Commit d47726c5 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Jean Delvare
Browse files

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: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 68a7602f

drivers/i2c/i2c-core.c

+1 −1
Original line number Diff line number Diff line
@@ -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);

drivers/staging/media/go7007/wis-i2c.h

+0 −5
Original line number Diff line number Diff line
@@ -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 {

include/linux/i2c.h

+3 −0
Original line number Diff line number Diff line
@@ -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 */

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