diff options
Diffstat (limited to 'drivers/gpu/drm/shmobile/shmob_drm_backlight.c')
| -rw-r--r-- | drivers/gpu/drm/shmobile/shmob_drm_backlight.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/drivers/gpu/drm/shmobile/shmob_drm_backlight.c b/drivers/gpu/drm/shmobile/shmob_drm_backlight.c new file mode 100644 index 0000000..463aee1 --- /dev/null +++ b/drivers/gpu/drm/shmobile/shmob_drm_backlight.c @@ -0,0 +1,90 @@ +/* + * shmob_drm_backlight.c -- SH Mobile DRM Backlight + * + * Copyright (C) 2012 Renesas Corporation + * + * Laurent Pinchart (laurent.pinchart@ideasonboard.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/backlight.h> + +#include "shmob_drm_backlight.h" +#include "shmob_drm_crtc.h" +#include "shmob_drm_drv.h" + +static int shmob_drm_backlight_update(struct backlight_device *bdev) +{ + struct shmob_drm_connector *scon = bl_get_data(bdev); + struct shmob_drm_device *sdev = scon->connector.dev->dev_private; + const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight; + int brightness = bdev->props.brightness; + + if (bdev->props.power != FB_BLANK_UNBLANK || + bdev->props.state & BL_CORE_SUSPENDED) + brightness = 0; + + return bdata->set_brightness(brightness); +} + +static int shmob_drm_backlight_get_brightness(struct backlight_device *bdev) +{ + struct shmob_drm_connector *scon = bl_get_data(bdev); + struct shmob_drm_device *sdev = scon->connector.dev->dev_private; + const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight; + + return bdata->get_brightness(); +} + +static const struct backlight_ops shmob_drm_backlight_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = shmob_drm_backlight_update, + .get_brightness = shmob_drm_backlight_get_brightness, +}; + +void shmob_drm_backlight_dpms(struct shmob_drm_connector *scon, int mode) +{ + if (scon->backlight == NULL) + return; + + scon->backlight->props.power = mode == DRM_MODE_DPMS_ON + ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; + backlight_update_status(scon->backlight); +} + +int shmob_drm_backlight_init(struct shmob_drm_connector *scon) +{ + struct shmob_drm_device *sdev = scon->connector.dev->dev_private; + const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight; + struct drm_connector *connector = &scon->connector; + struct drm_device *dev = connector->dev; + struct backlight_device *backlight; + + if (!bdata->max_brightness) + return 0; + + backlight = backlight_device_register(bdata->name, dev->dev, scon, + &shmob_drm_backlight_ops, NULL); + if (IS_ERR(backlight)) { + dev_err(dev->dev, "unable to register backlight device: %ld\n", + PTR_ERR(backlight)); + return PTR_ERR(backlight); + } + + backlight->props.max_brightness = bdata->max_brightness; + backlight->props.brightness = bdata->max_brightness; + backlight->props.power = FB_BLANK_POWERDOWN; + backlight_update_status(backlight); + + scon->backlight = backlight; + return 0; +} + +void shmob_drm_backlight_exit(struct shmob_drm_connector *scon) +{ + backlight_device_unregister(scon->backlight); +} |