drivers/video/backlight/locomolcd.c

   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