LXR linux/drivers/video/backlight/jornada720

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *
   4 * LCD driver for HP Jornada 700 series (710/720/728)
   5 * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
   6 */
   7
   8#include <linux/device.h>
   9#include <linux/fb.h>
  10#include <linux/kernel.h>
  11#include <linux/lcd.h>
  12#include <linux/module.h>
  13#include <linux/platform_device.h>
  14#include <linux/delay.h>
  15
  16#include <mach/jornada720.h>
  17#include <mach/hardware.h>
  18
  19#include <video/s1d13xxxfb.h>
  20
  21#define LCD_MAX_CONTRAST        0xff
  22#define LCD_DEF_CONTRAST        0x80
  23
  24static int jornada_lcd_get_power(struct lcd_device *ld)
  25{
  26        return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  27}
  28
  29static int jornada_lcd_get_contrast(struct lcd_device *ld)
  30{
  31        int ret;
  32
  33        if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
  34                return 0;
  35
  36        jornada_ssp_start();
  37
  38        if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
  39                ret = jornada_ssp_byte(TXDUMMY);
  40                goto success;
  41        }
  42
  43        dev_err(&ld->dev, "failed to set contrast\n");
  44        ret = -ETIMEDOUT;
  45
  46success:
  47        jornada_ssp_end();
  48        return ret;
  49}
  50
  51static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
  52{
  53        int ret = 0;
  54
  55        jornada_ssp_start();
  56
  57        /* start by sending our set contrast cmd to mcu */
  58        if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
  59                /* if successful push the new value */
  60                if (jornada_ssp_byte(value) == TXDUMMY)
  61                        goto success;
  62        }
  63
  64        dev_err(&ld->dev, "failed to set contrast\n");
  65        ret = -ETIMEDOUT;
  66
  67success:
  68        jornada_ssp_end();
  69        return ret;
  70}
  71
  72static int jornada_lcd_set_power(struct lcd_device *ld, int power)
  73{
  74        if (power != FB_BLANK_UNBLANK) {
  75                PPSR &= ~PPC_LDD2;
  76                PPDR |= PPC_LDD2;
  77        } else {
  78                PPSR |= PPC_LDD2;
  79        }
  80
  81        return 0;
  82}
  83
  84static struct lcd_ops jornada_lcd_props = {
  85        .get_contrast = jornada_lcd_get_contrast,
  86        .set_contrast = jornada_lcd_set_contrast,
  87        .get_power = jornada_lcd_get_power,
  88        .set_power = jornada_lcd_set_power,
  89};
  90
  91static int jornada_lcd_probe(struct platform_device *pdev)
  92{
  93        struct lcd_device *lcd_device;
  94        int ret;
  95
  96        lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
  97                                        &pdev->dev, NULL, &jornada_lcd_props);
  98
  99        if (IS_ERR(lcd_device)) {
 100                ret = PTR_ERR(lcd_device);
 101                dev_err(&pdev->dev, "failed to register device\n");
 102                return ret;
 103        }
 104
 105        platform_set_drvdata(pdev, lcd_device);
 106
 107        /* lets set our default values */
 108        jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
 109        jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
 110        /* give it some time to startup */
 111        msleep(100);
 112
 113        return 0;
 114}
 115
 116static struct platform_driver jornada_lcd_driver = {
 117        .probe  = jornada_lcd_probe,
 118        .driver = {
 119                .name   = "jornada_lcd",
 120        },
 121};
 122
 123module_platform_driver(jornada_lcd_driver);
 124
 125MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
 126MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
 127MODULE_LICENSE("GPL");
 128