[PATCH RFC v3 08/14] i2c: uapi: add I2C_XFER_V2 ioctl - detailed fault reporting

[Dmitry Guzman]

For user-space access to I2C multi-message transfer with detailed
reporting functionality, add I2C_XFER_V2 ioctl and corresponding
struct i2c_rdwr_v2_ioctl_data.

The structure consists of struct i2c_rdwr_ioctl_data that used in the
same way as in I2C_XFER, and struct i2c_transfer_report that the
detailed transfer report is put in.

Signed-off-by: Dmitry Guzman <Dmitry.Guzman@xxxxxxxxxxxx>
---
 include/uapi/linux/i2c-dev.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/uapi/linux/i2c-dev.h b/include/uapi/linux/i2c-dev.h
index 1c4cec4ddd84..5097568a3149 100644
--- a/include/uapi/linux/i2c-dev.h
+++ b/include/uapi/linux/i2c-dev.h
@@ -11,11 +11,13 @@
 
 #include <linux/types.h>
 #include <linux/compiler.h>
+#include <linux/i2c.h>
 
 /* /dev/i2c-X ioctl commands.  The ioctl's parameter is always an
  * unsigned long, except for:
  *	- I2C_FUNCS, takes pointer to an unsigned long
  *	- I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
+ *	- I2C_RDWR_V2, takes pointer to struct i2c_rdwr_v2_ioctl_data
  *	- I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
  */
 #define I2C_RETRIES	0x0701	/* number of times a device address should
@@ -33,6 +35,7 @@
 #define I2C_FUNCS	0x0705	/* Get the adapter functionality mask */
 
 #define I2C_RDWR	0x0707	/* Combined R/W transfer (one STOP only) */
+#define I2C_RDWR_V2	0x0709  /* I2C_RDWR with detailed fault reporting */
 
 #define I2C_PEC		0x0708	/* != 0 to use PEC with SMBus */
 #define I2C_SMBUS	0x0720	/* SMBus transfer */
@@ -52,6 +55,12 @@ struct i2c_rdwr_ioctl_data {
 	__u32 nmsgs;			/* number of i2c_msgs */
 };
 
+/* This is the structure as used in the I2C_RDWR_V2 ioctl call */
+struct i2c_rdwr_v2_ioctl_data {
+	struct i2c_rdwr_ioctl_data rdwr_data;
+	struct i2c_transfer_report report;
+};
+
 #define  I2C_RDWR_IOCTL_MAX_MSGS	42
 /* Originally defined with a typo, keep it for compatibility */
 #define  I2C_RDRW_IOCTL_MAX_MSGS	I2C_RDWR_IOCTL_MAX_MSGS

-- 
2.43.0