mirror of https://gitee.com/openkylin/linux.git
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* iPAQ microcontroller backlight support
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* Author : Linus Walleij <linus.walleij@linaro.org>
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*/
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/mfd/ipaq-micro.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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static int micro_bl_update_status(struct backlight_device *bd)
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{
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struct ipaq_micro *micro = dev_get_drvdata(&bd->dev);
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int intensity = bd->props.brightness;
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struct ipaq_micro_msg msg = {
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.id = MSG_BACKLIGHT,
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.tx_len = 3,
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};
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if (bd->props.power != FB_BLANK_UNBLANK)
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intensity = 0;
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if (bd->props.state & (BL_CORE_FBBLANK | BL_CORE_SUSPENDED))
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intensity = 0;
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/*
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* Message format:
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* Byte 0: backlight instance (usually 1)
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* Byte 1: on/off
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* Byte 2: intensity, 0-255
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*/
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msg.tx_data[0] = 0x01;
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msg.tx_data[1] = intensity > 0 ? 1 : 0;
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msg.tx_data[2] = intensity;
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return ipaq_micro_tx_msg_sync(micro, &msg);
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}
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static const struct backlight_ops micro_bl_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = micro_bl_update_status,
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};
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static const struct backlight_properties micro_bl_props = {
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.type = BACKLIGHT_RAW,
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.max_brightness = 255,
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.power = FB_BLANK_UNBLANK,
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.brightness = 64,
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};
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static int micro_backlight_probe(struct platform_device *pdev)
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{
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struct backlight_device *bd;
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struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
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bd = devm_backlight_device_register(&pdev->dev, "ipaq-micro-backlight",
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&pdev->dev, micro, µ_bl_ops,
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µ_bl_props);
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if (IS_ERR(bd))
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return PTR_ERR(bd);
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platform_set_drvdata(pdev, bd);
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backlight_update_status(bd);
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return 0;
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}
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static struct platform_driver micro_backlight_device_driver = {
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.driver = {
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.name = "ipaq-micro-backlight",
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},
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.probe = micro_backlight_probe,
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};
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module_platform_driver(micro_backlight_device_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("driver for iPAQ Atmel micro backlight");
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MODULE_ALIAS("platform:ipaq-micro-backlight");
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