Commit 3540c32a authored by Lv Zheng's avatar Lv Zheng Committed by Rafael J. Wysocki
Browse files

ACPI / button: Add quirks for initial lid state notification 

Linux userspace (systemd-logind) keeps on rechecking lid state when the
lid state is closed. If it failed to update the lid state to open after
boot/resume, the system suspending right after the boot/resume could be
resulted.

Graphics drivers also use the lid notifications to implment
MODESET_ON_LID_OPEN option.

Before the situation is improved from the userspace and from the graphics
driver, users can simply configure ACPI button driver to send initial
"open" lid state using button.lid_init_state=open to avoid such kind of
issues.

And our ultimate target should be making button.lid_init_state=ignore
the default behavior.  This patch implements the 2 options and keep the
old behavior (button.lid_init_state=method).

Link: https://lkml.org/2016/3/7/460
Link: https://github.com/systemd/systemd/issues/2087


Signed-off-by: default avatarLv Zheng <lv.zheng@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent ee7e2265

drivers/acpi/button.c

+61 −0
Original line number Diff line number Diff line
@@ -53,6 +53,10 @@ 
#define ACPI_BUTTON_DEVICE_NAME_LID	"Lid Switch"

#define ACPI_BUTTON_TYPE_LID		0x05



#define ACPI_BUTTON_LID_INIT_IGNORE	0x00

#define ACPI_BUTTON_LID_INIT_OPEN	0x01

#define ACPI_BUTTON_LID_INIT_METHOD	0x02



#define _COMPONENT		ACPI_BUTTON_COMPONENT

ACPI_MODULE_NAME("button");
@@ -105,6 +109,7 @@ struct acpi_button { 


static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);

static struct acpi_device *lid_device;

static u8 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;



/* --------------------------------------------------------------------------

                              FS Interface (/proc)
@@ -285,6 +290,21 @@ static int acpi_lid_update_state(struct acpi_device *device) 
	return acpi_lid_notify_state(device, state);

}



static void acpi_lid_initialize_state(struct acpi_device *device)

{

	switch (lid_init_state) {

	case ACPI_BUTTON_LID_INIT_OPEN:

		(void)acpi_lid_notify_state(device, 1);

		break;

	case ACPI_BUTTON_LID_INIT_METHOD:

		(void)acpi_lid_update_state(device);

		break;

	case ACPI_BUTTON_LID_INIT_IGNORE:

	default:

		break;

	}

}



static void acpi_button_notify(struct acpi_device *device, u32 event)

{

	struct acpi_button *button = acpi_driver_data(device);
@@ -341,6 +361,8 @@ 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)

		acpi_lid_initialize_state(device);

	return 0;

}

#endif
@@ -421,6 +443,7 @@ static int acpi_button_add(struct acpi_device *device) 
	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...
@@ -450,4 +473,42 @@ static int acpi_button_remove(struct acpi_device *device) 
	return 0;

}



static int param_set_lid_init_state(const char *val, struct kernel_param *kp)

{

	int result = 0;



	if (!strncmp(val, "open", sizeof("open") - 1)) {

		lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;

		pr_info("Notify initial lid state as open\n");

	} else if (!strncmp(val, "method", sizeof("method") - 1)) {

		lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;

		pr_info("Notify initial lid state with _LID return value\n");

	} else if (!strncmp(val, "ignore", sizeof("ignore") - 1)) {

		lid_init_state = ACPI_BUTTON_LID_INIT_IGNORE;

		pr_info("Do not notify initial lid state\n");

	} else

		result = -EINVAL;

	return result;

}



static int param_get_lid_init_state(char *buffer, struct kernel_param *kp)

{

	switch (lid_init_state) {

	case ACPI_BUTTON_LID_INIT_OPEN:

		return sprintf(buffer, "open");

	case ACPI_BUTTON_LID_INIT_METHOD:

		return sprintf(buffer, "method");

	case ACPI_BUTTON_LID_INIT_IGNORE:

		return sprintf(buffer, "ignore");

	default:

		return sprintf(buffer, "invalid");

	}

	return 0;

}



module_param_call(lid_init_state,

		  param_set_lid_init_state, param_get_lid_init_state,

		  NULL, 0644);

MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state");



module_acpi_driver(acpi_button_driver);

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