1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Based on drivers/video/omap/lcd_inn1510.c 4 * 5 * LCD panel support for the Amstrad E3 (Delta) videophone. 6 * 7 * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/platform_device.h> 12 #include <linux/io.h> 13 #include <linux/delay.h> 14 #include <linux/gpio/consumer.h> 15 #include <linux/lcd.h> 16 17 #include <linux/soc/ti/omap1-io.h> 18 19 #include "omapfb.h" 20 21 #define AMS_DELTA_DEFAULT_CONTRAST 112 22 23 #define AMS_DELTA_MAX_CONTRAST 0x00FF 24 #define AMS_DELTA_LCD_POWER 0x0100 25 26 27 /* LCD class device section */ 28 29 static int ams_delta_lcd; 30 static struct gpio_desc *gpiod_vblen; 31 static struct gpio_desc *gpiod_ndisp; 32 33 static int ams_delta_lcd_set_power(struct lcd_device *dev, int power) 34 { 35 if (power == FB_BLANK_UNBLANK) { 36 if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) { 37 omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST, 38 OMAP_PWL_ENABLE); 39 omap_writeb(1, OMAP_PWL_CLK_ENABLE); 40 ams_delta_lcd |= AMS_DELTA_LCD_POWER; 41 } 42 } else { 43 if (ams_delta_lcd & AMS_DELTA_LCD_POWER) { 44 omap_writeb(0, OMAP_PWL_ENABLE); 45 omap_writeb(0, OMAP_PWL_CLK_ENABLE); 46 ams_delta_lcd &= ~AMS_DELTA_LCD_POWER; 47 } 48 } 49 return 0; 50 } 51 52 static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value) 53 { 54 if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) { 55 omap_writeb(value, OMAP_PWL_ENABLE); 56 ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST; 57 ams_delta_lcd |= value; 58 } 59 return 0; 60 } 61 62 #ifdef CONFIG_LCD_CLASS_DEVICE 63 static int ams_delta_lcd_get_power(struct lcd_device *dev) 64 { 65 if (ams_delta_lcd & AMS_DELTA_LCD_POWER) 66 return FB_BLANK_UNBLANK; 67 else 68 return FB_BLANK_POWERDOWN; 69 } 70 71 static int ams_delta_lcd_get_contrast(struct lcd_device *dev) 72 { 73 if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) 74 return 0; 75 76 return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST; 77 } 78 79 static struct lcd_ops ams_delta_lcd_ops = { 80 .get_power = ams_delta_lcd_get_power, 81 .set_power = ams_delta_lcd_set_power, 82 .get_contrast = ams_delta_lcd_get_contrast, 83 .set_contrast = ams_delta_lcd_set_contrast, 84 }; 85 #endif 86 87 88 /* omapfb panel section */ 89 90 static int ams_delta_panel_enable(struct lcd_panel *panel) 91 { 92 gpiod_set_value(gpiod_ndisp, 1); 93 gpiod_set_value(gpiod_vblen, 1); 94 return 0; 95 } 96 97 static void ams_delta_panel_disable(struct lcd_panel *panel) 98 { 99 gpiod_set_value(gpiod_vblen, 0); 100 gpiod_set_value(gpiod_ndisp, 0); 101 } 102 103 static struct lcd_panel ams_delta_panel = { 104 .name = "ams-delta", 105 .config = 0, 106 107 .bpp = 12, 108 .data_lines = 16, 109 .x_res = 480, 110 .y_res = 320, 111 .pixel_clock = 4687, 112 .hsw = 3, 113 .hfp = 1, 114 .hbp = 1, 115 .vsw = 1, 116 .vfp = 0, 117 .vbp = 0, 118 .pcd = 0, 119 .acb = 37, 120 121 .enable = ams_delta_panel_enable, 122 .disable = ams_delta_panel_disable, 123 }; 124 125 126 /* platform driver section */ 127 128 static int ams_delta_panel_probe(struct platform_device *pdev) 129 { 130 struct lcd_device *lcd_device = NULL; 131 132 gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW); 133 if (IS_ERR(gpiod_vblen)) 134 return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_vblen), 135 "VBLEN GPIO request failed\n"); 136 137 gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW); 138 if (IS_ERR(gpiod_ndisp)) 139 return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_ndisp), 140 "NDISP GPIO request failed\n"); 141 142 #ifdef CONFIG_LCD_CLASS_DEVICE 143 lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL, 144 &ams_delta_lcd_ops); 145 146 if (IS_ERR(lcd_device)) { 147 int ret = PTR_ERR(lcd_device); 148 149 dev_err(&pdev->dev, "failed to register device\n"); 150 return ret; 151 } 152 153 platform_set_drvdata(pdev, lcd_device); 154 lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST; 155 #endif 156 157 ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST); 158 ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK); 159 160 omapfb_register_panel(&ams_delta_panel); 161 return 0; 162 } 163 164 static struct platform_driver ams_delta_panel_driver = { 165 .probe = ams_delta_panel_probe, 166 .driver = { 167 .name = "lcd_ams_delta", 168 }, 169 }; 170 171 module_platform_driver(ams_delta_panel_driver); 172 173 MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>"); 174 MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone"); 175 MODULE_LICENSE("GPL"); 176