linux-kernel - Re: [PATCH 4/5 v3] input: tc3589x-keypad: support probing from device tree

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Date:	Mon, 25 Nov 2013 18:34:34 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	devicetree@...r.kernel.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 4/5 v3] input: tc3589x-keypad: support probing from
 device tree

On Tue, Nov 12, 2013 at 04:31:01PM +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@...aro.org>
> ---
> ChangeLog v2->v3:
> - Use two local u32 variables to avoid weirdness in u8 casting
>   of the resulting values to the pointers.
> ChangeLog v1->v2:
> - Fix rows/columns binding to read two u32's insead of two
>   u8 /bits/ as noted by Mark Rutland.
> ---
>  drivers/input/keyboard/tc3589x-keypad.c | 66 ++++++++++++++++++++++++++++++++-
>  1 file changed, 64 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/input/keyboard/tc3589x-keypad.c b/drivers/input/keyboard/tc3589x-keypad.c
> index 208de7cbb7fa..7f36e7addb86 100644
> --- a/drivers/input/keyboard/tc3589x-keypad.c
> +++ b/drivers/input/keyboard/tc3589x-keypad.c
> @@ -297,6 +297,65 @@ 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 cols, rows;
> +	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_u32(np, "keypad,num-columns", &cols);
> +	of_property_read_u32(np, "keypad,num-rows", &rows);
> +	plat->kcol = (u8) cols;
> +	plat->krow = (u8) rows;
> +	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");

So, have DT overlords settled on the autorepeat property?

> +	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 +366,11 @@ 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);
> -- 

Don't you also want to add MODULE_DEVICE_TABLE entry?

Thanks.

-- 
Dmitry
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