linux-kernel - Re: [PATCH 13/13] drivers/media/tuners/e4000.c: use macros for i2c

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Message-ID: <5071AEF3.6080108@bfs.de>
Date:	Sun, 07 Oct 2012 18:33:55 +0200
From:	walter harms <wharms@....de>
To:	Julia Lawall <Julia.Lawall@...6.fr>
CC:	Antti Palosaari <crope@....fi>, 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: Re: [PATCH 13/13] drivers/media/tuners/e4000.c: use macros for i2c_msg
 initialization



Am 07.10.2012 17:38, schrieb Julia Lawall:
> From: Julia Lawall <Julia.Lawall@...6.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@...6.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))
>  	};
>  

Any reason why struct i2c_msg is an array ?

re,
 wh

>  	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);
> 
> --
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> 
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