Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/video/fbmem.c | |
3 | * | |
4 | * Copyright (C) 1994 Martin Schaller | |
5 | * | |
6 | * 2001 - Documented with DocBook | |
7 | * - Brad Douglas <brad@neruo.com> | |
8 | * | |
9 | * This file is subject to the terms and conditions of the GNU General Public | |
10 | * License. See the file COPYING in the main directory of this archive | |
11 | * for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/module.h> | |
16 | ||
17 | #include <linux/types.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/smp_lock.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/major.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/mman.h> | |
26 | #include <linux/tty.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/linux_logo.h> | |
29 | #include <linux/proc_fs.h> | |
30 | #include <linux/console.h> | |
31 | #ifdef CONFIG_KMOD | |
32 | #include <linux/kmod.h> | |
33 | #endif | |
34 | #include <linux/devfs_fs_kernel.h> | |
35 | #include <linux/err.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/efi.h> | |
39 | ||
40 | #if defined(__mc68000__) || defined(CONFIG_APUS) | |
41 | #include <asm/setup.h> | |
42 | #endif | |
43 | ||
44 | #include <asm/io.h> | |
45 | #include <asm/uaccess.h> | |
46 | #include <asm/page.h> | |
47 | #include <asm/pgtable.h> | |
48 | ||
49 | #include <linux/fb.h> | |
50 | ||
51 | /* | |
52 | * Frame buffer device initialization and setup routines | |
53 | */ | |
54 | ||
55 | #define FBPIXMAPSIZE (1024 * 8) | |
56 | ||
57 | static struct notifier_block *fb_notifier_list; | |
58 | struct fb_info *registered_fb[FB_MAX]; | |
59 | int num_registered_fb; | |
60 | ||
61 | /* | |
62 | * Helpers | |
63 | */ | |
64 | ||
65 | int fb_get_color_depth(struct fb_var_screeninfo *var) | |
66 | { | |
67 | if (var->green.length == var->blue.length && | |
68 | var->green.length == var->red.length && | |
69 | !var->green.offset && !var->blue.offset && | |
70 | !var->red.offset) | |
71 | return var->green.length; | |
72 | else | |
73 | return (var->green.length + var->red.length + | |
74 | var->blue.length); | |
75 | } | |
76 | EXPORT_SYMBOL(fb_get_color_depth); | |
77 | ||
78 | /* | |
f5a9951c | 79 | * Data padding functions. |
1da177e4 | 80 | */ |
f1ab5dac | 81 | void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) |
1da177e4 | 82 | { |
e4c5c820 | 83 | int i, j; |
1da177e4 LT |
84 | |
85 | for (i = height; i--; ) { | |
e4c5c820 AD |
86 | /* s_pitch is a few bytes at the most, memcpy is suboptimal */ |
87 | for (j = 0; j < s_pitch; j++) | |
88 | dst[j] = src[j]; | |
1da177e4 LT |
89 | src += s_pitch; |
90 | dst += d_pitch; | |
91 | } | |
92 | } | |
f1ab5dac | 93 | EXPORT_SYMBOL(fb_pad_aligned_buffer); |
1da177e4 | 94 | |
f1ab5dac JS |
95 | void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, |
96 | u32 shift_high, u32 shift_low, u32 mod) | |
1da177e4 LT |
97 | { |
98 | u8 mask = (u8) (0xfff << shift_high), tmp; | |
99 | int i, j; | |
100 | ||
101 | for (i = height; i--; ) { | |
102 | for (j = 0; j < idx; j++) { | |
103 | tmp = dst[j]; | |
104 | tmp &= mask; | |
105 | tmp |= *src >> shift_low; | |
106 | dst[j] = tmp; | |
107 | tmp = *src << shift_high; | |
108 | dst[j+1] = tmp; | |
109 | src++; | |
110 | } | |
111 | tmp = dst[idx]; | |
112 | tmp &= mask; | |
113 | tmp |= *src >> shift_low; | |
114 | dst[idx] = tmp; | |
115 | if (shift_high < mod) { | |
116 | tmp = *src << shift_high; | |
117 | dst[idx+1] = tmp; | |
118 | } | |
119 | src++; | |
120 | dst += d_pitch; | |
121 | } | |
122 | } | |
f1ab5dac | 123 | EXPORT_SYMBOL(fb_pad_unaligned_buffer); |
1da177e4 LT |
124 | |
125 | /* | |
126 | * we need to lock this section since fb_cursor | |
127 | * may use fb_imageblit() | |
128 | */ | |
129 | char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) | |
130 | { | |
131 | u32 align = buf->buf_align - 1, offset; | |
132 | char *addr = buf->addr; | |
133 | ||
134 | /* If IO mapped, we need to sync before access, no sharing of | |
135 | * the pixmap is done | |
136 | */ | |
137 | if (buf->flags & FB_PIXMAP_IO) { | |
138 | if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) | |
139 | info->fbops->fb_sync(info); | |
140 | return addr; | |
141 | } | |
142 | ||
143 | /* See if we fit in the remaining pixmap space */ | |
144 | offset = buf->offset + align; | |
145 | offset &= ~align; | |
146 | if (offset + size > buf->size) { | |
147 | /* We do not fit. In order to be able to re-use the buffer, | |
148 | * we must ensure no asynchronous DMA'ing or whatever operation | |
149 | * is in progress, we sync for that. | |
150 | */ | |
151 | if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) | |
152 | info->fbops->fb_sync(info); | |
153 | offset = 0; | |
154 | } | |
155 | buf->offset = offset + size; | |
156 | addr += offset; | |
157 | ||
158 | return addr; | |
159 | } | |
160 | ||
161 | #ifdef CONFIG_LOGO | |
162 | #include <linux/linux_logo.h> | |
163 | ||
164 | static inline unsigned safe_shift(unsigned d, int n) | |
165 | { | |
166 | return n < 0 ? d >> -n : d << n; | |
167 | } | |
168 | ||
169 | static void fb_set_logocmap(struct fb_info *info, | |
170 | const struct linux_logo *logo) | |
171 | { | |
172 | struct fb_cmap palette_cmap; | |
173 | u16 palette_green[16]; | |
174 | u16 palette_blue[16]; | |
175 | u16 palette_red[16]; | |
176 | int i, j, n; | |
177 | const unsigned char *clut = logo->clut; | |
178 | ||
179 | palette_cmap.start = 0; | |
180 | palette_cmap.len = 16; | |
181 | palette_cmap.red = palette_red; | |
182 | palette_cmap.green = palette_green; | |
183 | palette_cmap.blue = palette_blue; | |
184 | palette_cmap.transp = NULL; | |
185 | ||
186 | for (i = 0; i < logo->clutsize; i += n) { | |
187 | n = logo->clutsize - i; | |
188 | /* palette_cmap provides space for only 16 colors at once */ | |
189 | if (n > 16) | |
190 | n = 16; | |
191 | palette_cmap.start = 32 + i; | |
192 | palette_cmap.len = n; | |
193 | for (j = 0; j < n; ++j) { | |
194 | palette_cmap.red[j] = clut[0] << 8 | clut[0]; | |
195 | palette_cmap.green[j] = clut[1] << 8 | clut[1]; | |
196 | palette_cmap.blue[j] = clut[2] << 8 | clut[2]; | |
197 | clut += 3; | |
198 | } | |
199 | fb_set_cmap(&palette_cmap, info); | |
200 | } | |
201 | } | |
202 | ||
203 | static void fb_set_logo_truepalette(struct fb_info *info, | |
204 | const struct linux_logo *logo, | |
205 | u32 *palette) | |
206 | { | |
207 | unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; | |
208 | unsigned char redmask, greenmask, bluemask; | |
209 | int redshift, greenshift, blueshift; | |
210 | int i; | |
211 | const unsigned char *clut = logo->clut; | |
212 | ||
213 | /* | |
214 | * We have to create a temporary palette since console palette is only | |
215 | * 16 colors long. | |
216 | */ | |
217 | /* Bug: Doesn't obey msb_right ... (who needs that?) */ | |
218 | redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; | |
219 | greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; | |
220 | bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; | |
221 | redshift = info->var.red.offset - (8 - info->var.red.length); | |
222 | greenshift = info->var.green.offset - (8 - info->var.green.length); | |
223 | blueshift = info->var.blue.offset - (8 - info->var.blue.length); | |
224 | ||
225 | for ( i = 0; i < logo->clutsize; i++) { | |
226 | palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | | |
227 | safe_shift((clut[1] & greenmask), greenshift) | | |
228 | safe_shift((clut[2] & bluemask), blueshift)); | |
229 | clut += 3; | |
230 | } | |
231 | } | |
232 | ||
233 | static void fb_set_logo_directpalette(struct fb_info *info, | |
234 | const struct linux_logo *logo, | |
235 | u32 *palette) | |
236 | { | |
237 | int redshift, greenshift, blueshift; | |
238 | int i; | |
239 | ||
240 | redshift = info->var.red.offset; | |
241 | greenshift = info->var.green.offset; | |
242 | blueshift = info->var.blue.offset; | |
243 | ||
244 | for (i = 32; i < logo->clutsize; i++) | |
245 | palette[i] = i << redshift | i << greenshift | i << blueshift; | |
246 | } | |
247 | ||
248 | static void fb_set_logo(struct fb_info *info, | |
249 | const struct linux_logo *logo, u8 *dst, | |
250 | int depth) | |
251 | { | |
252 | int i, j, k, fg = 1; | |
253 | const u8 *src = logo->data; | |
254 | u8 d, xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; | |
255 | ||
256 | if (fb_get_color_depth(&info->var) == 3) | |
257 | fg = 7; | |
258 | ||
259 | switch (depth) { | |
260 | case 4: | |
261 | for (i = 0; i < logo->height; i++) | |
262 | for (j = 0; j < logo->width; src++) { | |
263 | *dst++ = *src >> 4; | |
264 | j++; | |
265 | if (j < logo->width) { | |
266 | *dst++ = *src & 0x0f; | |
267 | j++; | |
268 | } | |
269 | } | |
270 | break; | |
271 | case 1: | |
272 | for (i = 0; i < logo->height; i++) { | |
273 | for (j = 0; j < logo->width; src++) { | |
274 | d = *src ^ xor; | |
275 | for (k = 7; k >= 0; k--) { | |
276 | *dst++ = ((d >> k) & 1) ? fg : 0; | |
277 | j++; | |
278 | } | |
279 | } | |
280 | } | |
281 | break; | |
282 | } | |
283 | } | |
284 | ||
285 | /* | |
286 | * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), | |
287 | * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on | |
288 | * the visual format and color depth of the framebuffer, the DAC, the | |
289 | * pseudo_palette, and the logo data will be adjusted accordingly. | |
290 | * | |
291 | * Case 1 - linux_logo_clut224: | |
292 | * Color exceeds the number of console colors (16), thus we set the hardware DAC | |
293 | * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. | |
294 | * | |
295 | * For visuals that require color info from the pseudo_palette, we also construct | |
296 | * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags | |
297 | * will be set. | |
298 | * | |
299 | * Case 2 - linux_logo_vga16: | |
300 | * The number of colors just matches the console colors, thus there is no need | |
301 | * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, | |
302 | * each byte contains color information for two pixels (upper and lower nibble). | |
303 | * To be consistent with fb_imageblit() usage, we therefore separate the two | |
304 | * nibbles into separate bytes. The "depth" flag will be set to 4. | |
305 | * | |
306 | * Case 3 - linux_logo_mono: | |
307 | * This is similar with Case 2. Each byte contains information for 8 pixels. | |
308 | * We isolate each bit and expand each into a byte. The "depth" flag will | |
309 | * be set to 1. | |
310 | */ | |
311 | static struct logo_data { | |
312 | int depth; | |
313 | int needs_directpalette; | |
314 | int needs_truepalette; | |
315 | int needs_cmapreset; | |
316 | const struct linux_logo *logo; | |
317 | } fb_logo; | |
318 | ||
319 | int fb_prepare_logo(struct fb_info *info) | |
320 | { | |
321 | int depth = fb_get_color_depth(&info->var); | |
322 | ||
323 | memset(&fb_logo, 0, sizeof(struct logo_data)); | |
324 | ||
325 | if (info->flags & FBINFO_MISC_TILEBLITTING) | |
326 | return 0; | |
327 | ||
328 | if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { | |
329 | depth = info->var.blue.length; | |
330 | if (info->var.red.length < depth) | |
331 | depth = info->var.red.length; | |
332 | if (info->var.green.length < depth) | |
333 | depth = info->var.green.length; | |
334 | } | |
335 | ||
336 | if (depth >= 8) { | |
337 | switch (info->fix.visual) { | |
338 | case FB_VISUAL_TRUECOLOR: | |
339 | fb_logo.needs_truepalette = 1; | |
340 | break; | |
341 | case FB_VISUAL_DIRECTCOLOR: | |
342 | fb_logo.needs_directpalette = 1; | |
343 | fb_logo.needs_cmapreset = 1; | |
344 | break; | |
345 | case FB_VISUAL_PSEUDOCOLOR: | |
346 | fb_logo.needs_cmapreset = 1; | |
347 | break; | |
348 | } | |
349 | } | |
350 | ||
351 | /* Return if no suitable logo was found */ | |
352 | fb_logo.logo = fb_find_logo(depth); | |
353 | ||
354 | if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) { | |
355 | fb_logo.logo = NULL; | |
356 | return 0; | |
357 | } | |
358 | /* What depth we asked for might be different from what we get */ | |
359 | if (fb_logo.logo->type == LINUX_LOGO_CLUT224) | |
360 | fb_logo.depth = 8; | |
361 | else if (fb_logo.logo->type == LINUX_LOGO_VGA16) | |
362 | fb_logo.depth = 4; | |
363 | else | |
364 | fb_logo.depth = 1; | |
365 | return fb_logo.logo->height; | |
366 | } | |
367 | ||
368 | int fb_show_logo(struct fb_info *info) | |
369 | { | |
370 | u32 *palette = NULL, *saved_pseudo_palette = NULL; | |
371 | unsigned char *logo_new = NULL; | |
372 | struct fb_image image; | |
373 | int x; | |
374 | ||
375 | /* Return if the frame buffer is not mapped or suspended */ | |
376 | if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING) | |
377 | return 0; | |
378 | ||
379 | image.depth = 8; | |
380 | image.data = fb_logo.logo->data; | |
381 | ||
382 | if (fb_logo.needs_cmapreset) | |
383 | fb_set_logocmap(info, fb_logo.logo); | |
384 | ||
385 | if (fb_logo.needs_truepalette || | |
386 | fb_logo.needs_directpalette) { | |
387 | palette = kmalloc(256 * 4, GFP_KERNEL); | |
388 | if (palette == NULL) | |
389 | return 0; | |
390 | ||
391 | if (fb_logo.needs_truepalette) | |
392 | fb_set_logo_truepalette(info, fb_logo.logo, palette); | |
393 | else | |
394 | fb_set_logo_directpalette(info, fb_logo.logo, palette); | |
395 | ||
396 | saved_pseudo_palette = info->pseudo_palette; | |
397 | info->pseudo_palette = palette; | |
398 | } | |
399 | ||
400 | if (fb_logo.depth <= 4) { | |
401 | logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height, | |
402 | GFP_KERNEL); | |
403 | if (logo_new == NULL) { | |
404 | kfree(palette); | |
405 | if (saved_pseudo_palette) | |
406 | info->pseudo_palette = saved_pseudo_palette; | |
407 | return 0; | |
408 | } | |
409 | image.data = logo_new; | |
410 | fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth); | |
411 | } | |
412 | ||
413 | image.width = fb_logo.logo->width; | |
414 | image.height = fb_logo.logo->height; | |
415 | image.dy = 0; | |
416 | ||
417 | for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) && | |
418 | x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) { | |
419 | image.dx = x; | |
420 | info->fbops->fb_imageblit(info, &image); | |
421 | } | |
422 | ||
423 | kfree(palette); | |
424 | if (saved_pseudo_palette != NULL) | |
425 | info->pseudo_palette = saved_pseudo_palette; | |
426 | kfree(logo_new); | |
427 | return fb_logo.logo->height; | |
428 | } | |
429 | #else | |
430 | int fb_prepare_logo(struct fb_info *info) { return 0; } | |
431 | int fb_show_logo(struct fb_info *info) { return 0; } | |
432 | #endif /* CONFIG_LOGO */ | |
433 | ||
434 | static int fbmem_read_proc(char *buf, char **start, off_t offset, | |
435 | int len, int *eof, void *private) | |
436 | { | |
437 | struct fb_info **fi; | |
438 | int clen; | |
439 | ||
440 | clen = 0; | |
441 | for (fi = registered_fb; fi < ®istered_fb[FB_MAX] && len < 4000; fi++) | |
442 | if (*fi) | |
443 | clen += sprintf(buf + clen, "%d %s\n", | |
444 | (*fi)->node, | |
445 | (*fi)->fix.id); | |
446 | *start = buf + offset; | |
447 | if (clen > offset) | |
448 | clen -= offset; | |
449 | else | |
450 | clen = 0; | |
451 | return clen < len ? clen : len; | |
452 | } | |
453 | ||
454 | static ssize_t | |
455 | fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
456 | { | |
457 | unsigned long p = *ppos; | |
458 | struct inode *inode = file->f_dentry->d_inode; | |
459 | int fbidx = iminor(inode); | |
460 | struct fb_info *info = registered_fb[fbidx]; | |
461 | u32 *buffer, *dst; | |
462 | u32 __iomem *src; | |
463 | int c, i, cnt = 0, err = 0; | |
464 | unsigned long total_size; | |
465 | ||
466 | if (!info || ! info->screen_base) | |
467 | return -ENODEV; | |
468 | ||
469 | if (info->state != FBINFO_STATE_RUNNING) | |
470 | return -EPERM; | |
471 | ||
472 | if (info->fbops->fb_read) | |
473 | return info->fbops->fb_read(file, buf, count, ppos); | |
474 | ||
475 | total_size = info->screen_size; | |
476 | if (total_size == 0) | |
477 | total_size = info->fix.smem_len; | |
478 | ||
479 | if (p >= total_size) | |
480 | return 0; | |
481 | if (count >= total_size) | |
482 | count = total_size; | |
483 | if (count + p > total_size) | |
484 | count = total_size - p; | |
485 | ||
486 | cnt = 0; | |
487 | buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, | |
488 | GFP_KERNEL); | |
489 | if (!buffer) | |
490 | return -ENOMEM; | |
491 | ||
492 | src = (u32 __iomem *) (info->screen_base + p); | |
493 | ||
494 | if (info->fbops->fb_sync) | |
495 | info->fbops->fb_sync(info); | |
496 | ||
497 | while (count) { | |
498 | c = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
499 | dst = buffer; | |
500 | for (i = c >> 2; i--; ) | |
501 | *dst++ = fb_readl(src++); | |
502 | if (c & 3) { | |
503 | u8 *dst8 = (u8 *) dst; | |
504 | u8 __iomem *src8 = (u8 __iomem *) src; | |
505 | ||
506 | for (i = c & 3; i--;) | |
507 | *dst8++ = fb_readb(src8++); | |
508 | ||
509 | src = (u32 __iomem *) src8; | |
510 | } | |
511 | ||
512 | if (copy_to_user(buf, buffer, c)) { | |
513 | err = -EFAULT; | |
514 | break; | |
515 | } | |
516 | *ppos += c; | |
517 | buf += c; | |
518 | cnt += c; | |
519 | count -= c; | |
520 | } | |
521 | ||
522 | kfree(buffer); | |
523 | return (err) ? err : cnt; | |
524 | } | |
525 | ||
526 | static ssize_t | |
527 | fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
528 | { | |
529 | unsigned long p = *ppos; | |
530 | struct inode *inode = file->f_dentry->d_inode; | |
531 | int fbidx = iminor(inode); | |
532 | struct fb_info *info = registered_fb[fbidx]; | |
533 | u32 *buffer, *src; | |
534 | u32 __iomem *dst; | |
535 | int c, i, cnt = 0, err; | |
536 | unsigned long total_size; | |
537 | ||
538 | if (!info || !info->screen_base) | |
539 | return -ENODEV; | |
540 | ||
541 | if (info->state != FBINFO_STATE_RUNNING) | |
542 | return -EPERM; | |
543 | ||
544 | if (info->fbops->fb_write) | |
545 | return info->fbops->fb_write(file, buf, count, ppos); | |
546 | ||
547 | total_size = info->screen_size; | |
548 | if (total_size == 0) | |
549 | total_size = info->fix.smem_len; | |
550 | ||
551 | if (p > total_size) | |
552 | return -ENOSPC; | |
553 | if (count >= total_size) | |
554 | count = total_size; | |
555 | err = 0; | |
556 | if (count + p > total_size) { | |
557 | count = total_size - p; | |
558 | err = -ENOSPC; | |
559 | } | |
560 | cnt = 0; | |
561 | buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, | |
562 | GFP_KERNEL); | |
563 | if (!buffer) | |
564 | return -ENOMEM; | |
565 | ||
566 | dst = (u32 __iomem *) (info->screen_base + p); | |
567 | ||
568 | if (info->fbops->fb_sync) | |
569 | info->fbops->fb_sync(info); | |
570 | ||
571 | while (count) { | |
572 | c = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
573 | src = buffer; | |
574 | if (copy_from_user(src, buf, c)) { | |
575 | err = -EFAULT; | |
576 | break; | |
577 | } | |
578 | for (i = c >> 2; i--; ) | |
579 | fb_writel(*src++, dst++); | |
580 | if (c & 3) { | |
581 | u8 *src8 = (u8 *) src; | |
582 | u8 __iomem *dst8 = (u8 __iomem *) dst; | |
583 | ||
584 | for (i = c & 3; i--; ) | |
585 | fb_writeb(*src8++, dst8++); | |
586 | ||
587 | dst = (u32 __iomem *) dst8; | |
588 | } | |
589 | *ppos += c; | |
590 | buf += c; | |
591 | cnt += c; | |
592 | count -= c; | |
593 | } | |
594 | kfree(buffer); | |
595 | ||
596 | return (err) ? err : cnt; | |
597 | } | |
598 | ||
599 | #ifdef CONFIG_KMOD | |
600 | static void try_to_load(int fb) | |
601 | { | |
602 | request_module("fb%d", fb); | |
603 | } | |
604 | #endif /* CONFIG_KMOD */ | |
605 | ||
606 | int | |
607 | fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) | |
608 | { | |
609 | int xoffset = var->xoffset; | |
610 | int yoffset = var->yoffset; | |
611 | int err; | |
612 | ||
613 | if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display || | |
614 | xoffset + info->var.xres > info->var.xres_virtual || | |
615 | yoffset + info->var.yres > info->var.yres_virtual) | |
616 | return -EINVAL; | |
617 | if ((err = info->fbops->fb_pan_display(var, info))) | |
618 | return err; | |
619 | info->var.xoffset = var->xoffset; | |
620 | info->var.yoffset = var->yoffset; | |
621 | if (var->vmode & FB_VMODE_YWRAP) | |
622 | info->var.vmode |= FB_VMODE_YWRAP; | |
623 | else | |
624 | info->var.vmode &= ~FB_VMODE_YWRAP; | |
625 | return 0; | |
626 | } | |
627 | ||
628 | int | |
629 | fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) | |
630 | { | |
631 | int err; | |
632 | ||
633 | if (var->activate & FB_ACTIVATE_INV_MODE) { | |
634 | struct fb_videomode mode1, mode2; | |
635 | int ret = 0; | |
636 | ||
637 | fb_var_to_videomode(&mode1, var); | |
638 | fb_var_to_videomode(&mode2, &info->var); | |
639 | /* make sure we don't delete the videomode of current var */ | |
640 | ret = fb_mode_is_equal(&mode1, &mode2); | |
641 | ||
642 | if (!ret) { | |
643 | struct fb_event event; | |
644 | ||
645 | event.info = info; | |
646 | event.data = &mode1; | |
647 | ret = notifier_call_chain(&fb_notifier_list, | |
648 | FB_EVENT_MODE_DELETE, &event); | |
649 | } | |
650 | ||
651 | if (!ret) | |
652 | fb_delete_videomode(&mode1, &info->modelist); | |
653 | ||
654 | return ret; | |
655 | } | |
656 | ||
657 | if ((var->activate & FB_ACTIVATE_FORCE) || | |
658 | memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) { | |
659 | if (!info->fbops->fb_check_var) { | |
660 | *var = info->var; | |
661 | return 0; | |
662 | } | |
663 | ||
664 | if ((err = info->fbops->fb_check_var(var, info))) | |
665 | return err; | |
666 | ||
667 | if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) { | |
668 | struct fb_videomode mode; | |
669 | int err = 0; | |
670 | ||
671 | info->var = *var; | |
672 | if (info->fbops->fb_set_par) | |
673 | info->fbops->fb_set_par(info); | |
674 | ||
675 | fb_pan_display(info, &info->var); | |
676 | ||
677 | fb_set_cmap(&info->cmap, info); | |
678 | ||
679 | fb_var_to_videomode(&mode, &info->var); | |
680 | ||
681 | if (info->modelist.prev && info->modelist.next && | |
682 | !list_empty(&info->modelist)) | |
683 | err = fb_add_videomode(&mode, &info->modelist); | |
684 | ||
685 | if (!err && info->flags & FBINFO_MISC_USEREVENT) { | |
686 | struct fb_event event; | |
687 | ||
688 | info->flags &= ~FBINFO_MISC_USEREVENT; | |
689 | event.info = info; | |
690 | notifier_call_chain(&fb_notifier_list, | |
691 | FB_EVENT_MODE_CHANGE, | |
692 | &event); | |
693 | } | |
694 | } | |
695 | } | |
696 | return 0; | |
697 | } | |
698 | ||
699 | int | |
700 | fb_blank(struct fb_info *info, int blank) | |
701 | { | |
702 | int ret = -EINVAL; | |
703 | ||
704 | if (blank > FB_BLANK_POWERDOWN) | |
705 | blank = FB_BLANK_POWERDOWN; | |
706 | ||
707 | if (info->fbops->fb_blank) | |
708 | ret = info->fbops->fb_blank(blank, info); | |
709 | ||
710 | if (!ret) { | |
711 | struct fb_event event; | |
712 | ||
713 | event.info = info; | |
714 | event.data = ␣ | |
715 | notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event); | |
716 | } | |
717 | ||
718 | return ret; | |
719 | } | |
720 | ||
721 | static int | |
722 | fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
723 | unsigned long arg) | |
724 | { | |
725 | int fbidx = iminor(inode); | |
726 | struct fb_info *info = registered_fb[fbidx]; | |
727 | struct fb_ops *fb = info->fbops; | |
728 | struct fb_var_screeninfo var; | |
729 | struct fb_fix_screeninfo fix; | |
730 | struct fb_con2fbmap con2fb; | |
731 | struct fb_cmap_user cmap; | |
732 | struct fb_event event; | |
733 | void __user *argp = (void __user *)arg; | |
734 | int i; | |
735 | ||
736 | if (!fb) | |
737 | return -ENODEV; | |
738 | switch (cmd) { | |
739 | case FBIOGET_VSCREENINFO: | |
740 | return copy_to_user(argp, &info->var, | |
741 | sizeof(var)) ? -EFAULT : 0; | |
742 | case FBIOPUT_VSCREENINFO: | |
743 | if (copy_from_user(&var, argp, sizeof(var))) | |
744 | return -EFAULT; | |
745 | acquire_console_sem(); | |
746 | info->flags |= FBINFO_MISC_USEREVENT; | |
747 | i = fb_set_var(info, &var); | |
748 | info->flags &= ~FBINFO_MISC_USEREVENT; | |
749 | release_console_sem(); | |
750 | if (i) return i; | |
751 | if (copy_to_user(argp, &var, sizeof(var))) | |
752 | return -EFAULT; | |
753 | return 0; | |
754 | case FBIOGET_FSCREENINFO: | |
755 | return copy_to_user(argp, &info->fix, | |
756 | sizeof(fix)) ? -EFAULT : 0; | |
757 | case FBIOPUTCMAP: | |
758 | if (copy_from_user(&cmap, argp, sizeof(cmap))) | |
759 | return -EFAULT; | |
760 | return (fb_set_user_cmap(&cmap, info)); | |
761 | case FBIOGETCMAP: | |
762 | if (copy_from_user(&cmap, argp, sizeof(cmap))) | |
763 | return -EFAULT; | |
764 | return fb_cmap_to_user(&info->cmap, &cmap); | |
765 | case FBIOPAN_DISPLAY: | |
766 | if (copy_from_user(&var, argp, sizeof(var))) | |
767 | return -EFAULT; | |
768 | acquire_console_sem(); | |
769 | i = fb_pan_display(info, &var); | |
770 | release_console_sem(); | |
771 | if (i) | |
772 | return i; | |
773 | if (copy_to_user(argp, &var, sizeof(var))) | |
774 | return -EFAULT; | |
775 | return 0; | |
776 | case FBIO_CURSOR: | |
777 | return -EINVAL; | |
778 | case FBIOGET_CON2FBMAP: | |
779 | if (copy_from_user(&con2fb, argp, sizeof(con2fb))) | |
780 | return -EFAULT; | |
781 | if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) | |
782 | return -EINVAL; | |
783 | con2fb.framebuffer = -1; | |
784 | event.info = info; | |
785 | event.data = &con2fb; | |
786 | notifier_call_chain(&fb_notifier_list, | |
787 | FB_EVENT_GET_CONSOLE_MAP, &event); | |
788 | return copy_to_user(argp, &con2fb, | |
789 | sizeof(con2fb)) ? -EFAULT : 0; | |
790 | case FBIOPUT_CON2FBMAP: | |
791 | if (copy_from_user(&con2fb, argp, sizeof(con2fb))) | |
792 | return - EFAULT; | |
793 | if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES) | |
794 | return -EINVAL; | |
795 | if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX) | |
796 | return -EINVAL; | |
797 | #ifdef CONFIG_KMOD | |
798 | if (!registered_fb[con2fb.framebuffer]) | |
799 | try_to_load(con2fb.framebuffer); | |
800 | #endif /* CONFIG_KMOD */ | |
801 | if (!registered_fb[con2fb.framebuffer]) | |
802 | return -EINVAL; | |
803 | event.info = info; | |
804 | event.data = &con2fb; | |
805 | return notifier_call_chain(&fb_notifier_list, | |
806 | FB_EVENT_SET_CONSOLE_MAP, | |
807 | &event); | |
808 | case FBIOBLANK: | |
809 | acquire_console_sem(); | |
810 | info->flags |= FBINFO_MISC_USEREVENT; | |
811 | i = fb_blank(info, arg); | |
812 | info->flags &= ~FBINFO_MISC_USEREVENT; | |
813 | release_console_sem(); | |
814 | return i; | |
815 | default: | |
816 | if (fb->fb_ioctl == NULL) | |
817 | return -EINVAL; | |
818 | return fb->fb_ioctl(inode, file, cmd, arg, info); | |
819 | } | |
820 | } | |
821 | ||
822 | #ifdef CONFIG_COMPAT | |
823 | static long | |
824 | fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
825 | { | |
826 | int fbidx = iminor(file->f_dentry->d_inode); | |
827 | struct fb_info *info = registered_fb[fbidx]; | |
828 | struct fb_ops *fb = info->fbops; | |
829 | long ret; | |
830 | ||
831 | if (fb->fb_compat_ioctl == NULL) | |
832 | return -ENOIOCTLCMD; | |
833 | lock_kernel(); | |
834 | ret = fb->fb_compat_ioctl(file, cmd, arg, info); | |
835 | unlock_kernel(); | |
836 | return ret; | |
837 | } | |
838 | #endif | |
839 | ||
840 | static int | |
841 | fb_mmap(struct file *file, struct vm_area_struct * vma) | |
842 | { | |
843 | int fbidx = iminor(file->f_dentry->d_inode); | |
844 | struct fb_info *info = registered_fb[fbidx]; | |
845 | struct fb_ops *fb = info->fbops; | |
846 | unsigned long off; | |
847 | #if !defined(__sparc__) || defined(__sparc_v9__) | |
848 | unsigned long start; | |
849 | u32 len; | |
850 | #endif | |
851 | ||
852 | if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) | |
853 | return -EINVAL; | |
854 | off = vma->vm_pgoff << PAGE_SHIFT; | |
855 | if (!fb) | |
856 | return -ENODEV; | |
857 | if (fb->fb_mmap) { | |
858 | int res; | |
859 | lock_kernel(); | |
860 | res = fb->fb_mmap(info, file, vma); | |
861 | unlock_kernel(); | |
862 | return res; | |
863 | } | |
864 | ||
865 | #if defined(__sparc__) && !defined(__sparc_v9__) | |
866 | /* Should never get here, all fb drivers should have their own | |
867 | mmap routines */ | |
868 | return -EINVAL; | |
869 | #else | |
870 | /* !sparc32... */ | |
871 | lock_kernel(); | |
872 | ||
873 | /* frame buffer memory */ | |
874 | start = info->fix.smem_start; | |
875 | len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len); | |
876 | if (off >= len) { | |
877 | /* memory mapped io */ | |
878 | off -= len; | |
879 | if (info->var.accel_flags) { | |
880 | unlock_kernel(); | |
881 | return -EINVAL; | |
882 | } | |
883 | start = info->fix.mmio_start; | |
884 | len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len); | |
885 | } | |
886 | unlock_kernel(); | |
887 | start &= PAGE_MASK; | |
888 | if ((vma->vm_end - vma->vm_start + off) > len) | |
889 | return -EINVAL; | |
890 | off += start; | |
891 | vma->vm_pgoff = off >> PAGE_SHIFT; | |
892 | /* This is an IO map - tell maydump to skip this VMA */ | |
893 | vma->vm_flags |= VM_IO | VM_RESERVED; | |
894 | #if defined(__sparc_v9__) | |
895 | if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT, | |
896 | vma->vm_end - vma->vm_start, vma->vm_page_prot)) | |
897 | return -EAGAIN; | |
898 | #else | |
899 | #if defined(__mc68000__) | |
900 | #if defined(CONFIG_SUN3) | |
901 | pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE; | |
902 | #elif defined(CONFIG_MMU) | |
903 | if (CPU_IS_020_OR_030) | |
904 | pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030; | |
905 | if (CPU_IS_040_OR_060) { | |
906 | pgprot_val(vma->vm_page_prot) &= _CACHEMASK040; | |
907 | /* Use no-cache mode, serialized */ | |
908 | pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S; | |
909 | } | |
910 | #endif | |
911 | #elif defined(__powerpc__) | |
912 | vma->vm_page_prot = phys_mem_access_prot(file, off, | |
913 | vma->vm_end - vma->vm_start, | |
914 | vma->vm_page_prot); | |
915 | #elif defined(__alpha__) | |
916 | /* Caching is off in the I/O space quadrant by design. */ | |
917 | #elif defined(__i386__) || defined(__x86_64__) | |
918 | if (boot_cpu_data.x86 > 3) | |
919 | pgprot_val(vma->vm_page_prot) |= _PAGE_PCD; | |
920 | #elif defined(__mips__) | |
921 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
922 | #elif defined(__hppa__) | |
923 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; | |
924 | #elif defined(__arm__) || defined(__sh__) || defined(__m32r__) | |
925 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); | |
926 | #elif defined(__ia64__) | |
927 | if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start)) | |
928 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); | |
929 | else | |
930 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
931 | #else | |
932 | #warning What do we have to do here?? | |
933 | #endif | |
934 | if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT, | |
935 | vma->vm_end - vma->vm_start, vma->vm_page_prot)) | |
936 | return -EAGAIN; | |
937 | #endif /* !__sparc_v9__ */ | |
938 | return 0; | |
939 | #endif /* !sparc32 */ | |
940 | } | |
941 | ||
942 | static int | |
943 | fb_open(struct inode *inode, struct file *file) | |
944 | { | |
945 | int fbidx = iminor(inode); | |
946 | struct fb_info *info; | |
947 | int res = 0; | |
948 | ||
949 | if (fbidx >= FB_MAX) | |
950 | return -ENODEV; | |
951 | #ifdef CONFIG_KMOD | |
952 | if (!(info = registered_fb[fbidx])) | |
953 | try_to_load(fbidx); | |
954 | #endif /* CONFIG_KMOD */ | |
955 | if (!(info = registered_fb[fbidx])) | |
956 | return -ENODEV; | |
957 | if (!try_module_get(info->fbops->owner)) | |
958 | return -ENODEV; | |
959 | if (info->fbops->fb_open) { | |
960 | res = info->fbops->fb_open(info,1); | |
961 | if (res) | |
962 | module_put(info->fbops->owner); | |
963 | } | |
964 | return res; | |
965 | } | |
966 | ||
967 | static int | |
968 | fb_release(struct inode *inode, struct file *file) | |
969 | { | |
970 | int fbidx = iminor(inode); | |
971 | struct fb_info *info; | |
972 | ||
973 | lock_kernel(); | |
974 | info = registered_fb[fbidx]; | |
975 | if (info->fbops->fb_release) | |
976 | info->fbops->fb_release(info,1); | |
977 | module_put(info->fbops->owner); | |
978 | unlock_kernel(); | |
979 | return 0; | |
980 | } | |
981 | ||
982 | static struct file_operations fb_fops = { | |
983 | .owner = THIS_MODULE, | |
984 | .read = fb_read, | |
985 | .write = fb_write, | |
986 | .ioctl = fb_ioctl, | |
987 | #ifdef CONFIG_COMPAT | |
988 | .compat_ioctl = fb_compat_ioctl, | |
989 | #endif | |
990 | .mmap = fb_mmap, | |
991 | .open = fb_open, | |
992 | .release = fb_release, | |
993 | #ifdef HAVE_ARCH_FB_UNMAPPED_AREA | |
994 | .get_unmapped_area = get_fb_unmapped_area, | |
995 | #endif | |
996 | }; | |
997 | ||
56b22935 | 998 | static struct class *fb_class; |
1da177e4 LT |
999 | |
1000 | /** | |
1001 | * register_framebuffer - registers a frame buffer device | |
1002 | * @fb_info: frame buffer info structure | |
1003 | * | |
1004 | * Registers a frame buffer device @fb_info. | |
1005 | * | |
1006 | * Returns negative errno on error, or zero for success. | |
1007 | * | |
1008 | */ | |
1009 | ||
1010 | int | |
1011 | register_framebuffer(struct fb_info *fb_info) | |
1012 | { | |
1013 | int i; | |
1014 | struct fb_event event; | |
1015 | ||
1016 | if (num_registered_fb == FB_MAX) | |
1017 | return -ENXIO; | |
1018 | num_registered_fb++; | |
1019 | for (i = 0 ; i < FB_MAX; i++) | |
1020 | if (!registered_fb[i]) | |
1021 | break; | |
1022 | fb_info->node = i; | |
1023 | ||
56b22935 | 1024 | fb_info->class_device = class_device_create(fb_class, MKDEV(FB_MAJOR, i), |
1da177e4 LT |
1025 | fb_info->device, "fb%d", i); |
1026 | if (IS_ERR(fb_info->class_device)) { | |
1027 | /* Not fatal */ | |
1028 | printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device)); | |
1029 | fb_info->class_device = NULL; | |
1030 | } else | |
1031 | fb_init_class_device(fb_info); | |
1032 | ||
1033 | if (fb_info->pixmap.addr == NULL) { | |
1034 | fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); | |
1035 | if (fb_info->pixmap.addr) { | |
1036 | fb_info->pixmap.size = FBPIXMAPSIZE; | |
1037 | fb_info->pixmap.buf_align = 1; | |
1038 | fb_info->pixmap.scan_align = 1; | |
58a60643 | 1039 | fb_info->pixmap.access_align = 32; |
1da177e4 LT |
1040 | fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; |
1041 | } | |
1042 | } | |
1043 | fb_info->pixmap.offset = 0; | |
1044 | ||
1045 | if (!fb_info->modelist.prev || | |
1046 | !fb_info->modelist.next || | |
1047 | list_empty(&fb_info->modelist)) { | |
1048 | struct fb_videomode mode; | |
1049 | ||
1050 | INIT_LIST_HEAD(&fb_info->modelist); | |
1051 | fb_var_to_videomode(&mode, &fb_info->var); | |
1052 | fb_add_videomode(&mode, &fb_info->modelist); | |
1053 | } | |
1054 | ||
1055 | registered_fb[i] = fb_info; | |
1056 | ||
1057 | devfs_mk_cdev(MKDEV(FB_MAJOR, i), | |
1058 | S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i); | |
1059 | event.info = fb_info; | |
1060 | notifier_call_chain(&fb_notifier_list, | |
1061 | FB_EVENT_FB_REGISTERED, &event); | |
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | ||
1066 | /** | |
1067 | * unregister_framebuffer - releases a frame buffer device | |
1068 | * @fb_info: frame buffer info structure | |
1069 | * | |
1070 | * Unregisters a frame buffer device @fb_info. | |
1071 | * | |
1072 | * Returns negative errno on error, or zero for success. | |
1073 | * | |
1074 | */ | |
1075 | ||
1076 | int | |
1077 | unregister_framebuffer(struct fb_info *fb_info) | |
1078 | { | |
1079 | int i; | |
1080 | ||
1081 | i = fb_info->node; | |
1082 | if (!registered_fb[i]) | |
1083 | return -EINVAL; | |
1084 | devfs_remove("fb/%d", i); | |
1085 | ||
1086 | if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) | |
1087 | kfree(fb_info->pixmap.addr); | |
1088 | fb_destroy_modelist(&fb_info->modelist); | |
1089 | registered_fb[i]=NULL; | |
1090 | num_registered_fb--; | |
1091 | fb_cleanup_class_device(fb_info); | |
56b22935 | 1092 | class_device_destroy(fb_class, MKDEV(FB_MAJOR, i)); |
1da177e4 LT |
1093 | return 0; |
1094 | } | |
1095 | ||
1096 | /** | |
1097 | * fb_register_client - register a client notifier | |
1098 | * @nb: notifier block to callback on events | |
1099 | */ | |
1100 | int fb_register_client(struct notifier_block *nb) | |
1101 | { | |
1102 | return notifier_chain_register(&fb_notifier_list, nb); | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * fb_unregister_client - unregister a client notifier | |
1107 | * @nb: notifier block to callback on events | |
1108 | */ | |
1109 | int fb_unregister_client(struct notifier_block *nb) | |
1110 | { | |
1111 | return notifier_chain_unregister(&fb_notifier_list, nb); | |
1112 | } | |
1113 | ||
1114 | /** | |
1115 | * fb_set_suspend - low level driver signals suspend | |
1116 | * @info: framebuffer affected | |
1117 | * @state: 0 = resuming, !=0 = suspending | |
1118 | * | |
1119 | * This is meant to be used by low level drivers to | |
1120 | * signal suspend/resume to the core & clients. | |
1121 | * It must be called with the console semaphore held | |
1122 | */ | |
1123 | void fb_set_suspend(struct fb_info *info, int state) | |
1124 | { | |
1125 | struct fb_event event; | |
1126 | ||
1127 | event.info = info; | |
1128 | if (state) { | |
1129 | notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event); | |
1130 | info->state = FBINFO_STATE_SUSPENDED; | |
1131 | } else { | |
1132 | info->state = FBINFO_STATE_RUNNING; | |
1133 | notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event); | |
1134 | } | |
1135 | } | |
1136 | ||
1137 | /** | |
1138 | * fbmem_init - init frame buffer subsystem | |
1139 | * | |
1140 | * Initialize the frame buffer subsystem. | |
1141 | * | |
1142 | * NOTE: This function is _only_ to be called by drivers/char/mem.c. | |
1143 | * | |
1144 | */ | |
1145 | ||
1146 | static int __init | |
1147 | fbmem_init(void) | |
1148 | { | |
1149 | create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL); | |
1150 | ||
1151 | devfs_mk_dir("fb"); | |
1152 | if (register_chrdev(FB_MAJOR,"fb",&fb_fops)) | |
1153 | printk("unable to get major %d for fb devs\n", FB_MAJOR); | |
1154 | ||
56b22935 | 1155 | fb_class = class_create(THIS_MODULE, "graphics"); |
1da177e4 LT |
1156 | if (IS_ERR(fb_class)) { |
1157 | printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class)); | |
1158 | fb_class = NULL; | |
1159 | } | |
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | #ifdef MODULE | |
1164 | module_init(fbmem_init); | |
1165 | static void __exit | |
1166 | fbmem_exit(void) | |
1167 | { | |
56b22935 | 1168 | class_destroy(fb_class); |
5a340cce | 1169 | unregister_chrdev(FB_MAJOR, "fb"); |
1da177e4 LT |
1170 | } |
1171 | ||
1172 | module_exit(fbmem_exit); | |
1173 | MODULE_LICENSE("GPL"); | |
1174 | MODULE_DESCRIPTION("Framebuffer base"); | |
1175 | #else | |
1176 | subsys_initcall(fbmem_init); | |
1177 | #endif | |
1178 | ||
1179 | int fb_new_modelist(struct fb_info *info) | |
1180 | { | |
1181 | struct fb_event event; | |
1182 | struct fb_var_screeninfo var = info->var; | |
1183 | struct list_head *pos, *n; | |
1184 | struct fb_modelist *modelist; | |
1185 | struct fb_videomode *m, mode; | |
1186 | int err = 1; | |
1187 | ||
1188 | list_for_each_safe(pos, n, &info->modelist) { | |
1189 | modelist = list_entry(pos, struct fb_modelist, list); | |
1190 | m = &modelist->mode; | |
1191 | fb_videomode_to_var(&var, m); | |
1192 | var.activate = FB_ACTIVATE_TEST; | |
1193 | err = fb_set_var(info, &var); | |
1194 | fb_var_to_videomode(&mode, &var); | |
1195 | if (err || !fb_mode_is_equal(m, &mode)) { | |
1196 | list_del(pos); | |
1197 | kfree(pos); | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | err = 1; | |
1202 | ||
1203 | if (!list_empty(&info->modelist)) { | |
1204 | event.info = info; | |
1205 | err = notifier_call_chain(&fb_notifier_list, | |
1206 | FB_EVENT_NEW_MODELIST, | |
1207 | &event); | |
1208 | } | |
1209 | ||
1210 | return err; | |
1211 | } | |
1212 | ||
1213 | static char *video_options[FB_MAX]; | |
1214 | static int ofonly; | |
1215 | ||
4dc3b16b PP |
1216 | extern const char *global_mode_option; |
1217 | ||
1da177e4 LT |
1218 | /** |
1219 | * fb_get_options - get kernel boot parameters | |
1220 | * @name: framebuffer name as it would appear in | |
1221 | * the boot parameter line | |
1222 | * (video=<name>:<options>) | |
1223 | * @option: the option will be stored here | |
1224 | * | |
1225 | * NOTE: Needed to maintain backwards compatibility | |
1226 | */ | |
1227 | int fb_get_options(char *name, char **option) | |
1228 | { | |
1229 | char *opt, *options = NULL; | |
1230 | int opt_len, retval = 0; | |
1231 | int name_len = strlen(name), i; | |
1232 | ||
1233 | if (name_len && ofonly && strncmp(name, "offb", 4)) | |
1234 | retval = 1; | |
1235 | ||
1236 | if (name_len && !retval) { | |
1237 | for (i = 0; i < FB_MAX; i++) { | |
1238 | if (video_options[i] == NULL) | |
1239 | continue; | |
1240 | opt_len = strlen(video_options[i]); | |
1241 | if (!opt_len) | |
1242 | continue; | |
1243 | opt = video_options[i]; | |
1244 | if (!strncmp(name, opt, name_len) && | |
1245 | opt[name_len] == ':') | |
1246 | options = opt + name_len + 1; | |
1247 | } | |
1248 | } | |
1249 | if (options && !strncmp(options, "off", 3)) | |
1250 | retval = 1; | |
1251 | ||
1252 | if (option) | |
1253 | *option = options; | |
1254 | ||
1255 | return retval; | |
1256 | } | |
1257 | ||
1da177e4 LT |
1258 | /** |
1259 | * video_setup - process command line options | |
1260 | * @options: string of options | |
1261 | * | |
1262 | * Process command line options for frame buffer subsystem. | |
1263 | * | |
1264 | * NOTE: This function is a __setup and __init function. | |
1265 | * It only stores the options. Drivers have to call | |
1266 | * fb_get_options() as necessary. | |
1267 | * | |
1268 | * Returns zero. | |
1269 | * | |
1270 | */ | |
75c96f85 | 1271 | static int __init video_setup(char *options) |
1da177e4 LT |
1272 | { |
1273 | int i, global = 0; | |
1274 | ||
1275 | if (!options || !*options) | |
1276 | global = 1; | |
1277 | ||
1278 | if (!global && !strncmp(options, "ofonly", 6)) { | |
1279 | ofonly = 1; | |
1280 | global = 1; | |
1281 | } | |
1282 | ||
1283 | if (!global && !strstr(options, "fb:")) { | |
1284 | global_mode_option = options; | |
1285 | global = 1; | |
1286 | } | |
1287 | ||
1288 | if (!global) { | |
1289 | for (i = 0; i < FB_MAX; i++) { | |
1290 | if (video_options[i] == NULL) { | |
1291 | video_options[i] = options; | |
1292 | break; | |
1293 | } | |
1294 | ||
1295 | } | |
1296 | } | |
1297 | ||
1298 | return 0; | |
1299 | } | |
1300 | __setup("video=", video_setup); | |
1301 | ||
1302 | /* | |
1303 | * Visible symbols for modules | |
1304 | */ | |
1305 | ||
1306 | EXPORT_SYMBOL(register_framebuffer); | |
1307 | EXPORT_SYMBOL(unregister_framebuffer); | |
1308 | EXPORT_SYMBOL(num_registered_fb); | |
1309 | EXPORT_SYMBOL(registered_fb); | |
1310 | EXPORT_SYMBOL(fb_prepare_logo); | |
1311 | EXPORT_SYMBOL(fb_show_logo); | |
1312 | EXPORT_SYMBOL(fb_set_var); | |
1313 | EXPORT_SYMBOL(fb_blank); | |
1314 | EXPORT_SYMBOL(fb_pan_display); | |
1315 | EXPORT_SYMBOL(fb_get_buffer_offset); | |
1da177e4 LT |
1316 | EXPORT_SYMBOL(fb_set_suspend); |
1317 | EXPORT_SYMBOL(fb_register_client); | |
1318 | EXPORT_SYMBOL(fb_unregister_client); | |
1319 | EXPORT_SYMBOL(fb_get_options); | |
1320 | EXPORT_SYMBOL(fb_new_modelist); | |
1321 | ||
1322 | MODULE_LICENSE("GPL"); |