[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>
This commit is contained in:
Benjamin Herrenschmidt
Paul Mackerras
parent
26c5032eaa
commit
a45b83957d
3 changed files with 283 additions and 0 deletions
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@ -495,6 +495,20 @@ config LEGACY_PTY_COUNT
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When not in use, each legacy PTY occupies 12 bytes on 32-bit
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architectures and 24 bytes on 64-bit architectures.
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config BRIQ_PANEL
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tristate 'Total Impact briQ front panel driver'
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---help---
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The briQ is a small footprint CHRP computer with a frontpanel VFD, a
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tristate led and two switches. It is the size of a CDROM drive.
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If you have such one and want anything showing on the VFD then you
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must answer Y here.
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To compile this driver as a module, choose M here: the
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module will be called briq_panel.
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It's safe to say N here.
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config PRINTER
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tristate "Parallel printer support"
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depends on PARPORT
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@ -51,6 +51,7 @@ obj-$(CONFIG_VIOCONS) += viocons.o
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obj-$(CONFIG_VIOTAPE) += viotape.o
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obj-$(CONFIG_HVCS) += hvcs.o
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obj-$(CONFIG_SGI_MBCS) += mbcs.o
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obj-$(CONFIG_BRIQ_PANEL) += briq_panel.o
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obj-$(CONFIG_PRINTER) += lp.o
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obj-$(CONFIG_TIPAR) += tipar.o
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268
drivers/char/briq_panel.c
Normal file
268
drivers/char/briq_panel.c
Normal file
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@ -0,0 +1,268 @@
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/*
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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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#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/slab.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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#include <asm/prom.h>
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#define BRIQ_PANEL_MINOR 156
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#define BRIQ_PANEL_VFD_IOPORT 0x0390
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#define BRIQ_PANEL_LED_IOPORT 0x0398
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#define BRIQ_PANEL_VER "1.1 (04/20/2002)"
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#define BRIQ_PANEL_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 update_vfd(void)
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{
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int i;
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/* cursor home */
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outb(0x02, BRIQ_PANEL_VFD_IOPORT);
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for (i=0; i<20; i++)
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outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
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/* cursor to next line */
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outb(0xc0, BRIQ_PANEL_VFD_IOPORT);
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for (i=20; i<40; i++)
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outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
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}
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static void set_led(char state)
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{
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if (state == 'R')
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led = 0x01;
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else if (state == 'G')
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led = 0x02;
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else if (state == 'Y')
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led = 0x03;
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else if (state == 'X')
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led = 0x00;
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outb(led, BRIQ_PANEL_LED_IOPORT);
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}
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static int briq_panel_open(struct inode *ino, struct file *filep)
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{
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/* enforce single access */
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if (vfd_is_open)
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return -EBUSY;
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vfd_is_open = 1;
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return 0;
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}
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static int briq_panel_release(struct inode *ino, struct file *filep)
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{
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if (!vfd_is_open)
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return -ENODEV;
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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 briq_panel_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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#if 0 /* Can't seek (pread) on this device */
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if (ppos != &file->f_pos)
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return -ESPIPE;
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#endif
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if (!vfd_is_open)
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return -ENODEV;
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c = (inb(BRIQ_PANEL_LED_IOPORT) & 0x000c) | (ledpb & 0x0003);
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set_led(' ');
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/* upper button released */
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if ((!(ledpb & 0x0004)) && (c & 0x0004)) {
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cp = ' ';
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ledpb = c;
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if (copy_to_user(buf, &cp, 1))
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return -EFAULT;
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return 1;
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}
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/* lower button released */
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else if ((!(ledpb & 0x0008)) && (c & 0x0008)) {
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cp = '\r';
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ledpb = c;
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if (copy_to_user(buf, &cp, 1))
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return -EFAULT;
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return 1;
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} else {
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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 scroll_vfd( 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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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 briq_panel_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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#if 0 /* Can't seek (pwrite) on this device */
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if (ppos != &file->f_pos)
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return -ESPIPE;
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#endif
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if (!vfd_is_open)
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return -EBUSY;
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for (;;) {
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if (!indx)
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break;
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if (esc) {
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set_led(*buf);
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esc = 0;
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} else if (*buf == 27) {
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esc = 1;
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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++)
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vfd[i] = ' ';
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vfd_cursor = 0;
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} else if (*buf == 10) {
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if (vfd_cursor < 20)
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vfd_cursor = 20;
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else if (vfd_cursor < 40)
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vfd_cursor = 40;
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else if (vfd_cursor < 60)
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vfd_cursor = 60;
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if (vfd_cursor > 59)
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scroll_vfd();
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} else {
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/* just a character */
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if (vfd_cursor > 39)
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scroll_vfd();
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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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update_vfd();
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return len;
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}
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static struct file_operations briq_panel_fops = {
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.owner = THIS_MODULE,
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.read = briq_panel_read,
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.write = briq_panel_write,
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.open = briq_panel_open,
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.release = briq_panel_release,
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};
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static struct miscdevice briq_panel_miscdev = {
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BRIQ_PANEL_MINOR,
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"briq_panel",
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&briq_panel_fops
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};
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static int __init briq_panel_init(void)
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{
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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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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;
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printk(KERN_INFO
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"briq_panel: v%s Dr. Karsten Jeppesen (kj@totalimpact.com)\n",
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BRIQ_PANEL_VER);
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if (!request_region(BRIQ_PANEL_VFD_IOPORT, 4, "BRIQ Front Panel"))
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return -EBUSY;
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if (!request_region(BRIQ_PANEL_LED_IOPORT, 2, "BRIQ Front Panel")) {
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release_region(BRIQ_PANEL_VFD_IOPORT, 4);
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return -EBUSY;
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}
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ledpb = inb(BRIQ_PANEL_LED_IOPORT) & 0x000c;
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if (misc_register(&briq_panel_miscdev) < 0) {
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release_region(BRIQ_PANEL_VFD_IOPORT, 4);
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release_region(BRIQ_PANEL_LED_IOPORT, 2);
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return -EBUSY;
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}
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outb(0x38, BRIQ_PANEL_VFD_IOPORT); /* Function set */
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outb(0x01, BRIQ_PANEL_VFD_IOPORT); /* Clear display */
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outb(0x0c, BRIQ_PANEL_VFD_IOPORT); /* Display on */
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outb(0x06, BRIQ_PANEL_VFD_IOPORT); /* Entry normal */
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for (i=0; i<40; i++)
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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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update_vfd();
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return 0;
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}
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static void __exit briq_panel_exit(void)
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{
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misc_deregister(&briq_panel_miscdev);
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release_region(BRIQ_PANEL_VFD_IOPORT, 4);
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release_region(BRIQ_PANEL_LED_IOPORT, 2);
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}
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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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