linux-stable/drivers/video/backlight/omap1_bl.c
Thomas Gleixner 3bf4200603 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 154
Based on 1 normalized pattern(s):

  this package is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this package 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 package 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-or-later

has been chosen to replace the boilerplate/reference in 1 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Armijn Hemel <armijn@tjaldur.nl>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.930071175@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:33 -07:00

175 lines
3.9 KiB
C

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