drivers/video/backlight/locomolcd.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Backlight control code for Sharp Zaurus SL-5500
   4  *
   5  * Copyright 2005 John Lenz <lenz@cs.wisc.edu>
   6  * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-)
   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 static int current_intensity;
 111
 112 static int locomolcd_set_intensity(struct backlight_device *bd)
 113 {
 114         int intensity = backlight_get_brightness(bd);
 115
 116         if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
 117                 intensity = 0;
 118
 119         switch (intensity) {
 120         /*
 121          * AC and non-AC are handled differently,
 122          * but produce same results in sharp code?
 123          */
 124         case 0:
 125                 locomo_frontlight_set(locomolcd_dev, 0, 0, 161);
 126                 break;
 127         case 1:
 128                 locomo_frontlight_set(locomolcd_dev, 117, 0, 161);
 129                 break;
 130         case 2:
 131                 locomo_frontlight_set(locomolcd_dev, 163, 0, 148);
 132                 break;
 133         case 3:
 134                 locomo_frontlight_set(locomolcd_dev, 194, 0, 161);
 135                 break;
 136         case 4:
 137                 locomo_frontlight_set(locomolcd_dev, 194, 1, 161);
 138                 break;
 139         default:
 140                 return -ENODEV;
 141         }
 142         current_intensity = intensity;
 143         return 0;
 144 }
 145
 146 static int locomolcd_get_intensity(struct backlight_device *bd)
 147 {
 148         return current_intensity;
 149 }
 150
 151 static const struct backlight_ops locomobl_data = {
 152         .get_brightness = locomolcd_get_intensity,
 153         .update_status  = locomolcd_set_intensity,
 154 };
 155
 156 #ifdef CONFIG_PM_SLEEP
 157 static int locomolcd_suspend(struct device *dev)
 158 {
 159         locomolcd_flags |= LOCOMOLCD_SUSPENDED;
 160         locomolcd_set_intensity(locomolcd_bl_device);
 161         return 0;
 162 }
 163
 164 static int locomolcd_resume(struct device *dev)
 165 {
 166         locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
 167         locomolcd_set_intensity(locomolcd_bl_device);
 168         return 0;
 169 }
 170 #endif
 171
 172 static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
 173
 174 static int locomolcd_probe(struct locomo_dev *ldev)
 175 {
 176         struct backlight_properties props;
 177         unsigned long flags;
 178
 179         local_irq_save(flags);
 180         locomolcd_dev = ldev;
 181
 182         locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
 183
 184         /*
 185          * the poodle_lcd_power function is called for the first time
 186          * from fs_initcall, which is before locomo is activated.
 187          * We need to recall poodle_lcd_power here
 188          */
 189         if (machine_is_poodle())
 190                 locomolcd_power(1);
 191
 192         local_irq_restore(flags);
 193
 194         memset(&props, 0, sizeof(struct backlight_properties));
 195         props.type = BACKLIGHT_RAW;
 196         props.max_brightness = 4;
 197         locomolcd_bl_device = backlight_device_register("locomo-bl",
 198                                                         &ldev->dev, NULL,
 199                                                         &locomobl_data, &props);
 200
 201         if (IS_ERR(locomolcd_bl_device))
 202                 return PTR_ERR(locomolcd_bl_device);
 203
 204         /* Set up frontlight so that screen is readable */
 205         locomolcd_bl_device->props.brightness = 2;
 206         locomolcd_set_intensity(locomolcd_bl_device);
 207
 208         return 0;
 209 }
 210
 211 static int locomolcd_remove(struct locomo_dev *dev)
 212 {
 213         unsigned long flags;
 214
 215         locomolcd_bl_device->props.brightness = 0;
 216         locomolcd_bl_device->props.power = 0;
 217         locomolcd_set_intensity(locomolcd_bl_device);
 218
 219         backlight_device_unregister(locomolcd_bl_device);
 220         local_irq_save(flags);
 221         locomolcd_dev = NULL;
 222         local_irq_restore(flags);
 223         return 0;
 224 }
 225
 226 static struct locomo_driver poodle_lcd_driver = {
 227         .drv = {
 228                 .name   = "locomo-backlight",
 229                 .pm     = &locomolcd_pm_ops,
 230         },
 231         .devid  = LOCOMO_DEVID_BACKLIGHT,
 232         .probe  = locomolcd_probe,
 233         .remove = locomolcd_remove,
 234 };
 235
 236 static int __init locomolcd_init(void)
 237 {
 238         return locomo_driver_register(&poodle_lcd_driver);
 239 }
 240
 241 static void __exit locomolcd_exit(void)
 242 {
 243         locomo_driver_unregister(&poodle_lcd_driver);
 244 }
 245
 246 module_init(locomolcd_init);
 247 module_exit(locomolcd_exit);
 248
 249 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
 250 MODULE_DESCRIPTION("Collie LCD driver");
 251 MODULE_LICENSE("GPL");