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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Backlight control code for Sharp Zaurus SL-55004 *5 * Copyright 2005 John Lenz <lenz@cs.wisc.edu>6 * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-)7 *8 * This driver assumes single CPU. That's okay, because collie is9 * slightly old hardware, and no one is going to retrofit second CPU to10 * old PDA.11 */12 13/* LCD power functions */14#include <linux/module.h>15#include <linux/init.h>16#include <linux/delay.h>17#include <linux/device.h>18#include <linux/interrupt.h>19#include <linux/fb.h>20#include <linux/backlight.h>21 22#include <asm/hardware/locomo.h>23#include <asm/irq.h>24#include <asm/mach/sharpsl_param.h>25#include <asm/mach-types.h>26 27#include "../../../arch/arm/mach-sa1100/generic.h"28 29static struct backlight_device *locomolcd_bl_device;30static struct locomo_dev *locomolcd_dev;31static unsigned long locomolcd_flags;32#define LOCOMOLCD_SUSPENDED 0x0133 34static void locomolcd_on(int comadj)35{36 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);37 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 1);38 mdelay(2);39 40 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);41 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 1);42 mdelay(2);43 44 locomo_m62332_senddata(locomolcd_dev, comadj, 0);45 mdelay(5);46 47 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);48 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 1);49 mdelay(10);50 51 /* TFTCRST | CPSOUT=0 | CPSEN */52 locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);53 54 /* Set CPSD */55 locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);56 57 /* TFTCRST | CPSOUT=0 | CPSEN */58 locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);59 mdelay(10);60 61 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);62 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 1);63}64 65static void locomolcd_off(int comadj)66{67 /* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */68 locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);69 mdelay(1);70 71 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);72 mdelay(110);73 74 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);75 mdelay(700);76 77 /* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */78 locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC);79 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);80 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);81}82 83void locomolcd_power(int on)84{85 int comadj = sharpsl_param.comadj;86 unsigned long flags;87 88 local_irq_save(flags);89 90 if (!locomolcd_dev) {91 local_irq_restore(flags);92 return;93 }94 95 /* read comadj */96 if (comadj == -1 && machine_is_collie())97 comadj = 128;98 99 if (on)100 locomolcd_on(comadj);101 else102 locomolcd_off(comadj);103 104 local_irq_restore(flags);105}106EXPORT_SYMBOL(locomolcd_power);107 108static int current_intensity;109 110static int locomolcd_set_intensity(struct backlight_device *bd)111{112 int intensity = backlight_get_brightness(bd);113 114 if (locomolcd_flags & LOCOMOLCD_SUSPENDED)115 intensity = 0;116 117 switch (intensity) {118 /*119 * AC and non-AC are handled differently,120 * but produce same results in sharp code?121 */122 case 0:123 locomo_frontlight_set(locomolcd_dev, 0, 0, 161);124 break;125 case 1:126 locomo_frontlight_set(locomolcd_dev, 117, 0, 161);127 break;128 case 2:129 locomo_frontlight_set(locomolcd_dev, 163, 0, 148);130 break;131 case 3:132 locomo_frontlight_set(locomolcd_dev, 194, 0, 161);133 break;134 case 4:135 locomo_frontlight_set(locomolcd_dev, 194, 1, 161);136 break;137 default:138 return -ENODEV;139 }140 current_intensity = intensity;141 return 0;142}143 144static int locomolcd_get_intensity(struct backlight_device *bd)145{146 return current_intensity;147}148 149static const struct backlight_ops locomobl_data = {150 .get_brightness = locomolcd_get_intensity,151 .update_status = locomolcd_set_intensity,152};153 154#ifdef CONFIG_PM_SLEEP155static int locomolcd_suspend(struct device *dev)156{157 locomolcd_flags |= LOCOMOLCD_SUSPENDED;158 locomolcd_set_intensity(locomolcd_bl_device);159 return 0;160}161 162static int locomolcd_resume(struct device *dev)163{164 locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;165 locomolcd_set_intensity(locomolcd_bl_device);166 return 0;167}168#endif169 170static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);171 172static int locomolcd_probe(struct locomo_dev *ldev)173{174 struct backlight_properties props;175 unsigned long flags;176 177 local_irq_save(flags);178 locomolcd_dev = ldev;179 180 locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);181 182 local_irq_restore(flags);183 184 memset(&props, 0, sizeof(struct backlight_properties));185 props.type = BACKLIGHT_RAW;186 props.max_brightness = 4;187 locomolcd_bl_device = backlight_device_register("locomo-bl",188 &ldev->dev, NULL,189 &locomobl_data, &props);190 191 if (IS_ERR(locomolcd_bl_device))192 return PTR_ERR(locomolcd_bl_device);193 194 /* Set up frontlight so that screen is readable */195 locomolcd_bl_device->props.brightness = 2;196 locomolcd_set_intensity(locomolcd_bl_device);197 198 return 0;199}200 201static void locomolcd_remove(struct locomo_dev *dev)202{203 unsigned long flags;204 205 locomolcd_bl_device->props.brightness = 0;206 locomolcd_bl_device->props.power = 0;207 locomolcd_set_intensity(locomolcd_bl_device);208 209 backlight_device_unregister(locomolcd_bl_device);210 local_irq_save(flags);211 locomolcd_dev = NULL;212 local_irq_restore(flags);213}214 215static struct locomo_driver poodle_lcd_driver = {216 .drv = {217 .name = "locomo-backlight",218 .pm = &locomolcd_pm_ops,219 },220 .devid = LOCOMO_DEVID_BACKLIGHT,221 .probe = locomolcd_probe,222 .remove = locomolcd_remove,223};224 225static int __init locomolcd_init(void)226{227 return locomo_driver_register(&poodle_lcd_driver);228}229 230static void __exit locomolcd_exit(void)231{232 locomo_driver_unregister(&poodle_lcd_driver);233}234 235module_init(locomolcd_init);236module_exit(locomolcd_exit);237 238MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");239MODULE_DESCRIPTION("Collie LCD driver");240MODULE_LICENSE("GPL");241