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 if (comadj == -1 && machine_is_poodle()) 99 comadj = 118; 100 101 if (on) 102 locomolcd_on(comadj); 103 else 104 locomolcd_off(comadj); 105 106 local_irq_restore(flags); 107 } 108 EXPORT_SYMBOL(locomolcd_power); 109 110 static int current_intensity; 111 112 static int locomolcd_set_intensity(struct backlight_device *bd) 113 { 114 int intensity = backlight_get_brightness(bd); 115 116 if (locomolcd_flags & LOCOMOLCD_SUSPENDED) 117 intensity = 0; 118 119 switch (intensity) { 120 /* 121 * AC and non-AC are handled differently, 122 * but produce same results in sharp code? 123 */ 124 case 0: 125 locomo_frontlight_set(locomolcd_dev, 0, 0, 161); 126 break; 127 case 1: 128 locomo_frontlight_set(locomolcd_dev, 117, 0, 161); 129 break; 130 case 2: 131 locomo_frontlight_set(locomolcd_dev, 163, 0, 148); 132 break; 133 case 3: 134 locomo_frontlight_set(locomolcd_dev, 194, 0, 161); 135 break; 136 case 4: 137 locomo_frontlight_set(locomolcd_dev, 194, 1, 161); 138 break; 139 default: 140 return -ENODEV; 141 } 142 current_intensity = intensity; 143 return 0; 144 } 145 146 static int locomolcd_get_intensity(struct backlight_device *bd) 147 { 148 return current_intensity; 149 } 150 151 static const struct backlight_ops locomobl_data = { 152 .get_brightness = locomolcd_get_intensity, 153 .update_status = locomolcd_set_intensity, 154 }; 155 156 #ifdef CONFIG_PM_SLEEP 157 static int locomolcd_suspend(struct device *dev) 158 { 159 locomolcd_flags |= LOCOMOLCD_SUSPENDED; 160 locomolcd_set_intensity(locomolcd_bl_device); 161 return 0; 162 } 163 164 static int locomolcd_resume(struct device *dev) 165 { 166 locomolcd_flags &= ~LOCOMOLCD_SUSPENDED; 167 locomolcd_set_intensity(locomolcd_bl_device); 168 return 0; 169 } 170 #endif 171 172 static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume); 173 174 static int locomolcd_probe(struct locomo_dev *ldev) 175 { 176 struct backlight_properties props; 177 unsigned long flags; 178 179 local_irq_save(flags); 180 locomolcd_dev = ldev; 181 182 locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0); 183 184 /* 185 * the poodle_lcd_power function is called for the first time 186 * from fs_initcall, which is before locomo is activated. 187 * We need to recall poodle_lcd_power here 188 */ 189 if (machine_is_poodle()) 190 locomolcd_power(1); 191 192 local_irq_restore(flags); 193 194 memset(&props, 0, sizeof(struct backlight_properties)); 195 props.type = BACKLIGHT_RAW; 196 props.max_brightness = 4; 197 locomolcd_bl_device = backlight_device_register("locomo-bl", 198 &ldev->dev, NULL, 199 &locomobl_data, &props); 200 201 if (IS_ERR(locomolcd_bl_device)) 202 return PTR_ERR(locomolcd_bl_device); 203 204 /* Set up frontlight so that screen is readable */ 205 locomolcd_bl_device->props.brightness = 2; 206 locomolcd_set_intensity(locomolcd_bl_device); 207 208 return 0; 209 } 210 211 static void locomolcd_remove(struct locomo_dev *dev) 212 { 213 unsigned long flags; 214 215 locomolcd_bl_device->props.brightness = 0; 216 locomolcd_bl_device->props.power = 0; 217 locomolcd_set_intensity(locomolcd_bl_device); 218 219 backlight_device_unregister(locomolcd_bl_device); 220 local_irq_save(flags); 221 locomolcd_dev = NULL; 222 local_irq_restore(flags); 223 } 224 225 static struct locomo_driver poodle_lcd_driver = { 226 .drv = { 227 .name = "locomo-backlight", 228 .pm = &locomolcd_pm_ops, 229 }, 230 .devid = LOCOMO_DEVID_BACKLIGHT, 231 .probe = locomolcd_probe, 232 .remove = locomolcd_remove, 233 }; 234 235 static int __init locomolcd_init(void) 236 { 237 return locomo_driver_register(&poodle_lcd_driver); 238 } 239 240 static void __exit locomolcd_exit(void) 241 { 242 locomo_driver_unregister(&poodle_lcd_driver); 243 } 244 245 module_init(locomolcd_init); 246 module_exit(locomolcd_exit); 247 248 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>"); 249 MODULE_DESCRIPTION("Collie LCD driver"); 250 MODULE_LICENSE("GPL"); 251