![Lv Zheng](/assets/img/avatar_default.png)
Replace direct inclusions of <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h>, which are incorrect, with <linux/acpi.h> inclusions and remove some inclusions of those files that aren't necessary. First of all, <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h> should not be included directly from any files that are built for CONFIG_ACPI unset, because that generally leads to build warnings about undefined symbols in !CONFIG_ACPI builds. For CONFIG_ACPI set, <linux/acpi.h> includes those files and for CONFIG_ACPI unset it provides stub ACPI symbols to be used in that case. Second, there are ordering dependencies between those files that always have to be met. Namely, it is required that <acpi/acpi_bus.h> be included prior to <acpi/acpi_drivers.h> so that the acpi_pci_root declarations the latter depends on are always there. And <acpi/acpi.h> which provides basic ACPICA type declarations should always be included prior to any other ACPI headers in CONFIG_ACPI builds. That also is taken care of including <linux/acpi.h> as appropriate. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Tony Luck <tony.luck@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> (drivers/pci stuff) Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> (Xen stuff) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
171 lines
3.9 KiB
C
171 lines
3.9 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 int samsungq10_bl_get_intensity(struct backlight_device *bd)
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{
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return bd->props.brightness;
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}
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static const struct backlight_ops samsungq10_bl_ops = {
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.get_brightness = samsungq10_bl_get_intensity,
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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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.owner = THIS_MODULE,
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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 struct dmi_system_id __initdata samsungq10_dmi_table[] = {
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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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