mirror of https://gitee.com/openkylin/linux.git
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/*
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* mtk-afe-platform-driver.c -- Mediatek afe platform driver
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*
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* Copyright (c) 2016 MediaTek Inc.
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* Author: Garlic Tseng <garlic.tseng@mediatek.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/dma-mapping.h>
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#include <sound/soc.h>
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#include "mtk-afe-platform-driver.h"
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#include "mtk-base-afe.h"
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static snd_pcm_uframes_t mtk_afe_pcm_pointer
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(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct mtk_base_afe *afe = snd_soc_platform_get_drvdata(rtd->platform);
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struct mtk_base_afe_memif *memif = &afe->memif[rtd->cpu_dai->id];
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const struct mtk_base_memif_data *memif_data = memif->data;
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struct regmap *regmap = afe->regmap;
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struct device *dev = afe->dev;
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int reg_ofs_base = memif_data->reg_ofs_base;
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int reg_ofs_cur = memif_data->reg_ofs_cur;
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unsigned int hw_ptr = 0, hw_base = 0;
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int ret, pcm_ptr_bytes;
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ret = regmap_read(regmap, reg_ofs_cur, &hw_ptr);
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if (ret || hw_ptr == 0) {
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dev_err(dev, "%s hw_ptr err\n", __func__);
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pcm_ptr_bytes = 0;
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goto POINTER_RETURN_FRAMES;
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}
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ret = regmap_read(regmap, reg_ofs_base, &hw_base);
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if (ret || hw_base == 0) {
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dev_err(dev, "%s hw_ptr err\n", __func__);
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pcm_ptr_bytes = 0;
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goto POINTER_RETURN_FRAMES;
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}
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pcm_ptr_bytes = hw_ptr - hw_base;
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POINTER_RETURN_FRAMES:
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return bytes_to_frames(substream->runtime, pcm_ptr_bytes);
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}
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static const struct snd_pcm_ops mtk_afe_pcm_ops = {
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.ioctl = snd_pcm_lib_ioctl,
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.pointer = mtk_afe_pcm_pointer,
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};
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static int mtk_afe_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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size_t size;
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struct snd_card *card = rtd->card->snd_card;
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struct snd_pcm *pcm = rtd->pcm;
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struct mtk_base_afe *afe = snd_soc_platform_get_drvdata(rtd->platform);
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size = afe->mtk_afe_hardware->buffer_bytes_max;
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return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
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card->dev, size, size);
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}
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static void mtk_afe_pcm_free(struct snd_pcm *pcm)
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{
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snd_pcm_lib_preallocate_free_for_all(pcm);
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}
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const struct snd_soc_platform_driver mtk_afe_pcm_platform = {
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.ops = &mtk_afe_pcm_ops,
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.pcm_new = mtk_afe_pcm_new,
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.pcm_free = mtk_afe_pcm_free,
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};
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EXPORT_SYMBOL_GPL(mtk_afe_pcm_platform);
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MODULE_DESCRIPTION("Mediatek simple platform driver");
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MODULE_AUTHOR("Garlic Tseng <garlic.tseng@mediatek.com>");
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MODULE_LICENSE("GPL v2");
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