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: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -24,12 +24,65 @@
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MODULE_DESCRIPTION("HDA extended core");
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MODULE_DESCRIPTION("HDA extended core");
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MODULE_LICENSE("GPL v2");
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MODULE_LICENSE("GPL v2");
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static void hdac_ext_writel(u32 value, u32 __iomem *addr)
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{
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writel(value, addr);
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}
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static u32 hdac_ext_readl(u32 __iomem *addr)
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{
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return readl(addr);
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}
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static void hdac_ext_writew(u16 value, u16 __iomem *addr)
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{
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writew(value, addr);
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}
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static u16 hdac_ext_readw(u16 __iomem *addr)
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{
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return readw(addr);
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}
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static void hdac_ext_writeb(u8 value, u8 __iomem *addr)
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{
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writeb(value, addr);
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}
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static u8 hdac_ext_readb(u8 __iomem *addr)
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{
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return readb(addr);
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}
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static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type,
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size_t size, struct snd_dma_buffer *buf)
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{
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return snd_dma_alloc_pages(type, bus->dev, size, buf);
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}
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static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)
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{
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snd_dma_free_pages(buf);
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}
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static const struct hdac_io_ops hdac_ext_default_io = {
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.reg_writel = hdac_ext_writel,
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.reg_readl = hdac_ext_readl,
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.reg_writew = hdac_ext_writew,
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.reg_readw = hdac_ext_readw,
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.reg_writeb = hdac_ext_writeb,
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.reg_readb = hdac_ext_readb,
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.dma_alloc_pages = hdac_ext_dma_alloc_pages,
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.dma_free_pages = hdac_ext_dma_free_pages,
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};
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/**
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/**
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* snd_hdac_ext_bus_init - initialize a HD-audio extended bus
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* snd_hdac_ext_bus_init - initialize a HD-audio extended bus
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* @ebus: the pointer to extended bus object
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* @ebus: the pointer to extended bus object
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* @dev: device pointer
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* @dev: device pointer
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* @ops: bus verb operators
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* @ops: bus verb operators
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* @io_ops: lowlevel I/O operators
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* @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use
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* default ops
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*
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*
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* Returns 0 if successful, or a negative error code.
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* Returns 0 if successful, or a negative error code.
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*/
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*/
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@ -40,6 +93,10 @@ int snd_hdac_ext_bus_init(struct hdac_ext_bus *ebus, struct device *dev,
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int ret;
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int ret;
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static int idx;
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static int idx;
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/* check if io ops are provided, if not load the defaults */
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if (io_ops == NULL)
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io_ops = &hdac_ext_default_io;
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ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops);
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ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops);
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if (ret < 0)
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if (ret < 0)
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return ret;
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return ret;
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