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604 lines
14 KiB
C
604 lines
14 KiB
C
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/*
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* drivers/video/ubicom32vfb.c
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* Ubicom32 virtual frame buffer driver
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*
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* (C) Copyright 2009, Ubicom, Inc.
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*
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* This file is part of the Ubicom32 Linux Kernel Port.
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*
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* The Ubicom32 Linux Kernel Port is free software: you can redistribute
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* it and/or modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 2 of the
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* License, or (at your option) any later version.
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*
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* The Ubicom32 Linux Kernel Port is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Ubicom32 Linux Kernel Port. If not,
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* see <http://www.gnu.org/licenses/>.
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*/
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/*
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* This driver was based on skeletonfb.c, Skeleton for a frame buffer device by
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* Geert Uytterhoeven.
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/version.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/dma-mapping.h>
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#include <linux/platform_device.h>
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#include <linux/device.h>
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#include <linux/uaccess.h>
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#define DRIVER_NAME "ubicom32vfb"
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#define DRIVER_DESCRIPTION "Ubicom32 virtual frame buffer driver"
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#define PALETTE_ENTRIES_NO 16
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/*
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* Option variables
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*
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* vram_size: VRAM size in kilobytes, subject to alignment
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*/
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static int vram_size = 0;
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module_param(vram_size, int, 0);
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MODULE_PARM_DESC(vram_size, "VRAM size, in kilobytes to allocate, should be at least the size of one screen, subject to alignment");
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static int xres = 320;
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module_param(xres, int, 0);
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MODULE_PARM_DESC(xres, "x (horizontal) resolution");
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static int yres = 240;
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module_param(yres, int, 0);
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MODULE_PARM_DESC(yres, "y (vertical) resolution");
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static int bgr = 0;
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module_param(bgr, int, 0);
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MODULE_PARM_DESC(bgr, "display is BGR (Blue is MSB)");
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#define BITS_PER_PIXEL 16
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/*
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* Buffer alignment, must not be 0
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*/
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#define UBICOM32VFB_ALIGNMENT 4
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/*
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* fb_fix_screeninfo defines the non-changeable properties of the VDC, depending on what mode it is in.
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*/
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static struct fb_fix_screeninfo ubicom32vfb_fix = {
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.id = "Ubicom32",
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_TRUECOLOR,
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.accel = FB_ACCEL_UBICOM32_VFB,
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};
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/*
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* Filled in at probe time when we find out what the hardware supports
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*/
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static struct fb_var_screeninfo ubicom32vfb_var;
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/*
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* Private data structure
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*/
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struct ubicom32vfb_drvdata {
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struct fb_info *fbinfo;
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bool cmap_alloc;
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/*
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* The address of the framebuffer in memory
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*/
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void *fb;
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void *fb_aligned;
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/*
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* Total size of vram including alignment allowance
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*/
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u32 total_vram_size;
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/*
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* Fake palette of 16 colors
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*/
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u32 pseudo_palette[PALETTE_ENTRIES_NO];
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};
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static struct platform_device *ubicom32vfb_platform_device;
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/*
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* ubicom32vfb_pan_display
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* Pans the display to a given location. Supports only y direction panning.
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*/
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static int ubicom32vfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
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{
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struct ubicom32vfb_drvdata *ud = (struct ubicom32vfb_drvdata *)fbi->par;
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void *new_addr;
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/*
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* Get the last y line that would be displayed. Since we don't support YWRAP,
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* it must be less than our virtual y size.
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*/
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u32 lasty = var->yoffset + var->yres;
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if (lasty > fbi->var.yres_virtual) {
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/*
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* We would fall off the end of our frame buffer if we panned here.
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*/
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return -EINVAL;
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}
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if (var->xoffset) {
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/*
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* We don't support panning in the x direction
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*/
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return -EINVAL;
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}
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/*
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* Everything looks sane, go ahead and pan
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*
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* We have to calculate a new address for the VDC to look at
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*/
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new_addr = ud->fb_aligned + (var->yoffset * fbi->fix.line_length);
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return 0;
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}
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/*
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* ubicom32vfb_setcolreg
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* Sets a color in our virtual palette
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*/
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static int ubicom32vfb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi)
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{
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u32 *palette = fbi->pseudo_palette;
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if (regno >= PALETTE_ENTRIES_NO) {
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return -EINVAL;
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}
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/*
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* We only use 8 bits from each color
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*/
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red >>= 8;
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green >>= 8;
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blue >>= 8;
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/*
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* Convert any grayscale values
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*/
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if (fbi->var.grayscale) {
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u16 gray = red + green + blue;
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gray += (gray >> 2) + (gray >> 3) - (gray >> 7);
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gray >>= 2;
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if (gray > 255) {
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gray = 255;
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}
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red = gray;
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blue = gray;
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green = gray;
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}
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palette[regno] = (red << fbi->var.red.offset) | (green << fbi->var.green.offset) |
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(blue << fbi->var.blue.offset);
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return 0;
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}
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/*
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* ubicom32vfb_mmap
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*/
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static int ubicom32vfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
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{
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struct ubicom32vfb_drvdata *ud = (struct ubicom32vfb_drvdata *)info->par;
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vma->vm_start = (unsigned long)(ud->fb_aligned);
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vma->vm_end = vma->vm_start + info->fix.smem_len;
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/* For those who don't understand how mmap works, go read
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* Documentation/nommu-mmap.txt.
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* For those that do, you will know that the VM_MAYSHARE flag
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* must be set in the vma->vm_flags structure on noMMU
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* Other flags can be set, and are documented in
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* include/linux/mm.h
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*/
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vma->vm_flags |= VM_MAYSHARE | VM_SHARED;
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return 0;
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}
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/*
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* ubicom32vfb_check_var
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* Check the var, tweak it but don't change operational parameters.
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*/
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static int ubicom32vfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
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{
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struct ubicom32vfb_drvdata *ud = (struct ubicom32vfb_drvdata *)info->par;
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u32 line_size = var->xres * (BITS_PER_PIXEL / 8);
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/*
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* See if we can handle this bpp
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*/
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if (var->bits_per_pixel > BITS_PER_PIXEL) {
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return -EINVAL;
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}
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var->bits_per_pixel = BITS_PER_PIXEL;
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/*
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* See if we have enough memory to handle this resolution
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*/
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if ((line_size * var->yres * BITS_PER_PIXEL / 8) > ud->total_vram_size) {
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return -EINVAL;
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}
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var->xres_virtual = var->xres;
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var->yres_virtual = ud->total_vram_size / line_size;
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var->red.length = 5;
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var->green.length = 6;
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var->green.offset = 5;
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var->blue.length = 5;
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var->transp.offset = var->transp.length = 0;
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if (bgr) {
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var->red.offset = 0;
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var->blue.offset = 11;
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} else {
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var->red.offset = 11;
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var->blue.offset = 0;
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}
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var->nonstd = 0;
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var->height = -1;
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var->width = -1;
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var->vmode = FB_VMODE_NONINTERLACED;
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var->sync = 0;
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return 0;
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}
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/*
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* ubicom32vfb_set_par
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* Set the video mode according to info->var
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*/
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static int ubicom32vfb_set_par(struct fb_info *info)
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{
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/*
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* Anything changed?
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*/
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if ((xres == info->var.xres) && (yres == info->var.yres)) {
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return 0;
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}
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/*
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* Implement changes
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*/
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xres = info->var.xres;
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yres = info->var.yres;
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info->fix.visual = FB_VISUAL_TRUECOLOR;
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info->fix.xpanstep = 0;
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info->fix.ypanstep = 1;
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info->fix.line_length = xres * (BITS_PER_PIXEL / 8);
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return 0;
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}
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/*
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* ubicom32vfb_ops
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* List of supported operations
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*/
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static struct fb_ops ubicom32vfb_ops =
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{
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.owner = THIS_MODULE,
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.fb_pan_display = ubicom32vfb_pan_display,
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.fb_setcolreg = ubicom32vfb_setcolreg,
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.fb_mmap = ubicom32vfb_mmap,
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.fb_check_var = ubicom32vfb_check_var,
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.fb_set_par = ubicom32vfb_set_par,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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};
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/*
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* ubicom32vfb_release
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*/
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static int ubicom32vfb_release(struct device *dev)
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{
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struct ubicom32vfb_drvdata *ud = dev_get_drvdata(dev);
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unregister_framebuffer(ud->fbinfo);
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if (ud->cmap_alloc) {
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fb_dealloc_cmap(&ud->fbinfo->cmap);
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}
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if (ud->fb) {
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kfree(ud->fb);
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}
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framebuffer_release(ud->fbinfo);
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dev_set_drvdata(dev, NULL);
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return 0;
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}
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/*
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* ubicom32vfb_platform_probe
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*/
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static int __init ubicom32vfb_platform_probe(struct platform_device *pdev)
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{
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struct ubicom32vfb_drvdata *ud;
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struct fb_info *fbinfo;
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int rc;
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size_t fbsize;
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struct device *dev = &pdev->dev;
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int offset;
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/*
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* This is the minimum VRAM size
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*/
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fbsize = xres * yres * 2;
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if (!vram_size) {
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vram_size = (fbsize + 1023) / 1024;
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} else {
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if (fbsize > (vram_size * 1024)) {
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dev_err(dev, "Not enough VRAM for display, need >= %u bytes\n", fbsize);
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return -ENOMEM; // should be ebadparam?
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}
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}
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/*
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* Allocate the framebuffer instance + our private data
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*/
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fbinfo = framebuffer_alloc(sizeof(struct ubicom32vfb_drvdata), &pdev->dev);
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if (!fbinfo) {
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dev_err(dev, "Not enough memory to allocate instance.\n");
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return -ENOMEM;
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}
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/*
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* Fill in our private data.
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*/
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ud = (struct ubicom32vfb_drvdata *)fbinfo->par;
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ud->fbinfo = fbinfo;
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dev_set_drvdata(dev, ud);
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/*
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* Allocate and align the requested amount of VRAM
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*/
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ud->total_vram_size = (vram_size * 1024) + UBICOM32VFB_ALIGNMENT;
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ud->fb = kmalloc(ud->total_vram_size, GFP_KERNEL);
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if (ud->fb == NULL) {
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dev_err(dev, "Couldn't allocate VRAM\n");
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rc = -ENOMEM;
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goto fail;
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}
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offset = (u32_t)ud->fb & (UBICOM32VFB_ALIGNMENT - 1);
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if (!offset) {
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ud->fb_aligned = ud->fb;
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} else {
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offset = UBICOM32VFB_ALIGNMENT - offset;
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ud->fb_aligned = ud->fb + offset;
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}
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/*
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* Clear the entire frame buffer
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*/
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memset(ud->fb_aligned, 0, vram_size * 1024);
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/*
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* Fill in the fb_var_screeninfo structure
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*/
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memset(&ubicom32vfb_var, 0, sizeof(ubicom32vfb_var));
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ubicom32vfb_var.bits_per_pixel = BITS_PER_PIXEL;
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ubicom32vfb_var.red.length = 5;
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ubicom32vfb_var.green.length = 6;
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ubicom32vfb_var.green.offset = 5;
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ubicom32vfb_var.blue.length = 5;
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ubicom32vfb_var.activate = FB_ACTIVATE_NOW;
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if (bgr) {
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ubicom32vfb_var.red.offset = 0;
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ubicom32vfb_var.blue.offset = 11;
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} else {
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ubicom32vfb_var.red.offset = 11;
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ubicom32vfb_var.blue.offset = 0;
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}
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/*
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* Fill in the fb_info structure
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*/
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ud->fbinfo->device = dev;
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ud->fbinfo->screen_base = (void *)ud->fb_aligned;
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ud->fbinfo->fbops = &ubicom32vfb_ops;
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ud->fbinfo->fix = ubicom32vfb_fix;
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ud->fbinfo->fix.smem_start = (u32)ud->fb_aligned;
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ud->fbinfo->fix.smem_len = vram_size * 1024;
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ud->fbinfo->fix.line_length = xres * 2;
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ud->fbinfo->fix.mmio_start = (u32)ud;
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ud->fbinfo->fix.mmio_len = sizeof(struct ubicom32vfb_drvdata);
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/*
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* We support panning in the y direction only
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*/
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ud->fbinfo->fix.xpanstep = 0;
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ud->fbinfo->fix.ypanstep = 1;
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ud->fbinfo->pseudo_palette = ud->pseudo_palette;
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ud->fbinfo->flags = FBINFO_DEFAULT;
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||
|
ud->fbinfo->var = ubicom32vfb_var;
|
||
|
ud->fbinfo->var.xres = xres;
|
||
|
ud->fbinfo->var.yres = yres;
|
||
|
|
||
|
/*
|
||
|
* We cannot pan in the X direction, so xres_virtual is xres
|
||
|
* We can pan in the Y direction, so yres_virtual is vram_size / ud->fbinfo->fix.line_length
|
||
|
*/
|
||
|
ud->fbinfo->var.xres_virtual = xres;
|
||
|
ud->fbinfo->var.yres_virtual = (vram_size * 1024) / ud->fbinfo->fix.line_length;
|
||
|
|
||
|
/*
|
||
|
* Allocate a color map
|
||
|
*/
|
||
|
rc = fb_alloc_cmap(&ud->fbinfo->cmap, PALETTE_ENTRIES_NO, 0);
|
||
|
if (rc) {
|
||
|
dev_err(dev, "Fail to allocate colormap (%d entries)\n",
|
||
|
PALETTE_ENTRIES_NO);
|
||
|
goto fail;
|
||
|
}
|
||
|
ud->cmap_alloc = true;
|
||
|
|
||
|
/*
|
||
|
* Register new frame buffer
|
||
|
*/
|
||
|
rc = register_framebuffer(ud->fbinfo);
|
||
|
if (rc) {
|
||
|
dev_err(dev, "Could not register frame buffer\n");
|
||
|
goto fail;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Tell the log we are here
|
||
|
*/
|
||
|
dev_info(dev, "fbaddr=%p align=%p, size=%uKB screen(%ux%u) virt(%ux%u)\n",
|
||
|
ud->fb, ud->fb_aligned, vram_size, ud->fbinfo->var.xres, ud->fbinfo->var.yres,
|
||
|
ud->fbinfo->var.xres_virtual, ud->fbinfo->var.yres_virtual);
|
||
|
|
||
|
/*
|
||
|
* Success
|
||
|
*/
|
||
|
return 0;
|
||
|
|
||
|
fail:
|
||
|
ubicom32vfb_release(dev);
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* ubicom32vfb_platform_remove
|
||
|
*/
|
||
|
static int ubicom32vfb_platform_remove(struct platform_device *pdev)
|
||
|
{
|
||
|
dev_info(&(pdev->dev), "Ubicom32 FB Driver Remove\n");
|
||
|
return ubicom32vfb_release(&pdev->dev);
|
||
|
}
|
||
|
|
||
|
static struct platform_driver ubicom32vfb_platform_driver = {
|
||
|
.probe = ubicom32vfb_platform_probe,
|
||
|
.remove = ubicom32vfb_platform_remove,
|
||
|
.driver = {
|
||
|
.name = DRIVER_NAME,
|
||
|
.owner = THIS_MODULE,
|
||
|
},
|
||
|
};
|
||
|
|
||
|
#ifndef MODULE
|
||
|
/*
|
||
|
* ubicom32vfb_setup
|
||
|
* Process kernel boot options
|
||
|
*/
|
||
|
static int __init ubicom32vfb_setup(char *options)
|
||
|
{
|
||
|
char *this_opt;
|
||
|
|
||
|
if (!options || !*options) {
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
while ((this_opt = strsep(&options, ",")) != NULL) {
|
||
|
if (!*this_opt) {
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
if (!strncmp(this_opt, "vram_size=", 10)) {
|
||
|
vram_size = simple_strtoul(this_opt + 10, NULL, 0);
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
if (!strncmp(this_opt, "bgr=", 4)) {
|
||
|
bgr = simple_strtoul(this_opt + 4, NULL, 0);
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
if (!strncmp(this_opt, "xres=", 5)) {
|
||
|
xres = simple_strtoul(this_opt + 5, NULL, 0);
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
if (!strncmp(this_opt, "yres=", 5)) {
|
||
|
yres = simple_strtoul(this_opt + 5, NULL, 0);
|
||
|
continue;
|
||
|
}
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
#endif /* MODULE */
|
||
|
|
||
|
/*
|
||
|
* ubicom32vfb_init
|
||
|
*/
|
||
|
static int __devinit ubicom32vfb_init(void)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
#ifndef MODULE
|
||
|
/*
|
||
|
* Get kernel boot options (in 'video=ubicom32vfb:<options>')
|
||
|
*/
|
||
|
char *option = NULL;
|
||
|
|
||
|
if (fb_get_options(DRIVER_NAME, &option)) {
|
||
|
return -ENODEV;
|
||
|
}
|
||
|
ubicom32vfb_setup(option);
|
||
|
#endif /* MODULE */
|
||
|
|
||
|
ret = platform_driver_register(&ubicom32vfb_platform_driver);
|
||
|
|
||
|
#ifdef CONFIG_FB_UBICOM32_VIRTUAL_NOAUTO
|
||
|
return ret;
|
||
|
#else
|
||
|
if (!ret) {
|
||
|
ubicom32vfb_platform_device = platform_device_alloc(DRIVER_NAME, 0);
|
||
|
|
||
|
if (ubicom32vfb_platform_device)
|
||
|
ret = platform_device_add(ubicom32vfb_platform_device);
|
||
|
else
|
||
|
ret = -ENOMEM;
|
||
|
|
||
|
if (ret) {
|
||
|
platform_device_put(ubicom32vfb_platform_device);
|
||
|
platform_driver_unregister(&ubicom32vfb_platform_driver);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return ret;
|
||
|
#endif
|
||
|
}
|
||
|
module_init(ubicom32vfb_init);
|
||
|
|
||
|
/*
|
||
|
* ubicom32vfb_exit
|
||
|
*/
|
||
|
static void __exit ubicom32vfb_exit(void)
|
||
|
{
|
||
|
platform_device_unregister(ubicom32vfb_platform_device);
|
||
|
platform_driver_unregister(&ubicom32vfb_platform_driver);
|
||
|
}
|
||
|
module_exit(ubicom32vfb_exit);
|
||
|
|
||
|
MODULE_LICENSE("GPL");
|
||
|
MODULE_AUTHOR("Patrick Tjin <@ubicom.com>");
|
||
|
MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
|