cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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shmob_drm_backlight.c (2577B)

      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}