Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...
[linux-2.6] / drivers / char / lcd.c
1 /*
2  * LCD, LED and Button interface for Cobalt
3  *
4  * This file is subject to the terms and conditions of the GNU General Public
5  * License.  See the file "COPYING" in the main directory of this archive
6  * for more details.
7  *
8  * Copyright (C) 1996, 1997 by Andrew Bose
9  *
10  * Linux kernel version history:
11  *       March 2001: Ported from 2.0.34  by Liam Davies
12  *
13  */
14 #include <linux/types.h>
15 #include <linux/errno.h>
16 #include <linux/miscdevice.h>
17 #include <linux/slab.h>
18 #include <linux/ioport.h>
19 #include <linux/fcntl.h>
20 #include <linux/mc146818rtc.h>
21 #include <linux/netdevice.h>
22 #include <linux/sched.h>
23 #include <linux/delay.h>
24
25 #include <asm/io.h>
26 #include <asm/uaccess.h>
27 #include <asm/system.h>
28
29 #include "lcd.h"
30
31 static int lcd_ioctl(struct inode *inode, struct file *file,
32                      unsigned int cmd, unsigned long arg);
33
34 static unsigned int lcd_present = 1;
35
36 /* used in arch/mips/cobalt/reset.c */
37 int led_state = 0;
38
39 #if defined(CONFIG_TULIP) && 0
40
41 #define MAX_INTERFACES  8
42 static linkcheck_func_t linkcheck_callbacks[MAX_INTERFACES];
43 static void *linkcheck_cookies[MAX_INTERFACES];
44
45 int lcd_register_linkcheck_func(int iface_num, void *func, void *cookie)
46 {
47         if (iface_num < 0 ||
48             iface_num >= MAX_INTERFACES ||
49             linkcheck_callbacks[iface_num] != NULL)
50                 return -1;
51         linkcheck_callbacks[iface_num] = (linkcheck_func_t) func;
52         linkcheck_cookies[iface_num] = cookie;
53         return 0;
54 }
55 #endif
56
57 static int lcd_ioctl(struct inode *inode, struct file *file,
58                      unsigned int cmd, unsigned long arg)
59 {
60         struct lcd_display button_display;
61         unsigned long address, a;
62
63         switch (cmd) {
64         case LCD_On:
65                 udelay(150);
66                 BusyCheck();
67                 LCDWriteInst(0x0F);
68                 break;
69
70         case LCD_Off:
71                 udelay(150);
72                 BusyCheck();
73                 LCDWriteInst(0x08);
74                 break;
75
76         case LCD_Reset:
77                 udelay(150);
78                 LCDWriteInst(0x3F);
79                 udelay(150);
80                 LCDWriteInst(0x3F);
81                 udelay(150);
82                 LCDWriteInst(0x3F);
83                 udelay(150);
84                 LCDWriteInst(0x3F);
85                 udelay(150);
86                 LCDWriteInst(0x01);
87                 udelay(150);
88                 LCDWriteInst(0x06);
89                 break;
90
91         case LCD_Clear:
92                 udelay(150);
93                 BusyCheck();
94                 LCDWriteInst(0x01);
95                 break;
96
97         case LCD_Cursor_Left:
98                 udelay(150);
99                 BusyCheck();
100                 LCDWriteInst(0x10);
101                 break;
102
103         case LCD_Cursor_Right:
104                 udelay(150);
105                 BusyCheck();
106                 LCDWriteInst(0x14);
107                 break;
108
109         case LCD_Cursor_Off:
110                 udelay(150);
111                 BusyCheck();
112                 LCDWriteInst(0x0C);
113                 break;
114
115         case LCD_Cursor_On:
116                 udelay(150);
117                 BusyCheck();
118                 LCDWriteInst(0x0F);
119                 break;
120
121         case LCD_Blink_Off:
122                 udelay(150);
123                 BusyCheck();
124                 LCDWriteInst(0x0E);
125                 break;
126
127         case LCD_Get_Cursor_Pos:{
128                         struct lcd_display display;
129
130                         udelay(150);
131                         BusyCheck();
132                         display.cursor_address = (LCDReadInst);
133                         display.cursor_address =
134                             (display.cursor_address & 0x07F);
135                         if (copy_to_user
136                             ((struct lcd_display *) arg, &display,
137                              sizeof(struct lcd_display)))
138                                 return -EFAULT;
139
140                         break;
141                 }
142
143
144         case LCD_Set_Cursor_Pos:{
145                         struct lcd_display display;
146
147                         if (copy_from_user
148                             (&display, (struct lcd_display *) arg,
149                              sizeof(struct lcd_display)))
150                                 return -EFAULT;
151
152                         a = (display.cursor_address | kLCD_Addr);
153
154                         udelay(150);
155                         BusyCheck();
156                         LCDWriteInst(a);
157
158                         break;
159                 }
160
161         case LCD_Get_Cursor:{
162                         struct lcd_display display;
163
164                         udelay(150);
165                         BusyCheck();
166                         display.character = LCDReadData;
167
168                         if (copy_to_user
169                             ((struct lcd_display *) arg, &display,
170                              sizeof(struct lcd_display)))
171                                 return -EFAULT;
172                         udelay(150);
173                         BusyCheck();
174                         LCDWriteInst(0x10);
175
176                         break;
177                 }
178
179         case LCD_Set_Cursor:{
180                         struct lcd_display display;
181
182                         if (copy_from_user
183                             (&display, (struct lcd_display *) arg,
184                              sizeof(struct lcd_display)))
185                                 return -EFAULT;
186
187                         udelay(150);
188                         BusyCheck();
189                         LCDWriteData(display.character);
190                         udelay(150);
191                         BusyCheck();
192                         LCDWriteInst(0x10);
193
194                         break;
195                 }
196
197
198         case LCD_Disp_Left:
199                 udelay(150);
200                 BusyCheck();
201                 LCDWriteInst(0x18);
202                 break;
203
204         case LCD_Disp_Right:
205                 udelay(150);
206                 BusyCheck();
207                 LCDWriteInst(0x1C);
208                 break;
209
210         case LCD_Home:
211                 udelay(150);
212                 BusyCheck();
213                 LCDWriteInst(0x02);
214                 break;
215
216         case LCD_Write:{
217                         struct lcd_display display;
218                         unsigned int index;
219
220
221                         if (copy_from_user
222                             (&display, (struct lcd_display *) arg,
223                              sizeof(struct lcd_display)))
224                                 return -EFAULT;
225
226                         udelay(150);
227                         BusyCheck();
228                         LCDWriteInst(0x80);
229                         udelay(150);
230                         BusyCheck();
231
232                         for (index = 0; index < (display.size1); index++) {
233                                 udelay(150);
234                                 BusyCheck();
235                                 LCDWriteData(display.line1[index]);
236                                 BusyCheck();
237                         }
238
239                         udelay(150);
240                         BusyCheck();
241                         LCDWriteInst(0xC0);
242                         udelay(150);
243                         BusyCheck();
244                         for (index = 0; index < (display.size2); index++) {
245                                 udelay(150);
246                                 BusyCheck();
247                                 LCDWriteData(display.line2[index]);
248                         }
249
250                         break;
251                 }
252
253         case LCD_Read:{
254                         struct lcd_display display;
255
256                         BusyCheck();
257                         for (address = kDD_R00; address <= kDD_R01;
258                              address++) {
259                                 a = (address | kLCD_Addr);
260
261                                 udelay(150);
262                                 BusyCheck();
263                                 LCDWriteInst(a);
264                                 udelay(150);
265                                 BusyCheck();
266                                 display.line1[address] = LCDReadData;
267                         }
268
269                         display.line1[0x27] = '\0';
270
271                         for (address = kDD_R10; address <= kDD_R11;
272                              address++) {
273                                 a = (address | kLCD_Addr);
274
275                                 udelay(150);
276                                 BusyCheck();
277                                 LCDWriteInst(a);
278
279                                 udelay(150);
280                                 BusyCheck();
281                                 display.line2[address - 0x40] =
282                                     LCDReadData;
283                         }
284
285                         display.line2[0x27] = '\0';
286
287                         if (copy_to_user
288                             ((struct lcd_display *) arg, &display,
289                              sizeof(struct lcd_display)))
290                                 return -EFAULT;
291                         break;
292                 }
293
294 //  set all GPIO leds to led_display.leds
295
296         case LED_Set:{
297                         struct lcd_display led_display;
298
299
300                         if (copy_from_user
301                             (&led_display, (struct lcd_display *) arg,
302                              sizeof(struct lcd_display)))
303                                 return -EFAULT;
304
305                         led_state = led_display.leds;
306                         LEDSet(led_state);
307
308                         break;
309                 }
310
311
312 //  set only bit led_display.leds
313
314         case LED_Bit_Set:{
315                         unsigned int i;
316                         int bit = 1;
317                         struct lcd_display led_display;
318
319
320                         if (copy_from_user
321                             (&led_display, (struct lcd_display *) arg,
322                              sizeof(struct lcd_display)))
323                                 return -EFAULT;
324
325                         for (i = 0; i < (int) led_display.leds; i++) {
326                                 bit = 2 * bit;
327                         }
328
329                         led_state = led_state | bit;
330                         LEDSet(led_state);
331                         break;
332                 }
333
334 //  clear only bit led_display.leds
335
336         case LED_Bit_Clear:{
337                         unsigned int i;
338                         int bit = 1;
339                         struct lcd_display led_display;
340
341
342                         if (copy_from_user
343                             (&led_display, (struct lcd_display *) arg,
344                              sizeof(struct lcd_display)))
345                                 return -EFAULT;
346
347                         for (i = 0; i < (int) led_display.leds; i++) {
348                                 bit = 2 * bit;
349                         }
350
351                         led_state = led_state & ~bit;
352                         LEDSet(led_state);
353                         break;
354                 }
355
356
357         case BUTTON_Read:{
358                         button_display.buttons = GPIRead;
359                         if (copy_to_user
360                             ((struct lcd_display *) arg, &button_display,
361                              sizeof(struct lcd_display)))
362                                 return -EFAULT;
363                         break;
364                 }
365
366         case LINK_Check:{
367                         button_display.buttons =
368                             *((volatile unsigned long *) (0xB0100060));
369                         if (copy_to_user
370                             ((struct lcd_display *) arg, &button_display,
371                              sizeof(struct lcd_display)))
372                                 return -EFAULT;
373                         break;
374                 }
375
376         case LINK_Check_2:{
377                         int iface_num;
378
379                         /* panel-utils should pass in the desired interface status is wanted for
380                          * in "buttons" of the structure.  We will set this to non-zero if the
381                          * link is in fact up for the requested interface.  --DaveM
382                          */
383                         if (copy_from_user
384                             (&button_display, (struct lcd_display *) arg,
385                              sizeof(button_display)))
386                                 return -EFAULT;
387                         iface_num = button_display.buttons;
388 #if defined(CONFIG_TULIP) && 0
389                         if (iface_num >= 0 &&
390                             iface_num < MAX_INTERFACES &&
391                             linkcheck_callbacks[iface_num] != NULL) {
392                                 button_display.buttons =
393                                     linkcheck_callbacks[iface_num]
394                                     (linkcheck_cookies[iface_num]);
395                         } else
396 #endif
397                                 button_display.buttons = 0;
398
399                         if (__copy_to_user
400                             ((struct lcd_display *) arg, &button_display,
401                              sizeof(struct lcd_display)))
402                                 return -EFAULT;
403                         break;
404                 }
405
406         default:
407                 return -EINVAL;
408
409         }
410
411         return 0;
412
413 }
414
415 static int lcd_open(struct inode *inode, struct file *file)
416 {
417         if (!lcd_present)
418                 return -ENXIO;
419         else
420                 return 0;
421 }
422
423 /* Only RESET or NEXT counts as button pressed */
424
425 static inline int button_pressed(void)
426 {
427         unsigned long buttons = GPIRead;
428
429         if ((buttons == BUTTON_Next) || (buttons == BUTTON_Next_B)
430             || (buttons == BUTTON_Reset_B))
431                 return buttons;
432         return 0;
433 }
434
435 /* LED daemon sits on this and we wake him up once a key is pressed. */
436
437 static int lcd_waiters = 0;
438
439 static ssize_t lcd_read(struct file *file, char *buf,
440                      size_t count, loff_t *ofs)
441 {
442         long buttons_now;
443
444         if (lcd_waiters > 0)
445                 return -EINVAL;
446
447         lcd_waiters++;
448         while (((buttons_now = (long) button_pressed()) == 0) &&
449                !(signal_pending(current))) {
450                 msleep_interruptible(2000);
451         }
452         lcd_waiters--;
453
454         if (signal_pending(current))
455                 return -ERESTARTSYS;
456         return buttons_now;
457 }
458
459 /*
460  *      The various file operations we support.
461  */
462
463 static const struct file_operations lcd_fops = {
464         .read = lcd_read,
465         .ioctl = lcd_ioctl,
466         .open = lcd_open,
467 };
468
469 static struct miscdevice lcd_dev = {
470         MISC_DYNAMIC_MINOR,
471         "lcd",
472         &lcd_fops
473 };
474
475 static int lcd_init(void)
476 {
477         int ret;
478         unsigned long data;
479
480         pr_info("%s\n", LCD_DRIVER);
481         ret = misc_register(&lcd_dev);
482         if (ret) {
483                 printk(KERN_WARNING LCD "Unable to register misc device.\n");
484                 return ret;
485         }
486
487         /* Check region? Naaah! Just snarf it up. */
488 /*      request_region(RTC_PORT(0), RTC_IO_EXTENT, "lcd");*/
489
490         udelay(150);
491         data = LCDReadData;
492         if ((data & 0x000000FF) == (0x00)) {
493                 lcd_present = 0;
494                 pr_info(LCD "LCD Not Present\n");
495         } else {
496                 lcd_present = 1;
497                 WRITE_GAL(kGal_DevBank2PReg, kGal_DevBank2Cfg);
498                 WRITE_GAL(kGal_DevBank3PReg, kGal_DevBank3Cfg);
499         }
500
501         return 0;
502 }
503
504 static void __exit lcd_exit(void)
505 {
506         misc_deregister(&lcd_dev);
507 }
508
509 module_init(lcd_init);
510 module_exit(lcd_exit);
511
512 MODULE_AUTHOR("Andrew Bose");
513 MODULE_LICENSE("GPL");