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platform/x86: ideapad-laptop: Add sysfs interface for touchpad state 

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

Signed-off-by: Ritesh Raj Sarraf <rrs@debian.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Ritesh Raj Sarraf 2017-02-18 00:17:56 +05:30 committed by Andy Shevchenko
parent 2ea659a9ef
commit 36ac0d439b
2 changed files with 41 additions and 0 deletions
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8
Documentation/ABI/testing/sysfs-platform-ideapad-laptop
View File

@ -17,3 +17,11 @@ Description:
* 2 -> Dust Cleaning
* 4 -> Efficient Thermal Dissipation Mode
What: /sys/devices/platform/ideapad/touchpad
Date: May 2017
KernelVersion: 4.13
Contact: "Ritesh Raj Sarraf <rrs@debian.org>"
Description:
Control touchpad mode.
* 1 -> Switched On
* 0 -> Switched Off

33
drivers/platform/x86/ideapad-laptop.c
View File

@ -423,9 +423,42 @@ 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);
bool state;
int ret;
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
};