[linux.git] / drivers / char / 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 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 __user *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 (;;) {
		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 ([email protected])\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 <[email protected]>");
MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");
Commit	Line	Data
a45b8395 BH	1	/*
	2	* Drivers for the Total Impact PPC based computer "BRIQ"
	3	* by Dr. Karsten Jeppesen
	4	*
	5	*/
	6
	7	#include <linux/module.h>
	8
	9	#include <linux/types.h>
	10	#include <linux/errno.h>
a45b8395 BH	11	#include <linux/tty.h>
a45b8395 BH	12	#include <linux/timer.h>
a45b8395 BH	13	#include <linux/kernel.h>
	14	#include <linux/wait.h>
	15	#include <linux/string.h>
	16	#include <linux/slab.h>
	17	#include <linux/ioport.h>
	18	#include <linux/delay.h>
	19	#include <linux/miscdevice.h>
	20	#include <linux/fs.h>
	21	#include <linux/mm.h>
	22	#include <linux/init.h>
	23
	24	#include <asm/uaccess.h>
	25	#include <asm/io.h>
	26	#include <asm/prom.h>
	27
	28	#define BRIQ_PANEL_MINOR 156
	29	#define BRIQ_PANEL_VFD_IOPORT 0x0390
	30	#define BRIQ_PANEL_LED_IOPORT 0x0398
	31	#define BRIQ_PANEL_VER "1.1 (04/20/2002)"
	32	#define BRIQ_PANEL_MSG0 "Loading Linux"
	33
	34	static int vfd_is_open;
	35	static unsigned char vfd[40];
	36	static int vfd_cursor;
	37	static unsigned char ledpb, led;
	38
	39	static void update_vfd(void)
	40	{
	41	int i;
	42
	43	/* cursor home */
	44	outb(0x02, BRIQ_PANEL_VFD_IOPORT);
	45	for (i=0; i<20; i++)
	46	outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
	47
	48	/* cursor to next line */
	49	outb(0xc0, BRIQ_PANEL_VFD_IOPORT);
	50	for (i=20; i<40; i++)
	51	outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
	52
	53	}
	54
	55	static void set_led(char state)
	56	{
	57	if (state == 'R')
	58	led = 0x01;
	59	else if (state == 'G')
	60	led = 0x02;
	61	else if (state == 'Y')
	62	led = 0x03;
	63	else if (state == 'X')
	64	led = 0x00;
	65	outb(led, BRIQ_PANEL_LED_IOPORT);
	66	}
	67
	68	static int briq_panel_open(struct inode ino, struct file filep)
	69	{
	70	/* enforce single access */
	71	if (vfd_is_open)
	72	return -EBUSY;
	73	vfd_is_open = 1;
	74
	75	return 0;
	76	}
77
78	static int briq_panel_release(struct inode ino, struct file filep)
79	{
80	if (!vfd_is_open)
81	return -ENODEV;
82
83	vfd_is_open = 0;
84
85	return 0;
86	}
87
4ac493b1	88	static ssize_t briq_panel_read(struct file file, char __user buf, size_t count,
a45b8395 BH	89	loff_t *ppos)
	90	{
	91	unsigned short c;
	92	unsigned char cp;
	93
	94	#if 0 /* Can't seek (pread) on this device */
	95	if (ppos != &file->f_pos)
	96	return -ESPIPE;
	97	#endif
	98
	99	if (!vfd_is_open)
	100	return -ENODEV;
	101
	102	c = (inb(BRIQ_PANEL_LED_IOPORT) & 0x000c) \| (ledpb & 0x0003);
	103	set_led(' ');
	104	/* upper button released */
	105	if ((!(ledpb & 0x0004)) && (c & 0x0004)) {
	106	cp = ' ';
	107	ledpb = c;
	108	if (copy_to_user(buf, &cp, 1))
	109	return -EFAULT;
	110	return 1;
	111	}
	112	/* lower button released */
	113	else if ((!(ledpb & 0x0008)) && (c & 0x0008)) {
	114	cp = '\r';
	115	ledpb = c;
	116	if (copy_to_user(buf, &cp, 1))
	117	return -EFAULT;
	118	return 1;
	119	} else {
	120	ledpb = c;
	121	return 0;
	122	}
	123	}
	124
	125	static void scroll_vfd( void )
	126	{
	127	int i;
	128
	129	for (i=0; i<20; i++) {
	130	vfd[i] = vfd[i+20];
	131	vfd[i+20] = ' ';
	132	}
	133	vfd_cursor = 20;
	134	}
	135
4ac493b1	136	static ssize_t briq_panel_write(struct file file, const char __user buf, size_t len,
a45b8395 BH	137	loff_t *ppos)
	138	{
	139	size_t indx = len;
	140	int i, esc = 0;
	141
	142	#if 0 /* Can't seek (pwrite) on this device */
	143	if (ppos != &file->f_pos)
	144	return -ESPIPE;
	145	#endif
	146
	147	if (!vfd_is_open)
	148	return -EBUSY;
	149
	150	for (;;) {
4ac493b1	151	char c;
a45b8395 BH	152	if (!indx)
a45b8395 BH	153	break;
4ac493b1 AV	154	if (get_user(c, buf))
4ac493b1 AV	155	return -EFAULT;
a45b8395	156	if (esc) {
4ac493b1	157	set_led(c);
a45b8395	158	esc = 0;
4ac493b1	159	} else if (c == 27) {
a45b8395	160	esc = 1;
4ac493b1	161	} else if (c == 12) {
a45b8395 BH	162	/* do a form feed */
	163	for (i=0; i<40; i++)
	164	vfd[i] = ' ';
	165	vfd_cursor = 0;
4ac493b1	166	} else if (c == 10) {
a45b8395 BH	167	if (vfd_cursor < 20)
	168	vfd_cursor = 20;
	169	else if (vfd_cursor < 40)
	170	vfd_cursor = 40;
	171	else if (vfd_cursor < 60)
	172	vfd_cursor = 60;
	173	if (vfd_cursor > 59)
	174	scroll_vfd();
	175	} else {
	176	/* just a character */
	177	if (vfd_cursor > 39)
	178	scroll_vfd();
4ac493b1	179	vfd[vfd_cursor++] = c;
a45b8395 BH	180	}
	181	indx--;
	182	buf++;
	183	}
	184	update_vfd();
	185
	186	return len;
	187	}
	188
2b8693c0	189	static const struct file_operations briq_panel_fops = {
a45b8395 BH	190	.owner = THIS_MODULE,
	191	.read = briq_panel_read,
	192	.write = briq_panel_write,
	193	.open = briq_panel_open,
	194	.release = briq_panel_release,
	195	};
	196
	197	static struct miscdevice briq_panel_miscdev = {
	198	BRIQ_PANEL_MINOR,
	199	"briq_panel",
	200	&briq_panel_fops
	201	};
	202
	203	static int __init briq_panel_init(void)
	204	{
8c8dc322	205	struct device_node *root = of_find_node_by_path("/");
13b5aecc	206	const char *machine;
a45b8395 BH	207	int i;
a45b8395 BH	208
40cd3a45	209	machine = of_get_property(root, "model", NULL);
8c8dc322 SR	210	if (!machine \|\| strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0) {
8c8dc322 SR	211	of_node_put(root);
a45b8395	212	return -ENODEV;
8c8dc322 SR	213	}
8c8dc322 SR	214	of_node_put(root);
a45b8395 BH	215
	216	printk(KERN_INFO
	217	"briq_panel: v%s Dr. Karsten Jeppesen ([email protected])\n",
	218	BRIQ_PANEL_VER);
	219
	220	if (!request_region(BRIQ_PANEL_VFD_IOPORT, 4, "BRIQ Front Panel"))
	221	return -EBUSY;
	222
	223	if (!request_region(BRIQ_PANEL_LED_IOPORT, 2, "BRIQ Front Panel")) {
	224	release_region(BRIQ_PANEL_VFD_IOPORT, 4);
	225	return -EBUSY;
	226	}
	227	ledpb = inb(BRIQ_PANEL_LED_IOPORT) & 0x000c;
	228
	229	if (misc_register(&briq_panel_miscdev) < 0) {
	230	release_region(BRIQ_PANEL_VFD_IOPORT, 4);
	231	release_region(BRIQ_PANEL_LED_IOPORT, 2);
	232	return -EBUSY;
	233	}
	234
	235	outb(0x38, BRIQ_PANEL_VFD_IOPORT); /* Function set */
	236	outb(0x01, BRIQ_PANEL_VFD_IOPORT); /* Clear display */
	237	outb(0x0c, BRIQ_PANEL_VFD_IOPORT); /* Display on */
	238	outb(0x06, BRIQ_PANEL_VFD_IOPORT); /* Entry normal */
	239	for (i=0; i<40; i++)
	240	vfd[i]=' ';
	241	#ifndef MODULE
	242	vfd[0] = 'L';
	243	vfd[1] = 'o';
	244	vfd[2] = 'a';
	245	vfd[3] = 'd';
	246	vfd[4] = 'i';
	247	vfd[5] = 'n';
	248	vfd[6] = 'g';
	249	vfd[7] = ' ';
	250	vfd[8] = '.';
	251	vfd[9] = '.';
	252	vfd[10] = '.';
	253	#endif /* !MODULE */
	254
	255	update_vfd();
	256
	257	return 0;
	258	}
	259
	260	static void __exit briq_panel_exit(void)
	261	{
	262	misc_deregister(&briq_panel_miscdev);
	263	release_region(BRIQ_PANEL_VFD_IOPORT, 4);
	264	release_region(BRIQ_PANEL_LED_IOPORT, 2);
	265	}
	266
	267	module_init(briq_panel_init);
	268	module_exit(briq_panel_exit);
	269
	270	MODULE_LICENSE("GPL");
	271	MODULE_AUTHOR("Karsten Jeppesen <[email protected]>");
	272	MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");