Re: [PATCH] Add new linearfb driver
From: Peter Jones
Date: Wed Aug 25 2010 - 11:03:45 EST
On 08/25/2010 10:11 AM, Colin Watson wrote:
> Split out linearfb from efifb so that boot loaders can program it as a
> simple linear framebuffer on non-EFI systems. This is useful for boot
> loaders with their own graphics drivers, e.g. GRUB 2, since in some
> cases on x86 they can set up non-VESA modes and thus can't program
> vesafb.
>
> efifb is reworked on top of this common code, and it should be possible
> to do the same with some other framebuffer drivers in future.
>
> Signed-off-by: Colin Watson <cjwatson@xxxxxxxxxxxxx>
> Acked-by: Matthew Garrett <mjg@xxxxxxxxxx>
> Cc: Peter Jones <pjones@xxxxxxxxxx>
Looks reasonable to me.
Acked-by: Peter Jones <pjones@xxxxxxxxxx>
> ---
> drivers/video/Kconfig | 17 ++-
> drivers/video/Makefile | 1 +
> drivers/video/efifb.c | 222 +----------------------------
> drivers/video/linearfb.c | 332 +++++++++++++++++++++++++++++++++++++++++++
> include/linux/fb.h | 8 +
> include/linux/screen_info.h | 2 +
> 6 files changed, 364 insertions(+), 218 deletions(-)
> create mode 100644 drivers/video/linearfb.c
>
> diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
> index 59c51d9..a7735ec 100644
> --- a/drivers/video/Kconfig
> +++ b/drivers/video/Kconfig
> @@ -721,13 +721,24 @@ config FB_VESA
> You will get a boot time penguin logo at no additional cost. Please
> read <file:Documentation/fb/vesafb.txt>. If unsure, say Y.
>
> -config FB_EFI
> - bool "EFI-based Framebuffer Support"
> - depends on (FB = y) && X86 && EFI
> +config FB_LINEAR
> + bool "Simple linear framebuffer support"
> + depends on FB
> select FB_CFB_FILLRECT
> select FB_CFB_COPYAREA
> select FB_CFB_IMAGEBLIT
> help
> + This is a simple linear frame buffer device driver. It has no
> + hardware-specific programming capability, but must be programmed
> + by the boot loader or by another frame buffer driver.
> +
> + If unsure, say N.
> +
> +config FB_EFI
> + bool "EFI-based Framebuffer Support"
> + depends on (FB = y) && X86 && EFI
> + select FB_LINEAR
> + help
> This is the EFI frame buffer device driver. If the firmware on
> your platform is EFI 1.10 or UEFI 2.0, select Y to add support for
> using the EFI framebuffer as your console.
> diff --git a/drivers/video/Makefile b/drivers/video/Makefile
> index ddc2af2..ad74d3b 100644
> --- a/drivers/video/Makefile
> +++ b/drivers/video/Makefile
> @@ -133,6 +133,7 @@ obj-$(CONFIG_FB_MSM) += msm/
> obj-$(CONFIG_FB_NUC900) += nuc900fb.o
>
> # Platform or fallback drivers go here
> +obj-$(CONFIG_FB_LINEAR) += linearfb.o
> obj-$(CONFIG_FB_UVESA) += uvesafb.o
> obj-$(CONFIG_FB_VESA) += vesafb.o
> obj-$(CONFIG_FB_EFI) += efifb.o
> diff --git a/drivers/video/efifb.c b/drivers/video/efifb.c
> index 4a56f46..72e5873 100644
> --- a/drivers/video/efifb.c
> +++ b/drivers/video/efifb.c
> @@ -16,24 +16,6 @@
>
> #include <video/vga.h>
>
> -static struct fb_var_screeninfo efifb_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 efifb_fix __initdata = {
> - .id = "EFI VGA",
> - .type = FB_TYPE_PACKED_PIXELS,
> - .accel = FB_ACCEL_NONE,
> - .visual = FB_VISUAL_TRUECOLOR,
> -};
> -
> enum {
> M_I17, /* 17-Inch iMac */
> M_I20, /* 20-Inch iMac */
> @@ -138,49 +120,6 @@ static int set_system(const struct dmi_system_id *id)
> return 0;
> }
>
> -static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
> - unsigned blue, unsigned transp,
> - struct fb_info *info)
> -{
> - /*
> - * 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.
> - */
> -
> - if (regno >= info->cmap.len)
> - return 1;
> -
> - if (regno < 16) {
> - red >>= 8;
> - green >>= 8;
> - blue >>= 8;
> - ((u32 *)(info->pseudo_palette))[regno] =
> - (red << info->var.red.offset) |
> - (green << info->var.green.offset) |
> - (blue << info->var.blue.offset);
> - }
> - return 0;
> -}
> -
> -static void efifb_destroy(struct fb_info *info)
> -{
> - if (info->screen_base)
> - iounmap(info->screen_base);
> - release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
> - framebuffer_release(info);
> -}
> -
> -static struct fb_ops efifb_ops = {
> - .owner = THIS_MODULE,
> - .fb_destroy = efifb_destroy,
> - .fb_setcolreg = efifb_setcolreg,
> - .fb_fillrect = cfb_fillrect,
> - .fb_copyarea = cfb_copyarea,
> - .fb_imageblit = cfb_imageblit,
> -};
> -
> static int __init efifb_setup(char *options)
> {
> char *this_opt;
> @@ -215,171 +154,24 @@ static int __init efifb_setup(char *options)
>
> static int __devinit efifb_probe(struct platform_device *dev)
> {
> - struct fb_info *info;
> int err;
> - unsigned int size_vmode;
> - unsigned int size_remap;
> - unsigned int size_total;
> - int request_succeeded = 0;
> -
> - if (!screen_info.lfb_depth)
> - screen_info.lfb_depth = 32;
> - if (!screen_info.pages)
> - screen_info.pages = 1;
> - if (!screen_info.lfb_base) {
> - printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
> - return -ENODEV;
> - }
> - printk(KERN_INFO "efifb: probing for efifb\n");
> -
> - /* just assume they're all unset if any are */
> - if (!screen_info.blue_size) {
> - screen_info.blue_size = 8;
> - screen_info.blue_pos = 0;
> - screen_info.green_size = 8;
> - screen_info.green_pos = 8;
> - screen_info.red_size = 8;
> - screen_info.red_pos = 16;
> - screen_info.rsvd_size = 8;
> - screen_info.rsvd_pos = 24;
> - }
> -
> - efifb_fix.smem_start = screen_info.lfb_base;
> - efifb_defined.bits_per_pixel = screen_info.lfb_depth;
> - efifb_defined.xres = screen_info.lfb_width;
> - efifb_defined.yres = screen_info.lfb_height;
> - efifb_fix.line_length = screen_info.lfb_linelength;
> -
> - /* size_vmode -- that is the amount of memory needed for the
> - * used video mode, i.e. the minimum amount of
> - * memory we need. */
> - size_vmode = efifb_defined.yres * efifb_fix.line_length;
> -
> - /* size_total -- all video memory we have. Used for
> - * entries, ressource allocation and bounds
> - * checking. */
> - size_total = screen_info.lfb_size;
> - if (size_total < size_vmode)
> - size_total = size_vmode;
> -
> - /* size_remap -- the amount of video memory we are going to
> - * use for efifb. With modern cards it is no
> - * option to simply use size_total as that
> - * wastes plenty of kernel address space. */
> - size_remap = size_vmode * 2;
> - if (size_remap > size_total)
> - size_remap = size_total;
> - if (size_remap % PAGE_SIZE)
> - size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
> - efifb_fix.smem_len = size_remap;
> -
> - if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
> - request_succeeded = 1;
> - } else {
> - /* We cannot make this fatal. Sometimes this comes from magic
> - spaces our resource handlers simply don't know about */
> - printk(KERN_WARNING
> - "efifb: cannot reserve video memory at 0x%lx\n",
> - efifb_fix.smem_start);
> - }
> -
> - info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
> - if (!info) {
> - printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
> - err = -ENOMEM;
> - goto err_release_mem;
> - }
> - info->pseudo_palette = info->par;
> - info->par = NULL;
> -
> - info->apertures = alloc_apertures(1);
> - if (!info->apertures) {
> - err = -ENOMEM;
> - goto err_release_fb;
> - }
> - info->apertures->ranges[0].base = efifb_fix.smem_start;
> - info->apertures->ranges[0].size = size_remap;
> -
> - info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);
> - if (!info->screen_base) {
> - printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
> - "0x%x @ 0x%lx\n",
> - efifb_fix.smem_len, efifb_fix.smem_start);
> - err = -EIO;
> - goto err_release_fb;
> - }
> -
> - printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
> - "using %dk, total %dk\n",
> - efifb_fix.smem_start, info->screen_base,
> - size_remap/1024, size_total/1024);
> - printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
> - efifb_defined.xres, efifb_defined.yres,
> - efifb_defined.bits_per_pixel, efifb_fix.line_length,
> - screen_info.pages);
> -
> - efifb_defined.xres_virtual = efifb_defined.xres;
> - efifb_defined.yres_virtual = efifb_fix.smem_len /
> - efifb_fix.line_length;
> - printk(KERN_INFO "efifb: scrolling: redraw\n");
> - efifb_defined.yres_virtual = efifb_defined.yres;
> -
> - /* some dummy values for timing to make fbset happy */
> - efifb_defined.pixclock = 10000000 / efifb_defined.xres *
> - 1000 / efifb_defined.yres;
> - efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
> - efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
> -
> - efifb_defined.red.offset = screen_info.red_pos;
> - efifb_defined.red.length = screen_info.red_size;
> - efifb_defined.green.offset = screen_info.green_pos;
> - efifb_defined.green.length = screen_info.green_size;
> - efifb_defined.blue.offset = screen_info.blue_pos;
> - efifb_defined.blue.length = screen_info.blue_size;
> - efifb_defined.transp.offset = screen_info.rsvd_pos;
> - efifb_defined.transp.length = screen_info.rsvd_size;
> -
> - printk(KERN_INFO "efifb: %s: "
> - "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
> - "Truecolor",
> - screen_info.rsvd_size,
> - screen_info.red_size,
> - screen_info.green_size,
> - screen_info.blue_size,
> - screen_info.rsvd_pos,
> - screen_info.red_pos,
> - screen_info.green_pos,
> - screen_info.blue_pos);
> -
> - efifb_fix.ypanstep = 0;
> - efifb_fix.ywrapstep = 0;
> + struct fb_info *info;
>
> - info->fbops = &efifb_ops;
> - info->var = efifb_defined;
> - info->fix = efifb_fix;
> - info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
> + if ((err = linearfb_get_info(dev, &info)) < 0)
> + return err;
>
> - if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
> - printk(KERN_ERR "efifb: cannot allocate colormap\n");
> - goto err_unmap;
> - }
> + strcpy(info->fix.id, "EFI VGA");
> if ((err = register_framebuffer(info)) < 0) {
> printk(KERN_ERR "efifb: cannot register framebuffer\n");
> - goto err_fb_dealoc;
> + goto err_fb_dealloc;
> }
> printk(KERN_INFO "fb%d: %s frame buffer device\n",
> info->node, info->fix.id);
> return 0;
>
> -err_fb_dealoc:
> +err_fb_dealloc:
> fb_dealloc_cmap(&info->cmap);
> -err_unmap:
> - iounmap(info->screen_base);
> -err_release_fb:
> - framebuffer_release(info);
> -err_release_mem:
> - if (request_succeeded)
> - release_mem_region(efifb_fix.smem_start, size_total);
> + linearfb_destroy(info);
> return err;
> }
>
> diff --git a/drivers/video/linearfb.c b/drivers/video/linearfb.c
> new file mode 100644
> index 0000000..c93eaac
> --- /dev/null
> +++ b/drivers/video/linearfb.c
> @@ -0,0 +1,332 @@
> +/*
> + * Simple linear framebuffer driver
> + *
> + * This driver does not have any real probing capability; using it requires
> + * programming, either by the boot loader or by another framebuffer driver.
> + *
> + * (c) 2006 Edgar Hucek <gimli@xxxxxxxxxxxxxx>
> + * Original efi driver written by Gerd Knorr <kraxel@xxxxxxxxxxxxxxxxxxxxx>
> + * Split out to linearfb by Colin Watson <cjwatson@xxxxxxxxxx>
> + *
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/errno.h>
> +#include <linux/fb.h>
> +#include <linux/platform_device.h>
> +#include <linux/screen_info.h>
> +
> +#include <video/vga.h>
> +
> +static struct fb_var_screeninfo linearfb_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 linearfb_fix __initdata = {
> + .id = "Linear",
> + .type = FB_TYPE_PACKED_PIXELS,
> + .accel = FB_ACCEL_NONE,
> + .visual = FB_VISUAL_TRUECOLOR,
> +};
> +
> +static int linearfb_setcolreg(unsigned regno, unsigned red, unsigned green,
> + unsigned blue, unsigned transp,
> + struct fb_info *info)
> +{
> + /*
> + * 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.
> + */
> +
> + if (regno >= info->cmap.len)
> + return 1;
> +
> + if (regno < 16) {
> + red >>= 8;
> + green >>= 8;
> + blue >>= 8;
> + ((u32 *)(info->pseudo_palette))[regno] =
> + (red << info->var.red.offset) |
> + (green << info->var.green.offset) |
> + (blue << info->var.blue.offset);
> + }
> + return 0;
> +}
> +
> +void linearfb_destroy(struct fb_info *info)
> +{
> + if (info->screen_base)
> + iounmap(info->screen_base);
> + release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
> + framebuffer_release(info);
> +}
> +EXPORT_SYMBOL(linearfb_destroy);
> +
> +static struct fb_ops linearfb_ops = {
> + .owner = THIS_MODULE,
> + .fb_destroy = linearfb_destroy,
> + .fb_setcolreg = linearfb_setcolreg,
> + .fb_fillrect = cfb_fillrect,
> + .fb_copyarea = cfb_copyarea,
> + .fb_imageblit = cfb_imageblit,
> +};
> +
> +static int __init linearfb_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, "base:", 5))
> + screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
> + else if (!strncmp(this_opt, "stride:", 7))
> + screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
> + else if (!strncmp(this_opt, "height:", 7))
> + screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
> + else if (!strncmp(this_opt, "width:", 6))
> + screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
> + }
> + return 0;
> +}
> +
> +int linearfb_get_info(struct platform_device *dev, struct fb_info **p_info)
> +{
> + int err;
> + unsigned int size_vmode;
> + unsigned int size_remap;
> + unsigned int size_total;
> + int request_succeeded = 0;
> + struct fb_info *info;
> +
> + if (!screen_info.lfb_depth)
> + screen_info.lfb_depth = 32;
> + if (!screen_info.pages)
> + screen_info.pages = 1;
> + if (!screen_info.lfb_base) {
> + printk(KERN_DEBUG "linearfb: invalid framebuffer address\n");
> + return -ENODEV;
> + }
> + printk(KERN_INFO "linearfb: probing for linearfb\n");
> +
> + /* just assume they're all unset if any are */
> + if (!screen_info.blue_size) {
> + screen_info.blue_size = 8;
> + screen_info.blue_pos = 0;
> + screen_info.green_size = 8;
> + screen_info.green_pos = 8;
> + screen_info.red_size = 8;
> + screen_info.red_pos = 16;
> + screen_info.rsvd_size = 8;
> + screen_info.rsvd_pos = 24;
> + }
> +
> + linearfb_fix.smem_start = screen_info.lfb_base;
> + linearfb_defined.bits_per_pixel = screen_info.lfb_depth;
> + linearfb_defined.xres = screen_info.lfb_width;
> + linearfb_defined.yres = screen_info.lfb_height;
> + linearfb_fix.line_length = screen_info.lfb_linelength;
> +
> + /* size_vmode -- that is the amount of memory needed for the
> + * used video mode, i.e. the minimum amount of
> + * memory we need. */
> + size_vmode = linearfb_defined.yres * linearfb_fix.line_length;
> +
> + /* size_total -- all video memory we have. Used for
> + * entries, ressource allocation and bounds
> + * checking. */
> + size_total = screen_info.lfb_size;
> + if (size_total < size_vmode)
> + size_total = size_vmode;
> +
> + /* size_remap -- the amount of video memory we are going to
> + * use for linearfb. With modern cards it is no
> + * option to simply use size_total as that
> + * wastes plenty of kernel address space. */
> + size_remap = size_vmode * 2;
> + if (size_remap > size_total)
> + size_remap = size_total;
> + if (size_remap % PAGE_SIZE)
> + size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
> + linearfb_fix.smem_len = size_remap;
> +
> + if (request_mem_region(linearfb_fix.smem_start, size_remap,
> + "linearfb")) {
> + request_succeeded = 1;
> + } else {
> + /* We cannot make this fatal. Sometimes this comes from magic
> + spaces our resource handlers simply don't know about */
> + printk(KERN_WARNING
> + "linearfb: cannot reserve video memory at 0x%lx\n",
> + linearfb_fix.smem_start);
> + }
> +
> + info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
> + if (!info) {
> + printk(KERN_ERR "linearfb: cannot allocate framebuffer\n");
> + err = -ENOMEM;
> + goto err_release_mem;
> + }
> + info->pseudo_palette = info->par;
> + info->par = NULL;
> +
> + info->apertures = alloc_apertures(1);
> + if (!info->apertures) {
> + err = -ENOMEM;
> + goto err_release_fb;
> + }
> + info->apertures->ranges[0].base = linearfb_fix.smem_start;
> + info->apertures->ranges[0].size = size_remap;
> +
> + info->screen_base = ioremap(linearfb_fix.smem_start,
> + linearfb_fix.smem_len);
> + if (!info->screen_base) {
> + printk(KERN_ERR "linearfb: abort, cannot ioremap video memory "
> + "0x%x @ 0x%lx\n",
> + linearfb_fix.smem_len, linearfb_fix.smem_start);
> + err = -EIO;
> + goto err_release_fb;
> + }
> +
> + printk(KERN_INFO "linearfb: framebuffer at 0x%lx, mapped to 0x%p, "
> + "using %dk, total %dk\n",
> + linearfb_fix.smem_start, info->screen_base,
> + size_remap/1024, size_total/1024);
> + printk(KERN_INFO
> + "linearfb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
> + linearfb_defined.xres, linearfb_defined.yres,
> + linearfb_defined.bits_per_pixel, linearfb_fix.line_length,
> + screen_info.pages);
> +
> + linearfb_defined.xres_virtual = linearfb_defined.xres;
> + linearfb_defined.yres_virtual = linearfb_fix.smem_len /
> + linearfb_fix.line_length;
> + printk(KERN_INFO "linearfb: scrolling: redraw\n");
> + linearfb_defined.yres_virtual = linearfb_defined.yres;
> +
> + /* some dummy values for timing to make fbset happy */
> + linearfb_defined.pixclock = 10000000 / linearfb_defined.xres *
> + 1000 / linearfb_defined.yres;
> + linearfb_defined.left_margin = (linearfb_defined.xres / 8) & 0xf8;
> + linearfb_defined.hsync_len = (linearfb_defined.xres / 8) & 0xf8;
> +
> + linearfb_defined.red.offset = screen_info.red_pos;
> + linearfb_defined.red.length = screen_info.red_size;
> + linearfb_defined.green.offset = screen_info.green_pos;
> + linearfb_defined.green.length = screen_info.green_size;
> + linearfb_defined.blue.offset = screen_info.blue_pos;
> + linearfb_defined.blue.length = screen_info.blue_size;
> + linearfb_defined.transp.offset = screen_info.rsvd_pos;
> + linearfb_defined.transp.length = screen_info.rsvd_size;
> +
> + printk(KERN_INFO "linearfb: %s: "
> + "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
> + "Truecolor",
> + screen_info.rsvd_size,
> + screen_info.red_size,
> + screen_info.green_size,
> + screen_info.blue_size,
> + screen_info.rsvd_pos,
> + screen_info.red_pos,
> + screen_info.green_pos,
> + screen_info.blue_pos);
> +
> + linearfb_fix.ypanstep = 0;
> + linearfb_fix.ywrapstep = 0;
> +
> + info->fbops = &linearfb_ops;
> + info->var = linearfb_defined;
> + info->fix = linearfb_fix;
> + info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
> +
> + if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
> + printk(KERN_ERR "linearfb: cannot allocate colormap\n");
> + goto err_unmap;
> + }
> + *p_info = info;
> + return 0;
> +
> +err_unmap:
> + iounmap(info->screen_base);
> +err_release_fb:
> + framebuffer_release(info);
> +err_release_mem:
> + if (request_succeeded)
> + release_mem_region(linearfb_fix.smem_start, size_total);
> + return err;
> +}
> +EXPORT_SYMBOL(linearfb_get_info);
> +
> +static int linearfb_probe(struct platform_device *dev)
> +{
> + int err;
> + struct fb_info *info;
> +
> + if ((err = linearfb_get_info(dev, &info)) < 0)
> + return err;
> +
> + if ((err = register_framebuffer(info)) < 0) {
> + printk(KERN_ERR "linearfb: cannot register framebuffer\n");
> + goto err_fb_dealloc;
> + }
> + printk(KERN_INFO "fb%d: %s frame buffer device\n",
> + info->node, info->fix.id);
> + return 0;
> +
> +err_fb_dealloc:
> + fb_dealloc_cmap(&info->cmap);
> + linearfb_destroy(info);
> + return err;
> +}
> +
> +static struct platform_driver linearfb_driver = {
> + .probe = linearfb_probe,
> + .driver = {
> + .name = "linearfb",
> + },
> +};
> +
> +static struct platform_device linearfb_device = {
> + .name = "linearfb",
> +};
> +
> +static int __init linearfb_init(void)
> +{
> + int ret;
> + char *option = NULL;
> +
> + if (screen_info.orig_video_isVGA != VIDEO_TYPE_LINEAR)
> + return -ENODEV;
> +
> + if (fb_get_options("linearfb", &option))
> + return -ENODEV;
> + linearfb_setup(option);
> +
> + if (!screen_info.lfb_linelength)
> + return -ENODEV;
> +
> + ret = platform_driver_register(&linearfb_driver);
> +
> + if (!ret) {
> + ret = platform_device_register(&linearfb_device);
> + if (ret)
> + platform_driver_unregister(&linearfb_driver);
> + }
> + return ret;
> +}
> +module_init(linearfb_init);
> +
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/fb.h b/include/linux/fb.h
> index 8e5a9df..0913385 100644
> --- a/include/linux/fb.h
> +++ b/include/linux/fb.h
> @@ -1137,6 +1137,14 @@ extern int fb_find_mode(struct fb_var_screeninfo *var,
> const struct fb_videomode *default_mode,
> unsigned int default_bpp);
>
> +#ifdef CONFIG_FB_LINEAR
> +struct platform_device;
> +
> +extern void linearfb_destroy(struct fb_info *info);
> +extern int linearfb_get_info(struct platform_device *dev,
> + struct fb_info **p_info);
> +#endif /* CONFIG_FB_LINEAR */
> +
> #endif /* __KERNEL__ */
>
> #endif /* _LINUX_FB_H */
> diff --git a/include/linux/screen_info.h b/include/linux/screen_info.h
> index 899fbb4..129f533 100644
> --- a/include/linux/screen_info.h
> +++ b/include/linux/screen_info.h
> @@ -66,6 +66,8 @@ struct screen_info {
>
> #define VIDEO_TYPE_EFI 0x70 /* EFI graphic mode */
>
> +#define VIDEO_TYPE_LINEAR 0x80 /* Simple linear frame bufffer */
> +
> #define VIDEO_FLAGS_NOCURSOR (1 << 0) /* The video mode has no cursor set */
>
> #ifdef __KERNEL__
--
Peter
I'd like to start a religion. That's where the money is.
-- L. Ron Hubbard to Lloyd Eshbach, in 1949;
quoted by Eshbach in _Over My Shoulder_.
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