1 /* 2 * Backlight control code for Sharp Zaurus SL-5500 3 * 4 * Copyright 2005 John Lenz <lenz@cs.wisc.edu> 5 * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-) 6 * GPL v2 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 = bd->props.brightness; 115 116 if (bd->props.power != FB_BLANK_UNBLANK) 117 intensity = 0; 118 if (bd->props.fb_blank != FB_BLANK_UNBLANK) 119 intensity = 0; 120 if (locomolcd_flags & LOCOMOLCD_SUSPENDED) 121 intensity = 0; 122 123 switch (intensity) { 124 /* 125 * AC and non-AC are handled differently, 126 * but produce same results in sharp code? 127 */ 128 case 0: 129 locomo_frontlight_set(locomolcd_dev, 0, 0, 161); 130 break; 131 case 1: 132 locomo_frontlight_set(locomolcd_dev, 117, 0, 161); 133 break; 134 case 2: 135 locomo_frontlight_set(locomolcd_dev, 163, 0, 148); 136 break; 137 case 3: 138 locomo_frontlight_set(locomolcd_dev, 194, 0, 161); 139 break; 140 case 4: 141 locomo_frontlight_set(locomolcd_dev, 194, 1, 161); 142 break; 143 default: 144 return -ENODEV; 145 } 146 current_intensity = intensity; 147 return 0; 148 } 149 150 static int locomolcd_get_intensity(struct backlight_device *bd) 151 { 152 return current_intensity; 153 } 154 155 static const struct backlight_ops locomobl_data = { 156 .get_brightness = locomolcd_get_intensity, 157 .update_status = locomolcd_set_intensity, 158 }; 159 160 #ifdef CONFIG_PM_SLEEP 161 static int locomolcd_suspend(struct device *dev) 162 { 163 locomolcd_flags |= LOCOMOLCD_SUSPENDED; 164 locomolcd_set_intensity(locomolcd_bl_device); 165 return 0; 166 } 167 168 static int locomolcd_resume(struct device *dev) 169 { 170 locomolcd_flags &= ~LOCOMOLCD_SUSPENDED; 171 locomolcd_set_intensity(locomolcd_bl_device); 172 return 0; 173 } 174 #endif 175 176 static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume); 177 178 static int locomolcd_probe(struct locomo_dev *ldev) 179 { 180 struct backlight_properties props; 181 unsigned long flags; 182 183 local_irq_save(flags); 184 locomolcd_dev = ldev; 185 186 locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0); 187 188 /* 189 * the poodle_lcd_power function is called for the first time 190 * from fs_initcall, which is before locomo is activated. 191 * We need to recall poodle_lcd_power here 192 */ 193 if (machine_is_poodle()) 194 locomolcd_power(1); 195 196 local_irq_restore(flags); 197 198 memset(&props, 0, sizeof(struct backlight_properties)); 199 props.type = BACKLIGHT_RAW; 200 props.max_brightness = 4; 201 locomolcd_bl_device = backlight_device_register("locomo-bl", 202 &ldev->dev, NULL, 203 &locomobl_data, &props); 204 205 if (IS_ERR(locomolcd_bl_device)) 206 return PTR_ERR(locomolcd_bl_device); 207 208 /* Set up frontlight so that screen is readable */ 209 locomolcd_bl_device->props.brightness = 2; 210 locomolcd_set_intensity(locomolcd_bl_device); 211 212 return 0; 213 } 214 215 static int locomolcd_remove(struct locomo_dev *dev) 216 { 217 unsigned long flags; 218 219 locomolcd_bl_device->props.brightness = 0; 220 locomolcd_bl_device->props.power = 0; 221 locomolcd_set_intensity(locomolcd_bl_device); 222 223 backlight_device_unregister(locomolcd_bl_device); 224 local_irq_save(flags); 225 locomolcd_dev = NULL; 226 local_irq_restore(flags); 227 return 0; 228 } 229 230 static struct locomo_driver poodle_lcd_driver = { 231 .drv = { 232 .name = "locomo-backlight", 233 .pm = &locomolcd_pm_ops, 234 }, 235 .devid = LOCOMO_DEVID_BACKLIGHT, 236 .probe = locomolcd_probe, 237 .remove = locomolcd_remove, 238 }; 239 240 static int __init locomolcd_init(void) 241 { 242 return locomo_driver_register(&poodle_lcd_driver); 243 } 244 245 static void __exit locomolcd_exit(void) 246 { 247 locomo_driver_unregister(&poodle_lcd_driver); 248 } 249 250 module_init(locomolcd_init); 251 module_exit(locomolcd_exit); 252 253 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>"); 254 MODULE_DESCRIPTION("Collie LCD driver"); 255 MODULE_LICENSE("GPL"); 256