1 /*
2 * shmob_drm_backlight.c -- SH Mobile DRM Backlight
3 *
4 * Copyright (C) 2012 Renesas Electronics Corporation
5 *
6 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #include <linux/backlight.h>
15
16 #include "shmob_drm_backlight.h"
17 #include "shmob_drm_crtc.h"
18 #include "shmob_drm_drv.h"
19
shmob_drm_backlight_update(struct backlight_device * bdev)20 static int shmob_drm_backlight_update(struct backlight_device *bdev)
21 {
22 struct shmob_drm_connector *scon = bl_get_data(bdev);
23 struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
24 const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
25 int brightness = bdev->props.brightness;
26
27 if (bdev->props.power != FB_BLANK_UNBLANK ||
28 bdev->props.state & BL_CORE_SUSPENDED)
29 brightness = 0;
30
31 return bdata->set_brightness(brightness);
32 }
33
shmob_drm_backlight_get_brightness(struct backlight_device * bdev)34 static int shmob_drm_backlight_get_brightness(struct backlight_device *bdev)
35 {
36 struct shmob_drm_connector *scon = bl_get_data(bdev);
37 struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
38 const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
39
40 return bdata->get_brightness();
41 }
42
43 static const struct backlight_ops shmob_drm_backlight_ops = {
44 .options = BL_CORE_SUSPENDRESUME,
45 .update_status = shmob_drm_backlight_update,
46 .get_brightness = shmob_drm_backlight_get_brightness,
47 };
48
shmob_drm_backlight_dpms(struct shmob_drm_connector * scon,int mode)49 void shmob_drm_backlight_dpms(struct shmob_drm_connector *scon, int mode)
50 {
51 if (scon->backlight == NULL)
52 return;
53
54 scon->backlight->props.power = mode == DRM_MODE_DPMS_ON
55 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
56 backlight_update_status(scon->backlight);
57 }
58
shmob_drm_backlight_init(struct shmob_drm_connector * scon)59 int shmob_drm_backlight_init(struct shmob_drm_connector *scon)
60 {
61 struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
62 const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
63 struct drm_connector *connector = &scon->connector;
64 struct drm_device *dev = connector->dev;
65 struct backlight_device *backlight;
66
67 if (!bdata->max_brightness)
68 return 0;
69
70 backlight = backlight_device_register(bdata->name, dev->dev, scon,
71 &shmob_drm_backlight_ops, NULL);
72 if (IS_ERR(backlight)) {
73 dev_err(dev->dev, "unable to register backlight device: %ld\n",
74 PTR_ERR(backlight));
75 return PTR_ERR(backlight);
76 }
77
78 backlight->props.max_brightness = bdata->max_brightness;
79 backlight->props.brightness = bdata->max_brightness;
80 backlight->props.power = FB_BLANK_POWERDOWN;
81 backlight_update_status(backlight);
82
83 scon->backlight = backlight;
84 return 0;
85 }
86
shmob_drm_backlight_exit(struct shmob_drm_connector * scon)87 void shmob_drm_backlight_exit(struct shmob_drm_connector *scon)
88 {
89 backlight_device_unregister(scon->backlight);
90 }
91