1 /* 2 * 3 * LCD driver for HP Jornada 700 series (710/720/728) 4 * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 8 * 2 or any later version as published by the Free Software Foundation. 9 * 10 */ 11 12 #include <linux/device.h> 13 #include <linux/fb.h> 14 #include <linux/kernel.h> 15 #include <linux/lcd.h> 16 #include <linux/module.h> 17 #include <linux/platform_device.h> 18 #include <linux/delay.h> 19 20 #include <mach/jornada720.h> 21 #include <mach/hardware.h> 22 23 #include <video/s1d13xxxfb.h> 24 25 #define LCD_MAX_CONTRAST 0xff 26 #define LCD_DEF_CONTRAST 0x80 27 28 static int jornada_lcd_get_power(struct lcd_device *ld) 29 { 30 /* LDD2 in PPC = LCD POWER */ 31 if (PPSR & PPC_LDD2) 32 return FB_BLANK_UNBLANK; /* PW ON */ 33 else 34 return FB_BLANK_POWERDOWN; /* PW OFF */ 35 } 36 37 static int jornada_lcd_get_contrast(struct lcd_device *ld) 38 { 39 int ret; 40 41 if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK) 42 return 0; 43 44 jornada_ssp_start(); 45 46 if (jornada_ssp_byte(GETCONTRAST) != TXDUMMY) { 47 dev_err(&ld->dev, "get contrast failed\n"); 48 jornada_ssp_end(); 49 return -ETIMEDOUT; 50 } else { 51 ret = jornada_ssp_byte(TXDUMMY); 52 jornada_ssp_end(); 53 return ret; 54 } 55 } 56 57 static int jornada_lcd_set_contrast(struct lcd_device *ld, int value) 58 { 59 int ret; 60 61 jornada_ssp_start(); 62 63 /* start by sending our set contrast cmd to mcu */ 64 ret = jornada_ssp_byte(SETCONTRAST); 65 66 /* push the new value */ 67 if (jornada_ssp_byte(value) != TXDUMMY) { 68 dev_err(&ld->dev, "set contrast failed\n"); 69 jornada_ssp_end(); 70 return -ETIMEDOUT; 71 } 72 73 /* if we get here we can assume everything went well */ 74 jornada_ssp_end(); 75 76 return 0; 77 } 78 79 static int jornada_lcd_set_power(struct lcd_device *ld, int power) 80 { 81 if (power != FB_BLANK_UNBLANK) { 82 PPSR &= ~PPC_LDD2; 83 PPDR |= PPC_LDD2; 84 } else { 85 PPSR |= PPC_LDD2; 86 } 87 88 return 0; 89 } 90 91 static struct lcd_ops jornada_lcd_props = { 92 .get_contrast = jornada_lcd_get_contrast, 93 .set_contrast = jornada_lcd_set_contrast, 94 .get_power = jornada_lcd_get_power, 95 .set_power = jornada_lcd_set_power, 96 }; 97 98 static int jornada_lcd_probe(struct platform_device *pdev) 99 { 100 struct lcd_device *lcd_device; 101 int ret; 102 103 lcd_device = lcd_device_register(S1D_DEVICENAME, &pdev->dev, NULL, &jornada_lcd_props); 104 105 if (IS_ERR(lcd_device)) { 106 ret = PTR_ERR(lcd_device); 107 dev_err(&pdev->dev, "failed to register device\n"); 108 return ret; 109 } 110 111 platform_set_drvdata(pdev, lcd_device); 112 113 /* lets set our default values */ 114 jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST); 115 jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK); 116 /* give it some time to startup */ 117 msleep(100); 118 119 return 0; 120 } 121 122 static int jornada_lcd_remove(struct platform_device *pdev) 123 { 124 struct lcd_device *lcd_device = platform_get_drvdata(pdev); 125 126 lcd_device_unregister(lcd_device); 127 128 return 0; 129 } 130 131 static struct platform_driver jornada_lcd_driver = { 132 .probe = jornada_lcd_probe, 133 .remove = jornada_lcd_remove, 134 .driver = { 135 .name = "jornada_lcd", 136 }, 137 }; 138 139 module_platform_driver(jornada_lcd_driver); 140 141 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); 142 MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver"); 143 MODULE_LICENSE("GPL"); 144