ACPI button: provide lid status functions

Some drivers need to know when a lid event occurs and get the current
status.  This can be useful for when a platform firmware clobbers some
hardware state at lid time, and a driver needs to restore things when
the lid is opened again.

Acked-by: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 9195deba9d945b1ca92d0523ee5053666b8e6c49..ebb593e9c3803bf2b7fbcdfe6fdc15411005818f 100644 (file)
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -113,6 +113,9 @@ static const struct file_operations acpi_button_state_fops = {
        .release = single_release,
 };
 
+static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
+static struct acpi_device *lid_device;
+
 /* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */
@@ -229,11 +232,38 @@ static int acpi_button_remove_fs(struct acpi_device *device)
 /* --------------------------------------------------------------------------
                                 Driver Interface
    -------------------------------------------------------------------------- */
+int acpi_lid_notifier_register(struct notifier_block *nb)
+{
+       return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
+}
+EXPORT_SYMBOL(acpi_lid_notifier_register);
+
+int acpi_lid_notifier_unregister(struct notifier_block *nb)
+{
+       return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
+}
+EXPORT_SYMBOL(acpi_lid_notifier_unregister);
+
+int acpi_lid_open(void)
+{
+       acpi_status status;
+       unsigned long long state;
+
+       status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
+                                      &state);
+       if (ACPI_FAILURE(status))
+               return -ENODEV;
+
+       return !!state;
+}
+EXPORT_SYMBOL(acpi_lid_open);
+
 static int acpi_lid_send_state(struct acpi_device *device)
 {
        struct acpi_button *button = acpi_driver_data(device);
        unsigned long long state;
        acpi_status status;
+       int ret;
 
        status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
        if (ACPI_FAILURE(status))
@@ -242,7 +272,12 @@ static int acpi_lid_send_state(struct acpi_device *device)
        /* input layer checks if event is redundant */
        input_report_switch(button->input, SW_LID, !state);
        input_sync(button->input);
-       return 0;
+
+       ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
+       if (ret == NOTIFY_DONE)
+               ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
+                                                  device);
+       return ret;
 }
 
 static void acpi_button_notify(struct acpi_device *device, u32 event)
@@ -364,8 +399,14 @@ static int acpi_button_add(struct acpi_device *device)
        error = input_register_device(input);
        if (error)
                goto err_remove_fs;
-       if (button->type == ACPI_BUTTON_TYPE_LID)
+       if (button->type == ACPI_BUTTON_TYPE_LID) {
                acpi_lid_send_state(device);
+               /*
+                * This assumes there's only one lid device, or if there are
+                * more we only care about the last one...
+                */
+               lid_device = device;
+       }
 
        if (device->wakeup.flags.valid) {
                /* Button's GPE is run-wake GPE */

diff --git a/include/acpi/button.h b/include/acpi/button.h
new file mode 100644 (file)
index 0000000..bb643a7
--- /dev/null
+++ b/include/acpi/button.h
@@ -0,0 +1,10 @@
+#ifndef ACPI_BUTTON_H
+#define ACPI_BUTTON_H
+
+#include <linux/notifier.h>
+
+extern int acpi_lid_notifier_register(struct notifier_block *nb);
+extern int acpi_lid_notifier_unregister(struct notifier_block *nb);
+extern int acpi_lid_open(void);
+
+#endif /* ACPI_BUTTON_H */