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
shmob_drm_backlight_update(struct backlight_device * bdev)16 static 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 = backlight_get_brightness(bdev);
22
23 return bdata->set_brightness(brightness);
24 }
25
shmob_drm_backlight_get_brightness(struct backlight_device * bdev)26 static int shmob_drm_backlight_get_brightness(struct backlight_device *bdev)
27 {
28 struct shmob_drm_connector *scon = bl_get_data(bdev);
29 struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
30 const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
31
32 return bdata->get_brightness();
33 }
34
35 static const struct backlight_ops shmob_drm_backlight_ops = {
36 .options = BL_CORE_SUSPENDRESUME,
37 .update_status = shmob_drm_backlight_update,
38 .get_brightness = shmob_drm_backlight_get_brightness,
39 };
40
shmob_drm_backlight_dpms(struct shmob_drm_connector * scon,int mode)41 void shmob_drm_backlight_dpms(struct shmob_drm_connector *scon, int mode)
42 {
43 if (scon->backlight == NULL)
44 return;
45
46 scon->backlight->props.power = mode == DRM_MODE_DPMS_ON
47 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
48 backlight_update_status(scon->backlight);
49 }
50
shmob_drm_backlight_init(struct shmob_drm_connector * scon)51 int shmob_drm_backlight_init(struct shmob_drm_connector *scon)
52 {
53 struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
54 const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
55 struct drm_connector *connector = &scon->connector;
56 struct drm_device *dev = connector->dev;
57 struct backlight_device *backlight;
58
59 if (!bdata->max_brightness)
60 return 0;
61
62 backlight = backlight_device_register(bdata->name, dev->dev, scon,
63 &shmob_drm_backlight_ops, NULL);
64 if (IS_ERR(backlight)) {
65 dev_err(dev->dev, "unable to register backlight device: %ld\n",
66 PTR_ERR(backlight));
67 return PTR_ERR(backlight);
68 }
69
70 backlight->props.max_brightness = bdata->max_brightness;
71 backlight->props.brightness = bdata->max_brightness;
72 backlight->props.power = FB_BLANK_POWERDOWN;
73 backlight_update_status(backlight);
74
75 scon->backlight = backlight;
76 return 0;
77 }
78
shmob_drm_backlight_exit(struct shmob_drm_connector * scon)79 void shmob_drm_backlight_exit(struct shmob_drm_connector *scon)
80 {
81 backlight_device_unregister(scon->backlight);
82 }
83