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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 | ||
20c225cb JH |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
9e124435 KE |
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) { | |
20c225cb | 49 | pr_err("get contrast failed\n"); |
9e124435 KE |
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) { | |
20c225cb | 70 | pr_err("set contrast failed\n"); |
9e124435 KE |
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); | |
20c225cb | 108 | pr_err("failed to register device\n"); |
9e124435 KE |
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 | ||
81178e02 | 140 | module_platform_driver(jornada_lcd_driver); |
9e124435 KE |
141 | |
142 | MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); | |
143 | MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver"); | |
144 | MODULE_LICENSE("GPL"); |