hid-lg4ff.c 41.1 KB
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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 *  Force feedback support for Logitech Gaming Wheels
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 *
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 *  Including G27, G25, DFP, DFGT, FFEX, Momo, Momo2 &
 *  Speed Force Wireless (WiiWheel)
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 *
 *  Copyright (c) 2010 Simon Wood <simon@mungewell.org>
 */

/*
 */


#include <linux/input.h>
#include <linux/usb.h>
#include <linux/hid.h>

#include "usbhid/usbhid.h"
#include "hid-lg.h"
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#include "hid-lg4ff.h"
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#include "hid-ids.h"
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#define LG4FF_MMODE_IS_MULTIMODE 0
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#define LG4FF_MMODE_SWITCHED 1
#define LG4FF_MMODE_NOT_MULTIMODE 2

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#define LG4FF_MODE_NATIVE_IDX 0
#define LG4FF_MODE_DFEX_IDX 1
#define LG4FF_MODE_DFP_IDX 2
#define LG4FF_MODE_G25_IDX 3
#define LG4FF_MODE_DFGT_IDX 4
#define LG4FF_MODE_G27_IDX 5
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#define LG4FF_MODE_G29_IDX 6
#define LG4FF_MODE_MAX_IDX 7
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#define LG4FF_MODE_NATIVE BIT(LG4FF_MODE_NATIVE_IDX)
#define LG4FF_MODE_DFEX BIT(LG4FF_MODE_DFEX_IDX)
#define LG4FF_MODE_DFP BIT(LG4FF_MODE_DFP_IDX)
#define LG4FF_MODE_G25 BIT(LG4FF_MODE_G25_IDX)
#define LG4FF_MODE_DFGT BIT(LG4FF_MODE_DFGT_IDX)
#define LG4FF_MODE_G27 BIT(LG4FF_MODE_G27_IDX)
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#define LG4FF_MODE_G29 BIT(LG4FF_MODE_G29_IDX)
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#define LG4FF_DFEX_TAG "DF-EX"
#define LG4FF_DFEX_NAME "Driving Force / Formula EX"
#define LG4FF_DFP_TAG "DFP"
#define LG4FF_DFP_NAME "Driving Force Pro"
#define LG4FF_G25_TAG "G25"
#define LG4FF_G25_NAME "G25 Racing Wheel"
#define LG4FF_G27_TAG "G27"
#define LG4FF_G27_NAME "G27 Racing Wheel"
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#define LG4FF_G29_TAG "G29"
#define LG4FF_G29_NAME "G29 Racing Wheel"
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#define LG4FF_DFGT_TAG "DFGT"
#define LG4FF_DFGT_NAME "Driving Force GT"

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#define LG4FF_FFEX_REV_MAJ 0x21
#define LG4FF_FFEX_REV_MIN 0x00

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static void lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
static void lg4ff_set_range_g25(struct hid_device *hid, u16 range);
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struct lg4ff_wheel_data {
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	const u32 product_id;
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	u16 combine;
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	u16 range;
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	const u16 min_range;
	const u16 max_range;
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#ifdef CONFIG_LEDS_CLASS
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	u8  led_state;
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	struct led_classdev *led[5];
#endif
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	const u32 alternate_modes;
	const char * const real_tag;
	const char * const real_name;
	const u16 real_product_id;
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	void (*set_range)(struct hid_device *hid, u16 range);
};

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struct lg4ff_device_entry {
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	spinlock_t report_lock; /* Protect output HID report */
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	struct hid_report *report;
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	struct lg4ff_wheel_data wdata;
};

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static const signed short lg4ff_wheel_effects[] = {
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	FF_CONSTANT,
	FF_AUTOCENTER,
	-1
};

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static const signed short no_wheel_effects[] = {
	-1
};

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struct lg4ff_wheel {
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	const u32 product_id;
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	const signed short *ff_effects;
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	const u16 min_range;
	const u16 max_range;
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	void (*set_range)(struct hid_device *hid, u16 range);
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};

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struct lg4ff_compat_mode_switch {
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	const u8 cmd_count;	/* Number of commands to send */
	const u8 cmd[];
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};

struct lg4ff_wheel_ident_info {
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	const u32 modes;
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	const u16 mask;
	const u16 result;
	const u16 real_product_id;
};

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struct lg4ff_multimode_wheel {
	const u16 product_id;
	const u32 alternate_modes;
	const char *real_tag;
	const char *real_name;
};

struct lg4ff_alternate_mode {
	const u16 product_id;
	const char *tag;
	const char *name;
};

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static const struct lg4ff_wheel lg4ff_devices[] = {
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	{USB_DEVICE_ID_LOGITECH_WINGMAN_FG,  no_wheel_effects,    40, 180, NULL},
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	{USB_DEVICE_ID_LOGITECH_WINGMAN_FFG, lg4ff_wheel_effects, 40, 180, NULL},
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	{USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270, NULL},
	{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270, NULL},
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	{USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_dfp},
	{USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
	{USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
	{USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
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	{USB_DEVICE_ID_LOGITECH_G29_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
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	{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
	{USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270, NULL}
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};

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static const struct lg4ff_multimode_wheel lg4ff_multimode_wheels[] = {
	{USB_DEVICE_ID_LOGITECH_DFP_WHEEL,
	 LG4FF_MODE_NATIVE | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
	 LG4FF_DFP_TAG, LG4FF_DFP_NAME},
	{USB_DEVICE_ID_LOGITECH_G25_WHEEL,
	 LG4FF_MODE_NATIVE | LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
	 LG4FF_G25_TAG, LG4FF_G25_NAME},
	{USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,
	 LG4FF_MODE_NATIVE | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
	 LG4FF_DFGT_TAG, LG4FF_DFGT_NAME},
	{USB_DEVICE_ID_LOGITECH_G27_WHEEL,
	 LG4FF_MODE_NATIVE | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
	 LG4FF_G27_TAG, LG4FF_G27_NAME},
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	{USB_DEVICE_ID_LOGITECH_G29_WHEEL,
	 LG4FF_MODE_NATIVE | LG4FF_MODE_G29 | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
	 LG4FF_G29_TAG, LG4FF_G29_NAME},
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};

static const struct lg4ff_alternate_mode lg4ff_alternate_modes[] = {
	[LG4FF_MODE_NATIVE_IDX] = {0, "native", ""},
	[LG4FF_MODE_DFEX_IDX] = {USB_DEVICE_ID_LOGITECH_WHEEL, LG4FF_DFEX_TAG, LG4FF_DFEX_NAME},
	[LG4FF_MODE_DFP_IDX] = {USB_DEVICE_ID_LOGITECH_DFP_WHEEL, LG4FF_DFP_TAG, LG4FF_DFP_NAME},
	[LG4FF_MODE_G25_IDX] = {USB_DEVICE_ID_LOGITECH_G25_WHEEL, LG4FF_G25_TAG, LG4FF_G25_NAME},
	[LG4FF_MODE_DFGT_IDX] = {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL, LG4FF_DFGT_TAG, LG4FF_DFGT_NAME},
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	[LG4FF_MODE_G27_IDX] = {USB_DEVICE_ID_LOGITECH_G27_WHEEL, LG4FF_G27_TAG, LG4FF_G27_NAME},
	[LG4FF_MODE_G29_IDX] = {USB_DEVICE_ID_LOGITECH_G29_WHEEL, LG4FF_G29_TAG, LG4FF_G29_NAME},
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};

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/* Multimode wheel identificators */
static const struct lg4ff_wheel_ident_info lg4ff_dfp_ident_info = {
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	LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
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	0xf000,
	0x1000,
	USB_DEVICE_ID_LOGITECH_DFP_WHEEL
};

static const struct lg4ff_wheel_ident_info lg4ff_g25_ident_info = {
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	LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
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	0xff00,
	0x1200,
	USB_DEVICE_ID_LOGITECH_G25_WHEEL
};

static const struct lg4ff_wheel_ident_info lg4ff_g27_ident_info = {
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	LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
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	0xfff0,
	0x1230,
	USB_DEVICE_ID_LOGITECH_G27_WHEEL
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};

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static const struct lg4ff_wheel_ident_info lg4ff_dfgt_ident_info = {
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	LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
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	0xff00,
	0x1300,
	USB_DEVICE_ID_LOGITECH_DFGT_WHEEL
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};

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static const struct lg4ff_wheel_ident_info lg4ff_g29_ident_info = {
	LG4FF_MODE_G29 | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
	0xfff8,
	0x1350,
	USB_DEVICE_ID_LOGITECH_G29_WHEEL
};

static const struct lg4ff_wheel_ident_info lg4ff_g29_ident_info2 = {
	LG4FF_MODE_G29 | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
	0xff00,
	0x8900,
	USB_DEVICE_ID_LOGITECH_G29_WHEEL
};

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/* Multimode wheel identification checklists */
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static const struct lg4ff_wheel_ident_info *lg4ff_main_checklist[] = {
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	&lg4ff_g29_ident_info,
	&lg4ff_g29_ident_info2,
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	&lg4ff_dfgt_ident_info,
	&lg4ff_g27_ident_info,
	&lg4ff_g25_ident_info,
	&lg4ff_dfp_ident_info
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};

/* Compatibility mode switching commands */
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/* EXT_CMD9 - Understood by G27 and DFGT */
static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfex = {
	2,
	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* Revert mode upon USB reset */
	 0xf8, 0x09, 0x00, 0x01, 0x00, 0x00, 0x00}	/* Switch mode to DF-EX with detach */
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};

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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfp = {
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	2,
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	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* Revert mode upon USB reset */
	 0xf8, 0x09, 0x01, 0x01, 0x00, 0x00, 0x00}	/* Switch mode to DFP with detach */
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};

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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g25 = {
	2,
	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* Revert mode upon USB reset */
	 0xf8, 0x09, 0x02, 0x01, 0x00, 0x00, 0x00}	/* Switch mode to G25 with detach */
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};

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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfgt = {
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	2,
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	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* Revert mode upon USB reset */
	 0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}	/* Switch mode to DFGT with detach */
};

static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g27 = {
	2,
	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* Revert mode upon USB reset */
	 0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}	/* Switch mode to G27 with detach */
};

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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g29 = {
	2,
	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* Revert mode upon USB reset */
	 0xf8, 0x09, 0x05, 0x01, 0x01, 0x00, 0x00}	/* Switch mode to G29 with detach */
};

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/* EXT_CMD1 - Understood by DFP, G25, G27 and DFGT */
static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext01_dfp = {
	1,
	{0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
};

/* EXT_CMD16 - Understood by G25 and G27 */
static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext16_g25 = {
	1,
	{0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
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};

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/* Recalculates X axis value accordingly to currently selected range */
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static s32 lg4ff_adjust_dfp_x_axis(s32 value, u16 range)
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{
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	u16 max_range;
	s32 new_value;
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	if (range == 900)
		return value;
	else if (range == 200)
		return value;
	else if (range < 200)
		max_range = 200;
	else
		max_range = 900;

	new_value = 8192 + mult_frac(value - 8192, max_range, range);
	if (new_value < 0)
		return 0;
	else if (new_value > 16383)
		return 16383;
	else
		return new_value;
}

int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field,
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			     struct hid_usage *usage, s32 value, struct lg_drv_data *drv_data)
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{
	struct lg4ff_device_entry *entry = drv_data->device_props;
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	s32 new_value = 0;
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	if (!entry) {
		hid_err(hid, "Device properties not found");
		return 0;
	}

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	switch (entry->wdata.product_id) {
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	case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
		switch (usage->code) {
		case ABS_X:
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			new_value = lg4ff_adjust_dfp_x_axis(value, entry->wdata.range);
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			input_event(field->hidinput->input, usage->type, usage->code, new_value);
			return 1;
		default:
			return 0;
		}
	default:
		return 0;
	}
}

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int lg4ff_raw_event(struct hid_device *hdev, struct hid_report *report,
		u8 *rd, int size, struct lg_drv_data *drv_data)
{
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	int offset;
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	struct lg4ff_device_entry *entry = drv_data->device_props;

	if (!entry)
		return 0;

	/* adjust HID report present combined pedals data */
	if (entry->wdata.combine) {
		switch (entry->wdata.product_id) {
		case USB_DEVICE_ID_LOGITECH_WHEEL:
			rd[5] = rd[3];
			rd[6] = 0x7F;
			return 1;
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		case USB_DEVICE_ID_LOGITECH_WINGMAN_FG:
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		case USB_DEVICE_ID_LOGITECH_WINGMAN_FFG:
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		case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL:
		case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2:
			rd[4] = rd[3];
			rd[5] = 0x7F;
			return 1;
		case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
			rd[5] = rd[4];
			rd[6] = 0x7F;
			return 1;
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		case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
		case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
			offset = 5;
			break;
		case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
		case USB_DEVICE_ID_LOGITECH_G29_WHEEL:
			offset = 6;
			break;
		case USB_DEVICE_ID_LOGITECH_WII_WHEEL:
			offset = 3;
			break;
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		default:
			return 0;
		}
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		/* Compute a combined axis when wheel does not supply it */
		rd[offset] = (0xFF + rd[offset] - rd[offset+1]) >> 1;
		rd[offset+1] = 0x7F;
		return 1;
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	}

	return 0;
}

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static void lg4ff_init_wheel_data(struct lg4ff_wheel_data * const wdata, const struct lg4ff_wheel *wheel,
				  const struct lg4ff_multimode_wheel *mmode_wheel,
				  const u16 real_product_id)
{
	u32 alternate_modes = 0;
	const char *real_tag = NULL;
	const char *real_name = NULL;

	if (mmode_wheel) {
		alternate_modes = mmode_wheel->alternate_modes;
		real_tag = mmode_wheel->real_tag;
		real_name = mmode_wheel->real_name;
	}

	{
		struct lg4ff_wheel_data t_wdata =  { .product_id = wheel->product_id,
						     .real_product_id = real_product_id,
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						     .combine = 0,
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						     .min_range = wheel->min_range,
						     .max_range = wheel->max_range,
						     .set_range = wheel->set_range,
						     .alternate_modes = alternate_modes,
						     .real_tag = real_tag,
						     .real_name = real_name };

		memcpy(wdata, &t_wdata, sizeof(t_wdata));
	}
}

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static int lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
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{
	struct hid_device *hid = input_get_drvdata(dev);
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	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	unsigned long flags;
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	s32 *value;
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	int x;

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	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return -EINVAL;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return -EINVAL;
	}
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	value = entry->report->field[0]->value;
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#define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)
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	switch (effect->type) {
	case FF_CONSTANT:
		x = effect->u.ramp.start_level + 0x80;	/* 0x80 is no force */
		CLAMP(x);
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		spin_lock_irqsave(&entry->report_lock, flags);
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		if (x == 0x80) {
			/* De-activate force in slot-1*/
			value[0] = 0x13;
			value[1] = 0x00;
			value[2] = 0x00;
			value[3] = 0x00;
			value[4] = 0x00;
			value[5] = 0x00;
			value[6] = 0x00;

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			hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
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			spin_unlock_irqrestore(&entry->report_lock, flags);
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			return 0;
		}

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		value[0] = 0x11;	/* Slot 1 */
		value[1] = 0x08;
		value[2] = x;
		value[3] = 0x80;
		value[4] = 0x00;
		value[5] = 0x00;
		value[6] = 0x00;
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		hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
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		spin_unlock_irqrestore(&entry->report_lock, flags);
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		break;
	}
	return 0;
}

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/* Sends default autocentering command compatible with
 * all wheels except Formula Force EX */
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static void lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
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{
	struct hid_device *hid = input_get_drvdata(dev);
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	s32 *value;
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	u32 expand_a, expand_b;
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	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
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	unsigned long flags;
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	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return;
	}
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	value = entry->report->field[0]->value;
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	/* De-activate Auto-Center */
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	spin_lock_irqsave(&entry->report_lock, flags);
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	if (magnitude == 0) {
		value[0] = 0xf5;
		value[1] = 0x00;
		value[2] = 0x00;
		value[3] = 0x00;
		value[4] = 0x00;
		value[5] = 0x00;
		value[6] = 0x00;

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		hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
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		spin_unlock_irqrestore(&entry->report_lock, flags);
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		return;
	}

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	if (magnitude <= 0xaaaa) {
		expand_a = 0x0c * magnitude;
		expand_b = 0x80 * magnitude;
	} else {
		expand_a = (0x0c * 0xaaaa) + 0x06 * (magnitude - 0xaaaa);
		expand_b = (0x80 * 0xaaaa) + 0xff * (magnitude - 0xaaaa);
	}
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	/* Adjust for non-MOMO wheels */
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	switch (entry->wdata.product_id) {
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	case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL:
	case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2:
		break;
	default:
		expand_a = expand_a >> 1;
		break;
	}

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	value[0] = 0xfe;
	value[1] = 0x0d;
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	value[2] = expand_a / 0xaaaa;
	value[3] = expand_a / 0xaaaa;
	value[4] = expand_b / 0xaaaa;
529 530
	value[5] = 0x00;
	value[6] = 0x00;
531

532
	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
533 534 535 536 537 538 539 540 541 542

	/* Activate Auto-Center */
	value[0] = 0x14;
	value[1] = 0x00;
	value[2] = 0x00;
	value[3] = 0x00;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;

543
	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
544
	spin_unlock_irqrestore(&entry->report_lock, flags);
545 546
}

547
/* Sends autocentering command compatible with Formula Force EX */
548
static void lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
549 550
{
	struct hid_device *hid = input_get_drvdata(dev);
551 552 553
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	unsigned long flags;
554
	s32 *value;
555 556
	magnitude = magnitude * 90 / 65535;

557 558 559 560 561 562 563 564 565 566 567
	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return;
	}
568
	value = entry->report->field[0]->value;
569 570

	spin_lock_irqsave(&entry->report_lock, flags);
571 572 573 574 575 576 577
	value[0] = 0xfe;
	value[1] = 0x03;
	value[2] = magnitude >> 14;
	value[3] = magnitude >> 14;
	value[4] = magnitude;
	value[5] = 0x00;
	value[6] = 0x00;
578

579
	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
580
	spin_unlock_irqrestore(&entry->report_lock, flags);
581 582
}

583
/* Sends command to set range compatible with G25/G27/Driving Force GT */
584
static void lg4ff_set_range_g25(struct hid_device *hid, u16 range)
585
{
586 587 588
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	unsigned long flags;
589
	s32 *value;
590

591 592 593 594 595 596 597 598 599 600 601
	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return;
	}
602
	value = entry->report->field[0]->value;
603 604
	dbg_hid("G25/G27/DFGT: setting range to %u\n", range);

605
	spin_lock_irqsave(&entry->report_lock, flags);
606 607 608 609 610 611 612
	value[0] = 0xf8;
	value[1] = 0x81;
	value[2] = range & 0x00ff;
	value[3] = (range & 0xff00) >> 8;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;
613

614
	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
615
	spin_unlock_irqrestore(&entry->report_lock, flags);
616 617 618
}

/* Sends commands to set range compatible with Driving Force Pro wheel */
619
static void lg4ff_set_range_dfp(struct hid_device *hid, u16 range)
620
{
621 622 623
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	unsigned long flags;
624 625
	int start_left, start_right, full_range;
	s32 *value;
626

627 628 629 630 631 632 633 634 635 636 637
	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return;
	}
638
	value = entry->report->field[0]->value;
639 640 641
	dbg_hid("Driving Force Pro: setting range to %u\n", range);

	/* Prepare "coarse" limit command */
642
	spin_lock_irqsave(&entry->report_lock, flags);
643
	value[0] = 0xf8;
644
	value[1] = 0x00;	/* Set later */
645 646 647 648 649
	value[2] = 0x00;
	value[3] = 0x00;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;
650 651

	if (range > 200) {
652
		value[1] = 0x03;
653 654
		full_range = 900;
	} else {
655
		value[1] = 0x02;
656 657
		full_range = 200;
	}
658
	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
659 660

	/* Prepare "fine" limit command */
661 662 663 664 665 666 667
	value[0] = 0x81;
	value[1] = 0x0b;
	value[2] = 0x00;
	value[3] = 0x00;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;
668 669

	if (range == 200 || range == 900) {	/* Do not apply any fine limit */
670
		hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
671
		spin_unlock_irqrestore(&entry->report_lock, flags);
672 673 674 675 676 677 678
		return;
	}

	/* Construct fine limit command */
	start_left = (((full_range - range + 1) * 2047) / full_range);
	start_right = 0xfff - start_left;

679 680 681 682 683
	value[2] = start_left >> 4;
	value[3] = start_right >> 4;
	value[4] = 0xff;
	value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
	value[6] = 0xff;
684

685
	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
686
	spin_unlock_irqrestore(&entry->report_lock, flags);
687 688
}

689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726
static const struct lg4ff_compat_mode_switch *lg4ff_get_mode_switch_command(const u16 real_product_id, const u16 target_product_id)
{
	switch (real_product_id) {
	case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
		switch (target_product_id) {
		case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
			return &lg4ff_mode_switch_ext01_dfp;
		/* DFP can only be switched to its native mode */
		default:
			return NULL;
		}
		break;
	case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
		switch (target_product_id) {
		case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
			return &lg4ff_mode_switch_ext01_dfp;
		case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
			return &lg4ff_mode_switch_ext16_g25;
		/* G25 can only be switched to DFP mode or its native mode */
		default:
			return NULL;
		}
		break;
	case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
		switch (target_product_id) {
		case USB_DEVICE_ID_LOGITECH_WHEEL:
			return &lg4ff_mode_switch_ext09_dfex;
		case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
			return &lg4ff_mode_switch_ext09_dfp;
		case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
			return &lg4ff_mode_switch_ext09_g25;
		case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
			return &lg4ff_mode_switch_ext09_g27;
		/* G27 can only be switched to DF-EX, DFP, G25 or its native mode */
		default:
			return NULL;
		}
		break;
727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743
	case USB_DEVICE_ID_LOGITECH_G29_WHEEL:
		switch (target_product_id) {
		case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
			return &lg4ff_mode_switch_ext09_dfp;
		case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
			return &lg4ff_mode_switch_ext09_dfgt;
		case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
			return &lg4ff_mode_switch_ext09_g25;
		case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
			return &lg4ff_mode_switch_ext09_g27;
		case USB_DEVICE_ID_LOGITECH_G29_WHEEL:
			return &lg4ff_mode_switch_ext09_g29;
		/* G29 can only be switched to DF-EX, DFP, DFGT, G25, G27 or its native mode */
		default:
			return NULL;
		}
		break;
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762
	case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
		switch (target_product_id) {
		case USB_DEVICE_ID_LOGITECH_WHEEL:
			return &lg4ff_mode_switch_ext09_dfex;
		case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
			return &lg4ff_mode_switch_ext09_dfp;
		case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
			return &lg4ff_mode_switch_ext09_dfgt;
		/* DFGT can only be switched to DF-EX, DFP or its native mode */
		default:
			return NULL;
		}
		break;
	/* No other wheels have multiple modes */
	default:
		return NULL;
	}
}

763
static int lg4ff_switch_compatibility_mode(struct hid_device *hid, const struct lg4ff_compat_mode_switch *s)
764
{
765 766 767
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	unsigned long flags;
768
	s32 *value;
769
	u8 i;
770

771 772 773 774 775 776 777 778 779 780 781
	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return -EINVAL;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return -EINVAL;
	}
782
	value = entry->report->field[0]->value;
783 784

	spin_lock_irqsave(&entry->report_lock, flags);
785
	for (i = 0; i < s->cmd_count; i++) {
786
		u8 j;
787

788 789 790
		for (j = 0; j < 7; j++)
			value[j] = s->cmd[j + (7*i)];

791
		hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
792
	}
793
	spin_unlock_irqrestore(&entry->report_lock, flags);
794
	hid_hw_wait(hid);
795
	return 0;
796
}
797

798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817
static ssize_t lg4ff_alternate_modes_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct hid_device *hid = to_hid_device(dev);
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	ssize_t count = 0;
	int i;

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return 0;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return 0;
	}

818
	if (!entry->wdata.real_name) {
819 820 821 822 823
		hid_err(hid, "NULL pointer to string\n");
		return 0;
	}

	for (i = 0; i < LG4FF_MODE_MAX_IDX; i++) {
824
		if (entry->wdata.alternate_modes & BIT(i)) {
825 826 827
			/* Print tag and full name */
			count += scnprintf(buf + count, PAGE_SIZE - count, "%s: %s",
					   lg4ff_alternate_modes[i].tag,
828
					   !lg4ff_alternate_modes[i].product_id ? entry->wdata.real_name : lg4ff_alternate_modes[i].name);
829 830 831 832
			if (count >= PAGE_SIZE - 1)
				return count;

			/* Mark the currently active mode with an asterisk */
833 834
			if (lg4ff_alternate_modes[i].product_id == entry->wdata.product_id ||
			    (lg4ff_alternate_modes[i].product_id == 0 && entry->wdata.product_id == entry->wdata.real_product_id))
835 836 837 838 839 840 841 842 843 844 845 846 847 848
				count += scnprintf(buf + count, PAGE_SIZE - count, " *\n");
			else
				count += scnprintf(buf + count, PAGE_SIZE - count, "\n");

			if (count >= PAGE_SIZE - 1)
				return count;
		}
	}

	return count;
}

static ssize_t lg4ff_alternate_modes_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886
	struct hid_device *hid = to_hid_device(dev);
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	const struct lg4ff_compat_mode_switch *s;
	u16 target_product_id = 0;
	int i, ret;
	char *lbuf;

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return -EINVAL;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return -EINVAL;
	}

	/* Allow \n at the end of the input parameter */
	lbuf = kasprintf(GFP_KERNEL, "%s", buf);
	if (!lbuf)
		return -ENOMEM;

	i = strlen(lbuf);
	if (lbuf[i-1] == '\n') {
		if (i == 1) {
			kfree(lbuf);
			return -EINVAL;
		}
		lbuf[i-1] = '\0';
	}

	for (i = 0; i < LG4FF_MODE_MAX_IDX; i++) {
		const u16 mode_product_id = lg4ff_alternate_modes[i].product_id;
		const char *tag = lg4ff_alternate_modes[i].tag;

887
		if (entry->wdata.alternate_modes & BIT(i)) {
888 889
			if (!strcmp(tag, lbuf)) {
				if (!mode_product_id)
890
					target_product_id = entry->wdata.real_product_id;
891 892 893 894 895 896 897 898 899 900 901 902 903 904
				else
					target_product_id = mode_product_id;
				break;
			}
		}
	}

	if (i == LG4FF_MODE_MAX_IDX) {
		hid_info(hid, "Requested mode \"%s\" is not supported by the device\n", lbuf);
		kfree(lbuf);
		return -EINVAL;
	}
	kfree(lbuf); /* Not needed anymore */

905
	if (target_product_id == entry->wdata.product_id) /* Nothing to do */
906 907 908 909 910
		return count;

	/* Automatic switching has to be disabled for the switch to DF-EX mode to work correctly */
	if (target_product_id == USB_DEVICE_ID_LOGITECH_WHEEL && !lg4ff_no_autoswitch) {
		hid_info(hid, "\"%s\" cannot be switched to \"DF-EX\" mode. Load the \"hid_logitech\" module with \"lg4ff_no_autoswitch=1\" parameter set and try again\n",
911
			 entry->wdata.real_name);
912 913 914 915
		return -EINVAL;
	}

	/* Take care of hardware limitations */
916 917 918
	if ((entry->wdata.real_product_id == USB_DEVICE_ID_LOGITECH_DFP_WHEEL || entry->wdata.real_product_id == USB_DEVICE_ID_LOGITECH_G25_WHEEL) &&
	    entry->wdata.product_id > target_product_id) {
		hid_info(hid, "\"%s\" cannot be switched back into \"%s\" mode\n", entry->wdata.real_name, lg4ff_alternate_modes[i].name);
919 920 921
		return -EINVAL;
	}

922
	s = lg4ff_get_mode_switch_command(entry->wdata.real_product_id, target_product_id);
923 924 925 926 927 928 929
	if (!s) {
		hid_err(hid, "Invalid target product ID %X\n", target_product_id);
		return -EINVAL;
	}

	ret = lg4ff_switch_compatibility_mode(hid, s);
	return (ret == 0 ? count : ret);
930 931 932
}
static DEVICE_ATTR(alternate_modes, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_alternate_modes_show, lg4ff_alternate_modes_store);

933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
static ssize_t lg4ff_combine_show(struct device *dev, struct device_attribute *attr,
				char *buf)
{
	struct hid_device *hid = to_hid_device(dev);
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	size_t count;

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return 0;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return 0;
	}

	count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->wdata.combine);
	return count;
}

static ssize_t lg4ff_combine_store(struct device *dev, struct device_attribute *attr,
				 const char *buf, size_t count)
{
	struct hid_device *hid = to_hid_device(dev);
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	u16 combine = simple_strtoul(buf, NULL, 10);

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return -EINVAL;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return -EINVAL;
	}

	if (combine > 1)
		combine = 1;

	entry->wdata.combine = combine;
	return count;
}
static DEVICE_ATTR(combine_pedals, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_combine_show, lg4ff_combine_store);

985 986 987
/* Export the currently set range of the wheel */
static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr,
				char *buf)
988 989
{
	struct hid_device *hid = to_hid_device(dev);
990 991
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
992 993
	size_t count;

994 995 996 997
	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return 0;
998
	}
999 1000 1001 1002

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
1003 1004 1005
		return 0;
	}

1006
	count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->wdata.range);
1007 1008 1009 1010 1011
	return count;
}

/* Set range to user specified value, call appropriate function
 * according to the type of the wheel */
1012 1013
static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr,
				 const char *buf, size_t count)
1014 1015
{
	struct hid_device *hid = to_hid_device(dev);
1016 1017
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
1018
	u16 range = simple_strtoul(buf, NULL, 10);
1019

1020 1021 1022
	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
1023
		return -EINVAL;
1024
	}
1025 1026 1027 1028

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
1029
		return -EINVAL;
1030 1031 1032
	}

	if (range == 0)
1033
		range = entry->wdata.max_range;
1034 1035 1036

	/* Check if the wheel supports range setting
	 * and that the range is within limits for the wheel */
1037 1038 1039
	if (entry->wdata.set_range && range >= entry->wdata.min_range && range <= entry->wdata.max_range) {
		entry->wdata.set_range(hid, range);
		entry->wdata.range = range;
1040 1041 1042 1043
	}

	return count;
}
1044
static DEVICE_ATTR(range, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_range_show, lg4ff_range_store);
1045

1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
static ssize_t lg4ff_real_id_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct hid_device *hid = to_hid_device(dev);
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	size_t count;

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return 0;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return 0;
	}

1065
	if (!entry->wdata.real_tag || !entry->wdata.real_name) {
1066 1067 1068 1069
		hid_err(hid, "NULL pointer to string\n");
		return 0;
	}

1070
	count = scnprintf(buf, PAGE_SIZE, "%s: %s\n", entry->wdata.real_tag, entry->wdata.real_name);
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
	return count;
}

static ssize_t lg4ff_real_id_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	/* Real ID is a read-only value */
	return -EPERM;
}
static DEVICE_ATTR(real_id, S_IRUGO, lg4ff_real_id_show, lg4ff_real_id_store);

1081
#ifdef CONFIG_LEDS_CLASS
1082
static void lg4ff_set_leds(struct hid_device *hid, u8 leds)
1083
{
1084 1085 1086
	struct lg_drv_data *drv_data;
	struct lg4ff_device_entry *entry;
	unsigned long flags;
1087
	s32 *value;
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	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return;
	}
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	value = entry->report->field[0]->value;
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	spin_lock_irqsave(&entry->report_lock, flags);
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	value[0] = 0xf8;
	value[1] = 0x12;
	value[2] = leds;
	value[3] = 0x00;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;
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	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
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	spin_unlock_irqrestore(&entry->report_lock, flags);
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}

static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
			enum led_brightness value)
{
	struct device *dev = led_cdev->dev->parent;
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	struct hid_device *hid = to_hid_device(dev);
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	struct lg_drv_data *drv_data = hid_get_drvdata(hid);
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	struct lg4ff_device_entry *entry;
	int i, state = 0;

	if (!drv_data) {
		hid_err(hid, "Device data not found.");
		return;
	}

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	entry = drv_data->device_props;
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	if (!entry) {
		hid_err(hid, "Device properties not found.");
		return;
	}

	for (i = 0; i < 5; i++) {
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		if (led_cdev != entry->wdata.led[i])
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			continue;
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		state = (entry->wdata.led_state >> i) & 1;
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		if (value == LED_OFF && state) {
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			entry->wdata.led_state &= ~(1 << i);
			lg4ff_set_leds(hid, entry->wdata.led_state);
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		} else if (value != LED_OFF && !state) {
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			entry->wdata.led_state |= 1 << i;
			lg4ff_set_leds(hid, entry->wdata.led_state);
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		}
		break;
	}
}

static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
{
	struct device *dev = led_cdev->dev->parent;
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	struct hid_device *hid = to_hid_device(dev);
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	struct lg_drv_data *drv_data = hid_get_drvdata(hid);
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	struct lg4ff_device_entry *entry;
	int i, value = 0;

	if (!drv_data) {
		hid_err(hid, "Device data not found.");
		return LED_OFF;
	}

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	entry = drv_data->device_props;
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	if (!entry) {
		hid_err(hid, "Device properties not found.");
		return LED_OFF;
	}

	for (i = 0; i < 5; i++)
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		if (led_cdev == entry->wdata.led[i]) {
			value = (entry->wdata.led_state >> i) & 1;
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			break;
		}

	return value ? LED_FULL : LED_OFF;
}
#endif

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static u16 lg4ff_identify_multimode_wheel(struct hid_device *hid, const u16 reported_product_id, const u16 bcdDevice)
{
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	u32 current_mode;
	int i;
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	/* identify current mode from USB PID */
	for (i = 1; i < ARRAY_SIZE(lg4ff_alternate_modes); i++) {
		dbg_hid("Testing whether PID is %X\n", lg4ff_alternate_modes[i].product_id);
		if (reported_product_id == lg4ff_alternate_modes[i].product_id)
			break;
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	}

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	if (i == ARRAY_SIZE(lg4ff_alternate_modes))
		return 0;

	current_mode = BIT(i);

	for (i = 0; i < ARRAY_SIZE(lg4ff_main_checklist); i++) {
		const u16 mask = lg4ff_main_checklist[i]->mask;
		const u16 result = lg4ff_main_checklist[i]->result;
		const u16 real_product_id = lg4ff_main_checklist[i]->real_product_id;
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		if ((current_mode & lg4ff_main_checklist[i]->modes) && \
				(bcdDevice & mask) == result) {
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			dbg_hid("Found wheel with real PID %X whose reported PID is %X\n", real_product_id, reported_product_id);
			return real_product_id;
		}
	}

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	/* No match found. This is either Driving Force or an unknown
	 * wheel model, do not touch it */
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	dbg_hid("Wheel with bcdDevice %X was not recognized as multimode wheel, leaving in its current mode\n", bcdDevice);
	return 0;
}

static int lg4ff_handle_multimode_wheel(struct hid_device *hid, u16 *real_product_id, const u16 bcdDevice)
{
	const u16 reported_product_id = hid->product;
	int ret;

	*real_product_id = lg4ff_identify_multimode_wheel(hid, reported_product_id, bcdDevice);
	/* Probed wheel is not a multimode wheel */
	if (!*real_product_id) {
		*real_product_id = reported_product_id;
		dbg_hid("Wheel is not a multimode wheel\n");
		return LG4FF_MMODE_NOT_MULTIMODE;
	}

	/* Switch from "Driving Force" mode to native mode automatically.
	 * Otherwise keep the wheel in its current mode */
	if (reported_product_id == USB_DEVICE_ID_LOGITECH_WHEEL &&
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	    reported_product_id != *real_product_id &&
	    !lg4ff_no_autoswitch) {
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		const struct lg4ff_compat_mode_switch *s = lg4ff_get_mode_switch_command(*real_product_id, *real_product_id);
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		if (!s) {
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			hid_err(hid, "Invalid product id %X\n", *real_product_id);
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			return LG4FF_MMODE_NOT_MULTIMODE;
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		}

		ret = lg4ff_switch_compatibility_mode(hid, s);
		if (ret) {
			/* Wheel could not have been switched to native mode,
			 * leave it in "Driving Force" mode and continue */
			hid_err(hid, "Unable to switch wheel mode, errno %d\n", ret);
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			return LG4FF_MMODE_IS_MULTIMODE;
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		}
		return LG4FF_MMODE_SWITCHED;
	}

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	return LG4FF_MMODE_IS_MULTIMODE;
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}


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int lg4ff_init(struct hid_device *hid)
{
	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
	struct input_dev *dev = hidinput->input;
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	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
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	const struct usb_device_descriptor *udesc = &(hid_to_usb_dev(hid)->descriptor);
	const u16 bcdDevice = le16_to_cpu(udesc->bcdDevice);
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	const struct lg4ff_multimode_wheel *mmode_wheel = NULL;
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	struct lg4ff_device_entry *entry;
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	struct lg_drv_data *drv_data;
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	int error, i, j;
	int mmode_ret, mmode_idx = -1;
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	u16 real_product_id;
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	/* Check that the report looks ok */
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	if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
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		return -1;
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	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Cannot add device, private driver data not allocated\n");
		return -1;
	}
	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
	if (!entry)
		return -ENOMEM;
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	spin_lock_init(&entry->report_lock);
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	entry->report = report;
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	drv_data->device_props = entry;

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	/* Check if a multimode wheel has been connected and
	 * handle it appropriately */
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	mmode_ret = lg4ff_handle_multimode_wheel(hid, &real_product_id, bcdDevice);
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	/* Wheel has been told to switch to native mode. There is no point in going on
	 * with the initialization as the wheel will do a USB reset when it switches mode
	 */
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	if (mmode_ret == LG4FF_MMODE_SWITCHED)
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		return 0;
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	else if (mmode_ret < 0) {
		hid_err(hid, "Unable to switch device mode during initialization, errno %d\n", mmode_ret);
		error = mmode_ret;
		goto err_init;
	}