| Andriy Skulysh | 06c6f90 | 2006-02-01 03:06:53 -0800 | [diff] [blame^] | 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/device.h> |
| 17 | #include <linux/spinlock.h> |
| 18 | #include <linux/fb.h> |
| 19 | #include <linux/backlight.h> |
| 20 | |
| 21 | #include <asm/cpu/dac.h> |
| 22 | #include <asm/hp6xx/hp6xx.h> |
| 23 | #include <asm/hd64461/hd64461.h> |
| 24 | |
| 25 | #define HP680_MAX_INTENSITY 255 |
| 26 | #define HP680_DEFAULT_INTENSITY 10 |
| 27 | |
| 28 | static int hp680bl_powermode = FB_BLANK_UNBLANK; |
| 29 | static int current_intensity = 0; |
| 30 | static spinlock_t bl_lock = SPIN_LOCK_UNLOCKED; |
| 31 | |
| 32 | static void hp680bl_send_intensity(int intensity) |
| 33 | { |
| 34 | unsigned long flags; |
| 35 | |
| 36 | if (hp680bl_powermode != FB_BLANK_UNBLANK) |
| 37 | intensity = 0; |
| 38 | |
| 39 | spin_lock_irqsave(&bl_lock, flags); |
| 40 | sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS); |
| 41 | spin_unlock_irqrestore(&bl_lock, flags); |
| 42 | } |
| 43 | |
| 44 | static void hp680bl_blank(int blank) |
| 45 | { |
| 46 | u16 v; |
| 47 | |
| 48 | switch(blank) { |
| 49 | |
| 50 | case FB_BLANK_NORMAL: |
| 51 | case FB_BLANK_VSYNC_SUSPEND: |
| 52 | case FB_BLANK_HSYNC_SUSPEND: |
| 53 | case FB_BLANK_POWERDOWN: |
| 54 | if (hp680bl_powermode == FB_BLANK_UNBLANK) { |
| 55 | hp680bl_send_intensity(0); |
| 56 | hp680bl_powermode = blank; |
| 57 | sh_dac_disable(DAC_LCD_BRIGHTNESS); |
| 58 | v = inw(HD64461_GPBDR); |
| 59 | v |= HD64461_GPBDR_LCDOFF; |
| 60 | outw(v, HD64461_GPBDR); |
| 61 | } |
| 62 | break; |
| 63 | case FB_BLANK_UNBLANK: |
| 64 | if (hp680bl_powermode != FB_BLANK_UNBLANK) { |
| 65 | sh_dac_enable(DAC_LCD_BRIGHTNESS); |
| 66 | v = inw(HD64461_GPBDR); |
| 67 | v &= ~HD64461_GPBDR_LCDOFF; |
| 68 | outw(v, HD64461_GPBDR); |
| 69 | hp680bl_powermode = blank; |
| 70 | hp680bl_send_intensity(current_intensity); |
| 71 | } |
| 72 | break; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | #ifdef CONFIG_PM |
| 77 | static int hp680bl_suspend(struct device *dev, pm_message_t state, u32 level) |
| 78 | { |
| 79 | if (level == SUSPEND_POWER_DOWN) |
| 80 | hp680bl_blank(FB_BLANK_POWERDOWN); |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | static int hp680bl_resume(struct device *dev, u32 level) |
| 85 | { |
| 86 | if (level == RESUME_POWER_ON) |
| 87 | hp680bl_blank(FB_BLANK_UNBLANK); |
| 88 | return 0; |
| 89 | } |
| 90 | #else |
| 91 | #define hp680bl_suspend NULL |
| 92 | #define hp680bl_resume NULL |
| 93 | #endif |
| 94 | |
| 95 | |
| 96 | static int hp680bl_set_power(struct backlight_device *bd, int state) |
| 97 | { |
| 98 | hp680bl_blank(state); |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static int hp680bl_get_power(struct backlight_device *bd) |
| 103 | { |
| 104 | return hp680bl_powermode; |
| 105 | } |
| 106 | |
| 107 | static int hp680bl_set_intensity(struct backlight_device *bd, int intensity) |
| 108 | { |
| 109 | if (intensity > HP680_MAX_INTENSITY) |
| 110 | intensity = HP680_MAX_INTENSITY; |
| 111 | hp680bl_send_intensity(intensity); |
| 112 | current_intensity = intensity; |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | static int hp680bl_get_intensity(struct backlight_device *bd) |
| 117 | { |
| 118 | return current_intensity; |
| 119 | } |
| 120 | |
| 121 | static struct backlight_properties hp680bl_data = { |
| 122 | .owner = THIS_MODULE, |
| 123 | .get_power = hp680bl_get_power, |
| 124 | .set_power = hp680bl_set_power, |
| 125 | .max_brightness = HP680_MAX_INTENSITY, |
| 126 | .get_brightness = hp680bl_get_intensity, |
| 127 | .set_brightness = hp680bl_set_intensity, |
| 128 | }; |
| 129 | |
| 130 | static struct backlight_device *hp680_backlight_device; |
| 131 | |
| 132 | static int __init hp680bl_probe(struct device *dev) |
| 133 | { |
| 134 | hp680_backlight_device = backlight_device_register ("hp680-bl", |
| 135 | NULL, &hp680bl_data); |
| 136 | if (IS_ERR (hp680_backlight_device)) |
| 137 | return PTR_ERR (hp680_backlight_device); |
| 138 | |
| 139 | hp680bl_set_intensity(NULL, HP680_DEFAULT_INTENSITY); |
| 140 | |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | static int hp680bl_remove(struct device *dev) |
| 145 | { |
| 146 | backlight_device_unregister(hp680_backlight_device); |
| 147 | |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | static struct device_driver hp680bl_driver = { |
| 152 | .name = "hp680-bl", |
| 153 | .bus = &platform_bus_type, |
| 154 | .probe = hp680bl_probe, |
| 155 | .remove = hp680bl_remove, |
| 156 | .suspend = hp680bl_suspend, |
| 157 | .resume = hp680bl_resume, |
| 158 | }; |
| 159 | |
| 160 | static struct platform_device hp680bl_device = { |
| 161 | .name = "hp680-bl", |
| 162 | .id = -1, |
| 163 | }; |
| 164 | |
| 165 | static int __init hp680bl_init(void) |
| 166 | { |
| 167 | int ret; |
| 168 | |
| 169 | ret=driver_register(&hp680bl_driver); |
| 170 | if (!ret) { |
| 171 | ret = platform_device_register(&hp680bl_device); |
| 172 | if (ret) |
| 173 | driver_unregister(&hp680bl_driver); |
| 174 | } |
| 175 | return ret; |
| 176 | } |
| 177 | |
| 178 | static void __exit hp680bl_exit(void) |
| 179 | { |
| 180 | platform_device_unregister(&hp680bl_device); |
| 181 | driver_unregister(&hp680bl_driver); |
| 182 | } |
| 183 | |
| 184 | module_init(hp680bl_init); |
| 185 | module_exit(hp680bl_exit); |
| 186 | |
| 187 | MODULE_AUTHOR("Andriy Skulysh <askulysh@image.kiev.ua>"); |
| 188 | MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver"); |
| 189 | MODULE_LICENSE("GPL"); |