[PATCH] i2c: scx200_acb refactor/simplify code
scx200_acb: refactor/simplify code (no functional changes)
Signed-off-by: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/i2c/busses/scx200_acb.c b/drivers/i2c/busses/scx200_acb.c
index bfa243d..517a050 100644
--- a/drivers/i2c/busses/scx200_acb.c
+++ b/drivers/i2c/busses/scx200_acb.c
@@ -124,8 +124,17 @@
errmsg = "not master";
goto error;
}
- if (status & ACBST_NEGACK)
- goto negack;
+ if (status & ACBST_NEGACK) {
+ dev_dbg(&iface->adapter.dev, "negative ack in state %s\n",
+ scx200_acb_state_name[iface->state]);
+
+ iface->state = state_idle;
+ iface->result = -ENXIO;
+
+ outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
+ outb(ACBST_STASTR | ACBST_NEGACK, ACBST);
+ return;
+ }
switch (iface->state) {
case state_idle:
@@ -202,17 +211,6 @@
return;
- negack:
- dev_dbg(&iface->adapter.dev, "negative ack in state %s\n",
- scx200_acb_state_name[iface->state]);
-
- iface->state = state_idle;
- iface->result = -ENXIO;
-
- outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
- outb(ACBST_STASTR | ACBST_NEGACK, ACBST);
- return;
-
error:
dev_err(&iface->adapter.dev, "%s in state %s\n", errmsg,
scx200_acb_state_name[iface->state]);
@@ -222,20 +220,10 @@
iface->needs_reset = 1;
}
-static void scx200_acb_timeout(struct scx200_acb_iface *iface)
-{
- dev_err(&iface->adapter.dev, "timeout in state %s\n",
- scx200_acb_state_name[iface->state]);
-
- iface->state = state_idle;
- iface->result = -EIO;
- iface->needs_reset = 1;
-}
-
#ifdef POLLED_MODE
static void scx200_acb_poll(struct scx200_acb_iface *iface)
{
- u8 status = 0;
+ u8 status;
unsigned long timeout;
timeout = jiffies + POLL_TIMEOUT;
@@ -248,7 +236,12 @@
msleep(10);
}
- scx200_acb_timeout(iface);
+ dev_err(&iface->adapter.dev, "timeout in state %s\n",
+ scx200_acb_state_name[iface->state]);
+
+ iface->state = state_idle;
+ iface->result = -EIO;
+ iface->needs_reset = 1;
}
#endif /* POLLED_MODE */
@@ -291,13 +284,8 @@
break;
case I2C_SMBUS_BYTE:
- if (rw == I2C_SMBUS_READ) {
- len = 1;
- buffer = &data->byte;
- } else {
- len = 1;
- buffer = &command;
- }
+ len = 1;
+ buffer = rw ? &data->byte : &command;
break;
case I2C_SMBUS_BYTE_DATA:
@@ -331,9 +319,7 @@
down(&iface->sem);
- iface->address_byte = address<<1;
- if (rw == I2C_SMBUS_READ)
- iface->address_byte |= 1;
+ iface->address_byte = (address << 1) | rw;
iface->command = command;
iface->ptr = buffer;
iface->len = len;
@@ -433,7 +419,7 @@
{
struct scx200_acb_iface *iface;
struct i2c_adapter *adapter;
- int rc = 0;
+ int rc;
char description[64];
iface = kzalloc(sizeof(*iface), GFP_KERNEL);
@@ -459,14 +445,14 @@
printk(KERN_ERR NAME ": can't allocate io 0x%x-0x%x\n",
base, base + 8-1);
rc = -EBUSY;
- goto errout;
+ goto errout_free;
}
iface->base = base;
rc = scx200_acb_probe(iface);
if (rc) {
printk(KERN_WARNING NAME ": probe failed\n");
- goto errout;
+ goto errout_release;
}
scx200_acb_reset(iface);
@@ -474,7 +460,7 @@
if (i2c_add_adapter(adapter) < 0) {
printk(KERN_ERR NAME ": failed to register\n");
rc = -ENODEV;
- goto errout;
+ goto errout_release;
}
lock_kernel();
@@ -484,12 +470,11 @@
return 0;
+ errout_release:
+ release_region(iface->base, 8);
+ errout_free:
+ kfree(iface);
errout:
- if (iface) {
- if (iface->base)
- release_region(iface->base, 8);
- kfree(iface);
- }
return rc;
}