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linux/drivers/video/fbmem.c
Laurent Pinchart fb21c2f428 fbdev: Add FOURCC-based format configuration API 
This API will be used to support YUV frame buffer formats in a standard
way.

Last but not least, create a much needed fbdev API documentation and
document the format setting APIs.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
2011-12-19 20:07:13 +00:00

1947 lines
45 KiB
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Raw Blame History

/*
* 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/module.h>
#include <linux/compat.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/vt.h>
#include <linux/init.h>
#include <linux/linux_logo.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/console.h>
#include <linux/kmod.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/efi.h>
#include <linux/fb.h>
#include <asm/fb.h>
/*
* Frame buffer device initialization and setup routines
*/
#define FBPIXMAPSIZE (1024 * 8)
static DEFINE_MUTEX(registration_lock);
struct fb_info *registered_fb[FB_MAX] __read_mostly;
int num_registered_fb __read_mostly;
static struct fb_info *get_fb_info(unsigned int idx)
{
struct fb_info *fb_info;
if (idx >= FB_MAX)
return ERR_PTR(-ENODEV);
mutex_lock(&registration_lock);
fb_info = registered_fb[idx];
if (fb_info)
atomic_inc(&fb_info->count);
mutex_unlock(&registration_lock);
return fb_info;
}
static void put_fb_info(struct fb_info *fb_info)
{
if (!atomic_dec_and_test(&fb_info->count))
return;
if (fb_info->fbops->fb_destroy)
fb_info->fbops->fb_destroy(fb_info);
}
int lock_fb_info(struct fb_info *info)
{
mutex_lock(&info->lock);
if (!info->fbops) {
mutex_unlock(&info->lock);
return 0;
}
return 1;
}
EXPORT_SYMBOL(lock_fb_info);
/*
* 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
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)
{
static const unsigned char mask[] = { 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 < 32 + 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;
switch (fb_get_color_depth(&info->var, &info->fix)) {
case 1:
fg = 1;
break;
case 2:
fg = 3;
break;
default:
fg = 7;
break;
}
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 __read_mostly;
static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
{
u32 size = width * height, i;
out += size - 1;
for (i = size; i--; )
*out-- = *in++;
}
static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
{
int i, j, h = height - 1;
for (i = 0; i < height; i++)
for (j = 0; j < width; j++)
out[height * j + h - i] = *in++;
}
static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
{
int i, j, w = width - 1;
for (i = 0; i < height; i++)
for (j = 0; j < width; j++)
out[height * (w - j) + i] = *in++;
}
static void fb_rotate_logo(struct fb_info *info, u8 *dst,
struct fb_image *image, int rotate)
{
u32 tmp;
if (rotate == FB_ROTATE_UD) {
fb_rotate_logo_ud(image->data, dst, image->width,
image->height);
image->dx = info->var.xres - image->width - image->dx;
image->dy = info->var.yres - image->height - image->dy;
} else if (rotate == FB_ROTATE_CW) {
fb_rotate_logo_cw(image->data, dst, image->width,
image->height);
tmp = image->width;
image->width = image->height;
image->height = tmp;
tmp = image->dy;
image->dy = image->dx;
image->dx = info->var.xres - image->width - tmp;
} else if (rotate == FB_ROTATE_CCW) {
fb_rotate_logo_ccw(image->data, dst, image->width,
image->height);
tmp = image->width;
image->width = image->height;
image->height = tmp;
tmp = image->dx;
image->dx = image->dy;
image->dy = info->var.yres - image->height - tmp;
}
image->data = dst;
}
static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
int rotate, unsigned int num)
{
unsigned int x;
if (rotate == FB_ROTATE_UR) {
for (x = 0;
x < num && image->dx + image->width <= info->var.xres;
x++) {
info->fbops->fb_imageblit(info, image);
image->dx += image->width + 8;
}
} else if (rotate == FB_ROTATE_UD) {
for (x = 0; x < num && image->dx >= 0; x++) {
info->fbops->fb_imageblit(info, image);
image->dx -= image->width + 8;
}
} else if (rotate == FB_ROTATE_CW) {
for (x = 0;
x < num && image->dy + image->height <= info->var.yres;
x++) {
info->fbops->fb_imageblit(info, image);
image->dy += image->height + 8;
}
} else if (rotate == FB_ROTATE_CCW) {
for (x = 0; x < num && image->dy >= 0; x++) {
info->fbops->fb_imageblit(info, image);
image->dy -= image->height + 8;
}
}
}
static int fb_show_logo_line(struct fb_info *info, int rotate,
const struct linux_logo *logo, int y,
unsigned int n)
{
u32 *palette = NULL, *saved_pseudo_palette = NULL;
unsigned char *logo_new = NULL, *logo_rotate = NULL;
struct fb_image image;
/* Return if the frame buffer is not mapped or suspended */
if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
info->flags & FBINFO_MODULE)
return 0;
image.depth = 8;
image.data = logo->data;
if (fb_logo.needs_cmapreset)
fb_set_logocmap(info, 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, logo, palette);
else
fb_set_logo_directpalette(info, logo, palette);
saved_pseudo_palette = info->pseudo_palette;
info->pseudo_palette = palette;
}
if (fb_logo.depth <= 4) {
logo_new = kmalloc(logo->width * 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, logo, logo_new, fb_logo.depth);
}
image.dx = 0;
image.dy = y;
image.width = logo->width;
image.height = logo->height;
if (rotate) {
logo_rotate = kmalloc(logo->width *
logo->height, GFP_KERNEL);
if (logo_rotate)
fb_rotate_logo(info, logo_rotate, &image, rotate);
}
fb_do_show_logo(info, &image, rotate, n);
kfree(palette);
if (saved_pseudo_palette != NULL)
info->pseudo_palette = saved_pseudo_palette;
kfree(logo_new);
kfree(logo_rotate);
return logo->height;
}
#ifdef CONFIG_FB_LOGO_EXTRA
#define FB_LOGO_EX_NUM_MAX 10
static struct logo_data_extra {
const struct linux_logo *logo;
unsigned int n;
} fb_logo_ex[FB_LOGO_EX_NUM_MAX];
static unsigned int fb_logo_ex_num;
void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
{
if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
return;
fb_logo_ex[fb_logo_ex_num].logo = logo;
fb_logo_ex[fb_logo_ex_num].n = n;
fb_logo_ex_num++;
}
static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
unsigned int yres)
{
unsigned int i;
/* FIXME: logo_ex supports only truecolor fb. */
if (info->fix.visual != FB_VISUAL_TRUECOLOR)
fb_logo_ex_num = 0;
for (i = 0; i < fb_logo_ex_num; i++) {
if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
fb_logo_ex[i].logo = NULL;
continue;
}
height += fb_logo_ex[i].logo->height;
if (height > yres) {
height -= fb_logo_ex[i].logo->height;
fb_logo_ex_num = i;
break;
}
}
return height;
}
static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
{
unsigned int i;
for (i = 0; i < fb_logo_ex_num; i++)
y += fb_show_logo_line(info, rotate,
fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
return y;
}
#else /* !CONFIG_FB_LOGO_EXTRA */
static inline int fb_prepare_extra_logos(struct fb_info *info,
unsigned int height,
unsigned int yres)
{
return height;
}
static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
{
return y;
}
#endif /* CONFIG_FB_LOGO_EXTRA */
int fb_prepare_logo(struct fb_info *info, int rotate)
{
int depth = fb_get_color_depth(&info->var, &info->fix);
unsigned int yres;
memset(&fb_logo, 0, sizeof(struct logo_data));
if (info->flags & FBINFO_MISC_TILEBLITTING ||
info->flags & FBINFO_MODULE)
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 (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
/* assume console colormap */
depth = 4;
}
/* Return if no suitable logo was found */
fb_logo.logo = fb_find_logo(depth);
if (!fb_logo.logo) {
return 0;
}
if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
yres = info->var.yres;
else
yres = info->var.xres;
if (fb_logo.logo->height > 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;
if (fb_logo.depth > 4 && depth > 4) {
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 fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
}
int fb_show_logo(struct fb_info *info, int rotate)
{
int y;
y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
num_online_cpus());
y = fb_show_extra_logos(info, y, rotate);
return y;
}
#else
int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
#endif /* CONFIG_LOGO */
static void *fb_seq_start(struct seq_file *m, loff_t *pos)
{
mutex_lock(&registration_lock);
return (*pos < FB_MAX) ? pos : NULL;
}
static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
(*pos)++;
return (*pos < FB_MAX) ? pos : NULL;
}
static void fb_seq_stop(struct seq_file *m, void *v)
{
mutex_unlock(&registration_lock);
}
static int fb_seq_show(struct seq_file *m, void *v)
{
int i = *(loff_t *)v;
struct fb_info *fi = registered_fb[i];
if (fi)
seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
return 0;
}
static const struct seq_operations proc_fb_seq_ops = {
.start = fb_seq_start,
.next = fb_seq_next,
.stop = fb_seq_stop,
.show = fb_seq_show,
};
static int proc_fb_open(struct inode *inode, struct file *file)
{
return seq_open(file, &proc_fb_seq_ops);
}
static const struct file_operations fb_proc_fops = {
.owner = THIS_MODULE,
.open = proc_fb_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
/*
* We hold a reference to the fb_info in file->private_data,
* but if the current registered fb has changed, we don't
* actually want to use it.
*
* So look up the fb_info using the inode minor number,
* and just verify it against the reference we have.
*/
static struct fb_info *file_fb_info(struct file *file)
{
struct inode *inode = file->f_path.dentry->d_inode;
int fbidx = iminor(inode);
struct fb_info *info = registered_fb[fbidx];
if (info != file->private_data)
info = NULL;
return info;
}
static ssize_t
fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
unsigned long p = *ppos;
struct fb_info *info = file_fb_info(file);
u8 *buffer, *dst;
u8 __iomem *src;
int c, 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(info, 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;
buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
GFP_KERNEL);
if (!buffer)
return -ENOMEM;
src = (u8 __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;
fb_memcpy_fromfb(dst, src, c);
dst += c;
src += c;
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 fb_info *info = file_fb_info(file);
u8 *buffer, *src;
u8 __iomem *dst;
int c, 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_write)
return info->fbops->fb_write(info, buf, count, ppos);
total_size = info->screen_size;
if (total_size == 0)
total_size = info->fix.smem_len;
if (p > total_size)
return -EFBIG;
if (count > total_size) {
err = -EFBIG;
count = total_size;
}
if (count + p > total_size) {
if (!err)
err = -ENOSPC;
count = total_size - p;
}
buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
GFP_KERNEL);
if (!buffer)
return -ENOMEM;
dst = (u8 __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;
}
fb_memcpy_tofb(dst, src, c);
dst += c;
src += c;
*ppos += c;
buf += c;
cnt += c;
count -= c;
}
kfree(buffer);
return (cnt) ? cnt : err;
}
int
fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
{
struct fb_fix_screeninfo *fix = &info->fix;
unsigned int yres = info->var.yres;
int err = 0;
if (var->yoffset > 0) {
if (var->vmode & FB_VMODE_YWRAP) {
if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
err = -EINVAL;
else
yres = 0;
} else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
err = -EINVAL;
}
if (var->xoffset > 0 && (!fix->xpanstep ||
(var->xoffset % fix->xpanstep)))
err = -EINVAL;
if (err || !info->fbops->fb_pan_display ||
var->yoffset > info->var.yres_virtual - yres ||
var->xoffset > info->var.xres_virtual - info->var.xres)
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;
}
static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
u32 activate)
{
struct fb_event event;
struct fb_blit_caps caps, fbcaps;
int err = 0;
memset(&caps, 0, sizeof(caps));
memset(&fbcaps, 0, sizeof(fbcaps));
caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
event.info = info;
event.data = &caps;
fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
info->fbops->fb_get_caps(info, &fbcaps, var);
if (((fbcaps.x ^ caps.x) & caps.x) ||
((fbcaps.y ^ caps.y) & caps.y) ||
(fbcaps.len < caps.len))
err = -EINVAL;
return err;
}
int
fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
{
int flags = info->flags;
int ret = 0;
if (var->activate & FB_ACTIVATE_INV_MODE) {
struct fb_videomode mode1, mode2;
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 = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
}
if (!ret)
fb_delete_videomode(&mode1, &info->modelist);
ret = (ret) ? -EINVAL : 0;
goto done;
}
if ((var->activate & FB_ACTIVATE_FORCE) ||
memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
u32 activate = var->activate;
/* When using FOURCC mode, make sure the red, green, blue and
* transp fields are set to 0.
*/
if ((info->fix.capabilities & FB_CAP_FOURCC) &&
var->grayscale > 1) {
if (var->red.offset || var->green.offset ||
var->blue.offset || var->transp.offset ||
var->red.length || var->green.length ||
var->blue.length || var->transp.length ||
var->red.msb_right || var->green.msb_right ||
var->blue.msb_right || var->transp.msb_right)
return -EINVAL;
}
if (!info->fbops->fb_check_var) {
*var = info->var;
goto done;
}
ret = info->fbops->fb_check_var(var, info);
if (ret)
goto done;
if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
struct fb_var_screeninfo old_var;
struct fb_videomode mode;
if (info->fbops->fb_get_caps) {
ret = fb_check_caps(info, var, activate);
if (ret)
goto done;
}
old_var = info->var;
info->var = *var;
if (info->fbops->fb_set_par) {
ret = info->fbops->fb_set_par(info);
if (ret) {
info->var = old_var;
printk(KERN_WARNING "detected "
"fb_set_par error, "
"error code: %d\n", ret);
goto done;
}
}
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))
ret = fb_add_videomode(&mode, &info->modelist);
if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
struct fb_event event;
int evnt = (activate & FB_ACTIVATE_ALL) ?
FB_EVENT_MODE_CHANGE_ALL :
FB_EVENT_MODE_CHANGE;
info->flags &= ~FBINFO_MISC_USEREVENT;
event.info = info;
event.data = &mode;
fb_notifier_call_chain(evnt, &event);
}
}
}
done:
return ret;
}
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 = &blank;
fb_notifier_call_chain(FB_EVENT_BLANK, &event);
}
return ret;
}
static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
struct fb_ops *fb;
struct fb_var_screeninfo var;
struct fb_fix_screeninfo fix;
struct fb_con2fbmap con2fb;
struct fb_cmap cmap_from;
struct fb_cmap_user cmap;
struct fb_event event;
void __user *argp = (void __user *)arg;
long ret = 0;
switch (cmd) {
case FBIOGET_VSCREENINFO:
if (!lock_fb_info(info))
return -ENODEV;
var = info->var;
unlock_fb_info(info);
ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
break;
case FBIOPUT_VSCREENINFO:
if (copy_from_user(&var, argp, sizeof(var)))
return -EFAULT;
if (!lock_fb_info(info))
return -ENODEV;
console_lock();
info->flags |= FBINFO_MISC_USEREVENT;
ret = fb_set_var(info, &var);
info->flags &= ~FBINFO_MISC_USEREVENT;
console_unlock();
unlock_fb_info(info);
if (!ret && copy_to_user(argp, &var, sizeof(var)))
ret = -EFAULT;
break;
case FBIOGET_FSCREENINFO:
if (!lock_fb_info(info))
return -ENODEV;
fix = info->fix;
unlock_fb_info(info);
ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
break;
case FBIOPUTCMAP:
if (copy_from_user(&cmap, argp, sizeof(cmap)))
return -EFAULT;
ret = fb_set_user_cmap(&cmap, info);
break;
case FBIOGETCMAP:
if (copy_from_user(&cmap, argp, sizeof(cmap)))
return -EFAULT;
if (!lock_fb_info(info))
return -ENODEV;
cmap_from = info->cmap;
unlock_fb_info(info);
ret = fb_cmap_to_user(&cmap_from, &cmap);
break;
case FBIOPAN_DISPLAY:
if (copy_from_user(&var, argp, sizeof(var)))
return -EFAULT;
if (!lock_fb_info(info))
return -ENODEV;
console_lock();
ret = fb_pan_display(info, &var);
console_unlock();
unlock_fb_info(info);
if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
return -EFAULT;
break;
case FBIO_CURSOR:
ret = -EINVAL;
break;
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.data = &con2fb;
if (!lock_fb_info(info))
return -ENODEV;
event.info = info;
fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
unlock_fb_info(info);
ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
break;
case FBIOPUT_CON2FBMAP:
if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
return -EFAULT;
if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
return -EINVAL;
if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
return -EINVAL;
if (!registered_fb[con2fb.framebuffer])
request_module("fb%d", con2fb.framebuffer);
if (!registered_fb[con2fb.framebuffer]) {
ret = -EINVAL;
break;
}
event.data = &con2fb;
if (!lock_fb_info(info))
return -ENODEV;
event.info = info;
ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
unlock_fb_info(info);
break;
case FBIOBLANK:
if (!lock_fb_info(info))
return -ENODEV;
console_lock();
info->flags |= FBINFO_MISC_USEREVENT;
ret = fb_blank(info, arg);
info->flags &= ~FBINFO_MISC_USEREVENT;
console_unlock();
unlock_fb_info(info);
break;
default:
if (!lock_fb_info(info))
return -ENODEV;
fb = info->fbops;
if (fb->fb_ioctl)
ret = fb->fb_ioctl(info, cmd, arg);
else
ret = -ENOTTY;
unlock_fb_info(info);
}
return ret;
}
static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct fb_info *info = file_fb_info(file);
if (!info)
return -ENODEV;
return do_fb_ioctl(info, cmd, arg);
}
#ifdef CONFIG_COMPAT
struct fb_fix_screeninfo32 {
char id[16];
compat_caddr_t smem_start;
u32 smem_len;
u32 type;
u32 type_aux;
u32 visual;
u16 xpanstep;
u16 ypanstep;
u16 ywrapstep;
u32 line_length;
compat_caddr_t mmio_start;
u32 mmio_len;
u32 accel;
u16 reserved[3];
};
struct fb_cmap32 {
u32 start;
u32 len;
compat_caddr_t red;
compat_caddr_t green;
compat_caddr_t blue;
compat_caddr_t transp;
};
static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
struct fb_cmap_user __user *cmap;
struct fb_cmap32 __user *cmap32;
__u32 data;
int err;
cmap = compat_alloc_user_space(sizeof(*cmap));
cmap32 = compat_ptr(arg);
if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
return -EFAULT;
if (get_user(data, &cmap32->red) ||
put_user(compat_ptr(data), &cmap->red) ||
get_user(data, &cmap32->green) ||
put_user(compat_ptr(data), &cmap->green) ||
get_user(data, &cmap32->blue) ||
put_user(compat_ptr(data), &cmap->blue) ||
get_user(data, &cmap32->transp) ||
put_user(compat_ptr(data), &cmap->transp))
return -EFAULT;
err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
if (!err) {
if (copy_in_user(&cmap32->start,
&cmap->start,
2 * sizeof(__u32)))
err = -EFAULT;
}
return err;
}
static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
struct fb_fix_screeninfo32 __user *fix32)
{
__u32 data;
int err;
err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
data = (__u32) (unsigned long) fix->smem_start;
err |= put_user(data, &fix32->smem_start);
err |= put_user(fix->smem_len, &fix32->smem_len);
err |= put_user(fix->type, &fix32->type);
err |= put_user(fix->type_aux, &fix32->type_aux);
err |= put_user(fix->visual, &fix32->visual);
err |= put_user(fix->xpanstep, &fix32->xpanstep);
err |= put_user(fix->ypanstep, &fix32->ypanstep);
err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
err |= put_user(fix->line_length, &fix32->line_length);
data = (__u32) (unsigned long) fix->mmio_start;
err |= put_user(data, &fix32->mmio_start);
err |= put_user(fix->mmio_len, &fix32->mmio_len);
err |= put_user(fix->accel, &fix32->accel);
err |= copy_to_user(fix32->reserved, fix->reserved,
sizeof(fix->reserved));
return err;
}
static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
mm_segment_t old_fs;
struct fb_fix_screeninfo fix;
struct fb_fix_screeninfo32 __user *fix32;
int err;
fix32 = compat_ptr(arg);
old_fs = get_fs();
set_fs(KERNEL_DS);
err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
set_fs(old_fs);
if (!err)
err = do_fscreeninfo_to_user(&fix, fix32);
return err;
}
static long fb_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct fb_info *info = file_fb_info(file);
struct fb_ops *fb;
long ret = -ENOIOCTLCMD;
if (!info)
return -ENODEV;
fb = info->fbops;
switch(cmd) {
case FBIOGET_VSCREENINFO:
case FBIOPUT_VSCREENINFO:
case FBIOPAN_DISPLAY:
case FBIOGET_CON2FBMAP:
case FBIOPUT_CON2FBMAP:
arg = (unsigned long) compat_ptr(arg);
case FBIOBLANK:
ret = do_fb_ioctl(info, cmd, arg);
break;
case FBIOGET_FSCREENINFO:
ret = fb_get_fscreeninfo(info, cmd, arg);
break;
case FBIOGETCMAP:
case FBIOPUTCMAP:
ret = fb_getput_cmap(info, cmd, arg);
break;
default:
if (fb->fb_compat_ioctl)
ret = fb->fb_compat_ioctl(info, cmd, arg);
break;
}
return ret;
}
#endif
static int
fb_mmap(struct file *file, struct vm_area_struct * vma)
{
struct fb_info *info = file_fb_info(file);
struct fb_ops *fb;
unsigned long off;
unsigned long start;
u32 len;
if (!info)
return -ENODEV;
if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
return -EINVAL;
off = vma->vm_pgoff << PAGE_SHIFT;
fb = info->fbops;
if (!fb)
return -ENODEV;
mutex_lock(&info->mm_lock);
if (fb->fb_mmap) {
int res;
res = fb->fb_mmap(info, vma);
mutex_unlock(&info->mm_lock);
return res;
}
/* 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) {
mutex_unlock(&info->mm_lock);
return -EINVAL;
}
start = info->fix.mmio_start;
len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
}
mutex_unlock(&info->mm_lock);
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;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
fb_pgprotect(file, vma, off);
if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
vma->vm_end - vma->vm_start, vma->vm_page_prot))
return -EAGAIN;
return 0;
}
static int
fb_open(struct inode *inode, struct file *file)
__acquires(&info->lock)
__releases(&info->lock)
{
int fbidx = iminor(inode);
struct fb_info *info;
int res = 0;
info = get_fb_info(fbidx);
if (!info) {
request_module("fb%d", fbidx);
info = get_fb_info(fbidx);
if (!info)
return -ENODEV;
}
if (IS_ERR(info))
return PTR_ERR(info);
mutex_lock(&info->lock);
if (!try_module_get(info->fbops->owner)) {
res = -ENODEV;
goto out;
}
file->private_data = info;
if (info->fbops->fb_open) {
res = info->fbops->fb_open(info,1);
if (res)
module_put(info->fbops->owner);
}
#ifdef CONFIG_FB_DEFERRED_IO
if (info->fbdefio)
fb_deferred_io_open(info, inode, file);
#endif
out:
mutex_unlock(&info->lock);
if (res)
put_fb_info(info);
return res;
}
static int
fb_release(struct inode *inode, struct file *file)
__acquires(&info->lock)
__releases(&info->lock)
{
struct fb_info * const info = file->private_data;
mutex_lock(&info->lock);
if (info->fbops->fb_release)
info->fbops->fb_release(info,1);
module_put(info->fbops->owner);
mutex_unlock(&info->lock);
put_fb_info(info);
return 0;
}
static const struct file_operations fb_fops = {
.owner = THIS_MODULE,
.read = fb_read,
.write = fb_write,
.unlocked_ioctl = fb_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = fb_compat_ioctl,
#endif
.mmap = fb_mmap,
.open = fb_open,
.release = fb_release,
#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
.get_unmapped_area = get_fb_unmapped_area,
#endif
#ifdef CONFIG_FB_DEFERRED_IO
.fsync = fb_deferred_io_fsync,
#endif
.llseek = default_llseek,
};
struct class *fb_class;
EXPORT_SYMBOL(fb_class);
static int fb_check_foreignness(struct fb_info *fi)
{
const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
#ifdef __BIG_ENDIAN
fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
#else
fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
#endif /* __BIG_ENDIAN */
if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
"support this framebuffer\n", fi->fix.id);
return -ENOSYS;
} else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
"support this framebuffer\n", fi->fix.id);
return -ENOSYS;
}
return 0;
}
static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
{
/* is the generic aperture base the same as the HW one */
if (gen->base == hw->base)
return true;
/* is the generic aperture base inside the hw base->hw base+size */
if (gen->base > hw->base && gen->base < hw->base + hw->size)
return true;
return false;
}
static bool fb_do_apertures_overlap(struct apertures_struct *gena,
struct apertures_struct *hwa)
{
int i, j;
if (!hwa || !gena)
return false;
for (i = 0; i < hwa->count; ++i) {
struct aperture *h = &hwa->ranges[i];
for (j = 0; j < gena->count; ++j) {
struct aperture *g = &gena->ranges[j];
printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
(unsigned long long)g->base,
(unsigned long long)g->size,
(unsigned long long)h->base,
(unsigned long long)h->size);
if (apertures_overlap(g, h))
return true;
}
}
return false;
}
static int do_unregister_framebuffer(struct fb_info *fb_info);
#define VGA_FB_PHYS 0xA0000
static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
const char *name, bool primary)
{
int i;
/* check all firmware fbs and kick off if the base addr overlaps */
for (i = 0 ; i < FB_MAX; i++) {
struct apertures_struct *gen_aper;
if (!registered_fb[i])
continue;
if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
continue;
gen_aper = registered_fb[i]->apertures;
if (fb_do_apertures_overlap(gen_aper, a) ||
(primary && gen_aper && gen_aper->count &&
gen_aper->ranges[0].base == VGA_FB_PHYS)) {
printk(KERN_INFO "fb: conflicting fb hw usage "
"%s vs %s - removing generic driver\n",
name, registered_fb[i]->fix.id);
do_unregister_framebuffer(registered_fb[i]);
}
}
}
static int do_register_framebuffer(struct fb_info *fb_info)
{
int i;
struct fb_event event;
struct fb_videomode mode;
if (fb_check_foreignness(fb_info))
return -ENOSYS;
do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
fb_is_primary_device(fb_info));
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 = i;
atomic_set(&fb_info->count, 1);
mutex_init(&fb_info->lock);
mutex_init(&fb_info->mm_lock);
fb_info->dev = device_create(fb_class, fb_info->device,
MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
if (IS_ERR(fb_info->dev)) {
/* Not fatal */
printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
fb_info->dev = NULL;
} else
fb_init_device(fb_info);
if (fb_info->pixmap.addr == NULL) {
fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
if (fb_info->pixmap.addr) {
fb_info->pixmap.size = FBPIXMAPSIZE;
fb_info->pixmap.buf_align = 1;
fb_info->pixmap.scan_align = 1;
fb_info->pixmap.access_align = 32;
fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
}
}
fb_info->pixmap.offset = 0;
if (!fb_info->pixmap.blit_x)
fb_info->pixmap.blit_x = ~(u32)0;
if (!fb_info->pixmap.blit_y)
fb_info->pixmap.blit_y = ~(u32)0;
if (!fb_info->modelist.prev || !fb_info->modelist.next)
INIT_LIST_HEAD(&fb_info->modelist);
fb_var_to_videomode(&mode, &fb_info->var);
fb_add_videomode(&mode, &fb_info->modelist);
registered_fb[i] = fb_info;
event.info = fb_info;
if (!lock_fb_info(fb_info))
return -ENODEV;
fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
unlock_fb_info(fb_info);
return 0;
}
static int do_unregister_framebuffer(struct fb_info *fb_info)
{
struct fb_event event;
int i, ret = 0;
i = fb_info->node;
if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
return -EINVAL;
if (!lock_fb_info(fb_info))
return -ENODEV;
event.info = fb_info;
ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
unlock_fb_info(fb_info);
if (ret)
return -EINVAL;
if (fb_info->pixmap.addr &&
(fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
kfree(fb_info->pixmap.addr);
fb_destroy_modelist(&fb_info->modelist);
registered_fb[i] = NULL;
num_registered_fb--;
fb_cleanup_device(fb_info);
device_destroy(fb_class, MKDEV(FB_MAJOR, i));
event.info = fb_info;
fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
/* this may free fb info */
put_fb_info(fb_info);
return 0;
}
void remove_conflicting_framebuffers(struct apertures_struct *a,
const char *name, bool primary)
{
mutex_lock(&registration_lock);
do_remove_conflicting_framebuffers(a, name, primary);
mutex_unlock(&registration_lock);
}
EXPORT_SYMBOL(remove_conflicting_framebuffers);
/**
* 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 ret;
mutex_lock(&registration_lock);
ret = do_register_framebuffer(fb_info);
mutex_unlock(&registration_lock);
return ret;
}
/**
* 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.
*
* This function will also notify the framebuffer console
* to release the driver.
*
* This is meant to be called within a driver's module_exit()
* function. If this is called outside module_exit(), ensure
* that the driver implements fb_open() and fb_release() to
* check that no processes are using the device.
*/
int
unregister_framebuffer(struct fb_info *fb_info)
{
int ret;
mutex_lock(&registration_lock);
ret = do_unregister_framebuffer(fb_info);
mutex_unlock(&registration_lock);
return ret;
}
/**
* fb_set_suspend - low level driver signals suspend
* @info: framebuffer affected
* @state: 0 = resuming, !=0 = suspending
*
* This is meant to be used by low level drivers to
* signal suspend/resume to the core & clients.
* It must be called with the console semaphore held
*/
void fb_set_suspend(struct fb_info *info, int state)
{
struct fb_event event;
event.info = info;
if (state) {
fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
info->state = FBINFO_STATE_SUSPENDED;
} else {
info->state = FBINFO_STATE_RUNNING;
fb_notifier_call_chain(FB_EVENT_RESUME, &event);
}
}
/**
* fbmem_init - init frame buffer subsystem
*
* Initialize the frame buffer subsystem.
*
* NOTE: This function is _only_ to be called by drivers/char/mem.c.
*
*/
static int __init
fbmem_init(void)
{
proc_create("fb", 0, NULL, &fb_proc_fops);
if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
printk("unable to get major %d for fb devs\n", FB_MAJOR);
fb_class = class_create(THIS_MODULE, "graphics");
if (IS_ERR(fb_class)) {
printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
fb_class = NULL;
}
return 0;
}
#ifdef MODULE
module_init(fbmem_init);
static void __exit
fbmem_exit(void)
{
remove_proc_entry("fb", NULL);
class_destroy(fb_class);
unregister_chrdev(FB_MAJOR, "fb");
}
module_exit(fbmem_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Framebuffer base");
#else
subsys_initcall(fbmem_init);
#endif
int fb_new_modelist(struct fb_info *info)
{
struct fb_event event;
struct fb_var_screeninfo var = info->var;
struct list_head *pos, *n;
struct fb_modelist *modelist;
struct fb_videomode *m, mode;
int err = 1;
list_for_each_safe(pos, n, &info->modelist) {
modelist = list_entry(pos, struct fb_modelist, list);
m = &modelist->mode;
fb_videomode_to_var(&var, m);
var.activate = FB_ACTIVATE_TEST;
err = fb_set_var(info, &var);
fb_var_to_videomode(&mode, &var);
if (err || !fb_mode_is_equal(m, &mode)) {
list_del(pos);
kfree(pos);
}
}
err = 1;
if (!list_empty(&info->modelist)) {
if (!lock_fb_info(info))
return -ENODEV;
event.info = info;
err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
unlock_fb_info(info);
}
return err;
}
static char *video_options[FB_MAX] __read_mostly;
static int ofonly __read_mostly;
/**
* fb_get_options - get kernel boot parameters
* @name: framebuffer name as it would appear in
* the boot parameter line
* (video=<name>:<options>)
* @option: the option will be stored here
*
* NOTE: Needed to maintain backwards compatibility
*/
int fb_get_options(char *name, char **option)
{
char *opt, *options = NULL;
int retval = 0;
int name_len = strlen(name), i;
if (name_len && ofonly && strncmp(name, "offb", 4))
retval = 1;
if (name_len && !retval) {
for (i = 0; i < FB_MAX; i++) {
if (video_options[i] == NULL)
continue;
if (!video_options[i][0])
continue;
opt = video_options[i];
if (!strncmp(name, opt, name_len) &&
opt[name_len] == ':')
options = opt + name_len + 1;
}
}
if (options && !strncmp(options, "off", 3))
retval = 1;
if (option)
*option = options;
return retval;
}
#ifndef MODULE
/**
* 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.
* It only stores the options. Drivers have to call
* fb_get_options() as necessary.
*
* Returns zero.
*
*/
static int __init video_setup(char *options)
{
int i, global = 0;
if (!options || !*options)
global = 1;
if (!global && !strncmp(options, "ofonly", 6)) {
ofonly = 1;
global = 1;
}
if (!global && !strchr(options, ':')) {
fb_mode_option = options;
global = 1;
}
if (!global) {
for (i = 0; i < FB_MAX; i++) {
if (video_options[i] == NULL) {
video_options[i] = options;
break;
}
}
}
return 1;
}
__setup("video=", video_setup);
#endif
/*
* Visible symbols for modules
*/
EXPORT_SYMBOL(register_framebuffer);
EXPORT_SYMBOL(unregister_framebuffer);
EXPORT_SYMBOL(num_registered_fb);
EXPORT_SYMBOL(registered_fb);
EXPORT_SYMBOL(fb_show_logo);
EXPORT_SYMBOL(fb_set_var);
EXPORT_SYMBOL(fb_blank);
EXPORT_SYMBOL(fb_pan_display);
EXPORT_SYMBOL(fb_get_buffer_offset);
EXPORT_SYMBOL(fb_set_suspend);
EXPORT_SYMBOL(fb_get_options);
MODULE_LICENSE("GPL");
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