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i2c: Add SCCB support 

SCCB is a serial communication bus developed by Omnivision. Its 2-wire
mode is very similar to SMBus byte data transactions, but requires the
controller to ignore the ACK bit and to insert a stop condition after
each message.

Add a device SCCB flag and a message stop flag to be passed to
controller drivers.

[JD: Kill rogue definition in go7007 driver.]

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Laurent Pinchart 2012-07-24 14:13:59 +02:00 committed by Jean Delvare
parent 68a7602f09
commit d47726c521
3 changed files with 4 additions and 6 deletions
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2
drivers/i2c/i2c-core.c
View File

@ -2122,7 +2122,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
int try;
s32 res;
flags &= I2C_M_TEN | I2C_CLIENT_PEC;
flags &= I2C_M_TEN | I2C_CLIENT_PEC | I2C_CLIENT_SCCB;
if (adapter->algo->smbus_xfer) {
i2c_lock_adapter(adapter);

5
drivers/staging/media/go7007/wis-i2c.h
View File

@ -25,11 +25,6 @@
#define I2C_DRIVERID_WIS_TW2804 0xf0f6
#define I2C_DRIVERID_S2250 0xf0f7
/* Flag to indicate that the client needs to be accessed with SCCB semantics */
/* We re-use the I2C_M_TEN value so the flag passes through the masks in the
* core I2C code. Major kludge, but the I2C layer ain't exactly flexible. */
#define I2C_CLIENT_SCCB 0x10
/* Definitions for new video decoder commands */
struct video_decoder_resolution {

3
include/linux/i2c.h
View File

@ -425,6 +425,8 @@ void i2c_unlock_adapter(struct i2c_adapter *);
#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
/* Must equal I2C_M_TEN below */
#define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */
#define I2C_CLIENT_SCCB 0x9000 /* Use Omnivision SCCB protocol */
/* Must match I2C_M_STOP|IGNORE_NAK */
/* i2c adapter classes (bitmask) */
#define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */
@ -541,6 +543,7 @@ struct i2c_msg {
__u16 flags;
#define I2C_M_TEN 0x0010 /* this is a ten bit chip address */
#define I2C_M_RD 0x0001 /* read data, from slave to master */
#define I2C_M_STOP 0x8000 /* if I2C_FUNC_PROTOCOL_MANGLING */
#define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_NOSTART */
#define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */
#define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */