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
33static struct pci_dev *pmu_dev = NULL;
34static struct pci_dev *sb_dev = NULL;
35
36static 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
50static 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
58static struct backlight_ops progearbl_ops = {
59	.get_brightness = progearbl_get_intensity,
60	.update_status = progearbl_set_intensity,
61};
62
63static int progearbl_probe(struct platform_device *pdev)
64{
65	u8 temp;
66	struct backlight_device *progear_backlight_device;
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		pci_dev_put(pmu_dev);
78		return -ENODEV;
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		return PTR_ERR(progear_backlight_device);
90
91	platform_set_drvdata(pdev, progear_backlight_device);
92
93	progear_backlight_device->props.power = FB_BLANK_UNBLANK;
94	progear_backlight_device->props.brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
95	progear_backlight_device->props.max_brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
96	progearbl_set_intensity(progear_backlight_device);
97
98	return 0;
99}
100
101static int progearbl_remove(struct platform_device *pdev)
102{
103	struct backlight_device *bd = platform_get_drvdata(pdev);
104	backlight_device_unregister(bd);
105
106	return 0;
107}
108
109static struct platform_driver progearbl_driver = {
110	.probe = progearbl_probe,
111	.remove = progearbl_remove,
112	.driver = {
113		   .name = "progear-bl",
114		   },
115};
116
117static struct platform_device *progearbl_device;
118
119static int __init progearbl_init(void)
120{
121	int ret = platform_driver_register(&progearbl_driver);
122
123	if (!ret) {
124		progearbl_device = platform_device_alloc("progear-bl", -1);
125		if (!progearbl_device)
126			return -ENOMEM;
127
128		ret = platform_device_add(progearbl_device);
129
130		if (ret) {
131			platform_device_put(progearbl_device);
132			platform_driver_unregister(&progearbl_driver);
133		}
134	}
135
136	return ret;
137}
138
139static void __exit progearbl_exit(void)
140{
141	pci_dev_put(pmu_dev);
142	pci_dev_put(sb_dev);
143
144	platform_device_unregister(progearbl_device);
145	platform_driver_unregister(&progearbl_driver);
146}
147
148module_init(progearbl_init);
149module_exit(progearbl_exit);
150
151MODULE_AUTHOR("Marcin Juszkiewicz <linux@hrw.one.pl>");
152MODULE_DESCRIPTION("ProGear Backlight Driver");
153MODULE_LICENSE("GPL");
154