| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | |
| 3 | /* |
| 4 | * LCD Backlight driver for RAVE SP |
| 5 | * |
| 6 | * Copyright (C) 2018 Zodiac Inflight Innovations |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #include <linux/backlight.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/mfd/rave-sp.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | |
| 16 | #define RAVE_SP_BACKLIGHT_LCD_EN BIT(7) |
| 17 | |
| 18 | static int rave_sp_backlight_update_status(struct backlight_device *bd) |
| 19 | { |
| 20 | const struct backlight_properties *p = &bd->props; |
| 21 | const u8 intensity = |
| 22 | (p->power == FB_BLANK_UNBLANK) ? p->brightness : 0; |
| 23 | struct rave_sp *sp = dev_get_drvdata(&bd->dev); |
| 24 | u8 cmd[] = { |
| 25 | [0] = RAVE_SP_CMD_SET_BACKLIGHT, |
| 26 | [1] = 0, |
| 27 | [2] = intensity ? RAVE_SP_BACKLIGHT_LCD_EN | intensity : 0, |
| 28 | [3] = 0, |
| 29 | [4] = 0, |
| 30 | }; |
| 31 | |
| 32 | return rave_sp_exec(sp, cmd, sizeof(cmd), NULL, 0); |
| 33 | } |
| 34 | |
| 35 | static const struct backlight_ops rave_sp_backlight_ops = { |
| 36 | .options = BL_CORE_SUSPENDRESUME, |
| 37 | .update_status = rave_sp_backlight_update_status, |
| 38 | }; |
| 39 | |
| 40 | static struct backlight_properties rave_sp_backlight_props = { |
| 41 | .type = BACKLIGHT_PLATFORM, |
| 42 | .max_brightness = 100, |
| 43 | .brightness = 50, |
| 44 | }; |
| 45 | |
| 46 | static int rave_sp_backlight_probe(struct platform_device *pdev) |
| 47 | { |
| 48 | struct device *dev = &pdev->dev; |
| 49 | struct backlight_device *bd; |
| 50 | |
| 51 | bd = devm_backlight_device_register(dev, pdev->name, dev->parent, |
| 52 | dev_get_drvdata(dev->parent), |
| 53 | &rave_sp_backlight_ops, |
| 54 | &rave_sp_backlight_props); |
| 55 | if (IS_ERR(bd)) |
| 56 | return PTR_ERR(bd); |
| 57 | |
| 58 | backlight_update_status(bd); |
| 59 | |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static const struct of_device_id rave_sp_backlight_of_match[] = { |
| 64 | { .compatible = "zii,rave-sp-backlight" }, |
| 65 | {} |
| 66 | }; |
| 67 | |
| 68 | static struct platform_driver rave_sp_backlight_driver = { |
| 69 | .probe = rave_sp_backlight_probe, |
| 70 | .driver = { |
| 71 | .name = KBUILD_MODNAME, |
| 72 | .of_match_table = rave_sp_backlight_of_match, |
| 73 | }, |
| 74 | }; |
| 75 | module_platform_driver(rave_sp_backlight_driver); |
| 76 | |
| 77 | MODULE_DEVICE_TABLE(of, rave_sp_backlight_of_match); |
| 78 | MODULE_LICENSE("GPL"); |
| 79 | MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>"); |
| 80 | MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>"); |
| 81 | MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>"); |
| 82 | MODULE_DESCRIPTION("RAVE SP Backlight driver"); |