drivers/video/backlight/progear_bl.c

   1 /*
   2  *  Backlight Driver for Frontpath ProGear HX1050+
   3  *
   4  *  Copyright (c) 2006 Marcin Juszkiewicz
   5  *
   6  *  Based on Progear LCD driver by M Schacht
   7  *  <mschacht at alumni dot washington dot edu>
   8  *
   9  *  Based on Sharp's Corgi Backlight Driver
  10  *  Based on Backlight Driver for HP Jornada 680
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License version 2 as
  14  *  published by the Free Software Foundation.
  15  *
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/mutex.h>
  23 #include <linux/fb.h>
  24 #include <linux/backlight.h>
  25 #include <linux/pci.h>
  26 #include <asm/uaccess.h>
  27
  28 #define PMU_LPCR               0xB0
  29 #define SB_MPS1                0x61
  30 #define HW_LEVEL_MAX           0x77
  31 #define HW_LEVEL_MIN           0x4f
  32
  33 static struct pci_dev *pmu_dev = NULL;
  34 static struct pci_dev *sb_dev = NULL;
  35
  36 static int progearbl_set_intensity(struct backlight_device *bd)
  37 {
  38         int intensity = bd->props->brightness;
  39
  40         if (bd->props->power != FB_BLANK_UNBLANK)
  41                 intensity = 0;
  42         if (bd->props->fb_blank != FB_BLANK_UNBLANK)
  43                 intensity = 0;
  44
  45         pci_write_config_byte(pmu_dev, PMU_LPCR, intensity + HW_LEVEL_MIN);
  46
  47         return 0;
  48 }
  49
  50 static int progearbl_get_intensity(struct backlight_device *bd)
  51 {
  52         u8 intensity;
  53         pci_read_config_byte(pmu_dev, PMU_LPCR, &intensity);
  54
  55         return intensity - HW_LEVEL_MIN;
  56 }
  57
  58 static struct backlight_properties progearbl_data = {
  59         .owner = THIS_MODULE,
  60         .get_brightness = progearbl_get_intensity,
  61         .update_status = progearbl_set_intensity,
  62 };
  63
  64 static int progearbl_probe(struct platform_device *pdev)
  65 {
  66         u8 temp;
  67         struct backlight_device *progear_backlight_device;
  68
  69         pmu_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, 0);
  70         if (!pmu_dev) {
  71                 printk("ALI M7101 PMU not found.\n");
  72                 return -ENODEV;
  73         }
  74
  75         sb_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, 0);
  76         if (!sb_dev) {
  77                 printk("ALI 1533 SB not found.\n");
  78                 pci_dev_put(pmu_dev);
  79                 return -ENODEV;
  80         }
  81
  82         /*     Set SB_MPS1 to enable brightness control. */
  83         pci_read_config_byte(sb_dev, SB_MPS1, &temp);
  84         pci_write_config_byte(sb_dev, SB_MPS1, temp | 0x20);
  85
  86         progear_backlight_device = backlight_device_register("progear-bl",
  87                                                              &pdev->dev, NULL,
  88                                                              &progearbl_data);
  89         if (IS_ERR(progear_backlight_device))
  90                 return PTR_ERR(progear_backlight_device);
  91
  92         platform_set_drvdata(pdev, progear_backlight_device);
  93
  94         progearbl_data.power = FB_BLANK_UNBLANK;
  95         progearbl_data.brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
  96         progearbl_data.max_brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
  97         progearbl_set_intensity(progear_backlight_device);
  98
  99         return 0;
 100 }
 101
 102 static int progearbl_remove(struct platform_device *pdev)
 103 {
 104         struct backlight_device *bd = platform_get_drvdata(pdev);
 105         backlight_device_unregister(bd);
 106
 107         return 0;
 108 }
 109
 110 static struct platform_driver progearbl_driver = {
 111         .probe = progearbl_probe,
 112         .remove = progearbl_remove,
 113         .driver = {
 114                    .name = "progear-bl",
 115                    },
 116 };
 117
 118 static struct platform_device *progearbl_device;
 119
 120 static int __init progearbl_init(void)
 121 {
 122         int ret = platform_driver_register(&progearbl_driver);
 123
 124         if (!ret) {
 125                 progearbl_device = platform_device_alloc("progear-bl", -1);
 126                 if (!progearbl_device)
 127                         return -ENOMEM;
 128
 129                 ret = platform_device_add(progearbl_device);
 130
 131                 if (ret) {
 132                         platform_device_put(progearbl_device);
 133                         platform_driver_unregister(&progearbl_driver);
 134                 }
 135         }
 136
 137         return ret;
 138 }
 139
 140 static void __exit progearbl_exit(void)
 141 {
 142         pci_dev_put(pmu_dev);
 143         pci_dev_put(sb_dev);
 144
 145         platform_device_unregister(progearbl_device);
 146         platform_driver_unregister(&progearbl_driver);
 147 }
 148
 149 module_init(progearbl_init);
 150 module_exit(progearbl_exit);
 151
 152 MODULE_AUTHOR("Marcin Juszkiewicz <linux@hrw.one.pl>");
 153 MODULE_DESCRIPTION("ProGear Backlight Driver");
 154 MODULE_LICENSE("GPL");