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Subject[PATCH v2 2/2] fbcon: add VT notifier for VT_UPDATE event
Date
This adds notifier callback for VT events. We are currently interested
in the VT_UPDATE event, which indicates there was some major change to
the VT. This is used to redraw the margins. For example when the console
is inverted we receive the VT_UPDATE event. The color of the margins depend
on the inverted state, so it is necessary redraw the margins at this time.

Signed-off-by: David Lechner <david@lechnology.com>
---
drivers/video/console/fbcon.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index 12ded23..8e7ac2f 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -3329,6 +3329,28 @@ static int fbcon_event_notify(struct notifier_block *self,
return ret;
}

+static int vt_notifier_call(struct notifier_block *blk,
+ unsigned long code, void *_param)
+{
+ struct vt_notifier_param *param = _param;
+ struct vc_data *vc = param->vc;
+
+ switch (code) {
+ case VT_UPDATE:
+ /*
+ * This event could indicate that the terminal has been
+ * inverted (or there was some other major change), in which
+ * case we need to re-draw the margins.
+ */
+ if (con_is_visible(vc) && vc->vc_mode == KD_TEXT)
+ fbcon_clear_margins(vc, 0);
+ break;
+ default:
+ break;
+ }
+ return NOTIFY_OK;
+}
+
/*
* The console `switch' structure for the frame buffer based console
*/
@@ -3364,6 +3386,10 @@ static struct notifier_block fbcon_event_notifier = {
.notifier_call = fbcon_event_notify,
};

+static struct notifier_block vt_notifier_block = {
+ .notifier_call = vt_notifier_call,
+};
+
static ssize_t store_rotate(struct device *device,
struct device_attribute *attr, const char *buf,
size_t count)
@@ -3612,6 +3638,7 @@ static int __init fb_console_init(void)

console_lock();
fb_register_client(&fbcon_event_notifier);
+ register_vt_notifier(&vt_notifier_block);
fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), NULL,
"fbcon");

@@ -3650,6 +3677,7 @@ static void __exit fbcon_deinit_device(void)
static void __exit fb_console_exit(void)
{
console_lock();
+ unregister_vt_notifier(&vt_notifier_block);
fb_unregister_client(&fbcon_event_notifier);
fbcon_deinit_device();
device_destroy(fb_class, MKDEV(0, 0));
--
2.7.4
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