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