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@suse.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 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, LOCOMO_GPIO_LCD_VSHA_ON, 0); 37 locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 1); 38 mdelay(2); 39 40 locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 0); 41 locomo_gpio_write(locomolcd_dev, 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, LOCOMO_GPIO_LCD_VEE_ON, 0); 48 locomo_gpio_write(locomolcd_dev, 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, LOCOMO_GPIO_LCD_MOD, 0); 62 locomo_gpio_write(locomolcd_dev, 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, LOCOMO_GPIO_LCD_VSHA_ON, 0); 72 mdelay(110); 73 74 locomo_gpio_write(locomolcd_dev, 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, LOCOMO_GPIO_LCD_MOD, 0); 80 locomo_gpio_write(locomolcd_dev, 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); 109 110 111 static int current_intensity; 112 113 static 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 } 138 139 static int locomolcd_get_intensity(struct backlight_device *bd) 140 { 141 return current_intensity; 142 } 143 144 static struct backlight_properties locomobl_data = { 145 .owner = THIS_MODULE, 146 .get_brightness = locomolcd_get_intensity, 147 .update_status = locomolcd_set_intensity, 148 .max_brightness = 4, 149 }; 150 151 #ifdef CONFIG_PM 152 static int locomolcd_suspend(struct locomo_dev *dev, pm_message_t state) 153 { 154 locomolcd_flags |= LOCOMOLCD_SUSPENDED; 155 locomolcd_set_intensity(locomolcd_bl_device); 156 return 0; 157 } 158 159 static int locomolcd_resume(struct locomo_dev *dev) 160 { 161 locomolcd_flags &= ~LOCOMOLCD_SUSPENDED; 162 locomolcd_set_intensity(locomolcd_bl_device); 163 return 0; 164 } 165 #else 166 #define locomolcd_suspend NULL 167 #define locomolcd_resume NULL 168 #endif 169 170 static int locomolcd_probe(struct locomo_dev *dev) 171 { 172 unsigned long flags; 173 174 local_irq_save(flags); 175 locomolcd_dev = dev; 176 177 locomo_gpio_set_dir(dev, LOCOMO_GPIO_FL_VR, 0); 178 179 /* the poodle_lcd_power function is called for the first time 180 * from fs_initcall, which is before locomo is activated. 181 * We need to recall poodle_lcd_power here*/ 182 if (machine_is_poodle()) 183 locomolcd_power(1); 184 185 local_irq_restore(flags); 186 187 locomolcd_bl_device = backlight_device_register("locomo-bl", NULL, &locomobl_data); 188 189 if (IS_ERR (locomolcd_bl_device)) 190 return PTR_ERR (locomolcd_bl_device); 191 192 /* Set up frontlight so that screen is readable */ 193 locomobl_data.brightness = 2; 194 locomolcd_set_intensity(locomolcd_bl_device); 195 196 return 0; 197 } 198 199 static int locomolcd_remove(struct locomo_dev *dev) 200 { 201 unsigned long flags; 202 203 backlight_device_unregister(locomolcd_bl_device); 204 local_irq_save(flags); 205 locomolcd_dev = NULL; 206 local_irq_restore(flags); 207 return 0; 208 } 209 210 static struct locomo_driver poodle_lcd_driver = { 211 .drv = { 212 .name = "locomo-backlight", 213 }, 214 .devid = LOCOMO_DEVID_BACKLIGHT, 215 .probe = locomolcd_probe, 216 .remove = locomolcd_remove, 217 .suspend = locomolcd_suspend, 218 .resume = locomolcd_resume, 219 }; 220 221 222 static int __init locomolcd_init(void) 223 { 224 int ret = locomo_driver_register(&poodle_lcd_driver); 225 if (ret) 226 return ret; 227 228 #ifdef CONFIG_SA1100_COLLIE 229 sa1100fb_lcd_power = locomolcd_power; 230 #endif 231 return 0; 232 } 233 234 static void __exit locomolcd_exit(void) 235 { 236 locomo_driver_unregister(&poodle_lcd_driver); 237 } 238 239 module_init(locomolcd_init); 240 module_exit(locomolcd_exit); 241 242 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@suse.cz>"); 243 MODULE_DESCRIPTION("Collie LCD driver"); 244 MODULE_LICENSE("GPL"); 245