forked from luck/tmp_suning_uos_patched
76ef0db72f
Replace IS_ERR/PTR_ERR Signed-off-by: Fabian Frederick <fabf@skynet.be> Link: http://lkml.kernel.org/r/1413576066-26925-1-git-send-email-fabf@skynet.be Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/*
|
|
* Generic System Framebuffers on x86
|
|
* Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*/
|
|
|
|
/*
|
|
* simple-framebuffer probing
|
|
* Try to convert "screen_info" into a "simple-framebuffer" compatible mode.
|
|
* If the mode is incompatible, we return "false" and let the caller create
|
|
* legacy nodes instead.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/platform_data/simplefb.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/screen_info.h>
|
|
#include <asm/sysfb.h>
|
|
|
|
static const char simplefb_resname[] = "BOOTFB";
|
|
static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
|
|
|
|
/* try parsing x86 screen_info into a simple-framebuffer mode struct */
|
|
__init bool parse_mode(const struct screen_info *si,
|
|
struct simplefb_platform_data *mode)
|
|
{
|
|
const struct simplefb_format *f;
|
|
__u8 type;
|
|
unsigned int i;
|
|
|
|
type = si->orig_video_isVGA;
|
|
if (type != VIDEO_TYPE_VLFB && type != VIDEO_TYPE_EFI)
|
|
return false;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(formats); ++i) {
|
|
f = &formats[i];
|
|
if (si->lfb_depth == f->bits_per_pixel &&
|
|
si->red_size == f->red.length &&
|
|
si->red_pos == f->red.offset &&
|
|
si->green_size == f->green.length &&
|
|
si->green_pos == f->green.offset &&
|
|
si->blue_size == f->blue.length &&
|
|
si->blue_pos == f->blue.offset &&
|
|
si->rsvd_size == f->transp.length &&
|
|
si->rsvd_pos == f->transp.offset) {
|
|
mode->format = f->name;
|
|
mode->width = si->lfb_width;
|
|
mode->height = si->lfb_height;
|
|
mode->stride = si->lfb_linelength;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
__init int create_simplefb(const struct screen_info *si,
|
|
const struct simplefb_platform_data *mode)
|
|
{
|
|
struct platform_device *pd;
|
|
struct resource res;
|
|
unsigned long len;
|
|
|
|
/* don't use lfb_size as it may contain the whole VMEM instead of only
|
|
* the part that is occupied by the framebuffer */
|
|
len = mode->height * mode->stride;
|
|
len = PAGE_ALIGN(len);
|
|
if (len > (u64)si->lfb_size << 16) {
|
|
printk(KERN_WARNING "sysfb: VRAM smaller than advertised\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* setup IORESOURCE_MEM as framebuffer memory */
|
|
memset(&res, 0, sizeof(res));
|
|
res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
|
res.name = simplefb_resname;
|
|
res.start = si->lfb_base;
|
|
res.end = si->lfb_base + len - 1;
|
|
if (res.end <= res.start)
|
|
return -EINVAL;
|
|
|
|
pd = platform_device_register_resndata(NULL, "simple-framebuffer", 0,
|
|
&res, 1, mode, sizeof(*mode));
|
|
return PTR_ERR_OR_ZERO(pd);
|
|
}
|