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