Re: [PATCH 1/2] input: Add RAVE SP Powerbutton driver

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Hi Andrey,

On Mon, Feb 26, 2018 at 07:41:29AM -0800, Andrey Smirnov wrote:
> Add driver that properly handles input event emitted by RAVE SP
> devices.
> 
> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> Cc: linux-input@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: devicetree@vger.kernel.org
> Cc: Guenter Roeck <linux@roeck-us.net>
> Cc: Chris Healy <cphealy@gmail.com>
> Cc: Lucas Stach <l.stach@pengutronix.de>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
> ---
>  drivers/input/misc/Kconfig             |  9 ++++
>  drivers/input/misc/Makefile            |  1 +
>  drivers/input/misc/rave-sp-pwrbutton.c | 92 ++++++++++++++++++++++++++++++++++
>  3 files changed, 102 insertions(+)
>  create mode 100644 drivers/input/misc/rave-sp-pwrbutton.c
> 
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index 62a1312a7387..6a3c753b093b 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -841,4 +841,13 @@ config INPUT_HISI_POWERKEY
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called hisi_powerkey.
>  
> +config INPUT_RAVE_SP_PWRBUTTON
> +	tristate "RAVE SP Power button Driver"
> +	depends on RAVE_SP_CORE
> +	help
> +	  Say Y here if you want to enable power key reporting from RAVE SP
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called rave-sp-pwrbutton.
> +
>  endif
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index a8f61af865aa..6ebeec1f4dd0 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -80,3 +80,4 @@ obj-$(CONFIG_INPUT_WM831X_ON)		+= wm831x-on.o
>  obj-$(CONFIG_INPUT_XEN_KBDDEV_FRONTEND)	+= xen-kbdfront.o
>  obj-$(CONFIG_INPUT_YEALINK)		+= yealink.o
>  obj-$(CONFIG_INPUT_IDEAPAD_SLIDEBAR)	+= ideapad_slidebar.o
> +obj-$(CONFIG_INPUT_RAVE_SP_PWRBUTTON)	+= rave-sp-pwrbutton.o

Please put it in [somewhat] alphabetical order (even though ideapad is
out of order). 


> diff --git a/drivers/input/misc/rave-sp-pwrbutton.c b/drivers/input/misc/rave-sp-pwrbutton.c
> new file mode 100644
> index 000000000000..7511062c724b
> --- /dev/null
> +++ b/drivers/input/misc/rave-sp-pwrbutton.c
> @@ -0,0 +1,92 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * Power Button driver for RAVE SP
> + *
> + * Copyright (C) 2017 Zodiac Inflight Innovations
> + *
> + */

Let's keep SPDX and copyright in the same // comment block.

> +
> +#include <linux/input.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mfd/rave-sp.h>
> +#include <linux/platform_device.h>
> +
> +#define RAVE_SP_EVNT_BUTTON_PRESS	(RAVE_SP_EVNT_BASE + 0x00)
> +
> +struct rave_sp_power_button {
> +	struct input_dev *idev;
> +	struct notifier_block nb;
> +};
> +
> +static int rave_sp_power_button_event(struct notifier_block *nb,
> +				      unsigned long action, void *data)
> +{
> +	struct rave_sp_power_button *pb =
> +		container_of(nb, struct rave_sp_power_button, nb);
> +	const u8 event = rave_sp_action_unpack_event(action);
> +	const u8 value = rave_sp_action_unpack_value(action);
> +	struct input_dev *idev = pb->idev;
> +
> +	if (event == RAVE_SP_EVNT_BUTTON_PRESS) {
> +		input_report_key(idev, KEY_POWER, value);
> +		input_sync(idev);
> +
> +		return NOTIFY_STOP;
> +	}
> +
> +	return NOTIFY_DONE;
> +}
> +
> +static int rave_sp_pwrbutton_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct rave_sp_power_button *pb;
> +	struct input_dev *idev;
> +	int ret;
> +
> +	pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL);
> +	if (!pb)
> +		return -ENOMEM;
> +
> +	idev = devm_input_allocate_device(dev);
> +	if (!idev)
> +		return -ENOMEM;
> +
> +	idev->name = pdev->name;
> +	idev->dev.parent = dev;

Not needed - done by devm_input_allocate_device().

> +
> +	input_set_capability(idev, EV_KEY, KEY_POWER);
> +
> +	ret = input_register_device(idev);
> +	if (ret)
> +		return ret;

Please call this "error".

> +
> +	pb->idev = idev;
> +	pb->nb.notifier_call = rave_sp_power_button_event;
> +	pb->nb.priority = 128;
> +
> +	return devm_rave_sp_register_event_notifier(dev, &pb->nb);

Prefer

	error = devm_rave...();
	if (error)
		return error;

	return 0;

> +}
> +
> +static const struct of_device_id rave_sp_pwrbutton_of_match[] = {
> +	{ .compatible = "zii,rave-sp-pwrbutton" },
> +	{}
> +};
> +
> +static struct platform_driver rave_sp_pwrbutton_driver = {
> +	.probe = rave_sp_pwrbutton_probe,
> +	.driver	= {
> +		.name = KBUILD_MODNAME,
> +		.of_match_table = rave_sp_pwrbutton_of_match,
> +	},
> +};
> +module_platform_driver(rave_sp_pwrbutton_driver);
> +
> +MODULE_DEVICE_TABLE(of, rave_sp_pwrbutton_of_match);
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>");
> +MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>");
> +MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
> +MODULE_DESCRIPTION("RAVE SP Power Button driver");
> -- 
> 2.14.3
> 

-- 
Dmitry