1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Backlight control code for Sharp Zaurus SL-5500 4 * 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 is 9 * slightly old hardware, and no one is going to retrofit second CPU to 10 * 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 29 static struct backlight_device *locomolcd_bl_device; 30 static struct locomo_dev *locomolcd_dev; 31 static unsigned long locomolcd_flags; 32 #define LOCOMOLCD_SUSPENDED 0x01 33 34 static 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 65 static 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 83 void 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 else 102 locomolcd_off(comadj); 103 104 local_irq_restore(flags); 105 } 106 EXPORT_SYMBOL(locomolcd_power); 107 108 static int current_intensity; 109 110 static 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 } 143 144 static int locomolcd_get_intensity(struct backlight_device *bd) 145 { 146 return current_intensity; 147 } 148 149 static const struct backlight_ops locomobl_data = { 150 .get_brightness = locomolcd_get_intensity, 151 .update_status = locomolcd_set_intensity, 152 }; 153 154 #ifdef CONFIG_PM_SLEEP 155 static int locomolcd_suspend(struct device *dev) 156 { 157 locomolcd_flags |= LOCOMOLCD_SUSPENDED; 158 locomolcd_set_intensity(locomolcd_bl_device); 159 return 0; 160 } 161 162 static int locomolcd_resume(struct device *dev) 163 { 164 locomolcd_flags &= ~LOCOMOLCD_SUSPENDED; 165 locomolcd_set_intensity(locomolcd_bl_device); 166 return 0; 167 } 168 #endif 169 170 static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume); 171 172 static 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 } 200 201 static 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 } 214 215 static 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 }; 224 225 static int __init locomolcd_init(void) 226 { 227 return locomo_driver_register(&poodle_lcd_driver); 228 } 229 230 static void __exit locomolcd_exit(void) 231 { 232 locomo_driver_unregister(&poodle_lcd_driver); 233 } 234 235 module_init(locomolcd_init); 236 module_exit(locomolcd_exit); 237 238 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>"); 239 MODULE_DESCRIPTION("Collie LCD driver"); 240 MODULE_LICENSE("GPL"); 241