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authorVinod Koul <vinod.koul@intel.com>2015-06-17 11:20:18 +0530
committerTakashi Iwai <tiwai@suse.de>2015-06-17 12:33:43 +0200
commit99463b3a399419b3bd795abce5e10c5de87c98d3 (patch)
tree7a5da4ee0908ee0f8caa91521e4bb832a3d20124 /sound
parentbab4445f9a083f087d0ebb4ba3e9dde669a6b9a5 (diff)
downloadlinux-sh-99463b3a399419b3bd795abce5e10c5de87c98d3.tar.gz
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>
Diffstat (limited to 'sound')
-rw-r--r--sound/hda/ext/hdac_ext_bus.c59
1 files changed, 58 insertions, 1 deletions
diff --git a/sound/hda/ext/hdac_ext_bus.c b/sound/hda/ext/hdac_ext_bus.c
index f1100354c591..0aa5d9eb6c3f 100644
--- a/sound/hda/ext/hdac_ext_bus.c
+++ b/sound/hda/ext/hdac_ext_bus.c
@@ -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;