| 1 | |
| 2 | *
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| 3 | * License: GPL
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| 4 | *
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| 5 | * Copyright (C) 2010 David S. Miller ([email protected])
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| 6 |
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| 7 |
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| 8 | #include <linux/kernel.h>
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| 9 | #include <linux/fb.h>
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| 10 | #include <linux/init.h>
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| 11 | #include <linux/of.h>
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| 12 | #include <linux/platform_device.h>
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| 13 |
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| 14 | struct gfb_info {
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| 15 | struct fb_info *info;
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| 16 |
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| 17 | char __iomem *fb_base;
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| 18 | unsigned long fb_base_phys;
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| 19 |
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| 20 | struct device_node *of_node;
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| 21 |
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| 22 | unsigned int width;
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| 23 | unsigned int height;
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| 24 | unsigned int depth;
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| 25 | unsigned int fb_size;
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| 26 |
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| 27 | u32 pseudo_palette[16];
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| 28 | };
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| 29 |
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| 30 | static int gfb_get_props(struct gfb_info *gp)
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| 31 | {
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| 32 | gp->width = of_getintprop_default(gp->of_node, "width", 0);
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| 33 | gp->height = of_getintprop_default(gp->of_node, "height", 0);
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| 34 | gp->depth = of_getintprop_default(gp->of_node, "depth", 32);
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| 35 |
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| 36 | if (!gp->width || !gp->height) {
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| 37 | printk(KERN_ERR "gfb: Critical properties missing for %pOF\n",
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| 38 | gp->of_node);
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| 39 | return -EINVAL;
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| 40 | }
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| 41 |
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| 42 | return 0;
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| 43 | }
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| 44 |
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| 45 | static int gfb_setcolreg(unsigned regno,
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| 46 | unsigned red, unsigned green, unsigned blue,
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| 47 | unsigned transp, struct fb_info *info)
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| 48 | {
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| 49 | u32 value;
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| 50 |
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| 51 | if (regno < 16) {
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| 52 | red >>= 8;
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| 53 | green >>= 8;
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| 54 | blue >>= 8;
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| 55 |
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| 56 | value = (blue << 16) | (green << 8) | red;
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| 57 | ((u32 *)info->pseudo_palette)[regno] = value;
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| 58 | }
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| 59 |
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| 60 | return 0;
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| 61 | }
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| 62 |
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| 63 | static const struct fb_ops gfb_ops = {
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| 64 | .owner = THIS_MODULE,
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| 65 | FB_DEFAULT_IOMEM_OPS,
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| 66 | .fb_setcolreg = gfb_setcolreg,
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| 67 | };
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| 68 |
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| 69 | static int gfb_set_fbinfo(struct gfb_info *gp)
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| 70 | {
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| 71 | struct fb_info *info = gp->info;
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| 72 | struct fb_var_screeninfo *var = &info->var;
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| 73 |
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| 74 | info->fbops = &gfb_ops;
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| 75 | info->screen_base = gp->fb_base;
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| 76 | info->screen_size = gp->fb_size;
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| 77 |
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| 78 | info->pseudo_palette = gp->pseudo_palette;
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| 79 |
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| 80 |
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| 81 | strscpy(info->fix.id, "gfb", sizeof(info->fix.id));
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| 82 | info->fix.smem_start = gp->fb_base_phys;
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| 83 | info->fix.smem_len = gp->fb_size;
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| 84 | info->fix.type = FB_TYPE_PACKED_PIXELS;
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| 85 | if (gp->depth == 32 || gp->depth == 24)
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| 86 | info->fix.visual = FB_VISUAL_TRUECOLOR;
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| 87 | else
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| 88 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
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| 89 |
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| 90 | var->xres = gp->width;
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| 91 | var->yres = gp->height;
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| 92 | var->xres_virtual = var->xres;
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| 93 | var->yres_virtual = var->yres;
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| 94 | var->bits_per_pixel = gp->depth;
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| 95 |
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| 96 | var->red.offset = 0;
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| 97 | var->red.length = 8;
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| 98 | var->green.offset = 8;
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| 99 | var->green.length = 8;
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| 100 | var->blue.offset = 16;
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| 101 | var->blue.length = 8;
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| 102 | var->transp.offset = 0;
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| 103 | var->transp.length = 0;
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| 104 |
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| 105 | if (fb_alloc_cmap(&info->cmap, 256, 0)) {
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| 106 | printk(KERN_ERR "gfb: Cannot allocate color map.\n");
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| 107 | return -ENOMEM;
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| 108 | }
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| 109 |
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| 110 | return 0;
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| 111 | }
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| 112 |
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| 113 | static int gfb_probe(struct platform_device *op)
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| 114 | {
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| 115 | struct device_node *dp = op->dev.of_node;
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| 116 | struct fb_info *info;
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| 117 | struct gfb_info *gp;
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| 118 | int err;
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| 119 |
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| 120 | info = framebuffer_alloc(sizeof(struct gfb_info), &op->dev);
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| 121 | if (!info) {
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| 122 | err = -ENOMEM;
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| 123 | goto err_out;
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| 124 | }
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| 125 |
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| 126 | gp = info->par;
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| 127 | gp->info = info;
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| 128 | gp->of_node = dp;
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| 129 |
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| 130 | gp->fb_base_phys = op->resource[6].start;
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| 131 |
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| 132 | err = gfb_get_props(gp);
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| 133 | if (err)
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| 134 | goto err_release_fb;
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| 135 |
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| 136 |
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| 137 | info->fix.line_length = 16384;
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| 138 | gp->fb_size = info->fix.line_length * gp->height;
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| 139 |
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| 140 | gp->fb_base = of_ioremap(&op->resource[6], 0,
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| 141 | gp->fb_size, "gfb fb");
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| 142 | if (!gp->fb_base) {
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| 143 | err = -ENOMEM;
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| 144 | goto err_release_fb;
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| 145 | }
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| 146 |
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| 147 | err = gfb_set_fbinfo(gp);
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| 148 | if (err)
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| 149 | goto err_unmap_fb;
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| 150 |
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| 151 | printk("gfb: Found device at %pOF\n", dp);
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| 152 |
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| 153 | err = register_framebuffer(info);
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| 154 | if (err < 0) {
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| 155 | printk(KERN_ERR "gfb: Could not register framebuffer %pOF\n",
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| 156 | dp);
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| 157 | goto err_unmap_fb;
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| 158 | }
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| 159 |
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| 160 | dev_set_drvdata(&op->dev, info);
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| 161 |
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| 162 | return 0;
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| 163 |
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| 164 | err_unmap_fb:
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| 165 | of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
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| 166 |
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| 167 | err_release_fb:
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| 168 | framebuffer_release(info);
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| 169 |
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| 170 | err_out:
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| 171 | return err;
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| 172 | }
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| 173 |
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| 174 | static const struct of_device_id gfb_match[] = {
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| 175 | {
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| 176 | .name = "SUNW,gfb",
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| 177 | },
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| 178 | {},
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| 179 | };
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| 180 |
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| 181 | static struct platform_driver gfb_driver = {
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| 182 | .probe = gfb_probe,
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| 183 | .driver = {
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| 184 | .name = "gfb",
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| 185 | .of_match_table = gfb_match,
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| 186 | .suppress_bind_attrs = true,
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| 187 | },
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| 188 | };
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| 189 |
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| 190 | static int __init gfb_init(void)
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| 191 | {
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| 192 | if (fb_get_options("gfb", NULL))
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| 193 | return -ENODEV;
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| 194 |
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| 195 | return platform_driver_register(&gfb_driver);
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| 196 | }
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| 197 | device_initcall(gfb_init);
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