91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/*
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* shmob_drm_backlight.c -- SH Mobile DRM Backlight
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*
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* Copyright (C) 2012 Renesas Corporation
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*
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* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/backlight.h>
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#include "shmob_drm_backlight.h"
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#include "shmob_drm_crtc.h"
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#include "shmob_drm_drv.h"
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static int shmob_drm_backlight_update(struct backlight_device *bdev)
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{
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struct shmob_drm_connector *scon = bl_get_data(bdev);
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struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
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const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
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int brightness = bdev->props.brightness;
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if (bdev->props.power != FB_BLANK_UNBLANK ||
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bdev->props.state & BL_CORE_SUSPENDED)
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brightness = 0;
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return bdata->set_brightness(brightness);
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}
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static int shmob_drm_backlight_get_brightness(struct backlight_device *bdev)
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{
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struct shmob_drm_connector *scon = bl_get_data(bdev);
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struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
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const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
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return bdata->get_brightness();
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}
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static const struct backlight_ops shmob_drm_backlight_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = shmob_drm_backlight_update,
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.get_brightness = shmob_drm_backlight_get_brightness,
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};
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void shmob_drm_backlight_dpms(struct shmob_drm_connector *scon, int mode)
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{
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if (scon->backlight == NULL)
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return;
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scon->backlight->props.power = mode == DRM_MODE_DPMS_ON
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? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
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backlight_update_status(scon->backlight);
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}
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int shmob_drm_backlight_init(struct shmob_drm_connector *scon)
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{
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struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
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const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
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struct drm_connector *connector = &scon->connector;
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struct drm_device *dev = connector->dev;
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struct backlight_device *backlight;
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if (!bdata->max_brightness)
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return 0;
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backlight = backlight_device_register(bdata->name, dev->dev, scon,
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&shmob_drm_backlight_ops, NULL);
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if (IS_ERR(backlight)) {
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dev_err(dev->dev, "unable to register backlight device: %ld\n",
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PTR_ERR(backlight));
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return PTR_ERR(backlight);
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}
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backlight->props.max_brightness = bdata->max_brightness;
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backlight->props.brightness = bdata->max_brightness;
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backlight->props.power = FB_BLANK_POWERDOWN;
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backlight_update_status(backlight);
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scon->backlight = backlight;
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return 0;
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}
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void shmob_drm_backlight_exit(struct shmob_drm_connector *scon)
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{
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backlight_device_unregister(scon->backlight);
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}
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