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Subject[PATCH v2 06/10] i2c-i801: Pass around a boolean read/write variable
Date
From: Corey Minyard <cminyard@mvista.com>

The code was passing around read_write, which required comparison
with a constant, but was effectively a bool. Pass around an
is_read bool instead. This also makes it consistent with the
priv->is_read used for interrupt handling.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
---
drivers/i2c/busses/i2c-i801.c | 51 ++++++++++++++++++++-----------------------
1 file changed, 24 insertions(+), 27 deletions(-)

diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 56db310..ae1e60a 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -432,7 +432,7 @@ static int i801_transaction(struct i801_priv *priv, int xact)

static int i801_block_transaction_by_block(struct i801_priv *priv,
union i2c_smbus_data *data,
- char read_write, int hwpec)
+ bool is_read, int hwpec)
{
int i, len;
int status;
@@ -440,7 +440,7 @@ static int i801_block_transaction_by_block(struct i801_priv *priv,
inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */

/* Use 32-byte buffer to process this transaction */
- if (read_write == I2C_SMBUS_WRITE) {
+ if (!is_read) {
len = data->block[0];
outb_p(len, SMBHSTDAT0(priv));
for (i = 0; i < len; i++)
@@ -452,7 +452,7 @@ static int i801_block_transaction_by_block(struct i801_priv *priv,
if (status < 0 || status & STATUS_ERROR_FLAGS)
return status;

- if (read_write == I2C_SMBUS_READ) {
+ if (is_read) {
len = priv->len = inb_p(SMBHSTDAT0(priv));
if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
return -EPROTO;
@@ -555,7 +555,7 @@ static irqreturn_t i801_isr(int irq, void *dev_id)
*/
static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
union i2c_smbus_data *data,
- char read_write, int command)
+ bool is_read, int command)
{
int i, len;
int smbcmd;
@@ -565,20 +565,19 @@ static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,

len = data->block[0];

- if (read_write == I2C_SMBUS_WRITE) {
+ if (!is_read) {
outb_p(len, SMBHSTDAT0(priv));
outb_p(data->block[1], SMBBLKDAT(priv));
}

- if (command == I2C_SMBUS_I2C_BLOCK_DATA &&
- read_write == I2C_SMBUS_READ)
+ if (command == I2C_SMBUS_I2C_BLOCK_DATA && is_read)
smbcmd = I801_I2C_BLOCK_DATA;
else
smbcmd = I801_BLOCK_DATA;

if (priv->features & FEATURE_IRQ) {
- priv->is_read = (read_write == I2C_SMBUS_READ);
- if (len == 1 && priv->is_read)
+ priv->is_read = is_read;
+ if (len == 1 && is_read)
smbcmd |= SMBHSTCNT_LAST_BYTE;
priv->cmd = smbcmd | SMBHSTCNT_INTREN;
priv->len = len;
@@ -599,7 +598,7 @@ static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
}

for (i = 1; i <= len; i++) {
- if (i == len && read_write == I2C_SMBUS_READ)
+ if (i == len && is_read)
smbcmd |= SMBHSTCNT_LAST_BYTE;
outb_p(smbcmd, SMBHSTCNT(priv));

@@ -611,7 +610,7 @@ static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
if (status)
return status;

- if (i == 1 && read_write == I2C_SMBUS_READ
+ if (i == 1 && is_read
&& command != I2C_SMBUS_I2C_BLOCK_DATA) {
priv->len = inb_p(SMBHSTDAT0(priv));
if (priv->len < 1 || priv->len > I2C_SMBUS_BLOCK_MAX)
@@ -620,9 +619,9 @@ static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
}

/* Retrieve/store value in SMBBLKDAT */
- if (read_write == I2C_SMBUS_READ)
+ if (is_read)
data->block[i] = inb_p(SMBBLKDAT(priv));
- if (read_write == I2C_SMBUS_WRITE && i+1 <= len)
+ else if (i+1 <= len)
outb_p(data->block[i+1], SMBBLKDAT(priv));

/* signals SMBBLKDAT ready */
@@ -642,7 +641,7 @@ static int i801_set_block_buffer_mode(struct i801_priv *priv)

/* Block transaction function */
static int i801_block_transaction(struct i801_priv *priv, unsigned short flags,
- union i2c_smbus_data *data, char read_write,
+ union i2c_smbus_data *data, bool is_read,
int command)
{
int result = 0;
@@ -658,8 +657,7 @@ static int i801_block_transaction(struct i801_priv *priv, unsigned short flags,
outb_p(inb_p(SMBAUXCTL(priv)) & (~SMBAUXCTL_CRC),
SMBAUXCTL(priv));

- if (read_write == I2C_SMBUS_WRITE
- || command == I2C_SMBUS_I2C_BLOCK_DATA) {
+ if (!is_read || command == I2C_SMBUS_I2C_BLOCK_DATA) {
if (data->block[0] < 1)
data->block[0] = 1;
if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
@@ -674,12 +672,11 @@ static int i801_block_transaction(struct i801_priv *priv, unsigned short flags,
if ((priv->features & FEATURE_BLOCK_BUFFER)
&& command != I2C_SMBUS_I2C_BLOCK_DATA
&& i801_set_block_buffer_mode(priv) == 0)
- result = i801_block_transaction_by_block(priv, data,
- read_write, hwpec);
+ result = i801_block_transaction_by_block(priv, data, is_read,
+ hwpec);
else
result = i801_block_transaction_byte_by_byte(priv, data,
- read_write,
- command);
+ is_read, command);

/*
* Some BIOSes don't like it when PEC is enabled at reboot or
@@ -702,6 +699,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
int block = 0;
int ret = 0, xact = 0;
int hostc = -1;
+ bool is_read = (read_write == I2C_SMBUS_READ);
struct i801_priv *priv = i2c_get_adapdata(adap);

pm_runtime_get_sync(&priv->pci_dev->dev);
@@ -715,7 +713,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
case I2C_SMBUS_BYTE:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
- if (read_write == I2C_SMBUS_WRITE)
+ if (!is_read)
outb_p(command, SMBHSTCMD(priv));
xact = I801_BYTE;
break;
@@ -723,7 +721,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
outb_p(command, SMBHSTCMD(priv));
- if (read_write == I2C_SMBUS_WRITE)
+ if (!is_read)
outb_p(data->byte, SMBHSTDAT0(priv));
xact = I801_BYTE_DATA;
break;
@@ -731,7 +729,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
outb_p(command, SMBHSTCMD(priv));
- if (read_write == I2C_SMBUS_WRITE) {
+ if (!is_read) {
outb_p(data->word & 0xff, SMBHSTDAT0(priv));
outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
}
@@ -747,7 +745,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
/* NB: page 240 of ICH5 datasheet shows that the R/#W
* bit should be cleared here, even when reading */
outb_p((addr & 0x7f) << 1, SMBHSTADD(priv));
- if (read_write == I2C_SMBUS_WRITE) {
+ if (!is_read) {
unsigned char thostc;

outb_p(command, SMBHSTCMD(priv));
@@ -779,8 +777,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
goto out;

if (block)
- ret = i801_block_transaction(priv, flags, data, read_write,
- size);
+ ret = i801_block_transaction(priv, flags, data, is_read, size);
else
ret = i801_transaction(priv, xact);

@@ -797,7 +794,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
goto out;
if (ret)
goto out;
- if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK))
+ if (!is_read || (xact == I801_QUICK))
goto out;

switch (xact & 0x7f) {
--
2.7.4
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