Thermal: int3400 thermal: add capability to detect supporting UUIDs

Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/drivers/thermal/int340x_thermal/int3400_thermal.c b/drivers/thermal/int340x_thermal/int3400_thermal.c
index 308c1850edee..65c63ba8b314 100644
--- a/drivers/thermal/int340x_thermal/int3400_thermal.c
+++ b/drivers/thermal/int340x_thermal/int3400_thermal.c
@@ -41,14 +41,79 @@ struct trt {
         u64 reverved4;
 };
 
+enum int3400_thermal_uuid {
+        INT3400_THERMAL_PASSIVE_1,
+        INT3400_THERMAL_PASSIVE_2,
+        INT3400_THERMAL_ACTIVE,
+        INT3400_THERMAL_CRITICAL,
+        INT3400_THERMAL_COOLING_MODE,
+        INT3400_THERMAL_MAXIMUM_UUID,
+};
+
+static u8 *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
+        "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
+        "9E04115A-AE87-4D1C-9500-0F3E340BFE75",
+        "3A95C389-E4B8-4629-A526-C52C88626BAE",
+        "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
+        "16CAF1B7-DD38-40ed-B1C1-1B8A1913D531",
+};
+
 struct int3400_thermal_priv {
         struct acpi_device *adev;
         int art_count;
         struct art *arts;
         int trt_count;
         struct trt *trts;
+        u8 uuid_bitmap;
 };
 
+static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
+{
+        struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
+        union acpi_object *obja, *objb;
+        int i, j;
+        int result = 0;
+        acpi_status status;
+
+        status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
+        if (ACPI_FAILURE(status))
+                return -ENODEV;
+
+        obja = (union acpi_object *)buf.pointer;
+        if (obja->type != ACPI_TYPE_PACKAGE) {
+                result = -EINVAL;
+                goto end;
+        }
+
+        for (i = 0; i < obja->package.count; i++) {
+                objb = &obja->package.elements[i];
+                if (objb->type != ACPI_TYPE_BUFFER) {
+                        result = -EINVAL;
+                        goto end;
+                }
+
+                /* UUID must be 16 bytes */
+                if (objb->buffer.length != 16) {
+                        result = -EINVAL;
+                        goto end;
+                }
+
+                for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
+                        u8 uuid[16];
+
+                        acpi_str_to_uuid(int3400_thermal_uuids[j], uuid);
+                        if (!strncmp(uuid, objb->buffer.pointer, 16)) {
+                                priv->uuid_bitmap |= (1 << j);
+                                break;
+                        }
+                }
+        }
+
+end:
+        kfree(buf.pointer);
+        return result;
+}
+
 static int parse_art(struct int3400_thermal_priv *priv)
 {
         acpi_handle handle = priv->adev->handle;
@@ -193,6 +258,10 @@ static int int3400_thermal_probe(struct platform_device *pdev)
 
         priv->adev = adev;
 
+        result = int3400_thermal_get_uuids(priv);
+        if (result)
+                goto free_priv;
+
         result = parse_art(priv);
         if (result)
                 goto free_priv;