linux-kernel - Re: [PATCH 3/5] Input: omap4-keypad - move rest of key scanning to a separate function

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Date:   Mon, 11 Jan 2021 07:57:39 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org,
        Arthur Demchenkov <spinal.by@...il.com>,
        Carl Philipp Klemm <philipp@...s.xyz>,
        Merlijn Wajer <merlijn@...zup.org>,
        Pavel Machek <pavel@....cz>, ruleh <ruleh@....de>,
        Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH 3/5] Input: omap4-keypad - move rest of key scanning to a
 separate function

* Dmitry Torokhov <dmitry.torokhov@...il.com> [210111 04:50]:
> On Sun, Jan 10, 2021 at 09:05:27PM +0200, Tony Lindgren wrote:
> > Let's move rest of the key scanning code to omap4_keypad_scan_keys().
> > We will use omap4_keypad_scan_keys() also for implementing errata
> > handling to clear the stuck last key in the following patch.
> 
> And this one will become then...

Yes great, this works for me.

Thanks,

Tony


> 
> Input: omap4-keypad - move rest of key scanning to a separate function
> 
> From: Tony Lindgren <tony@...mide.com>
> 
> Let's move rest of the key scanning code to omap4_keypad_scan_keys().
> We will use omap4_keypad_scan_keys() also for implementing errata
> handling to clear the stuck last key in the following patch.
> 
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/input/keyboard/omap4-keypad.c |   39 ++++++++++++++++++++++-----------
>  1 file changed, 26 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c
> index 6dcf27af856d..c48705dd049b 100644
> --- a/drivers/input/keyboard/omap4-keypad.c
> +++ b/drivers/input/keyboard/omap4-keypad.c
> @@ -71,6 +71,7 @@ struct omap4_keypad {
>  
>  	void __iomem *base;
>  	unsigned int irq;
> +	struct mutex lock;		/* for key scan */
>  
>  	unsigned int rows;
>  	unsigned int cols;
> @@ -135,6 +136,28 @@ static int omap4_keypad_report_keys(struct omap4_keypad *keypad_data,
>  	return events;
>  }
>  
> +static void omap4_keypad_scan_keys(struct omap4_keypad *keypad_data, u64 keys)
> +{
> +	u64 changed;
> +
> +	mutex_lock(&keypad_data->lock);
> +
> +	changed = keys ^ keypad_data->keys;
> +
> +	/*
> +	 * Report key up events separately and first. This matters in case we
> +	 * lost key-up interrupt and just now catching up.
> +	 */
> +	omap4_keypad_report_keys(keypad_data, changed & ~keys, false);
> +
> +	/* Report key down events */
> +	omap4_keypad_report_keys(keypad_data, changed & keys, true);
> +
> +	keypad_data->keys = keys;
> +
> +	mutex_unlock(&keypad_data->lock);
> +}
> +
>  /* Interrupt handlers */
>  static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
>  {
> @@ -150,24 +173,13 @@ static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
>  {
>  	struct omap4_keypad *keypad_data = dev_id;
>  	u32 low, high;
> -	u64 keys, changed;
> +	u64 keys;
>  
>  	low = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
>  	high = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
>  	keys = low | (u64)high << 32;
>  
> -	changed = keys ^ keypad_data->keys;
> -
> -	/*
> -	 * Report key up events separately and first. This matters in case we
> -	 * lost key-up interrupt and just now catching up.
> -	 */
> -	omap4_keypad_report_keys(keypad_data, changed & ~keys, false);
> -
> -	/* Report key down events */
> -	omap4_keypad_report_keys(keypad_data, changed & keys, true);
> -
> -	keypad_data->keys = keys;
> +	omap4_keypad_scan_keys(keypad_data, keys);
>  
>  	/* clear pending interrupts */
>  	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
> @@ -300,6 +312,7 @@ static int omap4_keypad_probe(struct platform_device *pdev)
>  	}
>  
>  	keypad_data->irq = irq;
> +	mutex_init(&keypad_data->lock);
>  
>  	error = omap4_keypad_parse_dt(dev, keypad_data);
>  	if (error)