i2c: piix4: Replace hardcoded memory map size with a #define

Replace number constant with #define to improve readability and
maintainability.
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-piix4.c

@@ -77,6 +77,7 @@
 
 /* SB800 constants */
 #define SB800_PIIX4_SMB_IDX		0xcd6
+#define SB800_PIIX4_SMB_MAP_SIZE	2
 
 #define KERNCZ_IMC_IDX			0x3e
 #define KERNCZ_IMC_DATA			0x3f
@@ -290,7 +291,8 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
 	else
 		smb_en = (aux) ? 0x28 : 0x2c;
 
-	if (!request_muxed_region(SB800_PIIX4_SMB_IDX, 2, "sb800_piix4_smb")) {
+	if (!request_muxed_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE,
+				  "sb800_piix4_smb")) {
 		dev_err(&PIIX4_dev->dev,
 			"SMB base address index region 0x%x already in use.\n",
 			SB800_PIIX4_SMB_IDX);
@@ -302,7 +304,7 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
 	outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
 	smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
 
-	release_region(SB800_PIIX4_SMB_IDX, 2);
+	release_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE);
 
 	if (!smb_en) {
 		smb_en_status = smba_en_lo & 0x10;
@@ -371,7 +373,8 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
 			piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT;
 		}
 	} else {
-		if (!request_muxed_region(SB800_PIIX4_SMB_IDX, 2,
+		if (!request_muxed_region(SB800_PIIX4_SMB_IDX,
+					  SB800_PIIX4_SMB_MAP_SIZE,
 					  "sb800_piix4_smb")) {
 			release_region(piix4_smba, SMBIOSIZE);
 			return -EBUSY;
@@ -384,7 +387,7 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
 				       SB800_PIIX4_PORT_IDX;
 		piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK;
 		piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT;
-		release_region(SB800_PIIX4_SMB_IDX, 2);
+		release_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE);
 	}
 
 	dev_info(&PIIX4_dev->dev,
@@ -682,7 +685,8 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
 	u8 port;
 	int retval;
 
-	if (!request_muxed_region(SB800_PIIX4_SMB_IDX, 2, "sb800_piix4_smb"))
+	if (!request_muxed_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE,
+				  "sb800_piix4_smb"))
 		return -EBUSY;
 
 	/* Request the SMBUS semaphore, avoid conflicts with the IMC */
@@ -758,7 +762,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
 		piix4_imc_wakeup();
 
 release:
-	release_region(SB800_PIIX4_SMB_IDX, 2);
+	release_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE);
 	return retval;
 }