[PATCH 3/13] drivers/media/tuners/qt1010.c: use macros for i2c_msg initialization

Julia Lawall
2012-10-07T15:39:22Z

From: Julia Lawall <Julia.Lawall@lip6.fr>

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

A length expressed as an explicit constant is also re-expressed as the size
of the buffer, when this is possible.

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@lip6.fr>

---
drivers/media/tuners/qt1010.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/media/tuners/qt1010.c b/drivers/media/tuners/qt1010.c
index bc419f8..37ff254 100644
--- a/drivers/media/tuners/qt1010.c
+++ b/drivers/media/tuners/qt1010.c
@@ -25,10 +25,8 @@
static int qt1010_readreg(struct qt1010_priv *priv, u8 reg, u8 *val)
{
struct i2c_msg msg[2] = {
- { .addr = priv->cfg->i2c_address,
- .flags = 0, .buf = &reg, .len = 1 },
- { .addr = priv->cfg->i2c_address,
- .flags = I2C_M_RD, .buf = val, .len = 1 },
+ I2C_MSG_WRITE(priv->cfg->i2c_address, &reg, sizeof(reg)),
+ I2C_MSG_READ(priv->cfg->i2c_address, val, 1),
};

if (i2c_transfer(priv->i2c, msg, 2) != 2) {
@@ -43,8 +41,8 @@ static int qt1010_readreg(struct qt1010_priv *priv, u8 reg, u8 *val)
static int qt1010_writereg(struct qt1010_priv *priv, u8 reg, u8 val)
{
u8 buf[2] = { reg, val };
- struct i2c_msg msg = { .addr = priv->cfg->i2c_address,
- .flags = 0, .buf = buf, .len = 2 };
+ struct i2c_msg msg = I2C_MSG_WRITE(priv->cfg->i2c_address, buf,
+ sizeof(buf));

if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
dev_warn(&priv->i2c->dev, "%s: i2c wr failed reg=%02x\n",