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Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 

* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  i2c: Functions for byte-swapped smbus_write/read_word_data
  i2c-algo-pca: Return standard fault codes
  i2c-algo-bit: Return standard fault codes
  i2c-algo-bit: Be verbose on bus testing failure
  i2c-algo-bit: Let user test buses without failing
  i2c/scx200_acb: Fix section mismatch warning in scx200_pci_drv
  i2c: I2C_ELEKTOR should depend on HAS_IOPORT
This commit is contained in:
Linus Torvalds 2011-10-30 15:54:59 -07:00
parent 0cfdc72439 06a67848c6
commit 839d881074
6 changed files with 46 additions and 17 deletions
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8
Documentation/i2c/smbus-protocol
View File

@ -88,6 +88,10 @@ byte. But this time, the data is a complete word (16 bits).
S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
Note the convenience function i2c_smbus_read_word_swapped is
available for reads where the two data bytes are the other way
around (not SMBus compliant, but very popular.)
SMBus Write Byte: i2c_smbus_write_byte_data()
==============================================
@ -108,6 +112,10 @@ specified through the Comm byte.
S Addr Wr [A] Comm [A] DataLow [A] DataHigh [A] P
Note the convenience function i2c_smbus_write_word_swapped is
available for writes where the two data bytes are the other way
around (not SMBus compliant, but very popular.)
SMBus Process Call: i2c_smbus_process_call()
=============================================

24
drivers/i2c/algos/i2c-algo-bit.c
View File

@ -47,8 +47,8 @@
/* ----- global variables --------------------------------------------- */
static int bit_test; /* see if the line-setting functions work */
module_param(bit_test, bool, 0);
MODULE_PARM_DESC(bit_test, "Test the lines of the bus to see if it is stuck");
module_param(bit_test, int, S_IRUGO);
MODULE_PARM_DESC(bit_test, "lines testing - 0 off; 1 report; 2 fail if stuck");
#ifdef DEBUG
static int i2c_debug = 1;
@ -250,7 +250,9 @@ static int test_bus(struct i2c_adapter *i2c_adap)
sda = getsda(adap);
scl = (adap->getscl == NULL) ? 1 : getscl(adap);
if (!scl || !sda) {
printk(KERN_WARNING "%s: bus seems to be busy\n", name);
printk(KERN_WARNING
"%s: bus seems to be busy (scl=%d, sda=%d)\n",
name, scl, sda);
goto bailout;
}
@ -441,7 +443,7 @@ static int readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
acknak(i2c_adap, 0);
dev_err(&i2c_adap->dev, "readbytes: invalid "
"block length (%d)\n", inval);
return -EREMOTEIO;
return -EPROTO;
}
/* The original count value accounts for the extra
bytes, that is, either 1 for a regular transaction,
@ -470,7 +472,7 @@ static int readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
* reads, writes as well as 10bit-addresses.
* 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
* -x an error occurred (like: -ENXIO if the device did not answer, or
* -ETIMEDOUT, for example if the lines are stuck...)
*/
static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
@ -493,14 +495,14 @@ static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
if ((ret != 1) && !nak_ok) {
dev_err(&i2c_adap->dev,
"died at extended address code\n");
return -EREMOTEIO;
return -ENXIO;
}
/* the remaining 8 bit address */
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;
return -ENXIO;
}
if (flags & I2C_M_RD) {
bit_dbg(3, &i2c_adap->dev, "emitting repeated "
@ -512,7 +514,7 @@ static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
if ((ret != 1) && !nak_ok) {
dev_err(&i2c_adap->dev,
"died at repeated address code\n");
return -EREMOTEIO;
return -EIO;
}
}
} else { /* normal 7bit address */
@ -570,7 +572,7 @@ static int bit_xfer(struct i2c_adapter *i2c_adap,
ret, ret == 1 ? "" : "s");
if (ret < pmsg->len) {
if (ret >= 0)
ret = -EREMOTEIO;
ret = -EIO;
goto bailout;
}
} else {
@ -581,7 +583,7 @@ static int bit_xfer(struct i2c_adapter *i2c_adap,
ret, ret == 1 ? "" : "s");
if (ret < pmsg->len) {
if (ret >= 0)
ret = -EREMOTEIO;
ret = -EIO;
goto bailout;
}
}
@ -624,7 +626,7 @@ static int __i2c_bit_add_bus(struct i2c_adapter *adap,
if (bit_test) {
ret = test_bus(adap);
if (ret < 0)
if (bit_test >= 2 && ret < 0)
return -ENODEV;
}

6
drivers/i2c/algos/i2c-algo-pca.c
View File

@ -196,7 +196,7 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
} else {
dev_dbg(&i2c_adap->dev, "bus is not idle. status is "
"%#04x\n", state);
return -EAGAIN;
return -EBUSY;
}
}
@ -224,7 +224,7 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
}
curmsg = 0;
ret = -EREMOTEIO;
ret = -EIO;
while (curmsg < num) {
state = pca_status(adap);
@ -259,6 +259,7 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
case 0x20: /* SLA+W has been transmitted; NOT ACK has been received */
DEB2("NOT ACK received after SLA+W\n");
pca_stop(adap);
ret = -ENXIO;
goto out;
case 0x40: /* SLA+R has been transmitted; ACK has been received */
@ -283,6 +284,7 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
case 0x48: /* SLA+R has been transmitted; NOT ACK has been received */
DEB2("NOT ACK received after SLA+R\n");
pca_stop(adap);
ret = -ENXIO;
goto out;
case 0x30: /* Data byte in I2CDAT has been transmitted; NOT ACK has been received */

2
drivers/i2c/busses/Kconfig
View File

@ -789,7 +789,7 @@ config I2C_ACORN
config I2C_ELEKTOR
tristate "Elektor ISA card"
depends on ISA && BROKEN_ON_SMP
depends on ISA && HAS_IOPORT && BROKEN_ON_SMP
select I2C_ALGOPCF
help
This supports the PCF8584 ISA bus I2C adapter. Say Y if you own

6
drivers/i2c/busses/scx200_acb.c
View File

@ -550,7 +550,7 @@ static int __devexit scx200_remove(struct platform_device *pdev)
return 0;
}
static struct platform_driver scx200_pci_drv = {
static struct platform_driver scx200_pci_driver = {
.driver = {
.name = "cs5535-smb",
.owner = THIS_MODULE,
@ -593,14 +593,14 @@ static int __init scx200_acb_init(void)
return 0;
/* No ISA devices; register the platform driver for PCI-based devices */
return platform_driver_register(&scx200_pci_drv);
return platform_driver_register(&scx200_pci_driver);
}
static void __exit scx200_acb_cleanup(void)
{
struct scx200_acb_iface *iface;
platform_driver_unregister(&scx200_pci_drv);
platform_driver_unregister(&scx200_pci_driver);
mutex_lock(&scx200_acb_list_mutex);
while ((iface = scx200_acb_list) != NULL) {

17
include/linux/i2c.h
View File

@ -34,6 +34,7 @@
#include <linux/sched.h> /* for completion */
#include <linux/mutex.h>
#include <linux/of.h> /* for struct device_node */
#include <linux/swab.h> /* for swab16 */
extern struct bus_type i2c_bus_type;
extern struct device_type i2c_adapter_type;
@ -88,6 +89,22 @@ extern s32 i2c_smbus_read_word_data(const struct i2c_client *client,
u8 command);
extern s32 i2c_smbus_write_word_data(const struct i2c_client *client,
u8 command, u16 value);
static inline s32
i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command)
{
s32 value = i2c_smbus_read_word_data(client, command);
return (value < 0) ? value : swab16(value);
}
static inline s32
i2c_smbus_write_word_swapped(const struct i2c_client *client,
u8 command, u16 value)
{
return i2c_smbus_write_word_data(client, command, swab16(value));
}
/* Returns the number of read bytes */
extern s32 i2c_smbus_read_block_data(const struct i2c_client *client,
u8 command, u8 *values);