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13a7b5dc KE |
1 | /* |
2 | * | |
3 | * Backlight 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/backlight.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/fb.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/platform_device.h> | |
18 | ||
19 | #include <mach/jornada720.h> | |
20 | #include <mach/hardware.h> | |
21 | ||
22 | #include <video/s1d13xxxfb.h> | |
23 | ||
24 | #define BL_MAX_BRIGHT 255 | |
25 | #define BL_DEF_BRIGHT 25 | |
26 | ||
27 | static int jornada_bl_get_brightness(struct backlight_device *bd) | |
28 | { | |
29 | int ret; | |
30 | ||
31 | /* check if backlight is on */ | |
32 | if (!(PPSR & PPC_LDD1)) | |
33 | return 0; | |
34 | ||
35 | jornada_ssp_start(); | |
36 | ||
37 | /* cmd should return txdummy */ | |
38 | ret = jornada_ssp_byte(GETBRIGHTNESS); | |
39 | ||
40 | if (jornada_ssp_byte(GETBRIGHTNESS) != TXDUMMY) { | |
b2dcd7be | 41 | dev_err(&bd->dev, "get brightness timeout\n"); |
13a7b5dc KE |
42 | jornada_ssp_end(); |
43 | return -ETIMEDOUT; | |
b2dcd7be JH |
44 | } else { |
45 | /* exchange txdummy for value */ | |
13a7b5dc | 46 | ret = jornada_ssp_byte(TXDUMMY); |
b2dcd7be | 47 | } |
13a7b5dc KE |
48 | |
49 | jornada_ssp_end(); | |
50 | ||
0a75a568 | 51 | return BL_MAX_BRIGHT - ret; |
13a7b5dc KE |
52 | } |
53 | ||
54 | static int jornada_bl_update_status(struct backlight_device *bd) | |
55 | { | |
56 | int ret = 0; | |
57 | ||
58 | jornada_ssp_start(); | |
59 | ||
60 | /* If backlight is off then really turn it off */ | |
61 | if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) { | |
62 | ret = jornada_ssp_byte(BRIGHTNESSOFF); | |
63 | if (ret != TXDUMMY) { | |
b2dcd7be | 64 | dev_info(&bd->dev, "brightness off timeout\n"); |
13a7b5dc KE |
65 | /* turn off backlight */ |
66 | PPSR &= ~PPC_LDD1; | |
67 | PPDR |= PPC_LDD1; | |
68 | ret = -ETIMEDOUT; | |
69 | } | |
70 | } else /* turn on backlight */ | |
71 | PPSR |= PPC_LDD1; | |
72 | ||
73 | /* send command to our mcu */ | |
74 | if (jornada_ssp_byte(SETBRIGHTNESS) != TXDUMMY) { | |
b2dcd7be | 75 | dev_info(&bd->dev, "failed to set brightness\n"); |
13a7b5dc | 76 | ret = -ETIMEDOUT; |
b317c833 | 77 | goto out; |
13a7b5dc KE |
78 | } |
79 | ||
0a75a568 JH |
80 | /* |
81 | * at this point we expect that the mcu has accepted | |
82 | * our command and is waiting for our new value | |
83 | * please note that maximum brightness is 255, | |
84 | * but due to physical layout it is equal to 0, so we simply | |
85 | * invert the value (MAX VALUE - NEW VALUE). | |
86 | */ | |
87 | if (jornada_ssp_byte(BL_MAX_BRIGHT - bd->props.brightness) | |
88 | != TXDUMMY) { | |
b2dcd7be | 89 | dev_err(&bd->dev, "set brightness failed\n"); |
13a7b5dc KE |
90 | ret = -ETIMEDOUT; |
91 | } | |
92 | ||
0a75a568 JH |
93 | /* |
94 | * If infact we get an TXDUMMY as output we are happy and dont | |
95 | * make any further comments about it | |
96 | */ | |
13a7b5dc KE |
97 | out: |
98 | jornada_ssp_end(); | |
99 | ||
100 | return ret; | |
101 | } | |
102 | ||
9905a43b | 103 | static const struct backlight_ops jornada_bl_ops = { |
13a7b5dc KE |
104 | .get_brightness = jornada_bl_get_brightness, |
105 | .update_status = jornada_bl_update_status, | |
106 | .options = BL_CORE_SUSPENDRESUME, | |
107 | }; | |
108 | ||
109 | static int jornada_bl_probe(struct platform_device *pdev) | |
110 | { | |
a19a6ee6 | 111 | struct backlight_properties props; |
13a7b5dc KE |
112 | int ret; |
113 | struct backlight_device *bd; | |
114 | ||
a19a6ee6 | 115 | memset(&props, 0, sizeof(struct backlight_properties)); |
bb7ca747 | 116 | props.type = BACKLIGHT_RAW; |
a19a6ee6 | 117 | props.max_brightness = BL_MAX_BRIGHT; |
13a7b5dc | 118 | |
0ec585d3 JH |
119 | bd = devm_backlight_device_register(&pdev->dev, S1D_DEVICENAME, |
120 | &pdev->dev, NULL, &jornada_bl_ops, | |
121 | &props); | |
13a7b5dc KE |
122 | if (IS_ERR(bd)) { |
123 | ret = PTR_ERR(bd); | |
b2dcd7be | 124 | dev_err(&pdev->dev, "failed to register device, err=%x\n", ret); |
13a7b5dc KE |
125 | return ret; |
126 | } | |
127 | ||
128 | bd->props.power = FB_BLANK_UNBLANK; | |
129 | bd->props.brightness = BL_DEF_BRIGHT; | |
0a75a568 JH |
130 | /* |
131 | * note. make sure max brightness is set otherwise | |
132 | * you will get seemingly non-related errors when | |
133 | * trying to change brightness | |
134 | */ | |
13a7b5dc KE |
135 | jornada_bl_update_status(bd); |
136 | ||
137 | platform_set_drvdata(pdev, bd); | |
b2dcd7be | 138 | dev_info(&pdev->dev, "HP Jornada 700 series backlight driver\n"); |
13a7b5dc KE |
139 | |
140 | return 0; | |
141 | } | |
142 | ||
13a7b5dc KE |
143 | static struct platform_driver jornada_bl_driver = { |
144 | .probe = jornada_bl_probe, | |
13a7b5dc KE |
145 | .driver = { |
146 | .name = "jornada_bl", | |
147 | }, | |
148 | }; | |
149 | ||
81178e02 | 150 | module_platform_driver(jornada_bl_driver); |
13a7b5dc KE |
151 | |
152 | MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson>"); | |
153 | MODULE_DESCRIPTION("HP Jornada 710/720/728 Backlight driver"); | |
154 | MODULE_LICENSE("GPL"); |