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 #include <asm/mach/sharpsl_param.h>
  24 #include <asm/mach-types.h>
  25
  26 #include "../../../arch/arm/mach-sa1100/generic.h"
  27
  28 static struct locomo_dev *locomolcd_dev;
  29
  30 static void locomolcd_on(int comadj)
  31 {
  32         locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 0);
  33         locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 1);
  34         mdelay(2);
  35
  36         locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 0);
  37         locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 1);
  38         mdelay(2);
  39
  40         locomo_m62332_senddata(locomolcd_dev, comadj, 0);
  41         mdelay(5);
  42
  43         locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 0);
  44         locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 1);
  45         mdelay(10);
  46
  47         /* TFTCRST | CPSOUT=0 | CPSEN */
  48         locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);
  49
  50         /* Set CPSD */
  51         locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);
  52
  53         /* TFTCRST | CPSOUT=0 | CPSEN */
  54         locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);
  55         mdelay(10);
  56
  57         locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 0);
  58         locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 1);
  59 }
  60
  61 static void locomolcd_off(int comadj)
  62 {
  63         /* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
  64         locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);
  65         mdelay(1);
  66
  67         locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 0);
  68         mdelay(110);
  69
  70         locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 0);
  71         mdelay(700);
  72
  73         /* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
  74         locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC);
  75         locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 0);
  76         locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 0);
  77 }
  78
  79 void locomolcd_power(int on)
  80 {
  81         int comadj = sharpsl_param.comadj;
  82         unsigned long flags;
  83
  84         local_irq_save(flags);
  85
  86         if (!locomolcd_dev) {
  87                 local_irq_restore(flags);
  88                 return;
  89         }
  90
  91         /* read comadj */
  92         if (comadj == -1) {
  93                 if (machine_is_poodle())
  94                         comadj = 118;
  95                 if (machine_is_collie())
  96                         comadj = 128;
  97         }
  98
  99         if (on)
 100                 locomolcd_on(comadj);
 101         else
 102                 locomolcd_off(comadj);
 103
 104         local_irq_restore(flags);
 105 }
 106 EXPORT_SYMBOL(locomolcd_power);
 107
 108 static int poodle_lcd_probe(struct locomo_dev *dev)
 109 {
 110         unsigned long flags;
 111
 112         local_irq_save(flags);
 113         locomolcd_dev = dev;
 114
 115         /* the poodle_lcd_power function is called for the first time
 116          * from fs_initcall, which is before locomo is activated.
 117          * We need to recall poodle_lcd_power here*/
 118 #ifdef CONFIG_MACH_POODLE
 119         locomolcd_power(1);
 120 #endif
 121         local_irq_restore(flags);
 122         return 0;
 123 }
 124
 125 static int poodle_lcd_remove(struct locomo_dev *dev)
 126 {
 127         unsigned long flags;
 128         local_irq_save(flags);
 129         locomolcd_dev = NULL;
 130         local_irq_restore(flags);
 131         return 0;
 132 }
 133
 134 static struct locomo_driver poodle_lcd_driver = {
 135         .drv = {
 136                 .name = "locomo-backlight",
 137         },
 138         .devid  = LOCOMO_DEVID_BACKLIGHT,
 139         .probe  = poodle_lcd_probe,
 140         .remove = poodle_lcd_remove,
 141 };
 142
 143 static int __init poodle_lcd_init(void)
 144 {
 145         int ret = locomo_driver_register(&poodle_lcd_driver);
 146         if (ret) return ret;
 147
 148 #ifdef CONFIG_SA1100_COLLIE
 149         sa1100fb_lcd_power = locomolcd_power;
 150 #endif
 151         return 0;
 152 }
 153 device_initcall(poodle_lcd_init);
 154