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