diff options
Diffstat (limited to 'sound/soc/soc-utils.c')
| -rw-r--r-- | sound/soc/soc-utils.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/sound/soc/soc-utils.c b/sound/soc/soc-utils.c new file mode 100644 index 00000000..60053709 --- /dev/null +++ b/sound/soc/soc-utils.c @@ -0,0 +1,158 @@ +/* + * soc-util.c -- ALSA SoC Audio Layer utility functions + * + * Copyright 2009 Wolfson Microelectronics PLC. + * + * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> + * Liam Girdwood <lrg@slimlogic.co.uk> + * + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <linux/platform_device.h> +#include <linux/export.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots) +{ + return sample_size * channels * tdm_slots; +} +EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size); + +int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params) +{ + int sample_size; + + sample_size = snd_pcm_format_width(params_format(params)); + if (sample_size < 0) + return sample_size; + + return snd_soc_calc_frame_size(sample_size, params_channels(params), + 1); +} +EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size); + +int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots) +{ + return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots); +} +EXPORT_SYMBOL_GPL(snd_soc_calc_bclk); + +int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params) +{ + int ret; + + ret = snd_soc_params_to_frame_size(params); + + if (ret > 0) + return ret * params_rate(params); + else + return ret; +} +EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk); + +static const struct snd_pcm_hardware dummy_dma_hardware = { + .formats = 0xffffffff, + .channels_min = 1, + .channels_max = UINT_MAX, + + /* Random values to keep userspace happy when checking constraints */ + .info = SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_BLOCK_TRANSFER, + .buffer_bytes_max = 128*1024, + .period_bytes_min = PAGE_SIZE, + .period_bytes_max = PAGE_SIZE*2, + .periods_min = 2, + .periods_max = 128, +}; + +static int dummy_dma_open(struct snd_pcm_substream *substream) +{ + snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware); + + return 0; +} + +static struct snd_pcm_ops dummy_dma_ops = { + .open = dummy_dma_open, + .ioctl = snd_pcm_lib_ioctl, +}; + +static struct snd_soc_platform_driver dummy_platform = { + .ops = &dummy_dma_ops, +}; + +static struct snd_soc_codec_driver dummy_codec; +static struct snd_soc_dai_driver dummy_dai = { + .name = "snd-soc-dummy-dai", +}; + +static __devinit int snd_soc_dummy_probe(struct platform_device *pdev) +{ + int ret; + + ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1); + if (ret < 0) + return ret; + + ret = snd_soc_register_platform(&pdev->dev, &dummy_platform); + if (ret < 0) { + snd_soc_unregister_codec(&pdev->dev); + return ret; + } + + return ret; +} + +static __devexit int snd_soc_dummy_remove(struct platform_device *pdev) +{ + snd_soc_unregister_platform(&pdev->dev); + snd_soc_unregister_codec(&pdev->dev); + + return 0; +} + +static struct platform_driver soc_dummy_driver = { + .driver = { + .name = "snd-soc-dummy", + .owner = THIS_MODULE, + }, + .probe = snd_soc_dummy_probe, + .remove = __devexit_p(snd_soc_dummy_remove), +}; + +static struct platform_device *soc_dummy_dev; + +int __init snd_soc_util_init(void) +{ + int ret; + + soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1); + if (!soc_dummy_dev) + return -ENOMEM; + + ret = platform_device_add(soc_dummy_dev); + if (ret != 0) { + platform_device_put(soc_dummy_dev); + return ret; + } + + ret = platform_driver_register(&soc_dummy_driver); + if (ret != 0) + platform_device_unregister(soc_dummy_dev); + + return ret; +} + +void __exit snd_soc_util_exit(void) +{ + platform_device_unregister(soc_dummy_dev); + platform_driver_unregister(&soc_dummy_driver); +} |