[PATCH] powerpc: Add support for briq front panel (#)
Benjamin Herrenschmidt
benh at kernel.crashing.org
Tue Jul 4 15:06:20 EST 2006
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 at jeppesens.com> and
cleaned up by jk and myself.
Signed-off-by: Jeremy Kerr <jk at ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---
This version of the patch fixes a problem with getting "illegal seek"
all over the
place when reading from the driver.
Index: linux-irq-work/drivers/char/Kconfig
===================================================================
--- linux-irq-work.orig/drivers/char/Kconfig 2006-07-01 13:51:17.000000000 +1000
+++ linux-irq-work/drivers/char/Kconfig 2006-07-04 13:58:02.000000000 +1000
@@ -495,6 +495,20 @@
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
Index: linux-irq-work/drivers/char/Makefile
===================================================================
--- linux-irq-work.orig/drivers/char/Makefile 2006-07-01 13:51:17.000000000 +1000
+++ linux-irq-work/drivers/char/Makefile 2006-07-04 13:58:02.000000000 +1000
@@ -51,6 +51,7 @@
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
Index: linux-irq-work/drivers/char/briq_panel.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-irq-work/drivers/char/briq_panel.c 2006-07-04 15:01:37.000000000 +1000
@@ -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 at 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 at jeppesens.com>");
+MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");
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