From 0db5b61e0dc07cee121e5a04932ca7f5d0b62f6a Mon Sep 17 00:00:00 2001 From: Thomas Zimmermann Date: Mon, 18 Jul 2022 09:23:13 +0200 Subject: [PATCH] fbdev/vga16fb: Create EGA/VGA devices in sysfb code Move the device-creation from vga16fb to sysfb code. The driver's videomode checks are independent from device creation, so move them into vga16fb's probe function. This will allow to create the module init/exit code automatically. The vga16fb driver requires a screen_info for type VIDEO_TYPE_VGAC or VIDEO_TYPE_EGAC. Such code is nowhere present in the kernel, except for some MIPS systems. It's not clear if the vga16fb driver actually works in practice. v2: * keep driver name to "vga16fb" (Javier) * give rational for moving mode checks (Javier) Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Link: https://patchwork.freedesktop.org/patch/msgid/20220718072322.8927-3-tzimmermann@suse.de --- drivers/firmware/sysfb.c | 4 +++ drivers/video/fbdev/vga16fb.c | 57 ++++++++++++++++++++----------------------- 2 files changed, 31 insertions(+), 30 deletions(-) diff --git a/drivers/firmware/sysfb.c b/drivers/firmware/sysfb.c index 1f276f1..3fd3563 100644 --- a/drivers/firmware/sysfb.c +++ b/drivers/firmware/sysfb.c @@ -94,6 +94,10 @@ static __init int sysfb_init(void) name = "efi-framebuffer"; else if (si->orig_video_isVGA == VIDEO_TYPE_VLFB) name = "vesa-framebuffer"; + else if (si->orig_video_isVGA == VIDEO_TYPE_VGAC) + name = "vga-framebuffer"; + else if (si->orig_video_isVGA == VIDEO_TYPE_EGAC) + name = "ega-framebuffer"; else name = "platform-framebuffer"; diff --git a/drivers/video/fbdev/vga16fb.c b/drivers/video/fbdev/vga16fb.c index faf7697..9e614c1 100644 --- a/drivers/video/fbdev/vga16fb.c +++ b/drivers/video/fbdev/vga16fb.c @@ -185,19 +185,19 @@ static inline void setindex(int index) } /* Check if the video mode is supported by the driver */ -static inline int check_mode_supported(void) +static inline int check_mode_supported(const struct screen_info *si) { /* non-x86 architectures treat orig_video_isVGA as a boolean flag */ #if defined(CONFIG_X86) /* only EGA and VGA in 16 color graphic mode are supported */ - if (screen_info.orig_video_isVGA != VIDEO_TYPE_EGAC && - screen_info.orig_video_isVGA != VIDEO_TYPE_VGAC) + if (si->orig_video_isVGA != VIDEO_TYPE_EGAC && + si->orig_video_isVGA != VIDEO_TYPE_VGAC) return -ENODEV; - if (screen_info.orig_video_mode != 0x0D && /* 320x200/4 (EGA) */ - screen_info.orig_video_mode != 0x0E && /* 640x200/4 (EGA) */ - screen_info.orig_video_mode != 0x10 && /* 640x350/4 (EGA) */ - screen_info.orig_video_mode != 0x12) /* 640x480/4 (VGA) */ + if (si->orig_video_mode != 0x0D && /* 320x200/4 (EGA) */ + si->orig_video_mode != 0x0E && /* 640x200/4 (EGA) */ + si->orig_video_mode != 0x10 && /* 640x350/4 (EGA) */ + si->orig_video_mode != 0x12) /* 640x480/4 (VGA) */ return -ENODEV; #endif return 0; @@ -1321,11 +1321,20 @@ static int __init vga16fb_setup(char *options) static int vga16fb_probe(struct platform_device *dev) { + struct screen_info *si; struct fb_info *info; struct vga16fb_par *par; int i; int ret = 0; + si = dev_get_platdata(&dev->dev); + if (!si) + return -ENODEV; + + ret = check_mode_supported(si); + if (ret) + return ret; + printk(KERN_DEBUG "vga16fb: initializing\n"); info = framebuffer_alloc(sizeof(struct vga16fb_par), &dev->dev); @@ -1352,10 +1361,10 @@ static int vga16fb_probe(struct platform_device *dev) par = info->par; #if defined(CONFIG_X86) - par->isVGA = screen_info.orig_video_isVGA == VIDEO_TYPE_VGAC; + par->isVGA = si->orig_video_isVGA == VIDEO_TYPE_VGAC; #else /* non-x86 architectures treat orig_video_isVGA as a boolean flag */ - par->isVGA = screen_info.orig_video_isVGA; + par->isVGA = si->orig_video_isVGA; #endif par->palette_blanked = 0; par->vesa_blanked = 0; @@ -1425,16 +1434,21 @@ static int vga16fb_remove(struct platform_device *dev) return 0; } +static const struct platform_device_id vga16fb_driver_id_table[] = { + {"ega-framebuffer", 0}, + {"vga-framebuffer", 0}, + { } +}; + static struct platform_driver vga16fb_driver = { .probe = vga16fb_probe, .remove = vga16fb_remove, .driver = { .name = "vga16fb", }, + .id_table = vga16fb_driver_id_table, }; -static struct platform_device *vga16fb_device; - static int __init vga16fb_init(void) { int ret; @@ -1447,32 +1461,15 @@ static int __init vga16fb_init(void) vga16fb_setup(option); #endif - ret = check_mode_supported(); + ret = platform_driver_register(&vga16fb_driver); if (ret) return ret; - ret = platform_driver_register(&vga16fb_driver); - - if (!ret) { - vga16fb_device = platform_device_alloc("vga16fb", 0); - - if (vga16fb_device) - ret = platform_device_add(vga16fb_device); - else - ret = -ENOMEM; - - if (ret) { - platform_device_put(vga16fb_device); - platform_driver_unregister(&vga16fb_driver); - } - } - - return ret; + return 0; } static void __exit vga16fb_exit(void) { - platform_device_unregister(vga16fb_device); platform_driver_unregister(&vga16fb_driver); } -- 2.7.4