Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / platform / x86 / samsung-q10.c

diff --git a/kernel/drivers/platform/x86/samsung-q10.c b/kernel/drivers/platform/x86/samsung-q10.c
new file mode 100644 (file)
index 0000000..e6aac72
--- /dev/null
+++ b/kernel/drivers/platform/x86/samsung-q10.c
@@ -0,0 +1,163 @@
+/*
+ *  Driver for Samsung Q10 and related laptops: controls the backlight
+ *
+ *  Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/backlight.h>
+#include <linux/dmi.h>
+#include <linux/acpi.h>
+
+#define SAMSUNGQ10_BL_MAX_INTENSITY 7
+
+static acpi_handle ec_handle;
+
+static bool force;
+module_param(force, bool, 0);
+MODULE_PARM_DESC(force,
+               "Disable the DMI check and force the driver to be loaded");
+
+static int samsungq10_bl_set_intensity(struct backlight_device *bd)
+{
+
+       acpi_status status;
+       int i;
+
+       for (i = 0; i < SAMSUNGQ10_BL_MAX_INTENSITY; i++) {
+               status = acpi_evaluate_object(ec_handle, "_Q63", NULL, NULL);
+               if (ACPI_FAILURE(status))
+                       return -EIO;
+       }
+       for (i = 0; i < bd->props.brightness; i++) {
+               status = acpi_evaluate_object(ec_handle, "_Q64", NULL, NULL);
+               if (ACPI_FAILURE(status))
+                       return -EIO;
+       }
+
+       return 0;
+}
+
+static const struct backlight_ops samsungq10_bl_ops = {
+       .update_status  = samsungq10_bl_set_intensity,
+};
+
+static int samsungq10_probe(struct platform_device *pdev)
+{
+
+       struct backlight_properties props;
+       struct backlight_device *bd;
+
+       memset(&props, 0, sizeof(struct backlight_properties));
+       props.type = BACKLIGHT_PLATFORM;
+       props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY;
+       bd = backlight_device_register("samsung", &pdev->dev, NULL,
+                                      &samsungq10_bl_ops, &props);
+       if (IS_ERR(bd))
+               return PTR_ERR(bd);
+
+       platform_set_drvdata(pdev, bd);
+
+       return 0;
+}
+
+static int samsungq10_remove(struct platform_device *pdev)
+{
+
+       struct backlight_device *bd = platform_get_drvdata(pdev);
+
+       backlight_device_unregister(bd);
+
+       return 0;
+}
+
+static struct platform_driver samsungq10_driver = {
+       .driver         = {
+               .name   = KBUILD_MODNAME,
+       },
+       .probe          = samsungq10_probe,
+       .remove         = samsungq10_remove,
+};
+
+static struct platform_device *samsungq10_device;
+
+static int __init dmi_check_callback(const struct dmi_system_id *id)
+{
+       printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident);
+       return 1;
+}
+
+static struct dmi_system_id __initdata samsungq10_dmi_table[] = {
+       {
+               .ident = "Samsung Q10",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "Samsung"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"),
+               },
+               .callback = dmi_check_callback,
+       },
+       {
+               .ident = "Samsung Q20",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"),
+               },
+               .callback = dmi_check_callback,
+       },
+       {
+               .ident = "Samsung Q25",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"),
+               },
+               .callback = dmi_check_callback,
+       },
+       {
+               .ident = "Dell Latitude X200",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "X200"),
+               },
+               .callback = dmi_check_callback,
+       },
+       { },
+};
+MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table);
+
+static int __init samsungq10_init(void)
+{
+       if (!force && !dmi_check_system(samsungq10_dmi_table))
+               return -ENODEV;
+
+       ec_handle = ec_get_handle();
+
+       if (!ec_handle)
+               return -ENODEV;
+
+       samsungq10_device = platform_create_bundle(&samsungq10_driver,
+                                                  samsungq10_probe,
+                                                  NULL, 0, NULL, 0);
+
+       return PTR_ERR_OR_ZERO(samsungq10_device);
+}
+
+static void __exit samsungq10_exit(void)
+{
+       platform_device_unregister(samsungq10_device);
+       platform_driver_unregister(&samsungq10_driver);
+}
+
+module_init(samsungq10_init);
+module_exit(samsungq10_exit);
+
+MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>");
+MODULE_DESCRIPTION("Samsung Q10 Driver");
+MODULE_LICENSE("GPL");