text: // SPDX-License-Identifier: GPL-2.0-only
  /* drivers/video/backlight/vgg2432a4.c
   *
   * VGG2432A4 (ILI9320) LCD controller driver.
   *
   * Copyright 2007 Simtec Electronics
   *	http://armlinux.simtec.co.uk/
   *	Ben Dooks <ben@simtec.co.uk>
  */
  
  #include <linux/delay.h>
  #include <linux/err.h>
  #include <linux/fb.h>
  #include <linux/init.h>
  #include <linux/lcd.h>
  #include <linux/module.h>
  
  #include <linux/spi/spi.h>
  
  #include <video/ili9320.h>
  
  #include "ili9320.h"
  
  /* Device initialisation sequences */
  
  static const struct ili9320_reg vgg_init1[] = {
  	{
  		.address = ILI9320_POWER1,
  		.value	 = ILI9320_POWER1_AP(0) | ILI9320_POWER1_BT(0),
  	}, {
  		.address = ILI9320_POWER2,
  		.value	 = (ILI9320_POWER2_VC(7) |
  			    ILI9320_POWER2_DC0(0) | ILI9320_POWER2_DC1(0)),
  	}, {
  		.address = ILI9320_POWER3,
  		.value	 = ILI9320_POWER3_VRH(0),
  	}, {
  		.address = ILI9320_POWER4,
  		.value	 = ILI9320_POWER4_VREOUT(0),
  	},
  };
  
  static const struct ili9320_reg vgg_init2[] = {
  	{
  		.address = ILI9320_POWER1,
  		.value   = (ILI9320_POWER1_AP(3) | ILI9320_POWER1_APE |
  			    ILI9320_POWER1_BT(7) | ILI9320_POWER1_SAP),
  	}, {
  		.address = ILI9320_POWER2,
  		.value   = ILI9320_POWER2_VC(7) | ILI9320_POWER2_DC0(3),
  	}
  };
  
  static const struct ili9320_reg vgg_gamma[] = {
  	{
  		.address = ILI9320_GAMMA1,
  		.value	 = 0x0000,
  	}, {
  		.address = ILI9320_GAMMA2,
  		.value   = 0x0505,
  	}, {
  		.address = ILI9320_GAMMA3,
  		.value	 = 0x0004,
  	}, {
  		.address = ILI9320_GAMMA4,
  		.value	 = 0x0006,
  	}, {
  		.address = ILI9320_GAMMA5,
  		.value	 = 0x0707,
  	}, {
  		.address = ILI9320_GAMMA6,
  		.value	 = 0x0105,
  	}, {
  		.address = ILI9320_GAMMA7,
  		.value	 = 0x0002,
  	}, {
  		.address = ILI9320_GAMMA8,
  		.value	 = 0x0707,
  	}, {
  		.address = ILI9320_GAMMA9,
  		.value	 = 0x0704,
  	}, {
  		.address = ILI9320_GAMMA10,
  		.value	 = 0x807,
  	}
  
  };
  
  static const struct ili9320_reg vgg_init0[] = {
  	[0]	= {
  		/* set direction and scan mode gate */
  		.address = ILI9320_DRIVER,
  		.value	 = ILI9320_DRIVER_SS,
  	}, {
  		.address = ILI9320_DRIVEWAVE,
  		.value	 = (ILI9320_DRIVEWAVE_MUSTSET |
  			    ILI9320_DRIVEWAVE_EOR | ILI9320_DRIVEWAVE_BC),
  	}, {
  		.address = ILI9320_ENTRYMODE,
  		.value	 = ILI9320_ENTRYMODE_ID(3) | ILI9320_ENTRYMODE_BGR,
  	}, {
  		.address = ILI9320_RESIZING,
  		.value	 = 0x0,
  	},
  };
  
  
  static int vgg2432a4_lcd_init(struct ili9320 *lcd,
  			      struct ili9320_platdata *cfg)
  {
  	unsigned int addr;
  	int ret;
  
  	/* Set VCore before anything else (VGG243237-6UFLWA) */
  	ret = ili9320_write(lcd, 0x00e5, 0x8000);
  	if (ret)
  		goto err_initial;
  
  	/* Start the oscillator up before we can do anything else. */
  	ret = ili9320_write(lcd, ILI9320_OSCILATION, ILI9320_OSCILATION_OSC);
  	if (ret)
  		goto err_initial;
  
  	/* must wait at-lesat 10ms after starting */
  	mdelay(15);
  
  	ret = ili9320_write_regs(lcd, vgg_init0, ARRAY_SIZE(vgg_init0));
  	if (ret != 0)
  		goto err_initial;
  
  	ili9320_write(lcd, ILI9320_DISPLAY2, cfg->display2);
  	ili9320_write(lcd, ILI9320_DISPLAY3, cfg->display3);
  	ili9320_write(lcd, ILI9320_DISPLAY4, cfg->display4);
  
  	ili9320_write(lcd, ILI9320_RGB_IF1, cfg->rgb_if1);
  	ili9320_write(lcd, ILI9320_FRAMEMAKER, 0x0);
  	ili9320_write(lcd, ILI9320_RGB_IF2, cfg->rgb_if2);
  
  	ret = ili9320_write_regs(lcd, vgg_init1, ARRAY_SIZE(vgg_init1));
  	if (ret != 0)
  		goto err_vgg;
  
  	mdelay(300);
  
  	ret = ili9320_write_regs(lcd, vgg_init2, ARRAY_SIZE(vgg_init2));
  	if (ret != 0)
  		goto err_vgg2;
  
  	mdelay(100);
  
  	ili9320_write(lcd, ILI9320_POWER3, 0x13c);
  
  	mdelay(100);
  
  	ili9320_write(lcd, ILI9320_POWER4, 0x1c00);
  	ili9320_write(lcd, ILI9320_POWER7, 0x000e);
  
  	mdelay(100);
  
  	ili9320_write(lcd, ILI9320_GRAM_HORIZ_ADDR, 0x00);
  	ili9320_write(lcd, ILI9320_GRAM_VERT_ADD, 0x00);
  
  	ret = ili9320_write_regs(lcd, vgg_gamma, ARRAY_SIZE(vgg_gamma));
  	if (ret != 0)
  		goto err_vgg3;
  
  	ili9320_write(lcd, ILI9320_HORIZ_START, 0x0);
  	ili9320_write(lcd, ILI9320_HORIZ_END, cfg->hsize - 1);
  	ili9320_write(lcd, ILI9320_VERT_START, 0x0);
  	ili9320_write(lcd, ILI9320_VERT_END, cfg->vsize - 1);
  
  	ili9320_write(lcd, ILI9320_DRIVER2,
  		      ILI9320_DRIVER2_NL(((cfg->vsize - 240) / 8) + 0x1D));
  
  	ili9320_write(lcd, ILI9320_BASE_IMAGE, 0x1);
  	ili9320_write(lcd, ILI9320_VERT_SCROLL, 0x00);
  
  	for (addr = ILI9320_PARTIAL1_POSITION; addr <= ILI9320_PARTIAL2_END;
  	     addr++) {
  		ili9320_write(lcd, addr, 0x0);
  	}
  
  	ili9320_write(lcd, ILI9320_INTERFACE1, 0x10);
  	ili9320_write(lcd, ILI9320_INTERFACE2, cfg->interface2);
  	ili9320_write(lcd, ILI9320_INTERFACE3, cfg->interface3);
  	ili9320_write(lcd, ILI9320_INTERFACE4, cfg->interface4);
  	ili9320_write(lcd, ILI9320_INTERFACE5, cfg->interface5);
  	ili9320_write(lcd, ILI9320_INTERFACE6, cfg->interface6);
  
  	lcd->display1 = (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_DTE |
  			 ILI9320_DISPLAY1_GON | ILI9320_DISPLAY1_BASEE |
  			 0x40);
  
  	ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
  
  	return 0;
  
   err_vgg3:
   err_vgg2:
   err_vgg:
   err_initial:
  	return ret;
  }
  
  #ifdef CONFIG_PM_SLEEP
  static int vgg2432a4_suspend(struct device *dev)
  {
  	return ili9320_suspend(dev_get_drvdata(dev));
  }
  static int vgg2432a4_resume(struct device *dev)
  {
  	return ili9320_resume(dev_get_drvdata(dev));
  }
  #endif
  
  static struct ili9320_client vgg2432a4_client = {
  	.name	= "VGG2432A4",
  	.init	= vgg2432a4_lcd_init,
  };
  
  /* Device probe */
  
  static int vgg2432a4_probe(struct spi_device *spi)
  {
  	int ret;
  
  	ret = ili9320_probe_spi(spi, &vgg2432a4_client);
  	if (ret != 0) {
  		dev_err(&spi->dev, "failed to initialise ili9320\n");
  		return ret;
  	}
  
  	return 0;
  }
  
  static int vgg2432a4_remove(struct spi_device *spi)
  {
  	ili9320_remove(spi_get_drvdata(spi));
  
  	return 0;
  }
  
  static void vgg2432a4_shutdown(struct spi_device *spi)
  {
  	ili9320_shutdown(spi_get_drvdata(spi));
  }
  
  static SIMPLE_DEV_PM_OPS(vgg2432a4_pm_ops, vgg2432a4_suspend, vgg2432a4_resume);
  
  static struct spi_driver vgg2432a4_driver = {
  	.driver = {
  		.name		= "VGG2432A4",
  		.pm		= &vgg2432a4_pm_ops,
  	},
  	.probe		= vgg2432a4_probe,
  	.remove		= vgg2432a4_remove,
  	.shutdown	= vgg2432a4_shutdown,
  };
  
  module_spi_driver(vgg2432a4_driver);
  
  MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
  MODULE_DESCRIPTION("VGG2432A4 LCD Driver");
  MODULE_LICENSE("GPL v2");
  MODULE_ALIAS("spi:VGG2432A4");
  