1/* drivers/video/backlight/platform_lcd.c
2 *
3 * Copyright 2008 Simtec Electronics
4 *	Ben Dooks <ben@simtec.co.uk>
5 *
6 * Generic platform-device LCD power control interface.
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 version 2 as
10 * published by the Free Software Foundation.
11 *
12*/
13
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/fb.h>
17#include <linux/backlight.h>
18#include <linux/lcd.h>
19#include <linux/of.h>
20#include <linux/slab.h>
21
22#include <video/platform_lcd.h>
23
24struct platform_lcd {
25	struct device		*us;
26	struct lcd_device	*lcd;
27	struct plat_lcd_data	*pdata;
28
29	unsigned int		 power;
30	unsigned int		 suspended:1;
31};
32
33static inline struct platform_lcd *to_our_lcd(struct lcd_device *lcd)
34{
35	return lcd_get_data(lcd);
36}
37
38static int platform_lcd_get_power(struct lcd_device *lcd)
39{
40	struct platform_lcd *plcd = to_our_lcd(lcd);
41
42	return plcd->power;
43}
44
45static int platform_lcd_set_power(struct lcd_device *lcd, int power)
46{
47	struct platform_lcd *plcd = to_our_lcd(lcd);
48	int lcd_power = 1;
49
50	if (power == FB_BLANK_POWERDOWN || plcd->suspended)
51		lcd_power = 0;
52
53	plcd->pdata->set_power(plcd->pdata, lcd_power);
54	plcd->power = power;
55
56	return 0;
57}
58
59static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info)
60{
61	struct platform_lcd *plcd = to_our_lcd(lcd);
62	struct plat_lcd_data *pdata = plcd->pdata;
63
64	if (pdata->match_fb)
65		return pdata->match_fb(pdata, info);
66
67	return plcd->us->parent == info->device;
68}
69
70static struct lcd_ops platform_lcd_ops = {
71	.get_power	= platform_lcd_get_power,
72	.set_power	= platform_lcd_set_power,
73	.check_fb	= platform_lcd_match,
74};
75
76static int platform_lcd_probe(struct platform_device *pdev)
77{
78	struct plat_lcd_data *pdata;
79	struct platform_lcd *plcd;
80	struct device *dev = &pdev->dev;
81	int err;
82
83	pdata = dev_get_platdata(&pdev->dev);
84	if (!pdata) {
85		dev_err(dev, "no platform data supplied\n");
86		return -EINVAL;
87	}
88
89	if (pdata->probe) {
90		err = pdata->probe(pdata);
91		if (err)
92			return err;
93	}
94
95	plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),
96			    GFP_KERNEL);
97	if (!plcd)
98		return -ENOMEM;
99
100	plcd->us = dev;
101	plcd->pdata = pdata;
102	plcd->lcd = devm_lcd_device_register(&pdev->dev, dev_name(dev), dev,
103						plcd, &platform_lcd_ops);
104	if (IS_ERR(plcd->lcd)) {
105		dev_err(dev, "cannot register lcd device\n");
106		return PTR_ERR(plcd->lcd);
107	}
108
109	platform_set_drvdata(pdev, plcd);
110	platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);
111
112	return 0;
113}
114
115#ifdef CONFIG_PM_SLEEP
116static int platform_lcd_suspend(struct device *dev)
117{
118	struct platform_lcd *plcd = dev_get_drvdata(dev);
119
120	plcd->suspended = 1;
121	platform_lcd_set_power(plcd->lcd, plcd->power);
122
123	return 0;
124}
125
126static int platform_lcd_resume(struct device *dev)
127{
128	struct platform_lcd *plcd = dev_get_drvdata(dev);
129
130	plcd->suspended = 0;
131	platform_lcd_set_power(plcd->lcd, plcd->power);
132
133	return 0;
134}
135#endif
136
137static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend,
138			platform_lcd_resume);
139
140#ifdef CONFIG_OF
141static const struct of_device_id platform_lcd_of_match[] = {
142	{ .compatible = "platform-lcd" },
143	{},
144};
145MODULE_DEVICE_TABLE(of, platform_lcd_of_match);
146#endif
147
148static struct platform_driver platform_lcd_driver = {
149	.driver		= {
150		.name	= "platform-lcd",
151		.pm	= &platform_lcd_pm_ops,
152		.of_match_table = of_match_ptr(platform_lcd_of_match),
153	},
154	.probe		= platform_lcd_probe,
155};
156
157module_platform_driver(platform_lcd_driver);
158
159MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
160MODULE_LICENSE("GPL v2");
161MODULE_ALIAS("platform:platform-lcd");
162