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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GMA500 Backlight Interface
4 *
5 * Copyright (c) 2009-2011, Intel Corporation.
6 *
7 * Authors: Eric Knopp
8 */
9
10#include <linux/backlight.h>
11
12#include <acpi/video.h>
13
14#include "psb_drv.h"
15#include "psb_intel_reg.h"
16#include "psb_intel_drv.h"
17#include "intel_bios.h"
18#include "power.h"
19
20void gma_backlight_enable(struct drm_device *dev)
21{
22 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
23
24 dev_priv->backlight_enabled = true;
25 dev_priv->ops->backlight_set(dev, dev_priv->backlight_level);
26}
27
28void gma_backlight_disable(struct drm_device *dev)
29{
30 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
31
32 dev_priv->backlight_enabled = false;
33 dev_priv->ops->backlight_set(dev, 0);
34}
35
36void gma_backlight_set(struct drm_device *dev, int v)
37{
38 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
39
40 dev_priv->backlight_level = v;
41 if (dev_priv->backlight_enabled)
42 dev_priv->ops->backlight_set(dev, v);
43}
44
45static int gma_backlight_get_brightness(struct backlight_device *bd)
46{
47 struct drm_device *dev = bl_get_data(bd);
48 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
49
50 if (dev_priv->ops->backlight_get)
51 return dev_priv->ops->backlight_get(dev);
52
53 return dev_priv->backlight_level;
54}
55
56static int gma_backlight_update_status(struct backlight_device *bd)
57{
58 struct drm_device *dev = bl_get_data(bd);
59 int level = backlight_get_brightness(bd);
60
61 /* Percentage 1-100% being valid */
62 if (level < 1)
63 level = 1;
64
65 gma_backlight_set(dev, level);
66 return 0;
67}
68
69static const struct backlight_ops gma_backlight_ops __maybe_unused = {
70 .get_brightness = gma_backlight_get_brightness,
71 .update_status = gma_backlight_update_status,
72};
73
74int gma_backlight_init(struct drm_device *dev)
75{
76 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
77 struct backlight_properties props __maybe_unused = {};
78 int ret;
79
80 dev_priv->backlight_enabled = true;
81 dev_priv->backlight_level = 100;
82
83 ret = dev_priv->ops->backlight_init(dev);
84 if (ret)
85 return ret;
86
87 if (!acpi_video_backlight_use_native()) {
88 drm_info(dev, "Skipping %s backlight registration\n",
89 dev_priv->ops->backlight_name);
90 return 0;
91 }
92
93#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
94 props.brightness = dev_priv->backlight_level;
95 props.max_brightness = PSB_MAX_BRIGHTNESS;
96 props.type = BACKLIGHT_RAW;
97
98 dev_priv->backlight_device =
99 backlight_device_register(dev_priv->ops->backlight_name,
100 dev->dev, dev,
101 &gma_backlight_ops, &props);
102 if (IS_ERR(dev_priv->backlight_device))
103 return PTR_ERR(dev_priv->backlight_device);
104#endif
105
106 return 0;
107}
108
109void gma_backlight_exit(struct drm_device *dev)
110{
111#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
112 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
113
114 if (dev_priv->backlight_device)
115 backlight_device_unregister(dev_priv->backlight_device);
116#endif
117}
1/*
2 * GMA500 Backlight Interface
3 *
4 * Copyright (c) 2009-2011, Intel Corporation.
5 *
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.
9 *
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
13 * more details.
14 *
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.
18 *
19 * Authors: Eric Knopp
20 *
21 */
22
23#include "psb_drv.h"
24#include "psb_intel_reg.h"
25#include "psb_intel_drv.h"
26#include "intel_bios.h"
27#include "power.h"
28
29#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
30static void do_gma_backlight_set(struct drm_device *dev)
31{
32 struct drm_psb_private *dev_priv = dev->dev_private;
33 backlight_update_status(dev_priv->backlight_device);
34}
35#endif
36
37void gma_backlight_enable(struct drm_device *dev)
38{
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);
45 }
46#endif
47}
48
49void gma_backlight_disable(struct drm_device *dev)
50{
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);
57 }
58#endif
59}
60
61void gma_backlight_set(struct drm_device *dev, int v)
62{
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);
69 }
70#endif
71}
72
73int gma_backlight_init(struct drm_device *dev)
74{
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);
79#else
80 return 0;
81#endif
82}
83
84void gma_backlight_exit(struct drm_device *dev)
85{
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);
92 }
93#endif
94}