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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for Samsung Q10 and related laptops: controls the backlight
4 *
5 * Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com>
6 */
7
8#include <linux/module.h>
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/platform_device.h>
12#include <linux/backlight.h>
13#include <linux/dmi.h>
14#include <linux/acpi.h>
15
16#define SAMSUNGQ10_BL_MAX_INTENSITY 7
17
18static acpi_handle ec_handle;
19
20static bool force;
21module_param(force, bool, 0);
22MODULE_PARM_DESC(force,
23 "Disable the DMI check and force the driver to be loaded");
24
25static int samsungq10_bl_set_intensity(struct backlight_device *bd)
26{
27
28 acpi_status status;
29 int i;
30
31 for (i = 0; i < SAMSUNGQ10_BL_MAX_INTENSITY; i++) {
32 status = acpi_evaluate_object(ec_handle, "_Q63", NULL, NULL);
33 if (ACPI_FAILURE(status))
34 return -EIO;
35 }
36 for (i = 0; i < bd->props.brightness; i++) {
37 status = acpi_evaluate_object(ec_handle, "_Q64", NULL, NULL);
38 if (ACPI_FAILURE(status))
39 return -EIO;
40 }
41
42 return 0;
43}
44
45static const struct backlight_ops samsungq10_bl_ops = {
46 .update_status = samsungq10_bl_set_intensity,
47};
48
49static int samsungq10_probe(struct platform_device *pdev)
50{
51
52 struct backlight_properties props;
53 struct backlight_device *bd;
54
55 memset(&props, 0, sizeof(struct backlight_properties));
56 props.type = BACKLIGHT_PLATFORM;
57 props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY;
58 bd = backlight_device_register("samsung", &pdev->dev, NULL,
59 &samsungq10_bl_ops, &props);
60 if (IS_ERR(bd))
61 return PTR_ERR(bd);
62
63 platform_set_drvdata(pdev, bd);
64
65 return 0;
66}
67
68static int samsungq10_remove(struct platform_device *pdev)
69{
70
71 struct backlight_device *bd = platform_get_drvdata(pdev);
72
73 backlight_device_unregister(bd);
74
75 return 0;
76}
77
78static struct platform_driver samsungq10_driver = {
79 .driver = {
80 .name = KBUILD_MODNAME,
81 },
82 .probe = samsungq10_probe,
83 .remove = samsungq10_remove,
84};
85
86static struct platform_device *samsungq10_device;
87
88static int __init dmi_check_callback(const struct dmi_system_id *id)
89{
90 printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident);
91 return 1;
92}
93
94static const struct dmi_system_id samsungq10_dmi_table[] __initconst = {
95 {
96 .ident = "Samsung Q10",
97 .matches = {
98 DMI_MATCH(DMI_SYS_VENDOR, "Samsung"),
99 DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"),
100 },
101 .callback = dmi_check_callback,
102 },
103 {
104 .ident = "Samsung Q20",
105 .matches = {
106 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
107 DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"),
108 },
109 .callback = dmi_check_callback,
110 },
111 {
112 .ident = "Samsung Q25",
113 .matches = {
114 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
115 DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"),
116 },
117 .callback = dmi_check_callback,
118 },
119 {
120 .ident = "Dell Latitude X200",
121 .matches = {
122 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
123 DMI_MATCH(DMI_PRODUCT_NAME, "X200"),
124 },
125 .callback = dmi_check_callback,
126 },
127 { },
128};
129MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table);
130
131static int __init samsungq10_init(void)
132{
133 if (!force && !dmi_check_system(samsungq10_dmi_table))
134 return -ENODEV;
135
136 ec_handle = ec_get_handle();
137
138 if (!ec_handle)
139 return -ENODEV;
140
141 samsungq10_device = platform_create_bundle(&samsungq10_driver,
142 samsungq10_probe,
143 NULL, 0, NULL, 0);
144
145 return PTR_ERR_OR_ZERO(samsungq10_device);
146}
147
148static void __exit samsungq10_exit(void)
149{
150 platform_device_unregister(samsungq10_device);
151 platform_driver_unregister(&samsungq10_driver);
152}
153
154module_init(samsungq10_init);
155module_exit(samsungq10_exit);
156
157MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>");
158MODULE_DESCRIPTION("Samsung Q10 Driver");
159MODULE_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");