diff options
| -rw-r--r-- | drivers/gpu/drm/drm_fb_helper.c | 80 | ||||
| -rw-r--r-- | include/drm/drm_fb_helper.h | 4 |
2 files changed, 84 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 73f90f7e2f74..714c8af80180 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -654,6 +654,86 @@ out_free: } EXPORT_SYMBOL(drm_fb_helper_init); +/** + * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members + * @fb_helper: driver-allocated fbdev helper + * + * A helper to alloc fb_info and the members cmap and apertures. Called + * by the driver within the fb_probe fb_helper callback function. + * + * RETURNS: + * fb_info pointer if things went okay, pointer containing error code + * otherwise + */ +struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper) +{ + struct device *dev = fb_helper->dev->dev; + struct fb_info *info; + int ret; + + info = framebuffer_alloc(0, dev); + if (!info) + return ERR_PTR(-ENOMEM); + + ret = fb_alloc_cmap(&info->cmap, 256, 0); + if (ret) + goto err_release; + + info->apertures = alloc_apertures(1); + if (!info->apertures) { + ret = -ENOMEM; + goto err_free_cmap; + } + + fb_helper->fbdev = info; + + return info; + +err_free_cmap: + fb_dealloc_cmap(&info->cmap); +err_release: + framebuffer_release(info); + return ERR_PTR(ret); +} +EXPORT_SYMBOL(drm_fb_helper_alloc_fbi); + +/** + * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device + * @fb_helper: driver-allocated fbdev helper + * + * A wrapper around unregister_framebuffer, to release the fb_info + * framebuffer device + */ +void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper) +{ + if (fb_helper && fb_helper->fbdev) + unregister_framebuffer(fb_helper->fbdev); +} +EXPORT_SYMBOL(drm_fb_helper_unregister_fbi); + +/** + * drm_fb_helper_release_fbi - dealloc fb_info and its members + * @fb_helper: driver-allocated fbdev helper + * + * A helper to free memory taken by fb_info and the members cmap and + * apertures + */ +void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper) +{ + if (fb_helper) { + struct fb_info *info = fb_helper->fbdev; + + if (info) { + if (info->cmap.len) + fb_dealloc_cmap(&info->cmap); + framebuffer_release(info); + } + + fb_helper->fbdev = NULL; + } +} +EXPORT_SYMBOL(drm_fb_helper_release_fbi); + void drm_fb_helper_fini(struct drm_fb_helper *fb_helper) { if (!list_empty(&fb_helper->kernel_fb_list)) { diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h index 0dfd94def593..2ee4ec53efc1 100644 --- a/include/drm/drm_fb_helper.h +++ b/include/drm/drm_fb_helper.h @@ -136,6 +136,10 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var, struct fb_info *info); bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper); + +struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper); +void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper); +void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper); void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, uint32_t fb_width, uint32_t fb_height); void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, |