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1/*
2 * Driver for Samsung Q10 and related laptops: controls the backlight
3 *
4 * Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/platform_device.h>
16#include <linux/backlight.h>
17#include <linux/i8042.h>
18#include <linux/dmi.h>
19
20#define SAMSUNGQ10_BL_MAX_INTENSITY 255
21#define SAMSUNGQ10_BL_DEFAULT_INTENSITY 185
22
23#define SAMSUNGQ10_BL_8042_CMD 0xbe
24#define SAMSUNGQ10_BL_8042_DATA { 0x89, 0x91 }
25
26static int samsungq10_bl_brightness;
27
28static bool force;
29module_param(force, bool, 0);
30MODULE_PARM_DESC(force,
31 "Disable the DMI check and force the driver to be loaded");
32
33static int samsungq10_bl_set_intensity(struct backlight_device *bd)
34{
35
36 int brightness = bd->props.brightness;
37 unsigned char c[3] = SAMSUNGQ10_BL_8042_DATA;
38
39 c[2] = (unsigned char)brightness;
40 i8042_lock_chip();
41 i8042_command(c, (0x30 << 8) | SAMSUNGQ10_BL_8042_CMD);
42 i8042_unlock_chip();
43 samsungq10_bl_brightness = brightness;
44
45 return 0;
46}
47
48static int samsungq10_bl_get_intensity(struct backlight_device *bd)
49{
50 return samsungq10_bl_brightness;
51}
52
53static const struct backlight_ops samsungq10_bl_ops = {
54 .get_brightness = samsungq10_bl_get_intensity,
55 .update_status = samsungq10_bl_set_intensity,
56};
57
58#ifdef CONFIG_PM_SLEEP
59static int samsungq10_suspend(struct device *dev)
60{
61 return 0;
62}
63
64static int samsungq10_resume(struct device *dev)
65{
66
67 struct backlight_device *bd = dev_get_drvdata(dev);
68
69 samsungq10_bl_set_intensity(bd);
70 return 0;
71}
72#else
73#define samsungq10_suspend NULL
74#define samsungq10_resume NULL
75#endif
76
77static SIMPLE_DEV_PM_OPS(samsungq10_pm_ops,
78 samsungq10_suspend, samsungq10_resume);
79
80static int __devinit samsungq10_probe(struct platform_device *pdev)
81{
82
83 struct backlight_properties props;
84 struct backlight_device *bd;
85
86 memset(&props, 0, sizeof(struct backlight_properties));
87 props.type = BACKLIGHT_PLATFORM;
88 props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY;
89 bd = backlight_device_register("samsung", &pdev->dev, NULL,
90 &samsungq10_bl_ops, &props);
91 if (IS_ERR(bd))
92 return PTR_ERR(bd);
93
94 platform_set_drvdata(pdev, bd);
95
96 bd->props.brightness = SAMSUNGQ10_BL_DEFAULT_INTENSITY;
97 samsungq10_bl_set_intensity(bd);
98
99 return 0;
100}
101
102static int __devexit samsungq10_remove(struct platform_device *pdev)
103{
104
105 struct backlight_device *bd = platform_get_drvdata(pdev);
106
107 bd->props.brightness = SAMSUNGQ10_BL_DEFAULT_INTENSITY;
108 samsungq10_bl_set_intensity(bd);
109
110 backlight_device_unregister(bd);
111
112 return 0;
113}
114
115static struct platform_driver samsungq10_driver = {
116 .driver = {
117 .name = KBUILD_MODNAME,
118 .owner = THIS_MODULE,
119 .pm = &samsungq10_pm_ops,
120 },
121 .probe = samsungq10_probe,
122 .remove = __devexit_p(samsungq10_remove),
123};
124
125static struct platform_device *samsungq10_device;
126
127static int __init dmi_check_callback(const struct dmi_system_id *id)
128{
129 printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident);
130 return 1;
131}
132
133static struct dmi_system_id __initdata samsungq10_dmi_table[] = {
134 {
135 .ident = "Samsung Q10",
136 .matches = {
137 DMI_MATCH(DMI_SYS_VENDOR, "Samsung"),
138 DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"),
139 },
140 .callback = dmi_check_callback,
141 },
142 {
143 .ident = "Samsung Q20",
144 .matches = {
145 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
146 DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"),
147 },
148 .callback = dmi_check_callback,
149 },
150 {
151 .ident = "Samsung Q25",
152 .matches = {
153 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
154 DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"),
155 },
156 .callback = dmi_check_callback,
157 },
158 {
159 .ident = "Dell Latitude X200",
160 .matches = {
161 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
162 DMI_MATCH(DMI_PRODUCT_NAME, "X200"),
163 },
164 .callback = dmi_check_callback,
165 },
166 { },
167};
168MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table);
169
170static int __init samsungq10_init(void)
171{
172 if (!force && !dmi_check_system(samsungq10_dmi_table))
173 return -ENODEV;
174
175 samsungq10_device = platform_create_bundle(&samsungq10_driver,
176 samsungq10_probe,
177 NULL, 0, NULL, 0);
178
179 if (IS_ERR(samsungq10_device))
180 return PTR_ERR(samsungq10_device);
181
182 return 0;
183}
184
185static void __exit samsungq10_exit(void)
186{
187 platform_device_unregister(samsungq10_device);
188 platform_driver_unregister(&samsungq10_driver);
189}
190
191module_init(samsungq10_init);
192module_exit(samsungq10_exit);
193
194MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>");
195MODULE_DESCRIPTION("Samsung Q10 Driver");
196MODULE_LICENSE("GPL");
1/*
2 * Driver for Samsung Q10 and related laptops: controls the backlight
3 *
4 * Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/platform_device.h>
16#include <linux/backlight.h>
17#include <linux/dmi.h>
18#include <linux/acpi.h>
19
20#define SAMSUNGQ10_BL_MAX_INTENSITY 7
21
22static acpi_handle ec_handle;
23
24static bool force;
25module_param(force, bool, 0);
26MODULE_PARM_DESC(force,
27 "Disable the DMI check and force the driver to be loaded");
28
29static int samsungq10_bl_set_intensity(struct backlight_device *bd)
30{
31
32 acpi_status status;
33 int i;
34
35 for (i = 0; i < SAMSUNGQ10_BL_MAX_INTENSITY; i++) {
36 status = acpi_evaluate_object(ec_handle, "_Q63", NULL, NULL);
37 if (ACPI_FAILURE(status))
38 return -EIO;
39 }
40 for (i = 0; i < bd->props.brightness; i++) {
41 status = acpi_evaluate_object(ec_handle, "_Q64", NULL, NULL);
42 if (ACPI_FAILURE(status))
43 return -EIO;
44 }
45
46 return 0;
47}
48
49static const struct backlight_ops samsungq10_bl_ops = {
50 .update_status = samsungq10_bl_set_intensity,
51};
52
53static int samsungq10_probe(struct platform_device *pdev)
54{
55
56 struct backlight_properties props;
57 struct backlight_device *bd;
58
59 memset(&props, 0, sizeof(struct backlight_properties));
60 props.type = BACKLIGHT_PLATFORM;
61 props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY;
62 bd = backlight_device_register("samsung", &pdev->dev, NULL,
63 &samsungq10_bl_ops, &props);
64 if (IS_ERR(bd))
65 return PTR_ERR(bd);
66
67 platform_set_drvdata(pdev, bd);
68
69 return 0;
70}
71
72static int samsungq10_remove(struct platform_device *pdev)
73{
74
75 struct backlight_device *bd = platform_get_drvdata(pdev);
76
77 backlight_device_unregister(bd);
78
79 return 0;
80}
81
82static struct platform_driver samsungq10_driver = {
83 .driver = {
84 .name = KBUILD_MODNAME,
85 },
86 .probe = samsungq10_probe,
87 .remove = samsungq10_remove,
88};
89
90static struct platform_device *samsungq10_device;
91
92static int __init dmi_check_callback(const struct dmi_system_id *id)
93{
94 printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident);
95 return 1;
96}
97
98static struct dmi_system_id __initdata samsungq10_dmi_table[] = {
99 {
100 .ident = "Samsung Q10",
101 .matches = {
102 DMI_MATCH(DMI_SYS_VENDOR, "Samsung"),
103 DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"),
104 },
105 .callback = dmi_check_callback,
106 },
107 {
108 .ident = "Samsung Q20",
109 .matches = {
110 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
111 DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"),
112 },
113 .callback = dmi_check_callback,
114 },
115 {
116 .ident = "Samsung Q25",
117 .matches = {
118 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
119 DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"),
120 },
121 .callback = dmi_check_callback,
122 },
123 {
124 .ident = "Dell Latitude X200",
125 .matches = {
126 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
127 DMI_MATCH(DMI_PRODUCT_NAME, "X200"),
128 },
129 .callback = dmi_check_callback,
130 },
131 { },
132};
133MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table);
134
135static int __init samsungq10_init(void)
136{
137 if (!force && !dmi_check_system(samsungq10_dmi_table))
138 return -ENODEV;
139
140 ec_handle = ec_get_handle();
141
142 if (!ec_handle)
143 return -ENODEV;
144
145 samsungq10_device = platform_create_bundle(&samsungq10_driver,
146 samsungq10_probe,
147 NULL, 0, NULL, 0);
148
149 return PTR_ERR_OR_ZERO(samsungq10_device);
150}
151
152static void __exit samsungq10_exit(void)
153{
154 platform_device_unregister(samsungq10_device);
155 platform_driver_unregister(&samsungq10_driver);
156}
157
158module_init(samsungq10_init);
159module_exit(samsungq10_exit);
160
161MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>");
162MODULE_DESCRIPTION("Samsung Q10 Driver");
163MODULE_LICENSE("GPL");