ACPI / i2c-hid: replace open-coded _DSM code with helper functions

Use helper functions to simplify _DSM related code in i2c-hid driver.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 6 insertions, 20 deletions

diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 5f7e55f4b7f0..d22668f7d982 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -850,37 +850,23 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client,
                 0xF7, 0xF6, 0xDF, 0x3C, 0x67, 0x42, 0x55, 0x45,
                 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE,
         };
-        union acpi_object params[4];
-        struct acpi_object_list input;
+        union acpi_object *obj;
         struct acpi_device *adev;
-        unsigned long long value;
         acpi_handle handle;
 
         handle = ACPI_HANDLE(&client->dev);
         if (!handle || acpi_bus_get_device(handle, &adev))
                 return -ENODEV;
 
-        input.count = ARRAY_SIZE(params);
-        input.pointer = params;
-
-        params[0].type = ACPI_TYPE_BUFFER;
-        params[0].buffer.length = sizeof(i2c_hid_guid);
-        params[0].buffer.pointer = i2c_hid_guid;
-        params[1].type = ACPI_TYPE_INTEGER;
-        params[1].integer.value = 1;
-        params[2].type = ACPI_TYPE_INTEGER;
-        params[2].integer.value = 1; /* HID function */
-        params[3].type = ACPI_TYPE_PACKAGE;
-        params[3].package.count = 0;
-        params[3].package.elements = NULL;
-
-        if (ACPI_FAILURE(acpi_evaluate_integer(handle, "_DSM", &input,
-                                                                &value))) {
+        obj = acpi_evaluate_dsm_typed(handle, i2c_hid_guid, 1, 1, NULL,
+                                      ACPI_TYPE_INTEGER);
+        if (!obj) {
                 dev_err(&client->dev, "device _DSM execution failed\n");
                 return -ENODEV;
         }
 
-        pdata->hid_descriptor_address = value;
+        pdata->hid_descriptor_address = obj->integer.value;
+        ACPI_FREE(obj);
 
         return 0;
 }