linux-kernel - [RFC PATCH v2 4/5] vgacon: Allow to get max font width and height

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Message-ID: <6e8da86c7c8aa955158e8fec048a2c89cba4b592.1708960303.git.legion@kernel.org>
Date: Mon, 26 Feb 2024 16:21:13 +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 4/5] vgacon: Allow to get max font width and height

Signed-off-by: Alexey Gladkov <legion@...nel.org>
---
 drivers/video/console/vgacon.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index 8ef1579fa57f..b75d31ef3353 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -61,6 +61,10 @@ static struct vgastate vgastate;
 #define BLANK 0x0020
 
 #define VGA_FONTWIDTH       8   /* VGA does not support fontwidths != 8 */
+
+#define VGACON_MAX_FONT_WIDTH VGA_FONTWIDTH
+#define VGACON_MAX_FONT_HEIGHT 32
+
 /*
  *  Interface used by the world
  */
@@ -1013,6 +1017,19 @@ static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight)
 	return 0;
 }
 
+static int vgacon_font_info(struct vc_data *vc, struct console_font_info *info)
+{
+	info->min_width = VGACON_MAX_FONT_WIDTH;
+	info->min_height = 0;
+
+	info->max_width = VGACON_MAX_FONT_WIDTH;
+	info->max_height = VGACON_MAX_FONT_HEIGHT;
+
+	info->flags = KD_FONT_INFO_FLAG_LOW_SIZE | KD_FONT_INFO_FLAG_HIGH_SIZE;
+
+	return 0;
+}
+
 static int vgacon_font_set(struct vc_data *c, struct console_font *font,
 			   unsigned int vpitch, unsigned int flags)
 {
@@ -1022,7 +1039,8 @@ static int vgacon_font_set(struct vc_data *c, struct console_font *font,
 	if (vga_video_type < VIDEO_TYPE_EGAM)
 		return -EINVAL;
 
-	if (font->width != VGA_FONTWIDTH || font->height > 32 || vpitch != 32 ||
+	if (font->width != VGACON_MAX_FONT_WIDTH ||
+	    font->height > VGACON_MAX_FONT_HEIGHT || vpitch != 32 ||
 	    (charcount != 256 && charcount != 512))
 		return -EINVAL;
 
@@ -1177,6 +1195,7 @@ const struct consw vga_con = {
 	.con_scroll = vgacon_scroll,
 	.con_switch = vgacon_switch,
 	.con_blank = vgacon_blank,
+	.con_font_info = vgacon_font_info,
 	.con_font_set = vgacon_font_set,
 	.con_font_get = vgacon_font_get,
 	.con_resize = vgacon_resize,
-- 
2.44.0