linux-kernel - Re: [PATCH 1/3] max7359_keypad: Do not set MAX7359_CFG

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Message-ID: <20150515205244.GE696@dtor-ws>
Date:	Fri, 15 May 2015 13:52:44 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] max7359_keypad: Do not set MAX7359_CFG_INTERRUPT flag

On Thu, May 14, 2015 at 05:34:50AM +0300, Evgeniy Dushistov wrote:
> max7359_keypad: Do not set MAX7359_CFG_INTERRUPT flag. 
> In datasheet of max7359, there is description of this flag:
> 0 - INT cleared when FIFO empty,
> 1 - INT cleared after host read. In this mode, I2C should read
>  FIFO until interrupt condition removed, or further INT may be lost.
> 
> So, if we set this flag, we have to read FIFO until it become
> empty. But in interrupt we read FIFO just once.
> This lead to "keyboard" hang until reboot, if we press
> several keys, because of interrupt handler read just one
> "press" from FIFO and clear interrupt.
> 
> Signed-off-by: Evgeniy A. Dushistov <dushistov@...l.ru>

Applied, thank you.

> ---
>  drivers/input/keyboard/max7359_keypad.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/input/keyboard/max7359_keypad.c b/drivers/input/keyboard/max7359_keypad.c
> index faa6da5..4e35904 100644
> --- a/drivers/input/keyboard/max7359_keypad.c
> +++ b/drivers/input/keyboard/max7359_keypad.c
> @@ -166,7 +166,6 @@ static void max7359_close(struct input_dev *dev)
>  static void max7359_initialize(struct i2c_client *client)
>  {
>  	max7359_write_reg(client, MAX7359_REG_CONFIG,
> -		MAX7359_CFG_INTERRUPT | /* Irq clears after host read */
>  		MAX7359_CFG_KEY_RELEASE | /* Key release enable */
>  		MAX7359_CFG_WAKEUP); /* Key press wakeup enable */
>  
> -- 
> 2.3.6
> 
> -- 
> /Evgeniy

-- 
Dmitry
--
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