fbmem.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:23k
- /*
- * 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/mman.h>
- #include <linux/tty.h>
- #include <linux/console.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>
- #include <video/fbcon.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 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 cyber2000fb_init(void);
- 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 void maxinefb_init(void);
- extern int tx3912fb_init(void);
- extern int radeonfb_init(void);
- extern int radeonfb_setup(char*);
- extern int e1355fb_init(void);
- extern int e1355fb_setup(char*);
- extern int au1100fb_init(void);
- extern int au1100fb_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_CYBER
- { "cyber", cyberfb_init, cyberfb_setup },
- #endif
- #ifdef CONFIG_FB_CYBER2000
- { "cyber2000", cyber2000fb_init, NULL },
- #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
- #ifdef CONFIG_FB_VOODOO1
- { "sst", sstfb_init, sstfb_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, NULL },
- #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_AU1100
- { "au1100fb", au1100fb_init, au1100fb_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;
- extern int fbcon_softback_size;
- static int first_fb_vc;
- static int last_fb_vc = MAX_NR_CONSOLES-1;
- static int fbcon_is_default = 1;
- #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 %sn",
- GET_FB_IDX((*fi)->node),
- (*fi)->modename);
- *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 = GET_FB_IDX(inode->i_rdev);
- struct fb_info *info = registered_fb[fbidx];
- struct fb_ops *fb = info->fbops;
- struct fb_fix_screeninfo fix;
- if (! fb || ! info->disp)
- return -ENODEV;
- fb->fb_get_fix(&fix,PROC_CONSOLE(info), info);
- if (p >= fix.smem_len)
- return 0;
- if (count >= fix.smem_len)
- count = fix.smem_len;
- if (count + p > fix.smem_len)
- count = fix.smem_len - p;
- if (count) {
- char *base_addr;
- base_addr = info->disp->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 = GET_FB_IDX(inode->i_rdev);
- struct fb_info *info = registered_fb[fbidx];
- struct fb_ops *fb = info->fbops;
- struct fb_fix_screeninfo fix;
- int err;
- if (! fb || ! info->disp)
- return -ENODEV;
- fb->fb_get_fix(&fix, PROC_CONSOLE(info), info);
- if (p > fix.smem_len)
- return -ENOSPC;
- if (count >= fix.smem_len)
- count = fix.smem_len;
- err = 0;
- if (count + p > fix.smem_len) {
- count = fix.smem_len - p;
- err = -ENOSPC;
- }
- if (count) {
- char *base_addr;
- base_addr = info->disp->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 */
- static int
- fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
- {
- int fbidx = GET_FB_IDX(inode->i_rdev);
- struct fb_info *info = registered_fb[fbidx];
- struct fb_ops *fb = info->fbops;
- struct fb_cmap cmap;
- struct fb_var_screeninfo var;
- struct fb_fix_screeninfo fix;
- struct fb_con2fbmap con2fb;
- int i;
-
- if (! fb)
- return -ENODEV;
- switch (cmd) {
- case FBIOGET_VSCREENINFO:
- if ((i = fb->fb_get_var(&var, PROC_CONSOLE(info), info)))
- return i;
- return copy_to_user((void *) arg, &var,
- sizeof(var)) ? -EFAULT : 0;
- case FBIOPUT_VSCREENINFO:
- if (copy_from_user(&var, (void *) arg, sizeof(var)))
- return -EFAULT;
- i = var.activate & FB_ACTIVATE_ALL
- ? set_all_vcs(fbidx, fb, &var, info)
- : fb->fb_set_var(&var, PROC_CONSOLE(info), info);
- if (i)
- return i;
- if (copy_to_user((void *) arg, &var, sizeof(var)))
- return -EFAULT;
- return 0;
- case FBIOGET_FSCREENINFO:
- if ((i = fb->fb_get_fix(&fix, PROC_CONSOLE(info), info)))
- return i;
- return copy_to_user((void *) arg, &fix, sizeof(fix)) ?
- -EFAULT : 0;
- case FBIOPUTCMAP:
- if (copy_from_user(&cmap, (void *) arg, sizeof(cmap)))
- return -EFAULT;
- return (fb->fb_set_cmap(&cmap, 0, PROC_CONSOLE(info), info));
- case FBIOGETCMAP:
- if (copy_from_user(&cmap, (void *) arg, sizeof(cmap)))
- return -EFAULT;
- return (fb->fb_get_cmap(&cmap, 0, PROC_CONSOLE(info), info));
- case FBIOPAN_DISPLAY:
- if (copy_from_user(&var, (void *) arg, sizeof(var)))
- return -EFAULT;
- if (fb->fb_pan_display == NULL)
- return (var.xoffset || var.yoffset) ? -EINVAL : 0;
- if ((i=fb->fb_pan_display(&var, PROC_CONSOLE(info), info)))
- return i;
- if (copy_to_user((void *) arg, &var, sizeof(var)))
- return -EFAULT;
- return i;
- 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;
- case FBIOBLANK:
- if (info->blank == 0)
- return -EINVAL;
- (*info->blank)(arg, info);
- return 0;
- default:
- if (fb->fb_ioctl == NULL)
- return -EINVAL;
- return fb->fb_ioctl(inode, file, cmd, arg, PROC_CONSOLE(info),
- info);
- }
- }
- static int
- fb_mmap(struct file *file, struct vm_area_struct * vma)
- {
- int fbidx = GET_FB_IDX(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__)
- struct fb_fix_screeninfo fix;
- struct fb_var_screeninfo var;
- 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();
- /* This is an IO map - tell maydump to skip this VMA */
- vma->vm_flags |= VM_IO;
- 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();
- fb->fb_get_fix(&fix, PROC_CONSOLE(info), info);
- /* frame buffer memory */
- start = fix.smem_start;
- len = PAGE_ALIGN((start & ~PAGE_MASK)+fix.smem_len);
- if (off >= len) {
- /* memory mapped io */
- off -= len;
- fb->fb_get_var(&var, PROC_CONSOLE(info), info);
- if (var.accel_flags) {
- unlock_kernel();
- return -EINVAL;
- }
- start = fix.mmio_start;
- len = PAGE_ALIGN((start & ~PAGE_MASK)+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->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;
- #else
- 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(__arm__) || defined(__mips__)
- 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);
- #elif defined(__hppa__)
- pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
- #else
- #warning What do we have to do here??
- #endif
- if (io_remap_page_range(vma->vm_start, off,
- vma->vm_end - vma->vm_start, vma->vm_page_prot))
- return -EAGAIN;
- #endif /* !__sparc_v9__ */
- return 0;
- #endif /* !sparc32 */
- }
- #if 1 /* to go away in 2.5.0 */
- int GET_FB_IDX(kdev_t rdev)
- {
- int fbidx = MINOR(rdev);
- if (fbidx >= 32) {
- int newfbidx = fbidx >> 5;
- static int warned;
- if (!(warned & (1<<newfbidx))) {
- warned |= 1<<newfbidx;
- printk("Warning: Remapping obsolete /dev/fb* minor %d to %dn",
- fbidx, newfbidx);
- }
- fbidx = newfbidx;
- }
- return fbidx;
- }
- #endif
- static int
- fb_open(struct inode *inode, struct file *file)
- {
- int fbidx = GET_FB_IDX(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 = GET_FB_IDX(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)
- {
- int i, j;
- char name_buf[8];
- static int fb_ever_opened[FB_MAX];
- static int first = 1;
- 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 = MKDEV(FB_MAJOR, i);
- registered_fb[i] = fb_info;
- 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;
- }
- if (first) {
- first = 0;
- take_over_console(&fb_con, first_fb_vc, last_fb_vc, fbcon_is_default);
- }
- 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 = GET_FB_IDX(fb_info->node);
- for (j = 0; j < MAX_NR_CONSOLES; j++)
- if (con2fb_map[j] == i)
- return -EBUSY;
- 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 (devfs_register_chrdev(FB_MAJOR,"fb",&fb_fops))
- printk("unable to get major %d for fb devsn", 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;
-
- if (!strncmp(options, "scrollback:", 11)) {
- options += 11;
- if (*options) {
- fbcon_softback_size = simple_strtoul(options, &options, 0);
- if (*options == 'k' || *options == 'K') {
- fbcon_softback_size *= 1024;
- options++;
- }
- if (*options != ',')
- return 0;
- options++;
- } else
- return 0;
- }
- if (!strncmp(options, "map:", 4)) {
- options += 4;
- if (*options)
- for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
- if (!options[j])
- j = 0;
- con2fb_map[i] = (options[j++]-'0') % FB_MAX;
- }
- return 0;
- }
-
- if (!strncmp(options, "vc:", 3)) {
- options += 3;
- if (*options)
- first_fb_vc = simple_strtoul(options, &options, 10) - 1;
- if (first_fb_vc < 0)
- first_fb_vc = 0;
- if (*options++ == '-')
- last_fb_vc = simple_strtoul(options, &options, 10) - 1;
- fbcon_is_default = 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);
- #if 1 /* to go away in 2.5.0 */
- EXPORT_SYMBOL(GET_FB_IDX);
- #endif
- MODULE_LICENSE("GPL");