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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>
This commit is contained in:
Jiang Liu 2013-12-19 20:38:19 +08:00 committed by Rafael J. Wysocki
parent 1569a4c4ce
commit ea547d7db0
1 changed files with 6 additions and 20 deletions
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26
drivers/hid/i2c-hid/i2c-hid.c
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@ -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;
}