2
* Frame Buffer Driver for PKUnity-v3 Unigfx
3
* Code specific to PKUnity SoC and UniCore ISA
5
* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
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* Copyright (C) 2001-2010 Guan Xuetao
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
13
#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <asm/sizes.h>
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#include <mach/hardware.h>
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/* Platform_data reserved for unifb registers. */
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#define UNIFB_REGS_NUM 10
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/* RAM reserved for the frame buffer. */
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#define UNIFB_MEMSIZE (SZ_4M) /* 4 MB for 1024*768*32b */
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* cause UNIGFX don not have EDID
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* all the modes are organized as follow
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static const struct fb_videomode unifb_modes[] = {
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/* 0 640x480-60 VESA */
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{ "640x480@60", 60, 640, 480, 25175000, 48, 16, 34, 10, 96, 1,
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0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
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/* 1 640x480-75 VESA */
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{ "640x480@75", 75, 640, 480, 31500000, 120, 16, 18, 1, 64, 1,
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0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
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/* 2 800x600-60 VESA */
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{ "800x600@60", 60, 800, 600, 40000000, 88, 40, 26, 1, 128, 1,
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0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
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/* 3 800x600-75 VESA */
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{ "800x600@75", 75, 800, 600, 49500000, 160, 16, 23, 1, 80, 1,
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0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
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/* 4 1024x768-60 VESA */
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{ "1024x768@60", 60, 1024, 768, 65000000, 160, 24, 34, 3, 136, 1,
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0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
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/* 5 1024x768-75 VESA */
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{ "1024x768@75", 75, 1024, 768, 78750000, 176, 16, 30, 1, 96, 1,
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0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
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/* 6 1280x960-60 VESA */
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{ "1280x960@60", 60, 1280, 960, 108000000, 312, 96, 38, 1, 112, 1,
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0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
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/* 7 1440x900-60 VESA */
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{ "1440x900@60", 60, 1440, 900, 106500000, 232, 80, 30, 3, 152, 1,
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0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
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/* 8 FIXME 9 1024x600-60 VESA UNTESTED */
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{ "1024x600@60", 60, 1024, 600, 50650000, 160, 24, 26, 1, 136, 1,
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0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
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/* 9 FIXME 10 1024x600-75 VESA UNTESTED */
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{ "1024x600@75", 75, 1024, 600, 61500000, 176, 16, 23, 1, 96, 1,
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0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
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/* 10 FIXME 11 1366x768-60 VESA UNTESTED */
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{ "1366x768@60", 60, 1366, 768, 85500000, 256, 58, 18, 1, 112, 3,
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0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
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static struct fb_var_screeninfo unifb_default = {
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.activate = FB_ACTIVATE_NOW,
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.vmode = FB_VMODE_NONINTERLACED,
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static struct fb_fix_screeninfo unifb_fix = {
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_TRUECOLOR,
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.accel = FB_ACCEL_NONE,
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static void unifb_sync(struct fb_info *info)
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/* TODO: may, this can be replaced by interrupt */
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for (cnt = 0; cnt < 0x10000000; cnt++) {
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if (readl(UGE_COMMAND) & 0x1000000)
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dev_warn(info->device, "Warning: UniGFX GE time out ...\n");
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static void unifb_prim_fillrect(struct fb_info *info,
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const struct fb_fillrect *region)
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int awidth = region->width;
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int aheight = region->height;
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int m_iBpp = info->var.bits_per_pixel;
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int screen_width = info->var.xres;
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int src_sel = 1; /* from fg_color */
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int dst_x0 = region->dx;
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int dst_y0 = region->dy;
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int rop_alpha_sel = 0;
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int rop_alpha_code = 0xCC;
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int dst_pitch = screen_width * (m_iBpp / 8);
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int dst_offset = dst_y0 * dst_pitch + dst_x0 * (m_iBpp / 8);
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int src_pitch = screen_width * (m_iBpp / 8);
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int src_offset = src_y0 * src_pitch + src_x0 * (m_iBpp / 8);
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unsigned int command = 0;
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int bottom = info->var.yres - 1;
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int right = info->var.xres - 1;
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bottom = (bottom << 16) | right;
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command = (rop_alpha_sel << 26) | (pat_sel << 18) | (src_sel << 16)
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| (x_dir << 20) | (y_dir << 21) | (command << 24)
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| (clip_region << 23) | (clip_en << 22) | (tp_en << 27);
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src_pitch = (dst_pitch << 16) | src_pitch;
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awidth = awidth | (aheight << 16);
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alpha_r = ((rop_alpha_code & 0xff) << 8) | (alpha_r & 0xff)
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src_x0 = (src_x0 & 0x1fff) | ((src_y0 & 0x1fff) << 16);
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dst_x0 = (dst_x0 & 0x1fff) | ((dst_y0 & 0x1fff) << 16);
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fg_color = region->color;
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writel(((u32 *)(info->pseudo_palette))[fg_color], UGE_FCOLOR);
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writel(0, UGE_BCOLOR);
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writel(src_pitch, UGE_PITCH);
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writel(src_offset, UGE_SRCSTART);
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writel(dst_offset, UGE_DSTSTART);
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writel(awidth, UGE_WIDHEIGHT);
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writel(top, UGE_CLIP0);
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writel(bottom, UGE_CLIP1);
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writel(alpha_r, UGE_ROPALPHA);
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writel(src_x0, UGE_SRCXY);
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writel(dst_x0, UGE_DSTXY);
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writel(command, UGE_COMMAND);
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static void unifb_fillrect(struct fb_info *info,
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const struct fb_fillrect *region)
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struct fb_fillrect modded;
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if (info->flags & FBINFO_HWACCEL_DISABLED) {
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sys_fillrect(info, region);
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vxres = info->var.xres_virtual;
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vyres = info->var.yres_virtual;
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memcpy(&modded, region, sizeof(struct fb_fillrect));
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if (!modded.width || !modded.height ||
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modded.dx >= vxres || modded.dy >= vyres)
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if (modded.dx + modded.width > vxres)
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modded.width = vxres - modded.dx;
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if (modded.dy + modded.height > vyres)
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modded.height = vyres - modded.dy;
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unifb_prim_fillrect(info, &modded);
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static void unifb_prim_copyarea(struct fb_info *info,
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const struct fb_copyarea *area)
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int awidth = area->width;
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int aheight = area->height;
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int m_iBpp = info->var.bits_per_pixel;
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int screen_width = info->var.xres;
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int src_sel = 2; /* from mem */
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int src_x0 = area->sx;
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int dst_x0 = area->dx;
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int src_y0 = area->sy;
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int dst_y0 = area->dy;
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int rop_alpha_sel = 0;
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int rop_alpha_code = 0xCC;
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int dst_pitch = screen_width * (m_iBpp / 8);
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int dst_offset = dst_y0 * dst_pitch + dst_x0 * (m_iBpp / 8);
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int src_pitch = screen_width * (m_iBpp / 8);
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int src_offset = src_y0 * src_pitch + src_x0 * (m_iBpp / 8);
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unsigned int command = 0;
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int bottom = info->var.yres;
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int right = info->var.xres;
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if (src_y0 - dst_y0 > 0) {
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src_offset = (src_y0 + aheight) * src_pitch +
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src_x0 * (m_iBpp / 8);
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dst_offset = (dst_y0 + aheight) * dst_pitch +
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dst_x0 * (m_iBpp / 8);
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command = (rop_alpha_sel << 26) | (pat_sel << 18) | (src_sel << 16) |
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(x_dir << 20) | (y_dir << 21) | (command << 24) |
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(clip_region << 23) | (clip_en << 22) | (tp_en << 27);
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src_pitch = (dst_pitch << 16) | src_pitch;
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awidth = awidth | (aheight << 16);
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alpha_r = ((rop_alpha_code & 0xff) << 8) | (alpha_r & 0xff) |
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src_x0 = (src_x0 & 0x1fff) | ((src_y0 & 0x1fff) << 16);
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dst_x0 = (dst_x0 & 0x1fff) | ((dst_y0 & 0x1fff) << 16);
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bottom = (bottom << 16) | right;
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writel(src_pitch, UGE_PITCH);
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writel(src_offset, UGE_SRCSTART);
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writel(dst_offset, UGE_DSTSTART);
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writel(awidth, UGE_WIDHEIGHT);
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writel(top, UGE_CLIP0);
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writel(bottom, UGE_CLIP1);
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writel(bg_color, UGE_BCOLOR);
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writel(fg_color, UGE_FCOLOR);
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writel(alpha_r, UGE_ROPALPHA);
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writel(src_x0, UGE_SRCXY);
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writel(dst_x0, UGE_DSTXY);
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writel(command, UGE_COMMAND);
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static void unifb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
285
struct fb_copyarea modded;
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modded.sx = area->sx;
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modded.sy = area->sy;
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modded.dx = area->dx;
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modded.dy = area->dy;
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modded.width = area->width;
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modded.height = area->height;
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if (info->flags & FBINFO_HWACCEL_DISABLED) {
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sys_copyarea(info, area);
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vxres = info->var.xres_virtual;
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vyres = info->var.yres_virtual;
302
if (!modded.width || !modded.height ||
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modded.sx >= vxres || modded.sy >= vyres ||
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modded.dx >= vxres || modded.dy >= vyres)
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if (modded.sx + modded.width > vxres)
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modded.width = vxres - modded.sx;
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if (modded.dx + modded.width > vxres)
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modded.width = vxres - modded.dx;
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if (modded.sy + modded.height > vyres)
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modded.height = vyres - modded.sy;
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if (modded.dy + modded.height > vyres)
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modded.height = vyres - modded.dy;
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unifb_prim_copyarea(info, &modded);
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static void unifb_imageblit(struct fb_info *info, const struct fb_image *image)
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sys_imageblit(info, image);
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static u_long get_line_length(int xres_virtual, int bpp)
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length = xres_virtual * bpp;
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length = (length + 31) & ~31;
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* Setting the video mode has been split into two parts.
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* First part, xxxfb_check_var, must not write anything
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* to hardware, it should only verify and adjust var.
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* This means it doesn't alter par but it does use hardware
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* data from it to check this var.
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static int unifb_check_var(struct fb_var_screeninfo *var,
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struct fb_info *info)
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* FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
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* as FB_VMODE_SMOOTH_XPAN is only used internally
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if (var->vmode & FB_VMODE_CONUPDATE) {
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var->vmode |= FB_VMODE_YWRAP;
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var->xoffset = info->var.xoffset;
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var->yoffset = info->var.yoffset;
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* Some very basic checks
364
if (var->xres > var->xres_virtual)
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var->xres_virtual = var->xres;
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if (var->yres > var->yres_virtual)
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var->yres_virtual = var->yres;
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if (var->bits_per_pixel <= 1)
369
var->bits_per_pixel = 1;
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else if (var->bits_per_pixel <= 8)
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var->bits_per_pixel = 8;
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else if (var->bits_per_pixel <= 16)
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var->bits_per_pixel = 16;
374
else if (var->bits_per_pixel <= 24)
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var->bits_per_pixel = 24;
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else if (var->bits_per_pixel <= 32)
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var->bits_per_pixel = 32;
381
if (var->xres_virtual < var->xoffset + var->xres)
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var->xres_virtual = var->xoffset + var->xres;
383
if (var->yres_virtual < var->yoffset + var->yres)
384
var->yres_virtual = var->yoffset + var->yres;
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get_line_length(var->xres_virtual, var->bits_per_pixel);
391
if (line_length * var->yres_virtual > UNIFB_MEMSIZE)
395
* Now that we checked it we alter var. The reason being is that the
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* video mode passed in might not work but slight changes to it might
397
* make it work. This way we let the user know what is acceptable.
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switch (var->bits_per_pixel) {
404
var->green.offset = 0;
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var->green.length = 8;
406
var->blue.offset = 0;
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var->blue.length = 8;
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var->transp.offset = 0;
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var->transp.length = 0;
411
case 16: /* RGBA 5551 */
412
if (var->transp.length) {
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var->green.offset = 5;
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var->green.length = 5;
417
var->blue.offset = 10;
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var->blue.length = 5;
419
var->transp.offset = 15;
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var->transp.length = 1;
421
} else { /* RGB 565 */
422
var->red.offset = 11;
424
var->green.offset = 5;
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var->green.length = 6;
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var->blue.offset = 0;
427
var->blue.length = 5;
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var->transp.offset = 0;
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var->transp.length = 0;
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case 24: /* RGB 888 */
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var->green.offset = 8;
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var->green.length = 8;
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var->blue.offset = 16;
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var->blue.length = 8;
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var->transp.offset = 0;
440
var->transp.length = 0;
442
case 32: /* RGBA 8888 */
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var->red.offset = 16;
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var->green.offset = 8;
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var->green.length = 8;
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var->blue.offset = 0;
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var->blue.length = 8;
449
var->transp.offset = 24;
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var->transp.length = 8;
453
var->red.msb_right = 0;
454
var->green.msb_right = 0;
455
var->blue.msb_right = 0;
456
var->transp.msb_right = 0;
462
* This routine actually sets the video mode. It's in here where we
463
* the hardware state info->par and fix which can be affected by the
464
* change in par. For this driver it doesn't do much.
466
static int unifb_set_par(struct fb_info *info)
468
int hTotal, vTotal, hSyncStart, hSyncEnd, vSyncStart, vSyncEnd;
471
#ifdef CONFIG_PUV3_PM
476
for (i = 0; i <= 10; i++) {
477
if (info->var.xres == unifb_modes[i].xres
478
&& info->var.yres == unifb_modes[i].yres
479
&& info->var.upper_margin == unifb_modes[i].upper_margin
480
&& info->var.lower_margin == unifb_modes[i].lower_margin
481
&& info->var.left_margin == unifb_modes[i].left_margin
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&& info->var.right_margin == unifb_modes[i].right_margin
483
&& info->var.hsync_len == unifb_modes[i].hsync_len
484
&& info->var.vsync_len == unifb_modes[i].vsync_len) {
485
pixclk = unifb_modes[i].pixclock;
491
clk_vga = clk_get(info->device, "VGA_CLK");
492
if (clk_vga == ERR_PTR(-ENOENT))
496
if (clk_set_rate(clk_vga, pixclk)) { /* set clock failed */
497
info->fix = unifb_fix;
498
info->var = unifb_default;
499
if (clk_set_rate(clk_vga, unifb_default.pixclock))
505
info->fix.line_length = get_line_length(info->var.xres_virtual,
506
info->var.bits_per_pixel);
508
hSyncStart = info->var.xres + info->var.right_margin;
509
hSyncEnd = hSyncStart + info->var.hsync_len;
510
hTotal = hSyncEnd + info->var.left_margin;
512
vSyncStart = info->var.yres + info->var.lower_margin;
513
vSyncEnd = vSyncStart + info->var.vsync_len;
514
vTotal = vSyncEnd + info->var.upper_margin;
516
switch (info->var.bits_per_pixel) {
518
format = UDE_CFG_DST8;
521
format = UDE_CFG_DST16;
524
format = UDE_CFG_DST24;
527
format = UDE_CFG_DST32;
533
writel(info->fix.smem_start, UDE_FSA);
534
writel(info->var.yres, UDE_LS);
535
writel(get_line_length(info->var.xres,
536
info->var.bits_per_pixel) >> 3, UDE_PS);
537
/* >> 3 for hardware required. */
538
writel((hTotal << 16) | (info->var.xres), UDE_HAT);
539
writel(((hTotal - 1) << 16) | (info->var.xres - 1), UDE_HBT);
540
writel(((hSyncEnd - 1) << 16) | (hSyncStart - 1), UDE_HST);
541
writel((vTotal << 16) | (info->var.yres), UDE_VAT);
542
writel(((vTotal - 1) << 16) | (info->var.yres - 1), UDE_VBT);
543
writel(((vSyncEnd - 1) << 16) | (vSyncStart - 1), UDE_VST);
544
writel(UDE_CFG_GDEN_ENABLE | UDE_CFG_TIMEUP_ENABLE
545
| format | 0xC0000001, UDE_CFG);
551
* Set a single color register. The values supplied are already
552
* rounded down to the hardware's capabilities (according to the
553
* entries in the var structure). Return != 0 for invalid regno.
555
static int unifb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
556
u_int transp, struct fb_info *info)
558
if (regno >= 256) /* no. of hw registers */
561
/* grayscale works only partially under directcolor */
562
if (info->var.grayscale) {
563
/* grayscale = 0.30*R + 0.59*G + 0.11*B */
565
(red * 77 + green * 151 + blue * 28) >> 8;
568
#define CNVT_TOHW(val, width) ((((val)<<(width))+0x7FFF-(val))>>16)
569
switch (info->fix.visual) {
570
case FB_VISUAL_TRUECOLOR:
571
case FB_VISUAL_PSEUDOCOLOR:
572
red = CNVT_TOHW(red, info->var.red.length);
573
green = CNVT_TOHW(green, info->var.green.length);
574
blue = CNVT_TOHW(blue, info->var.blue.length);
575
transp = CNVT_TOHW(transp, info->var.transp.length);
577
case FB_VISUAL_DIRECTCOLOR:
578
red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */
579
green = CNVT_TOHW(green, 8);
580
blue = CNVT_TOHW(blue, 8);
581
/* hey, there is bug in transp handling... */
582
transp = CNVT_TOHW(transp, 8);
586
/* Truecolor has hardware independent palette */
587
if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
593
v = (red << info->var.red.offset) |
594
(green << info->var.green.offset) |
595
(blue << info->var.blue.offset) |
596
(transp << info->var.transp.offset);
597
switch (info->var.bits_per_pixel) {
603
((u32 *) (info->pseudo_palette))[regno] = v;
614
* Pan or Wrap the Display
616
* This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
618
static int unifb_pan_display(struct fb_var_screeninfo *var,
619
struct fb_info *info)
621
if (var->vmode & FB_VMODE_YWRAP) {
623
|| var->yoffset >= info->var.yres_virtual
627
if (var->xoffset + var->xres > info->var.xres_virtual ||
628
var->yoffset + var->yres > info->var.yres_virtual)
631
info->var.xoffset = var->xoffset;
632
info->var.yoffset = var->yoffset;
633
if (var->vmode & FB_VMODE_YWRAP)
634
info->var.vmode |= FB_VMODE_YWRAP;
636
info->var.vmode &= ~FB_VMODE_YWRAP;
640
int unifb_mmap(struct fb_info *info,
641
struct vm_area_struct *vma)
643
unsigned long size = vma->vm_end - vma->vm_start;
644
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
645
unsigned long pos = info->fix.smem_start + offset;
647
if (offset + size > info->fix.smem_len)
650
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
652
if (io_remap_pfn_range(vma, vma->vm_start, pos >> PAGE_SHIFT, size,
656
vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
661
static struct fb_ops unifb_ops = {
662
.fb_read = fb_sys_read,
663
.fb_write = fb_sys_write,
664
.fb_check_var = unifb_check_var,
665
.fb_set_par = unifb_set_par,
666
.fb_setcolreg = unifb_setcolreg,
667
.fb_pan_display = unifb_pan_display,
668
.fb_fillrect = unifb_fillrect,
669
.fb_copyarea = unifb_copyarea,
670
.fb_imageblit = unifb_imageblit,
671
.fb_mmap = unifb_mmap,
677
static int unifb_probe(struct platform_device *dev)
679
struct fb_info *info;
680
u32 unifb_regs[UNIFB_REGS_NUM];
681
int retval = -ENOMEM;
682
struct resource *iomem;
685
videomemory = (void *)__get_free_pages(GFP_KERNEL | __GFP_COMP,
686
get_order(UNIFB_MEMSIZE));
690
memset(videomemory, 0, UNIFB_MEMSIZE);
692
unifb_fix.smem_start = virt_to_phys(videomemory);
693
unifb_fix.smem_len = UNIFB_MEMSIZE;
695
iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
696
unifb_fix.mmio_start = iomem->start;
698
info = framebuffer_alloc(sizeof(u32)*256, &dev->dev);
702
info->screen_base = (char __iomem *)videomemory;
703
info->fbops = &unifb_ops;
705
retval = fb_find_mode(&info->var, info, NULL,
706
unifb_modes, 10, &unifb_modes[0], 16);
708
if (!retval || (retval == 4))
709
info->var = unifb_default;
711
info->fix = unifb_fix;
712
info->pseudo_palette = info->par;
714
info->flags = FBINFO_FLAG_DEFAULT;
715
#ifdef FB_ACCEL_PUV3_UNIGFX
716
info->fix.accel = FB_ACCEL_PUV3_UNIGFX;
719
retval = fb_alloc_cmap(&info->cmap, 256, 0);
723
retval = register_framebuffer(info);
726
platform_set_drvdata(dev, info);
727
platform_device_add_data(dev, unifb_regs, sizeof(u32) * UNIFB_REGS_NUM);
730
"fb%d: Virtual frame buffer device, using %dM of video memory\n",
731
info->node, UNIFB_MEMSIZE >> 20);
734
fb_dealloc_cmap(&info->cmap);
736
framebuffer_release(info);
741
static int unifb_remove(struct platform_device *dev)
743
struct fb_info *info = platform_get_drvdata(dev);
746
unregister_framebuffer(info);
747
fb_dealloc_cmap(&info->cmap);
748
framebuffer_release(info);
754
static int unifb_resume(struct platform_device *dev)
757
u32 *unifb_regs = dev->dev.platform_data;
759
if (dev->dev.power.power_state.event == PM_EVENT_ON)
764
if (dev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
765
writel(unifb_regs[0], UDE_FSA);
766
writel(unifb_regs[1], UDE_LS);
767
writel(unifb_regs[2], UDE_PS);
768
writel(unifb_regs[3], UDE_HAT);
769
writel(unifb_regs[4], UDE_HBT);
770
writel(unifb_regs[5], UDE_HST);
771
writel(unifb_regs[6], UDE_VAT);
772
writel(unifb_regs[7], UDE_VBT);
773
writel(unifb_regs[8], UDE_VST);
774
writel(unifb_regs[9], UDE_CFG);
776
dev->dev.power.power_state = PMSG_ON;
783
static int unifb_suspend(struct platform_device *dev, pm_message_t mesg)
785
u32 *unifb_regs = dev->dev.platform_data;
787
unifb_regs[0] = readl(UDE_FSA);
788
unifb_regs[1] = readl(UDE_LS);
789
unifb_regs[2] = readl(UDE_PS);
790
unifb_regs[3] = readl(UDE_HAT);
791
unifb_regs[4] = readl(UDE_HBT);
792
unifb_regs[5] = readl(UDE_HST);
793
unifb_regs[6] = readl(UDE_VAT);
794
unifb_regs[7] = readl(UDE_VBT);
795
unifb_regs[8] = readl(UDE_VST);
796
unifb_regs[9] = readl(UDE_CFG);
798
if (mesg.event == dev->dev.power.power_state.event)
801
switch (mesg.event) {
802
case PM_EVENT_FREEZE: /* about to take snapshot */
803
case PM_EVENT_PRETHAW: /* before restoring snapshot */
814
dev->dev.power.power_state = mesg;
819
#define unifb_resume NULL
820
#define unifb_suspend NULL
823
static struct platform_driver unifb_driver = {
824
.probe = unifb_probe,
825
.remove = unifb_remove,
826
.resume = unifb_resume,
827
.suspend = unifb_suspend,
829
.name = "PKUnity-v3-UNIGFX",
833
static int __init unifb_init(void)
836
if (fb_get_options("unifb", NULL))
840
return platform_driver_register(&unifb_driver);
843
module_init(unifb_init);
845
static void __exit unifb_exit(void)
847
platform_driver_unregister(&unifb_driver);
850
module_exit(unifb_exit);
852
MODULE_LICENSE("GPL v2");