linux-kernel - Re: [PATCH 3/7] rtc: Convert struct i2c

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Date:	Tue, 18 Sep 2012 11:51:30 +1000
From:	Ryan Mallon <rmallon@...il.com>
To:	Shubhrajyoti D <shubhrajyoti@...com>
CC:	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	julia.lawall@...6.fr
Subject: Re: [PATCH 3/7] rtc: Convert struct i2c_msg initialization to C99
 format

On 17/09/12 23:58, Shubhrajyoti D wrote:
>     Convert the struct i2c_msg initialization to C99 format. This makes
>     maintaining and editing the code simpler. Also helps once other fields
>     like transferred are added in future.
> 
> Signed-off-by: Shubhrajyoti D <shubhrajyoti@...com>
> ---
>  drivers/rtc/rtc-isl1208.c |    6 +++---
>  1 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
> index dd2aeee..c3a76ae 100644
> --- a/drivers/rtc/rtc-isl1208.c
> +++ b/drivers/rtc/rtc-isl1208.c
> @@ -68,9 +68,9 @@ isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
>  {
>  	u8 reg_addr[1] = { reg };
>  	struct i2c_msg msgs[2] = {
> -		{client->addr, 0, sizeof(reg_addr), reg_addr}
> +		{.addr = client->addr, .flags = 0, .len = sizeof(reg_addr), .buf = reg_addr}

Actually, I wonder if it is useful to have something like:

	#define I2C_WRITE(_addr, _buf, _len) {	\
		.addr	= _addr,		\
		.buf	= _buf,			\
		.len	= _len,			\
	}

	#define I2C_READ(_addr, _buf, _len) {	\
		.addr	= _addr,		\
		.buf	= _buf,			\
		.len	= _len,			\
		.flags	= I2C_M_RD,		\
	}

and then write this as:

	struct i2c_msg msgs[2] = {
		I2C_WRITE(client->addr, reg_addr, sizeof(reg_addr)),
		I2C_READ(client->addr, buf, len),
	};

~Ryan




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