1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * shmob_drm_backlight.c -- SH Mobile DRM Backlight
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2012 Renesas Electronics Corporation
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/backlight.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include "shmob_drm_backlight.h"
13*4882a593Smuzhiyun #include "shmob_drm_crtc.h"
14*4882a593Smuzhiyun #include "shmob_drm_drv.h"
15*4882a593Smuzhiyun
shmob_drm_backlight_update(struct backlight_device * bdev)16*4882a593Smuzhiyun static int shmob_drm_backlight_update(struct backlight_device *bdev)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun struct shmob_drm_connector *scon = bl_get_data(bdev);
19*4882a593Smuzhiyun struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
20*4882a593Smuzhiyun const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
21*4882a593Smuzhiyun int brightness = bdev->props.brightness;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun if (bdev->props.power != FB_BLANK_UNBLANK ||
24*4882a593Smuzhiyun bdev->props.state & BL_CORE_SUSPENDED)
25*4882a593Smuzhiyun brightness = 0;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun return bdata->set_brightness(brightness);
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
shmob_drm_backlight_get_brightness(struct backlight_device * bdev)30*4882a593Smuzhiyun static int shmob_drm_backlight_get_brightness(struct backlight_device *bdev)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun struct shmob_drm_connector *scon = bl_get_data(bdev);
33*4882a593Smuzhiyun struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
34*4882a593Smuzhiyun const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun return bdata->get_brightness();
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun static const struct backlight_ops shmob_drm_backlight_ops = {
40*4882a593Smuzhiyun .options = BL_CORE_SUSPENDRESUME,
41*4882a593Smuzhiyun .update_status = shmob_drm_backlight_update,
42*4882a593Smuzhiyun .get_brightness = shmob_drm_backlight_get_brightness,
43*4882a593Smuzhiyun };
44*4882a593Smuzhiyun
shmob_drm_backlight_dpms(struct shmob_drm_connector * scon,int mode)45*4882a593Smuzhiyun void shmob_drm_backlight_dpms(struct shmob_drm_connector *scon, int mode)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun if (scon->backlight == NULL)
48*4882a593Smuzhiyun return;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun scon->backlight->props.power = mode == DRM_MODE_DPMS_ON
51*4882a593Smuzhiyun ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
52*4882a593Smuzhiyun backlight_update_status(scon->backlight);
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
shmob_drm_backlight_init(struct shmob_drm_connector * scon)55*4882a593Smuzhiyun int shmob_drm_backlight_init(struct shmob_drm_connector *scon)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
58*4882a593Smuzhiyun const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
59*4882a593Smuzhiyun struct drm_connector *connector = &scon->connector;
60*4882a593Smuzhiyun struct drm_device *dev = connector->dev;
61*4882a593Smuzhiyun struct backlight_device *backlight;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun if (!bdata->max_brightness)
64*4882a593Smuzhiyun return 0;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun backlight = backlight_device_register(bdata->name, dev->dev, scon,
67*4882a593Smuzhiyun &shmob_drm_backlight_ops, NULL);
68*4882a593Smuzhiyun if (IS_ERR(backlight)) {
69*4882a593Smuzhiyun dev_err(dev->dev, "unable to register backlight device: %ld\n",
70*4882a593Smuzhiyun PTR_ERR(backlight));
71*4882a593Smuzhiyun return PTR_ERR(backlight);
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun backlight->props.max_brightness = bdata->max_brightness;
75*4882a593Smuzhiyun backlight->props.brightness = bdata->max_brightness;
76*4882a593Smuzhiyun backlight->props.power = FB_BLANK_POWERDOWN;
77*4882a593Smuzhiyun backlight_update_status(backlight);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun scon->backlight = backlight;
80*4882a593Smuzhiyun return 0;
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
shmob_drm_backlight_exit(struct shmob_drm_connector * scon)83*4882a593Smuzhiyun void shmob_drm_backlight_exit(struct shmob_drm_connector *scon)
84*4882a593Smuzhiyun {
85*4882a593Smuzhiyun backlight_device_unregister(scon->backlight);
86*4882a593Smuzhiyun }
87