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/lcd.h> 28 #include <linux/gpio.h> 29 30 #include <mach/hardware.h> 31 #include <mach/board-ams-delta.h> 32 33 #include "omapfb.h" 34 35 #define AMS_DELTA_DEFAULT_CONTRAST 112 36 37 #define AMS_DELTA_MAX_CONTRAST 0x00FF 38 #define AMS_DELTA_LCD_POWER 0x0100 39 40 41 /* LCD class device section */ 42 43 static int ams_delta_lcd; 44 45 static int ams_delta_lcd_set_power(struct lcd_device *dev, int power) 46 { 47 if (power == FB_BLANK_UNBLANK) { 48 if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) { 49 omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST, 50 OMAP_PWL_ENABLE); 51 omap_writeb(1, OMAP_PWL_CLK_ENABLE); 52 ams_delta_lcd |= AMS_DELTA_LCD_POWER; 53 } 54 } else { 55 if (ams_delta_lcd & AMS_DELTA_LCD_POWER) { 56 omap_writeb(0, OMAP_PWL_ENABLE); 57 omap_writeb(0, OMAP_PWL_CLK_ENABLE); 58 ams_delta_lcd &= ~AMS_DELTA_LCD_POWER; 59 } 60 } 61 return 0; 62 } 63 64 static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value) 65 { 66 if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) { 67 omap_writeb(value, OMAP_PWL_ENABLE); 68 ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST; 69 ams_delta_lcd |= value; 70 } 71 return 0; 72 } 73 74 #ifdef CONFIG_LCD_CLASS_DEVICE 75 static int ams_delta_lcd_get_power(struct lcd_device *dev) 76 { 77 if (ams_delta_lcd & AMS_DELTA_LCD_POWER) 78 return FB_BLANK_UNBLANK; 79 else 80 return FB_BLANK_POWERDOWN; 81 } 82 83 static int ams_delta_lcd_get_contrast(struct lcd_device *dev) 84 { 85 if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) 86 return 0; 87 88 return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST; 89 } 90 91 static struct lcd_ops ams_delta_lcd_ops = { 92 .get_power = ams_delta_lcd_get_power, 93 .set_power = ams_delta_lcd_set_power, 94 .get_contrast = ams_delta_lcd_get_contrast, 95 .set_contrast = ams_delta_lcd_set_contrast, 96 }; 97 #endif 98 99 100 /* omapfb panel section */ 101 102 static const struct gpio _gpios[] = { 103 { 104 .gpio = AMS_DELTA_GPIO_PIN_LCD_VBLEN, 105 .flags = GPIOF_OUT_INIT_LOW, 106 .label = "lcd_vblen", 107 }, 108 { 109 .gpio = AMS_DELTA_GPIO_PIN_LCD_NDISP, 110 .flags = GPIOF_OUT_INIT_LOW, 111 .label = "lcd_ndisp", 112 }, 113 }; 114 115 static int ams_delta_panel_init(struct lcd_panel *panel, 116 struct omapfb_device *fbdev) 117 { 118 return gpio_request_array(_gpios, ARRAY_SIZE(_gpios)); 119 } 120 121 static void ams_delta_panel_cleanup(struct lcd_panel *panel) 122 { 123 gpio_free_array(_gpios, ARRAY_SIZE(_gpios)); 124 } 125 126 static int ams_delta_panel_enable(struct lcd_panel *panel) 127 { 128 gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 1); 129 gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 1); 130 return 0; 131 } 132 133 static void ams_delta_panel_disable(struct lcd_panel *panel) 134 { 135 gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 0); 136 gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 0); 137 } 138 139 static struct lcd_panel ams_delta_panel = { 140 .name = "ams-delta", 141 .config = 0, 142 143 .bpp = 12, 144 .data_lines = 16, 145 .x_res = 480, 146 .y_res = 320, 147 .pixel_clock = 4687, 148 .hsw = 3, 149 .hfp = 1, 150 .hbp = 1, 151 .vsw = 1, 152 .vfp = 0, 153 .vbp = 0, 154 .pcd = 0, 155 .acb = 37, 156 157 .init = ams_delta_panel_init, 158 .cleanup = ams_delta_panel_cleanup, 159 .enable = ams_delta_panel_enable, 160 .disable = ams_delta_panel_disable, 161 }; 162 163 164 /* platform driver section */ 165 166 static int ams_delta_panel_probe(struct platform_device *pdev) 167 { 168 struct lcd_device *lcd_device = NULL; 169 #ifdef CONFIG_LCD_CLASS_DEVICE 170 int ret; 171 172 lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL, 173 &ams_delta_lcd_ops); 174 175 if (IS_ERR(lcd_device)) { 176 ret = PTR_ERR(lcd_device); 177 dev_err(&pdev->dev, "failed to register device\n"); 178 return ret; 179 } 180 181 platform_set_drvdata(pdev, lcd_device); 182 lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST; 183 #endif 184 185 ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST); 186 ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK); 187 188 omapfb_register_panel(&ams_delta_panel); 189 return 0; 190 } 191 192 static struct platform_driver ams_delta_panel_driver = { 193 .probe = ams_delta_panel_probe, 194 .driver = { 195 .name = "lcd_ams_delta", 196 }, 197 }; 198 199 module_platform_driver(ams_delta_panel_driver); 200 201 MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>"); 202 MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone"); 203 MODULE_LICENSE("GPL"); 204