tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * tegra_pcm.c - Tegra PCM driver
4 *
5 * Author: Stephen Warren <swarren@nvidia.com>
6 * Copyright (C) 2010,2012 - NVIDIA, Inc.
7 *
8 * Based on code copyright/by:
9 *
10 * Copyright (c) 2009-2010, NVIDIA Corporation.
11 * Scott Peterson <speterson@nvidia.com>
12 * Vijay Mali <vmali@nvidia.com>
13 *
14 * Copyright (C) 2010 Google, Inc.
15 * Iliyan Malchev <malchev@google.com>
16 */
17
18#include <linux/module.h>
19#include <sound/core.h>
20#include <sound/pcm.h>
21#include <sound/pcm_params.h>
22#include <sound/soc.h>
23#include <sound/dmaengine_pcm.h>
24
25#include "tegra_pcm.h"
26
27static const struct snd_pcm_hardware tegra_pcm_hardware = {
28 .info = SNDRV_PCM_INFO_MMAP |
29 SNDRV_PCM_INFO_MMAP_VALID |
30 SNDRV_PCM_INFO_INTERLEAVED,
31 .period_bytes_min = 1024,
32 .period_bytes_max = PAGE_SIZE,
33 .periods_min = 2,
34 .periods_max = 8,
35 .buffer_bytes_max = PAGE_SIZE * 8,
36 .fifo_size = 4,
37};
38
39static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
40 .pcm_hardware = &tegra_pcm_hardware,
41 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
42 .prealloc_buffer_size = PAGE_SIZE * 8,
43};
44
45int tegra_pcm_platform_register(struct device *dev)
46{
47 return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
48}
49EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
50
51int tegra_pcm_platform_register_with_chan_names(struct device *dev,
52 struct snd_dmaengine_pcm_config *config,
53 char *txdmachan, char *rxdmachan)
54{
55 *config = tegra_dmaengine_pcm_config;
56 config->dma_dev = dev->parent;
57 config->chan_names[0] = txdmachan;
58 config->chan_names[1] = rxdmachan;
59
60 return snd_dmaengine_pcm_register(dev, config, 0);
61}
62EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
63
64void tegra_pcm_platform_unregister(struct device *dev)
65{
66 return snd_dmaengine_pcm_unregister(dev);
67}
68EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
69
70MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
71MODULE_DESCRIPTION("Tegra PCM ASoC driver");
72MODULE_LICENSE("GPL");