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ec072b0f AZ |
1 | /* |
2 | * Backlight driver for OMAP based boards. | |
3 | * | |
4 | * Copyright (c) 2006 Andrzej Zaborowski <balrog@zabor.org> | |
5 | * | |
6 | * This package is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This package is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this package; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/fb.h> | |
26 | #include <linux/backlight.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
ec072b0f | 28 | |
a09e64fb | 29 | #include <mach/hardware.h> |
ce491cf8 TL |
30 | #include <plat/board.h> |
31 | #include <plat/mux.h> | |
ec072b0f AZ |
32 | |
33 | #define OMAPBL_MAX_INTENSITY 0xff | |
34 | ||
35 | struct omap_backlight { | |
36 | int powermode; | |
37 | int current_intensity; | |
38 | ||
39 | struct device *dev; | |
40 | struct omap_backlight_config *pdata; | |
41 | }; | |
42 | ||
43 | static void inline omapbl_send_intensity(int intensity) | |
44 | { | |
45 | omap_writeb(intensity, OMAP_PWL_ENABLE); | |
46 | } | |
47 | ||
48 | static void inline omapbl_send_enable(int enable) | |
49 | { | |
50 | omap_writeb(enable, OMAP_PWL_CLK_ENABLE); | |
51 | } | |
52 | ||
53 | static void omapbl_blank(struct omap_backlight *bl, int mode) | |
54 | { | |
55 | if (bl->pdata->set_power) | |
56 | bl->pdata->set_power(bl->dev, mode); | |
57 | ||
58 | switch (mode) { | |
59 | case FB_BLANK_NORMAL: | |
60 | case FB_BLANK_VSYNC_SUSPEND: | |
61 | case FB_BLANK_HSYNC_SUSPEND: | |
62 | case FB_BLANK_POWERDOWN: | |
63 | omapbl_send_intensity(0); | |
64 | omapbl_send_enable(0); | |
65 | break; | |
66 | ||
67 | case FB_BLANK_UNBLANK: | |
68 | omapbl_send_intensity(bl->current_intensity); | |
69 | omapbl_send_enable(1); | |
70 | break; | |
71 | } | |
72 | } | |
73 | ||
74 | #ifdef CONFIG_PM | |
75 | static int omapbl_suspend(struct platform_device *pdev, pm_message_t state) | |
76 | { | |
77 | struct backlight_device *dev = platform_get_drvdata(pdev); | |
78 | struct omap_backlight *bl = dev_get_drvdata(&dev->dev); | |
79 | ||
80 | omapbl_blank(bl, FB_BLANK_POWERDOWN); | |
81 | return 0; | |
82 | } | |
83 | ||
84 | static int omapbl_resume(struct platform_device *pdev) | |
85 | { | |
86 | struct backlight_device *dev = platform_get_drvdata(pdev); | |
87 | struct omap_backlight *bl = dev_get_drvdata(&dev->dev); | |
88 | ||
89 | omapbl_blank(bl, bl->powermode); | |
90 | return 0; | |
91 | } | |
92 | #else | |
93 | #define omapbl_suspend NULL | |
94 | #define omapbl_resume NULL | |
95 | #endif | |
96 | ||
97 | static int omapbl_set_power(struct backlight_device *dev, int state) | |
98 | { | |
99 | struct omap_backlight *bl = dev_get_drvdata(&dev->dev); | |
100 | ||
101 | omapbl_blank(bl, state); | |
102 | bl->powermode = state; | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static int omapbl_update_status(struct backlight_device *dev) | |
108 | { | |
109 | struct omap_backlight *bl = dev_get_drvdata(&dev->dev); | |
110 | ||
111 | if (bl->current_intensity != dev->props.brightness) { | |
112 | if (bl->powermode == FB_BLANK_UNBLANK) | |
113 | omapbl_send_intensity(dev->props.brightness); | |
114 | bl->current_intensity = dev->props.brightness; | |
115 | } | |
116 | ||
117 | if (dev->props.fb_blank != bl->powermode) | |
118 | omapbl_set_power(dev, dev->props.fb_blank); | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static int omapbl_get_intensity(struct backlight_device *dev) | |
124 | { | |
125 | struct omap_backlight *bl = dev_get_drvdata(&dev->dev); | |
126 | return bl->current_intensity; | |
127 | } | |
128 | ||
9905a43b | 129 | static const struct backlight_ops omapbl_ops = { |
ec072b0f AZ |
130 | .get_brightness = omapbl_get_intensity, |
131 | .update_status = omapbl_update_status, | |
132 | }; | |
133 | ||
134 | static int omapbl_probe(struct platform_device *pdev) | |
135 | { | |
a19a6ee6 | 136 | struct backlight_properties props; |
ec072b0f AZ |
137 | struct backlight_device *dev; |
138 | struct omap_backlight *bl; | |
139 | struct omap_backlight_config *pdata = pdev->dev.platform_data; | |
140 | ||
141 | if (!pdata) | |
142 | return -ENXIO; | |
143 | ||
ec072b0f AZ |
144 | bl = kzalloc(sizeof(struct omap_backlight), GFP_KERNEL); |
145 | if (unlikely(!bl)) | |
146 | return -ENOMEM; | |
147 | ||
a19a6ee6 MG |
148 | memset(&props, 0, sizeof(struct backlight_properties)); |
149 | props.max_brightness = OMAPBL_MAX_INTENSITY; | |
150 | dev = backlight_device_register("omap-bl", &pdev->dev, bl, &omapbl_ops, | |
151 | &props); | |
ec072b0f AZ |
152 | if (IS_ERR(dev)) { |
153 | kfree(bl); | |
154 | return PTR_ERR(dev); | |
155 | } | |
156 | ||
157 | bl->powermode = FB_BLANK_POWERDOWN; | |
158 | bl->current_intensity = 0; | |
159 | ||
160 | bl->pdata = pdata; | |
161 | bl->dev = &pdev->dev; | |
162 | ||
163 | platform_set_drvdata(pdev, dev); | |
164 | ||
165 | omap_cfg_reg(PWL); /* Conflicts with UART3 */ | |
166 | ||
167 | dev->props.fb_blank = FB_BLANK_UNBLANK; | |
ec072b0f AZ |
168 | dev->props.brightness = pdata->default_intensity; |
169 | omapbl_update_status(dev); | |
170 | ||
171 | printk(KERN_INFO "OMAP LCD backlight initialised\n"); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | static int omapbl_remove(struct platform_device *pdev) | |
177 | { | |
178 | struct backlight_device *dev = platform_get_drvdata(pdev); | |
179 | struct omap_backlight *bl = dev_get_drvdata(&dev->dev); | |
180 | ||
181 | backlight_device_unregister(dev); | |
182 | kfree(bl); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static struct platform_driver omapbl_driver = { | |
188 | .probe = omapbl_probe, | |
189 | .remove = omapbl_remove, | |
190 | .suspend = omapbl_suspend, | |
191 | .resume = omapbl_resume, | |
192 | .driver = { | |
193 | .name = "omap-bl", | |
194 | }, | |
195 | }; | |
196 | ||
197 | static int __init omapbl_init(void) | |
198 | { | |
199 | return platform_driver_register(&omapbl_driver); | |
200 | } | |
201 | ||
202 | static void __exit omapbl_exit(void) | |
203 | { | |
204 | platform_driver_unregister(&omapbl_driver); | |
205 | } | |
206 | ||
207 | module_init(omapbl_init); | |
208 | module_exit(omapbl_exit); | |
209 | ||
210 | MODULE_AUTHOR("Andrzej Zaborowski <balrog@zabor.org>"); | |
211 | MODULE_DESCRIPTION("OMAP LCD Backlight driver"); | |
212 | MODULE_LICENSE("GPL"); |