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linux/drivers/hid/hid-nintendo.c
Daniel J. Ogorchock 1ff89e06c2 HID: nintendo: fix rumble worker null pointer deref 
We can dereference a null pointer trying to queue work to a destroyed
workqueue.

If the device is disconnected, nintendo_hid_remove is called, in which
the rumble_queue is destroyed. Avoid using that queue to defer rumble
work once the controller state is set to JOYCON_CTLR_STATE_REMOVED.

This eliminates the null pointer dereference.

Signed-off-by: Daniel J. Ogorchock <djogorchock@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2022-08-25 15:15:17 +02:00

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// 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 <asm/unaligned.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/jiffies.h>
#include <linux/leds.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
/* Magic value denoting presence of user calibration */
#define JC_CAL_USR_MAGIC_0 0xB2
#define JC_CAL_USR_MAGIC_1 0xA1
#define JC_CAL_USR_MAGIC_SIZE 2
/* SPI storage addresses of user calibration data */
#define JC_CAL_USR_LEFT_MAGIC_ADDR 0x8010
#define JC_CAL_USR_LEFT_DATA_ADDR 0x8012
#define JC_CAL_USR_LEFT_DATA_END 0x801A
#define JC_CAL_USR_RIGHT_MAGIC_ADDR 0x801B
#define JC_CAL_USR_RIGHT_DATA_ADDR 0x801D
#define JC_CAL_STICK_DATA_SIZE \
(JC_CAL_USR_LEFT_DATA_END - JC_CAL_USR_LEFT_DATA_ADDR + 1)
/* SPI storage addresses of factory calibration data */
#define JC_CAL_FCT_DATA_LEFT_ADDR 0x603d
#define JC_CAL_FCT_DATA_RIGHT_ADDR 0x6046
/* SPI storage addresses of IMU factory calibration data */
#define JC_IMU_CAL_FCT_DATA_ADDR 0x6020
#define JC_IMU_CAL_FCT_DATA_END 0x6037
#define JC_IMU_CAL_DATA_SIZE \
(JC_IMU_CAL_FCT_DATA_END - JC_IMU_CAL_FCT_DATA_ADDR + 1)
/* SPI storage addresses of IMU user calibration data */
#define JC_IMU_CAL_USR_MAGIC_ADDR 0x8026
#define JC_IMU_CAL_USR_DATA_ADDR 0x8028
/* 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
/* Under most circumstances IMU reports are pushed every 15ms; use as default */
#define JC_IMU_DFLT_AVG_DELTA_MS 15
/* How many samples to sum before calculating average IMU report delta */
#define JC_IMU_SAMPLES_PER_DELTA_AVG 300
/* Controls how many dropped IMU packets at once trigger a warning message */
#define JC_IMU_DROPPED_PKT_WARNING 3
/*
* The controller's accelerometer has a sensor resolution of 16bits and is
* configured with a range of +-8000 milliGs. Therefore, the resolution can be
* calculated thus: (2^16-1)/(8000 * 2) = 4.096 digits per milliG
* Resolution per G (rather than per millliG): 4.096 * 1000 = 4096 digits per G
* Alternatively: 1/4096 = .0002441 Gs per digit
*/
#define JC_IMU_MAX_ACCEL_MAG 32767
#define JC_IMU_ACCEL_RES_PER_G 4096
#define JC_IMU_ACCEL_FUZZ 10
#define JC_IMU_ACCEL_FLAT 0
/*
* The controller's gyroscope has a sensor resolution of 16bits and is
* configured with a range of +-2000 degrees/second.
* Digits per dps: (2^16 -1)/(2000*2) = 16.38375
* dps per digit: 16.38375E-1 = .0610
*
* STMicro recommends in the datasheet to add 15% to the dps/digit. This allows
* the full sensitivity range to be saturated without clipping. This yields more
* accurate results, so it's the technique this driver uses.
* dps per digit (corrected): .0610 * 1.15 = .0702
* digits per dps (corrected): .0702E-1 = 14.247
*
* Now, 14.247 truncating to 14 loses a lot of precision, so we rescale the
* min/max range by 1000.
*/
#define JC_IMU_PREC_RANGE_SCALE 1000
/* Note: change mag and res_per_dps if prec_range_scale is ever altered */
#define JC_IMU_MAX_GYRO_MAG 32767000 /* (2^16-1)*1000 */
#define JC_IMU_GYRO_RES_PER_DPS 14247 /* (14.247*1000) */
#define JC_IMU_GYRO_FUZZ 10
#define JC_IMU_GYRO_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;
static const unsigned short JC_RUMBLE_ZERO_AMP_PKT_CNT = 5;
#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;
};
struct joycon_imu_cal {
s16 offset[3];
s16 scale[3];
};
/*
* 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_imu_data {
s16 accel_x;
s16 accel_y;
s16 accel_z;
s16 gyro_x;
s16 gyro_y;
s16 gyro_z;
} __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;
union {
struct joycon_subcmd_reply subcmd_reply;
/* IMU input reports contain 3 samples */
u8 imu_raw_bytes[sizeof(struct joycon_imu_data) * 3];
};
} __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 char * const joycon_player_led_names[] = {
LED_FUNCTION_PLAYER1,
LED_FUNCTION_PLAYER2,
LED_FUNCTION_PLAYER3,
LED_FUNCTION_PLAYER4,
};
#define JC_NUM_LEDS ARRAY_SIZE(joycon_player_led_names)
/* Each physical controller is associated with a joycon_ctlr struct */
struct joycon_ctlr {
struct hid_device *hdev;
struct input_dev *input;
struct led_classdev leds[JC_NUM_LEDS]; /* player leds */
struct led_classdev home_led;
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;
struct joycon_imu_cal accel_cal;
struct joycon_imu_cal gyro_cal;
/* prevents needlessly recalculating these divisors every sample */
s32 imu_cal_accel_divisor[3];
s32 imu_cal_gyro_divisor[3];
/* 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;
/* imu */
struct input_dev *imu_input;
bool imu_first_packet_received; /* helps in initiating timestamp */
unsigned int imu_timestamp_us; /* timestamp we report to userspace */
unsigned int imu_last_pkt_ms; /* used to calc imu report delta */
/* the following are used to track the average imu report time delta */
unsigned int imu_delta_samples_count;
unsigned int imu_delta_samples_sum;
unsigned int imu_avg_delta_ms;
};
/* 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;
}
/* Supply nibbles for flash and on. Ones correspond to active */
static int joycon_set_player_leds(struct joycon_ctlr *ctlr, u8 flash, u8 on)
{
struct joycon_subcmd_request *req;
u8 buffer[sizeof(*req) + 1] = { 0 };
req = (struct joycon_subcmd_request *)buffer;
req->subcmd_id = JC_SUBCMD_SET_PLAYER_LIGHTS;
req->data[0] = (flash << 4) | on;
hid_dbg(ctlr->hdev, "setting player leds\n");
return joycon_send_subcmd(ctlr, req, 1, HZ/4);
}
static int joycon_request_spi_flash_read(struct joycon_ctlr *ctlr,
u32 start_addr, u8 size, u8 **reply)
{
struct joycon_subcmd_request *req;
struct joycon_input_report *report;
u8 buffer[sizeof(*req) + 5] = { 0 };
u8 *data;
int ret;
if (!reply)
return -EINVAL;
req = (struct joycon_subcmd_request *)buffer;
req->subcmd_id = JC_SUBCMD_SPI_FLASH_READ;
data = req->data;
put_unaligned_le32(start_addr, data);
data[4] = size;
hid_dbg(ctlr->hdev, "requesting SPI flash data\n");
ret = joycon_send_subcmd(ctlr, req, 5, HZ);
if (ret) {
hid_err(ctlr->hdev, "failed reading SPI flash; ret=%d\n", ret);
} else {
report = (struct joycon_input_report *)ctlr->input_buf;
/* The read data starts at the 6th byte */
*reply = &report->subcmd_reply.data[5];
}
return ret;
}
/*
* User calibration's presence is denoted with a magic byte preceding it.
* returns 0 if magic val is present, 1 if not present, < 0 on error
*/
static int joycon_check_for_cal_magic(struct joycon_ctlr *ctlr, u32 flash_addr)
{
int ret;
u8 *reply;
ret = joycon_request_spi_flash_read(ctlr, flash_addr,
JC_CAL_USR_MAGIC_SIZE, &reply);
if (ret)
return ret;
return reply[0] != JC_CAL_USR_MAGIC_0 || reply[1] != JC_CAL_USR_MAGIC_1;
}
static int joycon_read_stick_calibration(struct joycon_ctlr *ctlr, u16 cal_addr,
struct joycon_stick_cal *cal_x,
struct joycon_stick_cal *cal_y,
bool left_stick)
{
s32 x_max_above;
s32 x_min_below;
s32 y_max_above;
s32 y_min_below;
u8 *raw_cal;
int ret;
ret = joycon_request_spi_flash_read(ctlr, cal_addr,
JC_CAL_STICK_DATA_SIZE, &raw_cal);
if (ret)
return ret;
/* stick calibration parsing: note the order differs based on stick */
if (left_stick) {
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);
} else {
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;
return 0;
}
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)
{
u16 left_stick_addr = JC_CAL_FCT_DATA_LEFT_ADDR;
u16 right_stick_addr = JC_CAL_FCT_DATA_RIGHT_ADDR;
int ret;
hid_dbg(ctlr->hdev, "requesting cal data\n");
/* check if user stick calibrations are present */
if (!joycon_check_for_cal_magic(ctlr, JC_CAL_USR_LEFT_MAGIC_ADDR)) {
left_stick_addr = JC_CAL_USR_LEFT_DATA_ADDR;
hid_info(ctlr->hdev, "using user cal for left stick\n");
} else {
hid_info(ctlr->hdev, "using factory cal for left stick\n");
}
if (!joycon_check_for_cal_magic(ctlr, JC_CAL_USR_RIGHT_MAGIC_ADDR)) {
right_stick_addr = JC_CAL_USR_RIGHT_DATA_ADDR;
hid_info(ctlr->hdev, "using user cal for right stick\n");
} else {
hid_info(ctlr->hdev, "using factory cal for right stick\n");
}
/* read the left stick calibration data */
ret = joycon_read_stick_calibration(ctlr, left_stick_addr,
&ctlr->left_stick_cal_x,
&ctlr->left_stick_cal_y,
true);
if (ret) {
hid_warn(ctlr->hdev,
"Failed to read left stick cal, using dflts; e=%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;
}
/* read the right stick calibration data */
ret = joycon_read_stick_calibration(ctlr, right_stick_addr,
&ctlr->right_stick_cal_x,
&ctlr->right_stick_cal_y,
false);
if (ret) {
hid_warn(ctlr->hdev,
"Failed to read right stick cal, using dflts; e=%d\n",
ret);
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;
}
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;
}
/*
* These divisors are calculated once rather than for each sample. They are only
* dependent on the IMU calibration values. They are used when processing the
* IMU input reports.
*/
static void joycon_calc_imu_cal_divisors(struct joycon_ctlr *ctlr)
{
int i;
for (i = 0; i < 3; i++) {
ctlr->imu_cal_accel_divisor[i] = ctlr->accel_cal.scale[i] -
ctlr->accel_cal.offset[i];
ctlr->imu_cal_gyro_divisor[i] = ctlr->gyro_cal.scale[i] -
ctlr->gyro_cal.offset[i];
}
}
static const s16 DFLT_ACCEL_OFFSET /*= 0*/;
static const s16 DFLT_ACCEL_SCALE = 16384;
static const s16 DFLT_GYRO_OFFSET /*= 0*/;
static const s16 DFLT_GYRO_SCALE = 13371;
static int joycon_request_imu_calibration(struct joycon_ctlr *ctlr)
{
u16 imu_cal_addr = JC_IMU_CAL_FCT_DATA_ADDR;
u8 *raw_cal;
int ret;
int i;
/* check if user calibration exists */
if (!joycon_check_for_cal_magic(ctlr, JC_IMU_CAL_USR_MAGIC_ADDR)) {
imu_cal_addr = JC_IMU_CAL_USR_DATA_ADDR;
hid_info(ctlr->hdev, "using user cal for IMU\n");
} else {
hid_info(ctlr->hdev, "using factory cal for IMU\n");
}
/* request IMU calibration data */
hid_dbg(ctlr->hdev, "requesting IMU cal data\n");
ret = joycon_request_spi_flash_read(ctlr, imu_cal_addr,
JC_IMU_CAL_DATA_SIZE, &raw_cal);
if (ret) {
hid_warn(ctlr->hdev,
"Failed to read IMU cal, using defaults; ret=%d\n",
ret);
for (i = 0; i < 3; i++) {
ctlr->accel_cal.offset[i] = DFLT_ACCEL_OFFSET;
ctlr->accel_cal.scale[i] = DFLT_ACCEL_SCALE;
ctlr->gyro_cal.offset[i] = DFLT_GYRO_OFFSET;
ctlr->gyro_cal.scale[i] = DFLT_GYRO_SCALE;
}
joycon_calc_imu_cal_divisors(ctlr);
return ret;
}
/* IMU calibration parsing */
for (i = 0; i < 3; i++) {
int j = i * 2;
ctlr->accel_cal.offset[i] = get_unaligned_le16(raw_cal + j);
ctlr->accel_cal.scale[i] = get_unaligned_le16(raw_cal + j + 6);
ctlr->gyro_cal.offset[i] = get_unaligned_le16(raw_cal + j + 12);
ctlr->gyro_cal.scale[i] = get_unaligned_le16(raw_cal + j + 18);
}
joycon_calc_imu_cal_divisors(ctlr);
hid_dbg(ctlr->hdev, "IMU calibration:\n"
"a_o[0]=%d a_o[1]=%d a_o[2]=%d\n"
"a_s[0]=%d a_s[1]=%d a_s[2]=%d\n"
"g_o[0]=%d g_o[1]=%d g_o[2]=%d\n"
"g_s[0]=%d g_s[1]=%d g_s[2]=%d\n",
ctlr->accel_cal.offset[0],
ctlr->accel_cal.offset[1],
ctlr->accel_cal.offset[2],
ctlr->accel_cal.scale[0],
ctlr->accel_cal.scale[1],
ctlr->accel_cal.scale[2],
ctlr->gyro_cal.offset[0],
ctlr->gyro_cal.offset[1],
ctlr->gyro_cal.offset[2],
ctlr->gyro_cal.scale[0],
ctlr->gyro_cal.scale[1],
ctlr->gyro_cal.scale[2]);
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 int joycon_enable_imu(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_IMU;
req->data[0] = 0x01; /* note: 0x00 would disable */
hid_dbg(ctlr->hdev, "enabling IMU\n");
return joycon_send_subcmd(ctlr, req, 1, HZ);
}
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_input_report_parse_imu_data(struct joycon_ctlr *ctlr,
struct joycon_input_report *rep,
struct joycon_imu_data *imu_data)
{
u8 *raw = rep->imu_raw_bytes;
int i;
for (i = 0; i < 3; i++) {
struct joycon_imu_data *data = &imu_data[i];
data->accel_x = get_unaligned_le16(raw + 0);
data->accel_y = get_unaligned_le16(raw + 2);
data->accel_z = get_unaligned_le16(raw + 4);
data->gyro_x = get_unaligned_le16(raw + 6);
data->gyro_y = get_unaligned_le16(raw + 8);
data->gyro_z = get_unaligned_le16(raw + 10);
/* point to next imu sample */
raw += sizeof(struct joycon_imu_data);
}
}
static void joycon_parse_imu_report(struct joycon_ctlr *ctlr,
struct joycon_input_report *rep)
{
struct joycon_imu_data imu_data[3] = {0}; /* 3 reports per packet */
struct input_dev *idev = ctlr->imu_input;
unsigned int msecs = jiffies_to_msecs(jiffies);
unsigned int last_msecs = ctlr->imu_last_pkt_ms;
int i;
int value[6];
joycon_input_report_parse_imu_data(ctlr, rep, imu_data);
/*
* There are complexities surrounding how we determine the timestamps we
* associate with the samples we pass to userspace. The IMU input
* reports do not provide us with a good timestamp. There's a quickly
* incrementing 8-bit counter per input report, but it is not very
* useful for this purpose (it is not entirely clear what rate it
* increments at or if it varies based on packet push rate - more on
* the push rate below...).
*
* The reverse engineering work done on the joy-cons and pro controllers
* by the community seems to indicate the following:
* - The controller samples the IMU every 1.35ms. It then does some of
* its own processing, probably averaging the samples out.
* - Each imu input report contains 3 IMU samples, (usually 5ms apart).
* - In the standard reporting mode (which this driver uses exclusively)
* input reports are pushed from the controller as follows:
* * joy-con (bluetooth): every 15 ms
* * joy-cons (in charging grip via USB): every 15 ms
* * pro controller (USB): every 15 ms
* * pro controller (bluetooth): every 8 ms (this is the wildcard)
*
* Further complicating matters is that some bluetooth stacks are known
* to alter the controller's packet rate by hardcoding the bluetooth
* SSR for the switch controllers (android's stack currently sets the
* SSR to 11ms for both the joy-cons and pro controllers).
*
* In my own testing, I've discovered that my pro controller either
* reports IMU sample batches every 11ms or every 15ms. This rate is
* stable after connecting. It isn't 100% clear what determines this
* rate. Importantly, even when sending every 11ms, none of the samples
* are duplicates. This seems to indicate that the time deltas between
* reported samples can vary based on the input report rate.
*
* The solution employed in this driver is to keep track of the average
* time delta between IMU input reports. In testing, this value has
* proven to be stable, staying at 15ms or 11ms, though other hardware
* configurations and bluetooth stacks could potentially see other rates
* (hopefully this will become more clear as more people use the
* driver).
*
* Keeping track of the average report delta allows us to submit our
* timestamps to userspace based on that. Each report contains 3
* samples, so the IMU sampling rate should be avg_time_delta/3. We can
* also use this average to detect events where we have dropped a
* packet. The userspace timestamp for the samples will be adjusted
* accordingly to prevent unwanted behvaior.
*/
if (!ctlr->imu_first_packet_received) {
ctlr->imu_timestamp_us = 0;
ctlr->imu_delta_samples_count = 0;
ctlr->imu_delta_samples_sum = 0;
ctlr->imu_avg_delta_ms = JC_IMU_DFLT_AVG_DELTA_MS;
ctlr->imu_first_packet_received = true;
} else {
unsigned int delta = msecs - last_msecs;
unsigned int dropped_pkts;
unsigned int dropped_threshold;
/* avg imu report delta housekeeping */
ctlr->imu_delta_samples_sum += delta;
ctlr->imu_delta_samples_count++;
if (ctlr->imu_delta_samples_count >=
JC_IMU_SAMPLES_PER_DELTA_AVG) {
ctlr->imu_avg_delta_ms = ctlr->imu_delta_samples_sum /
ctlr->imu_delta_samples_count;
/* don't ever want divide by zero shenanigans */
if (ctlr->imu_avg_delta_ms == 0) {
ctlr->imu_avg_delta_ms = 1;
hid_warn(ctlr->hdev,
"calculated avg imu delta of 0\n");
}
ctlr->imu_delta_samples_count = 0;
ctlr->imu_delta_samples_sum = 0;
}
/* useful for debugging IMU sample rate */
hid_dbg(ctlr->hdev,
"imu_report: ms=%u last_ms=%u delta=%u avg_delta=%u\n",
msecs, last_msecs, delta, ctlr->imu_avg_delta_ms);
/* check if any packets have been dropped */
dropped_threshold = ctlr->imu_avg_delta_ms * 3 / 2;
dropped_pkts = (delta - min(delta, dropped_threshold)) /
ctlr->imu_avg_delta_ms;
ctlr->imu_timestamp_us += 1000 * ctlr->imu_avg_delta_ms;
if (dropped_pkts > JC_IMU_DROPPED_PKT_WARNING) {
hid_warn(ctlr->hdev,
"compensating for %u dropped IMU reports\n",
dropped_pkts);
hid_warn(ctlr->hdev,
"delta=%u avg_delta=%u\n",
delta, ctlr->imu_avg_delta_ms);
}
}
ctlr->imu_last_pkt_ms = msecs;
/* Each IMU input report contains three samples */
for (i = 0; i < 3; i++) {
input_event(idev, EV_MSC, MSC_TIMESTAMP,
ctlr->imu_timestamp_us);
/*
* These calculations (which use the controller's calibration
* settings to improve the final values) are based on those
* found in the community's reverse-engineering repo (linked at
* top of driver). For hid-nintendo, we make sure that the final
* value given to userspace is always in terms of the axis
* resolution we provided.
*
* Currently only the gyro calculations subtract the calibration
* offsets from the raw value itself. In testing, doing the same
* for the accelerometer raw values decreased accuracy.
*
* Note that the gyro values are multiplied by the
* precision-saving scaling factor to prevent large inaccuracies
* due to truncation of the resolution value which would
* otherwise occur. To prevent overflow (without resorting to 64
* bit integer math), the mult_frac macro is used.
*/
value[0] = mult_frac((JC_IMU_PREC_RANGE_SCALE *
(imu_data[i].gyro_x -
ctlr->gyro_cal.offset[0])),
ctlr->gyro_cal.scale[0],
ctlr->imu_cal_gyro_divisor[0]);
value[1] = mult_frac((JC_IMU_PREC_RANGE_SCALE *
(imu_data[i].gyro_y -
ctlr->gyro_cal.offset[1])),
ctlr->gyro_cal.scale[1],
ctlr->imu_cal_gyro_divisor[1]);
value[2] = mult_frac((JC_IMU_PREC_RANGE_SCALE *
(imu_data[i].gyro_z -
ctlr->gyro_cal.offset[2])),
ctlr->gyro_cal.scale[2],
ctlr->imu_cal_gyro_divisor[2]);
value[3] = ((s32)imu_data[i].accel_x *
ctlr->accel_cal.scale[0]) /
ctlr->imu_cal_accel_divisor[0];
value[4] = ((s32)imu_data[i].accel_y *
ctlr->accel_cal.scale[1]) /
ctlr->imu_cal_accel_divisor[1];
value[5] = ((s32)imu_data[i].accel_z *
ctlr->accel_cal.scale[2]) /
ctlr->imu_cal_accel_divisor[2];
hid_dbg(ctlr->hdev, "raw_gyro: g_x=%d g_y=%d g_z=%d\n",
imu_data[i].gyro_x, imu_data[i].gyro_y,
imu_data[i].gyro_z);
hid_dbg(ctlr->hdev, "raw_accel: a_x=%d a_y=%d a_z=%d\n",
imu_data[i].accel_x, imu_data[i].accel_y,
imu_data[i].accel_z);
/*
* The right joy-con has 2 axes negated, Y and Z. This is due to
* the orientation of the IMU in the controller. We negate those
* axes' values in order to be consistent with the left joy-con
* and the pro controller:
* X: positive is pointing toward the triggers
* Y: positive is pointing to the left
* Z: positive is pointing up (out of the buttons/sticks)
* The axes follow the right-hand rule.
*/
if (jc_type_is_joycon(ctlr) && jc_type_has_right(ctlr)) {
int j;
/* negate all but x axis */
for (j = 1; j < 6; ++j) {
if (j == 3)
continue;
value[j] *= -1;
}
}
input_report_abs(idev, ABS_RX, value[0]);
input_report_abs(idev, ABS_RY, value[1]);
input_report_abs(idev, ABS_RZ, value[2]);
input_report_abs(idev, ABS_X, value[3]);
input_report_abs(idev, ABS_Y, value[4]);
input_report_abs(idev, ABS_Z, value[5]);
input_sync(idev);
/* convert to micros and divide by 3 (3 samples per report). */
ctlr->imu_timestamp_us += ctlr->imu_avg_delta_ms * 1000 / 3;
}
}
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 &&
ctlr->ctlr_state != JOYCON_CTLR_STATE_REMOVED &&
(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);
}
/* parse IMU data if present */
if (rep->id == JC_INPUT_IMU_DATA)
joycon_parse_imu_report(ctlr, rep);
}
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);
/* don't wait for the periodic send (reduces latency) */
if (schedule_now && ctlr->ctlr_state != JOYCON_CTLR_STATE_REMOVED)
queue_work(ctlr->rumble_queue, &ctlr->rumble_worker);
spin_unlock_irqrestore(&ctlr->lock, flags);
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 int joycon_input_create(struct joycon_ctlr *ctlr)
{
struct hid_device *hdev;
const char *name;
const char *imu_name;
int ret;
int i;
hdev = ctlr->hdev;
switch (hdev->product) {
case USB_DEVICE_ID_NINTENDO_PROCON:
name = "Nintendo Switch Pro Controller";
imu_name = "Nintendo Switch Pro Controller IMU";
break;
case USB_DEVICE_ID_NINTENDO_CHRGGRIP:
if (jc_type_has_left(ctlr)) {
name = "Nintendo Switch Left Joy-Con (Grip)";
imu_name = "Nintendo Switch Left Joy-Con IMU (Grip)";
} else {
name = "Nintendo Switch Right Joy-Con (Grip)";
imu_name = "Nintendo Switch Right Joy-Con IMU (Grip)";
}
break;
case USB_DEVICE_ID_NINTENDO_JOYCONL:
name = "Nintendo Switch Left Joy-Con";
imu_name = "Nintendo Switch Left Joy-Con IMU";
break;
case USB_DEVICE_ID_NINTENDO_JOYCONR:
name = "Nintendo Switch Right Joy-Con";
imu_name = "Nintendo Switch Right Joy-Con IMU";
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;
ctlr->input->phys = hdev->phys;
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;
/* configure the imu input device */
ctlr->imu_input = devm_input_allocate_device(&hdev->dev);
if (!ctlr->imu_input)
return -ENOMEM;
ctlr->imu_input->id.bustype = hdev->bus;
ctlr->imu_input->id.vendor = hdev->vendor;
ctlr->imu_input->id.product = hdev->product;
ctlr->imu_input->id.version = hdev->version;
ctlr->imu_input->uniq = ctlr->mac_addr_str;
ctlr->imu_input->name = imu_name;
ctlr->imu_input->phys = hdev->phys;
input_set_drvdata(ctlr->imu_input, ctlr);
/* configure imu axes */
input_set_abs_params(ctlr->imu_input, ABS_X,
-JC_IMU_MAX_ACCEL_MAG, JC_IMU_MAX_ACCEL_MAG,
JC_IMU_ACCEL_FUZZ, JC_IMU_ACCEL_FLAT);
input_set_abs_params(ctlr->imu_input, ABS_Y,
-JC_IMU_MAX_ACCEL_MAG, JC_IMU_MAX_ACCEL_MAG,
JC_IMU_ACCEL_FUZZ, JC_IMU_ACCEL_FLAT);
input_set_abs_params(ctlr->imu_input, ABS_Z,
-JC_IMU_MAX_ACCEL_MAG, JC_IMU_MAX_ACCEL_MAG,
JC_IMU_ACCEL_FUZZ, JC_IMU_ACCEL_FLAT);
input_abs_set_res(ctlr->imu_input, ABS_X, JC_IMU_ACCEL_RES_PER_G);
input_abs_set_res(ctlr->imu_input, ABS_Y, JC_IMU_ACCEL_RES_PER_G);
input_abs_set_res(ctlr->imu_input, ABS_Z, JC_IMU_ACCEL_RES_PER_G);
input_set_abs_params(ctlr->imu_input, ABS_RX,
-JC_IMU_MAX_GYRO_MAG, JC_IMU_MAX_GYRO_MAG,
JC_IMU_GYRO_FUZZ, JC_IMU_GYRO_FLAT);
input_set_abs_params(ctlr->imu_input, ABS_RY,
-JC_IMU_MAX_GYRO_MAG, JC_IMU_MAX_GYRO_MAG,
JC_IMU_GYRO_FUZZ, JC_IMU_GYRO_FLAT);
input_set_abs_params(ctlr->imu_input, ABS_RZ,
-JC_IMU_MAX_GYRO_MAG, JC_IMU_MAX_GYRO_MAG,
JC_IMU_GYRO_FUZZ, JC_IMU_GYRO_FLAT);
input_abs_set_res(ctlr->imu_input, ABS_RX, JC_IMU_GYRO_RES_PER_DPS);
input_abs_set_res(ctlr->imu_input, ABS_RY, JC_IMU_GYRO_RES_PER_DPS);
input_abs_set_res(ctlr->imu_input, ABS_RZ, JC_IMU_GYRO_RES_PER_DPS);
__set_bit(EV_MSC, ctlr->imu_input->evbit);
__set_bit(MSC_TIMESTAMP, ctlr->imu_input->mscbit);
__set_bit(INPUT_PROP_ACCELEROMETER, ctlr->imu_input->propbit);
ret = input_register_device(ctlr->imu_input);
if (ret)
return ret;
return 0;
}
static int joycon_player_led_brightness_set(struct led_classdev *led,
enum led_brightness brightness)
{
struct device *dev = led->dev->parent;
struct hid_device *hdev = to_hid_device(dev);
struct joycon_ctlr *ctlr;
int val = 0;
int i;
int ret;
int num;
ctlr = hid_get_drvdata(hdev);
if (!ctlr) {
hid_err(hdev, "No controller data\n");
return -ENODEV;
}
/* determine which player led this is */
for (num = 0; num < JC_NUM_LEDS; num++) {
if (&ctlr->leds[num] == led)
break;
}
if (num >= JC_NUM_LEDS)
return -EINVAL;
mutex_lock(&ctlr->output_mutex);
for (i = 0; i < JC_NUM_LEDS; i++) {
if (i == num)
val |= brightness << i;
else
val |= ctlr->leds[i].brightness << i;
}
ret = joycon_set_player_leds(ctlr, 0, val);
mutex_unlock(&ctlr->output_mutex);
return ret;
}
static int joycon_home_led_brightness_set(struct led_classdev *led,
enum led_brightness brightness)
{
struct device *dev = led->dev->parent;
struct hid_device *hdev = to_hid_device(dev);
struct joycon_ctlr *ctlr;
struct joycon_subcmd_request *req;
u8 buffer[sizeof(*req) + 5] = { 0 };
u8 *data;
int ret;
ctlr = hid_get_drvdata(hdev);
if (!ctlr) {
hid_err(hdev, "No controller data\n");
return -ENODEV;
}
req = (struct joycon_subcmd_request *)buffer;
req->subcmd_id = JC_SUBCMD_SET_HOME_LIGHT;
data = req->data;
data[0] = 0x01;
data[1] = brightness << 4;
data[2] = brightness | (brightness << 4);
data[3] = 0x11;
data[4] = 0x11;
hid_dbg(hdev, "setting home led brightness\n");
mutex_lock(&ctlr->output_mutex);
ret = joycon_send_subcmd(ctlr, req, 5, HZ/4);
mutex_unlock(&ctlr->output_mutex);
return ret;
}
static DEFINE_MUTEX(joycon_input_num_mutex);
static int joycon_leds_create(struct joycon_ctlr *ctlr)
{
struct hid_device *hdev = ctlr->hdev;
struct device *dev = &hdev->dev;
const char *d_name = dev_name(dev);
struct led_classdev *led;
char *name;
int ret = 0;
int i;
static int input_num = 1;
/* Set the default controller player leds based on controller number */
mutex_lock(&joycon_input_num_mutex);
mutex_lock(&ctlr->output_mutex);
ret = joycon_set_player_leds(ctlr, 0, 0xF >> (4 - input_num));
if (ret)
hid_warn(ctlr->hdev, "Failed to set leds; ret=%d\n", ret);
mutex_unlock(&ctlr->output_mutex);
/* configure the player LEDs */
for (i = 0; i < JC_NUM_LEDS; i++) {
name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s:%s",
d_name,
"green",
joycon_player_led_names[i]);
if (!name) {
mutex_unlock(&joycon_input_num_mutex);
return -ENOMEM;
}
led = &ctlr->leds[i];
led->name = name;
led->brightness = ((i + 1) <= input_num) ? 1 : 0;
led->max_brightness = 1;
led->brightness_set_blocking =
joycon_player_led_brightness_set;
led->flags = LED_CORE_SUSPENDRESUME | LED_HW_PLUGGABLE;
ret = devm_led_classdev_register(&hdev->dev, led);
if (ret) {
hid_err(hdev, "Failed registering %s LED\n", led->name);
mutex_unlock(&joycon_input_num_mutex);
return ret;
}
}
if (++input_num > 4)
input_num = 1;
mutex_unlock(&joycon_input_num_mutex);
/* configure the home LED */
if (jc_type_has_right(ctlr)) {
name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s:%s",
d_name,
"blue",
LED_FUNCTION_PLAYER5);
if (!name)
return -ENOMEM;
led = &ctlr->home_led;
led->name = name;
led->brightness = 0;
led->max_brightness = 0xF;
led->brightness_set_blocking = joycon_home_led_brightness_set;
led->flags = LED_CORE_SUSPENDRESUME | LED_HW_PLUGGABLE;
ret = devm_led_classdev_register(&hdev->dev, led);
if (ret) {
hid_err(hdev, "Failed registering home led\n");
return ret;
}
/* Set the home LED to 0 as default state */
ret = joycon_home_led_brightness_set(led, 0);
if (ret) {
hid_err(hdev, "Failed to set home LED dflt; ret=%d\n",
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->subcmd_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->subcmd_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->subcmd_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");
}
/* get IMU calibration data, and parse it */
ret = joycon_request_imu_calibration(ctlr);
if (ret) {
/*
* We can function with default calibration, but it may be
* inaccurate. Provide a warning, and continue on.
*/
hid_warn(hdev, "Unable to read IMU calibration data\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;
}
/* Enable the IMU */
ret = joycon_enable_imu(ctlr);
if (ret) {
hid_err(hdev, "Failed to enable the IMU; 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 leds */
ret = joycon_leds_create(ctlr);
if (ret) {
hid_err(hdev, "Failed to create leds; ret=%d\n", ret);
goto err_close;
}
/* 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");
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