tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
32static struct pci_dev *pmu_dev = NULL;
33static struct pci_dev *sb_dev = NULL;
34
35static 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
49static 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
57static struct backlight_ops progearbl_ops = {
58 .get_brightness = progearbl_get_intensity,
59 .update_status = progearbl_set_intensity,
60};
61
62static int progearbl_probe(struct platform_device *pdev)
63{
64 u8 temp;
65 struct backlight_device *progear_backlight_device;
66
67 pmu_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, NULL);
68 if (!pmu_dev) {
69 printk("ALI M7101 PMU not found.\n");
70 return -ENODEV;
71 }
72
73 sb_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
74 if (!sb_dev) {
75 printk("ALI 1533 SB not found.\n");
76 pci_dev_put(pmu_dev);
77 return -ENODEV;
78 }
79
80 /* Set SB_MPS1 to enable brightness control. */
81 pci_read_config_byte(sb_dev, SB_MPS1, &temp);
82 pci_write_config_byte(sb_dev, SB_MPS1, temp | 0x20);
83
84 progear_backlight_device = backlight_device_register("progear-bl",
85 &pdev->dev, NULL,
86 &progearbl_ops);
87 if (IS_ERR(progear_backlight_device))
88 return PTR_ERR(progear_backlight_device);
89
90 platform_set_drvdata(pdev, progear_backlight_device);
91
92 progear_backlight_device->props.power = FB_BLANK_UNBLANK;
93 progear_backlight_device->props.brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
94 progear_backlight_device->props.max_brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
95 progearbl_set_intensity(progear_backlight_device);
96
97 return 0;
98}
99
100static int progearbl_remove(struct platform_device *pdev)
101{
102 struct backlight_device *bd = platform_get_drvdata(pdev);
103 backlight_device_unregister(bd);
104
105 return 0;
106}
107
108static struct platform_driver progearbl_driver = {
109 .probe = progearbl_probe,
110 .remove = progearbl_remove,
111 .driver = {
112 .name = "progear-bl",
113 },
114};
115
116static struct platform_device *progearbl_device;
117
118static int __init progearbl_init(void)
119{
120 int ret = platform_driver_register(&progearbl_driver);
121
122 if (ret)
123 return ret;
124 progearbl_device = platform_device_register_simple("progear-bl", -1,
125 NULL, 0);
126 if (IS_ERR(progearbl_device)) {
127 platform_driver_unregister(&progearbl_driver);
128 return PTR_ERR(progearbl_device);
129 }
130
131 return 0;
132}
133
134static void __exit progearbl_exit(void)
135{
136 pci_dev_put(pmu_dev);
137 pci_dev_put(sb_dev);
138
139 platform_device_unregister(progearbl_device);
140 platform_driver_unregister(&progearbl_driver);
141}
142
143module_init(progearbl_init);
144module_exit(progearbl_exit);
145
146MODULE_AUTHOR("Marcin Juszkiewicz <linux@hrw.one.pl>");
147MODULE_DESCRIPTION("ProGear Backlight Driver");
148MODULE_LICENSE("GPL");