[PATCH v2 05/10] i2c: i801: add i801_simple_transaction(), complementing i801_block_transaction()

Heiner Kallweit
2022-12-19T18:23:08Z

This patch factors out non-block pre/post processing to a new function
i801_simple_transaction(), complementing existing function
i801_block_transaction(). This makes i801_access() better readable.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
v2:
- rename new function to i801_simple_transaction
- code style fixes
---
drivers/i2c/busses/i2c-i801.c | 92 +++++++++++++++++++++--------------
1 file changed, 55 insertions(+), 37 deletions(-)

diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 882cf5135..d934d410b 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -732,6 +732,59 @@ static void i801_set_hstadd(struct i801_priv *priv, u8 addr, char read_write)
outb_p((addr << 1) | (read_write & 0x01), SMBHSTADD(priv));
}

+/* Single value transaction function */
+static int i801_simple_transaction(struct i801_priv *priv, union i2c_smbus_data *data,
+ char read_write, int command)
+{
+ int xact, ret;
+
+ switch (command) {
+ case I2C_SMBUS_QUICK:
+ xact = I801_QUICK;
+ break;
+ case I2C_SMBUS_BYTE:
+ xact = I801_BYTE;
+ break;
+ case I2C_SMBUS_BYTE_DATA:
+ if (read_write == I2C_SMBUS_WRITE)
+ outb_p(data->byte, SMBHSTDAT0(priv));
+ xact = I801_BYTE_DATA;
+ break;
+ case I2C_SMBUS_WORD_DATA:
+ if (read_write == I2C_SMBUS_WRITE) {
+ outb_p(data->word & 0xff, SMBHSTDAT0(priv));
+ outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
+ }
+ xact = I801_WORD_DATA;
+ break;
+ case I2C_SMBUS_PROC_CALL:
+ outb_p(data->word & 0xff, SMBHSTDAT0(priv));
+ outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
+ xact = I801_PROC_CALL;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ ret = i801_transaction(priv, xact);
+ if (ret || read_write == I2C_SMBUS_WRITE)
+ return ret;
+
+ switch (command) {
+ case I2C_SMBUS_BYTE:
+ case I2C_SMBUS_BYTE_DATA:
+ data->byte = inb_p(SMBHSTDAT0(priv));
+ break;
+ case I2C_SMBUS_WORD_DATA:
+ case I2C_SMBUS_PROC_CALL:
+ data->word = inb_p(SMBHSTDAT0(priv)) +
+ (inb_p(SMBHSTDAT1(priv)) << 8);
+ break;
+ }
+
+ return 0;
+}
+
/* Block transaction function */
static int i801_block_transaction(struct i801_priv *priv, union i2c_smbus_data *data,
char read_write, int command)
@@ -783,9 +836,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
unsigned short flags, char read_write, u8 command,
int size, union i2c_smbus_data *data)
{
- int hwpec;
- int block = 0;
- int ret, xact;
+ int hwpec, ret, block = 0;
struct i801_priv *priv = i2c_get_adapdata(adap);

mutex_lock(&priv->acpi_lock);
@@ -803,36 +854,23 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
switch (size) {
case I2C_SMBUS_QUICK:
i801_set_hstadd(priv, addr, read_write);
- xact = I801_QUICK;
break;
case I2C_SMBUS_BYTE:
i801_set_hstadd(priv, addr, read_write);
if (read_write == I2C_SMBUS_WRITE)
outb_p(command, SMBHSTCMD(priv));
- xact = I801_BYTE;
break;
case I2C_SMBUS_BYTE_DATA:
i801_set_hstadd(priv, addr, read_write);
outb_p(command, SMBHSTCMD(priv));
- if (read_write == I2C_SMBUS_WRITE)
- outb_p(data->byte, SMBHSTDAT0(priv));
- xact = I801_BYTE_DATA;
break;
case I2C_SMBUS_WORD_DATA:
i801_set_hstadd(priv, addr, read_write);
outb_p(command, SMBHSTCMD(priv));
- if (read_write == I2C_SMBUS_WRITE) {
- outb_p(data->word & 0xff, SMBHSTDAT0(priv));
- outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
- }
- xact = I801_WORD_DATA;
break;
case I2C_SMBUS_PROC_CALL:
i801_set_hstadd(priv, addr, I2C_SMBUS_WRITE);
outb_p(command, SMBHSTCMD(priv));
- outb_p(data->word & 0xff, SMBHSTDAT0(priv));
- outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
- xact = I801_PROC_CALL;
read_write = I2C_SMBUS_READ;
break;
case I2C_SMBUS_BLOCK_DATA:
@@ -880,7 +918,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
if (block)
ret = i801_block_transaction(priv, data, read_write, size);
else
- ret = i801_transaction(priv, xact);
+ ret = i801_simple_transaction(priv, data, read_write, size);

/* Some BIOSes don't like it when PEC is enabled at reboot or resume
time, so we forcibly disable it after every transaction. Turn off
@@ -888,26 +926,6 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
if (hwpec || block)
outb_p(inb_p(SMBAUXCTL(priv)) &
~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
-
- if (block)
- goto out;
- if (ret)
- goto out;
- if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK))
- goto out;
-
- switch (xact) {
- case I801_BYTE: /* Result put in SMBHSTDAT0 */
- case I801_BYTE_DATA:
- data->byte = inb_p(SMBHSTDAT0(priv));
- break;
- case I801_WORD_DATA:
- case I801_PROC_CALL:
- data->word = inb_p(SMBHSTDAT0(priv)) +
- (inb_p(SMBHSTDAT1(priv)) << 8);
- break;
- }
-
out:
/*
* Unlock the SMBus device for use by BIOS/ACPI,
--
2.39.0