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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 246 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.674189849@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
221 lines
5.1 KiB
C
221 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/drivers/video/backlight/aat2870_bl.c
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*
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* Copyright (c) 2011, NVIDIA Corporation.
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* Author: Jin Park <jinyoungp@nvidia.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#include <linux/fb.h>
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#include <linux/backlight.h>
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#include <linux/mfd/aat2870.h>
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struct aat2870_bl_driver_data {
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struct platform_device *pdev;
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struct backlight_device *bd;
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int channels;
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int max_current;
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int brightness; /* current brightness */
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};
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static inline int aat2870_brightness(struct aat2870_bl_driver_data *aat2870_bl,
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int brightness)
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{
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struct backlight_device *bd = aat2870_bl->bd;
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int val;
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val = brightness * (aat2870_bl->max_current - 1);
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val /= bd->props.max_brightness;
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return val;
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}
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static inline int aat2870_bl_enable(struct aat2870_bl_driver_data *aat2870_bl)
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{
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struct aat2870_data *aat2870
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= dev_get_drvdata(aat2870_bl->pdev->dev.parent);
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return aat2870->write(aat2870, AAT2870_BL_CH_EN,
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(u8)aat2870_bl->channels);
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}
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static inline int aat2870_bl_disable(struct aat2870_bl_driver_data *aat2870_bl)
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{
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struct aat2870_data *aat2870
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= dev_get_drvdata(aat2870_bl->pdev->dev.parent);
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return aat2870->write(aat2870, AAT2870_BL_CH_EN, 0x0);
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}
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static int aat2870_bl_update_status(struct backlight_device *bd)
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{
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struct aat2870_bl_driver_data *aat2870_bl = bl_get_data(bd);
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struct aat2870_data *aat2870 =
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dev_get_drvdata(aat2870_bl->pdev->dev.parent);
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int brightness = bd->props.brightness;
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int ret;
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if ((brightness < 0) || (bd->props.max_brightness < brightness)) {
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dev_err(&bd->dev, "invalid brightness, %d\n", brightness);
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return -EINVAL;
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}
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dev_dbg(&bd->dev, "brightness=%d, power=%d, state=%d\n",
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bd->props.brightness, bd->props.power, bd->props.state);
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if ((bd->props.power != FB_BLANK_UNBLANK) ||
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(bd->props.state & BL_CORE_FBBLANK) ||
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(bd->props.state & BL_CORE_SUSPENDED))
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brightness = 0;
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ret = aat2870->write(aat2870, AAT2870_BLM,
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(u8)aat2870_brightness(aat2870_bl, brightness));
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if (ret < 0)
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return ret;
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if (brightness == 0) {
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ret = aat2870_bl_disable(aat2870_bl);
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if (ret < 0)
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return ret;
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} else if (aat2870_bl->brightness == 0) {
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ret = aat2870_bl_enable(aat2870_bl);
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if (ret < 0)
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return ret;
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}
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aat2870_bl->brightness = brightness;
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return 0;
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}
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static int aat2870_bl_check_fb(struct backlight_device *bd, struct fb_info *fi)
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{
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return 1;
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}
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static const struct backlight_ops aat2870_bl_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = aat2870_bl_update_status,
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.check_fb = aat2870_bl_check_fb,
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};
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static int aat2870_bl_probe(struct platform_device *pdev)
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{
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struct aat2870_bl_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct aat2870_bl_driver_data *aat2870_bl;
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struct backlight_device *bd;
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struct backlight_properties props;
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int ret = 0;
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if (!pdata) {
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dev_err(&pdev->dev, "No platform data\n");
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ret = -ENXIO;
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goto out;
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}
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if (pdev->id != AAT2870_ID_BL) {
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dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
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ret = -EINVAL;
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goto out;
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}
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aat2870_bl = devm_kzalloc(&pdev->dev,
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sizeof(struct aat2870_bl_driver_data),
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GFP_KERNEL);
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if (!aat2870_bl) {
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ret = -ENOMEM;
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goto out;
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}
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memset(&props, 0, sizeof(struct backlight_properties));
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props.type = BACKLIGHT_RAW;
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bd = devm_backlight_device_register(&pdev->dev, "aat2870-backlight",
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&pdev->dev, aat2870_bl, &aat2870_bl_ops,
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&props);
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if (IS_ERR(bd)) {
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dev_err(&pdev->dev,
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"Failed allocate memory for backlight device\n");
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ret = PTR_ERR(bd);
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goto out;
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}
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aat2870_bl->pdev = pdev;
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platform_set_drvdata(pdev, aat2870_bl);
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aat2870_bl->bd = bd;
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if (pdata->channels > 0)
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aat2870_bl->channels = pdata->channels;
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else
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aat2870_bl->channels = AAT2870_BL_CH_ALL;
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if (pdata->max_current > 0)
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aat2870_bl->max_current = pdata->max_current;
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else
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aat2870_bl->max_current = AAT2870_CURRENT_27_9;
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if (pdata->max_brightness > 0)
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bd->props.max_brightness = pdata->max_brightness;
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else
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bd->props.max_brightness = 255;
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aat2870_bl->brightness = 0;
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bd->props.power = FB_BLANK_UNBLANK;
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bd->props.brightness = bd->props.max_brightness;
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ret = aat2870_bl_update_status(bd);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to initialize\n");
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return ret;
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}
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return 0;
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out:
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return ret;
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}
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static int aat2870_bl_remove(struct platform_device *pdev)
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{
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struct aat2870_bl_driver_data *aat2870_bl = platform_get_drvdata(pdev);
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struct backlight_device *bd = aat2870_bl->bd;
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bd->props.power = FB_BLANK_POWERDOWN;
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bd->props.brightness = 0;
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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 aat2870_bl_driver = {
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.driver = {
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.name = "aat2870-backlight",
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},
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.probe = aat2870_bl_probe,
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.remove = aat2870_bl_remove,
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};
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static int __init aat2870_bl_init(void)
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{
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return platform_driver_register(&aat2870_bl_driver);
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}
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subsys_initcall(aat2870_bl_init);
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static void __exit aat2870_bl_exit(void)
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{
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platform_driver_unregister(&aat2870_bl_driver);
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}
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module_exit(aat2870_bl_exit);
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MODULE_DESCRIPTION("AnalogicTech AAT2870 Backlight");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
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