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 	/* 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 *ld)
38 {
39 	int ret;
40 
41 	if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
42 		return 0;
43 
44 	jornada_ssp_start();
45 
46 	if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
47 		ret = jornada_ssp_byte(TXDUMMY);
48 		goto success;
49 	}
50 
51 	dev_err(&ld->dev, "failed to set contrast\n");
52 	ret = -ETIMEDOUT;
53 
54 success:
55 	jornada_ssp_end();
56 	return ret;
57 }
58 
59 static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
60 {
61 	int ret = 0;
62 
63 	jornada_ssp_start();
64 
65 	/* start by sending our set contrast cmd to mcu */
66 	if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
67 		/* if successful push the new value */
68 		if (jornada_ssp_byte(value) == TXDUMMY)
69 			goto success;
70 	}
71 
72 	dev_err(&ld->dev, "failed to set contrast\n");
73 	ret = -ETIMEDOUT;
74 
75 success:
76 	jornada_ssp_end();
77 	return ret;
78 }
79 
80 static int jornada_lcd_set_power(struct lcd_device *ld, int power)
81 {
82 	if (power != FB_BLANK_UNBLANK) {
83 		PPSR &= ~PPC_LDD2;
84 		PPDR |= PPC_LDD2;
85 	} else {
86 		PPSR |= PPC_LDD2;
87 	}
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 = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
105 					&pdev->dev, NULL, &jornada_lcd_props);
106 
107 	if (IS_ERR(lcd_device)) {
108 		ret = PTR_ERR(lcd_device);
109 		dev_err(&pdev->dev, "failed to register device\n");
110 		return ret;
111 	}
112 
113 	platform_set_drvdata(pdev, lcd_device);
114 
115 	/* lets set our default values */
116 	jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
117 	jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
118 	/* give it some time to startup */
119 	msleep(100);
120 
121 	return 0;
122 }
123 
124 static struct platform_driver jornada_lcd_driver = {
125 	.probe	= jornada_lcd_probe,
126 	.driver	= {
127 		.name	= "jornada_lcd",
128 	},
129 };
130 
131 module_platform_driver(jornada_lcd_driver);
132 
133 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
134 MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
135 MODULE_LICENSE("GPL");
136