247 строки
6.1 KiB
C
247 строки
6.1 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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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_get_brightness(struct backlight_device *bd)
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{
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return bd->props.brightness;
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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 = dev_get_drvdata(&bd->dev);
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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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.get_brightness = aat2870_bl_get_brightness,
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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 = pdev->dev.platform_data;
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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 = kzalloc(sizeof(struct aat2870_bl_driver_data), GFP_KERNEL);
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if (!aat2870_bl) {
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dev_err(&pdev->dev,
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"Failed to allocate memory for aat2870 backlight\n");
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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 = backlight_device_register("aat2870-backlight", &pdev->dev,
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aat2870_bl, &aat2870_bl_ops, &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_kfree;
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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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goto out_bl_dev_unregister;
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}
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return 0;
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out_bl_dev_unregister:
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backlight_device_unregister(bd);
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out_kfree:
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kfree(aat2870_bl);
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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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backlight_device_unregister(bd);
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kfree(aat2870_bl);
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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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.owner = THIS_MODULE,
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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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