linux-kernel - [PATCH 1/13] include/linux/i2c.h: introduce macros for i2c

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Date:	Sun,  7 Oct 2012 17:38:31 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	khali@...ux-fr.org, ben-linux@...ff.org, w.sang@...gutronix.de,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	kernel-janitors@...r.kernel.org, rmallon@...il.com,
	shubhrajyoti@...com
Subject: [PATCH 1/13] include/linux/i2c.h: introduce macros for i2c_msg initialization

From: Julia Lawall <Julia.Lawall@...6.fr>

This patch introduces some macros for describing how an i2c_msg is being
initialized.  There are three macros: I2C_MSG_READ, for a read message,
I2C_MSG_WRITE, for a write message, and I2C_MSG_OP, for some other kind of
message, which is expected to be very rarely used.

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 include/linux/i2c.h |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 94aed0c..885ebea 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -556,6 +556,12 @@ struct i2c_msg {
 	__u8 *buf;		/* pointer to msg data			*/
 };
 
+#define I2C_MSG_OP(_addr, _buf, _len, _flags) \
+	{ .addr = _addr, .buf = _buf, .len = _len, .flags = _flags }
+
+#define I2C_MSG_WRITE(addr, buf, len) I2C_MSG_OP(addr, buf, len, 0)
+#define I2C_MSG_READ(addr, buf, len)  I2C_MSG_OP(addr, buf, len, I2C_M_RD)
+
 /* To determine what functionality is present */
 
 #define I2C_FUNC_I2C			0x00000001
--
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