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-rw-r--r--sound/hda/hdac_controller.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/sound/hda/hdac_controller.c b/sound/hda/hdac_controller.c
index 9fee464e5d49..043065867656 100644
--- a/sound/hda/hdac_controller.c
+++ b/sound/hda/hdac_controller.c
@@ -255,6 +255,81 @@ int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_get_response);
+#define HDAC_MAX_CAPS 10
+/**
+ * snd_hdac_bus_parse_capabilities - parse capability structure
+ * @bus: the pointer to bus object
+ *
+ * Returns 0 if successful, or a negative error code.
+ */
+int snd_hdac_bus_parse_capabilities(struct hdac_bus *bus)
+{
+ unsigned int cur_cap;
+ unsigned int offset;
+ unsigned int counter = 0;
+
+ offset = snd_hdac_chip_readl(bus, LLCH);
+
+ /* Lets walk the linked capabilities list */
+ do {
+ cur_cap = _snd_hdac_chip_read(l, bus, offset);
+
+ dev_dbg(bus->dev, "Capability version: 0x%x\n",
+ (cur_cap & AZX_CAP_HDR_VER_MASK) >> AZX_CAP_HDR_VER_OFF);
+
+ dev_dbg(bus->dev, "HDA capability ID: 0x%x\n",
+ (cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF);
+
+ switch ((cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF) {
+ case AZX_ML_CAP_ID:
+ dev_dbg(bus->dev, "Found ML capability\n");
+ bus->mlcap = bus->remap_addr + offset;
+ break;
+
+ case AZX_GTS_CAP_ID:
+ dev_dbg(bus->dev, "Found GTS capability offset=%x\n", offset);
+ bus->gtscap = bus->remap_addr + offset;
+ break;
+
+ case AZX_PP_CAP_ID:
+ /* PP capability found, the Audio DSP is present */
+ dev_dbg(bus->dev, "Found PP capability offset=%x\n", offset);
+ bus->ppcap = bus->remap_addr + offset;
+ break;
+
+ case AZX_SPB_CAP_ID:
+ /* SPIB capability found, handler function */
+ dev_dbg(bus->dev, "Found SPB capability\n");
+ bus->spbcap = bus->remap_addr + offset;
+ break;
+
+ case AZX_DRSM_CAP_ID:
+ /* DMA resume capability found, handler function */
+ dev_dbg(bus->dev, "Found DRSM capability\n");
+ bus->drsmcap = bus->remap_addr + offset;
+ break;
+
+ default:
+ dev_dbg(bus->dev, "Unknown capability %d\n", cur_cap);
+ break;
+ }
+
+ counter++;
+
+ if (counter > HDAC_MAX_CAPS) {
+ dev_err(bus->dev, "We exceeded HDAC capabilities!!!\n");
+ break;
+ }
+
+ /* read the offset of next capability */
+ offset = cur_cap & AZX_CAP_HDR_NXT_PTR_MASK;
+
+ } while (offset);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_bus_parse_capabilities);
+
/*
* Lowlevel interface
*/