linux-kernel - Re: [PATCH] Input: adp5589-keys

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Date:   Wed, 18 Nov 2020 23:44:02 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     linux-input@...r.kernel.org,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: adp5589-keys - use BIT()

On Wed, Nov 18, 2020 at 11:34:28PM -0800, Joe Perches wrote:
> On Wed, 2020-11-18 at 23:24 -0800, Dmitry Torokhov wrote:
> > Let's use BIT() macro instead of explicitly shifting '1'.
> []
> > diff --git a/drivers/input/keyboard/adp5589-keys.c b/drivers/input/keyboard/adp5589-keys.c
> 
> > @@ -651,13 +652,13 @@ static int adp5589_setup(struct adp5589_kpad *kpad)
> >  		unsigned short pin = pdata->gpimap[i].pin;
> >  
> 
> trivia:
> 
> Perhaps nicer to create and use a temporary
> 
> 	unsigned int bit = BIT(pin - kpad->var->gpi_pin_col_base);
> 
> so in these places below:
> 
> >  		if (pin <= kpad->var->gpi_pin_row_end) {
> > -			evt_mode1 |= (1 << (pin - kpad->var->gpi_pin_row_base));
> > +			evt_mode1 |= BIT(pin - kpad->var->gpi_pin_row_base);
> 
> 			evt_mode1 |= bit;
> 
> >  		} else {
> >  			evt_mode2 |=
> > -			    ((1 << (pin - kpad->var->gpi_pin_col_base)) & 0xFF);
> > +			    BIT(pin - kpad->var->gpi_pin_col_base) & 0xFF;
> 
> 			evt_mode2 |= bit & 0xff;

Different "bit" tough - row vs column.

> 
> >  			if (!kpad->is_adp5585)
> > -				evt_mode3 |= ((1 << (pin -
> > -					kpad->var->gpi_pin_col_base)) >> 8);
> > +				evt_mode3 |=
> > +				    BIT(pin - kpad->var->gpi_pin_col_base) >> 8;
> 
> 				evt_mode3 |= bit >> 8;
> 
> 

Thanks.

-- 
Dmitry