Commit | Line | Data |
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1154ea7d JK |
1 | /* |
2 | * linux/drivers/video/arcfb.c -- FB driver for Arc monochrome LCD board | |
3 | * | |
4 | * Copyright (C) 2005, Jaya Kumar <jayalk@intworks.biz> | |
5 | * http://www.intworks.biz/arclcd | |
6 | * | |
7 | * This file is subject to the terms and conditions of the GNU General Public | |
8 | * License. See the file COPYING in the main directory of this archive for | |
9 | * more details. | |
10 | * | |
11 | * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven. | |
12 | * | |
13 | * This driver was written to be used with the Arc LCD board. Arc uses a | |
14 | * set of KS108 chips that control individual 64x64 LCD matrices. The board | |
15 | * can be paneled in a variety of setups such as 2x1=128x64, 4x4=256x256 and | |
16 | * so on. The interface between the board and the host is TTL based GPIO. The | |
17 | * GPIO requirements are 8 writable data lines and 4+n lines for control. On a | |
18 | * GPIO-less system, the board can be tested by connecting the respective sigs | |
19 | * up to a parallel port connector. The driver requires the IO addresses for | |
20 | * data and control GPIO at load time. It is unable to probe for the | |
21 | * existence of the LCD so it must be told at load time whether it should | |
22 | * be enabled or not. | |
23 | * | |
24 | * Todo: | |
25 | * - testing with 4x4 | |
26 | * - testing with interrupt hw | |
27 | * | |
28 | * General notes: | |
29 | * - User must set tuhold. It's in microseconds. According to the 108 spec, | |
30 | * the hold time is supposed to be at least 1 microsecond. | |
31 | * - User must set num_cols=x num_rows=y, eg: x=2 means 128 | |
32 | * - User must set arcfb_enable=1 to enable it | |
33 | * - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR | |
34 | * | |
35 | */ | |
36 | ||
37 | #include <linux/module.h> | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/errno.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/mm.h> | |
42 | #include <linux/tty.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/vmalloc.h> | |
45 | #include <linux/delay.h> | |
46 | #include <linux/interrupt.h> | |
47 | #include <linux/fb.h> | |
48 | #include <linux/init.h> | |
49 | #include <linux/arcfb.h> | |
50 | ||
51 | #include <asm/uaccess.h> | |
52 | ||
53 | #define floor8(a) (a&(~0x07)) | |
54 | #define floorXres(a,xres) (a&(~(xres - 1))) | |
55 | #define iceil8(a) (((int)((a+7)/8))*8) | |
56 | #define ceil64(a) (a|0x3F) | |
57 | #define ceilXres(a,xres) (a|(xres - 1)) | |
58 | ||
59 | /* ks108 chipset specific defines and code */ | |
60 | ||
61 | #define KS_SET_DPY_START_LINE 0xC0 | |
62 | #define KS_SET_PAGE_NUM 0xB8 | |
63 | #define KS_SET_X 0x40 | |
64 | #define KS_CEHI 0x01 | |
65 | #define KS_CELO 0x00 | |
66 | #define KS_SEL_CMD 0x08 | |
67 | #define KS_SEL_DATA 0x00 | |
68 | #define KS_DPY_ON 0x3F | |
69 | #define KS_DPY_OFF 0x3E | |
70 | #define KS_INTACK 0x40 | |
71 | #define KS_CLRINT 0x02 | |
72 | ||
73 | struct arcfb_par { | |
74 | unsigned long dio_addr; | |
75 | unsigned long cio_addr; | |
76 | unsigned long c2io_addr; | |
77 | atomic_t ref_count; | |
78 | unsigned char cslut[9]; | |
79 | struct fb_info *info; | |
80 | unsigned int irq; | |
81 | spinlock_t lock; | |
82 | }; | |
83 | ||
84 | static struct fb_fix_screeninfo arcfb_fix __initdata = { | |
85 | .id = "arcfb", | |
86 | .type = FB_TYPE_PACKED_PIXELS, | |
87 | .visual = FB_VISUAL_MONO01, | |
88 | .xpanstep = 0, | |
89 | .ypanstep = 1, | |
90 | .ywrapstep = 0, | |
91 | .accel = FB_ACCEL_NONE, | |
92 | }; | |
93 | ||
94 | static struct fb_var_screeninfo arcfb_var __initdata = { | |
95 | .xres = 128, | |
96 | .yres = 64, | |
97 | .xres_virtual = 128, | |
98 | .yres_virtual = 64, | |
99 | .bits_per_pixel = 1, | |
100 | .nonstd = 1, | |
101 | }; | |
102 | ||
103 | static unsigned long num_cols; | |
104 | static unsigned long num_rows; | |
105 | static unsigned long dio_addr; | |
106 | static unsigned long cio_addr; | |
107 | static unsigned long c2io_addr; | |
108 | static unsigned long splashval; | |
109 | static unsigned long tuhold; | |
110 | static unsigned int nosplash; | |
111 | static unsigned int arcfb_enable; | |
112 | static unsigned int irq; | |
113 | ||
114 | static DECLARE_WAIT_QUEUE_HEAD(arcfb_waitq); | |
115 | ||
116 | static void ks108_writeb_ctl(struct arcfb_par *par, | |
117 | unsigned int chipindex, unsigned char value) | |
118 | { | |
119 | unsigned char chipselval = par->cslut[chipindex]; | |
120 | ||
121 | outb(chipselval|KS_CEHI|KS_SEL_CMD, par->cio_addr); | |
122 | outb(value, par->dio_addr); | |
123 | udelay(tuhold); | |
124 | outb(chipselval|KS_CELO|KS_SEL_CMD, par->cio_addr); | |
125 | } | |
126 | ||
127 | static void ks108_writeb_mainctl(struct arcfb_par *par, unsigned char value) | |
128 | { | |
129 | ||
130 | outb(value, par->cio_addr); | |
131 | udelay(tuhold); | |
132 | } | |
133 | ||
134 | static unsigned char ks108_readb_ctl2(struct arcfb_par *par) | |
135 | { | |
136 | return inb(par->c2io_addr); | |
137 | } | |
138 | ||
139 | static void ks108_writeb_data(struct arcfb_par *par, | |
140 | unsigned int chipindex, unsigned char value) | |
141 | { | |
142 | unsigned char chipselval = par->cslut[chipindex]; | |
143 | ||
144 | outb(chipselval|KS_CEHI|KS_SEL_DATA, par->cio_addr); | |
145 | outb(value, par->dio_addr); | |
146 | udelay(tuhold); | |
147 | outb(chipselval|KS_CELO|KS_SEL_DATA, par->cio_addr); | |
148 | } | |
149 | ||
150 | static void ks108_set_start_line(struct arcfb_par *par, | |
151 | unsigned int chipindex, unsigned char y) | |
152 | { | |
153 | ks108_writeb_ctl(par, chipindex, KS_SET_DPY_START_LINE|y); | |
154 | } | |
155 | ||
156 | static void ks108_set_yaddr(struct arcfb_par *par, | |
157 | unsigned int chipindex, unsigned char y) | |
158 | { | |
159 | ks108_writeb_ctl(par, chipindex, KS_SET_PAGE_NUM|y); | |
160 | } | |
161 | ||
162 | static void ks108_set_xaddr(struct arcfb_par *par, | |
163 | unsigned int chipindex, unsigned char x) | |
164 | { | |
165 | ks108_writeb_ctl(par, chipindex, KS_SET_X|x); | |
166 | } | |
167 | ||
168 | static void ks108_clear_lcd(struct arcfb_par *par, unsigned int chipindex) | |
169 | { | |
170 | int i,j; | |
171 | ||
172 | for (i = 0; i <= 8; i++) { | |
173 | ks108_set_yaddr(par, chipindex, i); | |
174 | ks108_set_xaddr(par, chipindex, 0); | |
175 | for (j = 0; j < 64; j++) { | |
176 | ks108_writeb_data(par, chipindex, | |
177 | (unsigned char) splashval); | |
178 | } | |
179 | } | |
180 | } | |
181 | ||
182 | /* main arcfb functions */ | |
183 | ||
184 | static int arcfb_open(struct fb_info *info, int user) | |
185 | { | |
186 | struct arcfb_par *par = info->par; | |
187 | ||
188 | atomic_inc(&par->ref_count); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static int arcfb_release(struct fb_info *info, int user) | |
193 | { | |
194 | struct arcfb_par *par = info->par; | |
195 | int count = atomic_read(&par->ref_count); | |
196 | ||
197 | if (!count) | |
198 | return -EINVAL; | |
199 | atomic_dec(&par->ref_count); | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static int arcfb_pan_display(struct fb_var_screeninfo *var, | |
204 | struct fb_info *info) | |
205 | { | |
206 | int i; | |
207 | struct arcfb_par *par = info->par; | |
208 | ||
209 | if ((var->vmode & FB_VMODE_YWRAP) && (var->yoffset < 64) | |
210 | && (info->var.yres <= 64)) { | |
211 | for (i = 0; i < num_cols; i++) { | |
212 | ks108_set_start_line(par, i, var->yoffset); | |
213 | } | |
214 | info->var.yoffset = var->yoffset; | |
215 | return 0; | |
216 | } | |
217 | ||
218 | return -EINVAL; | |
219 | } | |
220 | ||
221 | static irqreturn_t arcfb_interrupt(int vec, void *dev_instance, | |
222 | struct pt_regs *regs) | |
223 | { | |
224 | struct fb_info *info = dev_instance; | |
225 | unsigned char ctl2status; | |
226 | struct arcfb_par *par = info->par; | |
227 | ||
228 | ctl2status = ks108_readb_ctl2(par); | |
229 | ||
230 | if (!(ctl2status & KS_INTACK)) /* not arc generated interrupt */ | |
231 | return IRQ_NONE; | |
232 | ||
233 | ks108_writeb_mainctl(par, KS_CLRINT); | |
234 | ||
235 | spin_lock(&par->lock); | |
236 | if (waitqueue_active(&arcfb_waitq)) { | |
237 | wake_up(&arcfb_waitq); | |
238 | } | |
239 | spin_unlock(&par->lock); | |
240 | ||
241 | return IRQ_HANDLED; | |
242 | } | |
243 | ||
244 | /* | |
245 | * here we handle a specific page on the lcd. the complexity comes from | |
246 | * the fact that the fb is laidout in 8xX vertical columns. we extract | |
247 | * each write of 8 vertical pixels. then we shift out as we move along | |
248 | * X. That's what rightshift does. bitmask selects the desired input bit. | |
249 | */ | |
250 | static void arcfb_lcd_update_page(struct arcfb_par *par, unsigned int upper, | |
251 | unsigned int left, unsigned int right, unsigned int distance) | |
252 | { | |
253 | unsigned char *src; | |
254 | unsigned int xindex, yindex, chipindex, linesize; | |
255 | int i, count; | |
256 | unsigned char val; | |
257 | unsigned char bitmask, rightshift; | |
258 | ||
259 | xindex = left >> 6; | |
260 | yindex = upper >> 6; | |
261 | chipindex = (xindex + (yindex*num_cols)); | |
262 | ||
263 | ks108_set_yaddr(par, chipindex, upper/8); | |
264 | ||
265 | linesize = par->info->var.xres/8; | |
266 | src = par->info->screen_base + (left/8) + (upper * linesize); | |
267 | ks108_set_xaddr(par, chipindex, left); | |
268 | ||
269 | bitmask=1; | |
270 | rightshift=0; | |
271 | while (left <= right) { | |
272 | val = 0; | |
273 | for (i = 0; i < 8; i++) { | |
274 | if ( i > rightshift) { | |
275 | val |= (*(src + (i*linesize)) & bitmask) | |
276 | << (i - rightshift); | |
277 | } else { | |
278 | val |= (*(src + (i*linesize)) & bitmask) | |
279 | >> (rightshift - i); | |
280 | } | |
281 | } | |
282 | ks108_writeb_data(par, chipindex, val); | |
283 | left++; | |
284 | count++; | |
285 | if (bitmask == 0x80) { | |
286 | bitmask = 1; | |
287 | src++; | |
288 | rightshift=0; | |
289 | } else { | |
290 | bitmask <<= 1; | |
291 | rightshift++; | |
292 | } | |
293 | } | |
294 | } | |
295 | ||
296 | /* | |
297 | * here we handle the entire vertical page of the update. we write across | |
298 | * lcd chips. update_page uses the upper/left values to decide which | |
299 | * chip to select for the right. upper is needed for setting the page | |
300 | * desired for the write. | |
301 | */ | |
302 | static void arcfb_lcd_update_vert(struct arcfb_par *par, unsigned int top, | |
303 | unsigned int bottom, unsigned int left, unsigned int right) | |
304 | { | |
305 | unsigned int distance, upper, lower; | |
306 | ||
307 | distance = (bottom - top) + 1; | |
308 | upper = top; | |
309 | lower = top + 7; | |
310 | ||
311 | while (distance > 0) { | |
312 | distance -= 8; | |
313 | arcfb_lcd_update_page(par, upper, left, right, 8); | |
314 | upper = lower + 1; | |
315 | lower = upper + 7; | |
316 | } | |
317 | } | |
318 | ||
319 | /* | |
320 | * here we handle horizontal blocks for the update. update_vert will | |
321 | * handle spaning multiple pages. we break out each horizontal | |
322 | * block in to individual blocks no taller than 64 pixels. | |
323 | */ | |
324 | static void arcfb_lcd_update_horiz(struct arcfb_par *par, unsigned int left, | |
325 | unsigned int right, unsigned int top, unsigned int h) | |
326 | { | |
327 | unsigned int distance, upper, lower; | |
328 | ||
329 | distance = h; | |
330 | upper = floor8(top); | |
331 | lower = min(upper + distance - 1, ceil64(upper)); | |
332 | ||
333 | while (distance > 0) { | |
334 | distance -= ((lower - upper) + 1 ); | |
335 | arcfb_lcd_update_vert(par, upper, lower, left, right); | |
336 | upper = lower + 1; | |
337 | lower = min(upper + distance - 1, ceil64(upper)); | |
338 | } | |
339 | } | |
340 | ||
341 | /* | |
342 | * here we start the process of spliting out the fb update into | |
343 | * individual blocks of pixels. we end up spliting into 64x64 blocks | |
344 | * and finally down to 64x8 pages. | |
345 | */ | |
346 | static void arcfb_lcd_update(struct arcfb_par *par, unsigned int dx, | |
347 | unsigned int dy, unsigned int w, unsigned int h) | |
348 | { | |
349 | unsigned int left, right, distance, y; | |
350 | ||
351 | /* align the request first */ | |
352 | y = floor8(dy); | |
353 | h += dy - y; | |
354 | h = iceil8(h); | |
355 | ||
356 | distance = w; | |
357 | left = dx; | |
358 | right = min(left + w - 1, ceil64(left)); | |
359 | ||
360 | while (distance > 0) { | |
361 | arcfb_lcd_update_horiz(par, left, right, y, h); | |
362 | distance -= ((right - left) + 1); | |
363 | left = right + 1; | |
364 | right = min(left + distance - 1, ceil64(left)); | |
365 | } | |
366 | } | |
367 | ||
368 | void arcfb_fillrect(struct fb_info *info, const struct fb_fillrect *rect) | |
369 | { | |
370 | struct arcfb_par *par = info->par; | |
371 | ||
372 | cfb_fillrect(info, rect); | |
373 | ||
374 | /* update the physical lcd */ | |
375 | arcfb_lcd_update(par, rect->dx, rect->dy, rect->width, rect->height); | |
376 | } | |
377 | ||
378 | void arcfb_copyarea(struct fb_info *info, const struct fb_copyarea *area) | |
379 | { | |
380 | struct arcfb_par *par = info->par; | |
381 | ||
382 | cfb_copyarea(info, area); | |
383 | ||
384 | /* update the physical lcd */ | |
385 | arcfb_lcd_update(par, area->dx, area->dy, area->width, area->height); | |
386 | } | |
387 | ||
388 | void arcfb_imageblit(struct fb_info *info, const struct fb_image *image) | |
389 | { | |
390 | struct arcfb_par *par = info->par; | |
391 | ||
392 | cfb_imageblit(info, image); | |
393 | ||
394 | /* update the physical lcd */ | |
395 | arcfb_lcd_update(par, image->dx, image->dy, image->width, | |
396 | image->height); | |
397 | } | |
398 | ||
399 | static int arcfb_ioctl(struct inode *inode, struct file *file, | |
400 | unsigned int cmd, unsigned long arg, | |
401 | struct fb_info *info) | |
402 | { | |
403 | void __user *argp = (void __user *)arg; | |
404 | struct arcfb_par *par = info->par; | |
405 | unsigned long flags; | |
406 | ||
407 | switch (cmd) { | |
408 | case FBIO_WAITEVENT: | |
409 | { | |
410 | DEFINE_WAIT(wait); | |
411 | /* illegal to wait on arc if no irq will occur */ | |
412 | if (!par->irq) | |
413 | return -EINVAL; | |
414 | ||
415 | /* wait until the Arc has generated an interrupt | |
416 | * which will wake us up */ | |
417 | spin_lock_irqsave(&par->lock, flags); | |
418 | prepare_to_wait(&arcfb_waitq, &wait, | |
419 | TASK_INTERRUPTIBLE); | |
420 | spin_unlock_irqrestore(&par->lock, flags); | |
421 | schedule(); | |
422 | finish_wait(&arcfb_waitq, &wait); | |
423 | } | |
424 | case FBIO_GETCONTROL2: | |
425 | { | |
426 | unsigned char ctl2; | |
427 | ||
428 | ctl2 = ks108_readb_ctl2(info->par); | |
429 | if (copy_to_user(argp, &ctl2, sizeof(ctl2))) | |
430 | return -EFAULT; | |
431 | return 0; | |
432 | } | |
433 | default: | |
434 | return -EINVAL; | |
435 | } | |
436 | } | |
437 | ||
438 | /* | |
439 | * this is the access path from userspace. they can seek and write to | |
440 | * the fb. it's inefficient for them to do anything less than 64*8 | |
441 | * writes since we update the lcd in each write() anyway. | |
442 | */ | |
443 | static ssize_t arcfb_write(struct file *file, const char *buf, size_t count, | |
444 | loff_t *ppos) | |
445 | { | |
446 | /* modded from epson 1355 */ | |
447 | ||
448 | struct inode *inode; | |
449 | int fbidx; | |
450 | struct fb_info *info; | |
451 | unsigned long p; | |
452 | int err=-EINVAL; | |
453 | unsigned int fbmemlength,x,y,w,h, bitppos, startpos, endpos, bitcount; | |
454 | struct arcfb_par *par; | |
455 | unsigned int xres; | |
456 | ||
457 | p = *ppos; | |
458 | inode = file->f_dentry->d_inode; | |
459 | fbidx = iminor(inode); | |
460 | info = registered_fb[fbidx]; | |
461 | par = info->par; | |
462 | ||
463 | if (!info || !info->screen_base) | |
464 | return -ENODEV; | |
465 | ||
466 | xres = info->var.xres; | |
467 | fbmemlength = (xres * info->var.yres)/8; | |
468 | ||
469 | if (p > fbmemlength) | |
470 | return -ENOSPC; | |
471 | ||
472 | err = 0; | |
473 | if ((count + p) > fbmemlength) { | |
474 | count = fbmemlength - p; | |
475 | err = -ENOSPC; | |
476 | } | |
477 | ||
478 | if (count) { | |
479 | char *base_addr; | |
480 | ||
481 | base_addr = info->screen_base; | |
482 | count -= copy_from_user(base_addr + p, buf, count); | |
483 | *ppos += count; | |
484 | err = -EFAULT; | |
485 | } | |
486 | ||
487 | ||
488 | bitppos = p*8; | |
489 | startpos = floorXres(bitppos, xres); | |
490 | endpos = ceilXres((bitppos + (count*8)), xres); | |
491 | bitcount = endpos - startpos; | |
492 | ||
493 | x = startpos % xres; | |
494 | y = startpos / xres; | |
495 | w = xres; | |
496 | h = bitcount / xres; | |
497 | arcfb_lcd_update(par, x, y, w, h); | |
498 | ||
499 | if (count) | |
500 | return count; | |
501 | return err; | |
502 | } | |
503 | ||
504 | static void arcfb_platform_release(struct device *device) | |
505 | { | |
506 | } | |
507 | ||
508 | static struct fb_ops arcfb_ops = { | |
509 | .owner = THIS_MODULE, | |
510 | .fb_open = arcfb_open, | |
511 | .fb_write = arcfb_write, | |
512 | .fb_release = arcfb_release, | |
513 | .fb_pan_display = arcfb_pan_display, | |
514 | .fb_fillrect = arcfb_fillrect, | |
515 | .fb_copyarea = arcfb_copyarea, | |
516 | .fb_imageblit = arcfb_imageblit, | |
517 | .fb_cursor = soft_cursor, | |
518 | .fb_ioctl = arcfb_ioctl, | |
519 | }; | |
520 | ||
521 | static int __init arcfb_probe(struct device *device) | |
522 | { | |
523 | struct platform_device *dev = to_platform_device(device); | |
524 | struct fb_info *info; | |
525 | int retval = -ENOMEM; | |
526 | int videomemorysize; | |
527 | unsigned char *videomemory; | |
528 | struct arcfb_par *par; | |
529 | int i; | |
530 | ||
531 | videomemorysize = (((64*64)*num_cols)*num_rows)/8; | |
532 | ||
533 | /* We need a flat backing store for the Arc's | |
534 | less-flat actual paged framebuffer */ | |
535 | if (!(videomemory = vmalloc(videomemorysize))) | |
536 | return retval; | |
537 | ||
538 | memset(videomemory, 0, videomemorysize); | |
539 | ||
540 | info = framebuffer_alloc(sizeof(struct arcfb_par), &dev->dev); | |
541 | if (!info) | |
542 | goto err; | |
543 | ||
544 | info->screen_base = (char __iomem *)videomemory; | |
545 | info->fbops = &arcfb_ops; | |
546 | ||
547 | info->var = arcfb_var; | |
548 | info->fix = arcfb_fix; | |
549 | par = info->par; | |
550 | par->info = info; | |
551 | ||
552 | if (!dio_addr || !cio_addr || !c2io_addr) { | |
553 | printk(KERN_WARNING "no IO addresses supplied\n"); | |
554 | goto err1; | |
555 | } | |
556 | par->dio_addr = dio_addr; | |
557 | par->cio_addr = cio_addr; | |
558 | par->c2io_addr = c2io_addr; | |
559 | par->cslut[0] = 0x00; | |
560 | par->cslut[1] = 0x06; | |
561 | info->flags = FBINFO_FLAG_DEFAULT; | |
562 | spin_lock_init(&par->lock); | |
563 | retval = register_framebuffer(info); | |
564 | if (retval < 0) | |
565 | goto err1; | |
566 | dev_set_drvdata(&dev->dev, info); | |
567 | if (irq) { | |
568 | par->irq = irq; | |
569 | if (request_irq(par->irq, &arcfb_interrupt, SA_SHIRQ, | |
570 | "arcfb", info)) { | |
571 | printk(KERN_INFO | |
572 | "arcfb: Failed req IRQ %d\n", par->irq); | |
573 | goto err1; | |
574 | } | |
575 | } | |
576 | printk(KERN_INFO | |
577 | "fb%d: Arc frame buffer device, using %dK of video memory\n", | |
578 | info->node, videomemorysize >> 10); | |
579 | ||
580 | /* this inits the lcd but doesn't clear dirty pixels */ | |
581 | for (i = 0; i < num_cols * num_rows; i++) { | |
582 | ks108_writeb_ctl(par, i, KS_DPY_OFF); | |
583 | ks108_set_start_line(par, i, 0); | |
584 | ks108_set_yaddr(par, i, 0); | |
585 | ks108_set_xaddr(par, i, 0); | |
586 | ks108_writeb_ctl(par, i, KS_DPY_ON); | |
587 | } | |
588 | ||
589 | /* if we were told to splash the screen, we just clear it */ | |
590 | if (!nosplash) { | |
591 | for (i = 0; i < num_cols * num_rows; i++) { | |
592 | printk(KERN_INFO "fb%d: splashing lcd %d\n", | |
593 | info->node, i); | |
594 | ks108_set_start_line(par, i, 0); | |
595 | ks108_clear_lcd(par, i); | |
596 | } | |
597 | } | |
598 | ||
599 | return 0; | |
600 | err1: | |
601 | framebuffer_release(info); | |
602 | err: | |
603 | vfree(videomemory); | |
604 | return retval; | |
605 | } | |
606 | ||
607 | static int arcfb_remove(struct device *device) | |
608 | { | |
609 | struct fb_info *info = dev_get_drvdata(device); | |
610 | ||
611 | if (info) { | |
612 | unregister_framebuffer(info); | |
613 | vfree(info->screen_base); | |
614 | framebuffer_release(info); | |
615 | } | |
616 | return 0; | |
617 | } | |
618 | ||
619 | static struct device_driver arcfb_driver = { | |
620 | .name = "arcfb", | |
621 | .bus = &platform_bus_type, | |
622 | .probe = arcfb_probe, | |
623 | .remove = arcfb_remove, | |
624 | }; | |
625 | ||
626 | static struct platform_device arcfb_device = { | |
627 | .name = "arcfb", | |
628 | .id = 0, | |
629 | .dev = { | |
630 | .release = arcfb_platform_release, | |
631 | } | |
632 | }; | |
633 | ||
634 | static int __init arcfb_init(void) | |
635 | { | |
636 | int ret; | |
637 | ||
638 | if (!arcfb_enable) | |
639 | return -ENXIO; | |
640 | ||
641 | ret = driver_register(&arcfb_driver); | |
642 | if (!ret) { | |
643 | ret = platform_device_register(&arcfb_device); | |
644 | if (ret) | |
645 | driver_unregister(&arcfb_driver); | |
646 | } | |
647 | return ret; | |
648 | ||
649 | } | |
650 | ||
651 | static void __exit arcfb_exit(void) | |
652 | { | |
653 | platform_device_unregister(&arcfb_device); | |
654 | driver_unregister(&arcfb_driver); | |
655 | } | |
656 | ||
657 | module_param(num_cols, ulong, 0); | |
658 | MODULE_PARM_DESC(num_cols, "Num horiz panels, eg: 2 = 128 bit wide"); | |
659 | module_param(num_rows, ulong, 0); | |
660 | MODULE_PARM_DESC(num_rows, "Num vert panels, eg: 1 = 64 bit high"); | |
661 | module_param(nosplash, uint, 0); | |
662 | MODULE_PARM_DESC(nosplash, "Disable doing the splash screen"); | |
663 | module_param(arcfb_enable, uint, 0); | |
664 | MODULE_PARM_DESC(arcfb_enable, "Enable communication with Arc board"); | |
665 | module_param(dio_addr, ulong, 0); | |
666 | MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480"); | |
667 | module_param(cio_addr, ulong, 0); | |
668 | MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400"); | |
669 | module_param(c2io_addr, ulong, 0); | |
670 | MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408"); | |
671 | module_param(splashval, ulong, 0); | |
672 | MODULE_PARM_DESC(splashval, "Splash pattern: 0xFF is black, 0x00 is green"); | |
673 | module_param(tuhold, ulong, 0); | |
674 | MODULE_PARM_DESC(tuhold, "Time to hold between strobing data to Arc board"); | |
675 | module_param(irq, uint, 0); | |
676 | MODULE_PARM_DESC(irq, "IRQ for the Arc board"); | |
677 | ||
678 | module_init(arcfb_init); | |
679 | module_exit(arcfb_exit); | |
680 | ||
681 | MODULE_DESCRIPTION("fbdev driver for Arc monochrome LCD board"); | |
682 | MODULE_AUTHOR("Jaya Kumar"); | |
683 | MODULE_LICENSE("GPL"); | |
684 |