linux-kernel - [PATCH 2/2] Input: synaptics-rmi4 - export nosleep of f01 via sysfs

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Message-Id: <20190220164200.31044-2-aaron.ma@canonical.com>
Date:   Wed, 20 Feb 2019 17:42:00 +0100
From:   Aaron Ma <aaron.ma@...onical.com>
To:     dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, Cheiny@...aptics.com,
        aduggan@...aptics.com, benjamin.tissoires@...hat.com,
        aaron.ma@...onical.com
Subject: [PATCH 2/2] Input: synaptics-rmi4 - export nosleep of f01 via sysfs

Some of ThinkPad X1C6 touchpads didn't wakeup after resume.
Forcing enable nosleep make touchpad back.
Add nosleep via sysfs, so user can control it to workaround issue.

/sys/devices/rmi4-00/nosleep can be written non-zero will enable
nosleep mode.

BugLink: https://bugs.launchpad.net/bugs/1791427
Cc: <stable@...r.kernel.org>
Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
---
 drivers/input/rmi4/rmi_f01.c | 45 ++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/input/rmi4/rmi_f01.c b/drivers/input/rmi4/rmi_f01.c
index 4edaa14fe878..e41d1ec625d9 100644
--- a/drivers/input/rmi4/rmi_f01.c
+++ b/drivers/input/rmi4/rmi_f01.c
@@ -325,12 +325,57 @@ static ssize_t rmi_driver_package_id_show(struct device *dev,
 
 static DEVICE_ATTR(package_id, 0444, rmi_driver_package_id_show, NULL);
 
+static ssize_t rmi_driver_nosleep_show(struct device *dev,
+					  struct device_attribute *dattr,
+					  char *buf)
+{
+	struct rmi_driver_data *data = dev_get_drvdata(dev);
+	struct f01_data *f01 = dev_get_drvdata(&data->f01_container->dev);
+	int f01_nosleep;
+
+	f01_nosleep = ((f01->device_control.ctrl0 & RMI_F01_CTRL0_NOSLEEP_BIT)
+		 ? 1 : 0);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", f01_nosleep);
+}
+
+static ssize_t rmi_driver_nosleep_store(struct device *dev,
+					  struct device_attribute *dattr,
+					  const char *buf, size_t count)
+{
+	struct rmi_driver_data *data = dev_get_drvdata(dev);
+	struct f01_data *f01 = dev_get_drvdata(&data->f01_container->dev);
+	int error;
+
+	if (count <= 0)
+		return count;
+
+	if ('0' == *buf) {
+		f01->device_control.ctrl0 &= ~RMI_F01_CTRL0_NOSLEEP_BIT;
+	} else {
+		f01->device_control.ctrl0 |= RMI_F01_CTRL0_NOSLEEP_BIT;
+	}
+
+	error = rmi_write(data->rmi_dev,
+			data->f01_container->fd.control_base_addr,
+			  f01->device_control.ctrl0);
+	if (error) {
+		dev_err(dev, "Failed to write nosleep mode: %d.\n", error);
+	}
+
+	return count;
+}
+
+static DEVICE_ATTR(nosleep, 0644,
+		rmi_driver_nosleep_show, rmi_driver_nosleep_store);
+
 static struct attribute *rmi_f01_attrs[] = {
 	&dev_attr_manufacturer_id.attr,
 	&dev_attr_date_of_manufacture.attr,
 	&dev_attr_product_id.attr,
 	&dev_attr_firmware_id.attr,
 	&dev_attr_package_id.attr,
+	&dev_attr_nosleep.attr,
 	NULL
 };
 
-- 
2.17.1