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