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When building modules with CONFIG_SND_IMX_SOC=m in imx_v6_v7_defconfig, we will see the following link error. LD [M] sound/soc/fsl/snd-soc-fsl-ssi.o LD [M] sound/soc/fsl/snd-soc-fsl-utils.o LD [M] sound/soc/fsl/snd-soc-imx-ssi.o LD [M] sound/soc/fsl/snd-soc-imx-audmux.o LD [M] sound/soc/fsl/snd-soc-imx-pcm.o sound/soc/fsl/imx-pcm-dma.o: In function `init_module': imx-pcm-dma.c:(.init.text+0x0): multiple definition of `init_module' sound/soc/fsl/imx-pcm-fiq.o:imx-pcm-fiq.c:(.init.text+0x0): first defined here sound/soc/fsl/imx-pcm-dma.o: In function `cleanup_module': imx-pcm-dma.c:(.exit.text+0x0): multiple definition of `cleanup_module' sound/soc/fsl/imx-pcm-fiq.o:imx-pcm-fiq.c:(.exit.text+0x0): first defined here make[4]: *** [sound/soc/fsl/snd-soc-imx-pcm.o] Error 1 The module snd-soc-imx-pcm is designed to link imx-pcm.o with imx-pcm-dma.o or imx-pcm-fiq.o depending on if option SND_SOC_IMX_PCM_DMA or SND_SOC_IMX_PCM_FIQ is enabled. Both imx-pcm-dma and imx-pcm-fiq register their own module_platform_driver. However, these two options are not mutually exclusive and can be enabled together. And that's why we see above multiple init_module definition error. Instead of having both imx-pcm-dma and imx-pcm-fiq register their own platform_driver, we should do only once in imx-pcm.c. Using platform_device_id to distinguish between imx-pcm-dma and imx-pcm-fiq, we can run-time call imx-pcm-dma/fiq specific initialization in .probe hook to have module snd-soc-imx-pcm work for both cases. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/*
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* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
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*
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* This code is based on code copyrighted by Freescale,
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* Liam Girdwood, Javier Martin and probably others.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#ifndef _IMX_PCM_H
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#define _IMX_PCM_H
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/*
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* Do not change this as the FIQ handler depends on this size
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*/
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#define IMX_SSI_DMABUF_SIZE (64 * 1024)
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struct imx_pcm_dma_params {
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int dma;
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unsigned long dma_addr;
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int burstsize;
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bool shared_peripheral; /* The peripheral is on SPBA bus */
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};
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int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma);
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int imx_pcm_new(struct snd_soc_pcm_runtime *rtd);
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void imx_pcm_free(struct snd_pcm *pcm);
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#ifdef CONFIG_SND_SOC_IMX_PCM_DMA
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int imx_pcm_dma_init(struct platform_device *pdev);
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#else
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static inline int imx_pcm_dma_init(struct platform_device *pdev)
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{
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return -ENODEV;
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}
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#endif
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#ifdef CONFIG_SND_SOC_IMX_PCM_FIQ
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int imx_pcm_fiq_init(struct platform_device *pdev);
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#else
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static inline int imx_pcm_fiq_init(struct platform_device *pdev)
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{
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return -ENODEV;
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}
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#endif
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#endif /* _IMX_PCM_H */
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