cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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samsung-q10.c (3669B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  Driver for Samsung Q10 and related laptops: controls the backlight
      4 *
      5 *  Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com>
      6 */
      7
      8#include <linux/module.h>
      9#include <linux/kernel.h>
     10#include <linux/init.h>
     11#include <linux/platform_device.h>
     12#include <linux/backlight.h>
     13#include <linux/dmi.h>
     14#include <linux/acpi.h>
     15
     16#define SAMSUNGQ10_BL_MAX_INTENSITY 7
     17
     18static acpi_handle ec_handle;
     19
     20static bool force;
     21module_param(force, bool, 0);
     22MODULE_PARM_DESC(force,
     23		"Disable the DMI check and force the driver to be loaded");
     24
     25static int samsungq10_bl_set_intensity(struct backlight_device *bd)
     26{
     27
     28	acpi_status status;
     29	int i;
     30
     31	for (i = 0; i < SAMSUNGQ10_BL_MAX_INTENSITY; i++) {
     32		status = acpi_evaluate_object(ec_handle, "_Q63", NULL, NULL);
     33		if (ACPI_FAILURE(status))
     34			return -EIO;
     35	}
     36	for (i = 0; i < bd->props.brightness; i++) {
     37		status = acpi_evaluate_object(ec_handle, "_Q64", NULL, NULL);
     38		if (ACPI_FAILURE(status))
     39			return -EIO;
     40	}
     41
     42	return 0;
     43}
     44
     45static const struct backlight_ops samsungq10_bl_ops = {
     46	.update_status	= samsungq10_bl_set_intensity,
     47};
     48
     49static int samsungq10_probe(struct platform_device *pdev)
     50{
     51
     52	struct backlight_properties props;
     53	struct backlight_device *bd;
     54
     55	memset(&props, 0, sizeof(struct backlight_properties));
     56	props.type = BACKLIGHT_PLATFORM;
     57	props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY;
     58	bd = backlight_device_register("samsung", &pdev->dev, NULL,
     59				       &samsungq10_bl_ops, &props);
     60	if (IS_ERR(bd))
     61		return PTR_ERR(bd);
     62
     63	platform_set_drvdata(pdev, bd);
     64
     65	return 0;
     66}
     67
     68static int samsungq10_remove(struct platform_device *pdev)
     69{
     70
     71	struct backlight_device *bd = platform_get_drvdata(pdev);
     72
     73	backlight_device_unregister(bd);
     74
     75	return 0;
     76}
     77
     78static struct platform_driver samsungq10_driver = {
     79	.driver		= {
     80		.name	= KBUILD_MODNAME,
     81	},
     82	.probe		= samsungq10_probe,
     83	.remove		= samsungq10_remove,
     84};
     85
     86static struct platform_device *samsungq10_device;
     87
     88static int __init dmi_check_callback(const struct dmi_system_id *id)
     89{
     90	printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident);
     91	return 1;
     92}
     93
     94static const struct dmi_system_id samsungq10_dmi_table[] __initconst = {
     95	{
     96		.ident = "Samsung Q10",
     97		.matches = {
     98			DMI_MATCH(DMI_SYS_VENDOR, "Samsung"),
     99			DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"),
    100		},
    101		.callback = dmi_check_callback,
    102	},
    103	{
    104		.ident = "Samsung Q20",
    105		.matches = {
    106			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
    107			DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"),
    108		},
    109		.callback = dmi_check_callback,
    110	},
    111	{
    112		.ident = "Samsung Q25",
    113		.matches = {
    114			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
    115			DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"),
    116		},
    117		.callback = dmi_check_callback,
    118	},
    119	{
    120		.ident = "Dell Latitude X200",
    121		.matches = {
    122			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
    123			DMI_MATCH(DMI_PRODUCT_NAME, "X200"),
    124		},
    125		.callback = dmi_check_callback,
    126	},
    127	{ },
    128};
    129MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table);
    130
    131static int __init samsungq10_init(void)
    132{
    133	if (!force && !dmi_check_system(samsungq10_dmi_table))
    134		return -ENODEV;
    135
    136	ec_handle = ec_get_handle();
    137
    138	if (!ec_handle)
    139		return -ENODEV;
    140
    141	samsungq10_device = platform_create_bundle(&samsungq10_driver,
    142						   samsungq10_probe,
    143						   NULL, 0, NULL, 0);
    144
    145	return PTR_ERR_OR_ZERO(samsungq10_device);
    146}
    147
    148static void __exit samsungq10_exit(void)
    149{
    150	platform_device_unregister(samsungq10_device);
    151	platform_driver_unregister(&samsungq10_driver);
    152}
    153
    154module_init(samsungq10_init);
    155module_exit(samsungq10_exit);
    156
    157MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>");
    158MODULE_DESCRIPTION("Samsung Q10 Driver");
    159MODULE_LICENSE("GPL");