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9e124435 KE |
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 | ||
81178e02 | 138 | module_platform_driver(jornada_lcd_driver); |
9e124435 KE |
139 | |
140 | MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); | |
141 | MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver"); | |
142 | MODULE_LICENSE("GPL"); |