diff --git a/drivers/staging/comedi/drivers/cb_pcidas64.c b/drivers/staging/comedi/drivers/cb_pcidas64.c
index 915157d..6f743df 100644
--- a/drivers/staging/comedi/drivers/cb_pcidas64.c
+++ b/drivers/staging/comedi/drivers/cb_pcidas64.c
@@ -423,6 +423,29 @@
 	 }
 };
 
+static const uint8_t ai_range_code_64xx[8] = {
+	0x0, 0x1, 0x2, 0x3,	/* bipolar 10, 5, 2,5, 1.25 */
+	0x8, 0x9, 0xa, 0xb	/* unipolar 10, 5, 2.5, 1.25 */
+};
+
+/* analog input ranges for 64-Mx boards */
+static const struct comedi_lrange ai_ranges_64_mx = {
+	7, {
+		BIP_RANGE(5),
+		BIP_RANGE(2.5),
+		BIP_RANGE(1.25),
+		BIP_RANGE(0.625),
+		UNI_RANGE(5),
+		UNI_RANGE(2.5),
+		UNI_RANGE(1.25)
+	}
+};
+
+static const uint8_t ai_range_code_64_mx[7] = {
+	0x0, 0x1, 0x2, 0x3,	/* bipolar 5, 2.5, 1.25, 0.625 */
+	0x9, 0xa, 0xb		/* unipolar 5, 2.5, 1.25 */
+};
+
 /* analog input ranges for 60xx boards */
 static const struct comedi_lrange ai_ranges_60xx = {
 	4,
@@ -434,6 +457,10 @@
 	 }
 };
 
+static const uint8_t ai_range_code_60xx[4] = {
+	0x0, 0x1, 0x4, 0x7	/* bipolar 10, 5, 0.5, 0.05 */
+};
+
 /* analog input ranges for 6030, etc boards */
 static const struct comedi_lrange ai_ranges_6030 = {
 	14,
@@ -455,6 +482,11 @@
 	 }
 };
 
+static const uint8_t ai_range_code_6030[14] = {
+	0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, /* bip 10, 5, 2, 1, 0.5, 0.2, 0.1 */
+	0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf  /* uni 10, 5, 2, 1, 0.5, 0.2, 0.1 */
+};
+
 /* analog input ranges for 6052, etc boards */
 static const struct comedi_lrange ai_ranges_6052 = {
 	15,
@@ -477,6 +509,11 @@
 	 }
 };
 
+static const uint8_t ai_range_code_6052[15] = {
+	0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,	/* bipolar 10 ... 0.05 */
+	0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf	/* unipolar 10 ... 0.1 */
+};
+
 /* analog input ranges for 4020 board */
 static const struct comedi_lrange ai_ranges_4020 = {
 	2,
@@ -561,6 +598,7 @@
 	int ai_bits;		/*  analog input resolution */
 	int ai_speed;		/*  fastest conversion period in ns */
 	const struct comedi_lrange *ai_range_table;
+	const uint8_t *ai_range_code;
 	int ao_nchan;		/*  number of analog out channels */
 	int ao_bits;		/*  analog output resolution */
 	int ao_scan_speed;	/*  analog output speed (for a scan, not conversion) */
@@ -619,6 +657,7 @@
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
 	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_code = ai_range_code_64xx,
 	 .ao_range_table = &ao_ranges_64xx,
 	 .ao_range_code = ao_range_code_64xx,
 	 .ai_fifo = &ai_fifo_64xx,
@@ -635,6 +674,7 @@
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
 	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_code = ai_range_code_64xx,
 	 .ao_range_table = &ao_ranges_64xx,
 	 .ao_range_code = ao_range_code_64xx,
 	 .ai_fifo = &ai_fifo_64xx,
@@ -650,7 +690,8 @@
 	 .ao_bits = 16,
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
-	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_table = &ai_ranges_64_mx,
+	 .ai_range_code = ai_range_code_64_mx,
 	 .ao_range_table = &ao_ranges_64xx,
 	 .ao_range_code = ao_range_code_64xx,
 	 .ai_fifo = &ai_fifo_64xx,
@@ -666,7 +707,8 @@
 	 .ao_bits = 16,
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
-	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_table = &ai_ranges_64_mx,
+	 .ai_range_code = ai_range_code_64_mx,
 	 .ao_range_table = &ao_ranges_64xx,
 	 .ao_range_code = ao_range_code_64xx,
 	 .ai_fifo = &ai_fifo_64xx,
@@ -682,7 +724,8 @@
 	 .ao_bits = 16,
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
-	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_table = &ai_ranges_64_mx,
+	 .ai_range_code = ai_range_code_64_mx,
 	 .ao_range_table = &ao_ranges_64xx,
 	 .ao_range_code = ao_range_code_64xx,
 	 .ai_fifo = &ai_fifo_64xx,
@@ -698,6 +741,7 @@
 	 .ao_bits = 16,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_60xx,
+	 .ai_range_code = ai_range_code_60xx,
 	 .ao_range_table = &ao_ranges_60xx,
 	 .ao_range_code = ao_range_code_60xx,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -714,6 +758,7 @@
 	 .ao_scan_speed = 100000,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_60xx,
+	 .ai_range_code = ai_range_code_60xx,
 	 .ao_range_table = &ao_ranges_60xx,
 	 .ao_range_code = ao_range_code_60xx,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -729,6 +774,7 @@
 	 .ao_scan_speed = 100000,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_60xx,
+	 .ai_range_code = ai_range_code_60xx,
 	 .ao_range_table = &ao_ranges_60xx,
 	 .ao_range_code = ao_range_code_60xx,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -745,6 +791,7 @@
 	 .ao_scan_speed = 100000,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_60xx,
+	 .ai_range_code = ai_range_code_60xx,
 	 .ao_range_table = &ao_ranges_60xx,
 	 .ao_range_code = ao_range_code_60xx,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -761,6 +808,7 @@
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_6030,
+	 .ai_range_code = ai_range_code_6030,
 	 .ao_range_table = &ao_ranges_6030,
 	 .ao_range_code = ao_range_code_6030,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -777,6 +825,7 @@
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_6030,
+	 .ai_range_code = ai_range_code_6030,
 	 .ao_range_table = &ao_ranges_6030,
 	 .ao_range_code = ao_range_code_6030,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -791,6 +840,7 @@
 	 .ao_nchan = 0,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_6030,
+	 .ai_range_code = ai_range_code_6030,
 	 .ai_fifo = &ai_fifo_60xx,
 	 .has_8255 = 0,
 	 },
@@ -803,6 +853,7 @@
 	 .ao_nchan = 0,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_6030,
+	 .ai_range_code = ai_range_code_6030,
 	 .ai_fifo = &ai_fifo_60xx,
 	 .has_8255 = 0,
 	 },
@@ -816,6 +867,7 @@
 	 .ao_scan_speed = 0,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_60xx,
+	 .ai_range_code = ai_range_code_60xx,
 	 .ai_fifo = &ai_fifo_60xx,
 	 .has_8255 = 0,
 	 },
@@ -830,6 +882,7 @@
 	 .ao_scan_speed = 100000,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_60xx,
+	 .ai_range_code = ai_range_code_60xx,
 	 .ao_range_table = &ao_ranges_60xx,
 	 .ao_range_code = ao_range_code_60xx,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -846,6 +899,7 @@
 	 .ao_scan_speed = 100000,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_60xx,
+	 .ai_range_code = ai_range_code_60xx,
 	 .ao_range_table = &ao_ranges_60xx,
 	 .ao_range_code = ao_range_code_60xx,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -862,6 +916,7 @@
 	 .ao_scan_speed = 1000,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_6052,
+	 .ai_range_code = ai_range_code_6052,
 	 .ao_range_table = &ao_ranges_6030,
 	 .ao_range_code = ao_range_code_6030,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -878,6 +933,7 @@
 	 .ao_scan_speed = 3333,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_6052,
+	 .ai_range_code = ai_range_code_6052,
 	 .ao_range_table = &ao_ranges_6030,
 	 .ao_range_code = ao_range_code_6030,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -894,6 +950,7 @@
 	 .ao_scan_speed = 1000,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_6052,
+	 .ai_range_code = ai_range_code_6052,
 	 .ao_range_table = &ao_ranges_6030,
 	 .ao_range_code = ao_range_code_6030,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -910,6 +967,7 @@
 	 .ao_scan_speed = 1000,
 	 .layout = LAYOUT_60XX,
 	 .ai_range_table = &ai_ranges_6052,
+	 .ai_range_code = ai_range_code_6052,
 	 .ao_range_table = &ao_ranges_6030,
 	 .ao_range_code = ao_range_code_6030,
 	 .ai_fifo = &ai_fifo_60xx,
@@ -942,6 +1000,7 @@
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
 	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_code = ai_range_code_64xx,
 	 .ai_fifo = ai_fifo_64xx,
 	 .has_8255 = 1,
 	 },
@@ -954,7 +1013,8 @@
 	 .ao_nchan = 0,
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
-	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_table = &ai_ranges_64_mx,
+	 .ai_range_code = ai_range_code_64_mx,
 	 .ai_fifo = ai_fifo_64xx,
 	 .has_8255 = 1,
 	 },
@@ -967,7 +1027,8 @@
 	 .ao_nchan = 0,
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
-	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_table = &ai_ranges_64_mx,
+	 .ai_range_code = ai_range_code_64_mx,
 	 .ai_fifo = ai_fifo_64xx,
 	 .has_8255 = 1,
 	 },
@@ -980,7 +1041,8 @@
 	 .ao_nchan = 0,
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
-	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_table = &ai_ranges_64_mx,
+	 .ai_range_code = ai_range_code_64_mx,
 	 .ai_fifo = ai_fifo_64xx,
 	 .has_8255 = 1,
 	 },
@@ -993,7 +1055,8 @@
 	 .ao_nchan = 2,
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
-	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_table = &ai_ranges_64_mx,
+	 .ai_range_code = ai_range_code_64_mx,
 	 .ai_fifo = ai_fifo_64xx,
 	 .has_8255 = 1,
 	 },
@@ -1006,7 +1069,8 @@
 	 .ao_nchan = 2,
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
-	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_table = &ai_ranges_64_mx,
+	 .ai_range_code = ai_range_code_64_mx,
 	 .ai_fifo = ai_fifo_64xx,
 	 .has_8255 = 1,
 	 },
@@ -1019,7 +1083,8 @@
 	 .ao_nchan = 2,
 	 .ao_scan_speed = 10000,
 	 .layout = LAYOUT_64XX,
-	 .ai_range_table = &ai_ranges_64xx,
+	 .ai_range_table = &ai_ranges_64_mx,
+	 .ai_range_code = ai_range_code_64_mx,
 	 .ai_fifo = ai_fifo_64xx,
 	 .has_8255 = 1,
 	 },
@@ -1257,45 +1322,7 @@
 static unsigned int ai_range_bits_6xxx(const struct comedi_device *dev,
 				       unsigned int range_index)
 {
-	const struct comedi_krange *range =
-	    &board(dev)->ai_range_table->range[range_index];
-	unsigned int bits = 0;
-
-	switch (range->max) {
-	case 10000000:
-		bits = 0x000;
-		break;
-	case 5000000:
-		bits = 0x100;
-		break;
-	case 2000000:
-	case 2500000:
-		bits = 0x200;
-		break;
-	case 1000000:
-	case 1250000:
-		bits = 0x300;
-		break;
-	case 500000:
-		bits = 0x400;
-		break;
-	case 200000:
-	case 250000:
-		bits = 0x500;
-		break;
-	case 100000:
-		bits = 0x600;
-		break;
-	case 50000:
-		bits = 0x700;
-		break;
-	default:
-		comedi_error(dev, "bug! in ai_range_bits_6xxx");
-		break;
-	}
-	if (range->min == 0)
-		bits += 0x900;
-	return bits;
+	return board(dev)->ai_range_code[range_index] << 8;
 }
 
 static unsigned int hw_revision(const struct comedi_device *dev,