linux-kernel - Re: [PATCH v5 2/7] Input: matrix_keypad - add function for reading row state

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Message-ID: <Z7YJcZe90rDWfFoi@mt.com>
Date: Wed, 19 Feb 2025 17:40:17 +0100
From: Manuel Traut <manuel.traut@...com>
To: Markus Burri <markus.burri@...com>
Cc: linux-kernel@...r.kernel.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Marek Vasut <marek.vasut@...il.com>, linux-input@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v5 2/7] Input: matrix_keypad - add function for reading
 row state

On Fri, Jan 10, 2025 at 06:49:01AM +0100, Markus Burri wrote:
> Move the evaluation of a row state into separate function.
> It will be also used by a change later in this series.
> 
> Signed-off-by: Markus Burri <markus.burri@...com>

Reviewed-by: Manuel Traut <manuel.traut@...com>

> 
> ---
>  drivers/input/keyboard/matrix_keypad.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c
> index 5571d2e..90148d3 100644
> --- a/drivers/input/keyboard/matrix_keypad.c
> +++ b/drivers/input/keyboard/matrix_keypad.c
> @@ -100,6 +100,16 @@ static void disable_row_irqs(struct matrix_keypad *keypad)
>  		disable_irq_nosync(keypad->row_irqs[i]);
>  }
>  
> +static uint32_t read_row_state(struct matrix_keypad *keypad)
> +{
> +	int row;
> +	u32 row_state = 0;

uint32_t row_state = 0;

would look more consistent.

> +
> +	for (row = 0; row < keypad->num_row_gpios; row++)
> +		row_state |= row_asserted(keypad, row) ? BIT(row) : 0;
> +	return row_state;
> +}
> +
>  /*
>   * This gets the keys from keyboard and reports it to input subsystem
>   */
> @@ -125,9 +135,7 @@ static void matrix_keypad_scan(struct work_struct *work)
>  
>  		activate_col(keypad, col, true);
>  
> -		for (row = 0; row < keypad->num_row_gpios; row++)
> -			new_state[col] |=
> -				row_asserted(keypad, row) ? BIT(row) : 0;
> +		new_state[col] = read_row_state(keypad);
>  
>  		activate_col(keypad, col, false);
>  	}
> -- 
> 2.39.5
>