path: root/drivers/platform/x86/fujitsu-laptop.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*-*-linux-c-*-*/

/*
  Copyright (C) 2007,2008 Jonathan Woithe <jwoithe@just42.net>
  Copyright (C) 2008 Peter Gruber <nokos@gmx.net>
  Copyright (C) 2008 Tony Vroon <tony@linx.net>
  Based on earlier work:
    Copyright (C) 2003 Shane Spencer <shane@bogomip.com>
    Adrian Yee <brewt-fujitsu@brewt.org>

  Templated from msi-laptop.c and thinkpad_acpi.c which is copyright
  by its respective authors.

 */

/*
 * fujitsu-laptop.c - Fujitsu laptop support, providing access to additional
 * features made available on a range of Fujitsu laptops including the
 * P2xxx/P5xxx/S6xxx/S7xxx series.
 *
 * This driver implements a vendor-specific backlight control interface for
 * Fujitsu laptops and provides support for hotkeys present on certain Fujitsu
 * laptops.
 *
 * This driver has been tested on a Fujitsu Lifebook S6410, S7020 and
 * P8010.  It should work on most P-series and S-series Lifebooks, but
 * YMMV.
 *
 * The module parameter use_alt_lcd_levels switches between different ACPI
 * brightness controls which are used by different Fujitsu laptops.  In most
 * cases the correct method is automatically detected. "use_alt_lcd_levels=1"
 * is applicable for a Fujitsu Lifebook S6410 if autodetection fails.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/bitops.h>
#include <linux/dmi.h>
#include <linux/backlight.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/kfifo.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <acpi/battery.h>
#include <acpi/video.h>

#define FUJITSU_DRIVER_VERSION		"0.6.0"

#define FUJITSU_LCD_N_LEVELS		8

#define ACPI_FUJITSU_CLASS		"fujitsu"
#define ACPI_FUJITSU_BL_HID		"FUJ02B1"
#define ACPI_FUJITSU_BL_DRIVER_NAME	"Fujitsu laptop FUJ02B1 ACPI brightness driver"
#define ACPI_FUJITSU_BL_DEVICE_NAME	"Fujitsu FUJ02B1"
#define ACPI_FUJITSU_LAPTOP_HID		"FUJ02E3"
#define ACPI_FUJITSU_LAPTOP_DRIVER_NAME	"Fujitsu laptop FUJ02E3 ACPI hotkeys driver"
#define ACPI_FUJITSU_LAPTOP_DEVICE_NAME	"Fujitsu FUJ02E3"

#define ACPI_FUJITSU_NOTIFY_CODE	0x80

/* FUNC interface - command values */
#define FUNC_FLAGS			BIT(12)
#define FUNC_LEDS			(BIT(12) | BIT(0))
#define FUNC_BUTTONS			(BIT(12) | BIT(1))
#define FUNC_BACKLIGHT			(BIT(12) | BIT(2))

/* FUNC interface - responses */
#define UNSUPPORTED_CMD			0x80000000

/* FUNC interface - status flags */
#define FLAG_RFKILL			BIT(5)
#define FLAG_LID			BIT(8)
#define FLAG_DOCK			BIT(9)
#define FLAG_TOUCHPAD_TOGGLE		BIT(26)
#define FLAG_MICMUTE			BIT(29)
#define FLAG_SOFTKEYS			(FLAG_RFKILL | FLAG_TOUCHPAD_TOGGLE | FLAG_MICMUTE)

/* FUNC interface - LED control */
#define FUNC_LED_OFF			BIT(0)
#define FUNC_LED_ON			(BIT(0) | BIT(16) | BIT(17))
#define LOGOLAMP_POWERON		BIT(13)
#define LOGOLAMP_ALWAYS			BIT(14)
#define KEYBOARD_LAMPS			BIT(8)
#define RADIO_LED_ON			BIT(5)
#define ECO_LED				BIT(16)
#define ECO_LED_ON			BIT(19)

/* FUNC interface - backlight power control */
#define BACKLIGHT_PARAM_POWER		BIT(2)
#define BACKLIGHT_OFF			(BIT(0) | BIT(1))
#define BACKLIGHT_ON			0

/* FUNC interface - battery control interface */
#define FUNC_S006_METHOD		0x1006
#define CHARGE_CONTROL_RW		0x21

/* Scancodes read from the GIRB register */
#define KEY1_CODE			0x410
#define KEY2_CODE			0x411
#define KEY3_CODE			0x412
#define KEY4_CODE			0x413
#define KEY5_CODE			0x420

/* Hotkey ringbuffer limits */
#define MAX_HOTKEY_RINGBUFFER_SIZE	100
#define RINGBUFFERSIZE			40

/* Module parameters */
static int use_alt_lcd_levels = -1;
static bool disable_brightness_adjust;

/* Device controlling the backlight and associated keys */
struct fujitsu_bl {
	struct input_dev *input;
	char phys[32];
	struct backlight_device *bl_device;
	unsigned int max_brightness;
	unsigned int brightness_level;
};

static struct fujitsu_bl *fujitsu_bl;

/* Device used to access hotkeys and other features on the laptop */
struct fujitsu_laptop {
	struct input_dev *input;
	char phys[32];
	struct platform_device *pf_device;
	struct kfifo fifo;
	spinlock_t fifo_lock;
	int flags_supported;
	int flags_state;
	bool charge_control_supported;
};

static struct acpi_device *fext;

/* Fujitsu ACPI interface function */

static int call_fext_func(struct acpi_device *device,
			  int func, int op, int feature, int state)
{
	union acpi_object params[4] = {
		{ .integer.type = ACPI_TYPE_INTEGER, .integer.value = func },
		{ .integer.type = ACPI_TYPE_INTEGER, .integer.value = op },
		{ .integer.type = ACPI_TYPE_INTEGER, .integer.value = feature },
		{ .integer.type = ACPI_TYPE_INTEGER, .integer.value = state }
	};
	struct acpi_object_list arg_list = { 4, params };
	unsigned long long value;
	acpi_status status;

	status = acpi_evaluate_integer(device->handle, "FUNC", &arg_list,
				       &value);
	if (ACPI_FAILURE(status)) {
		acpi_handle_err(device->handle, "Failed to evaluate FUNC\n");
		return -ENODEV;
	}

	acpi_handle_debug(device->handle,
			  "FUNC 0x%x (args 0x%x, 0x%x, 0x%x) returned 0x%x\n",
			  func, op, feature, state, (int)value);
	return value;
}

/* Battery charge control code */
static ssize_t charge_control_end_threshold_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	int cc_end_value, s006_cc_return;
	int value, ret;

	ret = kstrtouint(buf, 10, &value);
	if (ret)
		return ret;

	if (value < 50 || value > 100)
		return -EINVAL;

	cc_end_value = value * 0x100 + 0x20;
	s006_cc_return = call_fext_func(fext, FUNC_S006_METHOD,
					CHARGE_CONTROL_RW, cc_end_value, 0x0);
	if (s006_cc_return < 0)
		return s006_cc_return;
	/*
	 * The S006 0x21 method returns 0x00 in case the provided value
	 * is invalid.
	 */
	if (s006_cc_return == 0x00)
		return -EINVAL