[POWERPC] Add support for briq front panel

This adds the driver for the Briq front panel. This is a cleaned up
version of a driver that has been floating around for some time now,
initially written by Karsten Jeppesen <karsten@jeppesens.com> and
cleaned up by jk and myself.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index c40e487..11de59f 100644 (file)
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -495,6 +495,20 @@ config LEGACY_PTY_COUNT
          When not in use, each legacy PTY occupies 12 bytes on 32-bit
          architectures and 24 bytes on 64-bit architectures.
 
+config BRIQ_PANEL
+       tristate 'Total Impact briQ front panel driver'
+       ---help---
+         The briQ is a small footprint CHRP computer with a frontpanel VFD, a
+         tristate led and two switches. It is the size of a CDROM drive.
+
+         If you have such one and want anything showing on the VFD then you
+         must answer Y here.
+
+         To compile this driver as a module, choose M here: the
+         module will be called briq_panel.
+
+         It's safe to say N here.
+
 config PRINTER
        tristate "Parallel printer support"
        depends on PARPORT

diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 6e0f446..7a7ee57 100644 (file)
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_VIOCONS)         += viocons.o
 obj-$(CONFIG_VIOTAPE)          += viotape.o
 obj-$(CONFIG_HVCS)             += hvcs.o
 obj-$(CONFIG_SGI_MBCS)         += mbcs.o
+obj-$(CONFIG_BRIQ_PANEL)       += briq_panel.o
 
 obj-$(CONFIG_PRINTER)          += lp.o
 obj-$(CONFIG_TIPAR)            += tipar.o

diff --git a/drivers/char/briq_panel.c b/drivers/char/briq_panel.c
new file mode 100644 (file)
index 0000000..a0e5eac
--- /dev/null
+++ b/drivers/char/briq_panel.c
@@ -0,0 +1,268 @@
+/*
+ * 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/sched.h>
+#include <linux/tty.h>
+#include <linux/timer.h>
+#include <linux/config.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 *buf, size_t count,
+                        loff_t *ppos)
+{
+       unsigned short c;
+       unsigned char cp;
+
+#if 0  /*  Can't seek (pread) on this device  */
+       if (ppos != &file->f_pos)
+               return -ESPIPE;
+#endif
+
+       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 *buf, size_t len,
+                         loff_t *ppos)
+{
+       size_t indx = len;
+       int i, esc = 0;
+
+#if 0  /*  Can't seek (pwrite) on this device  */
+       if (ppos != &file->f_pos)
+               return -ESPIPE;
+#endif
+
+       if (!vfd_is_open)
+               return -EBUSY;
+
+       for (;;) {
+               if (!indx)
+                       break;
+               if (esc) {
+                       set_led(*buf);
+                       esc = 0;
+               } else if (*buf == 27) {
+                       esc = 1;
+               } else if (*buf == 12) {
+                       /* do a form feed */
+                       for (i=0; i<40; i++)
+                               vfd[i] = ' ';
+                       vfd_cursor = 0;
+               } else if (*buf == 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++] = *buf;
+               }
+               indx--;
+               buf++;
+       }
+       update_vfd();
+
+       return len;
+}
+
+static 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 = find_path_device("/");
+       char *machine;
+       int i;
+
+       machine = get_property(root, "model", NULL);
+       if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0)
+               return -ENODEV;
+
+       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");