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Commit 99463b3a authored by Vinod Koul's avatar Vinod Koul Committed by Takashi Iwai
Browse files

ALSA: hda: provide default bus io ops extended hdac 



A typical io ops use simple io accessors which can be common for most
drivers, so provide a default ops which will be used if driver doesn't
provide one

Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent bab4445f

sound/hda/ext/hdac_ext_bus.c

+58 −1
Original line number Diff line number Diff line
@@ -24,12 +24,65 @@ 
MODULE_DESCRIPTION("HDA extended core");

MODULE_LICENSE("GPL v2");



static void hdac_ext_writel(u32 value, u32 __iomem *addr)

{

	writel(value, addr);

}



static u32 hdac_ext_readl(u32 __iomem *addr)

{

	return readl(addr);

}



static void hdac_ext_writew(u16 value, u16 __iomem *addr)

{

	writew(value, addr);

}



static u16 hdac_ext_readw(u16 __iomem *addr)

{

	return readw(addr);

}



static void hdac_ext_writeb(u8 value, u8 __iomem *addr)

{

	writeb(value, addr);

}



static u8 hdac_ext_readb(u8 __iomem *addr)

{

	return readb(addr);

}



static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type,

			   size_t size, struct snd_dma_buffer *buf)

{

	return snd_dma_alloc_pages(type, bus->dev, size, buf);

}



static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)

{

	snd_dma_free_pages(buf);

}



static const struct hdac_io_ops hdac_ext_default_io = {

	.reg_writel = hdac_ext_writel,

	.reg_readl = hdac_ext_readl,

	.reg_writew = hdac_ext_writew,

	.reg_readw = hdac_ext_readw,

	.reg_writeb = hdac_ext_writeb,

	.reg_readb = hdac_ext_readb,

	.dma_alloc_pages = hdac_ext_dma_alloc_pages,

	.dma_free_pages = hdac_ext_dma_free_pages,

};



/**

 * snd_hdac_ext_bus_init - initialize a HD-audio extended bus

 * @ebus: the pointer to extended bus object

 * @dev: device pointer

 * @ops: bus verb operators

 * @io_ops: lowlevel I/O operators

 * @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use

 * default ops

 *

 * Returns 0 if successful, or a negative error code.

 */
@@ -40,6 +93,10 @@ int snd_hdac_ext_bus_init(struct hdac_ext_bus *ebus, struct device *dev, 
	int ret;

	static int idx;



	/* check if io ops are provided, if not load the defaults */

	if (io_ops == NULL)

		io_ops = &hdac_ext_default_io;



	ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops);

	if (ret < 0)

		return ret;