1 /* 2 * Based on drivers/video/omap/lcd_inn1510.c 3 * 4 * LCD panel support for the Amstrad E3 (Delta) videophone. 5 * 6 * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, write to the Free Software Foundation, Inc., 20 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21 */ 22 23 #include <linux/module.h> 24 #include <linux/platform_device.h> 25 #include <linux/io.h> 26 #include <linux/delay.h> 27 #include <linux/gpio/consumer.h> 28 #include <linux/lcd.h> 29 30 #include <mach/hardware.h> 31 32 #include "omapfb.h" 33 34 #define AMS_DELTA_DEFAULT_CONTRAST 112 35 36 #define AMS_DELTA_MAX_CONTRAST 0x00FF 37 #define AMS_DELTA_LCD_POWER 0x0100 38 39 40 /* LCD class device section */ 41 42 static int ams_delta_lcd; 43 static struct gpio_desc *gpiod_vblen; 44 static struct gpio_desc *gpiod_ndisp; 45 46 static int ams_delta_lcd_set_power(struct lcd_device *dev, int power) 47 { 48 if (power == FB_BLANK_UNBLANK) { 49 if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) { 50 omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST, 51 OMAP_PWL_ENABLE); 52 omap_writeb(1, OMAP_PWL_CLK_ENABLE); 53 ams_delta_lcd |= AMS_DELTA_LCD_POWER; 54 } 55 } else { 56 if (ams_delta_lcd & AMS_DELTA_LCD_POWER) { 57 omap_writeb(0, OMAP_PWL_ENABLE); 58 omap_writeb(0, OMAP_PWL_CLK_ENABLE); 59 ams_delta_lcd &= ~AMS_DELTA_LCD_POWER; 60 } 61 } 62 return 0; 63 } 64 65 static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value) 66 { 67 if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) { 68 omap_writeb(value, OMAP_PWL_ENABLE); 69 ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST; 70 ams_delta_lcd |= value; 71 } 72 return 0; 73 } 74 75 #ifdef CONFIG_LCD_CLASS_DEVICE 76 static int ams_delta_lcd_get_power(struct lcd_device *dev) 77 { 78 if (ams_delta_lcd & AMS_DELTA_LCD_POWER) 79 return FB_BLANK_UNBLANK; 80 else 81 return FB_BLANK_POWERDOWN; 82 } 83 84 static int ams_delta_lcd_get_contrast(struct lcd_device *dev) 85 { 86 if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) 87 return 0; 88 89 return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST; 90 } 91 92 static struct lcd_ops ams_delta_lcd_ops = { 93 .get_power = ams_delta_lcd_get_power, 94 .set_power = ams_delta_lcd_set_power, 95 .get_contrast = ams_delta_lcd_get_contrast, 96 .set_contrast = ams_delta_lcd_set_contrast, 97 }; 98 #endif 99 100 101 /* omapfb panel section */ 102 103 static int ams_delta_panel_enable(struct lcd_panel *panel) 104 { 105 gpiod_set_value(gpiod_ndisp, 1); 106 gpiod_set_value(gpiod_vblen, 1); 107 return 0; 108 } 109 110 static void ams_delta_panel_disable(struct lcd_panel *panel) 111 { 112 gpiod_set_value(gpiod_vblen, 0); 113 gpiod_set_value(gpiod_ndisp, 0); 114 } 115 116 static struct lcd_panel ams_delta_panel = { 117 .name = "ams-delta", 118 .config = 0, 119 120 .bpp = 12, 121 .data_lines = 16, 122 .x_res = 480, 123 .y_res = 320, 124 .pixel_clock = 4687, 125 .hsw = 3, 126 .hfp = 1, 127 .hbp = 1, 128 .vsw = 1, 129 .vfp = 0, 130 .vbp = 0, 131 .pcd = 0, 132 .acb = 37, 133 134 .enable = ams_delta_panel_enable, 135 .disable = ams_delta_panel_disable, 136 }; 137 138 139 /* platform driver section */ 140 141 static int ams_delta_panel_probe(struct platform_device *pdev) 142 { 143 struct lcd_device *lcd_device = NULL; 144 int ret; 145 146 gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW); 147 if (IS_ERR(gpiod_vblen)) { 148 ret = PTR_ERR(gpiod_vblen); 149 dev_err(&pdev->dev, "VBLEN GPIO request failed (%d)\n", ret); 150 return ret; 151 } 152 153 gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW); 154 if (IS_ERR(gpiod_ndisp)) { 155 ret = PTR_ERR(gpiod_ndisp); 156 dev_err(&pdev->dev, "NDISP GPIO request failed (%d)\n", ret); 157 return ret; 158 } 159 160 #ifdef CONFIG_LCD_CLASS_DEVICE 161 lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL, 162 &ams_delta_lcd_ops); 163 164 if (IS_ERR(lcd_device)) { 165 ret = PTR_ERR(lcd_device); 166 dev_err(&pdev->dev, "failed to register device\n"); 167 return ret; 168 } 169 170 platform_set_drvdata(pdev, lcd_device); 171 lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST; 172 #endif 173 174 ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST); 175 ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK); 176 177 omapfb_register_panel(&ams_delta_panel); 178 return 0; 179 } 180 181 static struct platform_driver ams_delta_panel_driver = { 182 .probe = ams_delta_panel_probe, 183 .driver = { 184 .name = "lcd_ams_delta", 185 }, 186 }; 187 188 module_platform_driver(ams_delta_panel_driver); 189 190 MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>"); 191 MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone"); 192 MODULE_LICENSE("GPL"); 193