1 /* 2 * tegra_pcm.c - Tegra PCM driver 3 * 4 * Author: Stephen Warren <swarren@nvidia.com> 5 * Copyright (C) 2010,2012 - NVIDIA, Inc. 6 * 7 * Based on code copyright/by: 8 * 9 * Copyright (c) 2009-2010, NVIDIA Corporation. 10 * Scott Peterson <speterson@nvidia.com> 11 * Vijay Mali <vmali@nvidia.com> 12 * 13 * Copyright (C) 2010 Google, Inc. 14 * Iliyan Malchev <malchev@google.com> 15 * 16 * This program is free software; you can redistribute it and/or 17 * modify it under the terms of the GNU General Public License 18 * version 2 as published by the Free Software Foundation. 19 * 20 * This program is distributed in the hope that it will be useful, but 21 * WITHOUT ANY WARRANTY; without even the implied warranty of 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 23 * General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, write to the Free Software 27 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 28 * 02110-1301 USA 29 * 30 */ 31 32 #include <linux/module.h> 33 #include <sound/core.h> 34 #include <sound/pcm.h> 35 #include <sound/pcm_params.h> 36 #include <sound/soc.h> 37 #include <sound/dmaengine_pcm.h> 38 39 #include "tegra_pcm.h" 40 41 static const struct snd_pcm_hardware tegra_pcm_hardware = { 42 .info = SNDRV_PCM_INFO_MMAP | 43 SNDRV_PCM_INFO_MMAP_VALID | 44 SNDRV_PCM_INFO_INTERLEAVED, 45 .period_bytes_min = 1024, 46 .period_bytes_max = PAGE_SIZE, 47 .periods_min = 2, 48 .periods_max = 8, 49 .buffer_bytes_max = PAGE_SIZE * 8, 50 .fifo_size = 4, 51 }; 52 53 static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = { 54 .pcm_hardware = &tegra_pcm_hardware, 55 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, 56 .prealloc_buffer_size = PAGE_SIZE * 8, 57 }; 58 59 int tegra_pcm_platform_register(struct device *dev) 60 { 61 return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0); 62 } 63 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register); 64 65 int tegra_pcm_platform_register_with_chan_names(struct device *dev, 66 struct snd_dmaengine_pcm_config *config, 67 char *txdmachan, char *rxdmachan) 68 { 69 *config = tegra_dmaengine_pcm_config; 70 config->dma_dev = dev->parent; 71 config->chan_names[0] = txdmachan; 72 config->chan_names[1] = rxdmachan; 73 74 return snd_dmaengine_pcm_register(dev, config, 0); 75 } 76 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names); 77 78 void tegra_pcm_platform_unregister(struct device *dev) 79 { 80 return snd_dmaengine_pcm_unregister(dev); 81 } 82 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister); 83 84 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); 85 MODULE_DESCRIPTION("Tegra PCM ASoC driver"); 86 MODULE_LICENSE("GPL"); 87