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a45b8395 BH |
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 | ||
556889a4 | 9 | #include <linux/smp_lock.h> |
a45b8395 BH |
10 | #include <linux/types.h> |
11 | #include <linux/errno.h> | |
a45b8395 BH |
12 | #include <linux/tty.h> |
13 | #include <linux/timer.h> | |
a45b8395 BH |
14 | #include <linux/kernel.h> |
15 | #include <linux/wait.h> | |
16 | #include <linux/string.h> | |
a45b8395 BH |
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 | ||
34 | static int vfd_is_open; | |
35 | static unsigned char vfd[40]; | |
36 | static int vfd_cursor; | |
37 | static unsigned char ledpb, led; | |
38 | ||
39 | static 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 | ||
55 | static 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 | ||
68 | static int briq_panel_open(struct inode *ino, struct file *filep) | |
69 | { | |
ec79d605 | 70 | tty_lock(); |
556889a4 AB |
71 | /* enforce single access, vfd_is_open is protected by BKL */ |
72 | if (vfd_is_open) { | |
ec79d605 | 73 | tty_unlock(); |
a45b8395 | 74 | return -EBUSY; |
556889a4 | 75 | } |
a45b8395 BH |
76 | vfd_is_open = 1; |
77 | ||
ec79d605 | 78 | tty_unlock(); |
a45b8395 BH |
79 | return 0; |
80 | } | |
81 | ||
82 | static int briq_panel_release(struct inode *ino, struct file *filep) | |
83 | { | |
84 | if (!vfd_is_open) | |
85 | return -ENODEV; | |
86 | ||
87 | vfd_is_open = 0; | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
4ac493b1 | 92 | static ssize_t briq_panel_read(struct file *file, char __user *buf, size_t count, |
a45b8395 BH |
93 | loff_t *ppos) |
94 | { | |
95 | unsigned short c; | |
96 | unsigned char cp; | |
97 | ||
a45b8395 BH |
98 | if (!vfd_is_open) |
99 | return -ENODEV; | |
100 | ||
101 | c = (inb(BRIQ_PANEL_LED_IOPORT) & 0x000c) | (ledpb & 0x0003); | |
102 | set_led(' '); | |
103 | /* upper button released */ | |
104 | if ((!(ledpb & 0x0004)) && (c & 0x0004)) { | |
105 | cp = ' '; | |
106 | ledpb = c; | |
107 | if (copy_to_user(buf, &cp, 1)) | |
108 | return -EFAULT; | |
109 | return 1; | |
110 | } | |
111 | /* lower button released */ | |
112 | else if ((!(ledpb & 0x0008)) && (c & 0x0008)) { | |
113 | cp = '\r'; | |
114 | ledpb = c; | |
115 | if (copy_to_user(buf, &cp, 1)) | |
116 | return -EFAULT; | |
117 | return 1; | |
118 | } else { | |
119 | ledpb = c; | |
120 | return 0; | |
121 | } | |
122 | } | |
123 | ||
124 | static void scroll_vfd( void ) | |
125 | { | |
126 | int i; | |
127 | ||
128 | for (i=0; i<20; i++) { | |
129 | vfd[i] = vfd[i+20]; | |
130 | vfd[i+20] = ' '; | |
131 | } | |
132 | vfd_cursor = 20; | |
133 | } | |
134 | ||
4ac493b1 | 135 | static ssize_t briq_panel_write(struct file *file, const char __user *buf, size_t len, |
a45b8395 BH |
136 | loff_t *ppos) |
137 | { | |
138 | size_t indx = len; | |
139 | int i, esc = 0; | |
140 | ||
a45b8395 BH |
141 | if (!vfd_is_open) |
142 | return -EBUSY; | |
143 | ||
144 | for (;;) { | |
4ac493b1 | 145 | char c; |
a45b8395 BH |
146 | if (!indx) |
147 | break; | |
4ac493b1 AV |
148 | if (get_user(c, buf)) |
149 | return -EFAULT; | |
a45b8395 | 150 | if (esc) { |
4ac493b1 | 151 | set_led(c); |
a45b8395 | 152 | esc = 0; |
4ac493b1 | 153 | } else if (c == 27) { |
a45b8395 | 154 | esc = 1; |
4ac493b1 | 155 | } else if (c == 12) { |
a45b8395 BH |
156 | /* do a form feed */ |
157 | for (i=0; i<40; i++) | |
158 | vfd[i] = ' '; | |
159 | vfd_cursor = 0; | |
4ac493b1 | 160 | } else if (c == 10) { |
a45b8395 BH |
161 | if (vfd_cursor < 20) |
162 | vfd_cursor = 20; | |
163 | else if (vfd_cursor < 40) | |
164 | vfd_cursor = 40; | |
165 | else if (vfd_cursor < 60) | |
166 | vfd_cursor = 60; | |
167 | if (vfd_cursor > 59) | |
168 | scroll_vfd(); | |
169 | } else { | |
170 | /* just a character */ | |
171 | if (vfd_cursor > 39) | |
172 | scroll_vfd(); | |
4ac493b1 | 173 | vfd[vfd_cursor++] = c; |
a45b8395 BH |
174 | } |
175 | indx--; | |
176 | buf++; | |
177 | } | |
178 | update_vfd(); | |
179 | ||
180 | return len; | |
181 | } | |
182 | ||
2b8693c0 | 183 | static const struct file_operations briq_panel_fops = { |
a45b8395 BH |
184 | .owner = THIS_MODULE, |
185 | .read = briq_panel_read, | |
186 | .write = briq_panel_write, | |
187 | .open = briq_panel_open, | |
188 | .release = briq_panel_release, | |
6038f373 | 189 | .llseek = noop_llseek, |
a45b8395 BH |
190 | }; |
191 | ||
192 | static struct miscdevice briq_panel_miscdev = { | |
193 | BRIQ_PANEL_MINOR, | |
194 | "briq_panel", | |
195 | &briq_panel_fops | |
196 | }; | |
197 | ||
198 | static int __init briq_panel_init(void) | |
199 | { | |
8c8dc322 | 200 | struct device_node *root = of_find_node_by_path("/"); |
13b5aecc | 201 | const char *machine; |
a45b8395 BH |
202 | int i; |
203 | ||
40cd3a45 | 204 | machine = of_get_property(root, "model", NULL); |
8c8dc322 SR |
205 | if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0) { |
206 | of_node_put(root); | |
a45b8395 | 207 | return -ENODEV; |
8c8dc322 SR |
208 | } |
209 | of_node_put(root); | |
a45b8395 BH |
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 | ||
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"); |