text: /*
   * Based on drivers/video/omap/lcd_inn1510.c
   *
   * LCD panel support for the Amstrad E3 (Delta) videophone.
   *
   * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License as published by the
   * Free Software Foundation; either version 2 of the License, or (at your
   * option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License along
   * with this program; if not, write to the Free Software Foundation, Inc.,
   * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
   */
  
  #include <linux/module.h>
  #include <linux/platform_device.h>
  #include <linux/io.h>
  #include <linux/delay.h>
  #include <linux/gpio/consumer.h>
  #include <linux/lcd.h>
  
  #include <mach/hardware.h>
  
  #include "omapfb.h"
  
  #define AMS_DELTA_DEFAULT_CONTRAST	112
  
  #define AMS_DELTA_MAX_CONTRAST		0x00FF
  #define AMS_DELTA_LCD_POWER		0x0100
  
  
  /* LCD class device section */
  
  static int ams_delta_lcd;
  static struct gpio_desc *gpiod_vblen;
  static struct gpio_desc *gpiod_ndisp;
  
  static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
  {
  	if (power == FB_BLANK_UNBLANK) {
  		if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) {
  			omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST,
  					OMAP_PWL_ENABLE);
  			omap_writeb(1, OMAP_PWL_CLK_ENABLE);
  			ams_delta_lcd |= AMS_DELTA_LCD_POWER;
  		}
  	} else {
  		if (ams_delta_lcd & AMS_DELTA_LCD_POWER) {
  			omap_writeb(0, OMAP_PWL_ENABLE);
  			omap_writeb(0, OMAP_PWL_CLK_ENABLE);
  			ams_delta_lcd &= ~AMS_DELTA_LCD_POWER;
  		}
  	}
  	return 0;
  }
  
  static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value)
  {
  	if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) {
  		omap_writeb(value, OMAP_PWL_ENABLE);
  		ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST;
  		ams_delta_lcd |= value;
  	}
  	return 0;
  }
  
  #ifdef CONFIG_LCD_CLASS_DEVICE
  static int ams_delta_lcd_get_power(struct lcd_device *dev)
  {
  	if (ams_delta_lcd & AMS_DELTA_LCD_POWER)
  		return FB_BLANK_UNBLANK;
  	else
  		return FB_BLANK_POWERDOWN;
  }
  
  static int ams_delta_lcd_get_contrast(struct lcd_device *dev)
  {
  	if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER))
  		return 0;
  
  	return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST;
  }
  
  static struct lcd_ops ams_delta_lcd_ops = {
  	.get_power = ams_delta_lcd_get_power,
  	.set_power = ams_delta_lcd_set_power,
  	.get_contrast = ams_delta_lcd_get_contrast,
  	.set_contrast = ams_delta_lcd_set_contrast,
  };
  #endif
  
  
  /* omapfb panel section */
  
  static int ams_delta_panel_enable(struct lcd_panel *panel)
  {
  	gpiod_set_value(gpiod_ndisp, 1);
  	gpiod_set_value(gpiod_vblen, 1);
  	return 0;
  }
  
  static void ams_delta_panel_disable(struct lcd_panel *panel)
  {
  	gpiod_set_value(gpiod_vblen, 0);
  	gpiod_set_value(gpiod_ndisp, 0);
  }
  
  static struct lcd_panel ams_delta_panel = {
  	.name		= "ams-delta",
  	.config		= 0,
  
  	.bpp		= 12,
  	.data_lines	= 16,
  	.x_res		= 480,
  	.y_res		= 320,
  	.pixel_clock	= 4687,
  	.hsw		= 3,
  	.hfp		= 1,
  	.hbp		= 1,
  	.vsw		= 1,
  	.vfp		= 0,
  	.vbp		= 0,
  	.pcd		= 0,
  	.acb		= 37,
  
  	.enable		= ams_delta_panel_enable,
  	.disable	= ams_delta_panel_disable,
  };
  
  
  /* platform driver section */
  
  static int ams_delta_panel_probe(struct platform_device *pdev)
  {
  	struct lcd_device *lcd_device = NULL;
  	int ret;
  
  	gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW);
  	if (IS_ERR(gpiod_vblen)) {
  		ret = PTR_ERR(gpiod_vblen);
  		dev_err(&pdev->dev, "VBLEN GPIO request failed (%d)\n", ret);
  		return ret;
  	}
  
  	gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW);
  	if (IS_ERR(gpiod_ndisp)) {
  		ret = PTR_ERR(gpiod_ndisp);
  		dev_err(&pdev->dev, "NDISP GPIO request failed (%d)\n", ret);
  		return ret;
  	}
  
  #ifdef CONFIG_LCD_CLASS_DEVICE
  	lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
  						&ams_delta_lcd_ops);
  
  	if (IS_ERR(lcd_device)) {
  		ret = PTR_ERR(lcd_device);
  		dev_err(&pdev->dev, "failed to register device\n");
  		return ret;
  	}
  
  	platform_set_drvdata(pdev, lcd_device);
  	lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
  #endif
  
  	ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
  	ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
  
  	omapfb_register_panel(&ams_delta_panel);
  	return 0;
  }
  
  static struct platform_driver ams_delta_panel_driver = {
  	.probe		= ams_delta_panel_probe,
  	.driver		= {
  		.name	= "lcd_ams_delta",
  	},
  };
  
  module_platform_driver(ams_delta_panel_driver);
  
  MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
  MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone");
  MODULE_LICENSE("GPL");
  