LXR linux/drivers/video/backlight/jornada720

   1/*
   2 *
   3 * LCD driver for HP Jornada 700 series (710/720/728)
   4 * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License version
   8 * 2 or any later version as published by the Free Software Foundation.
   9 *
  10 */
  11
  12#include <linux/device.h>
  13#include <linux/fb.h>
  14#include <linux/kernel.h>
  15#include <linux/lcd.h>
  16#include <linux/module.h>
  17#include <linux/platform_device.h>
  18#include <linux/delay.h>
  19
  20#include <mach/jornada720.h>
  21#include <mach/hardware.h>
  22
  23#include <video/s1d13xxxfb.h>
  24
  25#define LCD_MAX_CONTRAST        0xff
  26#define LCD_DEF_CONTRAST        0x80
  27
  28static int jornada_lcd_get_power(struct lcd_device *ld)
  29{
  30        return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  31}
  32
  33static int jornada_lcd_get_contrast(struct lcd_device *ld)
  34{
  35        int ret;
  36
  37        if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
  38                return 0;
  39
  40        jornada_ssp_start();
  41
  42        if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
  43                ret = jornada_ssp_byte(TXDUMMY);
  44                goto success;
  45        }
  46
  47        dev_err(&ld->dev, "failed to set contrast\n");
  48        ret = -ETIMEDOUT;
  49
  50success:
  51        jornada_ssp_end();
  52        return ret;
  53}
  54
  55static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
  56{
  57        int ret = 0;
  58
  59        jornada_ssp_start();
  60
  61        /* start by sending our set contrast cmd to mcu */
  62        if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
  63                /* if successful push the new value */
  64                if (jornada_ssp_byte(value) == TXDUMMY)
  65                        goto success;
  66        }
  67
  68        dev_err(&ld->dev, "failed to set contrast\n");
  69        ret = -ETIMEDOUT;
  70
  71success:
  72        jornada_ssp_end();
  73        return ret;
  74}
  75
  76static int jornada_lcd_set_power(struct lcd_device *ld, int power)
  77{
  78        if (power != FB_BLANK_UNBLANK) {
  79                PPSR &= ~PPC_LDD2;
  80                PPDR |= PPC_LDD2;
  81        } else {
  82                PPSR |= PPC_LDD2;
  83        }
  84
  85        return 0;
  86}
  87
  88static struct lcd_ops jornada_lcd_props = {
  89        .get_contrast = jornada_lcd_get_contrast,
  90        .set_contrast = jornada_lcd_set_contrast,
  91        .get_power = jornada_lcd_get_power,
  92        .set_power = jornada_lcd_set_power,
  93};
  94
  95static int jornada_lcd_probe(struct platform_device *pdev)
  96{
  97        struct lcd_device *lcd_device;
  98        int ret;
  99
 100        lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
 101                                        &pdev->dev, NULL, &jornada_lcd_props);
 102
 103        if (IS_ERR(lcd_device)) {
 104                ret = PTR_ERR(lcd_device);
 105                dev_err(&pdev->dev, "failed to register device\n");
 106                return ret;
 107        }
 108
 109        platform_set_drvdata(pdev, lcd_device);
 110
 111        /* lets set our default values */
 112        jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
 113        jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
 114        /* give it some time to startup */
 115        msleep(100);
 116
 117        return 0;
 118}
 119
 120static struct platform_driver jornada_lcd_driver = {
 121        .probe  = jornada_lcd_probe,
 122        .driver = {
 123                .name   = "jornada_lcd",
 124        },
 125};
 126
 127module_platform_driver(jornada_lcd_driver);
 128
 129MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
 130MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
 131MODULE_LICENSE("GPL");
 132