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fbmem.c
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fbmem.c
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/*
* linux/drivers/video/fbmem.c
*
* Copyright (C) 1994 Martin Schaller
*
* 2001 - Documented with DocBook
* - Brad Douglas <[email protected]>
*
* 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/linux_logo.h>
#include <linux/proc_fs.h>
#include <linux/console.h>
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif
#include <linux/devfs_fs_kernel.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/efi.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
*/
#define FBPIXMAPSIZE (1024 * 8)
static struct notifier_block *fb_notifier_list;
struct fb_info *registered_fb[FB_MAX];
int num_registered_fb;
/*
* Helpers
*/
int fb_get_color_depth(struct fb_var_screeninfo *var,
struct fb_fix_screeninfo *fix)
{
int depth = 0;
if (fix->visual == FB_VISUAL_MONO01 ||
fix->visual == FB_VISUAL_MONO10)
depth = 1;
else {
if (var->green.length == var->blue.length &&
var->green.length == var->red.length &&
var->green.offset == var->blue.offset &&
var->green.offset == var->red.offset)
depth = var->green.length;
else
depth = var->green.length + var->red.length +
var->blue.length;
}
return depth;
}
EXPORT_SYMBOL(fb_get_color_depth);
/*
* Data padding functions.
*/
void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
{
__fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
}
EXPORT_SYMBOL(fb_pad_aligned_buffer);
void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
u32 shift_high, u32 shift_low, u32 mod)
{
u8 mask = (u8) (0xfff << shift_high), tmp;
int i, j;
for (i = height; i--; ) {
for (j = 0; j < idx; j++) {
tmp = dst[j];
tmp &= mask;
tmp |= *src >> shift_low;
dst[j] = tmp;
tmp = *src << shift_high;
dst[j+1] = tmp;
src++;
}
tmp = dst[idx];
tmp &= mask;
tmp |= *src >> shift_low;
dst[idx] = tmp;
if (shift_high < mod) {
tmp = *src << shift_high;
dst[idx+1] = tmp;
}
src++;
dst += d_pitch;
}
}
EXPORT_SYMBOL(fb_pad_unaligned_buffer);
/*
* we need to lock this section since fb_cursor
* may use fb_imageblit()
*/
char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
{
u32 align = buf->buf_align - 1, offset;
char *addr = buf->addr;
/* If IO mapped, we need to sync before access, no sharing of
* the pixmap is done
*/
if (buf->flags & FB_PIXMAP_IO) {
if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
info->fbops->fb_sync(info);
return addr;
}
/* See if we fit in the remaining pixmap space */
offset = buf->offset + align;
offset &= ~align;
if (offset + size > buf->size) {
/* We do not fit. In order to be able to re-use the buffer,
* we must ensure no asynchronous DMA'ing or whatever operation
* is in progress, we sync for that.
*/
if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
info->fbops->fb_sync(info);
offset = 0;
}
buf->offset = offset + size;
addr += offset;
return addr;
}
#ifdef CONFIG_LOGO
#include <linux/linux_logo.h>
static inline unsigned safe_shift(unsigned d, int n)
{
return n < 0 ? d >> -n : d << n;
}
static void fb_set_logocmap(struct fb_info *info,
const struct linux_logo *logo)
{
struct fb_cmap palette_cmap;
u16 palette_green[16];
u16 palette_blue[16];
u16 palette_red[16];
int i, j, n;
const unsigned char *clut = logo->clut;
palette_cmap.start = 0;
palette_cmap.len = 16;
palette_cmap.red = palette_red;
palette_cmap.green = palette_green;
palette_cmap.blue = palette_blue;
palette_cmap.transp = NULL;
for (i = 0; i < logo->clutsize; i += n) {
n = logo->clutsize - i;
/* palette_cmap provides space for only 16 colors at once */
if (n > 16)
n = 16;
palette_cmap.start = 32 + i;
palette_cmap.len = n;
for (j = 0; j < n; ++j) {
palette_cmap.red[j] = clut[0] << 8 | clut[0];
palette_cmap.green[j] = clut[1] << 8 | clut[1];
palette_cmap.blue[j] = clut[2] << 8 | clut[2];
clut += 3;
}
fb_set_cmap(&palette_cmap, info);
}
}
static void fb_set_logo_truepalette(struct fb_info *info,
const struct linux_logo *logo,
u32 *palette)
{
unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
unsigned char redmask, greenmask, bluemask;
int redshift, greenshift, blueshift;
int i;
const unsigned char *clut = logo->clut;
/*
* We have to create a temporary palette since console palette is only
* 16 colors long.
*/
/* Bug: Doesn't obey msb_right ... (who needs that?) */
redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
redshift = info->var.red.offset - (8 - info->var.red.length);
greenshift = info->var.green.offset - (8 - info->var.green.length);
blueshift = info->var.blue.offset - (8 - info->var.blue.length);
for ( i = 0; i < logo->clutsize; i++) {
palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
safe_shift((clut[1] & greenmask), greenshift) |
safe_shift((clut[2] & bluemask), blueshift));
clut += 3;
}
}
static void fb_set_logo_directpalette(struct fb_info *info,
const struct linux_logo *logo,
u32 *palette)
{
int redshift, greenshift, blueshift;
int i;
redshift = info->var.red.offset;
greenshift = info->var.green.offset;
blueshift = info->var.blue.offset;
for (i = 32; i < logo->clutsize; i++)
palette[i] = i << redshift | i << greenshift | i << blueshift;
}
static void fb_set_logo(struct fb_info *info,
const struct linux_logo *logo, u8 *dst,
int depth)
{
int i, j, k;
const u8 *src = logo->data;
u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
u8 fg = 1, d;
if (fb_get_color_depth(&info->var, &info->fix) == 3)
fg = 7;
if (info->fix.visual == FB_VISUAL_MONO01 ||
info->fix.visual == FB_VISUAL_MONO10)
fg = ~((u8) (0xfff << info->var.green.length));
switch (depth) {
case 4:
for (i = 0; i < logo->height; i++)
for (j = 0; j < logo->width; src++) {
*dst++ = *src >> 4;
j++;
if (j < logo->width) {
*dst++ = *src & 0x0f;
j++;
}
}
break;
case 1:
for (i = 0; i < logo->height; i++) {
for (j = 0; j < logo->width; src++) {
d = *src ^ xor;
for (k = 7; k >= 0; k--) {
*dst++ = ((d >> k) & 1) ? fg : 0;
j++;
}
}
}
break;
}
}
/*
* Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
* linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
* the visual format and color depth of the framebuffer, the DAC, the
* pseudo_palette, and the logo data will be adjusted accordingly.
*
* Case 1 - linux_logo_clut224:
* Color exceeds the number of console colors (16), thus we set the hardware DAC
* using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
*
* For visuals that require color info from the pseudo_palette, we also construct
* one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
* will be set.
*
* Case 2 - linux_logo_vga16:
* The number of colors just matches the console colors, thus there is no need
* to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
* each byte contains color information for two pixels (upper and lower nibble).
* To be consistent with fb_imageblit() usage, we therefore separate the two
* nibbles into separate bytes. The "depth" flag will be set to 4.
*
* Case 3 - linux_logo_mono:
* This is similar with Case 2. Each byte contains information for 8 pixels.
* We isolate each bit and expand each into a byte. The "depth" flag will
* be set to 1.
*/
static struct logo_data {
int depth;
int needs_directpalette;
int needs_truepalette;
int needs_cmapreset;
const struct linux_logo *logo;
} fb_logo;
int fb_prepare_logo(struct fb_info *info)
{
int depth = fb_get_color_depth(&info->var, &info->fix);
memset(&fb_logo, 0, sizeof(struct logo_data));
if (info->flags & FBINFO_MISC_TILEBLITTING)
return 0;
if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
depth = info->var.blue.length;
if (info->var.red.length < depth)
depth = info->var.red.length;
if (info->var.green.length < depth)
depth = info->var.green.length;
}
if (depth >= 8) {
switch (info->fix.visual) {
case FB_VISUAL_TRUECOLOR:
fb_logo.needs_truepalette = 1;
break;
case FB_VISUAL_DIRECTCOLOR:
fb_logo.needs_directpalette = 1;
fb_logo.needs_cmapreset = 1;
break;
case FB_VISUAL_PSEUDOCOLOR:
fb_logo.needs_cmapreset = 1;
break;
}
}
/* Return if no suitable logo was found */
fb_logo.logo = fb_find_logo(depth);
if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
fb_logo.logo = NULL;
return 0;
}
/* What depth we asked for might be different from what we get */
if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
fb_logo.depth = 8;
else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
fb_logo.depth = 4;
else
fb_logo.depth = 1;
return fb_logo.logo->height;
}
int fb_show_logo(struct fb_info *info)
{
u32 *palette = NULL, *saved_pseudo_palette = NULL;
unsigned char *logo_new = NULL;
struct fb_image image;
int x;
/* Return if the frame buffer is not mapped or suspended */
if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
return 0;
image.depth = 8;
image.data = fb_logo.logo->data;
if (fb_logo.needs_cmapreset)
fb_set_logocmap(info, fb_logo.logo);
if (fb_logo.needs_truepalette ||
fb_logo.needs_directpalette) {
palette = kmalloc(256 * 4, GFP_KERNEL);
if (palette == NULL)
return 0;
if (fb_logo.needs_truepalette)
fb_set_logo_truepalette(info, fb_logo.logo, palette);
else
fb_set_logo_directpalette(info, fb_logo.logo, palette);
saved_pseudo_palette = info->pseudo_palette;
info->pseudo_palette = palette;
}
if (fb_logo.depth <= 4) {
logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
GFP_KERNEL);
if (logo_new == NULL) {
kfree(palette);
if (saved_pseudo_palette)
info->pseudo_palette = saved_pseudo_palette;
return 0;
}
image.data = logo_new;
fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
}
image.width = fb_logo.logo->width;
image.height = fb_logo.logo->height;
image.dy = 0;
for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
image.dx = x;
info->fbops->fb_imageblit(info, &image);
}
kfree(palette);
if (saved_pseudo_palette != NULL)
info->pseudo_palette = saved_pseudo_palette;
kfree(logo_new);
return fb_logo.logo->height;
}
#else
int fb_prepare_logo(struct fb_info *info) { return 0; }
int fb_show_logo(struct fb_info *info) { return 0; }
#endif /* CONFIG_LOGO */
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",
(*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 __user *buf, size_t count, loff_t *ppos)
{
unsigned long p = *ppos;
struct inode *inode = file->f_dentry->d_inode;
int fbidx = iminor(inode);
struct fb_info *info = registered_fb[fbidx];
u32 *buffer, *dst;
u32 __iomem *src;
int c, i, cnt = 0, err = 0;
unsigned long total_size;
if (!info || ! info->screen_base)
return -ENODEV;
if (info->state != FBINFO_STATE_RUNNING)
return -EPERM;
if (info->fbops->fb_read)
return info->fbops->fb_read(file, buf, count, ppos);
total_size = info->screen_size;
if (total_size == 0)
total_size = info->fix.smem_len;
if (p >= total_size)
return 0;
if (count >= total_size)
count = total_size;
if (count + p > total_size)
count = total_size - p;
cnt = 0;
buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
GFP_KERNEL);
if (!buffer)
return -ENOMEM;
src = (u32 __iomem *) (info->screen_base + p);
if (info->fbops->fb_sync)
info->fbops->fb_sync(info);
while (count) {
c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
dst = buffer;
for (i = c >> 2; i--; )
*dst++ = fb_readl(src++);
if (c & 3) {
u8 *dst8 = (u8 *) dst;
u8 __iomem *src8 = (u8 __iomem *) src;
for (i = c & 3; i--;)
*dst8++ = fb_readb(src8++);
src = (u32 __iomem *) src8;
}
if (copy_to_user(buf, buffer, c)) {
err = -EFAULT;
break;
}
*ppos += c;
buf += c;
cnt += c;
count -= c;
}
kfree(buffer);
return (err) ? err : cnt;
}
static ssize_t
fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
unsigned long p = *ppos;
struct inode *inode = file->f_dentry->d_inode;
int fbidx = iminor(inode);
struct fb_info *info = registered_fb[fbidx];
u32 *buffer, *src;
u32 __iomem *dst;
int c, i, cnt = 0, err;
unsigned long total_size;
if (!info || !info->screen_base)
return -ENODEV;
if (info->state != FBINFO_STATE_RUNNING)
return -EPERM;
if (info->fbops->fb_write)
return info->fbops->fb_write(file, buf, count, ppos);
total_size = info->screen_size;
if (total_size == 0)
total_size = info->fix.smem_len;
if (p > total_size)
return -ENOSPC;
if (count >= total_size)
count = total_size;
err = 0;
if (count + p > total_size) {
count = total_size - p;
err = -ENOSPC;
}
cnt = 0;
buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
GFP_KERNEL);
if (!buffer)
return -ENOMEM;
dst = (u32 __iomem *) (info->screen_base + p);
if (info->fbops->fb_sync)
info->fbops->fb_sync(info);
while (count) {
c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
src = buffer;
if (copy_from_user(src, buf, c)) {
err = -EFAULT;
break;
}
for (i = c >> 2; i--; )
fb_writel(*src++, dst++);
if (c & 3) {
u8 *src8 = (u8 *) src;
u8 __iomem *dst8 = (u8 __iomem *) dst;
for (i = c & 3; i--; )
fb_writeb(*src8++, dst8++);
dst = (u32 __iomem *) dst8;
}
*ppos += c;
buf += c;
cnt += c;
count -= c;
}
kfree(buffer);
return (err) ? err : cnt;
}
#ifdef CONFIG_KMOD
static void try_to_load(int fb)
{
request_module("fb%d", fb);
}
#endif /* CONFIG_KMOD */
int
fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
{
int xoffset = var->xoffset;
int yoffset = var->yoffset;
int err;
if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
xoffset + info->var.xres > info->var.xres_virtual ||
yoffset + info->var.yres > info->var.yres_virtual)
return -EINVAL;
if ((err = info->fbops->fb_pan_display(var, info)))
return err;
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_info *info, struct fb_var_screeninfo *var)
{
int err, flags = info->flags;
if (var->activate & FB_ACTIVATE_INV_MODE) {
struct fb_videomode mode1, mode2;
int ret = 0;
fb_var_to_videomode(&mode1, var);
fb_var_to_videomode(&mode2, &info->var);
/* make sure we don't delete the videomode of current var */
ret = fb_mode_is_equal(&mode1, &mode2);
if (!ret) {
struct fb_event event;
event.info = info;
event.data = &mode1;
ret = notifier_call_chain(&fb_notifier_list,
FB_EVENT_MODE_DELETE, &event);
}
if (!ret)
fb_delete_videomode(&mode1, &info->modelist);
return ret;
}
if ((var->activate & FB_ACTIVATE_FORCE) ||
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) {
struct fb_videomode mode;
int err = 0;
info->var = *var;
if (info->fbops->fb_set_par)
info->fbops->fb_set_par(info);
fb_pan_display(info, &info->var);
fb_set_cmap(&info->cmap, info);
fb_var_to_videomode(&mode, &info->var);
if (info->modelist.prev && info->modelist.next &&
!list_empty(&info->modelist))
err = fb_add_videomode(&mode, &info->modelist);
if (!err && (flags & FBINFO_MISC_USEREVENT)) {
struct fb_event event;
int evnt = (var->activate & FB_ACTIVATE_ALL) ?
FB_EVENT_MODE_CHANGE_ALL :
FB_EVENT_MODE_CHANGE;
info->flags &= ~FBINFO_MISC_USEREVENT;
event.info = info;
notifier_call_chain(&fb_notifier_list, evnt,
&event);
}
}
}
return 0;
}
int
fb_blank(struct fb_info *info, int blank)
{
int ret = -EINVAL;
if (blank > FB_BLANK_POWERDOWN)
blank = FB_BLANK_POWERDOWN;
if (info->fbops->fb_blank)
ret = info->fbops->fb_blank(blank, info);
if (!ret) {
struct fb_event event;
event.info = info;
event.data = ␣
notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
}
return ret;
}
static int
fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
int fbidx = iminor(inode);
struct fb_info *info = registered_fb[fbidx];
struct fb_ops *fb = info->fbops;
struct fb_var_screeninfo var;
struct fb_fix_screeninfo fix;
struct fb_con2fbmap con2fb;
struct fb_cmap_user cmap;
struct fb_event event;
void __user *argp = (void __user *)arg;
int i;
if (!fb)
return -ENODEV;
switch (cmd) {
case FBIOGET_VSCREENINFO:
return copy_to_user(argp, &info->var,
sizeof(var)) ? -EFAULT : 0;
case FBIOPUT_VSCREENINFO:
if (copy_from_user(&var, argp, sizeof(var)))
return -EFAULT;
acquire_console_sem();
info->flags |= FBINFO_MISC_USEREVENT;
i = fb_set_var(info, &var);
info->flags &= ~FBINFO_MISC_USEREVENT;
release_console_sem();
if (i) return i;
if (copy_to_user(argp, &var, sizeof(var)))
return -EFAULT;
return 0;
case FBIOGET_FSCREENINFO:
return copy_to_user(argp, &info->fix,
sizeof(fix)) ? -EFAULT : 0;
case FBIOPUTCMAP:
if (copy_from_user(&cmap, argp, sizeof(cmap)))
return -EFAULT;
return (fb_set_user_cmap(&cmap, info));
case FBIOGETCMAP:
if (copy_from_user(&cmap, argp, sizeof(cmap)))
return -EFAULT;
return fb_cmap_to_user(&info->cmap, &cmap);
case FBIOPAN_DISPLAY:
if (copy_from_user(&var, argp, sizeof(var)))
return -EFAULT;
acquire_console_sem();
i = fb_pan_display(info, &var);
release_console_sem();
if (i)
return i;
if (copy_to_user(argp, &var, sizeof(var)))
return -EFAULT;
return 0;
case FBIO_CURSOR:
return -EINVAL;
case FBIOGET_CON2FBMAP:
if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
return -EFAULT;
if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
return -EINVAL;
con2fb.framebuffer = -1;
event.info = info;
event.data = &con2fb;
notifier_call_chain(&fb_notifier_list,
FB_EVENT_GET_CONSOLE_MAP, &event);
return copy_to_user(argp, &con2fb,
sizeof(con2fb)) ? -EFAULT : 0;
case FBIOPUT_CON2FBMAP:
if (copy_from_user(&con2fb, argp, 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;
event.info = info;
event.data = &con2fb;
return notifier_call_chain(&fb_notifier_list,
FB_EVENT_SET_CONSOLE_MAP,
&event);
case FBIOBLANK:
acquire_console_sem();
info->flags |= FBINFO_MISC_USEREVENT;
i = fb_blank(info, arg);
info->flags &= ~FBINFO_MISC_USEREVENT;
release_console_sem();
return i;
default:
if (fb->fb_ioctl == NULL)
return -EINVAL;
return fb->fb_ioctl(inode, file, cmd, arg, info);
}
}
#ifdef CONFIG_COMPAT
static long
fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int fbidx = iminor(file->f_dentry->d_inode);
struct fb_info *info = registered_fb[fbidx];
struct fb_ops *fb = info->fbops;
long ret;
if (fb->fb_compat_ioctl == NULL)
return -ENOIOCTLCMD;
lock_kernel();
ret = fb->fb_compat_ioctl(file, cmd, arg, info);
unlock_kernel();
return ret;
}
#endif
static int
fb_mmap(struct file *file, struct vm_area_struct * vma)
{
int fbidx = iminor(file->f_dentry->d_inode);
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 | VM_RESERVED;
#if defined(__sparc_v9__)
if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
vma->vm_end - vma->vm_start, vma->vm_page_prot))
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__)
vma->vm_page_prot = phys_mem_access_prot(file, off,
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
#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__)
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
#elif defined(__hppa__)
pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
#elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
#elif defined(__ia64__)
if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
else
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
#else
#warning What do we have to do here??
#endif
if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
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 = iminor(inode);
struct fb_info *info;
int res = 0;
if (fbidx >= FB_MAX)
return -ENODEV;
#ifdef CONFIG_KMOD
if (!(info = registered_fb[fbidx]))
try_to_load(fbidx);
#endif /* CONFIG_KMOD */
if (!(info = registered_fb[fbidx]))
return -ENODEV;
if (!try_module_get(info->fbops->owner))
return -ENODEV;
if (info->fbops->fb_open) {
res = info->fbops->fb_open(info,1);
if (res)
module_put(info->fbops->owner);
}
return res;
}
static int
fb_release(struct inode *inode, struct file *file)
{
int fbidx = iminor(inode);
struct fb_info *info;
lock_kernel();
info = registered_fb[fbidx];
if (info->fbops->fb_release)
info->fbops->fb_release(info,1);
module_put(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,
#ifdef CONFIG_COMPAT
.compat_ioctl = fb_compat_ioctl,
#endif
.mmap = fb_mmap,
.open = fb_open,