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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 
14 #include <linux/device.h>
15 #include <linux/fb.h>
16 #include <linux/kernel.h>
17 #include <linux/lcd.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/delay.h>
21 
22 #include <mach/jornada720.h>
23 #include <mach/hardware.h>
24 
25 #include <video/s1d13xxxfb.h>
26 
27 #define LCD_MAX_CONTRAST	0xff
28 #define LCD_DEF_CONTRAST	0x80
29 
30 static int jornada_lcd_get_power(struct lcd_device *dev)
31 {
32 	/* LDD2 in PPC = LCD POWER */
33 	if (PPSR & PPC_LDD2)
34 		return FB_BLANK_UNBLANK;	/* PW ON */
35 	else
36 		return FB_BLANK_POWERDOWN;	/* PW OFF */
37 }
38 
39 static int jornada_lcd_get_contrast(struct lcd_device *dev)
40 {
41 	int ret;
42 
43 	if (jornada_lcd_get_power(dev) != FB_BLANK_UNBLANK)
44 		return 0;
45 
46 	jornada_ssp_start();
47 
48 	if (jornada_ssp_byte(GETCONTRAST) != TXDUMMY) {
49 		pr_err("get contrast failed\n");
50 		jornada_ssp_end();
51 		return -ETIMEDOUT;
52 	} else {
53 		ret = jornada_ssp_byte(TXDUMMY);
54 		jornada_ssp_end();
55 		return ret;
56 	}
57 }
58 
59 static int jornada_lcd_set_contrast(struct lcd_device *dev, int value)
60 {
61 	int ret;
62 
63 	jornada_ssp_start();
64 
65 	/* start by sending our set contrast cmd to mcu */
66 	ret = jornada_ssp_byte(SETCONTRAST);
67 
68 	/* push the new value */
69 	if (jornada_ssp_byte(value) != TXDUMMY) {
70 		pr_err("set contrast failed\n");
71 		jornada_ssp_end();
72 		return -ETIMEDOUT;
73 	}
74 
75 	/* if we get here we can assume everything went well */
76 	jornada_ssp_end();
77 
78 	return 0;
79 }
80 
81 static int jornada_lcd_set_power(struct lcd_device *dev, int power)
82 {
83 	if (power != FB_BLANK_UNBLANK) {
84 		PPSR &= ~PPC_LDD2;
85 		PPDR |= PPC_LDD2;
86 	} else
87 		PPSR |= PPC_LDD2;
88 
89 	return 0;
90 }
91 
92 static struct lcd_ops jornada_lcd_props = {
93 	.get_contrast = jornada_lcd_get_contrast,
94 	.set_contrast = jornada_lcd_set_contrast,
95 	.get_power = jornada_lcd_get_power,
96 	.set_power = jornada_lcd_set_power,
97 };
98 
99 static int jornada_lcd_probe(struct platform_device *pdev)
100 {
101 	struct lcd_device *lcd_device;
102 	int ret;
103 
104 	lcd_device = lcd_device_register(S1D_DEVICENAME, &pdev->dev, NULL, &jornada_lcd_props);
105 
106 	if (IS_ERR(lcd_device)) {
107 		ret = PTR_ERR(lcd_device);
108 		pr_err("failed to register device\n");
109 		return ret;
110 	}
111 
112 	platform_set_drvdata(pdev, lcd_device);
113 
114 	/* lets set our default values */
115 	jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
116 	jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
117 	/* give it some time to startup */
118 	msleep(100);
119 
120 	return 0;
121 }
122 
123 static int jornada_lcd_remove(struct platform_device *pdev)
124 {
125 	struct lcd_device *lcd_device = platform_get_drvdata(pdev);
126 
127 	lcd_device_unregister(lcd_device);
128 
129 	return 0;
130 }
131 
132 static struct platform_driver jornada_lcd_driver = {
133 	.probe	= jornada_lcd_probe,
134 	.remove	= jornada_lcd_remove,
135 	.driver	= {
136 		.name	= "jornada_lcd",
137 	},
138 };
139 
140 module_platform_driver(jornada_lcd_driver);
141 
142 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
143 MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
144 MODULE_LICENSE("GPL");
145