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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [briq_panel.c] - Blame information for rev 1765

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Line No. Rev Author Line
1 1275 phoenix 
/*
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 * Drivers for the Total Impact PPC based computer "BRIQ"
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 * by Dr. Karsten Jeppesen
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 *
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 *
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 * 010407               Coding started
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 *
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 * 04/20/2002   1.1     Adapted to 2.4, small cleanups
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 */
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/tty.h>
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#include <linux/timer.h>
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/wait.h>
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#include <linux/string.h>
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#include <linux/malloc.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/miscdevice.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#define         TOTALIMPACT_VFD_MINOR   156
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#define         VFD_IOPORT              0x0390
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#define         LED_IOPORT              0x0398
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#define         TI_VER                  "1.1 (04/20/2002)"
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#define         TI_MSG0                 "Loading Linux"
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static int              vfd_is_open;
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static unsigned char    vfd[40];
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static int              vfd_cursor;
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static unsigned char    ledpb, led;
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static void UpdateVFD( void )
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{
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        int     i;
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        outb(0x02, VFD_IOPORT); /* cursor home */
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        for (i=0; i<20; i++) outb(vfd[i], VFD_IOPORT + 1);
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        outb(0xc0, VFD_IOPORT); /* cursor to next line */
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        for (i=20; i<40; i++) outb(vfd[i], VFD_IOPORT + 1);
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}
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static void SetLED( char state)
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{
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        if ( state == 'R' ) led = 0x01;
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        else if ( state == 'G' ) led = 0x02;
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        else if ( state == 'Y' ) led = 0x03;
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        else if ( state == 'X' ) led = 0x00;
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        outb(led, LED_IOPORT);
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}
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static int do_open(struct inode *ino, struct file *filep)
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{
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        if (vfd_is_open) return -EBUSY;
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        MOD_INC_USE_COUNT;
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        vfd_is_open = 1;
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        return(0);
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}
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static int do_release(struct inode *ino, struct file *filep)
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{
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        if (!vfd_is_open) return -ENODEV;
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        MOD_DEC_USE_COUNT;
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        vfd_is_open = 0;
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        return(0);
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}
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static ssize_t do_read(struct file *file, char *buf, size_t count,
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                         loff_t *ppos)
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{
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        unsigned short c;
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        unsigned char cp;
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        /*  Can't seek (pread) on this device  */
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        if (ppos != &file->f_pos) return -ESPIPE;
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        if (!vfd_is_open) return -ENODEV;
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        c = (inb( LED_IOPORT ) & 0x000c) | (ledpb & 0x0003);
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        SetLED(' ');
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        if ((!(ledpb & 0x0004)) && (c & 0x0004))
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        {       /* upper button released */
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                cp = ' ';
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                ledpb = c;
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                if (copy_to_user(buf, &cp, 1)) return -EFAULT;
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                return(1);
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        }
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        else if ((!(ledpb & 0x0008)) && (c & 0x0008))
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        {       /* lower button released */
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                cp = '\r';
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                ledpb = c;
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                if (copy_to_user(buf, &cp, 1)) return -EFAULT;
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                return(1);
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        } else
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        {
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                ledpb = c;
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                return(0);
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        }
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}
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static void ScrollVFD( void )
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{
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        int     i;
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        for (i=0; i<20; i++)
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        {
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                vfd[i] = vfd[i+20];
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                vfd[i+20] = ' ';
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        }
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        vfd_cursor = 20;
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}
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static ssize_t do_write(struct file *file, const char *buf, size_t len,
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                          loff_t *ppos)
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{
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        size_t          indx = len;
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        int             i, esc=0;
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        /*  Can't seek (pwrite) on this device  */
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        if (ppos != &file->f_pos) return -ESPIPE;
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        if (!vfd_is_open) return -EBUSY;
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        for (;;)
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        {
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                if (!indx) break;
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                if (esc)
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                {
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                        SetLED(*buf);
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                        esc = 0;
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                }
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                else if (*buf == 27)
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                {
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                        esc = 1;
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                }
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                else if (*buf == 12)
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                { /* do a form feed */
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                        for (i=0; i<40; i++) vfd[i] = ' ';
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                        vfd_cursor = 0;
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                }
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                else if (*buf == 10)
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                {
152 
                        if (vfd_cursor < 20) vfd_cursor = 20;
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                        else if (vfd_cursor < 40) vfd_cursor = 40;
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                        else if (vfd_cursor < 60) vfd_cursor = 60;
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                        if (vfd_cursor > 59) ScrollVFD();
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                }
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                else
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                {
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                        /* just a character */
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                        if (vfd_cursor > 39) ScrollVFD();
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                        vfd[vfd_cursor++] = *buf;
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                }
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                indx--;
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                buf++;
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        }
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        UpdateVFD();
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        return len;
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}
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static struct file_operations vfd_fops = {
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        read:           do_read,        /* Read */
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        write:          do_write,       /* Write */
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        open:           do_open,        /* Open */
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        release:        do_release,     /* Release */
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};
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static struct miscdevice ti_vfd_miscdev = {
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        TOTALIMPACT_VFD_MINOR,
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        "vfd",
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        &vfd_fops
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};
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185 
 
186 
static int __init briq_panel_init(void)
187 
{
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        struct device_node *root = find_path_device("/");
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        char *machine;
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        int i;
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192 
        machine = get_property(root, "model", NULL);
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        if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0)
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                return -ENODEV;
195 
 
196 
        printk(KERN_INFO "ti_briq: v%s Dr. Karsten Jeppesen (kj@totalimpact.com)\n", TI_VER);
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198 
        if (!request_region( VFD_IOPORT, 4, "BRIQ Front Panel"))
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                return -EBUSY;
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        if (!request_region( LED_IOPORT, 2, "BRIQ Front Panel")) {
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                release_region(VFD_IOPORT, 4);
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                return -EBUSY;
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        }
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        ledpb = inb( LED_IOPORT ) & 0x000c;
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206 
        if (misc_register(&ti_vfd_miscdev) < 0) {
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                release_region(VFD_IOPORT, 4);
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                release_region(LED_IOPORT, 2);
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                return -EBUSY;
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        }
211 
 
212 
        outb(0x38, VFD_IOPORT); /* Function set */
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        outb(0x01, VFD_IOPORT); /* Clear display */
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        outb(0x0c, VFD_IOPORT); /* Display on */
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        outb(0x06, VFD_IOPORT); /* Entry normal */
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        for (i=0; i<40; i++) vfd[i]=' ';
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#ifndef MODULE
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        vfd[0] = 'L';
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        vfd[1] = 'o';
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        vfd[2] = 'a';
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        vfd[3] = 'd';
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        vfd[4] = 'i';
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        vfd[5] = 'n';
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        vfd[6] = 'g';
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        vfd[7] = ' ';
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        vfd[8] = '.';
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        vfd[9] = '.';
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        vfd[10] = '.';
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#endif /* !MODULE */
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        UpdateVFD();
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232 
        return 0;
233 
}
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235 
 
236 
static void __exit briq_panel_exit(void)
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{
238 
        misc_deregister(&ti_vfd_miscdev);
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        release_region(VFD_IOPORT, 4);
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        release_region(LED_IOPORT, 2);
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}
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244 
module_init(briq_panel_init);
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module_exit(briq_panel_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Karsten Jeppesen <karsten@jeppesens.com>");
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MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");
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EXPORT_NO_SYMBOLS;

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