Staging: udlfb: explicit dependencies and warnings
Specify Kconfig dependencies, and include warnings for building as a module udlfb is dependent on FB_DEFERRED_IO, FB_SYS_*, and FB_MODE_HELPERS Because many kernels do not include defio (which cannot be built as a module), yet users want to be able to build udlfb as a module later, udlfb has ifdefs and these dependency warnings to help udlfb build with or without certain dependencies, but also print warnings for any lost function. Even though this kind of flexibility isn't common, we've gotten feedback from a significant portion of users that they were frustrated without it. Signed-off-by: Bernie Thompson <bernie@plugable.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -1,8 +1,14 @@
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config FB_UDL
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config FB_UDL
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tristate "Displaylink USB Framebuffer support"
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tristate "Displaylink USB Framebuffer support"
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depends on FB && USB
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depends on FB && USB
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select FB_MODE_HELPERS
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select FB_SYS_FILLRECT
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select FB_SYS_COPYAREA
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select FB_SYS_IMAGEBLIT
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select FB_SYS_FOPS
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select FB_DEFERRED_IO
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---help---
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---help---
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This is an experimental driver for DisplayLink USB devices
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This is a kernel framebuffer driver for DisplayLink USB devices.
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that provides a framebuffer device. A normal framebuffer can
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Supports fbdev clients like xf86-video-fbdev, kdrive, fbi, and
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be used with this driver, or xorg can be run on the device
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mplayer -vo fbdev. Supports all USB 2.0 era DisplayLink devices.
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using it.
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To compile as a module, choose M here: the module name is udlfb.
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@ -56,6 +56,20 @@ static struct usb_device_id id_table[] = {
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};
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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MODULE_DEVICE_TABLE(usb, id_table);
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#ifndef CONFIG_FB_DEFERRED_IO
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#warning message "kernel FB_DEFFERRED_IO option to support generic fbdev apps"
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#endif
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#ifndef CONFIG_FB_SYS_IMAGEBLIT
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#ifndef CONFIG_FB_SYS_IMAGEBLIT_MODULE
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#warning message "FB_SYS_* in kernel or module option to support fb console"
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#endif
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#endif
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#ifndef CONFIG_FB_MODE_HELPERS
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#warning message "kernel FB_MODE_HELPERS required. Expect build break"
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#endif
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/* dlfb keeps a list of urbs for efficient bulk transfers */
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/* dlfb keeps a list of urbs for efficient bulk transfers */
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static void dlfb_urb_completion(struct urb *urb);
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static void dlfb_urb_completion(struct urb *urb);
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static struct urb *dlfb_get_urb(struct dlfb_data *dev);
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static struct urb *dlfb_get_urb(struct dlfb_data *dev);
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