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Commit a45b8395 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt Committed by Paul Mackerras
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[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: default avatarJeremy Kerr <jk@ozlabs.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 26c5032e

drivers/char/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -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

drivers/char/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/char/briq_panel.c

0 → 100644
+268 −0
Original line number Diff line number Diff line 
/*

 * 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");