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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * LCD Backlight driver for RAVE SP
- *
- * Copyright (C) 2018 Zodiac Inflight Innovations
- *
- */
- #include <linux/backlight.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/mfd/rave-sp.h>
- #include <linux/platform_device.h>
- #define RAVE_SP_BACKLIGHT_LCD_EN BIT(7)
- static int rave_sp_backlight_update_status(struct backlight_device *bd)
- {
- const struct backlight_properties *p = &bd->props;
- const u8 intensity =
- (p->power == FB_BLANK_UNBLANK) ? p->brightness : 0;
- struct rave_sp *sp = dev_get_drvdata(&bd->dev);
- u8 cmd[] = {
- [0] = RAVE_SP_CMD_SET_BACKLIGHT,
- [1] = 0,
- [2] = intensity ? RAVE_SP_BACKLIGHT_LCD_EN | intensity : 0,
- [3] = 0,
- [4] = 0,
- };
- return rave_sp_exec(sp, cmd, sizeof(cmd), NULL, 0);
- }
- static const struct backlight_ops rave_sp_backlight_ops = {
- .options = BL_CORE_SUSPENDRESUME,
- .update_status = rave_sp_backlight_update_status,
- };
- static struct backlight_properties rave_sp_backlight_props = {
- .type = BACKLIGHT_PLATFORM,
- .max_brightness = 100,
- .brightness = 50,
- };
- static int rave_sp_backlight_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct backlight_device *bd;
- bd = devm_backlight_device_register(dev, pdev->name, dev,
- dev_get_drvdata(dev->parent),
- &rave_sp_backlight_ops,
- &rave_sp_backlight_props);
- if (IS_ERR(bd))
- return PTR_ERR(bd);
- /*
- * If there is a phandle pointing to the device node we can
- * assume that another device will manage the status changes.
- * If not we make sure the backlight is in a consistent state.
- */
- if (!dev->of_node->phandle)
- backlight_update_status(bd);
- return 0;
- }
- static const struct of_device_id rave_sp_backlight_of_match[] = {
- { .compatible = "zii,rave-sp-backlight" },
- {}
- };
- static struct platform_driver rave_sp_backlight_driver = {
- .probe = rave_sp_backlight_probe,
- .driver = {
- .name = KBUILD_MODNAME,
- .of_match_table = rave_sp_backlight_of_match,
- },
- };
- module_platform_driver(rave_sp_backlight_driver);
- MODULE_DEVICE_TABLE(of, rave_sp_backlight_of_match);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>");
- MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>");
- MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
- MODULE_DESCRIPTION("RAVE SP Backlight driver");
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