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175 lines
3.9 KiB
175 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Backlight driver for OMAP based boards. |
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* |
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* Copyright (c) 2006 Andrzej Zaborowski <[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/fb.h> |
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#include <linux/backlight.h> |
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#include <linux/slab.h> |
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#include <linux/platform_data/omap1_bl.h> |
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#include <mach/hardware.h> |
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#include <mach/mux.h> |
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#define OMAPBL_MAX_INTENSITY 0xff |
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struct omap_backlight { |
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int powermode; |
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int current_intensity; |
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struct device *dev; |
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struct omap_backlight_config *pdata; |
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}; |
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static inline void omapbl_send_intensity(int intensity) |
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{ |
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omap_writeb(intensity, OMAP_PWL_ENABLE); |
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} |
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static inline void omapbl_send_enable(int enable) |
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{ |
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omap_writeb(enable, OMAP_PWL_CLK_ENABLE); |
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} |
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static void omapbl_blank(struct omap_backlight *bl, int mode) |
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{ |
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if (bl->pdata->set_power) |
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bl->pdata->set_power(bl->dev, mode); |
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switch (mode) { |
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case FB_BLANK_NORMAL: |
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case FB_BLANK_VSYNC_SUSPEND: |
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case FB_BLANK_HSYNC_SUSPEND: |
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case FB_BLANK_POWERDOWN: |
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omapbl_send_intensity(0); |
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omapbl_send_enable(0); |
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break; |
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case FB_BLANK_UNBLANK: |
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omapbl_send_intensity(bl->current_intensity); |
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omapbl_send_enable(1); |
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break; |
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} |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int omapbl_suspend(struct device *dev) |
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{ |
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struct backlight_device *bl_dev = dev_get_drvdata(dev); |
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struct omap_backlight *bl = bl_get_data(bl_dev); |
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omapbl_blank(bl, FB_BLANK_POWERDOWN); |
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return 0; |
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} |
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static int omapbl_resume(struct device *dev) |
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{ |
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struct backlight_device *bl_dev = dev_get_drvdata(dev); |
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struct omap_backlight *bl = bl_get_data(bl_dev); |
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omapbl_blank(bl, bl->powermode); |
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return 0; |
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} |
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#endif |
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static int omapbl_set_power(struct backlight_device *dev, int state) |
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{ |
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struct omap_backlight *bl = bl_get_data(dev); |
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omapbl_blank(bl, state); |
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bl->powermode = state; |
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return 0; |
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} |
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static int omapbl_update_status(struct backlight_device *dev) |
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{ |
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struct omap_backlight *bl = bl_get_data(dev); |
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if (bl->current_intensity != dev->props.brightness) { |
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if (bl->powermode == FB_BLANK_UNBLANK) |
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omapbl_send_intensity(dev->props.brightness); |
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bl->current_intensity = dev->props.brightness; |
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} |
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if (dev->props.fb_blank != bl->powermode) |
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omapbl_set_power(dev, dev->props.fb_blank); |
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return 0; |
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} |
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static int omapbl_get_intensity(struct backlight_device *dev) |
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{ |
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struct omap_backlight *bl = bl_get_data(dev); |
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return bl->current_intensity; |
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} |
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static const struct backlight_ops omapbl_ops = { |
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.get_brightness = omapbl_get_intensity, |
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.update_status = omapbl_update_status, |
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}; |
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static int omapbl_probe(struct platform_device *pdev) |
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{ |
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struct backlight_properties props; |
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struct backlight_device *dev; |
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struct omap_backlight *bl; |
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struct omap_backlight_config *pdata = dev_get_platdata(&pdev->dev); |
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if (!pdata) |
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return -ENXIO; |
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bl = devm_kzalloc(&pdev->dev, sizeof(struct omap_backlight), |
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GFP_KERNEL); |
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if (unlikely(!bl)) |
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return -ENOMEM; |
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memset(&props, 0, sizeof(struct backlight_properties)); |
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props.type = BACKLIGHT_RAW; |
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props.max_brightness = OMAPBL_MAX_INTENSITY; |
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dev = devm_backlight_device_register(&pdev->dev, "omap-bl", &pdev->dev, |
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bl, &omapbl_ops, &props); |
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if (IS_ERR(dev)) |
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return PTR_ERR(dev); |
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bl->powermode = FB_BLANK_POWERDOWN; |
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bl->current_intensity = 0; |
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bl->pdata = pdata; |
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bl->dev = &pdev->dev; |
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platform_set_drvdata(pdev, dev); |
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omap_cfg_reg(PWL); /* Conflicts with UART3 */ |
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dev->props.fb_blank = FB_BLANK_UNBLANK; |
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dev->props.brightness = pdata->default_intensity; |
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omapbl_update_status(dev); |
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dev_info(&pdev->dev, "OMAP LCD backlight initialised\n"); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(omapbl_pm_ops, omapbl_suspend, omapbl_resume); |
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static struct platform_driver omapbl_driver = { |
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.probe = omapbl_probe, |
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.driver = { |
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.name = "omap-bl", |
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.pm = &omapbl_pm_ops, |
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}, |
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}; |
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module_platform_driver(omapbl_driver); |
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MODULE_AUTHOR("Andrzej Zaborowski <[email protected]>"); |
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MODULE_DESCRIPTION("OMAP LCD Backlight driver"); |
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MODULE_LICENSE("GPL");
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