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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> |
cc012729 | 28 | #include <linux/platform_data/omap1_bl.h> |
ec072b0f | 29 | |
a09e64fb | 30 | #include <mach/hardware.h> |
70c494c3 | 31 | #include <mach/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 | ||
7a94f653 | 43 | static inline void omapbl_send_intensity(int intensity) |
ec072b0f AZ |
44 | { |
45 | omap_writeb(intensity, OMAP_PWL_ENABLE); | |
46 | } | |
47 | ||
7a94f653 | 48 | static inline void omapbl_send_enable(int enable) |
ec072b0f AZ |
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 | ||
07cac9d7 JH |
74 | #ifdef CONFIG_PM_SLEEP |
75 | static int omapbl_suspend(struct device *dev) | |
ec072b0f | 76 | { |
07cac9d7 JH |
77 | struct backlight_device *bl_dev = dev_get_drvdata(dev); |
78 | struct omap_backlight *bl = bl_get_data(bl_dev); | |
ec072b0f AZ |
79 | |
80 | omapbl_blank(bl, FB_BLANK_POWERDOWN); | |
81 | return 0; | |
82 | } | |
83 | ||
07cac9d7 | 84 | static int omapbl_resume(struct device *dev) |
ec072b0f | 85 | { |
07cac9d7 JH |
86 | struct backlight_device *bl_dev = dev_get_drvdata(dev); |
87 | struct omap_backlight *bl = bl_get_data(bl_dev); | |
ec072b0f AZ |
88 | |
89 | omapbl_blank(bl, bl->powermode); | |
90 | return 0; | |
91 | } | |
ec072b0f AZ |
92 | #endif |
93 | ||
94 | static int omapbl_set_power(struct backlight_device *dev, int state) | |
95 | { | |
5f42d5b2 | 96 | struct omap_backlight *bl = bl_get_data(dev); |
ec072b0f AZ |
97 | |
98 | omapbl_blank(bl, state); | |
99 | bl->powermode = state; | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int omapbl_update_status(struct backlight_device *dev) | |
105 | { | |
5f42d5b2 | 106 | struct omap_backlight *bl = bl_get_data(dev); |
ec072b0f AZ |
107 | |
108 | if (bl->current_intensity != dev->props.brightness) { | |
109 | if (bl->powermode == FB_BLANK_UNBLANK) | |
110 | omapbl_send_intensity(dev->props.brightness); | |
111 | bl->current_intensity = dev->props.brightness; | |
112 | } | |
113 | ||
114 | if (dev->props.fb_blank != bl->powermode) | |
115 | omapbl_set_power(dev, dev->props.fb_blank); | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static int omapbl_get_intensity(struct backlight_device *dev) | |
121 | { | |
5f42d5b2 | 122 | struct omap_backlight *bl = bl_get_data(dev); |
ec072b0f AZ |
123 | return bl->current_intensity; |
124 | } | |
125 | ||
9905a43b | 126 | static const struct backlight_ops omapbl_ops = { |
ec072b0f AZ |
127 | .get_brightness = omapbl_get_intensity, |
128 | .update_status = omapbl_update_status, | |
129 | }; | |
130 | ||
131 | static int omapbl_probe(struct platform_device *pdev) | |
132 | { | |
a19a6ee6 | 133 | struct backlight_properties props; |
ec072b0f AZ |
134 | struct backlight_device *dev; |
135 | struct omap_backlight *bl; | |
c512794c | 136 | struct omap_backlight_config *pdata = dev_get_platdata(&pdev->dev); |
ec072b0f AZ |
137 | |
138 | if (!pdata) | |
139 | return -ENXIO; | |
140 | ||
ce969228 JL |
141 | bl = devm_kzalloc(&pdev->dev, sizeof(struct omap_backlight), |
142 | GFP_KERNEL); | |
ec072b0f AZ |
143 | if (unlikely(!bl)) |
144 | return -ENOMEM; | |
145 | ||
a19a6ee6 | 146 | memset(&props, 0, sizeof(struct backlight_properties)); |
bb7ca747 | 147 | props.type = BACKLIGHT_RAW; |
a19a6ee6 MG |
148 | props.max_brightness = OMAPBL_MAX_INTENSITY; |
149 | dev = backlight_device_register("omap-bl", &pdev->dev, bl, &omapbl_ops, | |
150 | &props); | |
ce969228 | 151 | if (IS_ERR(dev)) |
ec072b0f | 152 | return PTR_ERR(dev); |
ec072b0f AZ |
153 | |
154 | bl->powermode = FB_BLANK_POWERDOWN; | |
155 | bl->current_intensity = 0; | |
156 | ||
157 | bl->pdata = pdata; | |
158 | bl->dev = &pdev->dev; | |
159 | ||
160 | platform_set_drvdata(pdev, dev); | |
161 | ||
162 | omap_cfg_reg(PWL); /* Conflicts with UART3 */ | |
163 | ||
164 | dev->props.fb_blank = FB_BLANK_UNBLANK; | |
ec072b0f AZ |
165 | dev->props.brightness = pdata->default_intensity; |
166 | omapbl_update_status(dev); | |
167 | ||
8e1274a3 | 168 | dev_info(&pdev->dev, "OMAP LCD backlight initialised\n"); |
ec072b0f AZ |
169 | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static int omapbl_remove(struct platform_device *pdev) | |
174 | { | |
175 | struct backlight_device *dev = platform_get_drvdata(pdev); | |
ec072b0f AZ |
176 | |
177 | backlight_device_unregister(dev); | |
ec072b0f AZ |
178 | |
179 | return 0; | |
180 | } | |
181 | ||
07cac9d7 JH |
182 | static SIMPLE_DEV_PM_OPS(omapbl_pm_ops, omapbl_suspend, omapbl_resume); |
183 | ||
ec072b0f AZ |
184 | static struct platform_driver omapbl_driver = { |
185 | .probe = omapbl_probe, | |
186 | .remove = omapbl_remove, | |
ec072b0f AZ |
187 | .driver = { |
188 | .name = "omap-bl", | |
07cac9d7 | 189 | .pm = &omapbl_pm_ops, |
ec072b0f AZ |
190 | }, |
191 | }; | |
192 | ||
81178e02 | 193 | module_platform_driver(omapbl_driver); |
ec072b0f AZ |
194 | |
195 | MODULE_AUTHOR("Andrzej Zaborowski <balrog@zabor.org>"); | |
196 | MODULE_DESCRIPTION("OMAP LCD Backlight driver"); | |
197 | MODULE_LICENSE("GPL"); |