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88 lines
2.3 KiB
88 lines
2.3 KiB
// 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 <[email protected]>"); |
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MODULE_AUTHOR("Nikita Yushchenko <[email protected]>"); |
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MODULE_AUTHOR("Andrey Smirnov <[email protected]>"); |
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MODULE_DESCRIPTION("RAVE SP Backlight driver");
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