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220 lines
5.1 KiB
220 lines
5.1 KiB
// 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 <[email protected]> |
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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 <[email protected]>");
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