176 lines
3.9 KiB
C
176 lines
3.9 KiB
C
// 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 <balrog@zabor.org>
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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 <balrog@zabor.org>");
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MODULE_DESCRIPTION("OMAP LCD Backlight driver");
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MODULE_LICENSE("GPL");
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