linux-kernel - Re: [PATCH 0/11] introduce macros for i2c

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Date:	Mon, 22 Oct 2012 11:18:26 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Jean Delvare <khali@...ux-fr.org>
cc:	Julia Lawall <Julia.Lawall@...6.fr>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	ben-linux@...ff.org, w.sang@...gutronix.de,
	linux-i2c@...r.kernel.org, kernel-janitors@...r.kernel.org,
	rmallon@...il.com, shubhrajyoti@...com,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/11] introduce macros for i2c_msg initialization

I have been looking at this again, with the macros

#define I2C_MSG_OP(_addr, _buf, _len, _flags) \
        { .addr = _addr, .buf = _buf, .len = _len, .flags = _flags }

#define I2C_MSG_WRITE(addr, buf, len) \
        I2C_MSG_OP(addr, buf, len, 0)
#define I2C_MSG_READ(addr, buf, len) \
        I2C_MSG_OP(addr, buf, len, I2C_M_RD)
#define I2C_MSG_WRITE_OP(addr, buf, len, op) \
        I2C_MSG_OP(addr, buf, len, 0 | op)
#define I2C_MSG_READ_OP(addr, buf, len, op) \
        I2C_MSG_OP(addr, buf, len, I2C_M_RD | op)

and the tuners files as a random first example.  This time I haven't made
any adjustments for arrays of size 1.

The following file is a bit unfortunate, because a single structure is
mostly used for writing, but sometimes used for reading, in the function
tda827xa_set_params.  That is, there are explicit assignments to
msg.flags.

drivers/media/tuners/tda827x.c

Currently, this is done in 8 files across the entire kernel.  Would it be
a problem to use a READ or WRITE macro to initialize such a structure,
give that the type is going to change?  Maybe the I2C_MSG_OP macro could
be used, with an explicit flag argument?

julia
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