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
  27 #define PMU_LPCR               0xB0
  28 #define SB_MPS1                0x61
  29 #define HW_LEVEL_MAX           0x77
  30 #define HW_LEVEL_MIN           0x4f
  31
  32 static struct pci_dev *pmu_dev = NULL;
  33 static struct pci_dev *sb_dev = NULL;
  34
  35 static int progearbl_set_intensity(struct backlight_device *bd)
  36 {
  37         int intensity = bd->props.brightness;
  38
  39         if (bd->props.power != FB_BLANK_UNBLANK)
  40                 intensity = 0;
  41         if (bd->props.fb_blank != FB_BLANK_UNBLANK)
  42                 intensity = 0;
  43
  44         pci_write_config_byte(pmu_dev, PMU_LPCR, intensity + HW_LEVEL_MIN);
  45
  46         return 0;
  47 }
  48
  49 static int progearbl_get_intensity(struct backlight_device *bd)
  50 {
  51         u8 intensity;
  52         pci_read_config_byte(pmu_dev, PMU_LPCR, &intensity);
  53
  54         return intensity - HW_LEVEL_MIN;
  55 }
  56
  57 static const struct backlight_ops progearbl_ops = {
  58         .get_brightness = progearbl_get_intensity,
  59         .update_status = progearbl_set_intensity,
  60 };
  61
  62 static int progearbl_probe(struct platform_device *pdev)
  63 {
  64         u8 temp;
  65         struct backlight_device *progear_backlight_device;
  66         int ret;
  67
  68         pmu_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, NULL);
  69         if (!pmu_dev) {
  70                 printk("ALI M7101 PMU not found.\n");
  71                 return -ENODEV;
  72         }
  73
  74         sb_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
  75         if (!sb_dev) {
  76                 printk("ALI 1533 SB not found.\n");
  77                 ret = -ENODEV;
  78                 goto put_pmu;
  79         }
  80
  81         /*     Set SB_MPS1 to enable brightness control. */
  82         pci_read_config_byte(sb_dev, SB_MPS1, &temp);
  83         pci_write_config_byte(sb_dev, SB_MPS1, temp | 0x20);
  84
  85         progear_backlight_device = backlight_device_register("progear-bl",
  86                                                              &pdev->dev, NULL,
  87                                                              &progearbl_ops);
  88         if (IS_ERR(progear_backlight_device)) {
  89                 ret = PTR_ERR(progear_backlight_device);
  90                 goto put_sb;
  91         }
  92
  93         platform_set_drvdata(pdev, progear_backlight_device);
  94
  95         progear_backlight_device->props.power = FB_BLANK_UNBLANK;
  96         progear_backlight_device->props.brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
  97         progear_backlight_device->props.max_brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
  98         progearbl_set_intensity(progear_backlight_device);
  99
 100         return 0;
 101 put_sb:
 102         pci_dev_put(sb_dev);
 103 put_pmu:
 104         pci_dev_put(pmu_dev);
 105         return ret;
 106 }
 107
 108 static int progearbl_remove(struct platform_device *pdev)
 109 {
 110         struct backlight_device *bd = platform_get_drvdata(pdev);
 111         backlight_device_unregister(bd);
 112
 113         return 0;
 114 }
 115
 116 static struct platform_driver progearbl_driver = {
 117         .probe = progearbl_probe,
 118         .remove = progearbl_remove,
 119         .driver = {
 120                    .name = "progear-bl",
 121                    },
 122 };
 123
 124 static struct platform_device *progearbl_device;
 125
 126 static int __init progearbl_init(void)
 127 {
 128         int ret = platform_driver_register(&progearbl_driver);
 129
 130         if (ret)
 131                 return ret;
 132         progearbl_device = platform_device_register_simple("progear-bl", -1,
 133                                                                 NULL, 0);
 134         if (IS_ERR(progearbl_device)) {
 135                 platform_driver_unregister(&progearbl_driver);
 136                 return PTR_ERR(progearbl_device);
 137         }
 138
 139         return 0;
 140 }
 141
 142 static void __exit progearbl_exit(void)
 143 {
 144         pci_dev_put(pmu_dev);
 145         pci_dev_put(sb_dev);
 146
 147         platform_device_unregister(progearbl_device);
 148         platform_driver_unregister(&progearbl_driver);
 149 }
 150
 151 module_init(progearbl_init);
 152 module_exit(progearbl_exit);
 153
 154 MODULE_AUTHOR("Marcin Juszkiewicz <linux@hrw.one.pl>");
 155 MODULE_DESCRIPTION("ProGear Backlight Driver");
 156 MODULE_LICENSE("GPL");