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