cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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omap1_bl.c (3997B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Backlight driver for OMAP based boards.
      4 *
      5 * Copyright (c) 2006 Andrzej Zaborowski  <balrog@zabor.org>
      6 */
      7
      8#include <linux/module.h>
      9#include <linux/kernel.h>
     10#include <linux/init.h>
     11#include <linux/platform_device.h>
     12#include <linux/fb.h>
     13#include <linux/backlight.h>
     14#include <linux/slab.h>
     15#include <linux/platform_data/omap1_bl.h>
     16
     17#include <linux/soc/ti/omap1-io.h>
     18#include <linux/soc/ti/omap1-mux.h>
     19
     20#define OMAPBL_MAX_INTENSITY		0xff
     21
     22struct omap_backlight {
     23	int powermode;
     24	int current_intensity;
     25
     26	struct device *dev;
     27	struct omap_backlight_config *pdata;
     28};
     29
     30static inline void omapbl_send_intensity(int intensity)
     31{
     32	omap_writeb(intensity, OMAP_PWL_ENABLE);
     33}
     34
     35static inline void omapbl_send_enable(int enable)
     36{
     37	omap_writeb(enable, OMAP_PWL_CLK_ENABLE);
     38}
     39
     40static void omapbl_blank(struct omap_backlight *bl, int mode)
     41{
     42	if (bl->pdata->set_power)
     43		bl->pdata->set_power(bl->dev, mode);
     44
     45	switch (mode) {
     46	case FB_BLANK_NORMAL:
     47	case FB_BLANK_VSYNC_SUSPEND:
     48	case FB_BLANK_HSYNC_SUSPEND:
     49	case FB_BLANK_POWERDOWN:
     50		omapbl_send_intensity(0);
     51		omapbl_send_enable(0);
     52		break;
     53
     54	case FB_BLANK_UNBLANK:
     55		omapbl_send_intensity(bl->current_intensity);
     56		omapbl_send_enable(1);
     57		break;
     58	}
     59}
     60
     61#ifdef CONFIG_PM_SLEEP
     62static int omapbl_suspend(struct device *dev)
     63{
     64	struct backlight_device *bl_dev = dev_get_drvdata(dev);
     65	struct omap_backlight *bl = bl_get_data(bl_dev);
     66
     67	omapbl_blank(bl, FB_BLANK_POWERDOWN);
     68	return 0;
     69}
     70
     71static int omapbl_resume(struct device *dev)
     72{
     73	struct backlight_device *bl_dev = dev_get_drvdata(dev);
     74	struct omap_backlight *bl = bl_get_data(bl_dev);
     75
     76	omapbl_blank(bl, bl->powermode);
     77	return 0;
     78}
     79#endif
     80
     81static int omapbl_set_power(struct backlight_device *dev, int state)
     82{
     83	struct omap_backlight *bl = bl_get_data(dev);
     84
     85	omapbl_blank(bl, state);
     86	bl->powermode = state;
     87
     88	return 0;
     89}
     90
     91static int omapbl_update_status(struct backlight_device *dev)
     92{
     93	struct omap_backlight *bl = bl_get_data(dev);
     94
     95	if (bl->current_intensity != dev->props.brightness) {
     96		if (bl->powermode == FB_BLANK_UNBLANK)
     97			omapbl_send_intensity(dev->props.brightness);
     98		bl->current_intensity = dev->props.brightness;
     99	}
    100
    101	if (dev->props.fb_blank != bl->powermode)
    102		omapbl_set_power(dev, dev->props.fb_blank);
    103
    104	return 0;
    105}
    106
    107static int omapbl_get_intensity(struct backlight_device *dev)
    108{
    109	struct omap_backlight *bl = bl_get_data(dev);
    110
    111	return bl->current_intensity;
    112}
    113
    114static const struct backlight_ops omapbl_ops = {
    115	.get_brightness = omapbl_get_intensity,
    116	.update_status  = omapbl_update_status,
    117};
    118
    119static int omapbl_probe(struct platform_device *pdev)
    120{
    121	struct backlight_properties props;
    122	struct backlight_device *dev;
    123	struct omap_backlight *bl;
    124	struct omap_backlight_config *pdata = dev_get_platdata(&pdev->dev);
    125
    126	if (!pdata)
    127		return -ENXIO;
    128
    129	bl = devm_kzalloc(&pdev->dev, sizeof(struct omap_backlight),
    130			  GFP_KERNEL);
    131	if (unlikely(!bl))
    132		return -ENOMEM;
    133
    134	memset(&props, 0, sizeof(struct backlight_properties));
    135	props.type = BACKLIGHT_RAW;
    136	props.max_brightness = OMAPBL_MAX_INTENSITY;
    137	dev = devm_backlight_device_register(&pdev->dev, "omap-bl", &pdev->dev,
    138					bl, &omapbl_ops, &props);
    139	if (IS_ERR(dev))
    140		return PTR_ERR(dev);
    141
    142	bl->powermode = FB_BLANK_POWERDOWN;
    143	bl->current_intensity = 0;
    144
    145	bl->pdata = pdata;
    146	bl->dev = &pdev->dev;
    147
    148	platform_set_drvdata(pdev, dev);
    149
    150	omap_cfg_reg(PWL);	/* Conflicts with UART3 */
    151
    152	dev->props.fb_blank = FB_BLANK_UNBLANK;
    153	dev->props.brightness = pdata->default_intensity;
    154	omapbl_update_status(dev);
    155
    156	dev_info(&pdev->dev, "OMAP LCD backlight initialised\n");
    157
    158	return 0;
    159}
    160
    161static SIMPLE_DEV_PM_OPS(omapbl_pm_ops, omapbl_suspend, omapbl_resume);
    162
    163static struct platform_driver omapbl_driver = {
    164	.probe		= omapbl_probe,
    165	.driver		= {
    166		.name	= "omap-bl",
    167		.pm	= &omapbl_pm_ops,
    168	},
    169};
    170
    171module_platform_driver(omapbl_driver);
    172
    173MODULE_AUTHOR("Andrzej Zaborowski <balrog@zabor.org>");
    174MODULE_DESCRIPTION("OMAP LCD Backlight driver");
    175MODULE_LICENSE("GPL");