// SPDX-License-Identifier: GPL-2.0+
/*
 * HID driver for Nintendo Switch Joy-Cons and Pro Controllers
 *
 * Copyright (c) 2019-2021 Daniel J. Ogorchock <djogorchock@gmail.com>
 *
 * The following resources/projects were referenced for this driver:
 *   https://github.com/dekuNukem/Nintendo_Switch_Reverse_Engineering
 *   https://gitlab.com/pjranki/joycon-linux-kernel (Peter Rankin)
 *   https://github.com/FrotBot/SwitchProConLinuxUSB
 *   https://github.com/MTCKC/ProconXInput
 *   https://github.com/Davidobot/BetterJoyForCemu
 *   hid-wiimote kernel hid driver
 *   hid-logitech-hidpp driver
 *   hid-sony driver
 *
 * This driver supports the Nintendo Switch Joy-Cons and Pro Controllers. The
 * Pro Controllers can either be used over USB or Bluetooth.
 *
 * The driver will retrieve the factory calibration info from the controllers,
 * so little to no user calibration should be required.
 *
 */

#include "hid-ids.h"
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/power_supply.h>
#include <linux/spinlock.h>

/*
 * Reference the url below for the following HID report defines:
 * https://github.com/dekuNukem/Nintendo_Switch_Reverse_Engineering
 */

/* Output Reports */
#define JC_OUTPUT_RUMBLE_AND_SUBCMD	 0x01
#define JC_OUTPUT_FW_UPDATE_PKT		 0x03
#define JC_OUTPUT_RUMBLE_ONLY		 0x10
#define JC_OUTPUT_MCU_DATA		 0x11
#define JC_OUTPUT_USB_CMD		 0x80

/* Subcommand IDs */
#define JC_SUBCMD_STATE			 0x00
#define JC_SUBCMD_MANUAL_BT_PAIRING	 0x01
#define JC_SUBCMD_REQ_DEV_INFO		 0x02
#define JC_SUBCMD_SET_REPORT_MODE	 0x03
#define JC_SUBCMD_TRIGGERS_ELAPSED	 0x04
#define JC_SUBCMD_GET_PAGE_LIST_STATE	 0x05
#define JC_SUBCMD_SET_HCI_STATE		 0x06
#define JC_SUBCMD_RESET_PAIRING_INFO	 0x07
#define JC_SUBCMD_LOW_POWER_MODE	 0x08
#define JC_SUBCMD_SPI_FLASH_READ	 0x10
#define JC_SUBCMD_SPI_FLASH_WRITE	 0x11
#define JC_SUBCMD_RESET_MCU		 0x20
#define JC_SUBCMD_SET_MCU_CONFIG	 0x21
#define JC_SUBCMD_SET_MCU_STATE		 0x22
#define JC_SUBCMD_SET_PLAYER_LIGHTS	 0x30
#define JC_SUBCMD_GET_PLAYER_LIGHTS	 0x31
#define JC_SUBCMD_SET_HOME_LIGHT	 0x38
#define JC_SUBCMD_ENABLE_IMU		 0x40
#define JC_SUBCMD_SET_IMU_SENSITIVITY	 0x41
#define JC_SUBCMD_WRITE_IMU_REG		 0x42
#define JC_SUBCMD_READ_IMU_REG		 0x43
#define JC_SUBCMD_ENABLE_VIBRATION	 0x48
#define JC_SUBCMD_GET_REGULATED_VOLTAGE	 0x50

/* Input Reports */
#define JC_INPUT_BUTTON_EVENT		 0x3F
#define JC_INPUT_SUBCMD_REPLY		 0x21
#define JC_INPUT_IMU_DATA		 0x30
#define JC_INPUT_MCU_DATA		 0x31
#define JC_INPUT_USB_RESPONSE		 0x81

/* Feature Reports */
#define JC_FEATURE_LAST_SUBCMD		 0x02
#define JC_FEATURE_OTA_FW_UPGRADE	 0x70
#define JC_FEATURE_SETUP_MEM_READ	 0x71
#define JC_FEATURE_MEM_READ		 0x72
#define JC_FEATURE_ERASE_MEM_SECTOR	 0x73
#define JC_FEATURE_MEM_WRITE		 0x74
#define JC_FEATURE_LAUNCH		 0x75

/* USB Commands */
#define JC_USB_CMD_CONN_STATUS		 0x01
#define JC_USB_CMD_HANDSHAKE		 0x02
#define JC_USB_CMD_BAUDRATE_3M		 0x03
#define JC_USB_CMD_NO_TIMEOUT		 0x04
#define JC_USB_CMD_EN_TIMEOUT		 0x05
#define JC_USB_RESET			 0x06
#define JC_USB_PRE_HANDSHAKE		 0x91
#define JC_USB_SEND_UART		 0x92

/* SPI storage addresses of factory calibration data */
#define JC_CAL_DATA_START	0x603d
#define JC_CAL_DATA_END		0x604e
#define JC_CAL_DATA_SIZE	(JC_CAL_DATA_END - JC_CAL_DATA_START + 1)

/* The raw analog joystick values will be mapped in terms of this magnitude */
#define JC_MAX_STICK_MAG		 32767
#define JC_STICK_FUZZ			 250
#define JC_STICK_FLAT			 500

/* Hat values for pro controller's d-pad */
#define JC_MAX_DPAD_MAG		1
#define JC_DPAD_FUZZ		0
#define JC_DPAD_FLAT		0

/* frequency/amplitude tables for rumble */
struct joycon_rumble_freq_data {
	u16 high;
	u8 low;
	u16 freq; /* Hz*/
};

struct joycon_rumble_amp_data {
	u8 high;
	u16 low;
	u16 amp;
};

#if IS_ENABLED(CONFIG_NINTENDO_FF)
/*
 * These tables are from
 * https://github.com/dekuNukem/Nintendo_Switch_Reverse_Engineering/blob/master/rumble_data_table.md
 */
static const struct joycon_rumble_freq_data joycon_rumble_frequencies[] = {
	/* high, low, freq */
	{ 0x0000, 0x01,   41 }, { 0x0000, 0x02,   42 }, { 0x0000, 0x03,   43 },
	{ 0x0000, 0x04,   44 }, { 0x0000, 0x05,   45 }, { 0x0000, 0x06,   46 },
	{ 0x0000, 0x07,   47 }, { 0x0000, 0x08,   48 }, { 0x0000, 0x09,   49 },
	{ 0x0000, 0x0A,   50 }, { 0x0000, 0x0B,   51 }, { 0x0000, 0x0C,   52 },
	{ 0x0000, 0x0D,   53 }, { 0x0000, 0x0E,   54 }, { 0x0000, 0x0F,   55 },
	{ 0x0000, 0x10,   57 }, { 0x0000, 0x11,   58 }, { 0x0000, 0x12,   59 },
	{ 0x0000, 0x13,   60 }, { 0x0000, 0x14,   62 }, { 0x0000, 0x15,   63 },
	{ 0x0000, 0x16,   64 }, { 0x0000, 0x17,   66 }, { 0x0000, 0x18,   67 },
	{ 0x0000, 0x19,   69 }, { 0x0000, 0x1A,   70 }, { 0x0000, 0x1B,   72 },
	{ 0x0000, 0x1C,   73 }, { 0x0000, 0x1D,   75 }, { 0x0000, 0x1e,   77 },
	{ 0x0000, 0x1f,   78 }, { 0x0000, 0x20,   80 }, { 0x0400, 0x21,   82 },
	{ 0x0800, 0x22,   84 }, { 0x0c00, 0x23,   85 }, { 0x1000, 0x24,   87 },
	{ 0x1400, 0x25,   89 }, { 0x1800, 0x26,   91 }, { 0x1c00, 0x27,   93 },
	{ 0x2000, 0x28,   95 }, { 0x2400, 0x29,   97 }, { 0x2800, 0x2a,   99 },
	{ 0x2c00, 0x2b,  102 }, { 0x3000, 0x2c,  104 }, { 0x3400, 0x2d,  106 },
	{ 0x3800, 0x2e,  108 }, { 0x3c00, 0x2f,  111 }, { 0x4000, 0x30,  113 },
	{ 0x4400, 0x31,  116 }, { 0x4800, 0x32,  118 }, { 0x4c00, 0x33,  121 },
	{ 0x5000, 0x34,  123 }, { 0x5400, 0x35,  126 }, { 0x5800, 0x36,  129 },
	{ 0x5c00, 0x37,  132 }, { 0x6000, 0x38,  135 }, { 0x6400, 0x39,  137 },
	{ 0x6800, 0x3a,  141 }, { 0x6c00, 0x3b,  144 }, { 0x7000, 0x3c,  147 },
	{ 0x7400, 0x3d,  150 }, { 0x7800, 0x3e,  153 }, { 0x7c00, 0x3f,  157 },
	{ 0x8000, 0x40,  160 }, { 0x8400, 0x41,  164 }, { 0x8800, 0x42,  167 },
	{ 0x8c00, 0x43,  171 }, { 0x9000, 0x44,  174 }, { 0x9400, 0x45,  178 },
	{ 0x9800, 0x46,  182 }, { 0x9c00, 0x47,  186 }, { 0xa000, 0x48,  190 },
	{ 0xa400, 0x49,  194 }, { 0xa800, 0x4a,  199 }, { 0xac00, 0x4b,  203 },
	{ 0xb000, 0x4c,  207 }, { 0xb400, 0x4d,  212 }, { 0xb800, 0x4e,  217 },
	{ 0xbc00, 0x4f,  221 }, { 0xc000, 0x50,  226 }, { 0xc400, 0x51,  231 },
	{ 0xc800, 0x52,  236 }, { 0xcc00, 0x53,  241 }, { 0xd000, 0x54,  247 },
	{ 0xd400, 0x55,  252 }, { 0xd800, 0x56,  258 }, { 0xdc00, 0x57,  263 },
	{ 0xe000, 0x58,  269 }, { 0xe400, 0x59,  275 }, { 0xe800, 0x5a,  281 },
	{ 0xec00, 0x5b,  287 }, { 0xf000, 0x5c,  293 }, { 0xf400, 0x5d,  300 },
	{ 0xf800, 0x5e,  306 }, { 0xfc00, 0x5f,  313 }, { 0x0001, 0x60,  320 },
	{ 0x0401, 0x61,  327 }, { 0x0801, 0x62,  334 }, { 0x0c01, 0x63,  341 },
	{ 0x1001, 0x64,  349 }, { 0x1401, 0x65,  357 }, { 0x1801, 0x66,  364 },
	{ 0x1c01, 0x67,  372 }, { 0x2001, 0x68,  381 }, { 0x2401, 0x69,  389 },
	{ 0x2801, 0x6a,  397 }, { 0x2c01, 0x6b,  406 }, { 0x3001, 0x6c,  415 },
	{ 0x3401, 0x6d,  424 }, { 0x3801, 0x6e,  433 }, { 0x3c01, 0x6f,  443 },
	{ 0x4001, 0x70,  453 }, { 0x4401, 0x71,  462 }, { 0x4801, 0x72,  473 },
	{ 0x4c01, 0x73,  483 }, { 0x5001, 0x74,  494 }, { 0x5401, 0x75,  504 },
	{ 0x5801, 0x76,  515 }, { 0x5c01, 0x77,  527 }, { 0x6001, 0x78,  538 },
	{ 0x6401, 0x79,  550 }, { 0x6801, 0x7a,  562 }, { 0x6c01, 0x7b,  574 },
	{ 0x7001, 0x7c,  587 }, { 0x7401, 0x7d,  600 }, { 0x7801, 0x7e,  613 },
	{ 0x7c01, 0x7f,  626 }, { 0x8001, 0x00,  640 }, { 0x8401, 0x00,  654 },
	{ 0x8801, 0x00,  668 }, { 0x8c01, 0x00,  683 }, { 0x9001, 0x00,  698 },
	{ 0x9401, 0x00,  713 }, { 0x9801, 0x00,  729 }, { 0x9c01, 0x00,  745 },
	{ 0xa001, 0x00,  761 }, { 0xa401, 0x00,  778 }, { 0xa801, 0x00,  795 },
	{ 0xac01, 0x00,  812 }, { 0xb001, 0x00,  830 }, { 0xb401, 0x00,  848 },
	{ 0xb801, 0x00,  867 }, { 0xbc01, 0x00,  886 }, { 0xc001, 0x00,  905 },
	{ 0xc401, 0x00,  925 }, { 0xc801, 0x00,  945 }, { 0xcc01, 0x00,  966 },
	{ 0xd001, 0x00,  987 }, { 0xd401, 0x00, 1009 }, { 0xd801, 0x00, 1031 },
	{ 0xdc01, 0x00, 1053 }, { 0xe001, 0x00, 1076 }, { 0xe401, 0x00, 1100 },
	{ 0xe801, 0x00, 1124 }, { 0xec01, 0x00, 1149 }, { 0xf001, 0x00, 1174 },
	{ 0xf401, 0x00, 1199 }, { 0xf801, 0x00, 1226 }, { 0xfc01, 0x00, 1253 }
};

#define joycon_max_rumble_amp	(1003)
static const struct joycon_rumble_amp_data joycon_rumble_amplitudes[] = {
	/* high, low, amp */
	{ 0x00, 0x0040,    0 },
	{ 0x02, 0x8040,   10 }, { 0x04, 0x0041,   12 }, { 0x06, 0x8041,   14 },
	{ 0x08, 0x0042,   17 }, { 0x0a, 0x8042,   20 }, { 0x0c, 0x0043,   24 },
	{ 0x0e, 0x8043,   28 }, { 0x10, 0x0044,   33 }, { 0x12, 0x8044,   40 },
	{ 0x14, 0x0045,   47 }, { 0x16, 0x8045,   56 }, { 0x18, 0x0046,   67 },
	{ 0x1a, 0x8046,   80 }, { 0x1c, 0x0047,   95 }, { 0x1e, 0x8047,  112 },
	{ 0x20, 0x0048,  117 }, { 0x22, 0x8048,  123 }, { 0x24, 0x0049,  128 },
	{ 0x26, 0x8049,  134 }, { 0x28, 0x004a,  140 }, { 0x2a, 0x804a,  146 },
	{ 0x2c, 0x004b,  152 }, { 0x2e, 0x804b,  159 }, { 0x30, 0x004c,  166 },
	{ 0x32, 0x804c,  173 }, { 0x34, 0x004d,  181 }, { 0x36, 0x804d,  189 },
	{ 0x38, 0x004e,  198 }, { 0x3a, 0x804e,  206 }, { 0x3c, 0x004f,  215 },
	{ 0x3e, 0x804f,  225 }, { 0x40, 0x0050,  230 }, { 0x42, 0x8050,  235 },
	{ 0x44, 0x0051,  240 }, { 0x46, 0x8051,  245 }, { 0x48, 0x0052,  251 },
	{ 0x4a, 0x8052,  256 }, { 0x4c, 0x0053,  262 }, { 0x4e, 0x8053,  268 },
	{ 0x50, 0x0054,  273 }, { 0x52, 0x8054,  279 }, { 0x54, 0x0055,  286 },
	{ 0x56, 0x8055,  292 }, { 0x58, 0x0056,  298 }, { 0x5a, 0x8056,  305 },
	{ 0x5c, 0x0057,  311 }, { 0x5e, 0x8057,  318 }, { 0x60, 0x0058,  325 },
	{ 0x62, 0x8058,  332 }, { 0x64, 0x0059,  340 }, { 0x66, 0x8059,  347 },
	{ 0x68, 0x005a,  355 }, { 0x6a, 0x805a,  362 }, { 0x6c, 0x005b,  370 },
	{ 0x6e, 0x805b,  378 }, { 0x70, 0x005c,  387 }, { 0x72, 0x805c,  395 },
	{ 0x74, 0x005d,  404 }, { 0x76, 0x805d,  413 }, { 0x78, 0x005e,  422 },
	{ 0x7a, 0x805e,  431 }, { 0x7c, 0x005f,  440 }, { 0x7e, 0x805f,  450 },
	{ 0x80, 0x0060,  460 }, { 0x82, 0x8060,  470 }, { 0x84, 0x0061,  480 },
	{ 0x86, 0x8061,  491 }, { 0x88, 0x0062,  501 }, { 0x8a, 0x8062,  512 },
	{ 0x8c, 0x0063,  524 }, { 0x8e, 0x8063,  535 }, { 0x90, 0x0064,  547 },
	{ 0x92, 0x8064,  559 }, { 0x94, 0x0065,  571 }, { 0x96, 0x8065,  584 },
	{ 0x98, 0x0066,  596 }, { 0x9a, 0x8066,  609 }, { 0x9c, 0x0067,  623 },
	{ 0x9e, 0x8067,  636 }, { 0xa0, 0x0068,  650 }, { 0xa2, 0x8068,  665 },
	{ 0xa4, 0x0069,  679 }, { 0xa6, 0x8069,  694 }, { 0xa8, 0x006a,  709 },
	{ 0xaa, 0x806a,  725 }, { 0xac, 0x006b,  741 }, { 0xae, 0x806b,  757 },
	{ 0xb0, 0x006c,  773 }, { 0xb2, 0x806c,  790 }, { 0xb4, 0x006d,  808 },
	{ 0xb6, 0x806d,  825 }, { 0xb8, 0x006e,  843 }, { 0xba, 0x806e,  862 },
	{ 0xbc, 0x006f,  881 }, { 0xbe, 0x806f,  900 }, { 0xc0, 0x0070,  920 },
	{ 0xc2, 0x8070,  940 }, { 0xc4, 0x0071,  960 }, { 0xc6, 0x8071,  981 },
	{ 0xc8, 0x0072, joycon_max_rumble_amp }
};
static const u16 JC_RUMBLE_DFLT_LOW_FREQ = 160;
static const u16 JC_RUMBLE_DFLT_HIGH_FREQ = 320;
#endif /* IS_ENABLED(CONFIG_NINTENDO_FF) */
static const u16 JC_RUMBLE_PERIOD_MS = 50;

/* States for controller state machine */
enum joycon_ctlr_state {
	JOYCON_CTLR_STATE_INIT,
	JOYCON_CTLR_STATE_READ,
	JOYCON_CTLR_STATE_REMOVED,
};

/* Controller type received as part of device info */
enum joycon_ctlr_type {
	JOYCON_CTLR_TYPE_JCL = 0x01,
	JOYCON_CTLR_TYPE_JCR = 0x02,
	JOYCON_CTLR_TYPE_PRO = 0x03,
};

struct joycon_stick_cal {
	s32 max;
	s32 min;
	s32 center;
};

/*
 * All the controller's button values are stored in a u32.
 * They can be accessed with bitwise ANDs.
 */
static const u32 JC_BTN_Y	= BIT(0);
static const u32 JC_BTN_X	= BIT(1);
static const u32 JC_BTN_B	= BIT(2);
static const u32 JC_BTN_A	= BIT(3);
static const u32 JC_BTN_SR_R	= BIT(4);
static const u32 JC_BTN_SL_R	= BIT(5);
static const u32 JC_BTN_R	= BIT(6);
static const u32 JC_BTN_ZR	= BIT(7);
static const u32 JC_BTN_MINUS	= BIT(8);
static const u32 JC_BTN_PLUS	= BIT(9);
static const u32 JC_BTN_RSTICK	= BIT(10);
static const u32 JC_BTN_LSTICK	= BIT(11);
static const u32 JC_BTN_HOME	= BIT(12);
static const u32 JC_BTN_CAP	= BIT(13); /* capture button */
static const u32 JC_BTN_DOWN	= BIT(16);
static const u32 JC_BTN_UP	= BIT(17);
static const u32 JC_BTN_RIGHT	= BIT(18);
static const u32 JC_BTN_LEFT	= BIT(19);
static const u32 JC_BTN_SR_L	= BIT(20);
static const u32 JC_BTN_SL_L	= BIT(21);
static const u32 JC_BTN_L	= BIT(22);
static const u32 JC_BTN_ZL	= BIT(23);

enum joycon_msg_type {
	JOYCON_MSG_TYPE_NONE,
	JOYCON_MSG_TYPE_USB,
	JOYCON_MSG_TYPE_SUBCMD,
};

struct joycon_rumble_output {
	u8 output_id;
	u8 packet_num;
	u8 rumble_data[8];
} __packed;

struct joycon_subcmd_request {
	u8 output_id; /* must be 0x01 for subcommand, 0x10 for rumble only */
	u8 packet_num; /* incremented every send */
	u8 rumble_data[8];
	u8 subcmd_id;
	u8 data[]; /* length depends on the subcommand */
} __packed;

struct joycon_subcmd_reply {
	u8 ack; /* MSB 1 for ACK, 0 for NACK */
	u8 id; /* id of requested subcmd */
	u8 data[]; /* will be at most 35 bytes */
} __packed;

struct joycon_input_report {
	u8 id;
	u8 timer;
	u8 bat_con; /* battery and connection info */
	u8 button_status[3];
	u8 left_stick[3];
	u8 right_stick[3];
	u8 vibrator_report;

	/*
	 * If support for firmware updates, gyroscope data, and/or NFC/IR
	 * are added in the future, this can be swapped for a union.
	 */
	struct joycon_subcmd_reply reply;
} __packed;

#define JC_MAX_RESP_SIZE	(sizeof(struct joycon_input_report) + 35)
#define JC_RUMBLE_DATA_SIZE	8
#define JC_RUMBLE_QUEUE_SIZE	8

static const unsigned short JC_RUMBLE_ZERO_AMP_PKT_CNT = 5;

/* Each physical controller is associated with a joycon_ctlr struct */
struct joycon_ctlr {
	struct hid_device *hdev;
	struct input_dev *input;
	enum joycon_ctlr_state ctlr_state;
	spinlock_t lock;
	u8 mac_addr[6];
	char *mac_addr_str;
	enum joycon_ctlr_type ctlr_type;

	/* The following members are used for synchronous sends/receives */
	enum joycon_msg_type msg_type;
	u8 subcmd_num;
	struct mutex output_mutex;
	u8 input_buf[JC_MAX_RESP_SIZE];
	wait_queue_head_t wait;
	bool received_resp;
	u8 usb_ack_match;
	u8 subcmd_ack_match;
	bool received_input_report;
	unsigned int last_subcmd_sent_msecs;

	/* factory calibration data */
	struct joycon_stick_cal left_stick_cal_x;
	struct joycon_stick_cal left_stick_cal_y;
	struct joycon_stick_cal right_stick_cal_x;
	struct joycon_stick_cal right_stick_cal_y;

	/* power supply data */
	struct power_supply *battery;
	struct power_supply_desc battery_desc;
	u8 battery_capacity;
	bool battery_charging;
	bool host_powered;

	/* rumble */
	u8 rumble_data[JC_RUMBLE_QUEUE_SIZE][JC_RUMBLE_DATA_SIZE];
	int rumble_queue_head;
	int rumble_queue_tail;
	struct workqueue_struct *rumble_queue;
	struct work_struct rumble_worker;
	unsigned int rumble_msecs;
	u16 rumble_ll_freq;
	u16 rumble_lh_freq;
	u16 rumble_rl_freq;
	u16 rumble_rh_freq;
	unsigned short rumble_zero_countdown;
};

/* Helper macros for checking controller type */
#define jc_type_is_joycon(ctlr) \
	(ctlr->hdev->product == USB_DEVICE_ID_NINTENDO_JOYCONL || \
	 ctlr->hdev->product == USB_DEVICE_ID_NINTENDO_JOYCONR || \
	 ctlr->hdev->product == USB_DEVICE_ID_NINTENDO_CHRGGRIP)
#define jc_type_is_procon(ctlr) \
	(ctlr->hdev->product == USB_DEVICE_ID_NINTENDO_PROCON)
#define jc_type_is_chrggrip(ctlr) \
	(ctlr->hdev->product == USB_DEVICE_ID_NINTENDO_CHRGGRIP)

/* Does this controller have inputs associated with left joycon? */
#define jc_type_has_left(ctlr) \
	(ctlr->ctlr_type == JOYCON_CTLR_TYPE_JCL || \
	 ctlr->ctlr_type == JOYCON_CTLR_TYPE_PRO)

/* Does this controller have inputs associated with right joycon? */
#define jc_type_has_right(ctlr) \
	(ctlr->ctlr_type == JOYCON_CTLR_TYPE_JCR || \
	 ctlr->ctlr_type == JOYCON_CTLR_TYPE_PRO)

static int __joycon_hid_send(struct hid_device *hdev, u8 *data, size_t len)
{
	u8 *buf;
	int ret;

	buf = kmemdup(data, len, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	ret = hid_hw_output_report(hdev, buf, len);
	kfree(buf);
	if (ret < 0)
		hid_dbg(hdev, "Failed to send output report ret=%d\n", ret);
	return ret;
}

static void joycon_wait_for_input_report(struct joycon_ctlr *ctlr)
{
	int ret;

	/*
	 * If we are in the proper reporting mode, wait for an input
	 * report prior to sending the subcommand. This improves
	 * reliability considerably.
	 */
	if (ctlr->ctlr_state == JOYCON_CTLR_STATE_READ) {
		unsigned long flags;

		spin_lock_irqsave(&ctlr->lock, flags);
		ctlr->received_input_report = false;
		spin_unlock_irqrestore(&ctlr->lock, flags);
		ret = wait_event_timeout(ctlr->wait,
					 ctlr->received_input_report,
					 HZ / 4);
		/* We will still proceed, even with a timeout here */
		if (!ret)
			hid_warn(ctlr->hdev,
				 "timeout waiting for input report\n");
	}
}

/*
 * Sending subcommands and/or rumble data at too high a rate can cause bluetooth
 * controller disconnections.
 */
static void joycon_enforce_subcmd_rate(struct joycon_ctlr *ctlr)
{
	static const unsigned int max_subcmd_rate_ms = 25;
	unsigned int current_ms = jiffies_to_msecs(jiffies);
	unsigned int delta_ms = current_ms - ctlr->last_subcmd_sent_msecs;

	while (delta_ms < max_subcmd_rate_ms &&
	       ctlr->ctlr_state == JOYCON_CTLR_STATE_READ) {
		joycon_wait_for_input_report(ctlr);
		current_ms = jiffies_to_msecs(jiffies);
		delta_ms = current_ms - ctlr->last_subcmd_sent_msecs;
	}
	ctlr->last_subcmd_sent_msecs = current_ms;
}

static int joycon_hid_send_sync(struct joycon_ctlr *ctlr, u8 *data, size_t len,
				u32 timeout)
{
	int ret;
	int tries = 2;

	/*
	 * The controller occasionally seems to drop subcommands. In testing,
	 * doing one retry after a timeout appears to always work.
	 */
	while (tries--) {
		joycon_enforce_subcmd_rate(ctlr);

		ret = __joycon_hid_send(ctlr->hdev, data, len);
		if (ret < 0) {
			memset(ctlr->input_buf, 0, JC_MAX_RESP_SIZE);
			return ret;
		}

		ret = wait_event_timeout(ctlr->wait, ctlr->received_resp,
					 timeout);
		if (!ret) {
			hid_dbg(ctlr->hdev,
				"synchronous send/receive timed out\n");
			if (tries) {
				hid_dbg(ctlr->hdev,
					"retrying sync send after timeout\n");
			}
			memset(ctlr->input_buf, 0, JC_MAX_RESP_SIZE);
			ret = -ETIMEDOUT;
		} else {
			ret = 0;
			break;
		}
	}

	ctlr->received_resp = false;
	return ret;
}

static int joycon_send_usb(struct joycon_ctlr *ctlr, u8 cmd, u32 timeout)
{
	int ret;
	u8 buf[2] = {JC_OUTPUT_USB_CMD};

	buf[1] = cmd;
	ctlr->usb_ack_match = cmd;
	ctlr->msg_type = JOYCON_MSG_TYPE_USB;
	ret = joycon_hid_send_sync(ctlr, buf, sizeof(buf), timeout);
	if (ret)
		hid_dbg(ctlr->hdev, "send usb command failed; ret=%d\n", ret);
	return ret;
}

static int joycon_send_subcmd(struct joycon_ctlr *ctlr,
			      struct joycon_subcmd_request *subcmd,
			      size_t data_len, u32 timeout)
{
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&ctlr->lock, flags);
	/*
	 * If the controller has been removed, just return ENODEV so the LED
	 * subsystem doesn't print invalid errors on removal.
	 */
	if (ctlr->ctlr_state == JOYCON_CTLR_STATE_REMOVED) {
		spin_unlock_irqrestore(&ctlr->lock, flags);
		return -ENODEV;
	}
	memcpy(subcmd->rumble_data, ctlr->rumble_data[ctlr->rumble_queue_tail],
	       JC_RUMBLE_DATA_SIZE);
	spin_unlock_irqrestore(&ctlr->lock, flags);

	subcmd->output_id = JC_OUTPUT_RUMBLE_AND_SUBCMD;
	subcmd->packet_num = ctlr->subcmd_num;
	if (++ctlr->subcmd_num > 0xF)
		ctlr->subcmd_num = 0;
	ctlr->subcmd_ack_match = subcmd->subcmd_id;
	ctlr->msg_type = JOYCON_MSG_TYPE_SUBCMD;

	ret = joycon_hid_send_sync(ctlr, (u8 *)subcmd,
				   sizeof(*subcmd) + data_len, timeout);
	if (ret < 0)
		hid_dbg(ctlr->hdev, "send subcommand failed; ret=%d\n", ret);
	else
		ret = 0;
	return ret;
}

static const u16 DFLT_STICK_CAL_CEN = 2000;
static const u16 DFLT_STICK_CAL_MAX = 3500;
static const u16 DFLT_STICK_CAL_MIN = 500;
static int joycon_request_calibration(struct joycon_ctlr *ctlr)
{
	struct joycon_subcmd_request *req;
	u8 buffer[sizeof(*req) + 5] = { 0 };
	struct joycon_input_report *report;
	struct joycon_stick_cal *cal_x;
	struct joycon_stick_cal *cal_y;
	s32 x_max_above;
	s32 x_min_below;
	s32 y_max_above;
	s32 y_min_below;
	u8 *data;
	u8 *raw_cal;
	int ret;

	req = (struct joycon_subcmd_request *)buffer;
	req->subcmd_id = JC_SUBCMD_SPI_FLASH_READ;
	data = req->data;
	data[0] = 0xFF & JC_CAL_DATA_START;
	data[1] = 0xFF & (JC_CAL_DATA_START >> 8);
	data[2] = 0xFF & (JC_CAL_DATA_START >> 16);
	data[3] = 0xFF & (JC_CAL_DATA_START >> 24);
	data[4] = JC_CAL_DATA_SIZE;

	hid_dbg(ctlr->hdev, "requesting cal data\n");
	ret = joycon_send_subcmd(ctlr, req, 5, HZ);
	if (ret) {
		hid_warn(ctlr->hdev,
			 "Failed to read stick cal, using defaults; ret=%d\n",
			 ret);

		ctlr->left_stick_cal_x.center = DFLT_STICK_CAL_CEN;
		ctlr->left_stick_cal_x.max = DFLT_STICK_CAL_MAX;
		ctlr->left_stick_cal_x.min = DFLT_STICK_CAL_MIN;

		ctlr->left_stick_cal_y.center = DFLT_STICK_CAL_CEN;
		ctlr->left_stick_cal_y.max = DFLT_STICK_CAL_MAX;
		ctlr->left_stick_cal_y.min = DFLT_STICK_CAL_MIN;

		ctlr->right_stick_cal_x.center = DFLT_STICK_CAL_CEN;
		ctlr->right_stick_cal_x.max = DFLT_STICK_CAL_MAX;
		ctlr->right_stick_cal_x.min = DFLT_STICK_CAL_MIN;

		ctlr->right_stick_cal_y.center = DFLT_STICK_CAL_CEN;
		ctlr->right_stick_cal_y.max = DFLT_STICK_CAL_MAX;
		ctlr->right_stick_cal_y.min = DFLT_STICK_CAL_MIN;

		return ret;
	}

	report = (struct joycon_input_report *)ctlr->input_buf;
	raw_cal = &report->reply.data[5];

	/* left stick calibration parsing */
	cal_x = &ctlr->left_stick_cal_x;
	cal_y = &ctlr->left_stick_cal_y;

	x_max_above = hid_field_extract(ctlr->hdev, (raw_cal + 0), 0, 12);
	y_max_above = hid_field_extract(ctlr->hdev, (raw_cal + 1), 4, 12);
	cal_x->center = hid_field_extract(ctlr->hdev, (raw_cal + 3), 0, 12);
	cal_y->center = hid_field_extract(ctlr->hdev, (raw_cal + 4), 4, 12);
	x_min_below = hid_field_extract(ctlr->hdev, (raw_cal + 6), 0, 12);
	y_min_below = hid_field_extract(ctlr->hdev, (raw_cal + 7), 4, 12);
	cal_x->max = cal_x->center + x_max_above;
	cal_x->min = cal_x->center - x_min_below;
	cal_y->max = cal_y->center + y_max_above;
	cal_y->min = cal_y->center - y_min_below;

	/* right stick calibration parsing */
	raw_cal += 9;
	cal_x = &ctlr->right_stick_cal_x;
	cal_y = &ctlr->right_stick_cal_y;

	cal_x->center = hid_field_extract(ctlr->hdev, (raw_cal + 0), 0, 12);
	cal_y->center = hid_field_extract(ctlr->hdev, (raw_cal + 1), 4, 12);
	x_min_below = hid_field_extract(ctlr->hdev, (raw_cal + 3), 0, 12);
	y_min_below = hid_field_extract(ctlr->hdev, (raw_cal + 4), 4, 12);
	x_max_above = hid_field_extract(ctlr->hdev, (raw_cal + 6), 0, 12);
	y_max_above = hid_field_extract(ctlr->hdev, (raw_cal + 7), 4, 12);
	cal_x->max = cal_x->center + x_max_above;
	cal_x->min = cal_x->center - x_min_below;
	cal_y->max = cal_y->center + y_max_above;
	cal_y->min = cal_y->center - y_min_below;

	hid_dbg(ctlr->hdev, "calibration:\n"
			    "l_x_c=%d l_x_max=%d l_x_min=%d\n"
			    "l_y_c=%d l_y_max=%d l_y_min=%d\n"
			    "r_x_c=%d r_x_max=%d r_x_min=%d\n"
			    "r_y_c=%d r_y_max=%d r_y_min=%d\n",
			    ctlr->left_stick_cal_x.center,
			    ctlr->left_stick_cal_x.max,
			    ctlr->left_stick_cal_x.min,
			    ctlr->left_stick_cal_y.center,
			    ctlr->left_stick_cal_y.max,
			    ctlr->left_stick_cal_y.min,
			    ctlr->right_stick_cal_x.center,
			    ctlr->right_stick_cal_x.max,
			    ctlr->right_stick_cal_x.min,
			    ctlr->right_stick_cal_y.center,
			    ctlr->right_stick_cal_y.max,
			    ctlr->right_stick_cal_y.min);

	return 0;
}

static int joycon_set_report_mode(struct joycon_ctlr *ctlr)
{
	struct joycon_subcmd_request *req;
	u8 buffer[sizeof(*req) + 1] = { 0 };

	req = (struct joycon_subcmd_request *)buffer;
	req->subcmd_id = JC_SUBCMD_SET_REPORT_MODE;
	req->data[0] = 0x30; /* standard, full report mode */

	hid_dbg(ctlr->hdev, "setting controller report mode\n");
	return joycon_send_subcmd(ctlr, req, 1, HZ);
}

static int joycon_enable_rumble(struct joycon_ctlr *ctlr)
{
	struct joycon_subcmd_request *req;
	u8 buffer[sizeof(*req) + 1] = { 0 };

	req = (struct joycon_subcmd_request *)buffer;
	req->subcmd_id = JC_SUBCMD_ENABLE_VIBRATION;
	req->data[0] = 0x01; /* note: 0x00 would disable */

	hid_dbg(ctlr->hdev, "enabling rumble\n");
	return joycon_send_subcmd(ctlr, req, 1, HZ/4);
}

static s32 joycon_map_stick_val(struct joycon_stick_cal *cal, s32 val)
{
	s32 center = cal->center;
	s32 min = cal->min;
	s32 max = cal->max;
	s32 new_val;

	if (val > center) {
		new_val = (val - center) * JC_MAX_STICK_MAG;
		new_val /= (max - center);
	} else {
		new_val = (center - val) * -JC_MAX_STICK_MAG;
		new_val /= (center - min);
	}
	new_val = clamp(new_val, (s32)-JC_MAX_STICK_MAG, (s32)JC_MAX_STICK_MAG);
	return new_val;
}

static void joycon_parse_report(struct joycon_ctlr *ctlr,
				struct joycon_input_report *rep)
{
	struct input_dev *dev = ctlr->input;
	unsigned long flags;
	u8 tmp;
	u32 btns;
	unsigned long msecs = jiffies_to_msecs(jiffies);

	spin_lock_irqsave(&ctlr->lock, flags);
	if (IS_ENABLED(CONFIG_NINTENDO_FF) && rep->vibrator_report &&
	    (msecs - ctlr->rumble_msecs) >= JC_RUMBLE_PERIOD_MS &&
	    (ctlr->rumble_queue_head != ctlr->rumble_queue_tail ||
	     ctlr->rumble_zero_countdown > 0)) {
		/*
		 * When this value reaches 0, we know we've sent multiple
		 * packets to the controller instructing it to disable rumble.
		 * We can safely stop sending periodic rumble packets until the
		 * next ff effect.
		 */
		if (ctlr->rumble_zero_countdown > 0)
			ctlr->rumble_zero_countdown--;
		queue_work(ctlr->rumble_queue, &ctlr->rumble_worker);
	}

	/* Parse the battery status */
	tmp = rep->bat_con;
	ctlr->host_powered = tmp & BIT(0);
	ctlr->battery_charging = tmp & BIT(4);
	tmp = tmp >> 5;
	switch (tmp) {
	case 0: /* empty */
		ctlr->battery_capacity = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
		break;
	case 1: /* low */
		ctlr->battery_capacity = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
		break;
	case 2: /* medium */
		ctlr->battery_capacity = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
		break;
	case 3: /* high */
		ctlr->battery_capacity = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
		break;
	case 4: /* full */
		ctlr->battery_capacity = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
		break;
	default:
		ctlr->battery_capacity = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
		hid_warn(ctlr->hdev, "Invalid battery status\n");
		break;
	}
	spin_unlock_irqrestore(&ctlr->lock, flags);

	/* Parse the buttons and sticks */
	btns = hid_field_extract(ctlr->hdev, rep->button_status, 0, 24);

	if (jc_type_has_left(ctlr)) {
		u16 raw_x;
		u16 raw_y;
		s32 x;
		s32 y;

		/* get raw stick values */
		raw_x = hid_field_extract(ctlr->hdev, rep->left_stick, 0, 12);
		raw_y = hid_field_extract(ctlr->hdev,
					  rep->left_stick + 1, 4, 12);
		/* map the stick values */
		x = joycon_map_stick_val(&ctlr->left_stick_cal_x, raw_x);
		y = -joycon_map_stick_val(&ctlr->left_stick_cal_y, raw_y);
		/* report sticks */
		input_report_abs(dev, ABS_X, x);
		input_report_abs(dev, ABS_Y, y);

		/* report buttons */
		input_report_key(dev, BTN_TL, btns & JC_BTN_L);
		input_report_key(dev, BTN_TL2, btns & JC_BTN_ZL);
		input_report_key(dev, BTN_SELECT, btns & JC_BTN_MINUS);
		input_report_key(dev, BTN_THUMBL, btns & JC_BTN_LSTICK);
		input_report_key(dev, BTN_Z, btns & JC_BTN_CAP);

		if (jc_type_is_joycon(ctlr)) {
			/* Report the S buttons as the non-existent triggers */
			input_report_key(dev, BTN_TR, btns & JC_BTN_SL_L);
			input_report_key(dev, BTN_TR2, btns & JC_BTN_SR_L);

			/* Report d-pad as digital buttons for the joy-cons */
			input_report_key(dev, BTN_DPAD_DOWN,
					 btns & JC_BTN_DOWN);
			input_report_key(dev, BTN_DPAD_UP, btns & JC_BTN_UP);
			input_report_key(dev, BTN_DPAD_RIGHT,
					 btns & JC_BTN_RIGHT);
			input_report_key(dev, BTN_DPAD_LEFT,
					 btns & JC_BTN_LEFT);
		} else {
			int hatx = 0;
			int haty = 0;

			/* d-pad x */
			if (btns & JC_BTN_LEFT)
				hatx = -1;
			else if (btns & JC_BTN_RIGHT)
				hatx = 1;
			input_report_abs(dev, ABS_HAT0X, hatx);

			/* d-pad y */
			if (btns & JC_BTN_UP)
				haty = -1;
			else if (btns & JC_BTN_DOWN)
				haty = 1;
			input_report_abs(dev, ABS_HAT0Y, haty);
		}
	}
	if (jc_type_has_right(ctlr)) {
		u16 raw_x;
		u16 raw_y;
		s32 x;
		s32 y;

		/* get raw stick values */
		raw_x = hid_field_extract(ctlr->hdev, rep->right_stick, 0, 12);
		raw_y = hid_field_extract(ctlr->hdev,
					  rep->right_stick + 1, 4, 12);
		/* map stick values */
		x = joycon_map_stick_val(&ctlr->right_stick_cal_x, raw_x);
		y = -joycon_map_stick_val(&ctlr->right_stick_cal_y, raw_y);
		/* report sticks */
		input_report_abs(dev, ABS_RX, x);
		input_report_abs(dev, ABS_RY, y);

		/* report buttons */
		input_report_key(dev, BTN_TR, btns & JC_BTN_R);
		input_report_key(dev, BTN_TR2, btns & JC_BTN_ZR);
		if (jc_type_is_joycon(ctlr)) {
			/* Report the S buttons as the non-existent triggers */
			input_report_key(dev, BTN_TL, btns & JC_BTN_SL_R);
			input_report_key(dev, BTN_TL2, btns & JC_BTN_SR_R);
		}
		input_report_key(dev, BTN_START, btns & JC_BTN_PLUS);
		input_report_key(dev, BTN_THUMBR, btns & JC_BTN_RSTICK);
		input_report_key(dev, BTN_MODE, btns & JC_BTN_HOME);
		input_report_key(dev, BTN_WEST, btns & JC_BTN_Y);
		input_report_key(dev, BTN_NORTH, btns & JC_BTN_X);
		input_report_key(dev, BTN_EAST, btns & JC_BTN_A);
		input_report_key(dev, BTN_SOUTH, btns & JC_BTN_B);
	}

	input_sync(dev);

	/*
	 * Immediately after receiving a report is the most reliable time to
	 * send a subcommand to the controller. Wake any subcommand senders
	 * waiting for a report.
	 */
	if (unlikely(mutex_is_locked(&ctlr->output_mutex))) {
		spin_lock_irqsave(&ctlr->lock, flags);
		ctlr->received_input_report = true;
		spin_unlock_irqrestore(&ctlr->lock, flags);
		wake_up(&ctlr->wait);
	}
}

static int joycon_send_rumble_data(struct joycon_ctlr *ctlr)
{
	int ret;
	unsigned long flags;
	struct joycon_rumble_output rumble_output = { 0 };

	spin_lock_irqsave(&ctlr->lock, flags);
	/*
	 * If the controller has been removed, just return ENODEV so the LED
	 * subsystem doesn't print invalid errors on removal.
	 */
	if (ctlr->ctlr_state == JOYCON_CTLR_STATE_REMOVED) {
		spin_unlock_irqrestore(&ctlr->lock, flags);
		return -ENODEV;
	}
	memcpy(rumble_output.rumble_data,
	       ctlr->rumble_data[ctlr->rumble_queue_tail],
	       JC_RUMBLE_DATA_SIZE);
	spin_unlock_irqrestore(&ctlr->lock, flags);

	rumble_output.output_id = JC_OUTPUT_RUMBLE_ONLY;
	rumble_output.packet_num = ctlr->subcmd_num;
	if (++ctlr->subcmd_num > 0xF)
		ctlr->subcmd_num = 0;

	joycon_enforce_subcmd_rate(ctlr);

	ret = __joycon_hid_send(ctlr->hdev, (u8 *)&rumble_output,
				sizeof(rumble_output));
	return ret;
}

static void joycon_rumble_worker(struct work_struct *work)
{
	struct joycon_ctlr *ctlr = container_of(work, struct joycon_ctlr,
							rumble_worker);
	unsigned long flags;
	bool again = true;
	int ret;

	while (again) {
		mutex_lock(&ctlr->output_mutex);
		ret = joycon_send_rumble_data(ctlr);
		mutex_unlock(&ctlr->output_mutex);

		/* -ENODEV means the controller was just unplugged */
		spin_lock_irqsave(&ctlr->lock, flags);
		if (ret < 0 && ret != -ENODEV &&
		    ctlr->ctlr_state != JOYCON_CTLR_STATE_REMOVED)
			hid_warn(ctlr->hdev, "Failed to set rumble; e=%d", ret);

		ctlr->rumble_msecs = jiffies_to_msecs(jiffies);
		if (ctlr->rumble_queue_tail != ctlr->rumble_queue_head) {
			if (++ctlr->rumble_queue_tail >= JC_RUMBLE_QUEUE_SIZE)
				ctlr->rumble_queue_tail = 0;
		} else {
			again = false;
		}
		spin_unlock_irqrestore(&ctlr->lock, flags);
	}
}

#if IS_ENABLED(CONFIG_NINTENDO_FF)
static struct joycon_rumble_freq_data joycon_find_rumble_freq(u16 freq)
{
	const size_t length = ARRAY_SIZE(joycon_rumble_frequencies);
	const struct joycon_rumble_freq_data *data = joycon_rumble_frequencies;
	int i = 0;

	if (freq > data[0].freq) {
		for (i = 1; i < length - 1; i++) {
			if (freq > data[i - 1].freq && freq <= data[i].freq)
				break;
		}
	}

	return data[i];
}

static struct joycon_rumble_amp_data joycon_find_rumble_amp(u16 amp)
{
	const size_t length = ARRAY_SIZE(joycon_rumble_amplitudes);
	const struct joycon_rumble_amp_data *data = joycon_rumble_amplitudes;
	int i = 0;

	if (amp > data[0].amp) {
		for (i = 1; i < length - 1; i++) {
			if (amp > data[i - 1].amp && amp <= data[i].amp)
				break;
		}
	}

	return data[i];
}

static void joycon_encode_rumble(u8 *data, u16 freq_low, u16 freq_high, u16 amp)
{
	struct joycon_rumble_freq_data freq_data_low;
	struct joycon_rumble_freq_data freq_data_high;
	struct joycon_rumble_amp_data amp_data;

	freq_data_low = joycon_find_rumble_freq(freq_low);
	freq_data_high = joycon_find_rumble_freq(freq_high);
	amp_data = joycon_find_rumble_amp(amp);

	data[0] = (freq_data_high.high >> 8) & 0xFF;
	data[1] = (freq_data_high.high & 0xFF) + amp_data.high;
	data[2] = freq_data_low.low + ((amp_data.low >> 8) & 0xFF);
	data[3] = amp_data.low & 0xFF;
}

static const u16 JOYCON_MAX_RUMBLE_HIGH_FREQ	= 1253;
static const u16 JOYCON_MIN_RUMBLE_HIGH_FREQ	= 82;
static const u16 JOYCON_MAX_RUMBLE_LOW_FREQ	= 626;
static const u16 JOYCON_MIN_RUMBLE_LOW_FREQ	= 41;

static void joycon_clamp_rumble_freqs(struct joycon_ctlr *ctlr)
{
	unsigned long flags;

	spin_lock_irqsave(&ctlr->lock, flags);
	ctlr->rumble_ll_freq = clamp(ctlr->rumble_ll_freq,
				     JOYCON_MIN_RUMBLE_LOW_FREQ,
				     JOYCON_MAX_RUMBLE_LOW_FREQ);
	ctlr->rumble_lh_freq = clamp(ctlr->rumble_lh_freq,
				     JOYCON_MIN_RUMBLE_HIGH_FREQ,
				     JOYCON_MAX_RUMBLE_HIGH_FREQ);
	ctlr->rumble_rl_freq = clamp(ctlr->rumble_rl_freq,
				     JOYCON_MIN_RUMBLE_LOW_FREQ,
				     JOYCON_MAX_RUMBLE_LOW_FREQ);
	ctlr->rumble_rh_freq = clamp(ctlr->rumble_rh_freq,
				     JOYCON_MIN_RUMBLE_HIGH_FREQ,
				     JOYCON_MAX_RUMBLE_HIGH_FREQ);
	spin_unlock_irqrestore(&ctlr->lock, flags);
}

static int joycon_set_rumble(struct joycon_ctlr *ctlr, u16 amp_r, u16 amp_l,
			     bool schedule_now)
{
	u8 data[JC_RUMBLE_DATA_SIZE];
	u16 amp;
	u16 freq_r_low;
	u16 freq_r_high;
	u16 freq_l_low;
	u16 freq_l_high;
	unsigned long flags;

	spin_lock_irqsave(&ctlr->lock, flags);
	freq_r_low = ctlr->rumble_rl_freq;
	freq_r_high = ctlr->rumble_rh_freq;
	freq_l_low = ctlr->rumble_ll_freq;
	freq_l_high = ctlr->rumble_lh_freq;
	/* limit number of silent rumble packets to reduce traffic */
	if (amp_l != 0 || amp_r != 0)
		ctlr->rumble_zero_countdown = JC_RUMBLE_ZERO_AMP_PKT_CNT;
	spin_unlock_irqrestore(&ctlr->lock, flags);

	/* right joy-con */
	amp = amp_r * (u32)joycon_max_rumble_amp / 65535;
	joycon_encode_rumble(data + 4, freq_r_low, freq_r_high, amp);

	/* left joy-con */
	amp = amp_l * (u32)joycon_max_rumble_amp / 65535;
	joycon_encode_rumble(data, freq_l_low, freq_l_high, amp);

	spin_lock_irqsave(&ctlr->lock, flags);
	if (++ctlr->rumble_queue_head >= JC_RUMBLE_QUEUE_SIZE)
		ctlr->rumble_queue_head = 0;
	memcpy(ctlr->rumble_data[ctlr->rumble_queue_head], data,
	       JC_RUMBLE_DATA_SIZE);
	spin_unlock_irqrestore(&ctlr->lock, flags);

	/* don't wait for the periodic send (reduces latency) */
	if (schedule_now)
		queue_work(ctlr->rumble_queue, &ctlr->rumble_worker);

	return 0;
}

static int joycon_play_effect(struct input_dev *dev, void *data,
						     struct ff_effect *effect)
{
	struct joycon_ctlr *ctlr = input_get_drvdata(dev);

	if (effect->type != FF_RUMBLE)
		return 0;

	return joycon_set_rumble(ctlr,
				 effect->u.rumble.weak_magnitude,
				 effect->u.rumble.strong_magnitude,
				 true);
}
#endif /* IS_ENABLED(CONFIG_NINTENDO_FF) */

static const unsigned int joycon_button_inputs_l[] = {
	BTN_SELECT, BTN_Z, BTN_THUMBL,
	BTN_TL, BTN_TL2,
	0 /* 0 signals end of array */
};

static const unsigned int joycon_button_inputs_r[] = {
	BTN_START, BTN_MODE, BTN_THUMBR,
	BTN_SOUTH, BTN_EAST, BTN_NORTH, BTN_WEST,
	BTN_TR, BTN_TR2,
	0 /* 0 signals end of array */
};

/* We report joy-con d-pad inputs as buttons and pro controller as a hat. */
static const unsigned int joycon_dpad_inputs_jc[] = {
	BTN_DPAD_UP, BTN_DPAD_DOWN, BTN_DPAD_LEFT, BTN_DPAD_RIGHT,
	0 /* 0 signals end of array */
};

static DEFINE_MUTEX(joycon_input_num_mutex);
static int joycon_input_create(struct joycon_ctlr *ctlr)
{
	struct hid_device *hdev;
	const char *name;
	int ret;
	int i;

	hdev = ctlr->hdev;

	switch (hdev->product) {
	case USB_DEVICE_ID_NINTENDO_PROCON:
		name = "Nintendo Switch Pro Controller";
		break;
	case USB_DEVICE_ID_NINTENDO_CHRGGRIP:
		if (jc_type_has_left(ctlr))
			name = "Nintendo Switch Left Joy-Con (Grip)";
		else
			name = "Nintendo Switch Right Joy-Con (Grip)";
		break;
	case USB_DEVICE_ID_NINTENDO_JOYCONL:
		name = "Nintendo Switch Left Joy-Con";
		break;
	case USB_DEVICE_ID_NINTENDO_JOYCONR:
		name = "Nintendo Switch Right Joy-Con";
		break;
	default: /* Should be impossible */
		hid_err(hdev, "Invalid hid product\n");
		return -EINVAL;
	}

	ctlr->input = devm_input_allocate_device(&hdev->dev);
	if (!ctlr->input)
		return -ENOMEM;
	ctlr->input->id.bustype = hdev->bus;
	ctlr->input->id.vendor = hdev->vendor;
	ctlr->input->id.product = hdev->product;
	ctlr->input->id.version = hdev->version;
	ctlr->input->uniq = ctlr->mac_addr_str;
	ctlr->input->name = name;
	input_set_drvdata(ctlr->input, ctlr);

	/* set up sticks and buttons */
	if (jc_type_has_left(ctlr)) {
		input_set_abs_params(ctlr->input, ABS_X,
				     -JC_MAX_STICK_MAG, JC_MAX_STICK_MAG,
				     JC_STICK_FUZZ, JC_STICK_FLAT);
		input_set_abs_params(ctlr->input, ABS_Y,
				     -JC_MAX_STICK_MAG, JC_MAX_STICK_MAG,
				     JC_STICK_FUZZ, JC_STICK_FLAT);

		for (i = 0; joycon_button_inputs_l[i] > 0; i++)
			input_set_capability(ctlr->input, EV_KEY,
					     joycon_button_inputs_l[i]);

		/* configure d-pad differently for joy-con vs pro controller */
		if (hdev->product != USB_DEVICE_ID_NINTENDO_PROCON) {
			for (i = 0; joycon_dpad_inputs_jc[i] > 0; i++)
				input_set_capability(ctlr->input, EV_KEY,
						     joycon_dpad_inputs_jc[i]);
		} else {
			input_set_abs_params(ctlr->input, ABS_HAT0X,
					     -JC_MAX_DPAD_MAG, JC_MAX_DPAD_MAG,
					     JC_DPAD_FUZZ, JC_DPAD_FLAT);
			input_set_abs_params(ctlr->input, ABS_HAT0Y,
					     -JC_MAX_DPAD_MAG, JC_MAX_DPAD_MAG,
					     JC_DPAD_FUZZ, JC_DPAD_FLAT);
		}
	}
	if (jc_type_has_right(ctlr)) {
		input_set_abs_params(ctlr->input, ABS_RX,
				     -JC_MAX_STICK_MAG, JC_MAX_STICK_MAG,
				     JC_STICK_FUZZ, JC_STICK_FLAT);
		input_set_abs_params(ctlr->input, ABS_RY,
				     -JC_MAX_STICK_MAG, JC_MAX_STICK_MAG,
				     JC_STICK_FUZZ, JC_STICK_FLAT);

		for (i = 0; joycon_button_inputs_r[i] > 0; i++)
			input_set_capability(ctlr->input, EV_KEY,
					     joycon_button_inputs_r[i]);
	}

	/* Let's report joy-con S triggers separately */
	if (hdev->product == USB_DEVICE_ID_NINTENDO_JOYCONL) {
		input_set_capability(ctlr->input, EV_KEY, BTN_TR);
		input_set_capability(ctlr->input, EV_KEY, BTN_TR2);
	} else if (hdev->product == USB_DEVICE_ID_NINTENDO_JOYCONR) {
		input_set_capability(ctlr->input, EV_KEY, BTN_TL);
		input_set_capability(ctlr->input, EV_KEY, BTN_TL2);
	}

#if IS_ENABLED(CONFIG_NINTENDO_FF)
	/* set up rumble */
	input_set_capability(ctlr->input, EV_FF, FF_RUMBLE);
	input_ff_create_memless(ctlr->input, NULL, joycon_play_effect);
	ctlr->rumble_ll_freq = JC_RUMBLE_DFLT_LOW_FREQ;
	ctlr->rumble_lh_freq = JC_RUMBLE_DFLT_HIGH_FREQ;
	ctlr->rumble_rl_freq = JC_RUMBLE_DFLT_LOW_FREQ;
	ctlr->rumble_rh_freq = JC_RUMBLE_DFLT_HIGH_FREQ;
	joycon_clamp_rumble_freqs(ctlr);
	joycon_set_rumble(ctlr, 0, 0, false);
	ctlr->rumble_msecs = jiffies_to_msecs(jiffies);
#endif

	ret = input_register_device(ctlr->input);
	if (ret)
		return ret;

	return 0;
}

static int joycon_battery_get_property(struct power_supply *supply,
				       enum power_supply_property prop,
				       union power_supply_propval *val)
{
	struct joycon_ctlr *ctlr = power_supply_get_drvdata(supply);
	unsigned long flags;
	int ret = 0;
	u8 capacity;
	bool charging;
	bool powered;

	spin_lock_irqsave(&ctlr->lock, flags);
	capacity = ctlr->battery_capacity;
	charging = ctlr->battery_charging;
	powered = ctlr->host_powered;
	spin_unlock_irqrestore(&ctlr->lock, flags);

	switch (prop) {
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = 1;
		break;
	case POWER_SUPPLY_PROP_SCOPE:
		val->intval = POWER_SUPPLY_SCOPE_DEVICE;
		break;
	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
		val->intval = capacity;
		break;
	case POWER_SUPPLY_PROP_STATUS:
		if (charging)
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else if (capacity == POWER_SUPPLY_CAPACITY_LEVEL_FULL &&
			 powered)
			val->intval = POWER_SUPPLY_STATUS_FULL;
		else
			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		break;
	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}

static enum power_supply_property joycon_battery_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_SCOPE,
	POWER_SUPPLY_PROP_STATUS,
};

static int joycon_power_supply_create(struct joycon_ctlr *ctlr)
{
	struct hid_device *hdev = ctlr->hdev;
	struct power_supply_config supply_config = { .drv_data = ctlr, };
	const char * const name_fmt = "nintendo_switch_controller_battery_%s";
	int ret = 0;

	/* Set initially to unknown before receiving first input report */
	ctlr->battery_capacity = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;

	/* Configure the battery's description */
	ctlr->battery_desc.properties = joycon_battery_props;
	ctlr->battery_desc.num_properties =
					ARRAY_SIZE(joycon_battery_props);
	ctlr->battery_desc.get_property = joycon_battery_get_property;
	ctlr->battery_desc.type = POWER_SUPPLY_TYPE_BATTERY;
	ctlr->battery_desc.use_for_apm = 0;
	ctlr->battery_desc.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
						 name_fmt,
						 dev_name(&hdev->dev));
	if (!ctlr->battery_desc.name)
		return -ENOMEM;

	ctlr->battery = devm_power_supply_register(&hdev->dev,
						   &ctlr->battery_desc,
						   &supply_config);
	if (IS_ERR(ctlr->battery)) {
		ret = PTR_ERR(ctlr->battery);
		hid_err(hdev, "Failed to register battery; ret=%d\n", ret);
		return ret;
	}

	return power_supply_powers(ctlr->battery, &hdev->dev);
}

static int joycon_read_info(struct joycon_ctlr *ctlr)
{
	int ret;
	int i;
	int j;
	struct joycon_subcmd_request req = { 0 };
	struct joycon_input_report *report;

	req.subcmd_id = JC_SUBCMD_REQ_DEV_INFO;
	ret = joycon_send_subcmd(ctlr, &req, 0, HZ);
	if (ret) {
		hid_err(ctlr->hdev, "Failed to get joycon info; ret=%d\n", ret);
		return ret;
	}

	report = (struct joycon_input_report *)ctlr->input_buf;

	for (i = 4, j = 0; j < 6; i++, j++)
		ctlr->mac_addr[j] = report->reply.data[i];

	ctlr->mac_addr_str = devm_kasprintf(&ctlr->hdev->dev, GFP_KERNEL,
					    "%02X:%02X:%02X:%02X:%02X:%02X",
					    ctlr->mac_addr[0],
					    ctlr->mac_addr[1],
					    ctlr->mac_addr[2],
					    ctlr->mac_addr[3],
					    ctlr->mac_addr[4],
					    ctlr->mac_addr[5]);
	if (!ctlr->mac_addr_str)
		return -ENOMEM;
	hid_info(ctlr->hdev, "controller MAC = %s\n", ctlr->mac_addr_str);

	/* Retrieve the type so we can distinguish for charging grip */
	ctlr->ctlr_type = report->reply.data[2];

	return 0;
}

/* Common handler for parsing inputs */
static int joycon_ctlr_read_handler(struct joycon_ctlr *ctlr, u8 *data,
							      int size)
{
	if (data[0] == JC_INPUT_SUBCMD_REPLY || data[0] == JC_INPUT_IMU_DATA ||
	    data[0] == JC_INPUT_MCU_DATA) {
		if (size >= 12) /* make sure it contains the input report */
			joycon_parse_report(ctlr,
					    (struct joycon_input_report *)data);
	}

	return 0;
}

static int joycon_ctlr_handle_event(struct joycon_ctlr *ctlr, u8 *data,
							      int size)
{
	int ret = 0;
	bool match = false;
	struct joycon_input_report *report;

	if (unlikely(mutex_is_locked(&ctlr->output_mutex)) &&
	    ctlr->msg_type != JOYCON_MSG_TYPE_NONE) {
		switch (ctlr->msg_type) {
		case JOYCON_MSG_TYPE_USB:
			if (size < 2)
				break;
			if (data[0] == JC_INPUT_USB_RESPONSE &&
			    data[1] == ctlr->usb_ack_match)
				match = true;
			break;
		case JOYCON_MSG_TYPE_SUBCMD:
			if (size < sizeof(struct joycon_input_report) ||
			    data[0] != JC_INPUT_SUBCMD_REPLY)
				break;
			report = (struct joycon_input_report *)data;
			if (report->reply.id == ctlr->subcmd_ack_match)
				match = true;
			break;
		default:
			break;
		}

		if (match) {
			memcpy(ctlr->input_buf, data,
			       min(size, (int)JC_MAX_RESP_SIZE));
			ctlr->msg_type = JOYCON_MSG_TYPE_NONE;
			ctlr->received_resp = true;
			wake_up(&ctlr->wait);

			/* This message has been handled */
			return 1;
		}
	}

	if (ctlr->ctlr_state == JOYCON_CTLR_STATE_READ)
		ret = joycon_ctlr_read_handler(ctlr, data, size);

	return ret;
}

static int nintendo_hid_event(struct hid_device *hdev,
			      struct hid_report *report, u8 *raw_data, int size)
{
	struct joycon_ctlr *ctlr = hid_get_drvdata(hdev);

	if (size < 1)
		return -EINVAL;

	return joycon_ctlr_handle_event(ctlr, raw_data, size);
}

static int nintendo_hid_probe(struct hid_device *hdev,
			    const struct hid_device_id *id)
{
	int ret;
	struct joycon_ctlr *ctlr;

	hid_dbg(hdev, "probe - start\n");

	ctlr = devm_kzalloc(&hdev->dev, sizeof(*ctlr), GFP_KERNEL);
	if (!ctlr) {
		ret = -ENOMEM;
		goto err;
	}

	ctlr->hdev = hdev;
	ctlr->ctlr_state = JOYCON_CTLR_STATE_INIT;
	ctlr->rumble_queue_head = JC_RUMBLE_QUEUE_SIZE - 1;
	ctlr->rumble_queue_tail = 0;
	hid_set_drvdata(hdev, ctlr);
	mutex_init(&ctlr->output_mutex);
	init_waitqueue_head(&ctlr->wait);
	spin_lock_init(&ctlr->lock);
	ctlr->rumble_queue = alloc_workqueue("hid-nintendo-rumble_wq",
					     WQ_FREEZABLE | WQ_MEM_RECLAIM, 0);
	if (!ctlr->rumble_queue) {
		ret = -ENOMEM;
		goto err;
	}
	INIT_WORK(&ctlr->rumble_worker, joycon_rumble_worker);

	ret = hid_parse(hdev);
	if (ret) {
		hid_err(hdev, "HID parse failed\n");
		goto err_wq;
	}

	/*
	 * Patch the hw version of pro controller/joycons, so applications can
	 * distinguish between the default HID mappings and the mappings defined
	 * by the Linux game controller spec. This is important for the SDL2
	 * library, which has a game controller database, which uses device ids
	 * in combination with version as a key.
	 */
	hdev->version |= 0x8000;

	ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
	if (ret) {
		hid_err(hdev, "HW start failed\n");
		goto err_wq;
	}

	ret = hid_hw_open(hdev);
	if (ret) {
		hid_err(hdev, "cannot start hardware I/O\n");
		goto err_stop;
	}

	hid_device_io_start(hdev);

	/* Initialize the controller */
	mutex_lock(&ctlr->output_mutex);
	/* if handshake command fails, assume ble pro controller */
	if ((jc_type_is_procon(ctlr) || jc_type_is_chrggrip(ctlr)) &&
	    !joycon_send_usb(ctlr, JC_USB_CMD_HANDSHAKE, HZ)) {
		hid_dbg(hdev, "detected USB controller\n");
		/* set baudrate for improved latency */
		ret = joycon_send_usb(ctlr, JC_USB_CMD_BAUDRATE_3M, HZ);
		if (ret) {
			hid_err(hdev, "Failed to set baudrate; ret=%d\n", ret);
			goto err_mutex;
		}
		/* handshake */
		ret = joycon_send_usb(ctlr, JC_USB_CMD_HANDSHAKE, HZ);
		if (ret) {
			hid_err(hdev, "Failed handshake; ret=%d\n", ret);
			goto err_mutex;
		}
		/*
		 * Set no timeout (to keep controller in USB mode).
		 * This doesn't send a response, so ignore the timeout.
		 */
		joycon_send_usb(ctlr, JC_USB_CMD_NO_TIMEOUT, HZ/10);
	} else if (jc_type_is_chrggrip(ctlr)) {
		hid_err(hdev, "Failed charging grip handshake\n");
		ret = -ETIMEDOUT;
		goto err_mutex;
	}

	/* get controller calibration data, and parse it */
	ret = joycon_request_calibration(ctlr);
	if (ret) {
		/*
		 * We can function with default calibration, but it may be
		 * inaccurate. Provide a warning, and continue on.
		 */
		hid_warn(hdev, "Analog stick positions may be inaccurate\n");
	}

	/* Set the reporting mode to 0x30, which is the full report mode */
	ret = joycon_set_report_mode(ctlr);
	if (ret) {
		hid_err(hdev, "Failed to set report mode; ret=%d\n", ret);
		goto err_mutex;
	}

	/* Enable rumble */
	ret = joycon_enable_rumble(ctlr);
	if (ret) {
		hid_err(hdev, "Failed to enable rumble; ret=%d\n", ret);
		goto err_mutex;
	}

	ret = joycon_read_info(ctlr);
	if (ret) {
		hid_err(hdev, "Failed to retrieve controller info; ret=%d\n",
			ret);
		goto err_mutex;
	}

	mutex_unlock(&ctlr->output_mutex);

	/* Initialize the battery power supply */
	ret = joycon_power_supply_create(ctlr);
	if (ret) {
		hid_err(hdev, "Failed to create power_supply; ret=%d\n", ret);
		goto err_close;
	}

	ret = joycon_input_create(ctlr);
	if (ret) {
		hid_err(hdev, "Failed to create input device; ret=%d\n", ret);
		goto err_close;
	}

	ctlr->ctlr_state = JOYCON_CTLR_STATE_READ;

	hid_dbg(hdev, "probe - success\n");
	return 0;

err_mutex:
	mutex_unlock(&ctlr->output_mutex);
err_close:
	hid_hw_close(hdev);
err_stop:
	hid_hw_stop(hdev);
err_wq:
	destroy_workqueue(ctlr->rumble_queue);
err:
	hid_err(hdev, "probe - fail = %d\n", ret);
	return ret;
}

static void nintendo_hid_remove(struct hid_device *hdev)
{
	struct joycon_ctlr *ctlr = hid_get_drvdata(hdev);
	unsigned long flags;

	hid_dbg(hdev, "remove\n");

	/* Prevent further attempts at sending subcommands. */
	spin_lock_irqsave(&ctlr->lock, flags);
	ctlr->ctlr_state = JOYCON_CTLR_STATE_REMOVED;
	spin_unlock_irqrestore(&ctlr->lock, flags);

	destroy_workqueue(ctlr->rumble_queue);

	hid_hw_close(hdev);
	hid_hw_stop(hdev);
}

static const struct hid_device_id nintendo_hid_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_NINTENDO,
			 USB_DEVICE_ID_NINTENDO_PROCON) },
	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_NINTENDO,
			 USB_DEVICE_ID_NINTENDO_PROCON) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_NINTENDO,
			 USB_DEVICE_ID_NINTENDO_CHRGGRIP) },
	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_NINTENDO,
			 USB_DEVICE_ID_NINTENDO_JOYCONL) },
	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_NINTENDO,
			 USB_DEVICE_ID_NINTENDO_JOYCONR) },
	{ }
};
MODULE_DEVICE_TABLE(hid, nintendo_hid_devices);

static struct hid_driver nintendo_hid_driver = {
	.name		= "nintendo",
	.id_table	= nintendo_hid_devices,
	.probe		= nintendo_hid_probe,
	.remove		= nintendo_hid_remove,
	.raw_event	= nintendo_hid_event,
};
module_hid_driver(nintendo_hid_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Daniel J. Ogorchock <djogorchock@gmail.com>");
MODULE_DESCRIPTION("Driver for Nintendo Switch Controllers");