blob: 9f8082f8dd290c61aa9d13d6dc5f5be64c68d47d [file] [log] [blame]
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +10001/*
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>
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +100014#include <linux/kernel.h>
15#include <linux/wait.h>
16#include <linux/string.h>
17#include <linux/slab.h>
18#include <linux/ioport.h>
19#include <linux/delay.h>
20#include <linux/miscdevice.h>
21#include <linux/fs.h>
22#include <linux/mm.h>
23#include <linux/init.h>
24
25#include <asm/uaccess.h>
26#include <asm/io.h>
27#include <asm/prom.h>
28
29#define BRIQ_PANEL_MINOR 156
30#define BRIQ_PANEL_VFD_IOPORT 0x0390
31#define BRIQ_PANEL_LED_IOPORT 0x0398
32#define BRIQ_PANEL_VER "1.1 (04/20/2002)"
33#define BRIQ_PANEL_MSG0 "Loading Linux"
34
35static int vfd_is_open;
36static unsigned char vfd[40];
37static int vfd_cursor;
38static unsigned char ledpb, led;
39
40static void update_vfd(void)
41{
42 int i;
43
44 /* cursor home */
45 outb(0x02, BRIQ_PANEL_VFD_IOPORT);
46 for (i=0; i<20; i++)
47 outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
48
49 /* cursor to next line */
50 outb(0xc0, BRIQ_PANEL_VFD_IOPORT);
51 for (i=20; i<40; i++)
52 outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
53
54}
55
56static void set_led(char state)
57{
58 if (state == 'R')
59 led = 0x01;
60 else if (state == 'G')
61 led = 0x02;
62 else if (state == 'Y')
63 led = 0x03;
64 else if (state == 'X')
65 led = 0x00;
66 outb(led, BRIQ_PANEL_LED_IOPORT);
67}
68
69static int briq_panel_open(struct inode *ino, struct file *filep)
70{
71 /* enforce single access */
72 if (vfd_is_open)
73 return -EBUSY;
74 vfd_is_open = 1;
75
76 return 0;
77}
78
79static int briq_panel_release(struct inode *ino, struct file *filep)
80{
81 if (!vfd_is_open)
82 return -ENODEV;
83
84 vfd_is_open = 0;
85
86 return 0;
87}
88
Al Viro4ac493b2006-09-23 18:20:56 +010089static ssize_t briq_panel_read(struct file *file, char __user *buf, size_t count,
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +100090 loff_t *ppos)
91{
92 unsigned short c;
93 unsigned char cp;
94
95#if 0 /* Can't seek (pread) on this device */
96 if (ppos != &file->f_pos)
97 return -ESPIPE;
98#endif
99
100 if (!vfd_is_open)
101 return -ENODEV;
102
103 c = (inb(BRIQ_PANEL_LED_IOPORT) & 0x000c) | (ledpb & 0x0003);
104 set_led(' ');
105 /* upper button released */
106 if ((!(ledpb & 0x0004)) && (c & 0x0004)) {
107 cp = ' ';
108 ledpb = c;
109 if (copy_to_user(buf, &cp, 1))
110 return -EFAULT;
111 return 1;
112 }
113 /* lower button released */
114 else if ((!(ledpb & 0x0008)) && (c & 0x0008)) {
115 cp = '\r';
116 ledpb = c;
117 if (copy_to_user(buf, &cp, 1))
118 return -EFAULT;
119 return 1;
120 } else {
121 ledpb = c;
122 return 0;
123 }
124}
125
126static void scroll_vfd( void )
127{
128 int i;
129
130 for (i=0; i<20; i++) {
131 vfd[i] = vfd[i+20];
132 vfd[i+20] = ' ';
133 }
134 vfd_cursor = 20;
135}
136
Al Viro4ac493b2006-09-23 18:20:56 +0100137static ssize_t briq_panel_write(struct file *file, const char __user *buf, size_t len,
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000138 loff_t *ppos)
139{
140 size_t indx = len;
141 int i, esc = 0;
142
143#if 0 /* Can't seek (pwrite) on this device */
144 if (ppos != &file->f_pos)
145 return -ESPIPE;
146#endif
147
148 if (!vfd_is_open)
149 return -EBUSY;
150
151 for (;;) {
Al Viro4ac493b2006-09-23 18:20:56 +0100152 char c;
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000153 if (!indx)
154 break;
Al Viro4ac493b2006-09-23 18:20:56 +0100155 if (get_user(c, buf))
156 return -EFAULT;
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000157 if (esc) {
Al Viro4ac493b2006-09-23 18:20:56 +0100158 set_led(c);
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000159 esc = 0;
Al Viro4ac493b2006-09-23 18:20:56 +0100160 } else if (c == 27) {
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000161 esc = 1;
Al Viro4ac493b2006-09-23 18:20:56 +0100162 } else if (c == 12) {
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000163 /* do a form feed */
164 for (i=0; i<40; i++)
165 vfd[i] = ' ';
166 vfd_cursor = 0;
Al Viro4ac493b2006-09-23 18:20:56 +0100167 } else if (c == 10) {
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000168 if (vfd_cursor < 20)
169 vfd_cursor = 20;
170 else if (vfd_cursor < 40)
171 vfd_cursor = 40;
172 else if (vfd_cursor < 60)
173 vfd_cursor = 60;
174 if (vfd_cursor > 59)
175 scroll_vfd();
176 } else {
177 /* just a character */
178 if (vfd_cursor > 39)
179 scroll_vfd();
Al Viro4ac493b2006-09-23 18:20:56 +0100180 vfd[vfd_cursor++] = c;
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000181 }
182 indx--;
183 buf++;
184 }
185 update_vfd();
186
187 return len;
188}
189
190static struct file_operations briq_panel_fops = {
191 .owner = THIS_MODULE,
192 .read = briq_panel_read,
193 .write = briq_panel_write,
194 .open = briq_panel_open,
195 .release = briq_panel_release,
196};
197
198static struct miscdevice briq_panel_miscdev = {
199 BRIQ_PANEL_MINOR,
200 "briq_panel",
201 &briq_panel_fops
202};
203
204static int __init briq_panel_init(void)
205{
206 struct device_node *root = find_path_device("/");
Al Viro13b5aec2006-09-23 16:44:58 +0100207 const char *machine;
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000208 int i;
209
210 machine = get_property(root, "model", NULL);
211 if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0)
212 return -ENODEV;
213
214 printk(KERN_INFO
215 "briq_panel: v%s Dr. Karsten Jeppesen (kj@totalimpact.com)\n",
216 BRIQ_PANEL_VER);
217
218 if (!request_region(BRIQ_PANEL_VFD_IOPORT, 4, "BRIQ Front Panel"))
219 return -EBUSY;
220
221 if (!request_region(BRIQ_PANEL_LED_IOPORT, 2, "BRIQ Front Panel")) {
222 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
223 return -EBUSY;
224 }
225 ledpb = inb(BRIQ_PANEL_LED_IOPORT) & 0x000c;
226
227 if (misc_register(&briq_panel_miscdev) < 0) {
228 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
229 release_region(BRIQ_PANEL_LED_IOPORT, 2);
230 return -EBUSY;
231 }
232
233 outb(0x38, BRIQ_PANEL_VFD_IOPORT); /* Function set */
234 outb(0x01, BRIQ_PANEL_VFD_IOPORT); /* Clear display */
235 outb(0x0c, BRIQ_PANEL_VFD_IOPORT); /* Display on */
236 outb(0x06, BRIQ_PANEL_VFD_IOPORT); /* Entry normal */
237 for (i=0; i<40; i++)
238 vfd[i]=' ';
239#ifndef MODULE
240 vfd[0] = 'L';
241 vfd[1] = 'o';
242 vfd[2] = 'a';
243 vfd[3] = 'd';
244 vfd[4] = 'i';
245 vfd[5] = 'n';
246 vfd[6] = 'g';
247 vfd[7] = ' ';
248 vfd[8] = '.';
249 vfd[9] = '.';
250 vfd[10] = '.';
251#endif /* !MODULE */
252
253 update_vfd();
254
255 return 0;
256}
257
258static void __exit briq_panel_exit(void)
259{
260 misc_deregister(&briq_panel_miscdev);
261 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
262 release_region(BRIQ_PANEL_LED_IOPORT, 2);
263}
264
265module_init(briq_panel_init);
266module_exit(briq_panel_exit);
267
268MODULE_LICENSE("GPL");
269MODULE_AUTHOR("Karsten Jeppesen <karsten@jeppesens.com>");
270MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");