mirror of
https://github.com/torvalds/linux.git
synced 2024-11-08 21:21:47 +00:00
514 lines
9.6 KiB
C
514 lines
9.6 KiB
C
/*
|
|
* LCD, LED and Button interface for Cobalt
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1996, 1997 by Andrew Bose
|
|
*
|
|
* Linux kernel version history:
|
|
* March 2001: Ported from 2.0.34 by Liam Davies
|
|
*
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/mc146818rtc.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/system.h>
|
|
|
|
#include "lcd.h"
|
|
|
|
static int lcd_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg);
|
|
|
|
static unsigned int lcd_present = 1;
|
|
|
|
/* used in arch/mips/cobalt/reset.c */
|
|
int led_state = 0;
|
|
|
|
#if defined(CONFIG_TULIP) && 0
|
|
|
|
#define MAX_INTERFACES 8
|
|
static linkcheck_func_t linkcheck_callbacks[MAX_INTERFACES];
|
|
static void *linkcheck_cookies[MAX_INTERFACES];
|
|
|
|
int lcd_register_linkcheck_func(int iface_num, void *func, void *cookie)
|
|
{
|
|
if (iface_num < 0 ||
|
|
iface_num >= MAX_INTERFACES ||
|
|
linkcheck_callbacks[iface_num] != NULL)
|
|
return -1;
|
|
linkcheck_callbacks[iface_num] = (linkcheck_func_t) func;
|
|
linkcheck_cookies[iface_num] = cookie;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int lcd_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct lcd_display button_display;
|
|
unsigned long address, a;
|
|
|
|
switch (cmd) {
|
|
case LCD_On:
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x0F);
|
|
break;
|
|
|
|
case LCD_Off:
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x08);
|
|
break;
|
|
|
|
case LCD_Reset:
|
|
udelay(150);
|
|
LCDWriteInst(0x3F);
|
|
udelay(150);
|
|
LCDWriteInst(0x3F);
|
|
udelay(150);
|
|
LCDWriteInst(0x3F);
|
|
udelay(150);
|
|
LCDWriteInst(0x3F);
|
|
udelay(150);
|
|
LCDWriteInst(0x01);
|
|
udelay(150);
|
|
LCDWriteInst(0x06);
|
|
break;
|
|
|
|
case LCD_Clear:
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x01);
|
|
break;
|
|
|
|
case LCD_Cursor_Left:
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x10);
|
|
break;
|
|
|
|
case LCD_Cursor_Right:
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x14);
|
|
break;
|
|
|
|
case LCD_Cursor_Off:
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x0C);
|
|
break;
|
|
|
|
case LCD_Cursor_On:
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x0F);
|
|
break;
|
|
|
|
case LCD_Blink_Off:
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x0E);
|
|
break;
|
|
|
|
case LCD_Get_Cursor_Pos:{
|
|
struct lcd_display display;
|
|
|
|
udelay(150);
|
|
BusyCheck();
|
|
display.cursor_address = (LCDReadInst);
|
|
display.cursor_address =
|
|
(display.cursor_address & 0x07F);
|
|
if (copy_to_user
|
|
((struct lcd_display *) arg, &display,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
|
|
break;
|
|
}
|
|
|
|
|
|
case LCD_Set_Cursor_Pos:{
|
|
struct lcd_display display;
|
|
|
|
if (copy_from_user
|
|
(&display, (struct lcd_display *) arg,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
|
|
a = (display.cursor_address | kLCD_Addr);
|
|
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(a);
|
|
|
|
break;
|
|
}
|
|
|
|
case LCD_Get_Cursor:{
|
|
struct lcd_display display;
|
|
|
|
udelay(150);
|
|
BusyCheck();
|
|
display.character = LCDReadData;
|
|
|
|
if (copy_to_user
|
|
((struct lcd_display *) arg, &display,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x10);
|
|
|
|
break;
|
|
}
|
|
|
|
case LCD_Set_Cursor:{
|
|
struct lcd_display display;
|
|
|
|
if (copy_from_user
|
|
(&display, (struct lcd_display *) arg,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteData(display.character);
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x10);
|
|
|
|
break;
|
|
}
|
|
|
|
|
|
case LCD_Disp_Left:
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x18);
|
|
break;
|
|
|
|
case LCD_Disp_Right:
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x1C);
|
|
break;
|
|
|
|
case LCD_Home:
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x02);
|
|
break;
|
|
|
|
case LCD_Write:{
|
|
struct lcd_display display;
|
|
unsigned int index;
|
|
|
|
|
|
if (copy_from_user
|
|
(&display, (struct lcd_display *) arg,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0x80);
|
|
udelay(150);
|
|
BusyCheck();
|
|
|
|
for (index = 0; index < (display.size1); index++) {
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteData(display.line1[index]);
|
|
BusyCheck();
|
|
}
|
|
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(0xC0);
|
|
udelay(150);
|
|
BusyCheck();
|
|
for (index = 0; index < (display.size2); index++) {
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteData(display.line2[index]);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case LCD_Read:{
|
|
struct lcd_display display;
|
|
|
|
BusyCheck();
|
|
for (address = kDD_R00; address <= kDD_R01;
|
|
address++) {
|
|
a = (address | kLCD_Addr);
|
|
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(a);
|
|
udelay(150);
|
|
BusyCheck();
|
|
display.line1[address] = LCDReadData;
|
|
}
|
|
|
|
display.line1[0x27] = '\0';
|
|
|
|
for (address = kDD_R10; address <= kDD_R11;
|
|
address++) {
|
|
a = (address | kLCD_Addr);
|
|
|
|
udelay(150);
|
|
BusyCheck();
|
|
LCDWriteInst(a);
|
|
|
|
udelay(150);
|
|
BusyCheck();
|
|
display.line2[address - 0x40] =
|
|
LCDReadData;
|
|
}
|
|
|
|
display.line2[0x27] = '\0';
|
|
|
|
if (copy_to_user
|
|
((struct lcd_display *) arg, &display,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
break;
|
|
}
|
|
|
|
// set all GPIO leds to led_display.leds
|
|
|
|
case LED_Set:{
|
|
struct lcd_display led_display;
|
|
|
|
|
|
if (copy_from_user
|
|
(&led_display, (struct lcd_display *) arg,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
|
|
led_state = led_display.leds;
|
|
LEDSet(led_state);
|
|
|
|
break;
|
|
}
|
|
|
|
|
|
// set only bit led_display.leds
|
|
|
|
case LED_Bit_Set:{
|
|
unsigned int i;
|
|
int bit = 1;
|
|
struct lcd_display led_display;
|
|
|
|
|
|
if (copy_from_user
|
|
(&led_display, (struct lcd_display *) arg,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
|
|
for (i = 0; i < (int) led_display.leds; i++) {
|
|
bit = 2 * bit;
|
|
}
|
|
|
|
led_state = led_state | bit;
|
|
LEDSet(led_state);
|
|
break;
|
|
}
|
|
|
|
// clear only bit led_display.leds
|
|
|
|
case LED_Bit_Clear:{
|
|
unsigned int i;
|
|
int bit = 1;
|
|
struct lcd_display led_display;
|
|
|
|
|
|
if (copy_from_user
|
|
(&led_display, (struct lcd_display *) arg,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
|
|
for (i = 0; i < (int) led_display.leds; i++) {
|
|
bit = 2 * bit;
|
|
}
|
|
|
|
led_state = led_state & ~bit;
|
|
LEDSet(led_state);
|
|
break;
|
|
}
|
|
|
|
|
|
case BUTTON_Read:{
|
|
button_display.buttons = GPIRead;
|
|
if (copy_to_user
|
|
((struct lcd_display *) arg, &button_display,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
break;
|
|
}
|
|
|
|
case LINK_Check:{
|
|
button_display.buttons =
|
|
*((volatile unsigned long *) (0xB0100060));
|
|
if (copy_to_user
|
|
((struct lcd_display *) arg, &button_display,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
break;
|
|
}
|
|
|
|
case LINK_Check_2:{
|
|
int iface_num;
|
|
|
|
/* panel-utils should pass in the desired interface status is wanted for
|
|
* in "buttons" of the structure. We will set this to non-zero if the
|
|
* link is in fact up for the requested interface. --DaveM
|
|
*/
|
|
if (copy_from_user
|
|
(&button_display, (struct lcd_display *) arg,
|
|
sizeof(button_display)))
|
|
return -EFAULT;
|
|
iface_num = button_display.buttons;
|
|
#if defined(CONFIG_TULIP) && 0
|
|
if (iface_num >= 0 &&
|
|
iface_num < MAX_INTERFACES &&
|
|
linkcheck_callbacks[iface_num] != NULL) {
|
|
button_display.buttons =
|
|
linkcheck_callbacks[iface_num]
|
|
(linkcheck_cookies[iface_num]);
|
|
} else
|
|
#endif
|
|
button_display.buttons = 0;
|
|
|
|
if (__copy_to_user
|
|
((struct lcd_display *) arg, &button_display,
|
|
sizeof(struct lcd_display)))
|
|
return -EFAULT;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int lcd_open(struct inode *inode, struct file *file)
|
|
{
|
|
if (!lcd_present)
|
|
return -ENXIO;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* Only RESET or NEXT counts as button pressed */
|
|
|
|
static inline int button_pressed(void)
|
|
{
|
|
unsigned long buttons = GPIRead;
|
|
|
|
if ((buttons == BUTTON_Next) || (buttons == BUTTON_Next_B)
|
|
|| (buttons == BUTTON_Reset_B))
|
|
return buttons;
|
|
return 0;
|
|
}
|
|
|
|
/* LED daemon sits on this and we wake him up once a key is pressed. */
|
|
|
|
static int lcd_waiters = 0;
|
|
|
|
static ssize_t lcd_read(struct file *file, char *buf,
|
|
size_t count, loff_t *ofs)
|
|
{
|
|
long buttons_now;
|
|
|
|
if (lcd_waiters > 0)
|
|
return -EINVAL;
|
|
|
|
lcd_waiters++;
|
|
while (((buttons_now = (long) button_pressed()) == 0) &&
|
|
!(signal_pending(current))) {
|
|
msleep_interruptible(2000);
|
|
}
|
|
lcd_waiters--;
|
|
|
|
if (signal_pending(current))
|
|
return -ERESTARTSYS;
|
|
return buttons_now;
|
|
}
|
|
|
|
/*
|
|
* The various file operations we support.
|
|
*/
|
|
|
|
static const struct file_operations lcd_fops = {
|
|
.read = lcd_read,
|
|
.ioctl = lcd_ioctl,
|
|
.open = lcd_open,
|
|
};
|
|
|
|
static struct miscdevice lcd_dev = {
|
|
MISC_DYNAMIC_MINOR,
|
|
"lcd",
|
|
&lcd_fops
|
|
};
|
|
|
|
static int lcd_init(void)
|
|
{
|
|
int ret;
|
|
unsigned long data;
|
|
|
|
pr_info("%s\n", LCD_DRIVER);
|
|
ret = misc_register(&lcd_dev);
|
|
if (ret) {
|
|
printk(KERN_WARNING LCD "Unable to register misc device.\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Check region? Naaah! Just snarf it up. */
|
|
/* request_region(RTC_PORT(0), RTC_IO_EXTENT, "lcd");*/
|
|
|
|
udelay(150);
|
|
data = LCDReadData;
|
|
if ((data & 0x000000FF) == (0x00)) {
|
|
lcd_present = 0;
|
|
pr_info(LCD "LCD Not Present\n");
|
|
} else {
|
|
lcd_present = 1;
|
|
WRITE_GAL(kGal_DevBank2PReg, kGal_DevBank2Cfg);
|
|
WRITE_GAL(kGal_DevBank3PReg, kGal_DevBank3Cfg);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit lcd_exit(void)
|
|
{
|
|
misc_deregister(&lcd_dev);
|
|
}
|
|
|
|
module_init(lcd_init);
|
|
module_exit(lcd_exit);
|
|
|
|
MODULE_AUTHOR("Andrew Bose");
|
|
MODULE_LICENSE("GPL");
|