Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/drivers/platform/x86/samsung-q10.c

  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 
 22 static acpi_handle ec_handle;
 23 
 24 static bool force;
 25 module_param(force, bool, 0);
 26 MODULE_PARM_DESC(force,
 27                 "Disable the DMI check and force the driver to be loaded");
 28 
 29 static 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 
 49 static const struct backlight_ops samsungq10_bl_ops = {
 50         .update_status  = samsungq10_bl_set_intensity,
 51 };
 52 
 53 static 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 
 72 static 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 
 82 static struct platform_driver samsungq10_driver = {
 83         .driver         = {
 84                 .name   = KBUILD_MODNAME,
 85         },
 86         .probe          = samsungq10_probe,
 87         .remove         = samsungq10_remove,
 88 };
 89 
 90 static struct platform_device *samsungq10_device;
 91 
 92 static 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 
 98 static 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 };
133 MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table);
134 
135 static 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 
152 static void __exit samsungq10_exit(void)
153 {
154         platform_device_unregister(samsungq10_device);
155         platform_driver_unregister(&samsungq10_driver);
156 }
157 
158 module_init(samsungq10_init);
159 module_exit(samsungq10_exit);
160 
161 MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>");
162 MODULE_DESCRIPTION("Samsung Q10 Driver");
163 MODULE_LICENSE("GPL");
164 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us