drivers/video/omap/lcd_ams_delta.c

   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 unsigned long ams_delta_panel_get_caps(struct lcd_panel *panel)
 140 {
 141         return 0;
 142 }
 143
 144 static struct lcd_panel ams_delta_panel = {
 145         .name           = "ams-delta",
 146         .config         = 0,
 147
 148         .bpp            = 12,
 149         .data_lines     = 16,
 150         .x_res          = 480,
 151         .y_res          = 320,
 152         .pixel_clock    = 4687,
 153         .hsw            = 3,
 154         .hfp            = 1,
 155         .hbp            = 1,
 156         .vsw            = 1,
 157         .vfp            = 0,
 158         .vbp            = 0,
 159         .pcd            = 0,
 160         .acb            = 37,
 161
 162         .init           = ams_delta_panel_init,
 163         .cleanup        = ams_delta_panel_cleanup,
 164         .enable         = ams_delta_panel_enable,
 165         .disable        = ams_delta_panel_disable,
 166         .get_caps       = ams_delta_panel_get_caps,
 167 };
 168
 169
 170 /* platform driver section */
 171
 172 static int ams_delta_panel_probe(struct platform_device *pdev)
 173 {
 174         struct lcd_device *lcd_device = NULL;
 175 #ifdef CONFIG_LCD_CLASS_DEVICE
 176         int ret;
 177
 178         lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
 179                                                 &ams_delta_lcd_ops);
 180
 181         if (IS_ERR(lcd_device)) {
 182                 ret = PTR_ERR(lcd_device);
 183                 dev_err(&pdev->dev, "failed to register device\n");
 184                 return ret;
 185         }
 186
 187         platform_set_drvdata(pdev, lcd_device);
 188         lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
 189 #endif
 190
 191         ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
 192         ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
 193
 194         omapfb_register_panel(&ams_delta_panel);
 195         return 0;
 196 }
 197
 198 static int ams_delta_panel_remove(struct platform_device *pdev)
 199 {
 200         return 0;
 201 }
 202
 203 static int ams_delta_panel_suspend(struct platform_device *pdev,
 204                 pm_message_t mesg)
 205 {
 206         return 0;
 207 }
 208
 209 static int ams_delta_panel_resume(struct platform_device *pdev)
 210 {
 211         return 0;
 212 }
 213
 214 static struct platform_driver ams_delta_panel_driver = {
 215         .probe          = ams_delta_panel_probe,
 216         .remove         = ams_delta_panel_remove,
 217         .suspend        = ams_delta_panel_suspend,
 218         .resume         = ams_delta_panel_resume,
 219         .driver         = {
 220                 .name   = "lcd_ams_delta",
 221                 .owner  = THIS_MODULE,
 222         },
 223 };
 224
 225 module_platform_driver(ams_delta_panel_driver);