Platform: Samsung Q10 backlight driver (78542e18) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/platform/x86/Kconfig

+8 −0

Original line number	Original line	Diff line number	Diff line
	@@ -769,4 +769,12 @@ config INTEL_OAKTRAIL
	enable/disable the Camera, WiFi, BT etc. devices. If in doubt, say Y		enable/disable the Camera, WiFi, BT etc. devices. If in doubt, say Y
	here; it will only load on supported platforms.		here; it will only load on supported platforms.

			config SAMSUNG_Q10
			tristate "Samsung Q10 Extras"
			depends on SERIO_I8042
			select BACKLIGHT_CLASS_DEVICE
			---help---
			This driver provides support for backlight control on Samsung Q10
			and related laptops, including Dell Latitude X200.

	endif # X86_PLATFORM_DEVICES		endif # X86_PLATFORM_DEVICES

drivers/platform/x86/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -44,3 +44,4 @@ obj-$(CONFIG_SAMSUNG_LAPTOP) += samsung-laptop.o
	obj-$(CONFIG_MXM_WMI) += mxm-wmi.o		obj-$(CONFIG_MXM_WMI) += mxm-wmi.o
	obj-$(CONFIG_INTEL_MID_POWER_BUTTON) += intel_mid_powerbtn.o		obj-$(CONFIG_INTEL_MID_POWER_BUTTON) += intel_mid_powerbtn.o
	obj-$(CONFIG_INTEL_OAKTRAIL) += intel_oaktrail.o		obj-$(CONFIG_INTEL_OAKTRAIL) += intel_oaktrail.o
			obj-$(CONFIG_SAMSUNG_Q10) += samsung-q10.o

drivers/platform/x86/samsung-q10.c

0 → 100644

+196 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* 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/i8042.h>
			#include <linux/dmi.h>

			#define SAMSUNGQ10_BL_MAX_INTENSITY 255
			#define SAMSUNGQ10_BL_DEFAULT_INTENSITY 185

			#define SAMSUNGQ10_BL_8042_CMD 0xbe
			#define SAMSUNGQ10_BL_8042_DATA { 0x89, 0x91 }

			static int samsungq10_bl_brightness;

			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)
			{

			int brightness = bd->props.brightness;
			unsigned char c[3] = SAMSUNGQ10_BL_8042_DATA;

			c[2] = (unsigned char)brightness;
			i8042_lock_chip();
			i8042_command(c, (0x30 << 8) \| SAMSUNGQ10_BL_8042_CMD);
			i8042_unlock_chip();
			samsungq10_bl_brightness = brightness;

			return 0;
			}

			static int samsungq10_bl_get_intensity(struct backlight_device *bd)
			{
			return samsungq10_bl_brightness;
			}

			static const struct backlight_ops samsungq10_bl_ops = {
			.get_brightness = samsungq10_bl_get_intensity,
			.update_status = samsungq10_bl_set_intensity,
			};

			#ifdef CONFIG_PM_SLEEP
			static int samsungq10_suspend(struct device *dev)
			{
			return 0;
			}

			static int samsungq10_resume(struct device *dev)
			{

			struct backlight_device *bd = dev_get_drvdata(dev);

			samsungq10_bl_set_intensity(bd);
			return 0;
			}
			#else
			#define samsungq10_suspend NULL
			#define samsungq10_resume NULL
			#endif

			static SIMPLE_DEV_PM_OPS(samsungq10_pm_ops,
			samsungq10_suspend, samsungq10_resume);

			static int __devinit 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);

			bd->props.brightness = SAMSUNGQ10_BL_DEFAULT_INTENSITY;
			samsungq10_bl_set_intensity(bd);

			return 0;
			}

			static int __devexit samsungq10_remove(struct platform_device *pdev)
			{

			struct backlight_device *bd = platform_get_drvdata(pdev);

			bd->props.brightness = SAMSUNGQ10_BL_DEFAULT_INTENSITY;
			samsungq10_bl_set_intensity(bd);

			backlight_device_unregister(bd);

			return 0;
			}

			static struct platform_driver samsungq10_driver = {
			.driver = {
			.name = KBUILD_MODNAME,
			.owner = THIS_MODULE,
			.pm = &samsungq10_pm_ops,
			},
			.probe = samsungq10_probe,
			.remove = __devexit_p(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 0;
			}

			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;

			samsungq10_device = platform_create_bundle(&samsungq10_driver,
			samsungq10_probe,
			NULL, 0, NULL, 0);

			if (IS_ERR(samsungq10_device))
			return PTR_ERR(samsungq10_device);

			return 0;
			}

			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");