LXR linux/drivers/gpu/drm/shmobile/shmob_drm

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * shmob_drm_backlight.c  --  SH Mobile DRM Backlight
   4 *
   5 * Copyright (C) 2012 Renesas Electronics Corporation
   6 *
   7 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   8 */
   9
  10#include <linux/backlight.h>
  11
  12#include "shmob_drm_backlight.h"
  13#include "shmob_drm_crtc.h"
  14#include "shmob_drm_drv.h"
  15
  16static int shmob_drm_backlight_update(struct backlight_device *bdev)
  17{
  18        struct shmob_drm_connector *scon = bl_get_data(bdev);
  19        struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
  20        const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
  21        int brightness = bdev->props.brightness;
  22
  23        if (bdev->props.power != FB_BLANK_UNBLANK ||
  24            bdev->props.state & BL_CORE_SUSPENDED)
  25                brightness = 0;
  26
  27        return bdata->set_brightness(brightness);
  28}
  29
  30static int shmob_drm_backlight_get_brightness(struct backlight_device *bdev)
  31{
  32        struct shmob_drm_connector *scon = bl_get_data(bdev);
  33        struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
  34        const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
  35
  36        return bdata->get_brightness();
  37}
  38
  39static const struct backlight_ops shmob_drm_backlight_ops = {
  40        .options        = BL_CORE_SUSPENDRESUME,
  41        .update_status  = shmob_drm_backlight_update,
  42        .get_brightness = shmob_drm_backlight_get_brightness,
  43};
  44
  45void shmob_drm_backlight_dpms(struct shmob_drm_connector *scon, int mode)
  46{
  47        if (scon->backlight == NULL)
  48                return;
  49
  50        scon->backlight->props.power = mode == DRM_MODE_DPMS_ON
  51                                     ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  52        backlight_update_status(scon->backlight);
  53}
  54
  55int shmob_drm_backlight_init(struct shmob_drm_connector *scon)
  56{
  57        struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
  58        const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
  59        struct drm_connector *connector = &scon->connector;
  60        struct drm_device *dev = connector->dev;
  61        struct backlight_device *backlight;
  62
  63        if (!bdata->max_brightness)
  64                return 0;
  65
  66        backlight = backlight_device_register(bdata->name, dev->dev, scon,
  67                                              &shmob_drm_backlight_ops, NULL);
  68        if (IS_ERR(backlight)) {
  69                dev_err(dev->dev, "unable to register backlight device: %ld\n",
  70                        PTR_ERR(backlight));
  71                return PTR_ERR(backlight);
  72        }
  73
  74        backlight->props.max_brightness = bdata->max_brightness;
  75        backlight->props.brightness = bdata->max_brightness;
  76        backlight->props.power = FB_BLANK_POWERDOWN;
  77        backlight_update_status(backlight);
  78
  79        scon->backlight = backlight;
  80        return 0;
  81}
  82
  83void shmob_drm_backlight_exit(struct shmob_drm_connector *scon)
  84{
  85        backlight_device_unregister(scon->backlight);
  86}
  87