linux-kernel - [PATCH 4/13] drivers/media/tuners/tda18212.c: use macros for i2c

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Date:	Sun,  7 Oct 2012 17:38:35 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Antti Palosaari <crope@....fi>
Cc:	kernel-janitors@...r.kernel.org, rmallon@...il.com,
	shubhrajyoti@...com, Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/13] drivers/media/tuners/tda18212.c: use macros for i2c_msg initialization

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

Introduce use of I2c_MSG_READ/WRITE/OP, for readability.

In the second initialization, a length expressed as an explicit constant is
also re-expressed as the size of the buffer (reg).

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression a,b,c;
identifier x;
@@

struct i2c_msg x =
- {.addr = a, .buf = b, .len = c, .flags = I2C_M_RD}
+ I2C_MSG_READ(a,b,c)
 ;

@@
expression a,b,c;
identifier x;
@@

struct i2c_msg x =
- {.addr = a, .buf = b, .len = c, .flags = 0}
+ I2C_MSG_WRITE(a,b,c)
 ;

@@
expression a,b,c,d;
identifier x;
@@

struct i2c_msg x = 
- {.addr = a, .buf = b, .len = c, .flags = d}
+ I2C_MSG_OP(a,b,c,d)
 ;
// </smpl>

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

---
 drivers/media/tuners/tda18212.c |   20 +++-----------------
 1 file changed, 3 insertions(+), 17 deletions(-)

diff --git a/drivers/media/tuners/tda18212.c b/drivers/media/tuners/tda18212.c
index 5d9f028..fb810ce 100644
--- a/drivers/media/tuners/tda18212.c
+++ b/drivers/media/tuners/tda18212.c
@@ -34,12 +34,7 @@ static int tda18212_wr_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
 	int ret;
 	u8 buf[len+1];
 	struct i2c_msg msg[1] = {
-		{
-			.addr = priv->cfg->i2c_address,
-			.flags = 0,
-			.len = sizeof(buf),
-			.buf = buf,
-		}
+		I2C_MSG_WRITE(priv->cfg->i2c_address, buf, sizeof(buf))
 	};
 
 	buf[0] = reg;
@@ -63,17 +58,8 @@ static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
 	int ret;
 	u8 buf[len];
 	struct i2c_msg msg[2] = {
-		{
-			.addr = priv->cfg->i2c_address,
-			.flags = 0,
-			.len = 1,
-			.buf = &reg,
-		}, {
-			.addr = priv->cfg->i2c_address,
-			.flags = I2C_M_RD,
-			.len = sizeof(buf),
-			.buf = buf,
-		}
+		I2C_MSG_WRITE(priv->cfg->i2c_address, &reg, sizeof(reg)),
+		I2C_MSG_READ(priv->cfg->i2c_address, buf, sizeof(buf))
 	};
 
 	ret = i2c_transfer(priv->i2c, msg, 2);

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