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Linux/drivers/video/backlight/jornada720_lcd.c

  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 
 28 static int jornada_lcd_get_power(struct lcd_device *ld)
 29 {
 30         return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 31 }
 32 
 33 static 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 
 50 success:
 51         jornada_ssp_end();
 52         return ret;
 53 }
 54 
 55 static 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 
 71 success:
 72         jornada_ssp_end();
 73         return ret;
 74 }
 75 
 76 static 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 
 88 static 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 
 95 static 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 
120 static struct platform_driver jornada_lcd_driver = {
121         .probe  = jornada_lcd_probe,
122         .driver = {
123                 .name   = "jornada_lcd",
124         },
125 };
126 
127 module_platform_driver(jornada_lcd_driver);
128 
129 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
130 MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
131 MODULE_LICENSE("GPL");
132 

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