linux-kernel - [RFC PATCH v2 5/5] fbcon: Allow to get max font width and height

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Date: Mon, 26 Feb 2024 16:21:14 +0100
From: Alexey Gladkov <legion@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>
Cc: linux-api@...r.kernel.org
Subject: [RFC PATCH v2 5/5] fbcon: Allow to get max font width and height

Signed-off-by: Alexey Gladkov <legion@...nel.org>
---
 drivers/video/fbdev/core/fbcon.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 1183e7a871f8..055d0d01243c 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -101,6 +101,9 @@ enum {
 	FBCON_LOGO_DONTSHOW	= -3	/* do not show the logo */
 };
 
+#define FBCON_MAX_FONT_WIDTH 32
+#define FBCON_MAX_FONT_HEIGHT 32
+
 static struct fbcon_display fb_display[MAX_NR_CONSOLES];
 
 static struct fb_info *fbcon_registered_fb[FB_MAX];
@@ -2458,6 +2461,21 @@ static int fbcon_do_set_font(struct vc_data *vc, int w, int h, int charcount,
 	return ret;
 }
 
+
+static int fbcon_font_info(struct vc_data *vc, struct console_font_info *info)
+{
+	info->min_width = 0;
+	info->min_height = 0;
+
+	info->max_width = FBCON_MAX_FONT_WIDTH;
+	info->max_height = FBCON_MAX_FONT_HEIGHT;
+
+	info->flags = KD_FONT_INFO_FLAG_LOW_SIZE | KD_FONT_INFO_FLAG_HIGH_SIZE;
+
+	return 0;
+}
+
+
 /*
  *  User asked to set font; we are guaranteed that charcount does not exceed 512
  *  but lets not assume that, since charcount of 512 is small for unicode support.
@@ -2485,7 +2503,8 @@ static int fbcon_set_font(struct vc_data *vc, struct console_font *font,
 	    h > FBCON_SWAP(info->var.rotate, info->var.yres, info->var.xres))
 		return -EINVAL;
 
-	if (font->width > 32 || font->height > 32)
+	if (font->width > FBCON_MAX_FONT_WIDTH ||
+	    font->height > FBCON_MAX_FONT_HEIGHT)
 		return -EINVAL;
 
 	/* Make sure drawing engine can handle the font */
@@ -3160,6 +3179,7 @@ static const struct consw fb_con = {
 	.con_scroll 		= fbcon_scroll,
 	.con_switch 		= fbcon_switch,
 	.con_blank 		= fbcon_blank,
+	.con_font_info 		= fbcon_font_info,
 	.con_font_set 		= fbcon_set_font,
 	.con_font_get 		= fbcon_get_font,
 	.con_font_default	= fbcon_set_def_font,
-- 
2.44.0