[RFC 02/10] ASoC: Intel: Skylake: Add entry in sst_acpi_mach for HDA codecs

[Rakesh Ughreja <rakesh.a.ughreja@intel.com>]

When no I2S based codecs are detected in the BIOS, check if there are
any HDA codecs present. If yes, load the corresponding machine driver.

TODO:
support for detecting the presence of HDA codec is not implemented.
it will be implemented in the next revision.

Signed-off-by: Rakesh Ughreja <rakesh.a.ughreja@intel.com>
---
 sound/soc/intel/skylake/skl.c | 46 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 43 insertions(+), 3 deletions(-)

diff --git a/sound/soc/intel/skylake/skl.c b/sound/soc/intel/skylake/skl.c
index 27462c0..568a285 100644
--- a/sound/soc/intel/skylake/skl.c
+++ b/sound/soc/intel/skylake/skl.c
@@ -424,6 +424,26 @@ static int skl_free(struct hdac_bus *bus)
 	return 0;
 }
 
+static struct snd_soc_acpi_mach *skl_probe_hda_machine(
+					struct snd_soc_acpi_mach *machines)
+{
+
+	struct snd_soc_acpi_mach *mach;
+
+	/*
+	 * FIXME:
+	 * First check if there are any HDA codecs present on the system
+	 * then search the match table.
+	 * For now this function is not detecting the presence of any
+	 * HDA codecs.
+	 */
+	for (mach = machines; mach->id[0]; mach++) {
+		if (!strcmp(mach->id, "HDA_GEN"))
+			return mach;
+	}
+	return NULL;
+}
+
 static int skl_machine_device_register(struct skl *skl, void *driver_data)
 {
 	struct hdac_bus *bus = skl_to_bus(skl);
@@ -433,9 +453,14 @@ static int skl_machine_device_register(struct skl *skl, void *driver_data)
 
 	mach = snd_soc_acpi_find_machine(mach);
 	if (mach == NULL) {
-		dev_err(bus->dev, "No matching machine driver found\n");
-		return -ENODEV;
+		dev_dbg(bus->dev, "No matching I2S machine driver found\n");
+		mach = skl_probe_hda_machine(driver_data);
+		if (mach == NULL) {
+			dev_err(bus->dev, "No matching machine driver found\n");
+			return -ENODEV;
+		}
 	}
+
 	skl->fw_name = mach->fw_filename;
 
 	pdev = platform_device_alloc(mach->drv_name, -1);
@@ -911,6 +936,14 @@ static struct snd_soc_acpi_mach sst_skl_devdata[] = {
 		.quirk_data = &skl_codecs,
 		.pdata = &skl_dmic_data
 	},
+	{
+		.id = "HDA_GEN",
+		.drv_name = "skl_hda_generic",
+		.fw_filename = "intel/dsp_fw_release.bin",
+		.machine_quirk = NULL,
+		.quirk_data = NULL,
+		.pdata = NULL
+	},
 	{}
 };
 
@@ -973,7 +1006,14 @@ static struct snd_soc_acpi_mach sst_kbl_devdata[] = {
 		.drv_name = "kbl_rt5663",
 		.fw_filename = "intel/dsp_fw_kbl.bin",
 	},
-
+	{
+		.id = "HDA_GEN",
+		.drv_name = "skl_hda_generic",
+		.fw_filename = "intel/dsp_fw_kbl.bin",
+		.machine_quirk = NULL,
+		.quirk_data = NULL,
+		.pdata = NULL
+	},
 	{}
 };
 
-- 
2.7.4