diff options
| author | Ilya Yanok <yanok@emcraft.com> | 2010-09-09 23:03:32 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2010-10-12 22:44:33 +0200 |
| commit | 7f0d241d5ce8c7d0dff49f74498bf5708002424e (patch) | |
| tree | b387723c6e648381087103c11e9e95ee28f772a0 /drivers/misc/pdsp188x.c | |
| parent | 9531a2388ccaeaabb33a359a0bbf2e1d792c7dde (diff) | |
| download | u-boot-imx-7f0d241d5ce8c7d0dff49f74498bf5708002424e.zip u-boot-imx-7f0d241d5ce8c7d0dff49f74498bf5708002424e.tar.gz u-boot-imx-7f0d241d5ce8c7d0dff49f74498bf5708002424e.tar.bz2 | |
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.c | 57 |
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 |