forked from luck/tmp_suning_uos_patched
drm/fb_helper: Create wrappers for fb_sys_read/write funcs
Some drm drivers populate their fb_ops with fb_sys_read/write fb sysfs ops. Create a drm_fb_helper function that wraps around these calls. This is part of an effort to prevent drm drivers from calling fbdev functions directly, in order to make fbdev emulation a top level drm option. v3: - Fix kerneldoc errors v2: - Added kerneldocs - Follow the drm way of aligning of arguments in func definitions - Remove unnecessary checks for non NULL fb_info Signed-off-by: Archit Taneja <architt@codeaurora.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -37,6 +37,7 @@ config DRM_KMS_FB_HELPER
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select FB
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select FRAMEBUFFER_CONSOLE if !EXPERT
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select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
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select FB_SYS_FOPS
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help
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FBDEV helpers for KMS drivers.
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@ -761,6 +761,38 @@ void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
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}
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EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
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/**
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* drm_fb_helper_sys_read - wrapper around fb_sys_read
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* @info: fb_info struct pointer
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* @buf: userspace buffer to read from framebuffer memory
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* @count: number of bytes to read from framebuffer memory
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* @ppos: read offset within framebuffer memory
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*
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* A wrapper around fb_sys_read implemented by fbdev core
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*/
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ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
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size_t count, loff_t *ppos)
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{
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return fb_sys_read(info, buf, count, ppos);
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}
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EXPORT_SYMBOL(drm_fb_helper_sys_read);
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/**
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* drm_fb_helper_sys_write - wrapper around fb_sys_write
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* @info: fb_info struct pointer
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* @buf: userspace buffer to write to framebuffer memory
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* @count: number of bytes to write to framebuffer memory
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* @ppos: write offset within framebuffer memory
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*
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* A wrapper around fb_sys_write implemented by fbdev core
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*/
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ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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return fb_sys_write(info, buf, count, ppos);
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}
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EXPORT_SYMBOL(drm_fb_helper_sys_write);
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static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
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u16 blue, u16 regno, struct fb_info *info)
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{
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@ -147,6 +147,11 @@ void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
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void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
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ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
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size_t count, loff_t *ppos);
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ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
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size_t count, loff_t *ppos);
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int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
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int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
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