LXR linux/drivers/staging/imx-drm/imx-fbdev.c

   1/*
   2 * i.MX drm driver
   3 *
   4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
   5 *
   6 * Based on Samsung Exynos code
   7 *
   8 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public License
  12 * as published by the Free Software Foundation; either version 2
  13 * of the License, or (at your option) any later version.
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 */
  20#include <linux/module.h>
  21#include <drm/drmP.h>
  22#include <drm/drm_crtc.h>
  23#include <drm/drm_crtc_helper.h>
  24#include <drm/drm_fb_cma_helper.h>
  25
  26#include "imx-drm.h"
  27
  28#define MAX_CONNECTOR           4
  29#define PREFERRED_BPP           16
  30
  31static struct drm_fbdev_cma *fbdev_cma;
  32
  33static int legacyfb_depth = 16;
  34
  35module_param(legacyfb_depth, int, 0444);
  36
  37static int __init imx_fb_helper_init(void)
  38{
  39        struct drm_device *drm = imx_drm_device_get();
  40
  41        if (!drm)
  42                return -EINVAL;
  43
  44        if (legacyfb_depth != 16 && legacyfb_depth != 32) {
  45                pr_warn("i.MX legacyfb: invalid legacyfb_depth setting. defaulting to 16bpp\n");
  46                legacyfb_depth = 16;
  47        }
  48
  49        fbdev_cma = drm_fbdev_cma_init(drm, legacyfb_depth,
  50                        drm->mode_config.num_crtc, MAX_CONNECTOR);
  51
  52        if (IS_ERR(fbdev_cma)) {
  53                imx_drm_device_put();
  54                return PTR_ERR(fbdev_cma);
  55        }
  56
  57        imx_drm_fb_helper_set(fbdev_cma);
  58
  59        return 0;
  60}
  61
  62static void __exit imx_fb_helper_exit(void)
  63{
  64        imx_drm_fb_helper_set(NULL);
  65        drm_fbdev_cma_fini(fbdev_cma);
  66        imx_drm_device_put();
  67}
  68
  69late_initcall(imx_fb_helper_init);
  70module_exit(imx_fb_helper_exit);
  71
  72MODULE_DESCRIPTION("Freescale i.MX legacy fb driver");
  73MODULE_AUTHOR("Sascha Hauer, Pengutronix");
  74MODULE_LICENSE("GPL");
  75