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Subject[PATCH 4/9] video: vesafb: allow building as module
Date
From: David Herrmann <dh.herrmann@googlemail.com>

Fix the vesafb module to no longer use any static __init data. Also add a
module_exit() function that destroys the platform device.

Note that fbdev hotplugging is broken and the self-reference actually
prevents sane module-unloading. Anyway, this at least allows delayed
module loading of vesafb and helps debugging vesafb a lot.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
---
drivers/video/Kconfig | 2 +-
drivers/video/vesafb.c | 100 +++++++++++++++++++++++++++++++------------------
2 files changed, 64 insertions(+), 38 deletions(-)

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index eac56ef..d5723c2 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -770,7 +770,7 @@ config FB_UVESA
If unsure, say N.

config FB_VESA
- bool "VESA VGA graphics support"
+ tristate "VESA VGA graphics support"
depends on (FB = y) && X86
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
diff --git a/drivers/video/vesafb.c b/drivers/video/vesafb.c
index 501b340..4ad7b40 100644
--- a/drivers/video/vesafb.c
+++ b/drivers/video/vesafb.c
@@ -29,27 +29,10 @@

/* --------------------------------------------------------------------- */

-static struct fb_var_screeninfo vesafb_defined __initdata = {
- .activate = FB_ACTIVATE_NOW,
- .height = -1,
- .width = -1,
- .right_margin = 32,
- .upper_margin = 16,
- .lower_margin = 4,
- .vsync_len = 4,
- .vmode = FB_VMODE_NONINTERLACED,
-};
-
-static struct fb_fix_screeninfo vesafb_fix __initdata = {
- .id = "VESA VGA",
- .type = FB_TYPE_PACKED_PIXELS,
- .accel = FB_ACCEL_NONE,
-};
-
static int inverse __read_mostly;
static int mtrr __read_mostly; /* disable mtrr */
-static int vram_remap __initdata; /* Set amount of memory to be used */
-static int vram_total __initdata; /* Set total amount of memory */
+static int vram_remap; /* Set amount of memory to be used */
+static int vram_total; /* Set total amount of memory */
static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */
static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */
static void (*pmi_start)(void) __read_mostly;
@@ -58,6 +41,11 @@ static int depth __read_mostly;
static int vga_compat __read_mostly;
/* --------------------------------------------------------------------- */

+struct vesafb_par {
+ struct fb_ops ops;
+ u32 palette[256];
+};
+
static int vesafb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
@@ -182,7 +170,7 @@ static void vesafb_destroy(struct fb_info *info)
framebuffer_release(info);
}

-static struct fb_ops vesafb_ops = {
+static const struct fb_ops vesafb_ops = {
.owner = THIS_MODULE,
.fb_destroy = vesafb_destroy,
.fb_setcolreg = vesafb_setcolreg,
@@ -192,7 +180,7 @@ static struct fb_ops vesafb_ops = {
.fb_imageblit = cfb_imageblit,
};

-static int __init vesafb_setup(char *options)
+static int vesafb_setup(char *options)
{
char *this_opt;

@@ -226,13 +214,29 @@ static int __init vesafb_setup(char *options)
return 0;
}

-static int __init vesafb_probe(struct platform_device *dev)
+static int vesafb_probe(struct platform_device *dev)
{
struct fb_info *info;
+ struct vesafb_par *par;
int i, err;
unsigned int size_vmode;
unsigned int size_remap;
unsigned int size_total;
+ struct fb_var_screeninfo vesafb_defined = {
+ .activate = FB_ACTIVATE_NOW,
+ .height = -1,
+ .width = -1,
+ .right_margin = 32,
+ .upper_margin = 16,
+ .lower_margin = 4,
+ .vsync_len = 4,
+ .vmode = FB_VMODE_NONINTERLACED,
+ };
+ struct fb_fix_screeninfo vesafb_fix = {
+ .id = "VESA VGA",
+ .type = FB_TYPE_PACKED_PIXELS,
+ .accel = FB_ACCEL_NONE,
+ };

if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
return -ENODEV;
@@ -287,13 +291,14 @@ static int __init vesafb_probe(struct platform_device *dev)
spaces our resource handlers simply don't know about */
}

- info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
+ info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev);
if (!info) {
release_mem_region(vesafb_fix.smem_start, size_total);
return -ENOMEM;
}
- info->pseudo_palette = info->par;
- info->par = NULL;
+ par = info->par;
+ par->ops = vesafb_ops;
+ info->pseudo_palette = par->palette;

/* set vesafb aperture size for generic probing */
info->apertures = alloc_apertures(1);
@@ -466,7 +471,7 @@ static int __init vesafb_probe(struct platform_device *dev)
vesafb_fix.smem_start, info->screen_base,
size_remap/1024, size_total/1024);

- info->fbops = &vesafb_ops;
+ info->fbops = &par->ops;
info->var = vesafb_defined;
info->fix = vesafb_fix;
info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
@@ -486,6 +491,7 @@ static int __init vesafb_probe(struct platform_device *dev)
}
printk(KERN_INFO "fb%d: %s frame buffer device\n",
info->node, info->fix.id);
+ platform_set_drvdata(dev, info);
return 0;
err:
if (info->screen_base)
@@ -495,7 +501,17 @@ err:
return err;
}

+static int vesafb_remove(struct platform_device *dev)
+{
+ struct fb_info *info = platform_get_drvdata(dev);
+
+ unregister_framebuffer(info);
+ return 0;
+}
+
static struct platform_driver vesafb_driver = {
+ .probe = vesafb_probe,
+ .remove = vesafb_remove,
.driver = {
.name = "vesafb",
},
@@ -512,24 +528,34 @@ static int __init vesafb_init(void)
fb_get_options("vesafb", &option);
vesafb_setup(option);

- vesafb_device = platform_device_alloc("vesafb", 0);
+ vesafb_device = platform_device_alloc("vesafb", -1);
if (!vesafb_device)
return -ENOMEM;

+ ret = platform_driver_register(&vesafb_driver);
+ if (ret)
+ goto err_dev;
+
ret = platform_device_add(vesafb_device);
- if (!ret) {
- ret = platform_driver_probe(&vesafb_driver, vesafb_probe);
- if (ret)
- platform_device_del(vesafb_device);
- }
+ if (ret)
+ goto err_drv;

- if (ret) {
- platform_device_put(vesafb_device);
- vesafb_device = NULL;
- }
+ return 0;

+err_drv:
+ platform_driver_unregister(&vesafb_driver);
+err_dev:
+ platform_device_put(vesafb_device);
return ret;
}
-module_init(vesafb_init);

+static void __exit vesafb_exit(void)
+{
+ platform_device_del(vesafb_device);
+ platform_device_put(vesafb_device);
+ platform_driver_unregister(&vesafb_driver);
+}
+
+module_init(vesafb_init);
+module_exit(vesafb_exit);
MODULE_LICENSE("GPL");
--
1.8.1.3


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