154 lines
3.4 KiB
C
154 lines
3.4 KiB
C
/*
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*
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* LCD driver for HP Jornada 700 series (710/720/728)
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* Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 or any later version as published by the Free Software Foundation.
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*
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*/
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#include <linux/device.h>
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#include <linux/fb.h>
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#include <linux/kernel.h>
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#include <linux/lcd.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <mach/jornada720.h>
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#include <mach/hardware.h>
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#include <video/s1d13xxxfb.h>
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#define LCD_MAX_CONTRAST 0xff
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#define LCD_DEF_CONTRAST 0x80
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static int jornada_lcd_get_power(struct lcd_device *dev)
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{
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/* LDD2 in PPC = LCD POWER */
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if (PPSR & PPC_LDD2)
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return FB_BLANK_UNBLANK; /* PW ON */
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else
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return FB_BLANK_POWERDOWN; /* PW OFF */
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}
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static int jornada_lcd_get_contrast(struct lcd_device *dev)
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{
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int ret;
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if (jornada_lcd_get_power(dev) != FB_BLANK_UNBLANK)
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return 0;
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jornada_ssp_start();
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if (jornada_ssp_byte(GETCONTRAST) != TXDUMMY) {
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printk(KERN_ERR "lcd: get contrast failed\n");
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jornada_ssp_end();
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return -ETIMEDOUT;
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} else {
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ret = jornada_ssp_byte(TXDUMMY);
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jornada_ssp_end();
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return ret;
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}
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}
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static int jornada_lcd_set_contrast(struct lcd_device *dev, int value)
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{
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int ret;
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jornada_ssp_start();
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/* start by sending our set contrast cmd to mcu */
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ret = jornada_ssp_byte(SETCONTRAST);
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/* push the new value */
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if (jornada_ssp_byte(value) != TXDUMMY) {
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printk(KERN_ERR "lcd : set contrast failed\n");
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jornada_ssp_end();
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return -ETIMEDOUT;
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}
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/* if we get here we can assume everything went well */
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jornada_ssp_end();
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return 0;
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}
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static int jornada_lcd_set_power(struct lcd_device *dev, int power)
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{
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if (power != FB_BLANK_UNBLANK) {
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PPSR &= ~PPC_LDD2;
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PPDR |= PPC_LDD2;
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} else
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PPSR |= PPC_LDD2;
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return 0;
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}
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static struct lcd_ops jornada_lcd_props = {
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.get_contrast = jornada_lcd_get_contrast,
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.set_contrast = jornada_lcd_set_contrast,
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.get_power = jornada_lcd_get_power,
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.set_power = jornada_lcd_set_power,
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};
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static int jornada_lcd_probe(struct platform_device *pdev)
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{
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struct lcd_device *lcd_device;
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int ret;
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lcd_device = lcd_device_register(S1D_DEVICENAME, &pdev->dev, NULL, &jornada_lcd_props);
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if (IS_ERR(lcd_device)) {
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ret = PTR_ERR(lcd_device);
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printk(KERN_ERR "lcd : failed to register device\n");
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return ret;
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}
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platform_set_drvdata(pdev, lcd_device);
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/* lets set our default values */
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jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
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jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
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/* give it some time to startup */
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msleep(100);
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return 0;
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}
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static int jornada_lcd_remove(struct platform_device *pdev)
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{
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struct lcd_device *lcd_device = platform_get_drvdata(pdev);
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lcd_device_unregister(lcd_device);
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return 0;
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}
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static struct platform_driver jornada_lcd_driver = {
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.probe = jornada_lcd_probe,
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.remove = jornada_lcd_remove,
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.driver = {
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.name = "jornada_lcd",
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},
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};
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int __init jornada_lcd_init(void)
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{
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return platform_driver_register(&jornada_lcd_driver);
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}
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void __exit jornada_lcd_exit(void)
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{
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platform_driver_unregister(&jornada_lcd_driver);
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}
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MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
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MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
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MODULE_LICENSE("GPL");
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module_init(jornada_lcd_init);
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module_exit(jornada_lcd_exit);
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