linux-kernel - RE: [PATCH 1/2] Input: edt-ft5x06

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Date:   Tue, 25 Jun 2019 08:44:29 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Dmitry Torokhov' <dmitry.torokhov@...il.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>
CC:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Marco Felsch <m.felsch@...gutronix.de>,
        Benoit Parrot <bparrot@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] Input: edt-ft5x06 - use get_unaligned_be16()

From: Dmitry Torokhov
> Sent: 23 June 2019 07:32
> 
> Instead of doing conversion by hand, let's use the proper accessors.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/input/touchscreen/edt-ft5x06.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
> index c639ebce914c..ec770226e119 100644
> --- a/drivers/input/touchscreen/edt-ft5x06.c
> +++ b/drivers/input/touchscreen/edt-ft5x06.c
> @@ -27,6 +27,7 @@
>  #include <linux/gpio/consumer.h>
>  #include <linux/input/mt.h>
>  #include <linux/input/touchscreen.h>
> +#include <asm/unaligned.h>
> 
>  #define WORK_REGISTER_THRESHOLD		0x00
>  #define WORK_REGISTER_REPORT_RATE	0x08
> @@ -239,8 +240,8 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
>  		if (tsdata->version == EDT_M06 && type == TOUCH_EVENT_DOWN)
>  			continue;
> 
> -		x = ((buf[0] << 8) | buf[1]) & 0x0fff;
> -		y = ((buf[2] << 8) | buf[3]) & 0x0fff;
> +		x = get_unaligned_be16(buf) & 0x0fff;
> +		y = get_unaligned_be16(buf + 2) & 0x0fff;

You might as well delete the pointless masking with 0xff.

	David

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