xref: /linux/drivers/video/backlight/jornada720_lcd.c (revision e0bf6c5ca2d3281f231c5f0c9bf145e9513644de)
1 /*
2  *
3  * LCD driver for HP Jornada 700 series (710/720/728)
4  * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License version
8  * 2 or any later version as published by the Free Software Foundation.
9  *
10  */
11 
12 #include <linux/device.h>
13 #include <linux/fb.h>
14 #include <linux/kernel.h>
15 #include <linux/lcd.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/delay.h>
19 
20 #include <mach/jornada720.h>
21 #include <mach/hardware.h>
22 
23 #include <video/s1d13xxxfb.h>
24 
25 #define LCD_MAX_CONTRAST	0xff
26 #define LCD_DEF_CONTRAST	0x80
27 
28 static int jornada_lcd_get_power(struct lcd_device *ld)
29 {
30 	return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
31 }
32 
33 static int jornada_lcd_get_contrast(struct lcd_device *ld)
34 {
35 	int ret;
36 
37 	if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
38 		return 0;
39 
40 	jornada_ssp_start();
41 
42 	if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
43 		ret = jornada_ssp_byte(TXDUMMY);
44 		goto success;
45 	}
46 
47 	dev_err(&ld->dev, "failed to set contrast\n");
48 	ret = -ETIMEDOUT;
49 
50 success:
51 	jornada_ssp_end();
52 	return ret;
53 }
54 
55 static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
56 {
57 	int ret = 0;
58 
59 	jornada_ssp_start();
60 
61 	/* start by sending our set contrast cmd to mcu */
62 	if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
63 		/* if successful push the new value */
64 		if (jornada_ssp_byte(value) == TXDUMMY)
65 			goto success;
66 	}
67 
68 	dev_err(&ld->dev, "failed to set contrast\n");
69 	ret = -ETIMEDOUT;
70 
71 success:
72 	jornada_ssp_end();
73 	return ret;
74 }
75 
76 static int jornada_lcd_set_power(struct lcd_device *ld, int power)
77 {
78 	if (power != FB_BLANK_UNBLANK) {
79 		PPSR &= ~PPC_LDD2;
80 		PPDR |= PPC_LDD2;
81 	} else {
82 		PPSR |= PPC_LDD2;
83 	}
84 
85 	return 0;
86 }
87 
88 static struct lcd_ops jornada_lcd_props = {
89 	.get_contrast = jornada_lcd_get_contrast,
90 	.set_contrast = jornada_lcd_set_contrast,
91 	.get_power = jornada_lcd_get_power,
92 	.set_power = jornada_lcd_set_power,
93 };
94 
95 static int jornada_lcd_probe(struct platform_device *pdev)
96 {
97 	struct lcd_device *lcd_device;
98 	int ret;
99 
100 	lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
101 					&pdev->dev, NULL, &jornada_lcd_props);
102 
103 	if (IS_ERR(lcd_device)) {
104 		ret = PTR_ERR(lcd_device);
105 		dev_err(&pdev->dev, "failed to register device\n");
106 		return ret;
107 	}
108 
109 	platform_set_drvdata(pdev, lcd_device);
110 
111 	/* lets set our default values */
112 	jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
113 	jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
114 	/* give it some time to startup */
115 	msleep(100);
116 
117 	return 0;
118 }
119 
120 static struct platform_driver jornada_lcd_driver = {
121 	.probe	= jornada_lcd_probe,
122 	.driver	= {
123 		.name	= "jornada_lcd",
124 	},
125 };
126 
127 module_platform_driver(jornada_lcd_driver);
128 
129 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
130 MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
131 MODULE_LICENSE("GPL");
132