linux-kernel - Re: [PATCH v4] platform/x86: ideapad-laptop: Add sysfs interface for touchpad state

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Date:   Wed, 22 Feb 2017 15:54:18 +0530
From:   Ritesh Raj Sarraf <rrs@...ian.org>
To:     platform-driver-x86@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Darren Hart <dvhart@...radead.org>
Cc:     Ike Panhc <ike.pan@...onical.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] platform/x86: ideapad-laptop: Add sysfs interface
 for touchpad state

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Hello Darren / Andy,

Any further comment on this patch ? Will this be accepted ?
Please give a N/ACK.

Thanks,
Ritesh

On Sat, 2017-02-18 at 00:17 +0530, Ritesh Raj Sarraf wrote:
> Lenovo Yoga (many variants: Yoga, Yoga2 Pro, Yoga2 13, Yoga3 Pro, Yoga 3
> 14 etc) has multiple modles that are a hybrid laptop, working in laptop
> mode as well as tablet mode.
> 
> Currently, there is no easy interface to determine the touchpad status,
> which in case of the Yoga family of machines, can also be useful to
> assume tablet mode status.
> Note: The ideapad-laptop driver does not provide a SW_TABLET_MODE either
> 
> For a detailed discussion  on why we want either of the interfaces,
> please see:
> https://bugs.launchpad.net/onboard/+bug/1366421/comments/43
> 
> This patch adds a sysfs interface for read/write access under:
> /sys/bus/platform/devices/VPC2004\:00/touchpad_mode
> 
> v4:
> Use kstrtobool because supported values are boolean
> 
> v3:
> Include Darren Hart's comments
> Changed sysfs inteface from "touchpad_mode" to "touchpad"
> 
> v2:
> Include Andy Shevchenko's comments
> 
> Signed-off-by: Ritesh Raj Sarraf <rrs@...ian.org>
> ---
>  .../ABI/testing/sysfs-platform-ideapad-laptop      |  8 +++++
>  drivers/platform/x86/ideapad-laptop.c              | 34
> ++++++++++++++++++++++
>  2 files changed, 42 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-platform-ideapad-laptop
> b/Documentation/ABI/testing/sysfs-platform-ideapad-laptop
> index b31e782bd985..5d24f1e8e6ef 100644
> --- a/Documentation/ABI/testing/sysfs-platform-ideapad-laptop
> +++ b/Documentation/ABI/testing/sysfs-platform-ideapad-laptop
> @@ -17,3 +17,11 @@ Description:
>  			* 2 -> Dust Cleaning
>  			* 4 -> Efficient Thermal Dissipation Mode
>  
> +What:		/sys/devices/platform/ideapad/touchpad
> +Date:		Feb 2017
> +KernelVersion:	4.11
> +Contact:	"Ritesh Raj Sarraf <rrs@...ian.org>"
> +Description:
> +		Control touchpad mode.
> +			* 1 -> Switched On
> +			* 0 -> Switched Off
> diff --git a/drivers/platform/x86/ideapad-laptop.c
> b/drivers/platform/x86/ideapad-laptop.c
> index f46ece2ce3c4..b35954707e11 100644
> --- a/drivers/platform/x86/ideapad-laptop.c
> +++ b/drivers/platform/x86/ideapad-laptop.c
> @@ -423,9 +423,43 @@ static ssize_t store_ideapad_fan(struct device *dev,
>  
>  static DEVICE_ATTR(fan_mode, 0644, show_ideapad_fan, store_ideapad_fan);
>  
> +
> +static ssize_t touchpad_show(struct device *dev,
> +				struct device_attribute *attr,
> +				char *buf)
> +{
> +	struct ideapad_private *priv = dev_get_drvdata(dev);
> +	unsigned long result;
> +
> +	if (read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &result))
> +		return sprintf(buf, "-1\n");
> +	return sprintf(buf, "%lu\n", result);
> +}
> +
> +static ssize_t touchpad_store(struct device *dev,
> +				 struct device_attribute *attr,
> +				 const char *buf, size_t count)
> +{
> +	struct ideapad_private *priv = dev_get_drvdata(dev);
> +	int ret;
> +	bool state;
> +
> +	ret = kstrtobool(buf, &state);
> +	if (ret)
> +		return ret;
> +
> +	ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_TOUCHPAD, state);
> +	if (ret < 0)
> +		return -EIO;
> +	return count;
> +}
> +
> +static DEVICE_ATTR_RW(touchpad);
> +
>  static struct attribute *ideapad_attributes[] = {
>  	&dev_attr_camera_power.attr,
>  	&dev_attr_fan_mode.attr,
> +	&dev_attr_touchpad.attr,
>  	NULL
>  };
>  
- -- 
Ritesh Raj Sarraf | http://people.debian.org/~rrs
Debian - The Universal Operating System
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