diff mbox series

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

Message ID 20210110190529.46135-4-tony@atomide.com (mailing list archive)
State New, archived
Headers show
Series Lost key-up interrupt handling for omap4-keypad | expand

Commit Message

Tony Lindgren Jan. 10, 2021, 7:05 p.m. UTC 
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.

Cc: Arthur Demchenkov <spinal.by@gmail.com>
Cc: Carl Philipp Klemm <philipp@uvos.xyz>
Cc: Merlijn Wajer <merlijn@wizzup.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: ruleh <ruleh@gmx.de>
Cc: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/input/keyboard/omap4-keypad.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

Comments

Dmitry Torokhov Jan. 11, 2021, 4:50 a.m. UTC | #1 
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...
Tony Lindgren Jan. 11, 2021, 5:57 a.m. UTC | #2 
* Dmitry Torokhov <dmitry.torokhov@gmail.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@atomide.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@atomide.com>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.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)
Dmitry Torokhov Jan. 11, 2021, 6:27 a.m. UTC | #3 
On Mon, Jan 11, 2021 at 07:57:39AM +0200, Tony Lindgren wrote:
> * Dmitry Torokhov <dmitry.torokhov@gmail.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.

OK, thanks, applied.
diff mbox series

Patch

diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c
--- 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;
@@ -154,16 +155,18 @@  static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
 	return IRQ_NONE;
 }
 
-static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
+static void omap4_keypad_scan_keys(struct omap4_keypad *keypad_data, bool clear)
 {
-	struct omap4_keypad *keypad_data = dev_id;
 	struct input_dev *input_dev = keypad_data->input;
 	u32 low, high;
-	u64 keys;
+	u64 keys = 0;
 
-	low = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
-	high = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
-	keys = low | (u64)high << 32;
+	mutex_lock(&keypad_data->lock);
+	if (!clear) {
+		low = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
+		high = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
+		keys = low | (u64)high << 32;
+	}
 
 	/* Scan for key up events for lost key-up interrupts */
 	omap4_keypad_scan_state(keypad_data, keys, false);
@@ -175,6 +178,15 @@  static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
 
 	keypad_data->keys = keys;
 
+	mutex_unlock(&keypad_data->lock);
+}
+
+static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
+{
+	struct omap4_keypad *keypad_data = dev_id;
+
+	omap4_keypad_scan_keys(keypad_data, false);
+
 	/* clear pending interrupts */
 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
@@ -307,6 +319,7 @@  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)