1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *
4  * LCD driver for HP Jornada 700 series (710/720/728)
5  * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
6  */
7 
8 #include <linux/device.h>
9 #include <linux/fb.h>
10 #include <linux/kernel.h>
11 #include <linux/lcd.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/delay.h>
15 
16 #include <mach/jornada720.h>
17 #include <mach/hardware.h>
18 
19 #include <video/s1d13xxxfb.h>
20 
21 #define LCD_MAX_CONTRAST	0xff
22 #define LCD_DEF_CONTRAST	0x80
23 
24 static int jornada_lcd_get_power(struct lcd_device *ld)
25 {
26 	return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
27 }
28 
29 static int jornada_lcd_get_contrast(struct lcd_device *ld)
30 {
31 	int ret;
32 
33 	if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
34 		return 0;
35 
36 	jornada_ssp_start();
37 
38 	if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
39 		ret = jornada_ssp_byte(TXDUMMY);
40 		goto success;
41 	}
42 
43 	dev_err(&ld->dev, "failed to set contrast\n");
44 	ret = -ETIMEDOUT;
45 
46 success:
47 	jornada_ssp_end();
48 	return ret;
49 }
50 
51 static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
52 {
53 	int ret = 0;
54 
55 	jornada_ssp_start();
56 
57 	/* start by sending our set contrast cmd to mcu */
58 	if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
59 		/* if successful push the new value */
60 		if (jornada_ssp_byte(value) == TXDUMMY)
61 			goto success;
62 	}
63 
64 	dev_err(&ld->dev, "failed to set contrast\n");
65 	ret = -ETIMEDOUT;
66 
67 success:
68 	jornada_ssp_end();
69 	return ret;
70 }
71 
72 static int jornada_lcd_set_power(struct lcd_device *ld, int power)
73 {
74 	if (power != FB_BLANK_UNBLANK) {
75 		PPSR &= ~PPC_LDD2;
76 		PPDR |= PPC_LDD2;
77 	} else {
78 		PPSR |= PPC_LDD2;
79 	}
80 
81 	return 0;
82 }
83 
84 static struct lcd_ops jornada_lcd_props = {
85 	.get_contrast = jornada_lcd_get_contrast,
86 	.set_contrast = jornada_lcd_set_contrast,
87 	.get_power = jornada_lcd_get_power,
88 	.set_power = jornada_lcd_set_power,
89 };
90 
91 static int jornada_lcd_probe(struct platform_device *pdev)
92 {
93 	struct lcd_device *lcd_device;
94 	int ret;
95 
96 	lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
97 					&pdev->dev, NULL, &jornada_lcd_props);
98 
99 	if (IS_ERR(lcd_device)) {
100 		ret = PTR_ERR(lcd_device);
101 		dev_err(&pdev->dev, "failed to register device\n");
102 		return ret;
103 	}
104 
105 	platform_set_drvdata(pdev, lcd_device);
106 
107 	/* lets set our default values */
108 	jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
109 	jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
110 	/* give it some time to startup */
111 	msleep(100);
112 
113 	return 0;
114 }
115 
116 static struct platform_driver jornada_lcd_driver = {
117 	.probe	= jornada_lcd_probe,
118 	.driver	= {
119 		.name	= "jornada_lcd",
120 	},
121 };
122 
123 module_platform_driver(jornada_lcd_driver);
124 
125 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
126 MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
127 MODULE_LICENSE("GPL");
128