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authorIlya Yanok <yanok@emcraft.com>2010-09-09 23:03:32 +0200
committerWolfgang Denk <wd@denx.de>2010-10-12 22:44:33 +0200
commit7f0d241d5ce8c7d0dff49f74498bf5708002424e (patch)
treeb387723c6e648381087103c11e9e95ee28f772a0 /drivers/misc/pdsp188x.c
parent9531a2388ccaeaabb33a359a0bbf2e1d792c7dde (diff)
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led_display: split led display support into generic and hw-dependent parts
Split the display command into generic interface and hardware-specific realization for PDSP188x LED display found on hmi1001 and manroland boards. Simple interface for LED displays is defined in include/led-display.h and described in doc/README.LED_display. Driver-specific implementation was moved into drivers/misc/pdsp188x.c file (enabled with CONFIG_PDSP188x set). Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Diffstat (limited to 'drivers/misc/pdsp188x.c')
-rw-r--r--drivers/misc/pdsp188x.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/misc/pdsp188x.c b/drivers/misc/pdsp188x.c
new file mode 100644
index 0000000..656b6ee
--- /dev/null
+++ b/drivers/misc/pdsp188x.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2010 Sergey Poselenov, Emcraft Systems, <sposelenov@emcraft.com>
+ * Copyright 2010 Ilya Yanok, Emcraft Systems, <yanok@emcraft.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <common.h>
+#include <led-display.h>
+#include <asm/io.h>
+
+#ifdef CONFIG_CMD_DISPLAY
+#define CWORD_CLEAR 0x80
+#define CLEAR_DELAY (110 * 2)
+#define DISPLAY_SIZE 8
+
+static int pos; /* Current display position */
+
+/* Handle different display commands */
+void display_set(int cmd)
+{
+ if (cmd & DISPLAY_CLEAR) {
+ out_8((unsigned char *)CONFIG_SYS_DISP_CWORD, CWORD_CLEAR);
+ udelay(1000 * CLEAR_DELAY);
+ }
+
+ if (cmd & DISPLAY_HOME) {
+ pos = 0;
+ }
+}
+
+/*
+ * Display a character at the current display position.
+ * Characters beyond the display size are ignored.
+ */
+int display_putc(char c)
+{
+ if (pos >= DISPLAY_SIZE)
+ return -1;
+
+ out_8((unsigned char *)CONFIG_SYS_DISP_CHR_RAM + pos++, c);
+
+ return c;
+}
+#endif