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/board-ams-delta.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
  44 static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
  45 {
  46         if (power == FB_BLANK_UNBLANK) {
  47                 if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) {
  48                         omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST,
  49                                         OMAP_PWL_ENABLE);
  50                         omap_writeb(1, OMAP_PWL_CLK_ENABLE);
  51                         ams_delta_lcd |= AMS_DELTA_LCD_POWER;
  52                 }
  53         } else {
  54                 if (ams_delta_lcd & AMS_DELTA_LCD_POWER) {
  55                         omap_writeb(0, OMAP_PWL_ENABLE);
  56                         omap_writeb(0, OMAP_PWL_CLK_ENABLE);
  57                         ams_delta_lcd &= ~AMS_DELTA_LCD_POWER;
  58                 }
  59         }
  60         return 0;
  61 }
  62
  63 static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value)
  64 {
  65         if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) {
  66                 omap_writeb(value, OMAP_PWL_ENABLE);
  67                 ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST;
  68                 ams_delta_lcd |= value;
  69         }
  70         return 0;
  71 }
  72
  73 #ifdef CONFIG_LCD_CLASS_DEVICE
  74 static int ams_delta_lcd_get_power(struct lcd_device *dev)
  75 {
  76         if (ams_delta_lcd & AMS_DELTA_LCD_POWER)
  77                 return FB_BLANK_UNBLANK;
  78         else
  79                 return FB_BLANK_POWERDOWN;
  80 }
  81
  82 static int ams_delta_lcd_get_contrast(struct lcd_device *dev)
  83 {
  84         if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER))
  85                 return 0;
  86
  87         return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST;
  88 }
  89
  90 static struct lcd_ops ams_delta_lcd_ops = {
  91         .get_power = ams_delta_lcd_get_power,
  92         .set_power = ams_delta_lcd_set_power,
  93         .get_contrast = ams_delta_lcd_get_contrast,
  94         .set_contrast = ams_delta_lcd_set_contrast,
  95 };
  96 #endif
  97
  98
  99 /* omapfb panel section */
 100
 101 static const struct gpio _gpios[] = {
 102         {
 103                 .gpio   = AMS_DELTA_GPIO_PIN_LCD_VBLEN,
 104                 .flags  = GPIOF_OUT_INIT_LOW,
 105                 .label  = "lcd_vblen",
 106         },
 107         {
 108                 .gpio   = AMS_DELTA_GPIO_PIN_LCD_NDISP,
 109                 .flags  = GPIOF_OUT_INIT_LOW,
 110                 .label  = "lcd_ndisp",
 111         },
 112 };
 113
 114 static int ams_delta_panel_init(struct lcd_panel *panel,
 115                 struct omapfb_device *fbdev)
 116 {
 117         return gpio_request_array(_gpios, ARRAY_SIZE(_gpios));
 118 }
 119
 120 static void ams_delta_panel_cleanup(struct lcd_panel *panel)
 121 {
 122         gpio_free_array(_gpios, ARRAY_SIZE(_gpios));
 123 }
 124
 125 static int ams_delta_panel_enable(struct lcd_panel *panel)
 126 {
 127         gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 1);
 128         gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 1);
 129         return 0;
 130 }
 131
 132 static void ams_delta_panel_disable(struct lcd_panel *panel)
 133 {
 134         gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 0);
 135         gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 0);
 136 }
 137
 138 static unsigned long ams_delta_panel_get_caps(struct lcd_panel *panel)
 139 {
 140         return 0;
 141 }
 142
 143 static struct lcd_panel ams_delta_panel = {
 144         .name           = "ams-delta",
 145         .config         = 0,
 146
 147         .bpp            = 12,
 148         .data_lines     = 16,
 149         .x_res          = 480,
 150         .y_res          = 320,
 151         .pixel_clock    = 4687,
 152         .hsw            = 3,
 153         .hfp            = 1,
 154         .hbp            = 1,
 155         .vsw            = 1,
 156         .vfp            = 0,
 157         .vbp            = 0,
 158         .pcd            = 0,
 159         .acb            = 37,
 160
 161         .init           = ams_delta_panel_init,
 162         .cleanup        = ams_delta_panel_cleanup,
 163         .enable         = ams_delta_panel_enable,
 164         .disable        = ams_delta_panel_disable,
 165         .get_caps       = ams_delta_panel_get_caps,
 166 };
 167
 168
 169 /* platform driver section */
 170
 171 static int ams_delta_panel_probe(struct platform_device *pdev)
 172 {
 173         struct lcd_device *lcd_device = NULL;
 174 #ifdef CONFIG_LCD_CLASS_DEVICE
 175         int ret;
 176
 177         lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
 178                                                 &ams_delta_lcd_ops);
 179
 180         if (IS_ERR(lcd_device)) {
 181                 ret = PTR_ERR(lcd_device);
 182                 dev_err(&pdev->dev, "failed to register device\n");
 183                 return ret;
 184         }
 185
 186         platform_set_drvdata(pdev, lcd_device);
 187         lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
 188 #endif
 189
 190         ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
 191         ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
 192
 193         omapfb_register_panel(&ams_delta_panel);
 194         return 0;
 195 }
 196
 197 static int ams_delta_panel_remove(struct platform_device *pdev)
 198 {
 199         return 0;
 200 }
 201
 202 static int ams_delta_panel_suspend(struct platform_device *pdev,
 203                 pm_message_t mesg)
 204 {
 205         return 0;
 206 }
 207
 208 static int ams_delta_panel_resume(struct platform_device *pdev)
 209 {
 210         return 0;
 211 }
 212
 213 static struct platform_driver ams_delta_panel_driver = {
 214         .probe          = ams_delta_panel_probe,
 215         .remove         = ams_delta_panel_remove,
 216         .suspend        = ams_delta_panel_suspend,
 217         .resume         = ams_delta_panel_resume,
 218         .driver         = {
 219                 .name   = "lcd_ams_delta",
 220                 .owner  = THIS_MODULE,
 221         },
 222 };
 223
 224 module_platform_driver(ams_delta_panel_driver);