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authorHans de Goede <hdegoede@redhat.com>2020-05-07 13:49:16 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-05-09 12:40:25 +0300
commit132565d8ec096a5a043f96092cfa4821d970d268 (patch)
tree921eb3576cf482019f614a55c9ea93a03b5439b8 /drivers/acpi/utils.c
parent0e698dfa282211e414076f9dc7e83c1c288314fd (diff)
downloadlinux-132565d8ec096a5a043f96092cfa4821d970d268.tar.xz
ACPI: utils: Add acpi_evaluate_reg() helper
With a recent fix to the pinctrl-cherryview driver we now have 2 drivers open-coding the parameter building / passing for calling _REG on an ACPI handle. Add a helper for this, so that these 2 drivers can be converted to this helper. Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/utils.c')
-rw-r--r--drivers/acpi/utils.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 804ac0df58ec..838b719ec7ce 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -606,6 +606,31 @@ acpi_status acpi_evaluate_lck(acpi_handle handle, int lock)
}
/**
+ * acpi_evaluate_reg: Evaluate _REG method to register OpRegion presence
+ * @handle: ACPI device handle
+ * @space_id: ACPI address space id to register OpRegion presence for
+ * @function: Parameter to pass to _REG one of ACPI_REG_CONNECT or
+ * ACPI_REG_DISCONNECT
+ *
+ * Evaluate device's _REG method to register OpRegion presence.
+ */
+acpi_status acpi_evaluate_reg(acpi_handle handle, u8 space_id, u32 function)
+{
+ struct acpi_object_list arg_list;
+ union acpi_object params[2];
+
+ params[0].type = ACPI_TYPE_INTEGER;
+ params[0].integer.value = space_id;
+ params[1].type = ACPI_TYPE_INTEGER;
+ params[1].integer.value = function;
+ arg_list.count = 2;
+ arg_list.pointer = params;
+
+ return acpi_evaluate_object(handle, "_REG", &arg_list, NULL);
+}
+EXPORT_SYMBOL(acpi_evaluate_reg);
+
+/**
* acpi_evaluate_dsm - evaluate device's _DSM method
* @handle: ACPI device handle
* @guid: GUID of requested functions, should be 16 bytes