1// SPDX-License-Identifier: GPL-2.0-only
2/* drivers/video/backlight/platform_lcd.c
3 *
4 * Copyright 2008 Simtec Electronics
5 *	Ben Dooks <ben@simtec.co.uk>
6 *
7 * Generic platform-device LCD power control interface.
8*/
9
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/fb.h>
13#include <linux/backlight.h>
14#include <linux/lcd.h>
15#include <linux/slab.h>
16
17#include <video/platform_lcd.h>
18
19struct platform_lcd {
20	struct device		*us;
21	struct lcd_device	*lcd;
22	struct plat_lcd_data	*pdata;
23
24	unsigned int		 power;
25	unsigned int		 suspended:1;
26};
27
28static inline struct platform_lcd *to_our_lcd(struct lcd_device *lcd)
29{
30	return lcd_get_data(lcd);
31}
32
33static int platform_lcd_get_power(struct lcd_device *lcd)
34{
35	struct platform_lcd *plcd = to_our_lcd(lcd);
36
37	return plcd->power;
38}
39
40static int platform_lcd_set_power(struct lcd_device *lcd, int power)
41{
42	struct platform_lcd *plcd = to_our_lcd(lcd);
43	int lcd_power = 1;
44
45	if (power == FB_BLANK_POWERDOWN || plcd->suspended)
46		lcd_power = 0;
47
48	plcd->pdata->set_power(plcd->pdata, lcd_power);
49	plcd->power = power;
50
51	return 0;
52}
53
54static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info)
55{
56	struct platform_lcd *plcd = to_our_lcd(lcd);
57	struct plat_lcd_data *pdata = plcd->pdata;
58
59	if (pdata->match_fb)
60		return pdata->match_fb(pdata, info);
61
62	return plcd->us->parent == info->device;
63}
64
65static struct lcd_ops platform_lcd_ops = {
66	.get_power	= platform_lcd_get_power,
67	.set_power	= platform_lcd_set_power,
68	.check_fb	= platform_lcd_match,
69};
70
71static int platform_lcd_probe(struct platform_device *pdev)
72{
73	struct plat_lcd_data *pdata;
74	struct platform_lcd *plcd;
75	struct device *dev = &pdev->dev;
76	int err;
77
78	pdata = dev_get_platdata(&pdev->dev);
79	if (!pdata) {
80		dev_err(dev, "no platform data supplied\n");
81		return -EINVAL;
82	}
83
84	if (pdata->probe) {
85		err = pdata->probe(pdata);
86		if (err)
87			return err;
88	}
89
90	plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),
91			    GFP_KERNEL);
92	if (!plcd)
93		return -ENOMEM;
94
95	plcd->us = dev;
96	plcd->pdata = pdata;
97	plcd->lcd = devm_lcd_device_register(&pdev->dev, dev_name(dev), dev,
98						plcd, &platform_lcd_ops);
99	if (IS_ERR(plcd->lcd)) {
100		dev_err(dev, "cannot register lcd device\n");
101		return PTR_ERR(plcd->lcd);
102	}
103
104	platform_set_drvdata(pdev, plcd);
105	platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);
106
107	return 0;
108}
109
110#ifdef CONFIG_PM_SLEEP
111static int platform_lcd_suspend(struct device *dev)
112{
113	struct platform_lcd *plcd = dev_get_drvdata(dev);
114
115	plcd->suspended = 1;
116	platform_lcd_set_power(plcd->lcd, plcd->power);
117
118	return 0;
119}
120
121static int platform_lcd_resume(struct device *dev)
122{
123	struct platform_lcd *plcd = dev_get_drvdata(dev);
124
125	plcd->suspended = 0;
126	platform_lcd_set_power(plcd->lcd, plcd->power);
127
128	return 0;
129}
130#endif
131
132static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend,
133			platform_lcd_resume);
134
135static struct platform_driver platform_lcd_driver = {
136	.driver		= {
137		.name	= "platform-lcd",
138		.pm	= &platform_lcd_pm_ops,
139	},
140	.probe		= platform_lcd_probe,
141};
142
143module_platform_driver(platform_lcd_driver);
144
145MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
146MODULE_LICENSE("GPL v2");
147MODULE_ALIAS("platform:platform-lcd");
148