Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 528 insertions, 0 deletions

diff --git a/drivers/video/vfb.c b/drivers/video/vfb.c
new file mode 100644
index 000000000000..b137a3fe0752
--- /dev/null
+++ b/drivers/video/vfb.c
@@ -0,0 +1,528 @@
+/*
+ *  linux/drivers/video/vfb.c -- Virtual frame buffer device
+ *
+ *      Copyright (C) 2002 James Simmons
+ *
+ *      Copyright (C) 1997 Geert Uytterhoeven
+ *
+ *  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/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <asm/uaccess.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+
+    /*
+     *  RAM we reserve for the frame buffer. This defines the maximum screen
+     *  size
+     *
+     *  The default can be overridden if the driver is compiled as a module
+     */
+
+#define VIDEOMEMSIZE    (1*1024*1024)   /* 1 MB */
+
+static void *videomemory;
+static u_long videomemorysize = VIDEOMEMSIZE;
+module_param(videomemorysize, ulong, 0);
+
+static struct fb_var_screeninfo vfb_default __initdata = {
+        .xres =         640,
+        .yres =         480,
+        .xres_virtual = 640,
+        .yres_virtual = 480,
+        .bits_per_pixel = 8,
+        .red =          { 0, 8, 0 },
+        .green =        { 0, 8, 0 },
+        .blue =         { 0, 8, 0 },
+        .activate =     FB_ACTIVATE_TEST,
+        .height =       -1,
+        .width =        -1,
+        .pixclock =     20000,
+        .left_margin =  64,
+        .right_margin = 64,
+        .upper_margin = 32,
+        .lower_margin = 32,
+        .hsync_len =    64,
+        .vsync_len =    2,
+        .vmode =        FB_VMODE_NONINTERLACED,
+};
+
+static struct fb_fix_screeninfo vfb_fix __initdata = {
+        .id =           "Virtual FB",
+        .type =         FB_TYPE_PACKED_PIXELS,
+        .visual =       FB_VISUAL_PSEUDOCOLOR,
+        .xpanstep =     1,
+        .ypanstep =     1,
+        .ywrapstep =    1,
+        .accel =        FB_ACCEL_NONE,
+};
+
+static int vfb_enable __initdata = 0;   /* disabled by default */
+module_param(vfb_enable, bool, 0);
+
+static int vfb_check_var(struct fb_var_screeninfo *var,
+                         struct fb_info *info);
+static int vfb_set_par(struct fb_info *info);
+static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+                         u_int transp, struct fb_info *info);
+static int vfb_pan_display(struct fb_var_screeninfo *var,
+                           struct fb_info *info);
+static int vfb_mmap(struct fb_info *info, struct file *file,
+                    struct vm_area_struct *vma);
+
+static struct fb_ops vfb_ops = {
+        .fb_check_var   = vfb_check_var,
+        .fb_set_par     = vfb_set_par,
+        .fb_setcolreg   = vfb_setcolreg,
+        .fb_pan_display = vfb_pan_display,
+        .fb_fillrect    = cfb_fillrect,
+        .fb_copyarea    = cfb_copyarea,
+        .fb_imageblit   = cfb_imageblit,
+        .fb_cursor      = soft_cursor,
+        .fb_mmap        = vfb_mmap,
+};
+
+    /*
+     *  Internal routines
+     */
+
+static u_long get_line_length(int xres_virtual, int bpp)
+{
+        u_long length;
+
+        length = xres_virtual * bpp;
+        length = (length + 31) & ~31;
+        length >>= 3;
+        return (length);
+}
+
+    /*
+     *  Setting the video mode has been split into two parts.
+     *  First part, xxxfb_check_var, must not write anything
+     *  to hardware, it should only verify and adjust var.
+     *  This means it doesn't alter par but it does use hardware
+     *  data from it to check this var. 
+     */
+
+static int vfb_check_var(struct fb_var_screeninfo *var,
+                         struct fb_info *info)
+{
+        u_long line_length;
+
+        /*
+         *  FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
+         *  as FB_VMODE_SMOOTH_XPAN is only used internally
+         */
+
+        if (var->vmode & FB_VMODE_CONUPDATE) {
+                var->vmode |= FB_VMODE_YWRAP;
+                var->xoffset = info->var.xoffset;
+                var->yoffset = info->var.yoffset;
+        }
+
+        /*
+         *  Some very basic checks
+         */
+        if (!var->xres)
+                var->xres = 1;
+        if (!var->yres)
+                var->yres = 1;
+        if (var->xres > var->xres_virtual)
+                var->xres_virtual = var->xres;
+        if (var->yres > var->yres_virtual)
+                var->yres_virtual = var->yres;
+        if (var->bits_per_pixel <= 1)
+                var->bits_per_pixel = 1;
+        else if (var->bits_per_pixel <= 8)
+                var->bits_per_pixel = 8;
+        else if (var->bits_per_pixel <= 16)
+                var->bits_per_pixel = 16;
+        else if (var->bits_per_pixel <= 24)
+                var->bits_per_pixel = 24;
+        else if (var->bits_per_pixel <= 32)
+                var->bits_per_pixel = 32;
+        else
+                return -EINVAL;
+
+        if (var->xres_virtual < var->xoffset + var->xres)
+                var->xres_virtual = var->xoffset + var->xres;
+        if (var->yres_virtual < var->yoffset + var->yres)
+                var->yres_virtual = var->yoffset + var->yres;
+
+        /*
+         *  Memory limit
+         */
+        line_length =
+            get_line_length(var->xres_virtual, var->bits_per_pixel);
+        if (line_length * var->yres_virtual > videomemorysize)
+                return -ENOMEM;
+
+        /*
+         * Now that we checked it we alter var. The reason being is that the video
+         * mode passed in might not work but slight changes to it might make it 
+         * work. This way we let the user know what is acceptable.
+         */
+        switch (var->bits_per_pixel) {
+        case 1:
+        case 8:
+                var->red.offset = 0;
+                var->red.length = 8;
+                var->green.offset = 0;
+                var->green.length = 8;
+                var->blue.offset = 0;
+                var->blue.length = 8;
+                var->transp.offset = 0;
+                var->transp.length = 0;
+                break;
+        case 16:                /* RGBA 5551 */
+                if (var->transp.length) {
+                        var->red.offset = 0;
+                        var->red.length = 5;
+                        var->green.offset = 5;
+                        var->green.length = 5;
+                        var->blue.offset = 10;
+                        var->blue.length = 5;
+                        var->transp.offset = 15;
+                        var->transp.length = 1;
+                } else {        /* RGB 565 */
+                        var->red.offset = 0;
+                        var->red.length = 5;
+                        var->green.offset = 5;
+                        var->green.length = 6;
+                        var->blue.offset = 11;
+                        var->blue.length = 5;
+                        var->transp.offset = 0;
+                        var->transp.length = 0;
+                }
+                break;
+        case 24:                /* RGB 888 */
+                var->red.offset = 0;
+                var->red.length = 8;
+                var->green.offset = 8;
+                var->green.length = 8;
+                var->blue.offset = 16;
+                var->blue.length = 8;
+                var->transp.offset = 0;
+                var->transp.length = 0;
+                break;
+        case 32:                /* RGBA 8888 */
+                var->red.offset = 0;
+                var->red.length = 8;
+                var->green.offset = 8;
+                var->green.length = 8;
+                var->blue.offset = 16;
+                var->blue.length = 8;
+                var->transp.offset = 24;
+                var->transp.length = 8;
+                break;
+        }
+        var->red.msb_right = 0;
+        var->green.msb_right = 0;
+        var->blue.msb_right = 0;
+        var->transp.msb_right = 0;
+
+        return 0;
+}
+
+/* This routine actually sets the video mode. It's in here where we
+ * the hardware state info->par and fix which can be affected by the 
+ * change in par. For this driver it doesn't do much. 
+ */
+static int vfb_set_par(struct fb_info *info)
+{
+        info->fix.line_length = get_line_length(info->var.xres_virtual,
+                                                info->var.bits_per_pixel);
+        return 0;
+}
+
+    /*
+     *  Set a single color register. The values supplied are already
+     *  rounded down to the hardware's capabilities (according to the
+     *  entries in the var structure). Return != 0 for invalid regno.
+     */
+
+static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+                         u_int transp, struct fb_info *info)
+{
+        if (regno >= 256)       /* no. of hw registers */
+                return 1;
+        /*
+         * Program hardware... do anything you want with transp
+         */
+
+        /* grayscale works only partially under directcolor */
+        if (info->var.grayscale) {
+                /* grayscale = 0.30*R + 0.59*G + 0.11*B */
+                red = green = blue =
+                    (red * 77 + green * 151 + blue * 28) >> 8;
+        }
+
+        /* Directcolor:
+         *   var->{color}.offset contains start of bitfield
+         *   var->{color}.length contains length of bitfield
+         *   {hardwarespecific} contains width of RAMDAC
+         *   cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset)
+         *   RAMDAC[X] is programmed to (red, green, blue)
+         * 
+         * Pseudocolor:
+         *    uses offset = 0 && length = RAMDAC register width.
+         *    var->{color}.offset is 0
+         *    var->{color}.length contains widht of DAC
+         *    cmap is not used
+         *    RAMDAC[X] is programmed to (red, green, blue)
+         * Truecolor:
+         *    does not use DAC. Usually 3 are present.
+         *    var->{color}.offset contains start of bitfield
+         *    var->{color}.length contains length of bitfield
+         *    cmap is programmed to (red << red.offset) | (green << green.offset) |
+         *                      (blue << blue.offset) | (transp << transp.offset)
+         *    RAMDAC does not exist
+         */
+#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
+        switch (info->fix.visual) {
+        case FB_VISUAL_TRUECOLOR:
+        case FB_VISUAL_PSEUDOCOLOR:
+                red = CNVT_TOHW(red, info->var.red.length);
+                green = CNVT_TOHW(green, info->var.green.length);
+                blue = CNVT_TOHW(blue, info->var.blue.length);
+                transp = CNVT_TOHW(transp, info->var.transp.length);
+                break;
+        case FB_VISUAL_DIRECTCOLOR:
+                red = CNVT_TOHW(red, 8);        /* expect 8 bit DAC */
+                green = CNVT_TOHW(green, 8);
+                blue = CNVT_TOHW(blue, 8);
+                /* hey, there is bug in transp handling... */
+                transp = CNVT_TOHW(transp, 8);
+                break;
+        }
+#undef CNVT_TOHW
+        /* Truecolor has hardware independent palette */
+        if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
+                u32 v;
+
+                if (regno >= 16)
+                        return 1;
+
+                v = (red << info->var.red.offset) |
+                    (green << info->var.green.offset) |
+                    (blue << info->var.blue.offset) |
+                    (transp << info->var.transp.offset);
+                switch (info->var.bits_per_pixel) {
+                case 8:
+                        break;
+                case 16:
+                        ((u32 *) (info->pseudo_palette))[regno] = v;
+                        break;
+                case 24:
+                case 32:
+                        ((u32 *) (info->pseudo_palette))[regno] = v;
+                        break;
+                }
+                return 0;
+        }
+        return 0;
+}
+
+    /*
+     *  Pan or Wrap the Display
+     *
+     *  This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
+     */
+
+static int vfb_pan_display(struct fb_var_screeninfo *var,
+                           struct fb_info *info)
+{
+        if (var->vmode & FB_VMODE_YWRAP) {
+                if (var->yoffset < 0
+                    || var->yoffset >= info->var.yres_virtual
+                    || var->xoffset)
+                        return -EINVAL;
+        } else {
+                if (var->xoffset + var->xres > info->var.xres_virtual ||
+                    var->yoffset + var->yres > info->var.yres_virtual)
+                        return -EINVAL;
+        }
+        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;
+}
+
+    /*
+     *  Most drivers don't need their own mmap function 
+     */
+
+static int vfb_mmap(struct fb_info *info, struct file *file,
+                    struct vm_area_struct *vma)
+{
+        return -EINVAL;
+}
+
+#ifndef MODULE
+static int __init vfb_setup(char *options)
+{
+        char *this_opt;
+
+        vfb_enable = 1;
+
+        if (!options || !*options)
+                return 1;
+
+        while ((this_opt = strsep(&options, ",")) != NULL) {
+                if (!*this_opt)
+                        continue;
+                if (!strncmp(this_opt, "disable", 7))
+                        vfb_enable = 0;
+        }
+        return 1;
+}
+#endif  /*  MODULE  */
+
+    /*
+     *  Initialisation
+     */
+
+static void vfb_platform_release(struct device *device)
+{
+        // This is called when the reference count goes to zero.
+}
+
+static int __init vfb_probe(struct device *device)
+{
+        struct platform_device *dev = to_platform_device(device);
+        struct fb_info *info;
+        int retval = -ENOMEM;
+
+        /*
+         * For real video cards we use ioremap.
+         */
+        if (!(videomemory = vmalloc(videomemorysize)))
+                return retval;
+
+        /*
+         * VFB must clear memory to prevent kernel info
+         * leakage into userspace
+         * VGA-based drivers MUST NOT clear memory if
+         * they want to be able to take over vgacon
+         */
+        memset(videomemory, 0, videomemorysize);
+
+        info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
+        if (!info)
+                goto err;
+
+        info->screen_base = (char __iomem *)videomemory;
+        info->fbops = &vfb_ops;
+
+        retval = fb_find_mode(&info->var, info, NULL,
+                              NULL, 0, NULL, 8);
+
+        if (!retval || (retval == 4))
+                info->var = vfb_default;
+        info->fix = vfb_fix;
+        info->pseudo_palette = info->par;
+        info->par = NULL;
+        info->flags = FBINFO_FLAG_DEFAULT;
+
+        retval = fb_alloc_cmap(&info->cmap, 256, 0);
+        if (retval < 0)
+                goto err1;
+
+        retval = register_framebuffer(info);
+        if (retval < 0)
+                goto err2;
+        dev_set_drvdata(&dev->dev, info);
+
+        printk(KERN_INFO
+               "fb%d: Virtual frame buffer device, using %ldK of video memory\n",
+               info->node, videomemorysize >> 10);
+        return 0;
+err2:
+        fb_dealloc_cmap(&info->cmap);
+err1:
+        framebuffer_release(info);
+err:
+        vfree(videomemory);
+        return retval;
+}
+
+static int vfb_remove(struct device *device)
+{
+        struct fb_info *info = dev_get_drvdata(device);
+
+        if (info) {
+                unregister_framebuffer(info);
+                vfree(videomemory);
+                framebuffer_release(info);
+        }
+        return 0;
+}
+
+static struct device_driver vfb_driver = {
+        .name   = "vfb",
+        .bus    = &platform_bus_type,
+        .probe  = vfb_probe,
+        .remove = vfb_remove,
+};
+
+static struct platform_device vfb_device = {
+        .name   = "vfb",
+        .id     = 0,
+        .dev    = {
+                .release = vfb_platform_release,
+        }
+};
+
+static int __init vfb_init(void)
+{
+        int ret = 0;
+
+#ifndef MODULE
+        char *option = NULL;
+
+        if (fb_get_options("vfb", &option))
+                return -ENODEV;
+        vfb_setup(option);
+#endif
+
+        if (!vfb_enable)
+                return -ENXIO;
+
+        ret = driver_register(&vfb_driver);
+
+        if (!ret) {
+                ret = platform_device_register(&vfb_device);
+                if (ret)
+                        driver_unregister(&vfb_driver);
+        }
+        return ret;
+}
+
+module_init(vfb_init);
+
+#ifdef MODULE
+static void __exit vfb_exit(void)
+{
+        platform_device_unregister(&vfb_device);
+        driver_unregister(&vfb_driver);
+}
+
+module_exit(vfb_exit);
+
+MODULE_LICENSE("GPL");
+#endif                          /* MODULE */