[PATCH 4/5] input: tc3589x-keypad: support probing from device tree

[PATCH 4/5] input: tc3589x-keypad: support probing from device tree

[Linus Walleij]

Implement device tree probing for the tc3589x keypad driver.
This is modeled on the STMPE keypad driver and tested on the
Ux500 TVK1281618 UIB.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/input/keyboard/tc3589x-keypad.c | 63 +++++++++++++++++++++++++++++++--
 1 file changed, 61 insertions(+), 2 deletions(-)

diff --git a/drivers/input/keyboard/tc3589x-keypad.c b/drivers/input/keyboard/tc3589x-keypad.c
index 208de7c..f6ec0d7 100644
--- a/drivers/input/keyboard/tc3589x-keypad.c
+++ b/drivers/input/keyboard/tc3589x-keypad.c
@@ -297,6 +297,62 @@ static void tc3589x_keypad_close(struct input_dev *input)
 	tc3589x_keypad_disable(keypad);
 }
 
+#ifdef CONFIG_OF
+static const struct tc3589x_keypad_platform_data *
+tc3589x_keypad_of_probe(struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	struct tc3589x_keypad_platform_data *plat;
+	u32 debounce_ms;
+	int proplen;
+
+	if (!np)
+		return ERR_PTR(-ENODEV);
+
+	plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
+	if (!plat)
+		return ERR_PTR(-ENOMEM);
+
+	of_property_read_u8(np, "keypad,num-columns", &plat->kcol);
+	of_property_read_u8(np, "keypad,num-rows", &plat->krow);
+	if (!plat->krow || !plat->kcol ||
+	     plat->krow > TC_KPD_ROWS || plat->kcol > TC_KPD_COLUMNS) {
+		dev_err(dev,
+			"keypad columns/rows not properly specified (%ux%u)\n",
+			plat->kcol, plat->krow);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (!of_get_property(np, "linux,keymap", &proplen)) {
+		dev_err(dev, "property linux,keymap not found\n");
+		return ERR_PTR(-ENOENT);
+	}
+
+	plat->no_autorepeat = of_property_read_bool(np, "linux,no-autorepeat");
+	plat->enable_wakeup = of_property_read_bool(np, "linux,wakeup");
+
+	/* The custom delay format is ms/16 */
+	of_property_read_u32(np, "debounce-delay-ms", &debounce_ms);
+	if (debounce_ms)
+		plat->debounce_period = debounce_ms * 16;
+	else
+		plat->debounce_period = TC_KPD_DEBOUNCE_PERIOD;
+
+	plat->settle_time = TC_KPD_SETTLE_TIME;
+	/* FIXME: should be property of the IRQ resource? */
+	plat->irqtype = IRQF_TRIGGER_FALLING;
+
+	return plat;
+}
+#else
+static inline const struct tc3589x_keypad_platform_data *
+tc3589x_keypad_of_probe(struct device *dev)
+{
+	return ERR_PTR(-ENODEV);
+}
+#endif
+
+
 static int tc3589x_keypad_probe(struct platform_device *pdev)
 {
 	struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
@@ -307,8 +363,11 @@ static int tc3589x_keypad_probe(struct platform_device *pdev)
 
 	plat = tc3589x->pdata->keypad;
 	if (!plat) {
-		dev_err(&pdev->dev, "invalid keypad platform data\n");
-		return -EINVAL;
+		plat = tc3589x_keypad_of_probe(&pdev->dev);
+		if (IS_ERR(plat)) {
+			dev_err(&pdev->dev, "invalid keypad platform data\n");
+			return PTR_ERR(plat);
+		}
 	}
 
 	irq = platform_get_irq(pdev, 0);
-- 
1.8.3.1

Re: [PATCH 4/5] input: tc3589x-keypad: support probing from device tree

[Dmitry Torokhov]

On Tue, Oct 15, 2013 at 11:21:11PM +0200, Linus Walleij wrote:
> Implement device tree probing for the tc3589x keypad driver.
> This is modeled on the STMPE keypad driver and tested on the
> Ux500 TVK1281618 UIB.
> 
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Looks good, should I merge it or you want to take it through another
tree??

> ---
>  drivers/input/keyboard/tc3589x-keypad.c | 63 +++++++++++++++++++++++++++++++--
>  1 file changed, 61 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/input/keyboard/tc3589x-keypad.c b/drivers/input/keyboard/tc3589x-keypad.c
> index 208de7c..f6ec0d7 100644
> --- a/drivers/input/keyboard/tc3589x-keypad.c
> +++ b/drivers/input/keyboard/tc3589x-keypad.c
> @@ -297,6 +297,62 @@ static void tc3589x_keypad_close(struct input_dev *input)
>  	tc3589x_keypad_disable(keypad);
>  }
>  
> +#ifdef CONFIG_OF
> +static const struct tc3589x_keypad_platform_data *
> +tc3589x_keypad_of_probe(struct device *dev)
> +{
> +	struct device_node *np = dev->of_node;
> +	struct tc3589x_keypad_platform_data *plat;
> +	u32 debounce_ms;
> +	int proplen;
> +
> +	if (!np)
> +		return ERR_PTR(-ENODEV);
> +
> +	plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
> +	if (!plat)
> +		return ERR_PTR(-ENOMEM);
> +
> +	of_property_read_u8(np, "keypad,num-columns", &plat->kcol);
> +	of_property_read_u8(np, "keypad,num-rows", &plat->krow);
> +	if (!plat->krow || !plat->kcol ||
> +	     plat->krow > TC_KPD_ROWS || plat->kcol > TC_KPD_COLUMNS) {
> +		dev_err(dev,
> +			"keypad columns/rows not properly specified (%ux%u)\n",
> +			plat->kcol, plat->krow);
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	if (!of_get_property(np, "linux,keymap", &proplen)) {
> +		dev_err(dev, "property linux,keymap not found\n");
> +		return ERR_PTR(-ENOENT);
> +	}
> +
> +	plat->no_autorepeat = of_property_read_bool(np, "linux,no-autorepeat");
> +	plat->enable_wakeup = of_property_read_bool(np, "linux,wakeup");
> +
> +	/* The custom delay format is ms/16 */
> +	of_property_read_u32(np, "debounce-delay-ms", &debounce_ms);
> +	if (debounce_ms)
> +		plat->debounce_period = debounce_ms * 16;
> +	else
> +		plat->debounce_period = TC_KPD_DEBOUNCE_PERIOD;
> +
> +	plat->settle_time = TC_KPD_SETTLE_TIME;
> +	/* FIXME: should be property of the IRQ resource? */
> +	plat->irqtype = IRQF_TRIGGER_FALLING;
> +
> +	return plat;
> +}
> +#else
> +static inline const struct tc3589x_keypad_platform_data *
> +tc3589x_keypad_of_probe(struct device *dev)
> +{
> +	return ERR_PTR(-ENODEV);
> +}
> +#endif
> +
> +
>  static int tc3589x_keypad_probe(struct platform_device *pdev)
>  {
>  	struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
> @@ -307,8 +363,11 @@ static int tc3589x_keypad_probe(struct platform_device *pdev)
>  
>  	plat = tc3589x->pdata->keypad;
>  	if (!plat) {
> -		dev_err(&pdev->dev, "invalid keypad platform data\n");
> -		return -EINVAL;
> +		plat = tc3589x_keypad_of_probe(&pdev->dev);
> +		if (IS_ERR(plat)) {
> +			dev_err(&pdev->dev, "invalid keypad platform data\n");
> +			return PTR_ERR(plat);
> +		}
>  	}
>  
>  	irq = platform_get_irq(pdev, 0);
> -- 
> 1.8.3.1
> 

-- 
Dmitry

Re: [PATCH 4/5] input: tc3589x-keypad: support probing from device tree

[Linus Walleij]

On Wed, Oct 16, 2013 at 8:39 AM, Dmitry Torokhov
<dmitry.torokhov@gmail.com> wrote:
> On Tue, Oct 15, 2013 at 11:21:11PM +0200, Linus Walleij wrote:
>> Implement device tree probing for the tc3589x keypad driver.
>> This is modeled on the STMPE keypad driver and tested on the
>> Ux500 TVK1281618 UIB.
>>
>> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
>
> Looks good, should I merge it or you want to take it through another
> tree??

As this one is only using old device tree bindings
(Documentation/devicetree/bindings/input/matrix-keymap.txt
and friends) I think you can just merge it.

Yours,
Linus Walleij

Re: [PATCH 4/5] input: tc3589x-keypad: support probing from device tree

[Mark Rutland]

On Tue, Oct 15, 2013 at 10:21:11PM +0100, Linus Walleij wrote:
> Implement device tree probing for the tc3589x keypad driver.
> This is modeled on the STMPE keypad driver and tested on the
> Ux500 TVK1281618 UIB.
> 
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
>  drivers/input/keyboard/tc3589x-keypad.c | 63 +++++++++++++++++++++++++++++++--
>  1 file changed, 61 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/input/keyboard/tc3589x-keypad.c b/drivers/input/keyboard/tc3589x-keypad.c
> index 208de7c..f6ec0d7 100644
> --- a/drivers/input/keyboard/tc3589x-keypad.c
> +++ b/drivers/input/keyboard/tc3589x-keypad.c
> @@ -297,6 +297,62 @@ static void tc3589x_keypad_close(struct input_dev *input)
>  	tc3589x_keypad_disable(keypad);
>  }
>  
> +#ifdef CONFIG_OF
> +static const struct tc3589x_keypad_platform_data *
> +tc3589x_keypad_of_probe(struct device *dev)
> +{
> +	struct device_node *np = dev->of_node;
> +	struct tc3589x_keypad_platform_data *plat;
> +	u32 debounce_ms;
> +	int proplen;
> +
> +	if (!np)
> +		return ERR_PTR(-ENODEV);
> +
> +	plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
> +	if (!plat)
> +		return ERR_PTR(-ENOMEM);
> +
> +	of_property_read_u8(np, "keypad,num-columns", &plat->kcol);
> +	of_property_read_u8(np, "keypad,num-rows", &plat->krow);

These look wrong to me, as almost every single use of of_property_read_u8 (or
of_property_read_u16) do. They read _packed_ values out of the dt, and do not
read (u32) cells as u8s or u16s.

The matrix-keymap binding doesn't define these as 8-bit, and the example
binding they are u32 cells. Either the binding document or this code is wrong.

I'm confused as to how this can work. Are you using /bits/ 8 in your dts?

Thanks,
Mark.

Re: [PATCH 4/5] input: tc3589x-keypad: support probing from device tree

[Linus Walleij]

On Thu, Oct 31, 2013 at 5:58 PM, Mark Rutland <mark.rutland@arm.com> wrote:

>> +     plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
>> +     if (!plat)
>> +             return ERR_PTR(-ENOMEM);
>> +
>> +     of_property_read_u8(np, "keypad,num-columns", &plat->kcol);
>> +     of_property_read_u8(np, "keypad,num-rows", &plat->krow);
>
> These look wrong to me, as almost every single use of of_property_read_u8 (or
> of_property_read_u16) do. They read _packed_ values out of the dt, and do not
> read (u32) cells as u8s or u16s.

Yes...

> The matrix-keymap binding doesn't define these as 8-bit, and the example
> binding they are u32 cells. Either the binding document or this code is wrong.

The biding is in patch titled:
"mfd: tc3589x: Add device tree bindings"
and yes, you are right, this seems wrong. (The example in that patch
is wrong too.)

> I'm confused as to how this can work. Are you using /bits/ 8 in your dts?

Yes indeed I do. So it was working fine...

I'll adjust this to use u32:s, even if it seems odd supporting keypads
with 255+ columns and rows... well it's in there.

Yours,
Linus Walleij