![Jani Nikula](/assets/img/avatar_default.png)
Now that the fbops member of struct fb_info is const, we can start making the ops const as well. This does not cover all drivers; some actually modify the fbops struct, for example to adjust for different configurations, and others do more involved things that I'd rather not touch in practically obsolete drivers. Mostly this is the low hanging fruit where we can add "const" and be done with it. v3: - un-constify atyfb, mb862xx, nvidia and uvesabf (0day) v2: - fix typo (Christophe de Dinechin) - use "static const" instead of "const static" in mx3fb.c - also constify smscufx.c Cc: linux-fbdev@vger.kernel.org Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/ce67f14435f3af498f2e8bf35ce4be11f7504132.1575390740.git.jani.nikula@intel.com
200 lines
4 KiB
C
200 lines
4 KiB
C
/* sunxvr1000.c: Sun XVR-1000 fb driver for sparc64 systems
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*
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* License: GPL
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*
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* Copyright (C) 2010 David S. Miller (davem@davemloft.net)
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*/
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#include <linux/kernel.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/of_device.h>
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struct gfb_info {
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struct fb_info *info;
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char __iomem *fb_base;
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unsigned long fb_base_phys;
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struct device_node *of_node;
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unsigned int width;
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unsigned int height;
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unsigned int depth;
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unsigned int fb_size;
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u32 pseudo_palette[16];
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};
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static int gfb_get_props(struct gfb_info *gp)
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{
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gp->width = of_getintprop_default(gp->of_node, "width", 0);
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gp->height = of_getintprop_default(gp->of_node, "height", 0);
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gp->depth = of_getintprop_default(gp->of_node, "depth", 32);
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if (!gp->width || !gp->height) {
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printk(KERN_ERR "gfb: Critical properties missing for %pOF\n",
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gp->of_node);
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return -EINVAL;
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}
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return 0;
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}
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static int gfb_setcolreg(unsigned regno,
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unsigned red, unsigned green, unsigned blue,
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unsigned transp, struct fb_info *info)
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{
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u32 value;
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if (regno < 16) {
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red >>= 8;
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green >>= 8;
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blue >>= 8;
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value = (blue << 16) | (green << 8) | red;
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((u32 *)info->pseudo_palette)[regno] = value;
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}
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return 0;
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}
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static const struct fb_ops gfb_ops = {
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.owner = THIS_MODULE,
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.fb_setcolreg = gfb_setcolreg,
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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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static int gfb_set_fbinfo(struct gfb_info *gp)
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{
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struct fb_info *info = gp->info;
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struct fb_var_screeninfo *var = &info->var;
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info->flags = FBINFO_DEFAULT;
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info->fbops = &gfb_ops;
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info->screen_base = gp->fb_base;
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info->screen_size = gp->fb_size;
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info->pseudo_palette = gp->pseudo_palette;
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/* Fill fix common fields */
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strlcpy(info->fix.id, "gfb", sizeof(info->fix.id));
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info->fix.smem_start = gp->fb_base_phys;
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info->fix.smem_len = gp->fb_size;
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info->fix.type = FB_TYPE_PACKED_PIXELS;
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if (gp->depth == 32 || gp->depth == 24)
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info->fix.visual = FB_VISUAL_TRUECOLOR;
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else
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info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
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var->xres = gp->width;
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var->yres = gp->height;
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var->xres_virtual = var->xres;
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var->yres_virtual = var->yres;
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var->bits_per_pixel = gp->depth;
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var->red.offset = 0;
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var->red.length = 8;
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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;
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var->transp.length = 0;
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if (fb_alloc_cmap(&info->cmap, 256, 0)) {
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printk(KERN_ERR "gfb: Cannot allocate color map.\n");
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return -ENOMEM;
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}
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return 0;
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}
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static int gfb_probe(struct platform_device *op)
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{
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struct device_node *dp = op->dev.of_node;
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struct fb_info *info;
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struct gfb_info *gp;
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int err;
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info = framebuffer_alloc(sizeof(struct gfb_info), &op->dev);
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if (!info) {
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err = -ENOMEM;
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goto err_out;
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}
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gp = info->par;
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gp->info = info;
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gp->of_node = dp;
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gp->fb_base_phys = op->resource[6].start;
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err = gfb_get_props(gp);
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if (err)
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goto err_release_fb;
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/* Framebuffer length is the same regardless of resolution. */
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info->fix.line_length = 16384;
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gp->fb_size = info->fix.line_length * gp->height;
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gp->fb_base = of_ioremap(&op->resource[6], 0,
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gp->fb_size, "gfb fb");
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if (!gp->fb_base) {
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err = -ENOMEM;
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goto err_release_fb;
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}
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err = gfb_set_fbinfo(gp);
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if (err)
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goto err_unmap_fb;
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printk("gfb: Found device at %pOF\n", dp);
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err = register_framebuffer(info);
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if (err < 0) {
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printk(KERN_ERR "gfb: Could not register framebuffer %pOF\n",
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dp);
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goto err_unmap_fb;
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}
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dev_set_drvdata(&op->dev, info);
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return 0;
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err_unmap_fb:
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of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
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err_release_fb:
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framebuffer_release(info);
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err_out:
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return err;
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}
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static const struct of_device_id gfb_match[] = {
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{
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.name = "SUNW,gfb",
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},
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{},
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};
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static struct platform_driver gfb_driver = {
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.probe = gfb_probe,
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.driver = {
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.name = "gfb",
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.of_match_table = gfb_match,
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.suppress_bind_attrs = true,
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},
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};
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static int __init gfb_init(void)
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{
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if (fb_get_options("gfb", NULL))
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return -ENODEV;
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return platform_driver_register(&gfb_driver);
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}
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device_initcall(gfb_init);
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