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/config.h> 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/delay.h> 18 #include <linux/device.h> 19 #include <linux/interrupt.h> 20 21 #include <asm/hardware/locomo.h> 22 #include <asm/irq.h> 23 24 #ifdef CONFIG_SA1100_COLLIE 25 #include <asm/arch/collie.h> 26 #else 27 #include <asm/arch/poodle.h> 28 #endif 29 30 extern void (*sa1100fb_lcd_power)(int on); 31 32 static struct locomo_dev *locomolcd_dev; 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 = 118; 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 #ifdef CONFIG_MACH_POODLE 97 comadj = 118; 98 #else 99 comadj = 128; 100 #endif 101 102 if (on) 103 locomolcd_on(comadj); 104 else 105 locomolcd_off(comadj); 106 107 local_irq_restore(flags); 108 } 109 EXPORT_SYMBOL(locomolcd_power); 110 111 static int poodle_lcd_probe(struct locomo_dev *dev) 112 { 113 unsigned long flags; 114 115 local_irq_save(flags); 116 locomolcd_dev = dev; 117 118 /* the poodle_lcd_power function is called for the first time 119 * from fs_initcall, which is before locomo is activated. 120 * We need to recall poodle_lcd_power here*/ 121 #ifdef CONFIG_MACH_POODLE 122 locomolcd_power(1); 123 #endif 124 local_irq_restore(flags); 125 return 0; 126 } 127 128 static int poodle_lcd_remove(struct locomo_dev *dev) 129 { 130 unsigned long flags; 131 local_irq_save(flags); 132 locomolcd_dev = NULL; 133 local_irq_restore(flags); 134 return 0; 135 } 136 137 static struct locomo_driver poodle_lcd_driver = { 138 .drv = { 139 .name = "locomo-backlight", 140 }, 141 .devid = LOCOMO_DEVID_BACKLIGHT, 142 .probe = poodle_lcd_probe, 143 .remove = poodle_lcd_remove, 144 }; 145 146 static int __init poodle_lcd_init(void) 147 { 148 int ret = locomo_driver_register(&poodle_lcd_driver); 149 if (ret) return ret; 150 151 #ifdef CONFIG_SA1100_COLLIE 152 sa1100fb_lcd_power = locomolcd_power; 153 #endif 154 return 0; 155 } 156 device_initcall(poodle_lcd_init); 157 158