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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 | ||
9 | #include <linux/types.h> | |
10 | #include <linux/errno.h> | |
a45b8395 BH |
11 | #include <linux/tty.h> |
12 | #include <linux/timer.h> | |
a45b8395 BH |
13 | #include <linux/kernel.h> |
14 | #include <linux/wait.h> | |
15 | #include <linux/string.h> | |
a45b8395 BH |
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 | ||
33 | static int vfd_is_open; | |
34 | static unsigned char vfd[40]; | |
35 | static int vfd_cursor; | |
36 | static unsigned char ledpb, led; | |
37 | ||
38 | static 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 | ||
54 | static 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 | ||
67 | static int briq_panel_open(struct inode *ino, struct file *filep) | |
68 | { | |
ec79d605 | 69 | tty_lock(); |
556889a4 AB |
70 | /* enforce single access, vfd_is_open is protected by BKL */ |
71 | if (vfd_is_open) { | |
ec79d605 | 72 | tty_unlock(); |
a45b8395 | 73 | return -EBUSY; |
556889a4 | 74 | } |
a45b8395 BH |
75 | vfd_is_open = 1; |
76 | ||
ec79d605 | 77 | tty_unlock(); |
a45b8395 BH |
78 | return 0; |
79 | } | |
80 | ||
81 | static 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 | ||
4ac493b1 | 91 | static ssize_t briq_panel_read(struct file *file, char __user *buf, size_t count, |
a45b8395 BH |
92 | loff_t *ppos) |
93 | { | |
94 | unsigned short c; | |
95 | unsigned char cp; | |
96 | ||
a45b8395 BH |
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 | ||
123 | static 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 | ||
4ac493b1 | 134 | static ssize_t briq_panel_write(struct file *file, const char __user *buf, size_t len, |
a45b8395 BH |
135 | loff_t *ppos) |
136 | { | |
137 | size_t indx = len; | |
138 | int i, esc = 0; | |
139 | ||
a45b8395 BH |
140 | if (!vfd_is_open) |
141 | return -EBUSY; | |
142 | ||
143 | for (;;) { | |
4ac493b1 | 144 | char c; |
a45b8395 BH |
145 | if (!indx) |
146 | break; | |
4ac493b1 AV |
147 | if (get_user(c, buf)) |
148 | return -EFAULT; | |
a45b8395 | 149 | if (esc) { |
4ac493b1 | 150 | set_led(c); |
a45b8395 | 151 | esc = 0; |
4ac493b1 | 152 | } else if (c == 27) { |
a45b8395 | 153 | esc = 1; |
4ac493b1 | 154 | } else if (c == 12) { |
a45b8395 BH |
155 | /* do a form feed */ |
156 | for (i=0; i<40; i++) | |
157 | vfd[i] = ' '; | |
158 | vfd_cursor = 0; | |
4ac493b1 | 159 | } else if (c == 10) { |
a45b8395 BH |
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(); | |
4ac493b1 | 172 | vfd[vfd_cursor++] = c; |
a45b8395 BH |
173 | } |
174 | indx--; | |
175 | buf++; | |
176 | } | |
177 | update_vfd(); | |
178 | ||
179 | return len; | |
180 | } | |
181 | ||
2b8693c0 | 182 | static const struct file_operations briq_panel_fops = { |
a45b8395 BH |
183 | .owner = THIS_MODULE, |
184 | .read = briq_panel_read, | |
185 | .write = briq_panel_write, | |
186 | .open = briq_panel_open, | |
187 | .release = briq_panel_release, | |
6038f373 | 188 | .llseek = noop_llseek, |
a45b8395 BH |
189 | }; |
190 | ||
191 | static struct miscdevice briq_panel_miscdev = { | |
192 | BRIQ_PANEL_MINOR, | |
193 | "briq_panel", | |
194 | &briq_panel_fops | |
195 | }; | |
196 | ||
197 | static int __init briq_panel_init(void) | |
198 | { | |
8c8dc322 | 199 | struct device_node *root = of_find_node_by_path("/"); |
13b5aecc | 200 | const char *machine; |
a45b8395 BH |
201 | int i; |
202 | ||
40cd3a45 | 203 | machine = of_get_property(root, "model", NULL); |
8c8dc322 SR |
204 | if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0) { |
205 | of_node_put(root); | |
a45b8395 | 206 | return -ENODEV; |
8c8dc322 SR |
207 | } |
208 | of_node_put(root); | |
a45b8395 BH |
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 | ||
254 | static 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 | ||
261 | module_init(briq_panel_init); | |
262 | module_exit(briq_panel_exit); | |
263 | ||
264 | MODULE_LICENSE("GPL"); | |
265 | MODULE_AUTHOR("Karsten Jeppesen <karsten@jeppesens.com>"); | |
266 | MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel"); |