linux-kernel - [RFC 22/25] leds: tm1826: Add combined glyph support

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Date:   Thu, 12 Dec 2019 04:39:49 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     linux-realtek-soc@...ts.infradead.org, linux-leds@...r.kernel.org
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andreas Färber <afaerber@...e.de>
Subject: [RFC 22/25] leds: tm1826: Add combined glyph support

Allow to squeeze the text "HEllO" into a 4-digit display,
as seen on MeLE V9 TV box.

Enable this combining mode only if the text would overflow.

Signed-off-by: Andreas Färber <afaerber@...e.de>
---
 drivers/leds/leds-tm1628.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/leds-tm1628.c b/drivers/leds/leds-tm1628.c
index e2c2a5d91596..0c0d099de8b0 100644
--- a/drivers/leds/leds-tm1628.c
+++ b/drivers/leds/leds-tm1628.c
@@ -347,6 +347,28 @@ static u8 tm1628_get_char_ssd_map(char ch)
 	return 0x0;
 }
 
+struct tm1628_ssd_glyph {
+	char *str;
+	u8 segs;
+};
+
+static const struct tm1628_ssd_glyph tm1628_glyph_ssd_map[] = {
+	{ "ll", SSD_TOP_LEFT | SSD_BOTTOM_LEFT |
+		SSD_TOP_RIGHT | SSD_BOTTOM_RIGHT },
+};
+
+static u8 tm1628_get_glyph_ssd_map(const char *str)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(tm1628_glyph_ssd_map); i++) {
+		if (!strncmp(tm1628_glyph_ssd_map[i].str, str, 2))
+			return tm1628_glyph_ssd_map[i].segs;
+	}
+
+	return 0x0;
+}
+
 static int tm1628_display_apply_map(struct tm1628 *s,
 	struct tm1628_display *display, u8 map)
 {
@@ -366,7 +388,7 @@ static ssize_t text_store(struct device *dev,
 {
 	struct tm1628 *s = dev_get_drvdata(dev);
 	size_t offset, len = count;
-	u8 map;
+	u8 map, glyph_map;
 	int i, ret;
 
 	if (len > 0 && buf[len - 1] == '\n')
@@ -375,6 +397,13 @@ static ssize_t text_store(struct device *dev,
 	for (i = 0, offset = 0; i < s->num_displays; i++) {
 		if (offset < len) {
 			map = tm1628_get_char_ssd_map(buf[offset]);
+			if (offset + 1 < len && len > s->num_displays) {
+				glyph_map = tm1628_get_glyph_ssd_map(buf + offset);
+				if (glyph_map) {
+					map = glyph_map;
+					offset++;
+				}
+			}
 			offset++;
 		} else
 			map = 0x0;
-- 
2.16.4