path: root/drivers
diff options
authorHans de Goede <hdegoede@redhat.com>2017-05-09 10:04:36 +0200
committerJiri Kosina <jkosina@suse.cz>2017-05-29 13:07:45 +0200
commitf3d3eab667de62572376abb1aa26316191c39929 (patch)
tree073c04e3e7e9aa73338498b0f758c71c39ff7556 /drivers
parentHID: asus: Add support for T100 keyboard (diff)
HID: i2c: Call acpi_device_fix_up_power for ACPI-enumerated devices
For ACPI devices which do not have a _PSC method, the ACPI subsys cannot query their initial state at boot, so these devices are assumed to have been put in D0 by the BIOS, but for touchscreens that is not always true. This commit adds a call to acpi_device_fix_up_power to explicitly put devices without a _PSC method into D0 state (for devices with a _PSC method it is a nop). Note we only need to do this on probe, after a resume the ACPI subsys knows the device is in D3 and will properly put it in D0. This fixes the SIS0817 i2c-hid touchscreen on a Peaq C1010 2-in-1 device failing to probe with a "hid_descr_cmd failed" error. Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers')
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 8daa8ce64ebb..fb55fb4c39fc 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -897,6 +897,15 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client,
return 0;
+static void i2c_hid_acpi_fix_up_power(struct device *dev)
+ acpi_handle handle = ACPI_HANDLE(dev);
+ struct acpi_device *adev;
+ if (handle && acpi_bus_get_device(handle, &adev) == 0)
+ acpi_device_fix_up_power(adev);
static const struct acpi_device_id i2c_hid_acpi_match[] = {
{"ACPI0C50", 0 },
{"PNP0C50", 0 },
@@ -909,6 +918,8 @@ static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
return -ENODEV;
+static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
#ifdef CONFIG_OF
@@ -1030,6 +1041,8 @@ static int i2c_hid_probe(struct i2c_client *client,
if (ret < 0)
goto err_regulator;
+ i2c_hid_acpi_fix_up_power(&client->dev);