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/smp_lock.h>
10 #include <linux/types.h>
11 #include <linux/errno.h>
12 #include <linux/tty.h>
13 #include <linux/timer.h>
14 #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
35 static int vfd_is_open;
36 static unsigned char vfd[40];
37 static int vfd_cursor;
38 static unsigned char ledpb, led;
39
update_vfd(void)40 static 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
set_led(char state)56 static 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
briq_panel_open(struct inode * ino,struct file * filep)69 static int briq_panel_open(struct inode *ino, struct file *filep)
70 {
71 lock_kernel();
72 /* enforce single access, vfd_is_open is protected by BKL */
73 if (vfd_is_open) {
74 unlock_kernel();
75 return -EBUSY;
76 }
77 vfd_is_open = 1;
78
79 unlock_kernel();
80 return 0;
81 }
82
briq_panel_release(struct inode * ino,struct file * filep)83 static int briq_panel_release(struct inode *ino, struct file *filep)
84 {
85 if (!vfd_is_open)
86 return -ENODEV;
87
88 vfd_is_open = 0;
89
90 return 0;
91 }
92
briq_panel_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)93 static ssize_t briq_panel_read(struct file *file, char __user *buf, size_t count,
94 loff_t *ppos)
95 {
96 unsigned short c;
97 unsigned char cp;
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
scroll_vfd(void)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
briq_panel_write(struct file * file,const char __user * buf,size_t len,loff_t * ppos)136 static ssize_t briq_panel_write(struct file *file, const char __user *buf, size_t len,
137 loff_t *ppos)
138 {
139 size_t indx = len;
140 int i, esc = 0;
141
142 if (!vfd_is_open)
143 return -EBUSY;
144
145 for (;;) {
146 char c;
147 if (!indx)
148 break;
149 if (get_user(c, buf))
150 return -EFAULT;
151 if (esc) {
152 set_led(c);
153 esc = 0;
154 } else if (c == 27) {
155 esc = 1;
156 } else if (c == 12) {
157 /* do a form feed */
158 for (i=0; i<40; i++)
159 vfd[i] = ' ';
160 vfd_cursor = 0;
161 } else if (c == 10) {
162 if (vfd_cursor < 20)
163 vfd_cursor = 20;
164 else if (vfd_cursor < 40)
165 vfd_cursor = 40;
166 else if (vfd_cursor < 60)
167 vfd_cursor = 60;
168 if (vfd_cursor > 59)
169 scroll_vfd();
170 } else {
171 /* just a character */
172 if (vfd_cursor > 39)
173 scroll_vfd();
174 vfd[vfd_cursor++] = c;
175 }
176 indx--;
177 buf++;
178 }
179 update_vfd();
180
181 return len;
182 }
183
184 static const struct file_operations briq_panel_fops = {
185 .owner = THIS_MODULE,
186 .read = briq_panel_read,
187 .write = briq_panel_write,
188 .open = briq_panel_open,
189 .release = briq_panel_release,
190 };
191
192 static struct miscdevice briq_panel_miscdev = {
193 BRIQ_PANEL_MINOR,
194 "briq_panel",
195 &briq_panel_fops
196 };
197
briq_panel_init(void)198 static int __init briq_panel_init(void)
199 {
200 struct device_node *root = of_find_node_by_path("/");
201 const char *machine;
202 int i;
203
204 machine = of_get_property(root, "model", NULL);
205 if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0) {
206 of_node_put(root);
207 return -ENODEV;
208 }
209 of_node_put(root);
210
211 printk(KERN_INFO
212 "briq_panel: v%s Dr. Karsten Jeppesen (kj@totalimpact.com)\n",
213 BRIQ_PANEL_VER);
214
215 if (!request_region(BRIQ_PANEL_VFD_IOPORT, 4, "BRIQ Front Panel"))
216 return -EBUSY;
217
218 if (!request_region(BRIQ_PANEL_LED_IOPORT, 2, "BRIQ Front Panel")) {
219 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
220 return -EBUSY;
221 }
222 ledpb = inb(BRIQ_PANEL_LED_IOPORT) & 0x000c;
223
224 if (misc_register(&briq_panel_miscdev) < 0) {
225 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
226 release_region(BRIQ_PANEL_LED_IOPORT, 2);
227 return -EBUSY;
228 }
229
230 outb(0x38, BRIQ_PANEL_VFD_IOPORT); /* Function set */
231 outb(0x01, BRIQ_PANEL_VFD_IOPORT); /* Clear display */
232 outb(0x0c, BRIQ_PANEL_VFD_IOPORT); /* Display on */
233 outb(0x06, BRIQ_PANEL_VFD_IOPORT); /* Entry normal */
234 for (i=0; i<40; i++)
235 vfd[i]=' ';
236 #ifndef MODULE
237 vfd[0] = 'L';
238 vfd[1] = 'o';
239 vfd[2] = 'a';
240 vfd[3] = 'd';
241 vfd[4] = 'i';
242 vfd[5] = 'n';
243 vfd[6] = 'g';
244 vfd[7] = ' ';
245 vfd[8] = '.';
246 vfd[9] = '.';
247 vfd[10] = '.';
248 #endif /* !MODULE */
249
250 update_vfd();
251
252 return 0;
253 }
254
briq_panel_exit(void)255 static void __exit briq_panel_exit(void)
256 {
257 misc_deregister(&briq_panel_miscdev);
258 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
259 release_region(BRIQ_PANEL_LED_IOPORT, 2);
260 }
261
262 module_init(briq_panel_init);
263 module_exit(briq_panel_exit);
264
265 MODULE_LICENSE("GPL");
266 MODULE_AUTHOR("Karsten Jeppesen <karsten@jeppesens.com>");
267 MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");
268