[PATCH 13/13] drivers/media/tuners/e4000.c: use macros for i2c_msg initialization

Julia Lawall
2012-10-07T15:39:20Z

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

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

In the second i2c_msg structure, 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@lip6.fr>

---
drivers/media/tuners/e4000.c | 20 +++-----------------
1 file changed, 3 insertions(+), 17 deletions(-)

diff --git a/drivers/media/tuners/e4000.c b/drivers/media/tuners/e4000.c
index 1b33ed3..8f182fc 100644
--- a/drivers/media/tuners/e4000.c
+++ b/drivers/media/tuners/e4000.c
@@ -26,12 +26,7 @@ static int e4000_wr_regs(struct e4000_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;
@@ -54,17 +49,8 @@ static int e4000_rd_regs(struct e4000_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);