ASoC: Intel: Skylake: Report Platform ID info from NHLT

This patch create entry in sysfs file system to report the
platform_id = "pci-id-oem_id-oem_table_id-oem_revision"
for board identification.
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Sodhi, VunnyX <vunnyx.sodhi@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/skylake/skl-nhlt.c

@@ -189,9 +189,9 @@ int skl_get_dmic_geo(struct skl *skl)
 	return dmic_geo;
 }
 
-static void skl_nhlt_trim_space(struct skl *skl)
+static void skl_nhlt_trim_space(char *trim)
 {
-	char *s = skl->tplg_name;
+	char *s = trim;
 	int cnt;
 	int i;
 
@@ -218,7 +218,43 @@ int skl_nhlt_update_topology_bin(struct skl *skl)
 		skl->pci_id, nhlt->header.oem_id, nhlt->header.oem_table_id,
 		nhlt->header.oem_revision, "-tplg.bin");
 
-	skl_nhlt_trim_space(skl);
+	skl_nhlt_trim_space(skl->tplg_name);
 
 	return 0;
 }
+
+static ssize_t skl_nhlt_platform_id_show(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	struct pci_dev *pci = to_pci_dev(dev);
+	struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
+	struct skl *skl = ebus_to_skl(ebus);
+	struct nhlt_acpi_table *nhlt = (struct nhlt_acpi_table *)skl->nhlt;
+	char platform_id[32];
+
+	sprintf(platform_id, "%x-%.6s-%.8s-%d", skl->pci_id,
+			nhlt->header.oem_id, nhlt->header.oem_table_id,
+			nhlt->header.oem_revision);
+
+	skl_nhlt_trim_space(platform_id);
+	return sprintf(buf, "%s\n", platform_id);
+}
+
+static DEVICE_ATTR(platform_id, 0444, skl_nhlt_platform_id_show, NULL);
+
+int skl_nhlt_create_sysfs(struct skl *skl)
+{
+	struct device *dev = &skl->pci->dev;
+
+	if (sysfs_create_file(&dev->kobj, &dev_attr_platform_id.attr))
+		dev_warn(dev, "Error creating sysfs entry\n");
+
+	return 0;
+}
+
+void skl_nhlt_remove_sysfs(struct skl *skl)
+{
+	struct device *dev = &skl->pci->dev;
+
+	sysfs_remove_file(&dev->kobj, &dev_attr_platform_id.attr);
+}

sound/soc/intel/skylake/skl.c

@@ -732,6 +732,10 @@ static int skl_probe(struct pci_dev *pci,
 		goto out_display_power_off;
 	}
 
+	err = skl_nhlt_create_sysfs(skl);
+	if (err < 0)
+		goto out_nhlt_free;
+
 	skl_nhlt_update_topology_bin(skl);
 
 	pci_set_drvdata(skl->pci, ebus);
@@ -852,6 +856,7 @@ static void skl_remove(struct pci_dev *pci)
 	skl_free_dsp(skl);
 	skl_machine_device_unregister(skl);
 	skl_dmic_device_unregister(skl);
+	skl_nhlt_remove_sysfs(skl);
 	skl_nhlt_free(skl->nhlt);
 	skl_free(ebus);
 	dev_set_drvdata(&pci->dev, NULL);

sound/soc/intel/skylake/skl.h

@@ -130,5 +130,7 @@ int skl_resume_dsp(struct skl *skl);
 void skl_cleanup_resources(struct skl *skl);
 const struct skl_dsp_ops *skl_get_dsp_ops(int pci_id);
 void skl_update_d0i3c(struct device *dev, bool enable);
+int skl_nhlt_create_sysfs(struct skl *skl);
+void skl_nhlt_remove_sysfs(struct skl *skl);
 
 #endif /* __SOUND_SOC_SKL_H */