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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>
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
36static int vfd_is_open;
37static unsigned char vfd[40];
38static int vfd_cursor;
39static unsigned char ledpb, led;
40
41static 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
57static 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
70static 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
80static 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
Al Viro4ac493b2006-09-23 18:20:56 +010090static ssize_t briq_panel_read(struct file *file, char __user *buf, size_t count,
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +100091 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
127static 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
Al Viro4ac493b2006-09-23 18:20:56 +0100138static ssize_t briq_panel_write(struct file *file, const char __user *buf, size_t len,
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000139 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 (;;) {
Al Viro4ac493b2006-09-23 18:20:56 +0100153 char c;
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000154 if (!indx)
155 break;
Al Viro4ac493b2006-09-23 18:20:56 +0100156 if (get_user(c, buf))
157 return -EFAULT;
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000158 if (esc) {
Al Viro4ac493b2006-09-23 18:20:56 +0100159 set_led(c);
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000160 esc = 0;
Al Viro4ac493b2006-09-23 18:20:56 +0100161 } else if (c == 27) {
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000162 esc = 1;
Al Viro4ac493b2006-09-23 18:20:56 +0100163 } else if (c == 12) {
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000164 /* do a form feed */
165 for (i=0; i<40; i++)
166 vfd[i] = ' ';
167 vfd_cursor = 0;
Al Viro4ac493b2006-09-23 18:20:56 +0100168 } else if (c == 10) {
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000169 if (vfd_cursor < 20)
170 vfd_cursor = 20;
171 else if (vfd_cursor < 40)
172 vfd_cursor = 40;
173 else if (vfd_cursor < 60)
174 vfd_cursor = 60;
175 if (vfd_cursor > 59)
176 scroll_vfd();
177 } else {
178 /* just a character */
179 if (vfd_cursor > 39)
180 scroll_vfd();
Al Viro4ac493b2006-09-23 18:20:56 +0100181 vfd[vfd_cursor++] = c;
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000182 }
183 indx--;
184 buf++;
185 }
186 update_vfd();
187
188 return len;
189}
190
191static struct file_operations briq_panel_fops = {
192 .owner = THIS_MODULE,
193 .read = briq_panel_read,
194 .write = briq_panel_write,
195 .open = briq_panel_open,
196 .release = briq_panel_release,
197};
198
199static struct miscdevice briq_panel_miscdev = {
200 BRIQ_PANEL_MINOR,
201 "briq_panel",
202 &briq_panel_fops
203};
204
205static int __init briq_panel_init(void)
206{
207 struct device_node *root = find_path_device("/");
Al Viro13b5aec2006-09-23 16:44:58 +0100208 const char *machine;
Benjamin Herrenschmidta45b8392006-07-04 15:06:20 +1000209 int i;
210
211 machine = get_property(root, "model", NULL);
212 if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0)
213 return -ENODEV;
214
215 printk(KERN_INFO
216 "briq_panel: v%s Dr. Karsten Jeppesen (kj@totalimpact.com)\n",
217 BRIQ_PANEL_VER);
218
219 if (!request_region(BRIQ_PANEL_VFD_IOPORT, 4, "BRIQ Front Panel"))
220 return -EBUSY;
221
222 if (!request_region(BRIQ_PANEL_LED_IOPORT, 2, "BRIQ Front Panel")) {
223 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
224 return -EBUSY;
225 }
226 ledpb = inb(BRIQ_PANEL_LED_IOPORT) & 0x000c;
227
228 if (misc_register(&briq_panel_miscdev) < 0) {
229 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
230 release_region(BRIQ_PANEL_LED_IOPORT, 2);
231 return -EBUSY;
232 }
233
234 outb(0x38, BRIQ_PANEL_VFD_IOPORT); /* Function set */
235 outb(0x01, BRIQ_PANEL_VFD_IOPORT); /* Clear display */
236 outb(0x0c, BRIQ_PANEL_VFD_IOPORT); /* Display on */
237 outb(0x06, BRIQ_PANEL_VFD_IOPORT); /* Entry normal */
238 for (i=0; i<40; i++)
239 vfd[i]=' ';
240#ifndef MODULE
241 vfd[0] = 'L';
242 vfd[1] = 'o';
243 vfd[2] = 'a';
244 vfd[3] = 'd';
245 vfd[4] = 'i';
246 vfd[5] = 'n';
247 vfd[6] = 'g';
248 vfd[7] = ' ';
249 vfd[8] = '.';
250 vfd[9] = '.';
251 vfd[10] = '.';
252#endif /* !MODULE */
253
254 update_vfd();
255
256 return 0;
257}
258
259static void __exit briq_panel_exit(void)
260{
261 misc_deregister(&briq_panel_miscdev);
262 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
263 release_region(BRIQ_PANEL_LED_IOPORT, 2);
264}
265
266module_init(briq_panel_init);
267module_exit(briq_panel_exit);
268
269MODULE_LICENSE("GPL");
270MODULE_AUTHOR("Karsten Jeppesen <karsten@jeppesens.com>");
271MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");