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
28static int jornada_lcd_get_power(struct lcd_device *ld)
29{
30	return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
31}
32
33static 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
50success:
51	jornada_ssp_end();
52	return ret;
53}
54
55static 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
71success:
72	jornada_ssp_end();
73	return ret;
74}
75
76static 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
88static 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
95static 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
120static struct platform_driver jornada_lcd_driver = {
121	.probe	= jornada_lcd_probe,
122	.driver	= {
123		.name	= "jornada_lcd",
124	},
125};
126
127module_platform_driver(jornada_lcd_driver);
128
129MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
130MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
131MODULE_LICENSE("GPL");
132