mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Miguel Ojeda](/assets/img/avatar_default.png)
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
178 lines
4.5 KiB
C
178 lines
4.5 KiB
C
/*
|
|
* Filename: ks0108.c
|
|
* Version: 0.1.0
|
|
* Description: ks0108 LCD Controller driver
|
|
* License: GPLv2
|
|
* Depends: parport
|
|
*
|
|
* Author: Copyright (C) Miguel Ojeda Sandonis
|
|
* Date: 2006-10-31
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/io.h>
|
|
#include <linux/parport.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/ks0108.h>
|
|
|
|
#define KS0108_NAME "ks0108"
|
|
|
|
/*
|
|
* Module Parameters
|
|
*/
|
|
|
|
static unsigned int ks0108_port = CONFIG_KS0108_PORT;
|
|
module_param(ks0108_port, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(ks0108_port, "Parallel port where the LCD is connected");
|
|
|
|
static unsigned int ks0108_delay = CONFIG_KS0108_DELAY;
|
|
module_param(ks0108_delay, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(ks0108_delay, "Delay between each control writing (microseconds)");
|
|
|
|
/*
|
|
* Device
|
|
*/
|
|
|
|
static struct parport *ks0108_parport;
|
|
static struct pardevice *ks0108_pardevice;
|
|
|
|
/*
|
|
* ks0108 Exported Commands (don't lock)
|
|
*
|
|
* You _should_ lock in the top driver: This functions _should not_
|
|
* get race conditions in any way. Locking for each byte here would be
|
|
* so slow and useless.
|
|
*
|
|
* There are not bit definitions because they are not flags,
|
|
* just arbitrary combinations defined by the documentation for each
|
|
* function in the ks0108 LCD controller. If you want to know what means
|
|
* a specific combination, look at the function's name.
|
|
*
|
|
* The ks0108_writecontrol bits need to be reverted ^(0,1,3) because
|
|
* the parallel port also revert them using a "not" logic gate.
|
|
*/
|
|
|
|
#define bit(n) (((unsigned char)1)<<(n))
|
|
|
|
void ks0108_writedata(unsigned char byte)
|
|
{
|
|
parport_write_data(ks0108_parport, byte);
|
|
}
|
|
|
|
void ks0108_writecontrol(unsigned char byte)
|
|
{
|
|
udelay(ks0108_delay);
|
|
parport_write_control(ks0108_parport, byte ^ (bit(0) | bit(1) | bit(3)));
|
|
}
|
|
|
|
void ks0108_displaystate(unsigned char state)
|
|
{
|
|
ks0108_writedata((state ? bit(0) : 0) | bit(1) | bit(2) | bit(3) | bit(4) | bit(5));
|
|
}
|
|
|
|
void ks0108_startline(unsigned char startline)
|
|
{
|
|
ks0108_writedata(min(startline,(unsigned char)63) | bit(6) | bit(7));
|
|
}
|
|
|
|
void ks0108_address(unsigned char address)
|
|
{
|
|
ks0108_writedata(min(address,(unsigned char)63) | bit(6));
|
|
}
|
|
|
|
void ks0108_page(unsigned char page)
|
|
{
|
|
ks0108_writedata(min(page,(unsigned char)7) | bit(3) | bit(4) | bit(5) | bit(7));
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ks0108_writedata);
|
|
EXPORT_SYMBOL_GPL(ks0108_writecontrol);
|
|
EXPORT_SYMBOL_GPL(ks0108_displaystate);
|
|
EXPORT_SYMBOL_GPL(ks0108_startline);
|
|
EXPORT_SYMBOL_GPL(ks0108_address);
|
|
EXPORT_SYMBOL_GPL(ks0108_page);
|
|
|
|
/*
|
|
* Is the module inited?
|
|
*/
|
|
|
|
static unsigned char ks0108_inited;
|
|
unsigned char ks0108_isinited(void)
|
|
{
|
|
return ks0108_inited;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ks0108_isinited);
|
|
|
|
/*
|
|
* Module Init & Exit
|
|
*/
|
|
|
|
static int __init ks0108_init(void)
|
|
{
|
|
int result;
|
|
int ret = -EINVAL;
|
|
|
|
ks0108_parport = parport_find_base(ks0108_port);
|
|
if (ks0108_parport == NULL) {
|
|
printk(KERN_ERR KS0108_NAME ": ERROR: "
|
|
"parport didn't find %i port\n", ks0108_port);
|
|
goto none;
|
|
}
|
|
|
|
ks0108_pardevice = parport_register_device(ks0108_parport, KS0108_NAME,
|
|
NULL, NULL, NULL, PARPORT_DEV_EXCL, NULL);
|
|
if (ks0108_pardevice == NULL) {
|
|
printk(KERN_ERR KS0108_NAME ": ERROR: "
|
|
"parport didn't register new device\n");
|
|
goto none;
|
|
}
|
|
|
|
result = parport_claim(ks0108_pardevice);
|
|
if (result != 0) {
|
|
printk(KERN_ERR KS0108_NAME ": ERROR: "
|
|
"can't claim %i parport, maybe in use\n", ks0108_port);
|
|
ret = result;
|
|
goto registered;
|
|
}
|
|
|
|
ks0108_inited = 1;
|
|
return 0;
|
|
|
|
registered:
|
|
parport_unregister_device(ks0108_pardevice);
|
|
|
|
none:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit ks0108_exit(void)
|
|
{
|
|
parport_release(ks0108_pardevice);
|
|
parport_unregister_device(ks0108_pardevice);
|
|
}
|
|
|
|
module_init(ks0108_init);
|
|
module_exit(ks0108_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>");
|
|
MODULE_DESCRIPTION("ks0108 LCD Controller driver");
|
|
|