drivers/video/backlight/jornada720_lcd.c

   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
  24 static int jornada_lcd_get_power(struct lcd_device *ld)
  25 {
  26         return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  27 }
  28
  29 static 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
  46 success:
  47         jornada_ssp_end();
  48         return ret;
  49 }
  50
  51 static 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
  67 success:
  68         jornada_ssp_end();
  69         return ret;
  70 }
  71
  72 static 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
  84 static 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
  91 static 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
 116 static struct platform_driver jornada_lcd_driver = {
 117         .probe  = jornada_lcd_probe,
 118         .driver = {
 119                 .name   = "jornada_lcd",
 120         },
 121 };
 122
 123 module_platform_driver(jornada_lcd_driver);
 124
 125 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
 126 MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
 127 MODULE_LICENSE("GPL");