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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         /* LDD2 in PPC = LCD POWER */
 31         if (PPSR & PPC_LDD2)
 32                 return FB_BLANK_UNBLANK;        /* PW ON */
 33         else
 34                 return FB_BLANK_POWERDOWN;      /* PW OFF */
 35 }
 36 
 37 static int jornada_lcd_get_contrast(struct lcd_device *ld)
 38 {
 39         int ret;
 40 
 41         if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
 42                 return 0;
 43 
 44         jornada_ssp_start();
 45 
 46         if (jornada_ssp_byte(GETCONTRAST) != TXDUMMY) {
 47                 dev_err(&ld->dev, "get contrast failed\n");
 48                 jornada_ssp_end();
 49                 return -ETIMEDOUT;
 50         } else {
 51                 ret = jornada_ssp_byte(TXDUMMY);
 52                 jornada_ssp_end();
 53                 return ret;
 54         }
 55 }
 56 
 57 static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
 58 {
 59         int ret;
 60 
 61         jornada_ssp_start();
 62 
 63         /* start by sending our set contrast cmd to mcu */
 64         ret = jornada_ssp_byte(SETCONTRAST);
 65 
 66         /* push the new value */
 67         if (jornada_ssp_byte(value) != TXDUMMY) {
 68                 dev_err(&ld->dev, "set contrast failed\n");
 69                 jornada_ssp_end();
 70                 return -ETIMEDOUT;
 71         }
 72 
 73         /* if we get here we can assume everything went well */
 74         jornada_ssp_end();
 75 
 76         return 0;
 77 }
 78 
 79 static int jornada_lcd_set_power(struct lcd_device *ld, int power)
 80 {
 81         if (power != FB_BLANK_UNBLANK) {
 82                 PPSR &= ~PPC_LDD2;
 83                 PPDR |= PPC_LDD2;
 84         } else {
 85                 PPSR |= PPC_LDD2;
 86         }
 87 
 88         return 0;
 89 }
 90 
 91 static struct lcd_ops jornada_lcd_props = {
 92         .get_contrast = jornada_lcd_get_contrast,
 93         .set_contrast = jornada_lcd_set_contrast,
 94         .get_power = jornada_lcd_get_power,
 95         .set_power = jornada_lcd_set_power,
 96 };
 97 
 98 static int jornada_lcd_probe(struct platform_device *pdev)
 99 {
100         struct lcd_device *lcd_device;
101         int ret;
102 
103         lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
104                                         &pdev->dev, NULL, &jornada_lcd_props);
105 
106         if (IS_ERR(lcd_device)) {
107                 ret = PTR_ERR(lcd_device);
108                 dev_err(&pdev->dev, "failed to register device\n");
109                 return ret;
110         }
111 
112         platform_set_drvdata(pdev, lcd_device);
113 
114         /* lets set our default values */
115         jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
116         jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
117         /* give it some time to startup */
118         msleep(100);
119 
120         return 0;
121 }
122 
123 static struct platform_driver jornada_lcd_driver = {
124         .probe  = jornada_lcd_probe,
125         .driver = {
126                 .name   = "jornada_lcd",
127         },
128 };
129 
130 module_platform_driver(jornada_lcd_driver);
131 
132 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
133 MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
134 MODULE_LICENSE("GPL");
135 

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