ALSA: hda - move bus_parse_capabilities to core

HDA capability introduced recently are move to hdac core so that it can
be used by legacy driver as well. Also move the capability pointers up
to hdac_bus object.

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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
  */