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Linux/drivers/video/backlight/hp680_bl.c

  1 /*
  2  *  Backlight Driver for HP Jornada 680
  3  *
  4  *  Copyright (c) 2005 Andriy Skulysh
  5  *
  6  *  Based on Sharp's Corgi Backlight Driver
  7  *
  8  * This file is subject to the terms and conditions of the GNU General Public
  9  * License.  See the file "COPYING" in the main directory of this archive
 10  * for more details.
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/kernel.h>
 15 #include <linux/init.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/spinlock.h>
 18 #include <linux/fb.h>
 19 #include <linux/backlight.h>
 20 
 21 #include <cpu/dac.h>
 22 #include <mach/hp6xx.h>
 23 #include <asm/hd64461.h>
 24 
 25 #define HP680_MAX_INTENSITY 255
 26 #define HP680_DEFAULT_INTENSITY 10
 27 
 28 static int hp680bl_suspended;
 29 static int current_intensity;
 30 static DEFINE_SPINLOCK(bl_lock);
 31 
 32 static void hp680bl_send_intensity(struct backlight_device *bd)
 33 {
 34         unsigned long flags;
 35         u16 v;
 36         int intensity = bd->props.brightness;
 37 
 38         if (bd->props.power != FB_BLANK_UNBLANK)
 39                 intensity = 0;
 40         if (bd->props.fb_blank != FB_BLANK_UNBLANK)
 41                 intensity = 0;
 42         if (hp680bl_suspended)
 43                 intensity = 0;
 44 
 45         spin_lock_irqsave(&bl_lock, flags);
 46         if (intensity && current_intensity == 0) {
 47                 sh_dac_enable(DAC_LCD_BRIGHTNESS);
 48                 v = inw(HD64461_GPBDR);
 49                 v &= ~HD64461_GPBDR_LCDOFF;
 50                 outw(v, HD64461_GPBDR);
 51                 sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
 52         } else if (intensity == 0 && current_intensity != 0) {
 53                 sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
 54                 sh_dac_disable(DAC_LCD_BRIGHTNESS);
 55                 v = inw(HD64461_GPBDR);
 56                 v |= HD64461_GPBDR_LCDOFF;
 57                 outw(v, HD64461_GPBDR);
 58         } else if (intensity) {
 59                 sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
 60         }
 61         spin_unlock_irqrestore(&bl_lock, flags);
 62 
 63         current_intensity = intensity;
 64 }
 65 
 66 
 67 #ifdef CONFIG_PM_SLEEP
 68 static int hp680bl_suspend(struct device *dev)
 69 {
 70         struct backlight_device *bd = dev_get_drvdata(dev);
 71 
 72         hp680bl_suspended = 1;
 73         hp680bl_send_intensity(bd);
 74         return 0;
 75 }
 76 
 77 static int hp680bl_resume(struct device *dev)
 78 {
 79         struct backlight_device *bd = dev_get_drvdata(dev);
 80 
 81         hp680bl_suspended = 0;
 82         hp680bl_send_intensity(bd);
 83         return 0;
 84 }
 85 #endif
 86 
 87 static SIMPLE_DEV_PM_OPS(hp680bl_pm_ops, hp680bl_suspend, hp680bl_resume);
 88 
 89 static int hp680bl_set_intensity(struct backlight_device *bd)
 90 {
 91         hp680bl_send_intensity(bd);
 92         return 0;
 93 }
 94 
 95 static int hp680bl_get_intensity(struct backlight_device *bd)
 96 {
 97         return current_intensity;
 98 }
 99 
100 static const struct backlight_ops hp680bl_ops = {
101         .get_brightness = hp680bl_get_intensity,
102         .update_status  = hp680bl_set_intensity,
103 };
104 
105 static int hp680bl_probe(struct platform_device *pdev)
106 {
107         struct backlight_properties props;
108         struct backlight_device *bd;
109 
110         memset(&props, 0, sizeof(struct backlight_properties));
111         props.type = BACKLIGHT_RAW;
112         props.max_brightness = HP680_MAX_INTENSITY;
113         bd = devm_backlight_device_register(&pdev->dev, "hp680-bl", &pdev->dev,
114                                         NULL, &hp680bl_ops, &props);
115         if (IS_ERR(bd))
116                 return PTR_ERR(bd);
117 
118         platform_set_drvdata(pdev, bd);
119 
120         bd->props.brightness = HP680_DEFAULT_INTENSITY;
121         hp680bl_send_intensity(bd);
122 
123         return 0;
124 }
125 
126 static int hp680bl_remove(struct platform_device *pdev)
127 {
128         struct backlight_device *bd = platform_get_drvdata(pdev);
129 
130         bd->props.brightness = 0;
131         bd->props.power = 0;
132         hp680bl_send_intensity(bd);
133 
134         return 0;
135 }
136 
137 static struct platform_driver hp680bl_driver = {
138         .probe          = hp680bl_probe,
139         .remove         = hp680bl_remove,
140         .driver         = {
141                 .name   = "hp680-bl",
142                 .pm     = &hp680bl_pm_ops,
143         },
144 };
145 
146 static struct platform_device *hp680bl_device;
147 
148 static int __init hp680bl_init(void)
149 {
150         int ret;
151 
152         ret = platform_driver_register(&hp680bl_driver);
153         if (ret)
154                 return ret;
155         hp680bl_device = platform_device_register_simple("hp680-bl", -1,
156                                                         NULL, 0);
157         if (IS_ERR(hp680bl_device)) {
158                 platform_driver_unregister(&hp680bl_driver);
159                 return PTR_ERR(hp680bl_device);
160         }
161         return 0;
162 }
163 
164 static void __exit hp680bl_exit(void)
165 {
166         platform_device_unregister(hp680bl_device);
167         platform_driver_unregister(&hp680bl_driver);
168 }
169 
170 module_init(hp680bl_init);
171 module_exit(hp680bl_exit);
172 
173 MODULE_AUTHOR("Andriy Skulysh <askulysh@gmail.com>");
174 MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver");
175 MODULE_LICENSE("GPL");
176 

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