i2c-algo-bit: Whitespace fixes (+ NAK/ARB comments)
authorDavid Brownell <david-b@pacbell.net>
Sun, 27 Jan 2008 17:14:46 +0000 (18:14 +0100)
committerJean Delvare <khali@hyperion.delvare>
Sun, 27 Jan 2008 17:14:46 +0000 (18:14 +0100)
Fix *LOTS* of whitespace goofs and checkpatch.pl warnings, strangely
parenthesized ternary expressions, and other CodingStyle glitches.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
drivers/i2c/algos/i2c-algo-bit.c

index a37cb6b8593cf715c957d49a400d01209ff69187..260c5d70b0b42669ed5c2ce4a3d24f40d39a8719 100644 (file)
@@ -1,7 +1,7 @@
-/* ------------------------------------------------------------------------- */
-/* i2c-algo-bit.c i2c driver algorithms for bit-shift adapters              */
-/* ------------------------------------------------------------------------- */
-/*   Copyright (C) 1995-2000 Simon G. Vogl
+/* -------------------------------------------------------------------------
+ * i2c-algo-bit.c i2c driver algorithms for bit-shift adapters
+ * -------------------------------------------------------------------------
+ *   Copyright (C) 1995-2000 Simon G. Vogl
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -15,8 +15,8 @@
 
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               */
-/* ------------------------------------------------------------------------- */
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * ------------------------------------------------------------------------- */
 
 /* With some changes from Frodo Looijaard <frodol@dds.nl>, Kyösti Mälkki
    <kmalkki@cc.hut.fi> and Jean Delvare <khali@linux-fr.org> */
@@ -60,26 +60,26 @@ MODULE_PARM_DESC(i2c_debug,
 
 /* --- setting states on the bus with the right timing: ---------------        */
 
-#define setsda(adap,val) adap->setsda(adap->data, val)
-#define setscl(adap,val) adap->setscl(adap->data, val)
-#define getsda(adap) adap->getsda(adap->data)
-#define getscl(adap) adap->getscl(adap->data)
+#define setsda(adap, val)      adap->setsda(adap->data, val)
+#define setscl(adap, val)      adap->setscl(adap->data, val)
+#define getsda(adap)           adap->getsda(adap->data)
+#define getscl(adap)           adap->getscl(adap->data)
 
 static inline void sdalo(struct i2c_algo_bit_data *adap)
 {
-       setsda(adap,0);
+       setsda(adap, 0);
        udelay((adap->udelay + 1) / 2);
 }
 
 static inline void sdahi(struct i2c_algo_bit_data *adap)
 {
-       setsda(adap,1);
+       setsda(adap, 1);
        udelay((adap->udelay + 1) / 2);
 }
 
 static inline void scllo(struct i2c_algo_bit_data *adap)
 {
-       setscl(adap,0);
+       setscl(adap, 0);
        udelay(adap->udelay / 2);
 }
 
@@ -91,22 +91,21 @@ static int sclhi(struct i2c_algo_bit_data *adap)
 {
        unsigned long start;
 
-       setscl(adap,1);
+       setscl(adap, 1);
 
        /* Not all adapters have scl sense line... */
        if (!adap->getscl)
                goto done;
 
-       start=jiffies;
-       while (! getscl(adap) ) {       
-               /* the hw knows how to read the clock line,
-                * so we wait until it actually gets high.
-                * This is safer as some chips may hold it low
-                * while they are processing data internally. 
-                */
-               if (time_after_eq(jiffies, start+adap->timeout)) {
+       start = jiffies;
+       while (!getscl(adap)) {
+               /* This hw knows how to read the clock line, so we wait
+                * until it actually gets high.  This is safer as some
+                * chips may hold it low ("clock stretching") while they
+                * are processing data internally.
+                */
+               if (time_after_eq(jiffies, start + adap->timeout))
                        return -ETIMEDOUT;
-               }
                cond_resched();
        }
 #ifdef DEBUG
@@ -118,11 +117,11 @@ static int sclhi(struct i2c_algo_bit_data *adap)
 done:
        udelay(adap->udelay);
        return 0;
-} 
+}
 
 
 /* --- other auxiliary functions --------------------------------------        */
-static void i2c_start(struct i2c_algo_bit_data *adap) 
+static void i2c_start(struct i2c_algo_bit_data *adap)
 {
        /* assert: scl, sda are high */
        setsda(adap, 0);
@@ -130,7 +129,7 @@ static void i2c_start(struct i2c_algo_bit_data *adap)
        scllo(adap);
 }
 
-static void i2c_repstart(struct i2c_algo_bit_data *adap) 
+static void i2c_repstart(struct i2c_algo_bit_data *adap)
 {
        /* assert: scl is low */
        sdahi(adap);
@@ -141,18 +140,18 @@ static void i2c_repstart(struct i2c_algo_bit_data *adap)
 }
 
 
-static void i2c_stop(struct i2c_algo_bit_data *adap) 
+static void i2c_stop(struct i2c_algo_bit_data *adap)
 {
        /* assert: scl is low */
        sdalo(adap);
-       sclhi(adap); 
+       sclhi(adap);
        setsda(adap, 1);
        udelay(adap->udelay);
 }
 
 
 
-/* send a byte without start cond., look for arbitration, 
+/* send a byte without start cond., look for arbitration,
    check ackn. from slave */
 /* returns:
  * 1 if the device acknowledged
@@ -167,27 +166,33 @@ static int i2c_outb(struct i2c_adapter *i2c_adap, unsigned char c)
        struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
 
        /* assert: scl is low */
-       for ( i=7 ; i>=0 ; i-- ) {
+       for (i = 7; i >= 0; i--) {
                sb = (c >> i) & 1;
-               setsda(adap,sb);
+               setsda(adap, sb);
                udelay((adap->udelay + 1) / 2);
-               if (sclhi(adap)<0) { /* timed out */
+               if (sclhi(adap) < 0) { /* timed out */
                        bit_dbg(1, &i2c_adap->dev, "i2c_outb: 0x%02x, "
                                "timeout at bit #%d\n", (int)c, i);
                        return -ETIMEDOUT;
-               };
-               /* do arbitration here: 
-                * if ( sb && ! getsda(adap) ) -> ouch! Get out of here.
+               }
+               /* FIXME do arbitration here:
+                * if (sb && !getsda(adap)) -> ouch! Get out of here.
+                *
+                * Report a unique code, so higher level code can retry
+                * the whole (combined) message and *NOT* issue STOP.
                 */
                scllo(adap);
        }
        sdahi(adap);
-       if (sclhi(adap)<0){ /* timeout */
+       if (sclhi(adap) < 0) { /* timeout */
                bit_dbg(1, &i2c_adap->dev, "i2c_outb: 0x%02x, "
                        "timeout at ack\n", (int)c);
                return -ETIMEDOUT;
-       };
-       /* read ack: SDA should be pulled down by slave */
+       }
+
+       /* read ack: SDA should be pulled down by slave, or it may
+        * NAK (usually to report problems with the data we wrote).
+        */
        ack = !getsda(adap);    /* ack: sda is pulled low -> success */
        bit_dbg(2, &i2c_adap->dev, "i2c_outb: 0x%02x %s\n", (int)c,
                ack ? "A" : "NA");
@@ -198,24 +203,24 @@ static int i2c_outb(struct i2c_adapter *i2c_adap, unsigned char c)
 }
 
 
-static int i2c_inb(struct i2c_adapter *i2c_adap) 
+static int i2c_inb(struct i2c_adapter *i2c_adap)
 {
        /* read byte via i2c port, without start/stop sequence  */
        /* acknowledge is sent in i2c_read.                     */
        int i;
-       unsigned char indata=0;
+       unsigned char indata = 0;
        struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
 
        /* assert: scl is low */
        sdahi(adap);
-       for (i=0;i<8;i++) {
-               if (sclhi(adap)<0) { /* timeout */
+       for (i = 0; i < 8; i++) {
+               if (sclhi(adap) < 0) { /* timeout */
                        bit_dbg(1, &i2c_adap->dev, "i2c_inb: timeout at bit "
                                "#%d\n", 7 - i);
                        return -ETIMEDOUT;
-               };
+               }
                indata *= 2;
-               if ( getsda(adap) ) 
+               if (getsda(adap))
                        indata |= 0x01;
                setscl(adap, 0);
                udelay(i == 7 ? adap->udelay / 2 : adap->udelay);
@@ -228,66 +233,67 @@ static int i2c_inb(struct i2c_adapter *i2c_adap)
  * Sanity check for the adapter hardware - check the reaction of
  * the bus lines only if it seems to be idle.
  */
-static int test_bus(struct i2c_algo_bit_data *adap, char* name) {
-       int scl,sda;
+static int test_bus(struct i2c_algo_bit_data *adap, char *name)
+{
+       int scl, sda;
 
-       if (adap->getscl==NULL)
+       if (adap->getscl == NULL)
                pr_info("%s: Testing SDA only, SCL is not readable\n", name);
 
-       sda=getsda(adap);
-       scl=(adap->getscl==NULL?1:getscl(adap));
-       if (!scl || !sda ) {
+       sda = getsda(adap);
+       scl = (adap->getscl == NULL) ? 1 : getscl(adap);
+       if (!scl || !sda) {
                printk(KERN_WARNING "%s: bus seems to be busy\n", name);
                goto bailout;
        }
 
        sdalo(adap);
-       sda=getsda(adap);
-       scl=(adap->getscl==NULL?1:getscl(adap));
-       if ( 0 != sda ) {
+       sda = getsda(adap);
+       scl = (adap->getscl == NULL) ? 1 : getscl(adap);
+       if (sda) {
                printk(KERN_WARNING "%s: SDA stuck high!\n", name);
                goto bailout;
        }
-       if ( 0 == scl ) {
+       if (!scl) {
                printk(KERN_WARNING "%s: SCL unexpected low "
                       "while pulling SDA low!\n", name);
                goto bailout;
-       }               
+       }
 
        sdahi(adap);
-       sda=getsda(adap);
-       scl=(adap->getscl==NULL?1:getscl(adap));
-       if ( 0 == sda ) {
+       sda = getsda(adap);
+       scl = (adap->getscl == NULL) ? 1 : getscl(adap);
+       if (!sda) {
                printk(KERN_WARNING "%s: SDA stuck low!\n", name);
                goto bailout;
        }
-       if ( 0 == scl ) {
+       if (!scl) {
                printk(KERN_WARNING "%s: SCL unexpected low "
                       "while pulling SDA high!\n", name);
                goto bailout;
        }
 
        scllo(adap);
-       sda=getsda(adap);
-       scl=(adap->getscl==NULL?0:getscl(adap));
-       if ( 0 != scl ) {
+       sda = getsda(adap);
+       scl = (adap->getscl == NULL) ? 0 : getscl(adap);
+       if (scl) {
                printk(KERN_WARNING "%s: SCL stuck high!\n", name);
                goto bailout;
        }
-       if ( 0 == sda ) {
+       if (!sda) {
                printk(KERN_WARNING "%s: SDA unexpected low "
                       "while pulling SCL low!\n", name);
                goto bailout;
        }
-       
+
        sclhi(adap);
-       sda=getsda(adap);
-       scl=(adap->getscl==NULL?1:getscl(adap));
-       if ( 0 == scl ) {
+       sda = getsda(adap);
+       scl = (adap->getscl == NULL) ? 1 : getscl(adap);
+       if (!scl) {
                printk(KERN_WARNING "%s: SCL stuck low!\n", name);
                goto bailout;
        }
-       if ( 0 == sda ) {
+       if (!sda) {
                printk(KERN_WARNING "%s: SDA unexpected low "
                       "while pulling SCL high!\n", name);
                goto bailout;
@@ -314,9 +320,10 @@ static int try_address(struct i2c_adapter *i2c_adap,
                       unsigned char addr, int retries)
 {
        struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
-       int i,ret = -1;
-       for (i=0;i<=retries;i++) {
-               ret = i2c_outb(i2c_adap,addr);
+       int i, ret = -1;
+
+       for (i = 0; i <= retries; i++) {
+               ret = i2c_outb(i2c_adap, addr);
                if (ret == 1 || i == retries)
                        break;
                bit_dbg(3, &i2c_adap->dev, "emitting stop condition\n");
@@ -338,14 +345,16 @@ static int sendbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
 {
        const unsigned char *temp = msg->buf;
        int count = msg->len;
-       unsigned short nak_ok = msg->flags & I2C_M_IGNORE_NAK; 
+       unsigned short nak_ok = msg->flags & I2C_M_IGNORE_NAK;
        int retval;
-       int wrcount=0;
+       int wrcount = 0;
 
        while (count > 0) {
                retval = i2c_outb(i2c_adap, *temp);
-               if ((retval>0) || (nak_ok && (retval==0)))  { /* ok or ignored NAK */
-                       count--; 
+
+               /* OK/ACK; or ignored NAK */
+               if ((retval > 0) || (nak_ok && (retval == 0))) {
+                       count--;
                        temp++;
                        wrcount++;
                } else { /* arbitration or no acknowledge */
@@ -376,14 +385,14 @@ static int acknak(struct i2c_adapter *i2c_adap, int is_ack)
 static int readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
 {
        int inval;
-       int rdcount=0;          /* counts bytes read */
+       int rdcount = 0;        /* counts bytes read */
        unsigned char *temp = msg->buf;
        int count = msg->len;
        const unsigned flags = msg->flags;
 
        while (count > 0) {
                inval = i2c_inb(i2c_adap);
-               if (inval>=0) {
+               if (inval >= 0) {
                        *temp = inval;
                        rdcount++;
                } else {   /* read timed out */
@@ -431,7 +440,7 @@ static int readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
  * returns:
  *  0 everything went okay, the chip ack'ed, or IGNORE_NAK flag was set
  * -x an error occurred (like: -EREMOTEIO if the device did not answer, or
- *     -ETIMEDOUT, for example if the lines are stuck...) 
+ *     -ETIMEDOUT, for example if the lines are stuck...)
  */
 static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
 {
@@ -443,10 +452,10 @@ static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
        int ret, retries;
 
        retries = nak_ok ? 0 : i2c_adap->retries;
-       
-       if ( (flags & I2C_M_TEN)  ) { 
+
+       if (flags & I2C_M_TEN) {
                /* a ten bit address */
-               addr = 0xf0 | (( msg->addr >> 7) & 0x03);
+               addr = 0xf0 | ((msg->addr >> 7) & 0x03);
                bit_dbg(2, &i2c_adap->dev, "addr0: %d\n", addr);
                /* try extended address code...*/
                ret = try_address(i2c_adap, addr, retries);
@@ -456,33 +465,33 @@ static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
                        return -EREMOTEIO;
                }
                /* the remaining 8 bit address */
-               ret = i2c_outb(i2c_adap,msg->addr & 0x7f);
+               ret = i2c_outb(i2c_adap, msg->addr & 0x7f);
                if ((ret != 1) && !nak_ok) {
                        /* the chip did not ack / xmission error occurred */
                        dev_err(&i2c_adap->dev, "died at 2nd address code\n");
                        return -EREMOTEIO;
                }
-               if ( flags & I2C_M_RD ) {
+               if (flags & I2C_M_RD) {
                        bit_dbg(3, &i2c_adap->dev, "emitting repeated "
                                "start condition\n");
                        i2c_repstart(adap);
                        /* okay, now switch into reading mode */
                        addr |= 0x01;
                        ret = try_address(i2c_adap, addr, retries);
-                       if ((ret!=1) && !nak_ok) {
+                       if ((ret != 1) && !nak_ok) {
                                dev_err(&i2c_adap->dev,
                                        "died at repeated address code\n");
                                return -EREMOTEIO;
                        }
                }
        } else {                /* normal 7bit address  */
-               addr = ( msg->addr << 1 );
-               if (flags & I2C_M_RD )
+               addr = msg->addr << 1;
+               if (flags & I2C_M_RD)
                        addr |= 1;
-               if (flags & I2C_M_REV_DIR_ADDR )
+               if (flags & I2C_M_REV_DIR_ADDR)
                        addr ^= 1;
                ret = try_address(i2c_adap, addr, retries);
-               if ((ret!=1) && !nak_ok)
+               if ((ret != 1) && !nak_ok)
                        return -EREMOTEIO;
        }
 
@@ -494,15 +503,14 @@ static int bit_xfer(struct i2c_adapter *i2c_adap,
 {
        struct i2c_msg *pmsg;
        struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
-       
-       int i,ret;
+       int i, ret;
        unsigned short nak_ok;
 
        bit_dbg(3, &i2c_adap->dev, "emitting start condition\n");
        i2c_start(adap);
-       for (i=0;i<num;i++) {
+       for (i = 0; i < num; i++) {
                pmsg = &msgs[i];
-               nak_ok = pmsg->flags & I2C_M_IGNORE_NAK; 
+               nak_ok = pmsg->flags & I2C_M_IGNORE_NAK;
                if (!(pmsg->flags & I2C_M_NOSTART)) {
                        if (i) {
                                bit_dbg(3, &i2c_adap->dev, "emitting "
@@ -517,7 +525,7 @@ static int bit_xfer(struct i2c_adapter *i2c_adap,
                                goto bailout;
                        }
                }
-               if (pmsg->flags & I2C_M_RD ) {
+               if (pmsg->flags & I2C_M_RD) {
                        /* read bytes into buffer*/
                        ret = readbytes(i2c_adap, pmsg);
                        if (ret >= 1)
@@ -551,7 +559,7 @@ bailout:
 
 static u32 bit_func(struct i2c_adapter *adap)
 {
-       return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | 
+       return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
               I2C_FUNC_SMBUS_READ_BLOCK_DATA |
               I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
               I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING;
@@ -565,8 +573,8 @@ static const struct i2c_algorithm i2c_bit_algo = {
        .functionality  = bit_func,
 };
 
-/* 
- * registering functions to load algorithms at runtime 
+/*
+ * registering functions to load algorithms at runtime
  */
 static int i2c_bit_prepare_bus(struct i2c_adapter *adap)
 {
@@ -574,7 +582,7 @@ static int i2c_bit_prepare_bus(struct i2c_adapter *adap)
 
        if (bit_test) {
                int ret = test_bus(bit_adap, adap->name);
-               if (ret<0)
+               if (ret < 0)
                        return -ENODEV;
        }