Richard Purdie | d00ba72 | 2009-01-08 20:52:37 +0000 | [diff] [blame] | 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 | |
Richard Purdie | d00ba72 | 2009-01-08 20:52:37 +0000 | [diff] [blame] | 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; |
Richard Purdie | d00ba72 | 2009-01-08 20:52:37 +0000 | [diff] [blame] | 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 | |
Emese Revfy | 9905a43 | 2009-12-14 00:58:57 +0100 | [diff] [blame] | 50 | static const struct backlight_ops genericbl_ops = { |
Richard Purdie | d00ba72 | 2009-01-08 20:52:37 +0000 | [diff] [blame] | 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 | { |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 58 | struct backlight_properties props; |
Jingoo Han | c512794c | 2013-11-12 15:09:04 -0800 | [diff] [blame] | 59 | struct generic_bl_info *machinfo = dev_get_platdata(&pdev->dev); |
Richard Purdie | d00ba72 | 2009-01-08 20:52:37 +0000 | [diff] [blame] | 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 | |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 70 | memset(&props, 0, sizeof(struct backlight_properties)); |
Matthew Garrett | bb7ca74 | 2011-03-22 16:30:21 -0700 | [diff] [blame] | 71 | props.type = BACKLIGHT_RAW; |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 72 | props.max_brightness = machinfo->max_intensity; |
Jingoo Han | de2efd2 | 2013-11-12 15:09:15 -0800 | [diff] [blame] | 73 | bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev, |
| 74 | NULL, &genericbl_ops, &props); |
Jingoo Han | 933bd9b | 2012-12-17 16:00:17 -0800 | [diff] [blame] | 75 | if (IS_ERR(bd)) |
| 76 | return PTR_ERR(bd); |
Richard Purdie | d00ba72 | 2009-01-08 20:52:37 +0000 | [diff] [blame] | 77 | |
| 78 | platform_set_drvdata(pdev, bd); |
| 79 | |
Richard Purdie | d00ba72 | 2009-01-08 20:52:37 +0000 | [diff] [blame] | 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 | |
Jingoo Han | 8ab5aa6 | 2013-04-29 16:17:33 -0700 | [diff] [blame] | 86 | dev_info(&pdev->dev, "Generic Backlight Driver Initialized.\n"); |
Richard Purdie | d00ba72 | 2009-01-08 20:52:37 +0000 | [diff] [blame] | 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 | |
Jingoo Han | 8ab5aa6 | 2013-04-29 16:17:33 -0700 | [diff] [blame] | 98 | dev_info(&pdev->dev, "Generic Backlight Driver Unloaded\n"); |
Richard Purdie | d00ba72 | 2009-01-08 20:52:37 +0000 | [diff] [blame] | 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 | |
Axel Lin | 81178e0 | 2012-01-10 15:09:11 -0800 | [diff] [blame] | 110 | module_platform_driver(genericbl_driver); |
Richard Purdie | d00ba72 | 2009-01-08 20:52:37 +0000 | [diff] [blame] | 111 | |
| 112 | MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>"); |
| 113 | MODULE_DESCRIPTION("Generic Backlight Driver"); |
| 114 | MODULE_LICENSE("GPL"); |