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authorHans de Goede <hdegoede@redhat.com>2017-09-11 17:07:06 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-11-09 02:30:44 +0300
commit84d3f6b76447896919c63b28ad71f71238cefcce (patch)
tree0ee00fa0c6532ba48342e55011e38b972774a79c /drivers/acpi/button.c
parent39dae59d66acd86d1de24294bd2f343fd5e7a625 (diff)
downloadlinux-84d3f6b76447896919c63b28ad71f71238cefcce.tar.xz
ACPI / button: Delay acpi_lid_initialize_state() until first user space open
ACPI _LID methods may depend on OpRegions and do not always handle handlers for those OpRegions not being present properly e.g. : Method (_LID, 0, NotSerialized) // _LID: Lid Status { If ((^^I2C5.PMI1.AVBL == One) && (^^GPO2.AVBL == One)) { Return (^^GPO2.LPOL) /* \_SB_.GPO2.LPOL */ } } Note the missing Return (1) when either of the OpRegions is not available, this causes (in this case) a report of the lid-switch being closed, which causes userspace to do an immediate suspend at boot. This commit delays getting the initial state and thus calling _LID for the first time until userspace opens the /dev/input/event# node. This ensures that all drivers will have had a chance to load and registerer their OpRegions before the first _LID call, fixing this issue. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/button.c')
-rw-r--r--drivers/acpi/button.c26
1 files changed, 21 insertions, 5 deletions
diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index ef1856b15488..c391898b483c 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -390,6 +390,7 @@ static void acpi_button_notify(struct acpi_device *device, u32 event)
{
struct acpi_button *button = acpi_driver_data(device);
struct input_dev *input;
+ int users;
switch (event) {
case ACPI_FIXED_HARDWARE_EVENT:
@@ -398,7 +399,11 @@ static void acpi_button_notify(struct acpi_device *device, u32 event)
case ACPI_BUTTON_NOTIFY_STATUS:
input = button->input;
if (button->type == ACPI_BUTTON_TYPE_LID) {
- acpi_lid_update_state(device);
+ mutex_lock(&button->input->mutex);
+ users = button->input->users;
+ mutex_unlock(&button->input->mutex);
+ if (users)
+ acpi_lid_update_state(device);
} else {
int keycode;
@@ -442,12 +447,24 @@ static int acpi_button_resume(struct device *dev)
struct acpi_button *button = acpi_driver_data(device);
button->suspended = false;
- if (button->type == ACPI_BUTTON_TYPE_LID)
+ if (button->type == ACPI_BUTTON_TYPE_LID && button->input->users)
acpi_lid_initialize_state(device);
return 0;
}
#endif
+static int acpi_lid_input_open(struct input_dev *input)
+{
+ struct acpi_device *device = input_get_drvdata(input);
+ struct acpi_button *button = acpi_driver_data(device);
+
+ button->last_state = !!acpi_lid_evaluate_state(device);
+ button->last_time = ktime_get();
+ acpi_lid_initialize_state(device);
+
+ return 0;
+}
+
static int acpi_button_add(struct acpi_device *device)
{
struct acpi_button *button;
@@ -488,8 +505,7 @@ static int acpi_button_add(struct acpi_device *device)
strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
sprintf(class, "%s/%s",
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
- button->last_state = !!acpi_lid_evaluate_state(device);
- button->last_time = ktime_get();
+ input->open = acpi_lid_input_open;
} else {
printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
error = -ENODEV;
@@ -522,11 +538,11 @@ static int acpi_button_add(struct acpi_device *device)
break;
}
+ input_set_drvdata(input, device);
error = input_register_device(input);
if (error)
goto err_remove_fs;
if (button->type == ACPI_BUTTON_TYPE_LID) {
- acpi_lid_initialize_state(device);
/*
* This assumes there's only one lid device, or if there are
* more we only care about the last one...