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| Current File : //compat/linux/proc/self/root/usr/src/sys/arm/xscale/i80321/iq31244_7seg.c |
/* $NetBSD: iq31244_7seg.c,v 1.2 2003/07/15 00:25:01 lukem Exp $ */
/*-
* Copyright (c) 2001, 2002, 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Support for the 7-segment display on the Intel IQ31244.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/arm/xscale/i80321/iq31244_7seg.c 146618 2005-05-25 13:44:55Z cognet $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/sysctl.h>
#include <machine/bus.h>
#include <arm/xscale/i80321/iq80321reg.h>
#include <arm/xscale/i80321/iq80321var.h>
#define WRITE(x, v) *((__volatile uint8_t *) (x)) = (v)
static int snakestate;
/*
* The 7-segment display looks like so:
*
* A
* +-----+
* | |
* F | | B
* | G |
* +-----+
* | |
* E | | C
* | D |
* +-----+ o DP
*
* Setting a bit clears the corresponding segment on the
* display.
*/
#define SEG_A (1 << 0)
#define SEG_B (1 << 1)
#define SEG_C (1 << 2)
#define SEG_D (1 << 3)
#define SEG_E (1 << 4)
#define SEG_F (1 << 5)
#define SEG_G (1 << 6)
#define SEG_DP (1 << 7)
static const uint8_t digitmap[] = {
/* +#####+
* # #
* # #
* # #
* +-----+
* # #
* # #
* # #
* +#####+
*/
SEG_G,
/* +-----+
* | #
* | #
* | #
* +-----+
* | #
* | #
* | #
* +-----+
*/
SEG_A|SEG_D|SEG_E|SEG_F|SEG_G,
/* +#####+
* | #
* | #
* | #
* +#####+
* # |
* # |
* # |
* +#####+
*/
SEG_C|SEG_F,
/* +#####+
* | #
* | #
* | #
* +#####+
* | #
* | #
* | #
* +#####+
*/
SEG_E|SEG_F,
/* +-----+
* # #
* # #
* # #
* +#####+
* | #
* | #
* | #
* +-----+
*/
SEG_A|SEG_D|SEG_E,
/* +#####+
* # |
* # |
* # |
* +#####+
* | #
* | #
* | #
* +#####+
*/
SEG_B|SEG_E,
/* +#####+
* # |
* # |
* # |
* +#####+
* # #
* # #
* # #
* +#####+
*/
SEG_B,
/* +#####+
* | #
* | #
* | #
* +-----+
* | #
* | #
* | #
* +-----+
*/
SEG_D|SEG_E|SEG_F,
/* +#####+
* # #
* # #
* # #
* +#####+
* # #
* # #
* # #
* +#####+
*/
0,
/* +#####+
* # #
* # #
* # #
* +#####+
* | #
* | #
* | #
* +-----+
*/
SEG_D|SEG_E,
};
static uint8_t
iq80321_7seg_xlate(char c)
{
uint8_t rv;
if (c >= '0' && c <= '9')
rv = digitmap[c - '0'];
else if (c == '.')
rv = (uint8_t) ~SEG_DP;
else
rv = 0xff;
return (rv);
}
void
iq80321_7seg(char a, char b)
{
uint8_t msb, lsb;
msb = iq80321_7seg_xlate(a);
lsb = iq80321_7seg_xlate(b);
snakestate = 0;
WRITE(IQ80321_7SEG_MSB, msb);
WRITE(IQ80321_7SEG_LSB, lsb);
}
static const uint8_t snakemap[][2] = {
/* +#####+ +#####+
* | | | |
* | | | |
* | | | |
* +-----+ +-----+
* | | | |
* | | | |
* | | | |
* +-----+ +-----+
*/
{ ~SEG_A, ~SEG_A },
/* +-----+ +-----+
* # | | #
* # | | #
* # | | #
* +-----+ +-----+
* | | | |
* | | | |
* | | | |
* +-----+ +-----+
*/
{ ~SEG_F, ~SEG_B },
/* +-----+ +-----+
* | | | |
* | | | |
* | | | |
* +#####+ +#####+
* | | | |
* | | | |
* | | | |
* +-----+ +-----+
*/
{ ~SEG_G, ~SEG_G },
/* +-----+ +-----+
* | | | |
* | | | |
* | | | |
* +-----+ +-----+
* | # # |
* | # # |
* | # # |
* +-----+ +-----+
*/
{ ~SEG_C, ~SEG_E },
/* +-----+ +-----+
* | | | |
* | | | |
* | | | |
* +-----+ +-----+
* | | | |
* | | | |
* | | | |
* +#####+ +#####+
*/
{ ~SEG_D, ~SEG_D },
/* +-----+ +-----+
* | | | |
* | | | |
* | | | |
* +-----+ +-----+
* # | | #
* # | | #
* # | | #
* +-----+ +-----+
*/
{ ~SEG_E, ~SEG_C },
/* +-----+ +-----+
* | | | |
* | | | |
* | | | |
* +#####+ +#####+
* | | | |
* | | | |
* | | | |
* +-----+ +-----+
*/
{ ~SEG_G, ~SEG_G },
/* +-----+ +-----+
* | # # |
* | # # |
* | # # |
* +-----+ +-----+
* | | | |
* | | | |
* | | | |
* +-----+ +-----+
*/
{ ~SEG_B, ~SEG_F },
};
SYSCTL_NODE(_hw, OID_AUTO, sevenseg, CTLFLAG_RD, 0, "7 seg");
static int freq = 20;
SYSCTL_INT(_hw_sevenseg, OID_AUTO, freq, CTLFLAG_RW, &freq, 0,
"7 Seg update frequency");
static void
iq31244_7seg_snake(void)
{
static int snakefreq;
int cur = snakestate;
snakefreq++;
if ((snakefreq % freq))
return;
WRITE(IQ80321_7SEG_MSB, snakemap[cur][0]);
WRITE(IQ80321_7SEG_LSB, snakemap[cur][1]);
snakestate = (cur + 1) & 7;
}
struct iq31244_7seg_softc {
device_t dev;
};
static int
iq31244_7seg_probe(device_t dev)
{
device_set_desc(dev, "IQ31244 7seg");
return (0);
}
extern void (*i80321_hardclock_hook)(void);
static int
iq31244_7seg_attach(device_t dev)
{
i80321_hardclock_hook = iq31244_7seg_snake;
return (0);
}
static device_method_t iq31244_7seg_methods[] = {
DEVMETHOD(device_probe, iq31244_7seg_probe),
DEVMETHOD(device_attach, iq31244_7seg_attach),
{0, 0},
};
static driver_t iq31244_7seg_driver = {
"iqseg",
iq31244_7seg_methods,
sizeof(struct iq31244_7seg_softc),
};
static devclass_t iq31244_7seg_devclass;
DRIVER_MODULE(iqseg, iq, iq31244_7seg_driver, iq31244_7seg_devclass, 0, 0);