[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 (file)
--- a/drivers/i2c/busses/scx200_acb.c
+++ b/drivers/i2c/busses/scx200_acb.c
@@ -124,8 +124,17 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
                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 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
 
        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 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
        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 @@ static void scx200_acb_poll(struct scx200_acb_iface *iface)
                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 @@ static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter,
                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 @@ static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter,
 
        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 @@ static int  __init scx200_acb_create(int base, int index)
 {
        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 @@ static int  __init scx200_acb_create(int base, int index)
                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 @@ static int  __init scx200_acb_create(int base, int index)
        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 @@ static int  __init scx200_acb_create(int base, int index)
 
        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;
 }