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
progearbl_set_intensity(struct backlight_device * bd)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
progearbl_get_intensity(struct backlight_device * bd)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
progearbl_probe(struct platform_device * pdev)62 static int progearbl_probe(struct platform_device *pdev)
63 {
64 struct backlight_properties props;
65 u8 temp;
66 struct backlight_device *progear_backlight_device;
67 int ret;
68
69 pmu_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, NULL);
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, NULL);
76 if (!sb_dev) {
77 printk("ALI 1533 SB not found.\n");
78 ret = -ENODEV;
79 goto put_pmu;
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 memset(&props, 0, sizeof(struct backlight_properties));
87 props.type = BACKLIGHT_RAW;
88 props.max_brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
89 progear_backlight_device = backlight_device_register("progear-bl",
90 &pdev->dev, NULL,
91 &progearbl_ops,
92 &props);
93 if (IS_ERR(progear_backlight_device)) {
94 ret = PTR_ERR(progear_backlight_device);
95 goto put_sb;
96 }
97
98 platform_set_drvdata(pdev, progear_backlight_device);
99
100 progear_backlight_device->props.power = FB_BLANK_UNBLANK;
101 progear_backlight_device->props.brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
102 progearbl_set_intensity(progear_backlight_device);
103
104 return 0;
105 put_sb:
106 pci_dev_put(sb_dev);
107 put_pmu:
108 pci_dev_put(pmu_dev);
109 return ret;
110 }
111
progearbl_remove(struct platform_device * pdev)112 static int progearbl_remove(struct platform_device *pdev)
113 {
114 struct backlight_device *bd = platform_get_drvdata(pdev);
115 backlight_device_unregister(bd);
116
117 return 0;
118 }
119
120 static struct platform_driver progearbl_driver = {
121 .probe = progearbl_probe,
122 .remove = progearbl_remove,
123 .driver = {
124 .name = "progear-bl",
125 },
126 };
127
128 static struct platform_device *progearbl_device;
129
progearbl_init(void)130 static int __init progearbl_init(void)
131 {
132 int ret = platform_driver_register(&progearbl_driver);
133
134 if (ret)
135 return ret;
136 progearbl_device = platform_device_register_simple("progear-bl", -1,
137 NULL, 0);
138 if (IS_ERR(progearbl_device)) {
139 platform_driver_unregister(&progearbl_driver);
140 return PTR_ERR(progearbl_device);
141 }
142
143 return 0;
144 }
145
progearbl_exit(void)146 static void __exit progearbl_exit(void)
147 {
148 pci_dev_put(pmu_dev);
149 pci_dev_put(sb_dev);
150
151 platform_device_unregister(progearbl_device);
152 platform_driver_unregister(&progearbl_driver);
153 }
154
155 module_init(progearbl_init);
156 module_exit(progearbl_exit);
157
158 MODULE_AUTHOR("Marcin Juszkiewicz <linux@hrw.one.pl>");
159 MODULE_DESCRIPTION("ProGear Backlight Driver");
160 MODULE_LICENSE("GPL");
161