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: <sta...@vger.kernel.org> Signed-off-by: Aaron Ma <aaron...@canonical.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
