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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jornada720_lcd.c (2769B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *
      4 * LCD driver for HP Jornada 700 series (710/720/728)
      5 * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
      6 */
      7
      8#include <linux/device.h>
      9#include <linux/fb.h>
     10#include <linux/kernel.h>
     11#include <linux/lcd.h>
     12#include <linux/module.h>
     13#include <linux/platform_device.h>
     14#include <linux/delay.h>
     15
     16#include <mach/jornada720.h>
     17#include <mach/hardware.h>
     18
     19#include <video/s1d13xxxfb.h>
     20
     21#define LCD_MAX_CONTRAST	0xff
     22#define LCD_DEF_CONTRAST	0x80
     23
     24static int jornada_lcd_get_power(struct lcd_device *ld)
     25{
     26	return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
     27}
     28
     29static int jornada_lcd_get_contrast(struct lcd_device *ld)
     30{
     31	int ret;
     32
     33	if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
     34		return 0;
     35
     36	jornada_ssp_start();
     37
     38	if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
     39		ret = jornada_ssp_byte(TXDUMMY);
     40		goto success;
     41	}
     42
     43	dev_err(&ld->dev, "failed to set contrast\n");
     44	ret = -ETIMEDOUT;
     45
     46success:
     47	jornada_ssp_end();
     48	return ret;
     49}
     50
     51static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
     52{
     53	int ret = 0;
     54
     55	jornada_ssp_start();
     56
     57	/* start by sending our set contrast cmd to mcu */
     58	if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
     59		/* if successful push the new value */
     60		if (jornada_ssp_byte(value) == TXDUMMY)
     61			goto success;
     62	}
     63
     64	dev_err(&ld->dev, "failed to set contrast\n");
     65	ret = -ETIMEDOUT;
     66
     67success:
     68	jornada_ssp_end();
     69	return ret;
     70}
     71
     72static int jornada_lcd_set_power(struct lcd_device *ld, int power)
     73{
     74	if (power != FB_BLANK_UNBLANK) {
     75		PPSR &= ~PPC_LDD2;
     76		PPDR |= PPC_LDD2;
     77	} else {
     78		PPSR |= PPC_LDD2;
     79	}
     80
     81	return 0;
     82}
     83
     84static struct lcd_ops jornada_lcd_props = {
     85	.get_contrast = jornada_lcd_get_contrast,
     86	.set_contrast = jornada_lcd_set_contrast,
     87	.get_power = jornada_lcd_get_power,
     88	.set_power = jornada_lcd_set_power,
     89};
     90
     91static int jornada_lcd_probe(struct platform_device *pdev)
     92{
     93	struct lcd_device *lcd_device;
     94	int ret;
     95
     96	lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
     97					&pdev->dev, NULL, &jornada_lcd_props);
     98
     99	if (IS_ERR(lcd_device)) {
    100		ret = PTR_ERR(lcd_device);
    101		dev_err(&pdev->dev, "failed to register device\n");
    102		return ret;
    103	}
    104
    105	platform_set_drvdata(pdev, lcd_device);
    106
    107	/* lets set our default values */
    108	jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
    109	jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
    110	/* give it some time to startup */
    111	msleep(100);
    112
    113	return 0;
    114}
    115
    116static struct platform_driver jornada_lcd_driver = {
    117	.probe	= jornada_lcd_probe,
    118	.driver	= {
    119		.name	= "jornada_lcd",
    120	},
    121};
    122
    123module_platform_driver(jornada_lcd_driver);
    124
    125MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
    126MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
    127MODULE_LICENSE("GPL");