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@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 no one 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->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
  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->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
  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 const struct backlight_ops locomobl_data = {
 145         .get_brightness = locomolcd_get_intensity,
 146         .update_status  = locomolcd_set_intensity,
 147 };
 148
 149 #ifdef CONFIG_PM
 150 static 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
 157 static 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
 168 static 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.type = BACKLIGHT_RAW;
 188         props.max_brightness = 4;
 189         locomolcd_bl_device = backlight_device_register("locomo-bl",
 190                                                         &ldev->dev, NULL,
 191                                                         &locomobl_data, &props);
 192
 193         if (IS_ERR (locomolcd_bl_device))
 194                 return PTR_ERR (locomolcd_bl_device);
 195
 196         /* Set up frontlight so that screen is readable */
 197         locomolcd_bl_device->props.brightness = 2;
 198         locomolcd_set_intensity(locomolcd_bl_device);
 199
 200         return 0;
 201 }
 202
 203 static int locomolcd_remove(struct locomo_dev *dev)
 204 {
 205         unsigned long flags;
 206
 207         locomolcd_bl_device->props.brightness = 0;
 208         locomolcd_bl_device->props.power = 0;
 209         locomolcd_set_intensity(locomolcd_bl_device);
 210
 211         backlight_device_unregister(locomolcd_bl_device);
 212         local_irq_save(flags);
 213         locomolcd_dev = NULL;
 214         local_irq_restore(flags);
 215         return 0;
 216 }
 217
 218 static struct locomo_driver poodle_lcd_driver = {
 219         .drv = {
 220                 .name = "locomo-backlight",
 221         },
 222         .devid  = LOCOMO_DEVID_BACKLIGHT,
 223         .probe  = locomolcd_probe,
 224         .remove = locomolcd_remove,
 225         .suspend = locomolcd_suspend,
 226         .resume = locomolcd_resume,
 227 };
 228
 229
 230 static int __init locomolcd_init(void)
 231 {
 232         return locomo_driver_register(&poodle_lcd_driver);
 233 }
 234
 235 static void __exit locomolcd_exit(void)
 236 {
 237         locomo_driver_unregister(&poodle_lcd_driver);
 238 }
 239
 240 module_init(locomolcd_init);
 241 module_exit(locomolcd_exit);
 242
 243 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
 244 MODULE_DESCRIPTION("Collie LCD driver");
 245 MODULE_LICENSE("GPL");