[PATCH 8/13] drivers/media/tuners/fc2580.c: use macros for i2c_msg initialization

From: Julia Lawall
Date: Sun Oct 07 2012 - 11:40:32 EST


From: Julia Lawall <Julia.Lawall@xxxxxxx>

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 in each case.

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@xxxxxxx>

---
drivers/media/tuners/fc2580.c | 20 +++-----------------
1 file changed, 3 insertions(+), 17 deletions(-)

diff --git a/drivers/media/tuners/fc2580.c b/drivers/media/tuners/fc2580.c
index aff39ae..d0c0ff1 100644
--- a/drivers/media/tuners/fc2580.c
+++ b/drivers/media/tuners/fc2580.c
@@ -45,12 +45,7 @@ static int fc2580_wr_regs(struct fc2580_priv *priv, u8 reg, u8 *val, int len)
int ret;
u8 buf[1 + len];
struct i2c_msg msg[1] = {
- {
- .addr = priv->cfg->i2c_addr,
- .flags = 0,
- .len = sizeof(buf),
- .buf = buf,
- }
+ I2C_MSG_WRITE(priv->cfg->i2c_addr, buf, sizeof(buf))
};

buf[0] = reg;
@@ -73,17 +68,8 @@ static int fc2580_rd_regs(struct fc2580_priv *priv, u8 reg, u8 *val, int len)
int ret;
u8 buf[len];
struct i2c_msg msg[2] = {
- {
- .addr = priv->cfg->i2c_addr,
- .flags = 0,
- .len = 1,
- .buf = &reg,
- }, {
- .addr = priv->cfg->i2c_addr,
- .flags = I2C_M_RD,
- .len = sizeof(buf),
- .buf = buf,
- }
+ I2C_MSG_WRITE(priv->cfg->i2c_addr, &reg, sizeof(reg)),
+ I2C_MSG_READ(priv->cfg->i2c_addr, buf, sizeof(buf))
};

ret = i2c_transfer(priv->i2c, msg, 2);

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