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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/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");