linux-kernel - [PATCH v3 3/9] i2c: piix4: Move port I/O region request/release code into functions

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Date:   Wed, 19 Jan 2022 17:06:20 -0600
From:   Terry Bowman <terry.bowman@....com>
To:     <terry.bowman@....com>, <linux@...ck-us.net>,
        <linux-watchdog@...r.kernel.org>, <jdelvare@...e.com>,
        <linux-i2c@...r.kernel.org>, <wsa@...nel.org>,
        <andy.shevchenko@...il.com>, <rafael.j.wysocki@...el.com>
CC:     <linux-kernel@...r.kernel.org>, <wim@...ux-watchdog.org>,
        <rrichter@....com>, <thomas.lendacky@....com>,
        <sudheesh.mavila@....com>, <Nehal-bakulchandra.Shah@....com>,
        <Basavaraj.Natikar@....com>, <Shyam-sundar.S-k@....com>,
        <Mario.Limonciello@....com>
Subject: [PATCH v3 3/9] i2c: piix4: Move port I/O region request/release code into functions

Move duplicated region request and release code into a function. Move is
in preparation for following MMIO changes.

Signed-off-by: Terry Bowman <terry.bowman@....com>
---
 drivers/i2c/busses/i2c-piix4.c | 43 +++++++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 14 deletions(-)

diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index b88d990b013f..14324e03fe24 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -165,6 +165,26 @@ struct i2c_piix4_adapdata {
 	u8 port;		/* Port number, shifted */
 };
 
+static int piix4_sb800_region_setup(struct device *dev)
+{
+	if (!request_muxed_region(SB800_PIIX4_SMB_IDX,
+				  SB800_PIIX4_SMB_MAP_SIZE,
+				  "sb800_piix4_smb")) {
+		dev_err(dev,
+			"SMB base address index region 0x%x already in use.\n",
+			SB800_PIIX4_SMB_IDX);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static void piix4_sb800_region_release(struct device *dev)
+{
+	release_region(SB800_PIIX4_SMB_IDX,
+		       SB800_PIIX4_SMB_MAP_SIZE);
+}
+
 static int piix4_setup(struct pci_dev *PIIX4_dev,
 		       const struct pci_device_id *id)
 {
@@ -270,6 +290,7 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
 	unsigned short piix4_smba;
 	u8 smba_en_lo, smba_en_hi, smb_en, smb_en_status, port_sel;
 	u8 i2ccfg, i2ccfg_offset = 0x10;
+	int retval;
 
 	/* SB800 and later SMBus does not support forcing address */
 	if (force || force_addr) {
@@ -291,21 +312,16 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
 	else
 		smb_en = (aux) ? 0x28 : 0x2c;
 
-	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);
-		return -EBUSY;
-	}
+	retval = piix4_sb800_region_setup(&PIIX4_dev->dev);
+	if (retval)
+		return retval;
 
 	outb_p(smb_en, SB800_PIIX4_SMB_IDX);
 	smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
 	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, SB800_PIIX4_SMB_MAP_SIZE);
+	piix4_sb800_region_release(&PIIX4_dev->dev);
 
 	if (!smb_en) {
 		smb_en_status = smba_en_lo & 0x10;
@@ -686,10 +702,9 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
 	u8 port;
 	int retval;
 
-	if (!request_muxed_region(SB800_PIIX4_SMB_IDX,
-				  SB800_PIIX4_SMB_MAP_SIZE,
-				  "sb800_piix4_smb"))
-		return -EBUSY;
+	retval = piix4_sb800_region_setup(&adap->dev);
+	if (retval)
+		return retval;
 
 	/* Request the SMBUS semaphore, avoid conflicts with the IMC */
 	smbslvcnt  = inb_p(SMBSLVCNT);
@@ -764,7 +779,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
 		piix4_imc_wakeup();
 
 release:
-	release_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE);
+	piix4_sb800_region_release(&adap->dev);
 	return retval;
 }
 
-- 
2.30.2