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[v2,6/7] i2c: add 'transferred' field to struct i2c_msg

Message ID 1351167915-15079-7-git-send-email-balbi@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Felipe Balbi Oct. 25, 2012, 12:25 p.m. UTC 
From: Shubhrajyoti D <shubhrajyoti@ti.com>

In case of a NACK, it's wise to tell our clients
drivers about how many bytes were actually transferred.

Support this by adding an extra field to the struct
i2c_msg which gets incremented the amount of bytes
actually transferred.

Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 include/uapi/linux/i2c.h | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/include/uapi/linux/i2c.h b/include/uapi/linux/i2c.h
index 0e949cb..4b35c9b 100644
--- a/include/uapi/linux/i2c.h
+++ b/include/uapi/linux/i2c.h
@@ -77,6 +77,7 @@  struct i2c_msg {
 #define I2C_M_NO_RD_ACK		0x0800	/* if I2C_FUNC_PROTOCOL_MANGLING */
 #define I2C_M_RECV_LEN		0x0400	/* length will be first received byte */
 	__u16 len;		/* msg length				*/
+	__u16 transferred;	/* actual bytes transferred             */
 	__u8 *buf;		/* pointer to msg data			*/
 };