Quelle  hid-corsair-void.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  HID driver for Corsair Void headsets
 *
 *  Copyright (C) 2023-2024 Stuart Hayhurst
 */

/* -------------------------------------------------------------------------- */
/* Receiver report information: (ID 100)                                      */
/* -------------------------------------------------------------------------- */
/*
 * When queried, the receiver reponds with 5 bytes to describe the battery
 *   The power button, mute button and moving the mic also trigger this report
 * This includes power button + mic + connection + battery status and capacity
 * The information below may not be perfect, it's been gathered through guesses
 *
 * 0: REPORT ID
 *  100 for the battery packet
 *
 * 1: POWER BUTTON + (?)
 *  Largest bit is 1 when power button pressed
 *
 * 2: BATTERY CAPACITY + MIC STATUS
 *  Battery capacity:
 *    Seems to report ~54 higher than reality when charging
 *    Capped at 100, charging or not
 *  Microphone status:
 *    Largest bit is set to 1 when the mic is physically up
 *    No bits change when the mic is muted, only when physically moved
 *    This report is sent every time the mic is moved, no polling required
 *
 * 3: CONNECTION STATUS
 *  16: Wired headset
 *  38: Initialising
 *  49: Lost connection
 *  51: Disconnected, searching
 *  52: Disconnected, not searching
 *  177: Normal
 *
 * 4: BATTERY STATUS
 *  0: Disconnected
 *  1: Normal
 *  2: Low
 *  3: Critical - sent during shutdown
 *  4: Fully charged
 *  5: Charging
 */
/* -------------------------------------------------------------------------- */

/* -------------------------------------------------------------------------- */
/* Receiver report information: (ID 102)                                      */
/* -------------------------------------------------------------------------- */
/*
 * When queried, the recevier responds with 4 bytes to describe the firmware
 * The first 2 bytes are for the receiver, the second 2 are the headset
 * The headset firmware version will be 0 if no headset is connected
 *
 * 0: Recevier firmware major version
 *  Major version of the receiver's firmware
 *
 * 1: Recevier firmware minor version
 *  Minor version of the receiver's firmware
 *
 * 2: Headset firmware major version
 *  Major version of the headset's firmware
 *
 * 3: Headset firmware minor version
 *  Minor version of the headset's firmware
 */
/* -------------------------------------------------------------------------- */

#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/power_supply.h>
#include <linux/usb.h>
#include <linux/workqueue.h>
#include <asm/byteorder.h>

#include "hid-ids.h"

#define CORSAIR_VOID_DEVICE(id, type)  { HID_USB_DEVICE(USB_VENDOR_ID_CORSAIR, (id)), \
      .driver_data = (type) }
#define CORSAIR_VOID_WIRELESS_DEVICE(id) CORSAIR_VOID_DEVICE((id), CORSAIR_VOID_WIRELESS)
#define CORSAIR_VOID_WIRED_DEVICE(id)  CORSAIR_VOID_DEVICE((id), CORSAIR_VOID_WIRED)

#define CORSAIR_VOID_STATUS_REQUEST_ID  0xC9
#define CORSAIR_VOID_NOTIF_REQUEST_ID  0xCA
#define CORSAIR_VOID_SIDETONE_REQUEST_ID 0xFF
#define CORSAIR_VOID_STATUS_REPORT_ID  0x64
#define CORSAIR_VOID_FIRMWARE_REPORT_ID  0x66

#define CORSAIR_VOID_USB_SIDETONE_REQUEST 0x1
#define CORSAIR_VOID_USB_SIDETONE_REQUEST_TYPE 0x21
#define CORSAIR_VOID_USB_SIDETONE_VALUE  0x200
#define CORSAIR_VOID_USB_SIDETONE_INDEX  0xB00

#define CORSAIR_VOID_MIC_MASK   GENMASK(7, 7)
#define CORSAIR_VOID_CAPACITY_MASK  GENMASK(6, 0)

#define CORSAIR_VOID_WIRELESS_CONNECTED  177

#define CORSAIR_VOID_SIDETONE_MAX_WIRELESS 55
#define CORSAIR_VOID_SIDETONE_MAX_WIRED  4096

enum {
 CORSAIR_VOID_WIRELESS,
 CORSAIR_VOID_WIRED,
};

enum {
 CORSAIR_VOID_BATTERY_NORMAL = 1,
 CORSAIR_VOID_BATTERY_LOW = 2,
 CORSAIR_VOID_BATTERY_CRITICAL = 3,
 CORSAIR_VOID_BATTERY_CHARGED = 4,
 CORSAIR_VOID_BATTERY_CHARGING = 5,
};

enum {
 CORSAIR_VOID_ADD_BATTERY = 0,
 CORSAIR_VOID_REMOVE_BATTERY = 1,
 CORSAIR_VOID_UPDATE_BATTERY = 2,
};

static enum power_supply_property corsair_void_battery_props[] = {
 POWER_SUPPLY_PROP_STATUS,
 POWER_SUPPLY_PROP_PRESENT,
 POWER_SUPPLY_PROP_CAPACITY,
 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 POWER_SUPPLY_PROP_SCOPE,
 POWER_SUPPLY_PROP_MODEL_NAME,
 POWER_SUPPLY_PROP_MANUFACTURER,
};

struct corsair_void_battery_data {
 int status;
 bool present;
 int capacity;
 int capacity_level;
};

struct corsair_void_drvdata {
 struct hid_device *hid_dev;
 struct device *dev;

 char *name;
 bool is_wired;
 unsigned int sidetone_max;

 struct corsair_void_battery_data battery_data;
 bool mic_up;
 bool connected;
 int fw_receiver_major;
 int fw_receiver_minor;
 int fw_headset_major;
 int fw_headset_minor;

 struct power_supply *battery;
 struct power_supply_desc battery_desc;

 struct delayed_work delayed_status_work;
 struct delayed_work delayed_firmware_work;

 unsigned long battery_work_flags;
 struct work_struct battery_work;
};

/*
 * Functions to process receiver data
*/

static void corsair_void_set_wireless_status(struct corsair_void_drvdata *drvdata)
{
 struct usb_interface *usb_if = to_usb_interface(drvdata->dev->parent);

 if (drvdata->is_wired)
  return;

 usb_set_wireless_status(usb_if, drvdata->connected ?
     USB_WIRELESS_STATUS_CONNECTED :
     USB_WIRELESS_STATUS_DISCONNECTED);
}

static void corsair_void_set_unknown_batt(struct corsair_void_drvdata *drvdata)
{
 struct corsair_void_battery_data *battery_data = &drvdata->battery_data;

 battery_data->status = POWER_SUPPLY_STATUS_UNKNOWN;
 battery_data->present = false;
 battery_data->capacity = 0;
 battery_data->capacity_level = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
}

/* Reset data that may change between wireless connections */
static void corsair_void_set_unknown_wireless_data(struct corsair_void_drvdata *drvdata)
{
 /* Only 0 out headset, receiver is always known if relevant */
 drvdata->fw_headset_major = 0;
 drvdata->fw_headset_minor = 0;

 drvdata->connected = false;
 drvdata->mic_up = false;

 corsair_void_set_wireless_status(drvdata);
}

static void corsair_void_process_receiver(struct corsair_void_drvdata *drvdata,
       int raw_battery_capacity,
       int raw_connection_status,
       int raw_battery_status)
{
 struct corsair_void_battery_data *battery_data = &drvdata->battery_data;
 struct corsair_void_battery_data orig_battery_data;

 /* Save initial battery data, to compare later */
 orig_battery_data = *battery_data;

 /* Headset not connected, or it's wired */
 if (raw_connection_status != CORSAIR_VOID_WIRELESS_CONNECTED)
  goto unknown_battery;

 /* Battery information unavailable */
 if (raw_battery_status == 0)
  goto unknown_battery;

 /* Battery must be connected then */
 battery_data->present = true;
 battery_data->capacity_level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;

 /* Set battery status */
 switch (raw_battery_status) {
 case CORSAIR_VOID_BATTERY_NORMAL:
 case CORSAIR_VOID_BATTERY_LOW:
 case CORSAIR_VOID_BATTERY_CRITICAL:
  battery_data->status = POWER_SUPPLY_STATUS_DISCHARGING;
  if (raw_battery_status == CORSAIR_VOID_BATTERY_LOW)
   battery_data->capacity_level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
  else if (raw_battery_status == CORSAIR_VOID_BATTERY_CRITICAL)
   battery_data->capacity_level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;

  break;
 case CORSAIR_VOID_BATTERY_CHARGED:
  battery_data->status = POWER_SUPPLY_STATUS_FULL;
  break;
 case CORSAIR_VOID_BATTERY_CHARGING:
  battery_data->status = POWER_SUPPLY_STATUS_CHARGING;
  break;
 default:
  hid_warn(drvdata->hid_dev, "unknown battery status '%d'",
    raw_battery_status);
  goto unknown_battery;
  break;
 }

 battery_data->capacity = raw_battery_capacity;
 corsair_void_set_wireless_status(drvdata);

 goto success;
unknown_battery:
 corsair_void_set_unknown_batt(drvdata);
success:

 /* Inform power supply if battery values changed */
 if (memcmp(&orig_battery_data, battery_data, sizeof(*battery_data))) {
  set_bit(CORSAIR_VOID_UPDATE_BATTERY,
   &drvdata->battery_work_flags);
  schedule_work(&drvdata->battery_work);
 }
}

/*
 * Functions to report stored data
*/

static int corsair_void_battery_get_property(struct power_supply *psy,
          enum power_supply_property prop,
          union power_supply_propval *val)
{
 struct corsair_void_drvdata *drvdata = power_supply_get_drvdata(psy);

 switch (prop) {
  case POWER_SUPPLY_PROP_SCOPE:
   val->intval = POWER_SUPPLY_SCOPE_DEVICE;
   break;
  case POWER_SUPPLY_PROP_MODEL_NAME:
   if (!strncmp(drvdata->hid_dev->name, "Corsair ", 8))
    val->strval = drvdata->hid_dev->name + 8;
   else
    val->strval = drvdata->hid_dev->name;
   break;
  case POWER_SUPPLY_PROP_MANUFACTURER:
   val->strval = "Corsair";
   break;
  case POWER_SUPPLY_PROP_STATUS:
   val->intval = drvdata->battery_data.status;
   break;
  case POWER_SUPPLY_PROP_PRESENT:
   val->intval = drvdata->battery_data.present;
   break;
  case POWER_SUPPLY_PROP_CAPACITY:
   val->intval = drvdata->battery_data.capacity;
   break;
  case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
   val->intval = drvdata->battery_data.capacity_level;
   break;
  default:
   return -EINVAL;
 }

 return 0;
}

static ssize_t microphone_up_show(struct device *dev,
      struct device_attribute *attr, char *buf)
{
 struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);

 if (!drvdata->connected)
  return -ENODEV;

 return sysfs_emit(buf, "%d\n", drvdata->mic_up);
}

static ssize_t fw_version_receiver_show(struct device *dev,
     struct device_attribute *attr,
     char *buf)
{
 struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);

 if (drvdata->fw_receiver_major == 0 && drvdata->fw_receiver_minor == 0)
  return -ENODATA;

 return sysfs_emit(buf, "%d.%02d\n", drvdata->fw_receiver_major,
     drvdata->fw_receiver_minor);
}


static ssize_t fw_version_headset_show(struct device *dev,
           struct device_attribute *attr,
           char *buf)
{
 struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);

 if (drvdata->fw_headset_major == 0 && drvdata->fw_headset_minor == 0)
  return -ENODATA;

 return sysfs_emit(buf, "%d.%02d\n", drvdata->fw_headset_major,
     drvdata->fw_headset_minor);
}

static ssize_t sidetone_max_show(struct device *dev,
     struct device_attribute *attr,
     char *buf)
{
 struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);

 return sysfs_emit(buf, "%d\n", drvdata->sidetone_max);
}

/*
 * Functions to send data to headset
*/

static ssize_t send_alert_store(struct device *dev,
    struct device_attribute *attr,
    const char *buf, size_t count)
{
 struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);
 struct hid_device *hid_dev = drvdata->hid_dev;
 unsigned char alert_id;
 unsigned char *send_buf __free(kfree) = NULL;
 int ret;

 if (!drvdata->connected || drvdata->is_wired)
  return -ENODEV;

 /* Only accept 0 or 1 for alert ID */
 if (kstrtou8(buf, 10, &alert_id) || alert_id >= 2)
  return -EINVAL;

 send_buf = kmalloc(3, GFP_KERNEL);
 if (!send_buf)
  return -ENOMEM;

 /* Packet format to send alert with ID alert_id */
 send_buf[0] = CORSAIR_VOID_NOTIF_REQUEST_ID;
 send_buf[1] = 0x02;
 send_buf[2] = alert_id;

 ret = hid_hw_raw_request(hid_dev, CORSAIR_VOID_NOTIF_REQUEST_ID,
     send_buf, 3, HID_OUTPUT_REPORT,
     HID_REQ_SET_REPORT);
 if (ret < 0)
  hid_warn(hid_dev, "failed to send alert request (reason: %d)",
    ret);
 else
  ret = count;

 return ret;
}

static int corsair_void_set_sidetone_wired(struct device *dev, const char *buf,
        unsigned int sidetone)
{
 struct usb_interface *usb_if = to_usb_interface(dev->parent);
 struct usb_device *usb_dev = interface_to_usbdev(usb_if);

 /* Packet format to set sidetone for wired headsets */
 __le16 sidetone_le = cpu_to_le16(sidetone);

 return usb_control_msg_send(usb_dev, 0,
       CORSAIR_VOID_USB_SIDETONE_REQUEST,
       CORSAIR_VOID_USB_SIDETONE_REQUEST_TYPE,
       CORSAIR_VOID_USB_SIDETONE_VALUE,
       CORSAIR_VOID_USB_SIDETONE_INDEX,
       &sidetone_le, 2, USB_CTRL_SET_TIMEOUT,
       GFP_KERNEL);
}

static int corsair_void_set_sidetone_wireless(struct device *dev,
           const char *buf,
           unsigned char sidetone)
{
 struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);
 struct hid_device *hid_dev = drvdata->hid_dev;
 unsigned char *send_buf __free(kfree) = NULL;

 send_buf = kmalloc(12, GFP_KERNEL);
 if (!send_buf)
  return -ENOMEM;

 /* Packet format to set sidetone for wireless headsets */
 send_buf[0] = CORSAIR_VOID_SIDETONE_REQUEST_ID;
 send_buf[1] = 0x0B;
 send_buf[2] = 0x00;
 send_buf[3] = 0xFF;
 send_buf[4] = 0x04;
 send_buf[5] = 0x0E;
 send_buf[6] = 0xFF;
 send_buf[7] = 0x05;
 send_buf[8] = 0x01;
 send_buf[9] = 0x04;
 send_buf[10] = 0x00;
 send_buf[11] = sidetone + 200;

 return hid_hw_raw_request(hid_dev, CORSAIR_VOID_SIDETONE_REQUEST_ID,
      send_buf, 12, HID_FEATURE_REPORT,
      HID_REQ_SET_REPORT);
}

static ssize_t set_sidetone_store(struct device *dev,
      struct device_attribute *attr,
      const char *buf, size_t count)
{
 struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);
 struct hid_device *hid_dev = drvdata->hid_dev;
 unsigned int sidetone;
 int ret;

 if (!drvdata->connected)
  return -ENODEV;

 /* sidetone must be between 0 and drvdata->sidetone_max inclusive */
 if (kstrtouint(buf, 10, &sidetone) || sidetone > drvdata->sidetone_max)
  return -EINVAL;

 if (drvdata->is_wired)
  ret = corsair_void_set_sidetone_wired(dev, buf, sidetone);
 else
  ret = corsair_void_set_sidetone_wireless(dev, buf, sidetone);

 if (ret < 0)
  hid_warn(hid_dev, "failed to send sidetone (reason: %d)", ret);
 else
  ret = count;

 return ret;
}

static int corsair_void_request_status(struct hid_device *hid_dev, int id)
{
 unsigned char *send_buf __free(kfree) = NULL;

 send_buf = kmalloc(2, GFP_KERNEL);
 if (!send_buf)
  return -ENOMEM;

 /* Packet format to request data item (status / firmware) refresh */
 send_buf[0] = CORSAIR_VOID_STATUS_REQUEST_ID;
 send_buf[1] = id;

 /* Send request for data refresh */
 return hid_hw_raw_request(hid_dev, CORSAIR_VOID_STATUS_REQUEST_ID,
      send_buf, 2, HID_OUTPUT_REPORT,
      HID_REQ_SET_REPORT);
}

/*
 * Headset connect / disconnect handlers and work handlers
*/

static void corsair_void_status_work_handler(struct work_struct *work)
{
 struct corsair_void_drvdata *drvdata;
 struct delayed_work *delayed_work;
 int battery_ret;

 delayed_work = to_delayed_work(work);
 drvdata = container_of(delayed_work, struct corsair_void_drvdata,
          delayed_status_work);

 battery_ret = corsair_void_request_status(drvdata->hid_dev,
        CORSAIR_VOID_STATUS_REPORT_ID);
 if (battery_ret < 0) {
  hid_warn(drvdata->hid_dev,
    "failed to request battery (reason: %d)", battery_ret);
 }
}

static void corsair_void_firmware_work_handler(struct work_struct *work)
{
 struct corsair_void_drvdata *drvdata;
 struct delayed_work *delayed_work;
 int firmware_ret;

 delayed_work = to_delayed_work(work);
 drvdata = container_of(delayed_work, struct corsair_void_drvdata,
          delayed_firmware_work);

 firmware_ret = corsair_void_request_status(drvdata->hid_dev,
         CORSAIR_VOID_FIRMWARE_REPORT_ID);
 if (firmware_ret < 0) {
  hid_warn(drvdata->hid_dev,
    "failed to request firmware (reason: %d)", firmware_ret);
 }

}

static void corsair_void_add_battery(struct corsair_void_drvdata *drvdata)
{
 struct power_supply_config psy_cfg = {};
 struct power_supply *new_supply;

 if (drvdata->battery)
  return;

 psy_cfg.drv_data = drvdata;
 new_supply = power_supply_register(drvdata->dev,
        &drvdata->battery_desc,
        &psy_cfg);

 if (IS_ERR(new_supply)) {
  hid_err(drvdata->hid_dev,
   "failed to register battery '%s' (reason: %ld)\n",
   drvdata->battery_desc.name,
   PTR_ERR(new_supply));
  return;
 }

 if (power_supply_powers(new_supply, drvdata->dev)) {
  power_supply_unregister(new_supply);
  return;
 }

 drvdata->battery = new_supply;
}

static void corsair_void_battery_work_handler(struct work_struct *work)
{
 struct corsair_void_drvdata *drvdata = container_of(work,
  struct corsair_void_drvdata, battery_work);

 bool add_battery = test_and_clear_bit(CORSAIR_VOID_ADD_BATTERY,
           &drvdata->battery_work_flags);
 bool remove_battery = test_and_clear_bit(CORSAIR_VOID_REMOVE_BATTERY,
       &drvdata->battery_work_flags);
 bool update_battery = test_and_clear_bit(CORSAIR_VOID_UPDATE_BATTERY,
       &drvdata->battery_work_flags);

 if (add_battery && !remove_battery) {
  corsair_void_add_battery(drvdata);
 } else if (remove_battery && !add_battery && drvdata->battery) {
  power_supply_unregister(drvdata->battery);
  drvdata->battery = NULL;
 }

 if (update_battery && drvdata->battery)
  power_supply_changed(drvdata->battery);

}

static void corsair_void_headset_connected(struct corsair_void_drvdata *drvdata)
{
 set_bit(CORSAIR_VOID_ADD_BATTERY, &drvdata->battery_work_flags);
 schedule_work(&drvdata->battery_work);
 schedule_delayed_work(&drvdata->delayed_firmware_work,
         msecs_to_jiffies(100));
}

static void corsair_void_headset_disconnected(struct corsair_void_drvdata *drvdata)
{
 set_bit(CORSAIR_VOID_REMOVE_BATTERY, &drvdata->battery_work_flags);
 schedule_work(&drvdata->battery_work);

 corsair_void_set_unknown_wireless_data(drvdata);
 corsair_void_set_unknown_batt(drvdata);
}

/*
 * Driver setup, probing and HID event handling
*/

static DEVICE_ATTR_RO(fw_version_receiver);
static DEVICE_ATTR_RO(fw_version_headset);
static DEVICE_ATTR_RO(microphone_up);
static DEVICE_ATTR_RO(sidetone_max);

static DEVICE_ATTR_WO(send_alert);
static DEVICE_ATTR_WO(set_sidetone);

static struct attribute *corsair_void_attrs[] = {
 &dev_attr_fw_version_receiver.attr,
 &dev_attr_fw_version_headset.attr,
 &dev_attr_microphone_up.attr,
 &dev_attr_send_alert.attr,
 &dev_attr_set_sidetone.attr,
 &dev_attr_sidetone_max.attr,
 NULL,
};

static const struct attribute_group corsair_void_attr_group = {
 .attrs = corsair_void_attrs,
};

static int corsair_void_probe(struct hid_device *hid_dev,
         const struct hid_device_id *hid_id)
{
 int ret;
 struct corsair_void_drvdata *drvdata;
 char *name;

 if (!hid_is_usb(hid_dev))
  return -EINVAL;

 drvdata = devm_kzalloc(&hid_dev->dev, sizeof(*drvdata),
          GFP_KERNEL);
 if (!drvdata)
  return -ENOMEM;

 hid_set_drvdata(hid_dev, drvdata);
 dev_set_drvdata(&hid_dev->dev, drvdata);

 drvdata->dev = &hid_dev->dev;
 drvdata->hid_dev = hid_dev;
 drvdata->is_wired = hid_id->driver_data == CORSAIR_VOID_WIRED;

 drvdata->sidetone_max = CORSAIR_VOID_SIDETONE_MAX_WIRELESS;
 if (drvdata->is_wired)
  drvdata->sidetone_max = CORSAIR_VOID_SIDETONE_MAX_WIRED;

 /* Set initial values for no wireless headset attached */
 /* If a headset is attached, it'll be prompted later */
 corsair_void_set_unknown_wireless_data(drvdata);
 corsair_void_set_unknown_batt(drvdata);

 /* Receiver version won't be reset after init */
 /* Headset version already set via set_unknown_wireless_data */
 drvdata->fw_receiver_major = 0;
 drvdata->fw_receiver_minor = 0;

 ret = hid_parse(hid_dev);
 if (ret) {
  hid_err(hid_dev, "parse failed (reason: %d)\n", ret);
  return ret;
 }

 name = devm_kasprintf(drvdata->dev, GFP_KERNEL,
         "corsair-void-%d-battery", hid_dev->id);
 if (!name)
  return -ENOMEM;

 drvdata->battery_desc.name = name;
 drvdata->battery_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 drvdata->battery_desc.properties = corsair_void_battery_props;
 drvdata->battery_desc.num_properties = ARRAY_SIZE(corsair_void_battery_props);
 drvdata->battery_desc.get_property = corsair_void_battery_get_property;

 drvdata->battery = NULL;
 INIT_WORK(&drvdata->battery_work, corsair_void_battery_work_handler);

 ret = sysfs_create_group(&hid_dev->dev.kobj, &corsair_void_attr_group);
 if (ret)
  return ret;

 /* Any failures after here will need to call hid_hw_stop */
 ret = hid_hw_start(hid_dev, HID_CONNECT_DEFAULT);
 if (ret) {
  hid_err(hid_dev, "hid_hw_start failed (reason: %d)\n", ret);
  goto failed_after_sysfs;
 }

 /* Refresh battery data, in case wireless headset is already connected */
 INIT_DELAYED_WORK(&drvdata->delayed_status_work,
     corsair_void_status_work_handler);
 schedule_delayed_work(&drvdata->delayed_status_work,
         msecs_to_jiffies(100));

 /* Refresh firmware versions */
 INIT_DELAYED_WORK(&drvdata->delayed_firmware_work,
     corsair_void_firmware_work_handler);
 schedule_delayed_work(&drvdata->delayed_firmware_work,
         msecs_to_jiffies(100));

 return 0;

failed_after_sysfs:
 sysfs_remove_group(&hid_dev->dev.kobj, &corsair_void_attr_group);
 return ret;
}

static void corsair_void_remove(struct hid_device *hid_dev)
{
 struct corsair_void_drvdata *drvdata = hid_get_drvdata(hid_dev);

 hid_hw_stop(hid_dev);
 cancel_work_sync(&drvdata->battery_work);
 if (drvdata->battery)
  power_supply_unregister(drvdata->battery);

 cancel_delayed_work_sync(&drvdata->delayed_status_work);
 cancel_delayed_work_sync(&drvdata->delayed_firmware_work);
 sysfs_remove_group(&hid_dev->dev.kobj, &corsair_void_attr_group);
}

static int corsair_void_raw_event(struct hid_device *hid_dev,
      struct hid_report *hid_report,
      u8 *data, int size)
{
 struct corsair_void_drvdata *drvdata = hid_get_drvdata(hid_dev);
 bool was_connected = drvdata->connected;

 /* Description of packets are documented at the top of this file */
 if (hid_report->id == CORSAIR_VOID_STATUS_REPORT_ID) {
  drvdata->mic_up = FIELD_GET(CORSAIR_VOID_MIC_MASK, data[2]);
  drvdata->connected = (data[3] == CORSAIR_VOID_WIRELESS_CONNECTED) ||
         drvdata->is_wired;

  corsair_void_process_receiver(drvdata,
           FIELD_GET(CORSAIR_VOID_CAPACITY_MASK, data[2]),
           data[3], data[4]);
 } else if (hid_report->id == CORSAIR_VOID_FIRMWARE_REPORT_ID) {
  drvdata->fw_receiver_major = data[1];
  drvdata->fw_receiver_minor = data[2];
  drvdata->fw_headset_major = data[3];
  drvdata->fw_headset_minor = data[4];
 }

 /* Handle wireless headset connect / disconnect */
 if ((was_connected != drvdata->connected) && !drvdata->is_wired) {
  if (drvdata->connected)
   corsair_void_headset_connected(drvdata);
  else
   corsair_void_headset_disconnected(drvdata);
 }

 return 0;
}

static const struct hid_device_id corsair_void_devices[] = {
 /* Corsair Void Wireless */
 CORSAIR_VOID_WIRELESS_DEVICE(0x0a0c),
 CORSAIR_VOID_WIRELESS_DEVICE(0x0a2b),
 CORSAIR_VOID_WIRELESS_DEVICE(0x1b23),
 CORSAIR_VOID_WIRELESS_DEVICE(0x1b25),
 CORSAIR_VOID_WIRELESS_DEVICE(0x1b27),

 /* Corsair Void USB */
 CORSAIR_VOID_WIRED_DEVICE(0x0a0f),
 CORSAIR_VOID_WIRED_DEVICE(0x1b1c),
 CORSAIR_VOID_WIRED_DEVICE(0x1b29),
 CORSAIR_VOID_WIRED_DEVICE(0x1b2a),

 /* Corsair Void Surround */
 CORSAIR_VOID_WIRED_DEVICE(0x0a30),
 CORSAIR_VOID_WIRED_DEVICE(0x0a31),

 /* Corsair Void Pro Wireless */
 CORSAIR_VOID_WIRELESS_DEVICE(0x0a14),
 CORSAIR_VOID_WIRELESS_DEVICE(0x0a16),
 CORSAIR_VOID_WIRELESS_DEVICE(0x0a1a),

 /* Corsair Void Pro USB */
 CORSAIR_VOID_WIRED_DEVICE(0x0a17),
 CORSAIR_VOID_WIRED_DEVICE(0x0a1d),

 /* Corsair Void Pro Surround */
 CORSAIR_VOID_WIRED_DEVICE(0x0a18),
 CORSAIR_VOID_WIRED_DEVICE(0x0a1e),
 CORSAIR_VOID_WIRED_DEVICE(0x0a1f),

 /* Corsair Void Elite Wireless */
 CORSAIR_VOID_WIRELESS_DEVICE(0x0a51),
 CORSAIR_VOID_WIRELESS_DEVICE(0x0a55),
 CORSAIR_VOID_WIRELESS_DEVICE(0x0a75),

 /* Corsair Void Elite USB */
 CORSAIR_VOID_WIRED_DEVICE(0x0a52),
 CORSAIR_VOID_WIRED_DEVICE(0x0a56),

 /* Corsair Void Elite Surround */
 CORSAIR_VOID_WIRED_DEVICE(0x0a53),
 CORSAIR_VOID_WIRED_DEVICE(0x0a57),

 {}
};

MODULE_DEVICE_TABLE(hid, corsair_void_devices);

static struct hid_driver corsair_void_driver = {
 .name = "hid-corsair-void",
 .id_table = corsair_void_devices,
 .probe = corsair_void_probe,
 .remove = corsair_void_remove,
 .raw_event = corsair_void_raw_event,
};

module_hid_driver(corsair_void_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Stuart Hayhurst ");
MODULE_DESCRIPTION("HID driver for Corsair Void headsets");