text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * Backlight control code for Sharp Zaurus SL-5500
   *
   * Copyright 2005 John Lenz <lenz@cs.wisc.edu>
   * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-)
   *
   * This driver assumes single CPU. That's okay, because collie is
   * slightly old hardware, and no one is going to retrofit second CPU to
   * old PDA.
   */
  
  /* LCD power functions */
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/delay.h>
  #include <linux/device.h>
  #include <linux/interrupt.h>
  #include <linux/fb.h>
  #include <linux/backlight.h>
  
  #include <asm/hardware/locomo.h>
  #include <asm/irq.h>
  #include <asm/mach/sharpsl_param.h>
  #include <asm/mach-types.h>
  
  #include "../../../arch/arm/mach-sa1100/generic.h"
  
  static struct backlight_device *locomolcd_bl_device;
  static struct locomo_dev *locomolcd_dev;
  static unsigned long locomolcd_flags;
  #define LOCOMOLCD_SUSPENDED     0x01
  
  static void locomolcd_on(int comadj)
  {
  	locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
  	locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 1);
  	mdelay(2);
  
  	locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
  	locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 1);
  	mdelay(2);
  
  	locomo_m62332_senddata(locomolcd_dev, comadj, 0);
  	mdelay(5);
  
  	locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
  	locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 1);
  	mdelay(10);
  
  	/* TFTCRST | CPSOUT=0 | CPSEN */
  	locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);
  
  	/* Set CPSD */
  	locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);
  
  	/* TFTCRST | CPSOUT=0 | CPSEN */
  	locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);
  	mdelay(10);
  
  	locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
  	locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 1);
  }
  
  static void locomolcd_off(int comadj)
  {
  	/* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
  	locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);
  	mdelay(1);
  
  	locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
  	mdelay(110);
  
  	locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
  	mdelay(700);
  
  	/* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
  	locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC);
  	locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
  	locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
  }
  
  void locomolcd_power(int on)
  {
  	int comadj = sharpsl_param.comadj;
  	unsigned long flags;
  
  	local_irq_save(flags);
  
  	if (!locomolcd_dev) {
  		local_irq_restore(flags);
  		return;
  	}
  
  	/* read comadj */
  	if (comadj == -1 && machine_is_collie())
  		comadj = 128;
  	if (comadj == -1 && machine_is_poodle())
  		comadj = 118;
  
  	if (on)
  		locomolcd_on(comadj);
  	else
  		locomolcd_off(comadj);
  
  	local_irq_restore(flags);
  }
  EXPORT_SYMBOL(locomolcd_power);
  
  static int current_intensity;
  
  static int locomolcd_set_intensity(struct backlight_device *bd)
  {
  	int intensity = bd->props.brightness;
  
  	if (bd->props.power != FB_BLANK_UNBLANK)
  		intensity = 0;
  	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
  		intensity = 0;
  	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
  		intensity = 0;
  
  	switch (intensity) {
  	/*
  	 * AC and non-AC are handled differently,
  	 * but produce same results in sharp code?
  	 */
  	case 0:
  		locomo_frontlight_set(locomolcd_dev, 0, 0, 161);
  		break;
  	case 1:
  		locomo_frontlight_set(locomolcd_dev, 117, 0, 161);
  		break;
  	case 2:
  		locomo_frontlight_set(locomolcd_dev, 163, 0, 148);
  		break;
  	case 3:
  		locomo_frontlight_set(locomolcd_dev, 194, 0, 161);
  		break;
  	case 4:
  		locomo_frontlight_set(locomolcd_dev, 194, 1, 161);
  		break;
  	default:
  		return -ENODEV;
  	}
  	current_intensity = intensity;
  	return 0;
  }
  
  static int locomolcd_get_intensity(struct backlight_device *bd)
  {
  	return current_intensity;
  }
  
  static const struct backlight_ops locomobl_data = {
  	.get_brightness = locomolcd_get_intensity,
  	.update_status  = locomolcd_set_intensity,
  };
  
  #ifdef CONFIG_PM_SLEEP
  static int locomolcd_suspend(struct device *dev)
  {
  	locomolcd_flags |= LOCOMOLCD_SUSPENDED;
  	locomolcd_set_intensity(locomolcd_bl_device);
  	return 0;
  }
  
  static int locomolcd_resume(struct device *dev)
  {
  	locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
  	locomolcd_set_intensity(locomolcd_bl_device);
  	return 0;
  }
  #endif
  
  static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
  
  static int locomolcd_probe(struct locomo_dev *ldev)
  {
  	struct backlight_properties props;
  	unsigned long flags;
  
  	local_irq_save(flags);
  	locomolcd_dev = ldev;
  
  	locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
  
  	/*
  	 * the poodle_lcd_power function is called for the first time
  	 * from fs_initcall, which is before locomo is activated.
  	 * We need to recall poodle_lcd_power here
  	 */
  	if (machine_is_poodle())
  		locomolcd_power(1);
  
  	local_irq_restore(flags);
  
  	memset(&props, 0, sizeof(struct backlight_properties));
  	props.type = BACKLIGHT_RAW;
  	props.max_brightness = 4;
  	locomolcd_bl_device = backlight_device_register("locomo-bl",
  							&ldev->dev, NULL,
  							&locomobl_data, &props);
  
  	if (IS_ERR(locomolcd_bl_device))
  		return PTR_ERR(locomolcd_bl_device);
  
  	/* Set up frontlight so that screen is readable */
  	locomolcd_bl_device->props.brightness = 2;
  	locomolcd_set_intensity(locomolcd_bl_device);
  
  	return 0;
  }
  
  static int locomolcd_remove(struct locomo_dev *dev)
  {
  	unsigned long flags;
  
  	locomolcd_bl_device->props.brightness = 0;
  	locomolcd_bl_device->props.power = 0;
  	locomolcd_set_intensity(locomolcd_bl_device);
  
  	backlight_device_unregister(locomolcd_bl_device);
  	local_irq_save(flags);
  	locomolcd_dev = NULL;
  	local_irq_restore(flags);
  	return 0;
  }
  
  static struct locomo_driver poodle_lcd_driver = {
  	.drv = {
  		.name	= "locomo-backlight",
  		.pm	= &locomolcd_pm_ops,
  	},
  	.devid	= LOCOMO_DEVID_BACKLIGHT,
  	.probe	= locomolcd_probe,
  	.remove	= locomolcd_remove,
  };
  
  static int __init locomolcd_init(void)
  {
  	return locomo_driver_register(&poodle_lcd_driver);
  }
  
  static void __exit locomolcd_exit(void)
  {
  	locomo_driver_unregister(&poodle_lcd_driver);
  }
  
  module_init(locomolcd_init);
  module_exit(locomolcd_exit);
  
  MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
  MODULE_DESCRIPTION("Collie LCD driver");
  MODULE_LICENSE("GPL");
  