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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 | ||
95e93132 JH |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
ec072b0f AZ |
23 | #include <linux/module.h> |
24 | #include <linux/kernel.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/fb.h> | |
28 | #include <linux/backlight.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
ec072b0f | 30 | |
a09e64fb | 31 | #include <mach/hardware.h> |
ce491cf8 TL |
32 | #include <plat/board.h> |
33 | #include <plat/mux.h> | |
ec072b0f AZ |
34 | |
35 | #define OMAPBL_MAX_INTENSITY 0xff | |
36 | ||
37 | struct omap_backlight { | |
38 | int powermode; | |
39 | int current_intensity; | |
40 | ||
41 | struct device *dev; | |
42 | struct omap_backlight_config *pdata; | |
43 | }; | |
44 | ||
45 | static void inline omapbl_send_intensity(int intensity) | |
46 | { | |
47 | omap_writeb(intensity, OMAP_PWL_ENABLE); | |
48 | } | |
49 | ||
50 | static void inline omapbl_send_enable(int enable) | |
51 | { | |
52 | omap_writeb(enable, OMAP_PWL_CLK_ENABLE); | |
53 | } | |
54 | ||
55 | static void omapbl_blank(struct omap_backlight *bl, int mode) | |
56 | { | |
57 | if (bl->pdata->set_power) | |
58 | bl->pdata->set_power(bl->dev, mode); | |
59 | ||
60 | switch (mode) { | |
61 | case FB_BLANK_NORMAL: | |
62 | case FB_BLANK_VSYNC_SUSPEND: | |
63 | case FB_BLANK_HSYNC_SUSPEND: | |
64 | case FB_BLANK_POWERDOWN: | |
65 | omapbl_send_intensity(0); | |
66 | omapbl_send_enable(0); | |
67 | break; | |
68 | ||
69 | case FB_BLANK_UNBLANK: | |
70 | omapbl_send_intensity(bl->current_intensity); | |
71 | omapbl_send_enable(1); | |
72 | break; | |
73 | } | |
74 | } | |
75 | ||
76 | #ifdef CONFIG_PM | |
77 | static int omapbl_suspend(struct platform_device *pdev, pm_message_t state) | |
78 | { | |
79 | struct backlight_device *dev = platform_get_drvdata(pdev); | |
80 | struct omap_backlight *bl = dev_get_drvdata(&dev->dev); | |
81 | ||
82 | omapbl_blank(bl, FB_BLANK_POWERDOWN); | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static int omapbl_resume(struct platform_device *pdev) | |
87 | { | |
88 | struct backlight_device *dev = platform_get_drvdata(pdev); | |
89 | struct omap_backlight *bl = dev_get_drvdata(&dev->dev); | |
90 | ||
91 | omapbl_blank(bl, bl->powermode); | |
92 | return 0; | |
93 | } | |
94 | #else | |
95 | #define omapbl_suspend NULL | |
96 | #define omapbl_resume NULL | |
97 | #endif | |
98 | ||
99 | static int omapbl_set_power(struct backlight_device *dev, int state) | |
100 | { | |
101 | struct omap_backlight *bl = dev_get_drvdata(&dev->dev); | |
102 | ||
103 | omapbl_blank(bl, state); | |
104 | bl->powermode = state; | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int omapbl_update_status(struct backlight_device *dev) | |
110 | { | |
111 | struct omap_backlight *bl = dev_get_drvdata(&dev->dev); | |
112 | ||
113 | if (bl->current_intensity != dev->props.brightness) { | |
114 | if (bl->powermode == FB_BLANK_UNBLANK) | |
115 | omapbl_send_intensity(dev->props.brightness); | |
116 | bl->current_intensity = dev->props.brightness; | |
117 | } | |
118 | ||
119 | if (dev->props.fb_blank != bl->powermode) | |
120 | omapbl_set_power(dev, dev->props.fb_blank); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int omapbl_get_intensity(struct backlight_device *dev) | |
126 | { | |
127 | struct omap_backlight *bl = dev_get_drvdata(&dev->dev); | |
128 | return bl->current_intensity; | |
129 | } | |
130 | ||
9905a43b | 131 | static const struct backlight_ops omapbl_ops = { |
ec072b0f AZ |
132 | .get_brightness = omapbl_get_intensity, |
133 | .update_status = omapbl_update_status, | |
134 | }; | |
135 | ||
136 | static int omapbl_probe(struct platform_device *pdev) | |
137 | { | |
a19a6ee6 | 138 | struct backlight_properties props; |
ec072b0f AZ |
139 | struct backlight_device *dev; |
140 | struct omap_backlight *bl; | |
141 | struct omap_backlight_config *pdata = pdev->dev.platform_data; | |
142 | ||
143 | if (!pdata) | |
144 | return -ENXIO; | |
145 | ||
ce969228 JL |
146 | bl = devm_kzalloc(&pdev->dev, sizeof(struct omap_backlight), |
147 | GFP_KERNEL); | |
ec072b0f AZ |
148 | if (unlikely(!bl)) |
149 | return -ENOMEM; | |
150 | ||
a19a6ee6 | 151 | memset(&props, 0, sizeof(struct backlight_properties)); |
bb7ca747 | 152 | props.type = BACKLIGHT_RAW; |
a19a6ee6 MG |
153 | props.max_brightness = OMAPBL_MAX_INTENSITY; |
154 | dev = backlight_device_register("omap-bl", &pdev->dev, bl, &omapbl_ops, | |
155 | &props); | |
ce969228 | 156 | if (IS_ERR(dev)) |
ec072b0f | 157 | return PTR_ERR(dev); |
ec072b0f AZ |
158 | |
159 | bl->powermode = FB_BLANK_POWERDOWN; | |
160 | bl->current_intensity = 0; | |
161 | ||
162 | bl->pdata = pdata; | |
163 | bl->dev = &pdev->dev; | |
164 | ||
165 | platform_set_drvdata(pdev, dev); | |
166 | ||
167 | omap_cfg_reg(PWL); /* Conflicts with UART3 */ | |
168 | ||
169 | dev->props.fb_blank = FB_BLANK_UNBLANK; | |
ec072b0f AZ |
170 | dev->props.brightness = pdata->default_intensity; |
171 | omapbl_update_status(dev); | |
172 | ||
95e93132 | 173 | pr_info("OMAP LCD backlight initialised\n"); |
ec072b0f AZ |
174 | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static int omapbl_remove(struct platform_device *pdev) | |
179 | { | |
180 | struct backlight_device *dev = platform_get_drvdata(pdev); | |
ec072b0f AZ |
181 | |
182 | backlight_device_unregister(dev); | |
ec072b0f AZ |
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 | ||
81178e02 | 197 | module_platform_driver(omapbl_driver); |
ec072b0f AZ |
198 | |
199 | MODULE_AUTHOR("Andrzej Zaborowski <balrog@zabor.org>"); | |
200 | MODULE_DESCRIPTION("OMAP LCD Backlight driver"); | |
201 | MODULE_LICENSE("GPL"); |