/* * linux/drivers/video/fbmem.c * * Copyright (C) 1994 Martin Schaller * * 2001 - Documented with DocBook * - Brad Douglas <brad@neruo.com> * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. */ #include <linux/config.h> #include <linux/module.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/smp_lock.h> #include <linux/kernel.h> #include <linux/major.h> #include <linux/slab.h> #include <linux/mm.h> #include <linux/mman.h> #include <linux/tty.h> #include <linux/init.h> #include <linux/proc_fs.h> #ifdef CONFIG_KMOD #include <linux/kmod.h> #endif #include <linux/devfs_fs_kernel.h> #if defined(__mc68000__) || defined(CONFIG_APUS) #include <asm/setup.h> #endif #include <asm/io.h> #include <asm/uaccess.h> #include <asm/page.h> #include <asm/pgtable.h> #include <linux/fb.h> /* * Frame buffer device initialization and setup routines */ extern int acornfb_init(void); extern int acornfb_setup(char*); extern int amifb_init(void); extern int amifb_setup(char*); extern int anakinfb_init(void); extern int atafb_init(void); extern int atafb_setup(char*); extern int macfb_init(void); extern int macfb_setup(char*); extern int cyberfb_init(void); extern int cyberfb_setup(char*); extern int pm2fb_init(void); extern int pm2fb_setup(char*); extern int pm3fb_init(void); extern int pm3fb_setup(char*); extern int clps711xfb_init(void); extern int cyber2000fb_init(void); extern int cyber2000fb_setup(char*); extern int retz3fb_init(void); extern int retz3fb_setup(char*); extern int clgenfb_init(void); extern int clgenfb_setup(char*); extern int hitfb_init(void); extern int vfb_init(void); extern int vfb_setup(char*); extern int offb_init(void); extern int atyfb_init(void); extern int atyfb_setup(char*); extern int aty128fb_init(void); extern int aty128fb_setup(char*); extern int neofb_init(void); extern int neofb_setup(char*); extern int igafb_init(void); extern int igafb_setup(char*); extern int imsttfb_init(void); extern int imsttfb_setup(char*); extern int dnfb_init(void); extern int tgafb_init(void); extern int tgafb_setup(char*); extern int virgefb_init(void); extern int virgefb_setup(char*); extern int resolver_video_setup(char*); extern int s3triofb_init(void); extern int vesafb_init(void); extern int vesafb_setup(char*); extern int vga16fb_init(void); extern int vga16fb_setup(char*); extern int hgafb_init(void); extern int hgafb_setup(char*); extern int matroxfb_init(void); extern int matroxfb_setup(char*); extern int hpfb_init(void); extern int sbusfb_init(void); extern int sbusfb_setup(char*); extern int control_init(void); extern int control_setup(char*); extern int platinum_init(void); extern int platinum_setup(char*); extern int valkyriefb_init(void); extern int valkyriefb_setup(char*); extern int chips_init(void); extern int g364fb_init(void); extern int sa1100fb_init(void); extern int fm2fb_init(void); extern int fm2fb_setup(char*); extern int q40fb_init(void); extern int sun3fb_init(void); extern int sun3fb_setup(char *); extern int sgivwfb_init(void); extern int sgivwfb_setup(char*); extern int rivafb_init(void); extern int rivafb_setup(char*); extern int tdfxfb_init(void); extern int tdfxfb_setup(char*); extern int tridentfb_init(void); extern int tridentfb_setup(char*); extern int sisfb_init(void); extern int sisfb_setup(char*); extern int stifb_init(void); extern int stifb_setup(char*); extern int pmagbafb_init(void); extern int pmagbbfb_init(void); extern int maxinefb_init(void); extern int tx3912fb_init(void); extern int tx3912fb_setup(char*); extern int radeonfb_init(void); extern int radeonfb_setup(char*); extern int e1355fb_init(void); extern int e1355fb_setup(char*); extern int pvr2fb_init(void); extern int pvr2fb_setup(char*); extern int sstfb_init(void); extern int sstfb_setup(char*); static struct { const char *name; int (*init)(void); int (*setup)(char*); } fb_drivers[] __initdata = { #ifdef CONFIG_FB_SBUS /* * Sbusfb must be initialized _before_ other frame buffer devices that * use PCI probing */ { "sbus", sbusfb_init, sbusfb_setup }, #endif /* * Chipset specific drivers that use resource management */ #ifdef CONFIG_FB_RETINAZ3 { "retz3", retz3fb_init, retz3fb_setup }, #endif #ifdef CONFIG_FB_AMIGA { "amifb", amifb_init, amifb_setup }, #endif #ifdef CONFIG_FB_ANAKIN { "anakinfb", anakinfb_init, NULL }, #endif #ifdef CONFIG_FB_CLPS711X { "clps711xfb", clps711xfb_init, NULL }, #endif #ifdef CONFIG_FB_CYBER { "cyber", cyberfb_init, cyberfb_setup }, #endif #ifdef CONFIG_FB_CYBER2000 { "cyber2000", cyber2000fb_init, cyber2000fb_setup }, #endif #ifdef CONFIG_FB_PM2 { "pm2fb", pm2fb_init, pm2fb_setup }, #endif #ifdef CONFIG_FB_PM3 { "pm3fb", pm3fb_init, pm3fb_setup }, #endif #ifdef CONFIG_FB_CLGEN { "clgen", clgenfb_init, clgenfb_setup }, #endif #ifdef CONFIG_FB_ATY { "atyfb", atyfb_init, atyfb_setup }, #endif #ifdef CONFIG_FB_MATROX { "matrox", matroxfb_init, matroxfb_setup }, #endif #ifdef CONFIG_FB_ATY128 { "aty128fb", aty128fb_init, aty128fb_setup }, #endif #ifdef CONFIG_FB_NEOMAGIC { "neo", neofb_init, neofb_setup }, #endif #ifdef CONFIG_FB_VIRGE { "virge", virgefb_init, virgefb_setup }, #endif #ifdef CONFIG_FB_RIVA { "riva", rivafb_init, rivafb_setup }, #endif #ifdef CONFIG_FB_RADEON { "radeon", radeonfb_init, radeonfb_setup }, #endif #ifdef CONFIG_FB_CONTROL { "controlfb", control_init, control_setup }, #endif #ifdef CONFIG_FB_PLATINUM { "platinumfb", platinum_init, platinum_setup }, #endif #ifdef CONFIG_FB_VALKYRIE { "valkyriefb", valkyriefb_init, valkyriefb_setup }, #endif #ifdef CONFIG_FB_CT65550 { "chipsfb", chips_init, NULL }, #endif #ifdef CONFIG_FB_IMSTT { "imsttfb", imsttfb_init, imsttfb_setup }, #endif #ifdef CONFIG_FB_S3TRIO { "s3trio", s3triofb_init, NULL }, #endif #ifdef CONFIG_FB_FM2 { "fm2fb", fm2fb_init, fm2fb_setup }, #endif #ifdef CONFIG_FB_SIS { "sisfb", sisfb_init, sisfb_setup }, #endif #ifdef CONFIG_FB_TRIDENT { "trident", tridentfb_init, tridentfb_setup }, #endif /* * Generic drivers that are used as fallbacks * * These depend on resource management and must be initialized * _after_ all other frame buffer devices that use resource * management! */ #ifdef CONFIG_FB_OF { "offb", offb_init, NULL }, #endif #ifdef CONFIG_FB_VESA { "vesa", vesafb_init, vesafb_setup }, #endif /* * Chipset specific drivers that don't use resource management (yet) */ #ifdef CONFIG_FB_3DFX { "tdfx", tdfxfb_init, tdfxfb_setup }, #endif #ifdef CONFIG_FB_SGIVW { "sgivw", sgivwfb_init, sgivwfb_setup }, #endif #ifdef CONFIG_FB_ACORN { "acorn", acornfb_init, acornfb_setup }, #endif #ifdef CONFIG_FB_ATARI { "atafb", atafb_init, atafb_setup }, #endif #ifdef CONFIG_FB_MAC { "macfb", macfb_init, macfb_setup }, #endif #ifdef CONFIG_FB_HGA { "hga", hgafb_init, hgafb_setup }, #endif #ifdef CONFIG_FB_IGA { "igafb", igafb_init, igafb_setup }, #endif #ifdef CONFIG_APOLLO { "apollo", dnfb_init, NULL }, #endif #ifdef CONFIG_FB_Q40 { "q40fb", q40fb_init, NULL }, #endif #ifdef CONFIG_FB_TGA { "tga", tgafb_init, tgafb_setup }, #endif #ifdef CONFIG_FB_HP300 { "hpfb", hpfb_init, NULL }, #endif #ifdef CONFIG_FB_G364 { "g364", g364fb_init, NULL }, #endif #ifdef CONFIG_FB_SA1100 { "sa1100", sa1100fb_init, NULL }, #endif #ifdef CONFIG_FB_SUN3 { "sun3", sun3fb_init, sun3fb_setup }, #endif #ifdef CONFIG_FB_HIT { "hitfb", hitfb_init, NULL }, #endif #ifdef CONFIG_FB_TX3912 { "tx3912", tx3912fb_init, tx3912fb_setup }, #endif #ifdef CONFIG_FB_E1355 { "e1355fb", e1355fb_init, e1355fb_setup }, #endif #ifdef CONFIG_FB_PVR2 { "pvr2", pvr2fb_init, pvr2fb_setup }, #endif #ifdef CONFIG_FB_PMAG_BA { "pmagbafb", pmagbafb_init, NULL }, #endif #ifdef CONFIG_FB_PMAGB_B { "pmagbbfb", pmagbbfb_init, NULL }, #endif #ifdef CONFIG_FB_MAXINE { "maxinefb", maxinefb_init, NULL }, #endif #ifdef CONFIG_FB_VOODOO1 { "sst", sstfb_init, sstfb_setup }, #endif /* * Generic drivers that don't use resource management (yet) */ #ifdef CONFIG_FB_VGA16 { "vga16", vga16fb_init, vga16fb_setup }, #endif #ifdef CONFIG_FB_STI { "stifb", stifb_init, stifb_setup }, #endif #ifdef CONFIG_GSP_RESOLVER /* Not a real frame buffer device... */ { "resolver", NULL, resolver_video_setup }, #endif #ifdef CONFIG_FB_VIRTUAL /* * Vfb must be last to avoid that it becomes your primary display if * other display devices are present */ { "vfb", vfb_init, vfb_setup }, #endif }; #define NUM_FB_DRIVERS (sizeof(fb_drivers)/sizeof(*fb_drivers)) extern const char *global_mode_option; static initcall_t pref_init_funcs[FB_MAX]; static int num_pref_init_funcs __initdata = 0; struct fb_info *registered_fb[FB_MAX]; int num_registered_fb; #ifdef CONFIG_FB_OF static int ofonly __initdata = 0; #endif static int fbmem_read_proc(char *buf, char **start, off_t offset, int len, int *eof, void *private) { struct fb_info **fi; int clen; clen = 0; for (fi = registered_fb; fi < ®istered_fb[FB_MAX] && len < 4000; fi++) if (*fi) clen += sprintf(buf + clen, "%d %s\n", minor((*fi)->node), (*fi)->fix.id); *start = buf + offset; if (clen > offset) clen -= offset; else clen = 0; return clen < len ? clen : len; } static ssize_t fb_read(struct file *file, char *buf, size_t count, loff_t *ppos) { unsigned long p = *ppos; struct inode *inode = file->f_dentry->d_inode; int fbidx = minor(inode->i_rdev); struct fb_info *info = registered_fb[fbidx]; if (!info || ! info->screen_base) return -ENODEV; if (info->fbops->fb_read) return info->fbops->fb_read(file, buf, count, ppos); if (p >= info->fix.smem_len) return 0; if (count >= info->fix.smem_len) count = info->fix.smem_len; if (count + p > info->fix.smem_len) count = info->fix.smem_len - p; if (count) { char *base_addr; base_addr = info->screen_base; count -= copy_to_user(buf, base_addr+p, count); if (!count) return -EFAULT; *ppos += count; } return count; } static ssize_t fb_write(struct file *file, const char *buf, size_t count, loff_t *ppos) { unsigned long p = *ppos; struct inode *inode = file->f_dentry->d_inode; int fbidx = minor(inode->i_rdev); struct fb_info *info = registered_fb[fbidx]; int err; if (!info || !info->screen_base) return -ENODEV; if (info->fbops->fb_write) return info->fbops->fb_write(file, buf, count, ppos); if (p > info->fix.smem_len) return -ENOSPC; if (count >= info->fix.smem_len) count = info->fix.smem_len; err = 0; if (count + p > info->fix.smem_len) { count = info->fix.smem_len - p; err = -ENOSPC; } if (count) { char *base_addr; base_addr = info->screen_base; count -= copy_from_user(base_addr+p, buf, count); *ppos += count; err = -EFAULT; } if (count) return count; return err; } #ifdef CONFIG_KMOD static void try_to_load(int fb) { char modname[16]; sprintf(modname, "fb%d", fb); request_module(modname); } #endif /* CONFIG_KMOD */ int fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info) { int xoffset = var->xoffset; int yoffset = var->yoffset; int err; if (xoffset < 0 || yoffset < 0 || xoffset + info->var.xres > info->var.xres_virtual || yoffset + info->var.yres > info->var.yres_virtual) return -EINVAL; if (info->fbops->fb_pan_display) { if ((err = info->fbops->fb_pan_display(var, info))) return err; else return -EINVAL; } info->var.xoffset = var->xoffset; info->var.yoffset = var->yoffset; if (var->vmode & FB_VMODE_YWRAP) info->var.vmode |= FB_VMODE_YWRAP; else info->var.vmode &= ~FB_VMODE_YWRAP; return 0; } int fb_set_var(struct fb_var_screeninfo *var, struct fb_info *info) { int err; if (memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) { if (!info->fbops->fb_check_var) { *var = info->var; return 0; } if ((err = info->fbops->fb_check_var(var, info))) return err; if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) { info->var = *var; if (info->fbops->fb_set_par) info->fbops->fb_set_par(info); fb_pan_display(&info->var, info); fb_set_cmap(&info->cmap, 1, info); } } return 0; } int fb_blank(int blank, struct fb_info *info) { u16 black[info->cmap.len]; struct fb_cmap cmap; if (info->fbops->fb_blank && !info->fbops->fb_blank(blank, info)) return 0; if (blank) { memset(black, 0, info->cmap.len * sizeof(u16)); cmap.red = cmap.green = cmap.blue = black; if (info->cmap.transp) cmap.transp = black; cmap.start = info->cmap.start; cmap.len = info->cmap.len; } else cmap = info->cmap; return fb_set_cmap(&cmap, 1, info); } static int fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { int fbidx = minor(inode->i_rdev); struct fb_info *info = registered_fb[fbidx]; struct fb_ops *fb = info->fbops; struct fb_var_screeninfo var; struct fb_fix_screeninfo fix; #ifdef CONFIG_FRAMEBUFFER_CONSOLE struct fb_con2fbmap con2fb; #endif struct fb_cmap cmap; int i; if (! fb) return -ENODEV; switch (cmd) { case FBIOGET_VSCREENINFO: return copy_to_user((void *) arg, &info->var, sizeof(var)) ? -EFAULT : 0; case FBIOPUT_VSCREENINFO: if (copy_from_user(&var, (void *) arg, sizeof(var))) return -EFAULT; i = fb_set_var(&var, info); if (i) return i; if (copy_to_user((void *) arg, &var, sizeof(var))) return -EFAULT; return 0; case FBIOGET_FSCREENINFO: return copy_to_user((void *) arg, &info->fix, sizeof(fix)) ? -EFAULT : 0; case FBIOPUTCMAP: if (copy_from_user(&cmap, (void *) arg, sizeof(cmap))) return -EFAULT; return (fb_set_cmap(&cmap, 0, info)); case FBIOGETCMAP: if (copy_from_user(&cmap, (void *) arg, sizeof(cmap))) return -EFAULT; fb_copy_cmap(&info->cmap, &cmap, 0); case FBIOPAN_DISPLAY: if (copy_from_user(&var, (void *) arg, sizeof(var))) return -EFAULT; if ((i = fb_pan_display(&var, info))) return i; if (copy_to_user((void *) arg, &var, sizeof(var))) return -EFAULT; return i; #ifdef CONFIG_FRAMEBUFFER_CONSOLE case FBIOGET_CON2FBMAP: if (copy_from_user(&con2fb, (void *)arg, sizeof(con2fb))) return -EFAULT; if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) return -EINVAL; con2fb.framebuffer = con2fb_map[con2fb.console-1]; return copy_to_user((void *)arg, &con2fb, sizeof(con2fb)) ? -EFAULT : 0; case FBIOPUT_CON2FBMAP: if (copy_from_user(&con2fb, (void *)arg, sizeof(con2fb))) return - EFAULT; if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES) return -EINVAL; if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX) return -EINVAL; #ifdef CONFIG_KMOD if (!registered_fb[con2fb.framebuffer]) try_to_load(con2fb.framebuffer); #endif /* CONFIG_KMOD */ if (!registered_fb[con2fb.framebuffer]) return -EINVAL; if (con2fb.console != 0) set_con2fb_map(con2fb.console-1, con2fb.framebuffer); else /* set them all */ for (i = 0; i < MAX_NR_CONSOLES; i++) set_con2fb_map(i, con2fb.framebuffer); return 0; #endif /* CONFIG_FRAMEBUFFER_CONSOLE */ case FBIOBLANK: return fb_blank(arg, info); default: if (fb->fb_ioctl == NULL) return -EINVAL; return fb->fb_ioctl(inode, file, cmd, arg, info); } } static int fb_mmap(struct file *file, struct vm_area_struct * vma) { int fbidx = minor(file->f_dentry->d_inode->i_rdev); struct fb_info *info = registered_fb[fbidx]; struct fb_ops *fb = info->fbops; unsigned long off; #if !defined(__sparc__) || defined(__sparc_v9__) unsigned long start; u32 len; #endif if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) return -EINVAL; off = vma->vm_pgoff << PAGE_SHIFT; if (!fb) return -ENODEV; if (fb->fb_mmap) { int res; lock_kernel(); res = fb->fb_mmap(info, file, vma); unlock_kernel(); return res; } #if defined(__sparc__) && !defined(__sparc_v9__) /* Should never get here, all fb drivers should have their own mmap routines */ return -EINVAL; #else /* !sparc32... */ lock_kernel(); /* frame buffer memory */ start = info->fix.smem_start; len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len); if (off >= len) { /* memory mapped io */ off -= len; if (info->var.accel_flags) { unlock_kernel(); return -EINVAL; } start = info->fix.mmio_start; len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len); } unlock_kernel(); start &= PAGE_MASK; if ((vma->vm_end - vma->vm_start + off) > len) return -EINVAL; off += start; vma->vm_pgoff = off >> PAGE_SHIFT; /* This is an IO map - tell maydump to skip this VMA */ vma->vm_flags |= VM_IO; #if defined(__sparc_v9__) vma->vm_flags |= (VM_SHM | VM_LOCKED); if (io_remap_page_range(vma, vma->vm_start, off, vma->vm_end - vma->vm_start, vma->vm_page_prot, 0)) return -EAGAIN; #else #if defined(__mc68000__) #if defined(CONFIG_SUN3) pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE; #elif defined(CONFIG_MMU) if (CPU_IS_020_OR_030) pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030; if (CPU_IS_040_OR_060) { pgprot_val(vma->vm_page_prot) &= _CACHEMASK040; /* Use no-cache mode, serialized */ pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S; } #endif #elif defined(__powerpc__) pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE|_PAGE_GUARDED; #elif defined(__alpha__) /* Caching is off in the I/O space quadrant by design. */ #elif defined(__i386__) || defined(__x86_64__) if (boot_cpu_data.x86 > 3) pgprot_val(vma->vm_page_prot) |= _PAGE_PCD; #elif defined(__mips__) pgprot_val(vma->vm_page_prot) &= ~_CACHE_MASK; pgprot_val(vma->vm_page_prot) |= _CACHE_UNCACHED; #elif defined(__arm__) vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); #elif defined(__sh__) pgprot_val(vma->vm_page_prot) &= ~_PAGE_CACHABLE; #elif defined(__ia64__) vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); #else #warning What do we have to do here?? #endif if (io_remap_page_range(vma, vma->vm_start, off, vma->vm_end - vma->vm_start, vma->vm_page_prot)) return -EAGAIN; #endif /* !__sparc_v9__ */ return 0; #endif /* !sparc32 */ } static int fb_open(struct inode *inode, struct file *file) { int fbidx = minor(inode->i_rdev); struct fb_info *info; int res = 0; #ifdef CONFIG_KMOD if (!(info = registered_fb[fbidx])) try_to_load(fbidx); #endif /* CONFIG_KMOD */ if (!(info = registered_fb[fbidx])) return -ENODEV; if (info->fbops->owner) __MOD_INC_USE_COUNT(info->fbops->owner); if (info->fbops->fb_open) { res = info->fbops->fb_open(info,1); if (res && info->fbops->owner) __MOD_DEC_USE_COUNT(info->fbops->owner); } return res; } static int fb_release(struct inode *inode, struct file *file) { int fbidx = minor(inode->i_rdev); struct fb_info *info; lock_kernel(); info = registered_fb[fbidx]; if (info->fbops->fb_release) info->fbops->fb_release(info,1); if (info->fbops->owner) __MOD_DEC_USE_COUNT(info->fbops->owner); unlock_kernel(); return 0; } static struct file_operations fb_fops = { .owner = THIS_MODULE, .read = fb_read, .write = fb_write, .ioctl = fb_ioctl, .mmap = fb_mmap, .open = fb_open, .release = fb_release, #ifdef HAVE_ARCH_FB_UNMAPPED_AREA .get_unmapped_area = get_fb_unmapped_area, #endif }; static devfs_handle_t devfs_handle; /** * register_framebuffer - registers a frame buffer device * @fb_info: frame buffer info structure * * Registers a frame buffer device @fb_info. * * Returns negative errno on error, or zero for success. * */ int register_framebuffer(struct fb_info *fb_info) { #ifdef CONFIG_FRAMEBUFFER_CONSOLE static int fb_ever_opened[FB_MAX]; int j; #endif char name_buf[8]; int i; if (num_registered_fb == FB_MAX) return -ENXIO; num_registered_fb++; for (i = 0 ; i < FB_MAX; i++) if (!registered_fb[i]) break; fb_info->node = mk_kdev(FB_MAJOR, i); fb_info->currcon = -1; registered_fb[i] = fb_info; #ifdef CONFIG_FRAMEBUFFER_CONSOLE if (!fb_ever_opened[i]) { struct module *owner = fb_info->fbops->owner; /* * We assume initial frame buffer devices can be opened this * many times */ for (j = 0; j < MAX_NR_CONSOLES; j++) if (con2fb_map[j] == i) { if (owner) __MOD_INC_USE_COUNT(owner); if (!fb_info->fbops->fb_open) continue; if (!fb_info->fbops->fb_open(fb_info,0)) continue; if (owner) __MOD_DEC_USE_COUNT(owner); } fb_ever_opened[i] = 1; } #endif sprintf (name_buf, "%d", i); fb_info->devfs_handle = devfs_register (devfs_handle, name_buf, DEVFS_FL_DEFAULT, FB_MAJOR, i, S_IFCHR | S_IRUGO | S_IWUGO, &fb_fops, NULL); return 0; } /** * unregister_framebuffer - releases a frame buffer device * @fb_info: frame buffer info structure * * Unregisters a frame buffer device @fb_info. * * Returns negative errno on error, or zero for success. * */ int unregister_framebuffer(struct fb_info *fb_info) { int i, j; i = minor(fb_info->node); #ifdef CONFIG_FRAMEBUFFER_CONSOLE for (j = 0; j < MAX_NR_CONSOLES; j++) if (con2fb_map[j] == i) return -EBUSY; #endif if (!registered_fb[i]) return -EINVAL; devfs_unregister (fb_info->devfs_handle); fb_info->devfs_handle = NULL; devfs_unregister (fb_info->devfs_lhandle); fb_info->devfs_lhandle = NULL; registered_fb[i]=NULL; num_registered_fb--; return 0; } /** * fbmem_init - init frame buffer subsystem * * Initialize the frame buffer subsystem. * * NOTE: This function is _only_ to be called by drivers/char/mem.c. * */ void __init fbmem_init(void) { int i; create_proc_read_entry("fb", 0, 0, fbmem_read_proc, NULL); devfs_handle = devfs_mk_dir (NULL, "fb", NULL); if (register_chrdev(FB_MAJOR,"fb",&fb_fops)) printk("unable to get major %d for fb devs\n", FB_MAJOR); #ifdef CONFIG_FB_OF if (ofonly) { offb_init(); return; } #endif /* * Probe for all builtin frame buffer devices */ for (i = 0; i < num_pref_init_funcs; i++) pref_init_funcs[i](); for (i = 0; i < NUM_FB_DRIVERS; i++) if (fb_drivers[i].init) fb_drivers[i].init(); } /** * video_setup - process command line options * @options: string of options * * Process command line options for frame buffer subsystem. * * NOTE: This function is a __setup and __init function. * * Returns zero. * */ int __init video_setup(char *options) { int i, j; if (!options || !*options) return 0; #ifdef CONFIG_FB_OF if (!strcmp(options, "ofonly")) { ofonly = 1; return 0; } #endif if (num_pref_init_funcs == FB_MAX) return 0; for (i = 0; i < NUM_FB_DRIVERS; i++) { j = strlen(fb_drivers[i].name); if (!strncmp(options, fb_drivers[i].name, j) && options[j] == ':') { if (!strcmp(options+j+1, "off")) fb_drivers[i].init = NULL; else { if (fb_drivers[i].init) { pref_init_funcs[num_pref_init_funcs++] = fb_drivers[i].init; fb_drivers[i].init = NULL; } if (fb_drivers[i].setup) fb_drivers[i].setup(options+j+1); } return 0; } } /* * If we get here no fb was specified. * We consider the argument to be a global video mode option. */ global_mode_option = options; return 0; } __setup("video=", video_setup); /* * Visible symbols for modules */ EXPORT_SYMBOL(register_framebuffer); EXPORT_SYMBOL(unregister_framebuffer); EXPORT_SYMBOL(registered_fb); EXPORT_SYMBOL(num_registered_fb); MODULE_LICENSE("GPL");