projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d00ba726 RP |
1 | /* |
| 2 | * Generic Backlight Driver | |
| 3 | * | |
| 4 | * Copyright (c) 2004-2008 Richard Purdie | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/module.h> | |
| 13 | #include <linux/kernel.h> | |
| 14 | #include <linux/init.h> | |
| 15 | #include <linux/platform_device.h> | |
| 16 | #include <linux/mutex.h> | |
| 17 | #include <linux/fb.h> | |
| 18 | #include <linux/backlight.h> | |
| 19 | ||
| 20 | static int genericbl_intensity; | |
| 21 | static struct backlight_device *generic_backlight_device; | |
| 22 | static struct generic_bl_info *bl_machinfo; | |
| 23 | ||
| d00ba726 RP |
24 | static int genericbl_send_intensity(struct backlight_device *bd) |
| 25 | { | |
| 26 | int intensity = bd->props.brightness; | |
| 27 | ||
| 28 | if (bd->props.power != FB_BLANK_UNBLANK) | |
| 29 | intensity = 0; | |
| 30 | if (bd->props.state & BL_CORE_FBBLANK) | |
| 31 | intensity = 0; | |
| 32 | if (bd->props.state & BL_CORE_SUSPENDED) | |
| 33 | intensity = 0; | |
| d00ba726 RP |
34 | |
| 35 | bl_machinfo->set_bl_intensity(intensity); | |
| 36 | ||
| 37 | genericbl_intensity = intensity; | |
| 38 | ||
| 39 | if (bl_machinfo->kick_battery) | |
| 40 | bl_machinfo->kick_battery(); | |
| 41 | ||
| 42 | return 0; | |
| 43 | } | |
| 44 | ||
| 45 | static int genericbl_get_intensity(struct backlight_device *bd) | |
| 46 | { | |
| 47 | return genericbl_intensity; | |
| 48 | } | |
| 49 | ||
| 9905a43b | 50 | static const struct backlight_ops genericbl_ops = { |
| d00ba726 RP |
51 | .options = BL_CORE_SUSPENDRESUME, |
| 52 | .get_brightness = genericbl_get_intensity, | |
| 53 | .update_status = genericbl_send_intensity, | |
| 54 | }; | |
| 55 | ||
| 56 | static int genericbl_probe(struct platform_device *pdev) | |
| 57 | { | |
| a19a6ee6 | 58 | struct backlight_properties props; |
| c512794c | 59 | struct generic_bl_info *machinfo = dev_get_platdata(&pdev->dev); |
| d00ba726 RP |
60 | const char *name = "generic-bl"; |
| 61 | struct backlight_device *bd; | |
| 62 | ||
| 63 | bl_machinfo = machinfo; | |
| 64 | if (!machinfo->limit_mask) | |
| 65 | machinfo->limit_mask = -1; | |
| 66 | ||
| 67 | if (machinfo->name) | |
| 68 | name = machinfo->name; | |
| 69 | ||
| a19a6ee6 | 70 | memset(&props, 0, sizeof(struct backlight_properties)); |
| bb7ca747 | 71 | props.type = BACKLIGHT_RAW; |
| a19a6ee6 | 72 | props.max_brightness = machinfo->max_intensity; |
| de2efd2a JH |
73 | bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev, |
| 74 | NULL, &genericbl_ops, &props); | |
| 933bd9b3 JH |
75 | if (IS_ERR(bd)) |
| 76 | return PTR_ERR(bd); | |
| d00ba726 RP |
77 | |
| 78 | platform_set_drvdata(pdev, bd); | |
| 79 | ||
| d00ba726 RP |
80 | bd->props.power = FB_BLANK_UNBLANK; |
| 81 | bd->props.brightness = machinfo->default_intensity; | |
| 82 | backlight_update_status(bd); | |
| 83 | ||
| 84 | generic_backlight_device = bd; | |
| 85 | ||
| 8ab5aa67 | 86 | dev_info(&pdev->dev, "Generic Backlight Driver Initialized.\n"); |
| d00ba726 RP |
87 | return 0; |
| 88 | } | |
| 89 | ||
| 90 | static int genericbl_remove(struct platform_device *pdev) | |
| 91 | { | |
| 92 | struct backlight_device *bd = platform_get_drvdata(pdev); | |
| 93 | ||
| 94 | bd->props.power = 0; | |
| 95 | bd->props.brightness = 0; | |
| 96 | backlight_update_status(bd); | |
| 97 | ||
| 8ab5aa67 | 98 | dev_info(&pdev->dev, "Generic Backlight Driver Unloaded\n"); |
| d00ba726 RP |
99 | return 0; |
| 100 | } | |
| 101 | ||
| 102 | static struct platform_driver genericbl_driver = { | |
| 103 | .probe = genericbl_probe, | |
| 104 | .remove = genericbl_remove, | |
| 105 | .driver = { | |
| 106 | .name = "generic-bl", | |
| 107 | }, | |
| 108 | }; | |
| 109 | ||
| 81178e02 | 110 | module_platform_driver(genericbl_driver); |
| d00ba726 RP |
111 | |
| 112 | MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>"); | |
| 113 | MODULE_DESCRIPTION("Generic Backlight Driver"); | |
| 114 | MODULE_LICENSE("GPL"); |