2ec16deb2397763d34003a0ba9a491a57deb7fd5
[linux-2.6.git] / 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");