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Commit 6408a833 authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
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i2c-algo-pcf: Delete broken 10-bit address support 



The 10-bit address support in i2c-algo-pcf is so heavily broken that
it can't have ever been used. Nobody ever complained, so I'll take it
that nobody needs it. Let's just delete it.

Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent bf3e2d1d

drivers/i2c/algos/i2c-algo-pcf.c

+13 −72
Original line number Diff line number Diff line
@@ -203,35 +203,6 @@ static int pcf_init_8584 (struct i2c_algo_pcf_data *adap) 
/* ----- Utility functions

 */



static inline int try_address(struct i2c_algo_pcf_data *adap,

		       unsigned char addr, int retries)

{

	int i, status, ret = -1;

	int wfp;

	for (i=0;i<retries;i++) {

		i2c_outb(adap, addr);

		i2c_start(adap);

		status = get_pcf(adap, 1);

		if ((wfp = wait_for_pin(adap, &status)) >= 0) {

			if ((status & I2C_PCF_LRB) == 0) { 

				i2c_stop(adap);

				break;	/* success! */

			}

		}

		if (wfp == -EINTR) {

			/* arbitration lost */

			udelay(adap->udelay);

			return -EINTR;

		}

		i2c_stop(adap);

		udelay(adap->udelay);

	}

	DEB2(if (i) printk(KERN_DEBUG "i2c-algo-pcf.o: needed %d retries for %d\n",i,

	                   addr));

	return ret;

}





static int pcf_sendbytes(struct i2c_adapter *i2c_adap, const char *buf,

                         int count, int last)

{
@@ -321,47 +292,19 @@ static int pcf_readbytes(struct i2c_adapter *i2c_adap, char *buf, 
}





static inline int pcf_doAddress(struct i2c_algo_pcf_data *adap,

                                struct i2c_msg *msg, int retries) 

static int pcf_doAddress(struct i2c_algo_pcf_data *adap,

			 struct i2c_msg *msg)

{

	unsigned short flags = msg->flags;

	unsigned char addr;

	int ret;

	if ( (flags & I2C_M_TEN)  ) { 

		/* a ten bit address */

		addr = 0xf0 | (( msg->addr >> 7) & 0x03);

		DEB2(printk(KERN_DEBUG "addr0: %d\n",addr));

		/* try extended address code...*/

		ret = try_address(adap, addr, retries);

		if (ret!=1) {

			printk(KERN_ERR "died at extended address code.\n");

			return -EREMOTEIO;

		}

		/* the remaining 8 bit address */

		i2c_outb(adap,msg->addr & 0x7f);

/* Status check comes here */

		if (ret != 1) {

			printk(KERN_ERR "died at 2nd address code.\n");

			return -EREMOTEIO;

		}

		if ( flags & I2C_M_RD ) {

			i2c_repstart(adap);

			/* okay, now switch into reading mode */

			addr |= 0x01;

			ret = try_address(adap, addr, retries);

			if (ret!=1) {

				printk(KERN_ERR "died at extended address code.\n");

				return -EREMOTEIO;

			}

		}

	} else {		/* normal 7bit address	*/

		addr = ( msg->addr << 1 );



	addr = msg->addr << 1;

	if (flags & I2C_M_RD)

		addr |= 1;

	if (flags & I2C_M_REV_DIR_ADDR)

		addr ^= 1;

	i2c_outb(adap, addr);

	}



	return 0;

}
@@ -390,7 +333,7 @@ static int pcf_xfer(struct i2c_adapter *i2c_adap, 
		     pmsg->flags & I2C_M_RD ? "read" : "write",

                     pmsg->len, pmsg->addr, i + 1, num);)

    

		ret = pcf_doAddress(adap, pmsg, i2c_adap->retries);

		ret = pcf_doAddress(adap, pmsg);



		/* Send START */

		if (i == 0) {
@@ -453,7 +396,7 @@ static int pcf_xfer(struct i2c_adapter *i2c_adap, 
static u32 pcf_func(struct i2c_adapter *adap)

{

	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | 

	       I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING; 

	       I2C_FUNC_PROTOCOL_MANGLING;

}



/* -----exported algorithm data: -------------------------------------	*/
@@ -475,9 +418,7 @@ int i2c_pcf_add_bus(struct i2c_adapter *adap) 


	/* register new adapter to i2c module... */

	adap->algo = &pcf_algo;



	adap->timeout = 100;		/* default values, should	*/

	adap->retries = 3;		/* be replaced by defines	*/

	adap->timeout = 100;



	if ((rval = pcf_init_8584(pcf_adap)))

		return rval;