linux-kernel - Re: [RFC PATCH 01/06] input/rmi4: Public header and documentation

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Message-ID: <20121011082051.GB32175@core.coreip.homeip.net>
Date:	Thu, 11 Oct 2012 01:20:51 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Christopher Heiny <cheiny@...aptics.com>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Input <linux-input@...r.kernel.org>,
	Allie Xiong <axiong@...aptics.com>,
	Vivian Ly <vly@...aptics.com>,
	Daniel Rosenberg <daniel.rosenberg@...aptics.com>,
	Alexandra Chen <alexandra.chen@...synaptics.com>,
	Joerie de Gram <j.de.gram@...il.com>,
	Wolfram Sang <w.sang@...gutronix.de>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Naveen Kumar Gaddipati <naveen.gaddipati@...ricsson.com>
Subject: Re: [RFC PATCH 01/06] input/rmi4: Public header and documentation

On Fri, Oct 05, 2012 at 09:09:58PM -0700, Christopher Heiny wrote:
> +
> +	int (*write_block)(struct rmi_phys_device *phys, u16 addr, u8 *buf,
> +			   int len);
> +	int (*read_block)(struct rmi_phys_device *phys, u16 addr, u8 *buf,
> +			  int len);
> +

If you declare your buffer as [const] void * instead of u8 * I think you
will be able to get rid of most of your unions.

> +
> +/**
> + * Helper fn to convert a byte array representing a 16 bit value in the RMI
> + * endian-ness to a 16-bit value in the native processor's specific endianness.
> + * We don't use ntohs/htons here because, well, we're not dealing with
> + * a pair of 16 bit values. Casting dest to u16* wouldn't work, because
> + * that would imply knowing the byte order of u16 in the first place.  The
> + * same applies for using shifts and masks.
> + */
> +static inline u16 batohs(u8 *src)
> +{
> +	return src[1] * 0x100 + src[0];
> +}
> +
> +/**
> + * Helper function to convert a 16 bit value (in host processor endianess) to
> + * a byte array in the RMI endianess for u16s.  See above comment for
> + * why we dont us htons or something like that.
> + */
> +static inline void hstoba(u8 *dest, u16 src)
> +{
> +	dest[0] = src % 0x100;
> +	dest[1] = src / 0x100;
> +}

These are not used anymore, right?

-- 
Dmitry
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