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@@ -113,6 +113,9 @@ static const struct file_operations acpi_button_state_fops = {
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.release = single_release,
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};
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+static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
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+static struct acpi_device *lid_device;
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+
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/* --------------------------------------------------------------------------
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FS Interface (/proc)
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-------------------------------------------------------------------------- */
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@@ -229,11 +232,38 @@ static int acpi_button_remove_fs(struct acpi_device *device)
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/* --------------------------------------------------------------------------
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Driver Interface
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-------------------------------------------------------------------------- */
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+int acpi_lid_notifier_register(struct notifier_block *nb)
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+{
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+ return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
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+}
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+EXPORT_SYMBOL(acpi_lid_notifier_register);
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+
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+int acpi_lid_notifier_unregister(struct notifier_block *nb)
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+{
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+ return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
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+}
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+EXPORT_SYMBOL(acpi_lid_notifier_unregister);
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+
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+int acpi_lid_open(void)
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+{
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+ acpi_status status;
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+ unsigned long long state;
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+
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+ status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
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+ &state);
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+ if (ACPI_FAILURE(status))
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+ return -ENODEV;
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+
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+ return !!state;
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+}
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+EXPORT_SYMBOL(acpi_lid_open);
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+
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static int acpi_lid_send_state(struct acpi_device *device)
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{
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struct acpi_button *button = acpi_driver_data(device);
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unsigned long long state;
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acpi_status status;
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+ int ret;
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status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
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if (ACPI_FAILURE(status))
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@@ -242,7 +272,12 @@ static int acpi_lid_send_state(struct acpi_device *device)
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/* input layer checks if event is redundant */
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input_report_switch(button->input, SW_LID, !state);
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input_sync(button->input);
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- return 0;
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+
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+ ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
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+ if (ret == NOTIFY_DONE)
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+ ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
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+ device);
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+ return ret;
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}
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static void acpi_button_notify(struct acpi_device *device, u32 event)
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@@ -364,8 +399,14 @@ static int acpi_button_add(struct acpi_device *device)
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error = input_register_device(input);
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if (error)
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goto err_remove_fs;
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- if (button->type == ACPI_BUTTON_TYPE_LID)
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+ if (button->type == ACPI_BUTTON_TYPE_LID) {
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acpi_lid_send_state(device);
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+ /*
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+ * This assumes there's only one lid device, or if there are
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+ * more we only care about the last one...
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+ */
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+ lid_device = device;
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+ }
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if (device->wakeup.flags.valid) {
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/* Button's GPE is run-wake GPE */
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