jornada720_lcd.c

  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/io.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 ? LCD_POWER_ON : LCD_POWER_OFF;
 27}
 28
 29static int jornada_lcd_get_contrast(struct lcd_device *ld)
 30{
 31	int ret;
 32
 33	if (jornada_lcd_get_power(ld) != LCD_POWER_ON)
 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 != LCD_POWER_ON) {
 75		PPSR &= ~PPC_LDD2;
 76		PPDR |= PPC_LDD2;
 77	} else {
 78		PPSR |= PPC_LDD2;
 79	}
 80
 81	return 0;
 82}
 83
 84static const 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, LCD_POWER_ON);
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");