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

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Date:	Tue, 18 Sep 2012 07:53:21 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Ryan Mallon <rmallon@...il.com>
cc:	Shubhrajyoti <shubhrajyoti@...com>, 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 Tue, 18 Sep 2012, Ryan Mallon wrote:

> On 18/09/12 15:40, Shubhrajyoti wrote:
>> On Tuesday 18 September 2012 07:21 AM, Ryan Mallon wrote:
>>> Actually, I wonder if it is useful to have something like:.
>> Read and write differ only in the flag also it will be a deviation from
>> what $SUBJECT
>> would warrant.  So could be a separate patch.
>
> Sure, but I think it would help make the code even more readable than
> just converting to C99 initialisers (especially since putting the C99
> initialiser all on one line is hard to read),

The one line thing is the fault of Coccinelle :)

julia

> and there is little sense
> in doing one clean up and then replacing it later with a different clean up.
>
> If you are worried about the duplication of code for a single flag
> difference you could always do:
>
>  #define I2C_OP(_addr, _buf, _len, _flags)	\
> 	...
>
>  #define I2C_WRITE(addr, buf, len) I2C_OP(addr, buf, len, 0)
>  #define I2C_READ(addr, buf, len)  I2C_OP(addr, buf, len, I2C_M_RD)
>
> ~Ryan
>
>>>
>>> 	#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),
>>> 	};
>>
>
>
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