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 noone 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 29static struct backlight_device *locomolcd_bl_device; 30static struct locomo_dev *locomolcd_dev; 31static unsigned long locomolcd_flags; 32#define LOCOMOLCD_SUSPENDED 0x01 33 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 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} 108EXPORT_SYMBOL(locomolcd_power); 109 110 111static int current_intensity; 112 113static int locomolcd_set_intensity(struct backlight_device *bd) 114{ 115 int intensity = bd->props.brightness; 116 117 if (bd->props.power != FB_BLANK_UNBLANK) 118 intensity = 0; 119 if (bd->props.fb_blank != FB_BLANK_UNBLANK) 120 intensity = 0; 121 if (locomolcd_flags & LOCOMOLCD_SUSPENDED) 122 intensity = 0; 123 124 switch (intensity) { 125 /* AC and non-AC are handled differently, but produce same results in sharp code? */ 126 case 0: locomo_frontlight_set(locomolcd_dev, 0, 0, 161); break; 127 case 1: locomo_frontlight_set(locomolcd_dev, 117, 0, 161); break; 128 case 2: locomo_frontlight_set(locomolcd_dev, 163, 0, 148); break; 129 case 3: locomo_frontlight_set(locomolcd_dev, 194, 0, 161); break; 130 case 4: locomo_frontlight_set(locomolcd_dev, 194, 1, 161); break; 131 132 default: 133 return -ENODEV; 134 } 135 current_intensity = intensity; 136 return 0; 137} 138 139static int locomolcd_get_intensity(struct backlight_device *bd) 140{ 141 return current_intensity; 142} 143 144static const struct backlight_ops locomobl_data = { 145 .get_brightness = locomolcd_get_intensity, 146 .update_status = locomolcd_set_intensity, 147}; 148 149#ifdef CONFIG_PM 150static int locomolcd_suspend(struct locomo_dev *dev, pm_message_t state) 151{ 152 locomolcd_flags |= LOCOMOLCD_SUSPENDED; 153 locomolcd_set_intensity(locomolcd_bl_device); 154 return 0; 155} 156 157static int locomolcd_resume(struct locomo_dev *dev) 158{ 159 locomolcd_flags &= ~LOCOMOLCD_SUSPENDED; 160 locomolcd_set_intensity(locomolcd_bl_device); 161 return 0; 162} 163#else 164#define locomolcd_suspend NULL 165#define locomolcd_resume NULL 166#endif 167 168static int locomolcd_probe(struct locomo_dev *ldev) 169{ 170 struct backlight_properties props; 171 unsigned long flags; 172 173 local_irq_save(flags); 174 locomolcd_dev = ldev; 175 176 locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0); 177 178 /* the poodle_lcd_power function is called for the first time 179 * from fs_initcall, which is before locomo is activated. 180 * We need to recall poodle_lcd_power here*/ 181 if (machine_is_poodle()) 182 locomolcd_power(1); 183 184 local_irq_restore(flags); 185 186 memset(&props, 0, sizeof(struct backlight_properties)); 187 props.max_brightness = 4; 188 locomolcd_bl_device = backlight_device_register("locomo-bl", 189 &ldev->dev, NULL, 190 &locomobl_data, &props); 191 192 if (IS_ERR (locomolcd_bl_device)) 193 return PTR_ERR (locomolcd_bl_device); 194 195 /* Set up frontlight so that screen is readable */ 196 locomolcd_bl_device->props.brightness = 2; 197 locomolcd_set_intensity(locomolcd_bl_device); 198 199 return 0; 200} 201 202static int locomolcd_remove(struct locomo_dev *dev) 203{ 204 unsigned long flags; 205 206 locomolcd_bl_device->props.brightness = 0; 207 locomolcd_bl_device->props.power = 0; 208 locomolcd_set_intensity(locomolcd_bl_device); 209 210 backlight_device_unregister(locomolcd_bl_device); 211 local_irq_save(flags); 212 locomolcd_dev = NULL; 213 local_irq_restore(flags); 214 return 0; 215} 216 217static struct locomo_driver poodle_lcd_driver = { 218 .drv = { 219 .name = "locomo-backlight", 220 }, 221 .devid = LOCOMO_DEVID_BACKLIGHT, 222 .probe = locomolcd_probe, 223 .remove = locomolcd_remove, 224 .suspend = locomolcd_suspend, 225 .resume = locomolcd_resume, 226}; 227 228 229static int __init locomolcd_init(void) 230{ 231 int ret = locomo_driver_register(&poodle_lcd_driver); 232 if (ret) 233 return ret; 234 235#ifdef CONFIG_SA1100_COLLIE 236 sa1100fb_lcd_power = locomolcd_power; 237#endif 238 return 0; 239} 240 241static void __exit locomolcd_exit(void) 242{ 243 locomo_driver_unregister(&poodle_lcd_driver); 244} 245 246module_init(locomolcd_init); 247module_exit(locomolcd_exit); 248 249MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>"); 250MODULE_DESCRIPTION("Collie LCD driver"); 251MODULE_LICENSE("GPL"); 252