tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/tty.h>
12#include <linux/timer.h>
13#include <linux/kernel.h>
14#include <linux/wait.h>
15#include <linux/string.h>
16#include <linux/ioport.h>
17#include <linux/delay.h>
18#include <linux/miscdevice.h>
19#include <linux/fs.h>
20#include <linux/mm.h>
21#include <linux/init.h>
22
23#include <asm/uaccess.h>
24#include <asm/io.h>
25#include <asm/prom.h>
26
27#define BRIQ_PANEL_MINOR 156
28#define BRIQ_PANEL_VFD_IOPORT 0x0390
29#define BRIQ_PANEL_LED_IOPORT 0x0398
30#define BRIQ_PANEL_VER "1.1 (04/20/2002)"
31#define BRIQ_PANEL_MSG0 "Loading Linux"
32
33static int vfd_is_open;
34static unsigned char vfd[40];
35static int vfd_cursor;
36static unsigned char ledpb, led;
37
38static void update_vfd(void)
39{
40 int i;
41
42 /* cursor home */
43 outb(0x02, BRIQ_PANEL_VFD_IOPORT);
44 for (i=0; i<20; i++)
45 outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
46
47 /* cursor to next line */
48 outb(0xc0, BRIQ_PANEL_VFD_IOPORT);
49 for (i=20; i<40; i++)
50 outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
51
52}
53
54static void set_led(char state)
55{
56 if (state == 'R')
57 led = 0x01;
58 else if (state == 'G')
59 led = 0x02;
60 else if (state == 'Y')
61 led = 0x03;
62 else if (state == 'X')
63 led = 0x00;
64 outb(led, BRIQ_PANEL_LED_IOPORT);
65}
66
67static int briq_panel_open(struct inode *ino, struct file *filep)
68{
69 tty_lock();
70 /* enforce single access, vfd_is_open is protected by BKL */
71 if (vfd_is_open) {
72 tty_unlock();
73 return -EBUSY;
74 }
75 vfd_is_open = 1;
76
77 tty_unlock();
78 return 0;
79}
80
81static int briq_panel_release(struct inode *ino, struct file *filep)
82{
83 if (!vfd_is_open)
84 return -ENODEV;
85
86 vfd_is_open = 0;
87
88 return 0;
89}
90
91static ssize_t briq_panel_read(struct file *file, char __user *buf, size_t count,
92 loff_t *ppos)
93{
94 unsigned short c;
95 unsigned char cp;
96
97 if (!vfd_is_open)
98 return -ENODEV;
99
100 c = (inb(BRIQ_PANEL_LED_IOPORT) & 0x000c) | (ledpb & 0x0003);
101 set_led(' ');
102 /* upper button released */
103 if ((!(ledpb & 0x0004)) && (c & 0x0004)) {
104 cp = ' ';
105 ledpb = c;
106 if (copy_to_user(buf, &cp, 1))
107 return -EFAULT;
108 return 1;
109 }
110 /* lower button released */
111 else if ((!(ledpb & 0x0008)) && (c & 0x0008)) {
112 cp = '\r';
113 ledpb = c;
114 if (copy_to_user(buf, &cp, 1))
115 return -EFAULT;
116 return 1;
117 } else {
118 ledpb = c;
119 return 0;
120 }
121}
122
123static void scroll_vfd( void )
124{
125 int i;
126
127 for (i=0; i<20; i++) {
128 vfd[i] = vfd[i+20];
129 vfd[i+20] = ' ';
130 }
131 vfd_cursor = 20;
132}
133
134static ssize_t briq_panel_write(struct file *file, const char __user *buf, size_t len,
135 loff_t *ppos)
136{
137 size_t indx = len;
138 int i, esc = 0;
139
140 if (!vfd_is_open)
141 return -EBUSY;
142
143 for (;;) {
144 char c;
145 if (!indx)
146 break;
147 if (get_user(c, buf))
148 return -EFAULT;
149 if (esc) {
150 set_led(c);
151 esc = 0;
152 } else if (c == 27) {
153 esc = 1;
154 } else if (c == 12) {
155 /* do a form feed */
156 for (i=0; i<40; i++)
157 vfd[i] = ' ';
158 vfd_cursor = 0;
159 } else if (c == 10) {
160 if (vfd_cursor < 20)
161 vfd_cursor = 20;
162 else if (vfd_cursor < 40)
163 vfd_cursor = 40;
164 else if (vfd_cursor < 60)
165 vfd_cursor = 60;
166 if (vfd_cursor > 59)
167 scroll_vfd();
168 } else {
169 /* just a character */
170 if (vfd_cursor > 39)
171 scroll_vfd();
172 vfd[vfd_cursor++] = c;
173 }
174 indx--;
175 buf++;
176 }
177 update_vfd();
178
179 return len;
180}
181
182static const struct file_operations briq_panel_fops = {
183 .owner = THIS_MODULE,
184 .read = briq_panel_read,
185 .write = briq_panel_write,
186 .open = briq_panel_open,
187 .release = briq_panel_release,
188 .llseek = noop_llseek,
189};
190
191static struct miscdevice briq_panel_miscdev = {
192 BRIQ_PANEL_MINOR,
193 "briq_panel",
194 &briq_panel_fops
195};
196
197static int __init briq_panel_init(void)
198{
199 struct device_node *root = of_find_node_by_path("/");
200 const char *machine;
201 int i;
202
203 machine = of_get_property(root, "model", NULL);
204 if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0) {
205 of_node_put(root);
206 return -ENODEV;
207 }
208 of_node_put(root);
209
210 printk(KERN_INFO
211 "briq_panel: v%s Dr. Karsten Jeppesen (kj@totalimpact.com)\n",
212 BRIQ_PANEL_VER);
213
214 if (!request_region(BRIQ_PANEL_VFD_IOPORT, 4, "BRIQ Front Panel"))
215 return -EBUSY;
216
217 if (!request_region(BRIQ_PANEL_LED_IOPORT, 2, "BRIQ Front Panel")) {
218 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
219 return -EBUSY;
220 }
221 ledpb = inb(BRIQ_PANEL_LED_IOPORT) & 0x000c;
222
223 if (misc_register(&briq_panel_miscdev) < 0) {
224 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
225 release_region(BRIQ_PANEL_LED_IOPORT, 2);
226 return -EBUSY;
227 }
228
229 outb(0x38, BRIQ_PANEL_VFD_IOPORT); /* Function set */
230 outb(0x01, BRIQ_PANEL_VFD_IOPORT); /* Clear display */
231 outb(0x0c, BRIQ_PANEL_VFD_IOPORT); /* Display on */
232 outb(0x06, BRIQ_PANEL_VFD_IOPORT); /* Entry normal */
233 for (i=0; i<40; i++)
234 vfd[i]=' ';
235#ifndef MODULE
236 vfd[0] = 'L';
237 vfd[1] = 'o';
238 vfd[2] = 'a';
239 vfd[3] = 'd';
240 vfd[4] = 'i';
241 vfd[5] = 'n';
242 vfd[6] = 'g';
243 vfd[7] = ' ';
244 vfd[8] = '.';
245 vfd[9] = '.';
246 vfd[10] = '.';
247#endif /* !MODULE */
248
249 update_vfd();
250
251 return 0;
252}
253
254static void __exit briq_panel_exit(void)
255{
256 misc_deregister(&briq_panel_miscdev);
257 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
258 release_region(BRIQ_PANEL_LED_IOPORT, 2);
259}
260
261module_init(briq_panel_init);
262module_exit(briq_panel_exit);
263
264MODULE_LICENSE("GPL");
265MODULE_AUTHOR("Karsten Jeppesen <karsten@jeppesens.com>");
266MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");