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