2 * linux/drivers/video/fbmem.c
4 * Copyright (C) 1994 Martin Schaller
6 * 2001 - Documented with DocBook
7 * - Brad Douglas <brad@neruo.com>
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
14 #include <linux/console.h>
15 #include <linux/export.h>
17 #include <linux/fbcon.h>
19 #include <video/nomodeset.h>
21 #include "fb_internal.h"
24 * Frame buffer device initialization and setup routines
27 #define FBPIXMAPSIZE (1024 * 8)
29 struct class *fb_class;
31 DEFINE_MUTEX(registration_lock);
32 struct fb_info *registered_fb[FB_MAX] __read_mostly;
33 int num_registered_fb __read_mostly;
34 #define for_each_registered_fb(i) \
35 for (i = 0; i < FB_MAX; i++) \
36 if (!registered_fb[i]) {} else
38 struct fb_info *get_fb_info(unsigned int idx)
40 struct fb_info *fb_info;
43 return ERR_PTR(-ENODEV);
45 mutex_lock(®istration_lock);
46 fb_info = registered_fb[idx];
48 refcount_inc(&fb_info->count);
49 mutex_unlock(®istration_lock);
54 void put_fb_info(struct fb_info *fb_info)
56 if (!refcount_dec_and_test(&fb_info->count))
58 if (fb_info->fbops->fb_destroy)
59 fb_info->fbops->fb_destroy(fb_info);
66 int fb_get_color_depth(struct fb_var_screeninfo *var,
67 struct fb_fix_screeninfo *fix)
71 if (fix->visual == FB_VISUAL_MONO01 ||
72 fix->visual == FB_VISUAL_MONO10)
75 if (var->green.length == var->blue.length &&
76 var->green.length == var->red.length &&
77 var->green.offset == var->blue.offset &&
78 var->green.offset == var->red.offset)
79 depth = var->green.length;
81 depth = var->green.length + var->red.length +
87 EXPORT_SYMBOL(fb_get_color_depth);
90 * Data padding functions.
92 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
94 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
96 EXPORT_SYMBOL(fb_pad_aligned_buffer);
98 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
99 u32 shift_high, u32 shift_low, u32 mod)
101 u8 mask = (u8) (0xfff << shift_high), tmp;
104 for (i = height; i--; ) {
105 for (j = 0; j < idx; j++) {
108 tmp |= *src >> shift_low;
110 tmp = *src << shift_high;
116 tmp |= *src >> shift_low;
118 if (shift_high < mod) {
119 tmp = *src << shift_high;
126 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
129 * we need to lock this section since fb_cursor
130 * may use fb_imageblit()
132 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
134 u32 align = buf->buf_align - 1, offset;
135 char *addr = buf->addr;
137 /* If IO mapped, we need to sync before access, no sharing of
140 if (buf->flags & FB_PIXMAP_IO) {
141 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
142 info->fbops->fb_sync(info);
146 /* See if we fit in the remaining pixmap space */
147 offset = buf->offset + align;
149 if (offset + size > buf->size) {
150 /* We do not fit. In order to be able to re-use the buffer,
151 * we must ensure no asynchronous DMA'ing or whatever operation
152 * is in progress, we sync for that.
154 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
155 info->fbops->fb_sync(info);
158 buf->offset = offset + size;
163 EXPORT_SYMBOL(fb_get_buffer_offset);
166 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
168 struct fb_fix_screeninfo *fix = &info->fix;
169 unsigned int yres = info->var.yres;
172 if (var->yoffset > 0) {
173 if (var->vmode & FB_VMODE_YWRAP) {
174 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
178 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
182 if (var->xoffset > 0 && (!fix->xpanstep ||
183 (var->xoffset % fix->xpanstep)))
186 if (err || !info->fbops->fb_pan_display ||
187 var->yoffset > info->var.yres_virtual - yres ||
188 var->xoffset > info->var.xres_virtual - info->var.xres)
191 if ((err = info->fbops->fb_pan_display(var, info)))
193 info->var.xoffset = var->xoffset;
194 info->var.yoffset = var->yoffset;
195 if (var->vmode & FB_VMODE_YWRAP)
196 info->var.vmode |= FB_VMODE_YWRAP;
198 info->var.vmode &= ~FB_VMODE_YWRAP;
201 EXPORT_SYMBOL(fb_pan_display);
203 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
206 struct fb_blit_caps caps, fbcaps;
209 memset(&caps, 0, sizeof(caps));
210 memset(&fbcaps, 0, sizeof(fbcaps));
211 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
212 fbcon_get_requirement(info, &caps);
213 info->fbops->fb_get_caps(info, &fbcaps, var);
215 if (!bitmap_subset(caps.x, fbcaps.x, FB_MAX_BLIT_WIDTH) ||
216 !bitmap_subset(caps.y, fbcaps.y, FB_MAX_BLIT_HEIGHT) ||
217 (fbcaps.len < caps.len))
224 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
228 struct fb_var_screeninfo old_var;
229 struct fb_videomode mode;
230 struct fb_event event;
233 if (var->activate & FB_ACTIVATE_INV_MODE) {
234 struct fb_videomode mode1, mode2;
236 fb_var_to_videomode(&mode1, var);
237 fb_var_to_videomode(&mode2, &info->var);
238 /* make sure we don't delete the videomode of current var */
239 ret = fb_mode_is_equal(&mode1, &mode2);
241 ret = fbcon_mode_deleted(info, &mode1);
243 fb_delete_videomode(&mode1, &info->modelist);
246 return ret ? -EINVAL : 0;
249 if (!(var->activate & FB_ACTIVATE_FORCE) &&
250 !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
253 activate = var->activate;
255 /* When using FOURCC mode, make sure the red, green, blue and
256 * transp fields are set to 0.
258 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
259 var->grayscale > 1) {
260 if (var->red.offset || var->green.offset ||
261 var->blue.offset || var->transp.offset ||
262 var->red.length || var->green.length ||
263 var->blue.length || var->transp.length ||
264 var->red.msb_right || var->green.msb_right ||
265 var->blue.msb_right || var->transp.msb_right)
269 if (!info->fbops->fb_check_var) {
274 /* bitfill_aligned() assumes that it's at least 8x8 */
275 if (var->xres < 8 || var->yres < 8)
278 /* Too huge resolution causes multiplication overflow. */
279 if (check_mul_overflow(var->xres, var->yres, &unused) ||
280 check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused))
283 ret = info->fbops->fb_check_var(var, info);
288 /* verify that virtual resolution >= physical resolution */
289 if (var->xres_virtual < var->xres ||
290 var->yres_virtual < var->yres) {
291 pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n",
293 var->xres_virtual, var->yres_virtual,
294 var->xres, var->yres);
298 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
301 if (info->fbops->fb_get_caps) {
302 ret = fb_check_caps(info, var, activate);
311 if (info->fbops->fb_set_par) {
312 ret = info->fbops->fb_set_par(info);
316 printk(KERN_WARNING "detected "
318 "error code: %d\n", ret);
323 fb_pan_display(info, &info->var);
324 fb_set_cmap(&info->cmap, info);
325 fb_var_to_videomode(&mode, &info->var);
327 if (info->modelist.prev && info->modelist.next &&
328 !list_empty(&info->modelist))
329 ret = fb_add_videomode(&mode, &info->modelist);
336 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
340 EXPORT_SYMBOL(fb_set_var);
343 fb_blank(struct fb_info *info, int blank)
345 struct fb_event event;
348 if (blank > FB_BLANK_POWERDOWN)
349 blank = FB_BLANK_POWERDOWN;
354 if (info->fbops->fb_blank)
355 ret = info->fbops->fb_blank(blank, info);
358 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
362 EXPORT_SYMBOL(fb_blank);
364 static int fb_check_foreignness(struct fb_info *fi)
366 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
368 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
371 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
373 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
374 #endif /* __BIG_ENDIAN */
376 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
377 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
378 "support this framebuffer\n", fi->fix.id);
380 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
381 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
382 "support this framebuffer\n", fi->fix.id);
389 static int do_register_framebuffer(struct fb_info *fb_info)
392 struct fb_videomode mode;
394 if (fb_check_foreignness(fb_info))
397 if (num_registered_fb == FB_MAX)
401 for (i = 0 ; i < FB_MAX; i++)
402 if (!registered_fb[i])
405 refcount_set(&fb_info->count, 1);
406 mutex_init(&fb_info->lock);
407 mutex_init(&fb_info->mm_lock);
409 fb_device_create(fb_info);
411 if (fb_info->pixmap.addr == NULL) {
412 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
413 if (fb_info->pixmap.addr) {
414 fb_info->pixmap.size = FBPIXMAPSIZE;
415 fb_info->pixmap.buf_align = 1;
416 fb_info->pixmap.scan_align = 1;
417 fb_info->pixmap.access_align = 32;
418 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
421 fb_info->pixmap.offset = 0;
423 if (bitmap_empty(fb_info->pixmap.blit_x, FB_MAX_BLIT_WIDTH))
424 bitmap_fill(fb_info->pixmap.blit_x, FB_MAX_BLIT_WIDTH);
426 if (bitmap_empty(fb_info->pixmap.blit_y, FB_MAX_BLIT_HEIGHT))
427 bitmap_fill(fb_info->pixmap.blit_y, FB_MAX_BLIT_HEIGHT);
429 if (!fb_info->modelist.prev || !fb_info->modelist.next)
430 INIT_LIST_HEAD(&fb_info->modelist);
432 if (fb_info->skip_vt_switch)
433 pm_vt_switch_required(fb_info->device, false);
435 pm_vt_switch_required(fb_info->device, true);
437 fb_var_to_videomode(&mode, &fb_info->var);
438 fb_add_videomode(&mode, &fb_info->modelist);
439 registered_fb[i] = fb_info;
441 #ifdef CONFIG_GUMSTIX_AM200EPD
443 struct fb_event event;
444 event.info = fb_info;
445 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
449 return fbcon_fb_registered(fb_info);
452 static void unbind_console(struct fb_info *fb_info)
454 int i = fb_info->node;
456 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
459 fbcon_fb_unbind(fb_info);
462 static void unlink_framebuffer(struct fb_info *fb_info)
467 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
470 fb_device_destroy(fb_info);
471 pm_vt_switch_unregister(fb_info->device);
472 unbind_console(fb_info);
475 static void do_unregister_framebuffer(struct fb_info *fb_info)
477 unlink_framebuffer(fb_info);
478 if (fb_info->pixmap.addr &&
479 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) {
480 kfree(fb_info->pixmap.addr);
481 fb_info->pixmap.addr = NULL;
484 fb_destroy_modelist(&fb_info->modelist);
485 registered_fb[fb_info->node] = NULL;
487 #ifdef CONFIG_GUMSTIX_AM200EPD
489 struct fb_event event;
490 event.info = fb_info;
491 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
494 fbcon_fb_unregistered(fb_info);
496 /* this may free fb info */
497 put_fb_info(fb_info);
501 * register_framebuffer - registers a frame buffer device
502 * @fb_info: frame buffer info structure
504 * Registers a frame buffer device @fb_info.
506 * Returns negative errno on error, or zero for success.
510 register_framebuffer(struct fb_info *fb_info)
514 mutex_lock(®istration_lock);
515 ret = do_register_framebuffer(fb_info);
516 mutex_unlock(®istration_lock);
520 EXPORT_SYMBOL(register_framebuffer);
523 * unregister_framebuffer - releases a frame buffer device
524 * @fb_info: frame buffer info structure
526 * Unregisters a frame buffer device @fb_info.
528 * Returns negative errno on error, or zero for success.
530 * This function will also notify the framebuffer console
531 * to release the driver.
533 * This is meant to be called within a driver's module_exit()
534 * function. If this is called outside module_exit(), ensure
535 * that the driver implements fb_open() and fb_release() to
536 * check that no processes are using the device.
539 unregister_framebuffer(struct fb_info *fb_info)
541 mutex_lock(®istration_lock);
542 do_unregister_framebuffer(fb_info);
543 mutex_unlock(®istration_lock);
545 EXPORT_SYMBOL(unregister_framebuffer);
548 * fb_set_suspend - low level driver signals suspend
549 * @info: framebuffer affected
550 * @state: 0 = resuming, !=0 = suspending
552 * This is meant to be used by low level drivers to
553 * signal suspend/resume to the core & clients.
554 * It must be called with the console semaphore held
556 void fb_set_suspend(struct fb_info *info, int state)
558 WARN_CONSOLE_UNLOCKED();
561 fbcon_suspended(info);
562 info->state = FBINFO_STATE_SUSPENDED;
564 info->state = FBINFO_STATE_RUNNING;
568 EXPORT_SYMBOL(fb_set_suspend);
570 static int __init fbmem_init(void)
574 fb_class = class_create("graphics");
575 if (IS_ERR(fb_class)) {
576 ret = PTR_ERR(fb_class);
577 pr_err("Unable to create fb class; errno = %d\n", ret);
581 ret = fb_init_procfs();
583 goto err_class_destroy;
585 ret = fb_register_chrdev();
587 goto err_fb_cleanup_procfs;
593 err_fb_cleanup_procfs:
596 class_destroy(fb_class);
603 static void __exit fbmem_exit(void)
606 fb_unregister_chrdev();
608 class_destroy(fb_class);
611 module_init(fbmem_init);
612 module_exit(fbmem_exit);
613 MODULE_LICENSE("GPL");
614 MODULE_DESCRIPTION("Framebuffer base");
616 subsys_initcall(fbmem_init);
619 int fb_new_modelist(struct fb_info *info)
621 struct fb_var_screeninfo var = info->var;
622 struct list_head *pos, *n;
623 struct fb_modelist *modelist;
624 struct fb_videomode *m, mode;
627 list_for_each_safe(pos, n, &info->modelist) {
628 modelist = list_entry(pos, struct fb_modelist, list);
630 fb_videomode_to_var(&var, m);
631 var.activate = FB_ACTIVATE_TEST;
632 err = fb_set_var(info, &var);
633 fb_var_to_videomode(&mode, &var);
634 if (err || !fb_mode_is_equal(m, &mode)) {
640 if (list_empty(&info->modelist))
643 fbcon_new_modelist(info);
648 bool fb_modesetting_disabled(const char *drvname)
650 bool fwonly = video_firmware_drivers_only();
653 pr_warn("Driver %s not loading because of nomodeset parameter\n",
658 EXPORT_SYMBOL(fb_modesetting_disabled);
660 MODULE_LICENSE("GPL");