LXR linux/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
  29static struct backlight_device *locomolcd_bl_device;
  30static struct locomo_dev *locomolcd_dev;
  31static unsigned long locomolcd_flags;
  32#define LOCOMOLCD_SUSPENDED     0x01
  33
  34static 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
  65static 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
  83void 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}
 108EXPORT_SYMBOL(locomolcd_power);
 109
 110static int current_intensity;
 111
 112static 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
 146static int locomolcd_get_intensity(struct backlight_device *bd)
 147{
 148        return current_intensity;
 149}
 150
 151static 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
 157static int locomolcd_suspend(struct device *dev)
 158{
 159        locomolcd_flags |= LOCOMOLCD_SUSPENDED;
 160        locomolcd_set_intensity(locomolcd_bl_device);
 161        return 0;
 162}
 163
 164static 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
 172static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
 173
 174static 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
 211static void 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}
 224
 225static struct locomo_driver poodle_lcd_driver = {
 226        .drv = {
 227                .name   = "locomo-backlight",
 228                .pm     = &locomolcd_pm_ops,
 229        },
 230        .devid  = LOCOMO_DEVID_BACKLIGHT,
 231        .probe  = locomolcd_probe,
 232        .remove = locomolcd_remove,
 233};
 234
 235static int __init locomolcd_init(void)
 236{
 237        return locomo_driver_register(&poodle_lcd_driver);
 238}
 239
 240static void __exit locomolcd_exit(void)
 241{
 242        locomo_driver_unregister(&poodle_lcd_driver);
 243}
 244
 245module_init(locomolcd_init);
 246module_exit(locomolcd_exit);
 247
 248MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
 249MODULE_DESCRIPTION("Collie LCD driver");
 250MODULE_LICENSE("GPL");
 251