Logo Search packages:      
Sourcecode: linux version File versions  Download package

briq_panel.c

/*
 * Drivers for the Total Impact PPC based computer "BRIQ"
 * by Dr. Karsten Jeppesen
 *
 */

#include <linux/module.h>

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/timer.h>
#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/init.h>

#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/prom.h>

#define           BRIQ_PANEL_MINOR  156
#define           BRIQ_PANEL_VFD_IOPORT   0x0390
#define           BRIQ_PANEL_LED_IOPORT   0x0398
#define           BRIQ_PANEL_VER          "1.1 (04/20/2002)"
#define           BRIQ_PANEL_MSG0         "Loading Linux"

static int        vfd_is_open;
static unsigned char    vfd[40];
static int        vfd_cursor;
static unsigned char    ledpb, led;

static void update_vfd(void)
{
      int   i;

      /* cursor home */
      outb(0x02, BRIQ_PANEL_VFD_IOPORT);
      for (i=0; i<20; i++)
            outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);

      /* cursor to next line */
      outb(0xc0, BRIQ_PANEL_VFD_IOPORT);
      for (i=20; i<40; i++)
            outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);

}

static void set_led(char state)
{
      if (state == 'R')
            led = 0x01;
      else if (state == 'G')
            led = 0x02;
      else if (state == 'Y')
            led = 0x03;
      else if (state == 'X')
            led = 0x00;
      outb(led, BRIQ_PANEL_LED_IOPORT);
}

static int briq_panel_open(struct inode *ino, struct file *filep)
{
      /* enforce single access */
      if (vfd_is_open)
            return -EBUSY;
      vfd_is_open = 1;

      return 0;
}

static int briq_panel_release(struct inode *ino, struct file *filep)
{
      if (!vfd_is_open)
            return -ENODEV;

      vfd_is_open = 0;

      return 0;
}

static ssize_t briq_panel_read(struct file *file, char __user *buf, size_t count,
                   loff_t *ppos)
{
      unsigned short c;
      unsigned char cp;

      if (!vfd_is_open)
            return -ENODEV;

      c = (inb(BRIQ_PANEL_LED_IOPORT) & 0x000c) | (ledpb & 0x0003);
      set_led(' ');
      /* upper button released */
      if ((!(ledpb & 0x0004)) && (c & 0x0004)) {
            cp = ' ';
            ledpb = c;
            if (copy_to_user(buf, &cp, 1))
                  return -EFAULT;
            return 1;
      }
      /* lower button released */
      else if ((!(ledpb & 0x0008)) && (c & 0x0008)) {
            cp = '\r';
            ledpb = c;
            if (copy_to_user(buf, &cp, 1))
                  return -EFAULT;
            return 1;
      } else {
            ledpb = c;
            return 0;
      }
}

static void scroll_vfd( void )
{
      int   i;

      for (i=0; i<20; i++) {
            vfd[i] = vfd[i+20];
            vfd[i+20] = ' ';
      }
      vfd_cursor = 20;
}

static ssize_t briq_panel_write(struct file *file, const char __user *buf, size_t len,
                    loff_t *ppos)
{
      size_t indx = len;
      int i, esc = 0;

      if (!vfd_is_open)
            return -EBUSY;

      for (;;) {
            char c;
            if (!indx)
                  break;
            if (get_user(c, buf))
                  return -EFAULT;
            if (esc) {
                  set_led(c);
                  esc = 0;
            } else if (c == 27) {
                  esc = 1;
            } else if (c == 12) {
                  /* do a form feed */
                  for (i=0; i<40; i++)
                        vfd[i] = ' ';
                  vfd_cursor = 0;
            } else if (c == 10) {
                  if (vfd_cursor < 20)
                        vfd_cursor = 20;
                  else if (vfd_cursor < 40)
                        vfd_cursor = 40;
                  else if (vfd_cursor < 60)
                        vfd_cursor = 60;
                  if (vfd_cursor > 59)
                        scroll_vfd();
            } else {
                  /* just a character */
                  if (vfd_cursor > 39)
                        scroll_vfd();
                  vfd[vfd_cursor++] = c;
            }
            indx--;
            buf++;
      }
      update_vfd();

      return len;
}

static const struct file_operations briq_panel_fops = {
      .owner            = THIS_MODULE,
      .read       = briq_panel_read,
      .write            = briq_panel_write,
      .open       = briq_panel_open,
      .release    = briq_panel_release,
};

static struct miscdevice briq_panel_miscdev = {
      BRIQ_PANEL_MINOR,
      "briq_panel",
      &briq_panel_fops
};

static int __init briq_panel_init(void)
{
      struct device_node *root = of_find_node_by_path("/");
      const char *machine;
      int i;

      machine = of_get_property(root, "model", NULL);
      if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0) {
            of_node_put(root);
            return -ENODEV;
      }
      of_node_put(root);

      printk(KERN_INFO
            "briq_panel: v%s Dr. Karsten Jeppesen (kj@totalimpact.com)\n",
            BRIQ_PANEL_VER);

      if (!request_region(BRIQ_PANEL_VFD_IOPORT, 4, "BRIQ Front Panel"))
            return -EBUSY;

      if (!request_region(BRIQ_PANEL_LED_IOPORT, 2, "BRIQ Front Panel")) {
            release_region(BRIQ_PANEL_VFD_IOPORT, 4);
            return -EBUSY;
      }
      ledpb = inb(BRIQ_PANEL_LED_IOPORT) & 0x000c;

      if (misc_register(&briq_panel_miscdev) < 0) {
            release_region(BRIQ_PANEL_VFD_IOPORT, 4);
            release_region(BRIQ_PANEL_LED_IOPORT, 2);
            return -EBUSY;
      }

      outb(0x38, BRIQ_PANEL_VFD_IOPORT);  /* Function set */
      outb(0x01, BRIQ_PANEL_VFD_IOPORT);  /* Clear display */
      outb(0x0c, BRIQ_PANEL_VFD_IOPORT);  /* Display on */
      outb(0x06, BRIQ_PANEL_VFD_IOPORT);  /* Entry normal */
      for (i=0; i<40; i++)
            vfd[i]=' ';
#ifndef MODULE
      vfd[0] = 'L';
      vfd[1] = 'o';
      vfd[2] = 'a';
      vfd[3] = 'd';
      vfd[4] = 'i';
      vfd[5] = 'n';
      vfd[6] = 'g';
      vfd[7] = ' ';
      vfd[8] = '.';
      vfd[9] = '.';
      vfd[10] = '.';
#endif /* !MODULE */

      update_vfd();

      return 0;
}

static void __exit briq_panel_exit(void)
{
      misc_deregister(&briq_panel_miscdev);
      release_region(BRIQ_PANEL_VFD_IOPORT, 4);
      release_region(BRIQ_PANEL_LED_IOPORT, 2);
}

module_init(briq_panel_init);
module_exit(briq_panel_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Karsten Jeppesen <karsten@jeppesens.com>");
MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");

Generated by  Doxygen 1.6.0   Back to index