PCM_RATE_8000_192000, 33 .rate_min = SNDRV_PCM_RATE_8000, 34 .rate_max = SNDRV_PCM_RATE_192000, 35 36 .formats = (SNDRV_PCM_FMTBIT_S16_LE | 37 SNDRV_PCM_FMTBIT_S24_LE | 38 SNDRV_PCM_FMTBIT_S32_LE), 39 40 .buffer_bytes_max = 131072, 41 .period_bytes_min = 32, 42 .period_bytes_max = 32768, 43 .periods_min = 1, 44 .periods_max = 32, 45 .fifo_size = 32, 46 }; 47 48 static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param) 49 { 50 struct ep93xx_dma_data *data = filter_param; 51 52 if (data->direction == ep93xx_dma_chan_direction(chan)) { 53 chan->private = data; 54 return true; 55 } 56 57 return false; 58 } 59 60 static struct dma_chan *ep93xx_compat_request_channel( 61 struct snd_soc_pcm_runtime *rtd, 62 struct snd_pcm_substream *substream) 63 { 64 struct snd_dmaengine_dai_dma_data *dma_data; 65 66 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); 67 68 return snd_dmaengine_pcm_request_channel(ep93xx_pcm_dma_filter, 69 dma_data); 70 } 71 72 static const struct snd_dmaengine_pcm_config ep93xx_dmaengine_pcm_config = { 73 .pcm_hardware = &ep93xx_pcm_hardware, 74 .compat_filter_fn = ep93xx_pcm_dma_filter, 75 .compat_request_channel = ep93xx_compat_request_channel, 76 .prealloc_buffer_size = 131072, 77 }; 78 79 static int ep93xx_soc_platform_probe(struct platform_device *pdev) 80 { 81 return snd_dmaengine_pcm_register(&pdev->dev, 82 &ep93xx_dmaengine_pcm_config, 83 SND_DMAENGINE_PCM_FLAG_NO_RESIDUE | 84 SND_DMAENGINE_PCM_FLAG_NO_DT | 85 SND_DMAENGINE_PCM_FLAG_COMPAT); 86 } 87 88 static int ep93xx_soc_platform_remove(struct platform_device *pdev) 89 { 90 snd_dmaengine_pcm_unregister(&pdev->dev); 91 return 0; 92 } 93 94 static struct platform_driver ep93xx_pcm_driver = { 95 .driver = { 96 .name = "ep93xx-pcm-audio", 97 .owner = THIS_MODULE, 98 }, 99 100 .probe = ep93xx_soc_platform_probe, 101 .remove = ep93xx_soc_platform_remove, 102 }; 103 104 module_platform_driver(ep93xx_pcm_driver); 105 106 MODULE_AUTHOR("Ryan Mallon"); 107 MODULE_DESCRIPTION("EP93xx ALSA PCM interface"); 108 MODULE_LICENSE("GPL"); 109 MODULE_ALIAS("platform:ep93xx-pcm-audio"); 110