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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/gpu/drm/gma500/backlight.c
2 * GMA500 Backlight Interface
4 * Copyright (c) 2009-2011, Intel Corporation.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
24 #include "psb_intel_reg.h"
25 #include "psb_intel_drv.h"
26 #include "intel_bios.h"
29 static void do_gma_backlight_set(struct drm_device
*dev
)
31 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
32 struct drm_psb_private
*dev_priv
= dev
->dev_private
;
33 backlight_update_status(dev_priv
->backlight_device
);
37 void gma_backlight_enable(struct drm_device
*dev
)
39 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
40 struct drm_psb_private
*dev_priv
= dev
->dev_private
;
41 dev_priv
->backlight_enabled
= true;
42 if (dev_priv
->backlight_device
) {
43 dev_priv
->backlight_device
->props
.brightness
= dev_priv
->backlight_level
;
44 do_gma_backlight_set(dev
);
49 void gma_backlight_disable(struct drm_device
*dev
)
51 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
52 struct drm_psb_private
*dev_priv
= dev
->dev_private
;
53 dev_priv
->backlight_enabled
= false;
54 if (dev_priv
->backlight_device
) {
55 dev_priv
->backlight_device
->props
.brightness
= 0;
56 do_gma_backlight_set(dev
);
61 void gma_backlight_set(struct drm_device
*dev
, int v
)
63 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
64 struct drm_psb_private
*dev_priv
= dev
->dev_private
;
65 dev_priv
->backlight_level
= v
;
66 if (dev_priv
->backlight_device
&& dev_priv
->backlight_enabled
) {
67 dev_priv
->backlight_device
->props
.brightness
= v
;
68 do_gma_backlight_set(dev
);
73 int gma_backlight_init(struct drm_device
*dev
)
75 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
76 struct drm_psb_private
*dev_priv
= dev
->dev_private
;
77 dev_priv
->backlight_enabled
= true;
78 return dev_priv
->ops
->backlight_init(dev
);
84 void gma_backlight_exit(struct drm_device
*dev
)
86 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
87 struct drm_psb_private
*dev_priv
= dev
->dev_private
;
88 if (dev_priv
->backlight_device
) {
89 dev_priv
->backlight_device
->props
.brightness
= 0;
90 backlight_update_status(dev_priv
->backlight_device
);
91 backlight_device_unregister(dev_priv
->backlight_device
);