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 24 static int jornada_lcd_get_power(struct lcd_device *ld) 25 { 26 return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; 27 } 28 29 static 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 46 success: 47 jornada_ssp_end(); 48 return ret; 49 } 50 51 static 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 67 success: 68 jornada_ssp_end(); 69 return ret; 70 } 71 72 static 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 84 static 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 91 static 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 } 115 116 static struct platform_driver jornada_lcd_driver = { 117 .probe = jornada_lcd_probe, 118 .driver = { 119 .name = "jornada_lcd", 120 }, 121 }; 122 123 module_platform_driver(jornada_lcd_driver); 124 125 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); 126 MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver"); 127 MODULE_LICENSE("GPL"); 128