ACPI: AC: Define ACPI_AC_CLASS in one place

The ACPI_AC_CLASS symbol is defined in several places in the same way
which is rather unfortunate.

Instead, define it in one common header file (acpi_bus.h) so that it is
accessible to all of its users.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://patch.msgid.link/6163384.MhkbZ0Pkbq@rafael.j.wysocki

Author: rafaeljw

drivers/acpi/ac.c

@@ -21,7 +21,6 @@
 #include <linux/acpi.h>
 #include <acpi/battery.h>
 
-#define ACPI_AC_CLASS			"ac_adapter"
 #define ACPI_AC_FILE_STATE		"state"
 #define ACPI_AC_NOTIFY_STATUS		0x80
 #define ACPI_AC_STATUS_OFFLINE		0x00

drivers/acpi/sbs.c

@@ -26,7 +26,6 @@
 
 #include "sbshc.h"
 
-#define ACPI_AC_CLASS			"ac_adapter"
 #define ACPI_SBS_DEVICE_NAME		"Smart Battery System"
 #define ACPI_BATTERY_DIR_NAME		"BAT%i"
 #define ACPI_AC_DIR_NAME		"AC0"

drivers/gpu/drm/amd/include/amd_acpi.h

@@ -26,8 +26,6 @@
 
 #include <linux/types.h>
 
-#define ACPI_AC_CLASS           "ac_adapter"
-
 struct atif_verify_interface {
 	u16 size;		/* structure size in bytes (includes size field) */
 	u16 version;		/* version */

drivers/gpu/drm/radeon/radeon_acpi.c

@@ -44,8 +44,6 @@ bool radeon_atpx_dgpu_req_power_for_displays(void);
 static inline bool radeon_atpx_dgpu_req_power_for_displays(void) { return false; }
 #endif
 
-#define ACPI_AC_CLASS           "ac_adapter"
-
 struct atif_verify_interface {
 	u16 size;		/* structure size in bytes (includes size field) */
 	u16 version;		/* version */

drivers/platform/x86/hp/hp-wmi.c

@@ -58,8 +58,6 @@ enum hp_ec_offsets {
 #define HP_POWER_LIMIT_DEFAULT	 0x00
 #define HP_POWER_LIMIT_NO_CHANGE 0xFF
 
-#define ACPI_AC_CLASS "ac_adapter"
-
 #define zero_if_sup(tmp) (zero_insize_support?0:sizeof(tmp)) // use when zero insize is required
 
 enum hp_thermal_profile_omen_v0 {

drivers/platform/x86/lenovo/wmi-capdata.c

@@ -53,7 +53,6 @@
 #define LENOVO_CAPABILITY_DATA_01_GUID "7A8F5407-CB67-4D6E-B547-39B3BE018154"
 #define LENOVO_FAN_TEST_DATA_GUID "B642801B-3D21-45DE-90AE-6E86F164FB21"
 
-#define ACPI_AC_CLASS "ac_adapter"
 #define ACPI_AC_NOTIFY_STATUS 0x80
 
 #define LWMI_FEATURE_ID_FAN_TEST 0x05

include/acpi/acpi_bus.h

@@ -613,6 +613,8 @@ struct acpi_bus_event {
 	u32 data;
 };
 
+#define ACPI_AC_CLASS	"ac_adapter"
+
 extern struct kobject *acpi_kobj;
 extern int acpi_bus_generate_netlink_event(const char*, const char*, u8, int);
 void acpi_bus_private_data_handler(acpi_handle, void *);