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159 lines
3.6 KiB
159 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Samsung Q10 Driver"); |
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MODULE_LICENSE("GPL");
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