| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Generic Backlight Driver |
| 4 | * |
| 5 | * Copyright (c) 2004-2008 Richard Purdie |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/platform_device.h> |
| 12 | #include <linux/mutex.h> |
| 13 | #include <linux/fb.h> |
| 14 | #include <linux/backlight.h> |
| 15 | |
| 16 | static int genericbl_intensity; |
| 17 | static struct backlight_device *generic_backlight_device; |
| 18 | static struct generic_bl_info *bl_machinfo; |
| 19 | |
| 20 | static int genericbl_send_intensity(struct backlight_device *bd) |
| 21 | { |
| 22 | int intensity = bd->props.brightness; |
| 23 | |
| 24 | if (bd->props.power != FB_BLANK_UNBLANK) |
| 25 | intensity = 0; |
| 26 | if (bd->props.state & BL_CORE_FBBLANK) |
| 27 | intensity = 0; |
| 28 | if (bd->props.state & BL_CORE_SUSPENDED) |
| 29 | intensity = 0; |
| 30 | |
| 31 | bl_machinfo->set_bl_intensity(intensity); |
| 32 | |
| 33 | genericbl_intensity = intensity; |
| 34 | |
| 35 | if (bl_machinfo->kick_battery) |
| 36 | bl_machinfo->kick_battery(); |
| 37 | |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | static int genericbl_get_intensity(struct backlight_device *bd) |
| 42 | { |
| 43 | return genericbl_intensity; |
| 44 | } |
| 45 | |
| 46 | static const struct backlight_ops genericbl_ops = { |
| 47 | .options = BL_CORE_SUSPENDRESUME, |
| 48 | .get_brightness = genericbl_get_intensity, |
| 49 | .update_status = genericbl_send_intensity, |
| 50 | }; |
| 51 | |
| 52 | static int genericbl_probe(struct platform_device *pdev) |
| 53 | { |
| 54 | struct backlight_properties props; |
| 55 | struct generic_bl_info *machinfo = dev_get_platdata(&pdev->dev); |
| 56 | const char *name = "generic-bl"; |
| 57 | struct backlight_device *bd; |
| 58 | |
| 59 | bl_machinfo = machinfo; |
| 60 | if (!machinfo->limit_mask) |
| 61 | machinfo->limit_mask = -1; |
| 62 | |
| 63 | if (machinfo->name) |
| 64 | name = machinfo->name; |
| 65 | |
| 66 | memset(&props, 0, sizeof(struct backlight_properties)); |
| 67 | props.type = BACKLIGHT_RAW; |
| 68 | props.max_brightness = machinfo->max_intensity; |
| 69 | bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev, |
| 70 | NULL, &genericbl_ops, &props); |
| 71 | if (IS_ERR(bd)) |
| 72 | return PTR_ERR(bd); |
| 73 | |
| 74 | platform_set_drvdata(pdev, bd); |
| 75 | |
| 76 | bd->props.power = FB_BLANK_UNBLANK; |
| 77 | bd->props.brightness = machinfo->default_intensity; |
| 78 | backlight_update_status(bd); |
| 79 | |
| 80 | generic_backlight_device = bd; |
| 81 | |
| 82 | dev_info(&pdev->dev, "Generic Backlight Driver Initialized.\n"); |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | static int genericbl_remove(struct platform_device *pdev) |
| 87 | { |
| 88 | struct backlight_device *bd = platform_get_drvdata(pdev); |
| 89 | |
| 90 | bd->props.power = 0; |
| 91 | bd->props.brightness = 0; |
| 92 | backlight_update_status(bd); |
| 93 | |
| 94 | dev_info(&pdev->dev, "Generic Backlight Driver Unloaded\n"); |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static struct platform_driver genericbl_driver = { |
| 99 | .probe = genericbl_probe, |
| 100 | .remove = genericbl_remove, |
| 101 | .driver = { |
| 102 | .name = "generic-bl", |
| 103 | }, |
| 104 | }; |
| 105 | |
| 106 | module_platform_driver(genericbl_driver); |
| 107 | |
| 108 | MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>"); |
| 109 | MODULE_DESCRIPTION("Generic Backlight Driver"); |
| 110 | MODULE_LICENSE("GPL"); |