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 *dev)
29 {
30 	/* LDD2 in PPC = LCD POWER */
31 	if (PPSR & PPC_LDD2)
32 		return FB_BLANK_UNBLANK;	/* PW ON */
33 	else
34 		return FB_BLANK_POWERDOWN;	/* PW OFF */
35 }
36 
37 static int jornada_lcd_get_contrast(struct lcd_device *dev)
38 {
39 	int ret;
40 
41 	if (jornada_lcd_get_power(dev) != FB_BLANK_UNBLANK)
42 		return 0;
43 
44 	jornada_ssp_start();
45 
46 	if (jornada_ssp_byte(GETCONTRAST) != TXDUMMY) {
47 		printk(KERN_ERR "lcd: get contrast failed\n");
48 		jornada_ssp_end();
49 		return -ETIMEDOUT;
50 	} else {
51 		ret = jornada_ssp_byte(TXDUMMY);
52 		jornada_ssp_end();
53 		return ret;
54 	}
55 }
56 
57 static int jornada_lcd_set_contrast(struct lcd_device *dev, int value)
58 {
59 	int ret;
60 
61 	jornada_ssp_start();
62 
63 	/* start by sending our set contrast cmd to mcu */
64 	ret = jornada_ssp_byte(SETCONTRAST);
65 
66 	/* push the new value */
67 	if (jornada_ssp_byte(value) != TXDUMMY) {
68 		printk(KERN_ERR "lcd : set contrast failed\n");
69 		jornada_ssp_end();
70 		return -ETIMEDOUT;
71 	}
72 
73 	/* if we get here we can assume everything went well */
74 	jornada_ssp_end();
75 
76 	return 0;
77 }
78 
79 static int jornada_lcd_set_power(struct lcd_device *dev, int power)
80 {
81 	if (power != FB_BLANK_UNBLANK) {
82 		PPSR &= ~PPC_LDD2;
83 		PPDR |= PPC_LDD2;
84 	} else
85 		PPSR |= PPC_LDD2;
86 
87 	return 0;
88 }
89 
90 static struct lcd_ops jornada_lcd_props = {
91 	.get_contrast = jornada_lcd_get_contrast,
92 	.set_contrast = jornada_lcd_set_contrast,
93 	.get_power = jornada_lcd_get_power,
94 	.set_power = jornada_lcd_set_power,
95 };
96 
97 static int jornada_lcd_probe(struct platform_device *pdev)
98 {
99 	struct lcd_device *lcd_device;
100 	int ret;
101 
102 	lcd_device = lcd_device_register(S1D_DEVICENAME, &pdev->dev, NULL, &jornada_lcd_props);
103 
104 	if (IS_ERR(lcd_device)) {
105 		ret = PTR_ERR(lcd_device);
106 		printk(KERN_ERR "lcd : failed to register device\n");
107 		return ret;
108 	}
109 
110 	platform_set_drvdata(pdev, lcd_device);
111 
112 	/* lets set our default values */
113 	jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
114 	jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
115 	/* give it some time to startup */
116 	msleep(100);
117 
118 	return 0;
119 }
120 
121 static int jornada_lcd_remove(struct platform_device *pdev)
122 {
123 	struct lcd_device *lcd_device = platform_get_drvdata(pdev);
124 
125 	lcd_device_unregister(lcd_device);
126 
127 	return 0;
128 }
129 
130 static struct platform_driver jornada_lcd_driver = {
131 	.probe	= jornada_lcd_probe,
132 	.remove	= jornada_lcd_remove,
133 	.driver	= {
134 		.name	= "jornada_lcd",
135 	},
136 };
137 
138 int __init jornada_lcd_init(void)
139 {
140 	return platform_driver_register(&jornada_lcd_driver);
141 }
142 
143 void __exit jornada_lcd_exit(void)
144 {
145 	platform_driver_unregister(&jornada_lcd_driver);
146 }
147 
148 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
149 MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
150 MODULE_LICENSE("GPL");
151 
152 module_init(jornada_lcd_init);
153 module_exit(jornada_lcd_exit);
154