macintosh/via-pmu68k: Don't load driver on unsupported hardware

Don't load the via-pmu68k driver on early PowerBooks. The M50753 PMU
device found in those models was never supported by this driver.
Attempting to load the driver usually causes a boot hang.
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Michael Schmitz <schmitzmic@gmail.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/m68k/mac/misc.c

@@ -478,8 +478,7 @@ void mac_poweroff(void)
 		cuda_shutdown();
 #endif
 #ifdef CONFIG_ADB_PMU68K
-	} else if (macintosh_config->adb_type == MAC_ADB_PB1
-		|| macintosh_config->adb_type == MAC_ADB_PB2) {
+	} else if (macintosh_config->adb_type == MAC_ADB_PB2) {
 		pmu_shutdown();
 #endif
 	}
@@ -520,8 +519,7 @@ void mac_reset(void)
 		cuda_restart();
 #endif
 #ifdef CONFIG_ADB_PMU68K
-	} else if (macintosh_config->adb_type == MAC_ADB_PB1
-		|| macintosh_config->adb_type == MAC_ADB_PB2) {
+	} else if (macintosh_config->adb_type == MAC_ADB_PB2) {
 		pmu_restart();
 #endif
 	} else if (CPU_IS_030) {

drivers/macintosh/via-pmu68k.c

@@ -175,9 +175,6 @@ static s8 pmu_data_len[256][2] = {
 int __init find_via_pmu(void)
 {
 	switch (macintosh_config->adb_type) {
-	case MAC_ADB_PB1:
-		pmu_kind = PMU_68K_V1;
-		break;
 	case MAC_ADB_PB2:
 		pmu_kind = PMU_68K_V2;
 		break;
@@ -785,7 +782,6 @@ pmu_enable_backlight(int on)
 	    /* first call: get current backlight value */
 	    if (backlight_level < 0) {
 		switch(pmu_kind) {
-		    case PMU_68K_V1:
 		    case PMU_68K_V2:
 			pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
 			while (!req.complete)

include/uapi/linux/pmu.h

@@ -93,7 +93,7 @@ enum {
 	PMU_HEATHROW_BASED,	/* PowerBook G3 series */
 	PMU_PADDINGTON_BASED,	/* 1999 PowerBook G3 */
 	PMU_KEYLARGO_BASED,	/* Core99 motherboard (PMU99) */
-	PMU_68K_V1,		/* 68K PMU, version 1 */
+	PMU_68K_V1,		/* Unused/deprecated */
 	PMU_68K_V2, 		/* 68K PMU, version 2 */
 };