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[v5,3/8] i2c: piix4: Export i2c_piix4 driver functions as library

Message ID 20240913121110.1611340-4-Shyam-sundar.S-k@amd.com
State New
Headers show
Series Introduce initial AMD ASF Controller driver support | expand

Commit Message

Shyam Sundar S K Sept. 13, 2024, 12:11 p.m. UTC 
Export the following i2c_piix4 driver functions as a library so that the
AMD ASF driver can utilize these core functionalities from the i2c_piix4
driver:

- piix4_sb800_region_request(): Request access to a specific SMBus region
on the SB800 chipset.

- piix4_sb800_region_release(): Release the previously requested SMBus
region on the SB800 chipset.

- piix4_transaction(): Handle SMBus transactions between the SMBus
controller and connected devices.

- piix4_sb800_port_sel(): Select the appropriate SMBus port on the SB800
chipset.

By making these functions available as a library, enable the AMD ASF
driver to leverage the established mechanisms in the i2c_piix4 driver,
promoting code reuse and consistency across different drivers.

Note that the git diff view is presented in two separate lines in order to
suppress the checkpatch.pl "CHECKS".

Co-developed-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
---
 drivers/i2c/busses/i2c-piix4.c | 16 ++++++++++------
 drivers/i2c/busses/i2c-piix4.h |  5 +++++
 2 files changed, 15 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 2c2a466e2f85..7e0fb51ce532 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -153,8 +153,8 @@  struct i2c_piix4_adapdata {
 	struct sb800_mmio_cfg mmio_cfg;
 };
 
-static int piix4_sb800_region_request(struct device *dev,
-				      struct sb800_mmio_cfg *mmio_cfg)
+int piix4_sb800_region_request(struct device *dev,
+			       struct sb800_mmio_cfg *mmio_cfg)
 {
 	if (mmio_cfg->use_mmio) {
 		void __iomem *addr;
@@ -192,9 +192,10 @@  static int piix4_sb800_region_request(struct device *dev,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(piix4_sb800_region_request);
 
-static void piix4_sb800_region_release(struct device *dev,
-				       struct sb800_mmio_cfg *mmio_cfg)
+void piix4_sb800_region_release(struct device *dev,
+				struct sb800_mmio_cfg *mmio_cfg)
 {
 	if (mmio_cfg->use_mmio) {
 		iounmap(mmio_cfg->addr);
@@ -205,6 +206,7 @@  static void piix4_sb800_region_release(struct device *dev,
 
 	release_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE);
 }
+EXPORT_SYMBOL_GPL(piix4_sb800_region_release);
 
 static bool piix4_sb800_use_mmio(struct pci_dev *PIIX4_dev)
 {
@@ -514,7 +516,7 @@  static int piix4_setup_aux(struct pci_dev *PIIX4_dev,
 	return piix4_smba;
 }
 
-static int piix4_transaction(struct i2c_adapter *piix4_adapter, unsigned short piix4_smba)
+int piix4_transaction(struct i2c_adapter *piix4_adapter, unsigned short piix4_smba)
 {
 	int temp;
 	int result = 0;
@@ -587,6 +589,7 @@  static int piix4_transaction(struct i2c_adapter *piix4_adapter, unsigned short p
 		inb_p(SMBHSTDAT1));
 	return result;
 }
+EXPORT_SYMBOL_GPL(piix4_transaction);
 
 /* Return negative errno on error. */
 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
@@ -740,7 +743,7 @@  static void piix4_imc_wakeup(void)
 	release_region(KERNCZ_IMC_IDX, 2);
 }
 
-static int piix4_sb800_port_sel(u8 port, struct sb800_mmio_cfg *mmio_cfg)
+int piix4_sb800_port_sel(u8 port, struct sb800_mmio_cfg *mmio_cfg)
 {
 	u8 smba_en_lo, val;
 
@@ -762,6 +765,7 @@  static int piix4_sb800_port_sel(u8 port, struct sb800_mmio_cfg *mmio_cfg)
 
 	return (smba_en_lo & piix4_port_mask_sb800);
 }
+EXPORT_SYMBOL_GPL(piix4_sb800_port_sel);
 
 /*
  * Handles access to multiple SMBus ports on the SB800.
diff --git a/drivers/i2c/busses/i2c-piix4.h b/drivers/i2c/busses/i2c-piix4.h
index c4c20edacb00..9a5faac3eedd 100644
--- a/drivers/i2c/busses/i2c-piix4.h
+++ b/drivers/i2c/busses/i2c-piix4.h
@@ -37,4 +37,9 @@  struct sb800_mmio_cfg {
 	bool use_mmio;
 };
 
+int piix4_sb800_port_sel(u8 port, struct sb800_mmio_cfg *mmio_cfg);
+int piix4_transaction(struct i2c_adapter *piix4_adapter, unsigned short piix4_smba);
+int piix4_sb800_region_request(struct device *dev, struct sb800_mmio_cfg *mmio_cfg);
+void piix4_sb800_region_release(struct device *dev, struct sb800_mmio_cfg *mmio_cfg);
+
 #endif /* I2C_PIIX4_H */