[PATCH v4 2/2] fbcon: expose cursor blink interval via sysfs

[Scot Doyle <lkml14@scotdoyle.com>]

fbcon toggles cursor display state every 200 milliseconds when blinking.
Since users prefer different toggle intervals, expose the interval via
/sys/class/graphics/fbcon/cursor_blink_ms so that it may be customized.

Values written to the interface set the approximate time interval in
milliseconds between cursor toggles, from 1 to 32767. Since the interval
is stored internally as a number of jiffies, the millisecond value read
from the interface may not exactly match the entered value.

An outstanding blink timer is reset after a new value is entered.

If the cursor blink is disabled, either via the 'cursor_blink' boolean
setting or some other mechanism, the 'cursor_blink_ms' setting may still
be modified. The new value will be used if the blink is reactivated.

Signed-off-by: Scot Doyle <lkml14@scotdoyle.com>
---
 drivers/video/console/fbcon.c | 79 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index 7a2030b..19620d2 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -3495,11 +3495,90 @@ err:
 	return count;
 }
 
+static ssize_t show_cursor_blink_ms(struct device *device,
+				    struct device_attribute *attr, char *buf)
+{
+	struct fb_info *info;
+	struct fbcon_ops *ops;
+	int idx, ms = -1;
+
+	if (fbcon_has_exited) {
+		pr_err("%s: framebuffer console exited", __func__);
+		return 0;
+	}
+
+	console_lock();
+	idx = con2fb_map[fg_console];
+
+	if (idx == -1 || registered_fb[idx] == NULL) {
+		pr_err("%s: no console to framebuffer mapping", __func__);
+		goto err;
+	}
+
+	info = registered_fb[idx];
+
+	if ((ops = info->fbcon_par) == NULL) {
+		pr_err("%s: framebuffer has no device info", __func__);
+		goto err;
+	}
+
+	ms = jiffies_to_msecs(ops->blink_jiffies);
+
+err:
+	console_unlock();
+	return snprintf(buf, PAGE_SIZE, "%d\n", ms);
+}
+
+static ssize_t store_cursor_blink_ms(struct device *device,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct fb_info *info;
+	struct fbcon_ops *ops;
+	int idx;
+	short ms;
+
+	if (fbcon_has_exited) {
+		pr_err("%s: framebuffer console exited", __func__);
+		return count;
+	}
+
+	console_lock();
+	idx = con2fb_map[fg_console];
+
+	if (idx == -1 || registered_fb[idx] == NULL) {
+		pr_err("%s: no console to framebuffer mapping", __func__);
+		goto err;
+	}
+
+	info = registered_fb[idx];
+
+	if ((ops = info->fbcon_par) == NULL) {
+		pr_err("%s: framebuffer has no device info", __func__);
+		goto err;
+	}
+
+	if (!kstrtos16(buf, 0, &ms)) {
+		ops->blink_jiffies = max_t(int, msecs_to_jiffies(ms), 1);
+		if (info->queue.func == fb_flashcursor &&
+		    ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
+			fbcon_del_cursor_timer(info);
+			fbcon_add_cursor_timer(info);
+		}
+	}
+
+err:
+	console_unlock();
+	return count;
+}
+
 static struct device_attribute device_attrs[] = {
 	__ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
 	__ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
 	__ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
 	       store_cursor_blink),
+	__ATTR(cursor_blink_ms, S_IRUGO|S_IWUSR, show_cursor_blink_ms,
+	       store_cursor_blink_ms),
 };
 
 static int fbcon_init_device(void)
-- 
2.1.4