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linuxdebug/drivers/hid/hid-steam.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0+
/*
* HID driver for Valve Steam Controller
*
* Copyright (c) 2018 Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
*
* Supports both the wired and wireless interfaces.
*
* This controller has a builtin emulation of mouse and keyboard: the right pad
* can be used as a mouse, the shoulder buttons are mouse buttons, A and B
* buttons are ENTER and ESCAPE, and so on. This is implemented as additional
* HID interfaces.
*
* This is known as the "lizard mode", because apparently lizards like to use
* the computer from the coach, without a proper mouse and keyboard.
*
* This driver will disable the lizard mode when the input device is opened
* and re-enable it when the input device is closed, so as not to break user
* mode behaviour. The lizard_mode parameter can be used to change that.
*
* There are a few user space applications (notably Steam Client) that use
* the hidraw interface directly to create input devices (XTest, uinput...).
* In order to avoid breaking them this driver creates a layered hidraw device,
* so it can detect when the client is running and then:
* - it will not send any command to the controller.
* - this input device will be removed, to avoid double input of the same
* user action.
* When the client is closed, this input device will be created again.
*
* For additional functions, such as changing the right-pad margin or switching
* the led, you can use the user-space tool at:
*
* https://github.com/rodrigorc/steamctrl
*/
#include <linux/device.h>
#include <linux/input.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/rcupdate.h>
#include <linux/delay.h>
#include <linux/power_supply.h>
#include "hid-ids.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>");
static bool lizard_mode = true;
static DEFINE_MUTEX(steam_devices_lock);
static LIST_HEAD(steam_devices);
#define STEAM_QUIRK_WIRELESS BIT(0)
/* Touch pads are 40 mm in diameter and 65535 units */
#define STEAM_PAD_RESOLUTION 1638
/* Trigger runs are about 5 mm and 256 units */
#define STEAM_TRIGGER_RESOLUTION 51
/* Joystick runs are about 5 mm and 256 units */
#define STEAM_JOYSTICK_RESOLUTION 51
#define STEAM_PAD_FUZZ 256
/*
* Commands that can be sent in a feature report.
* Thanks to Valve for some valuable hints.
*/
#define STEAM_CMD_SET_MAPPINGS 0x80
#define STEAM_CMD_CLEAR_MAPPINGS 0x81
#define STEAM_CMD_GET_MAPPINGS 0x82
#define STEAM_CMD_GET_ATTRIB 0x83
#define STEAM_CMD_GET_ATTRIB_LABEL 0x84
#define STEAM_CMD_DEFAULT_MAPPINGS 0x85
#define STEAM_CMD_FACTORY_RESET 0x86
#define STEAM_CMD_WRITE_REGISTER 0x87
#define STEAM_CMD_CLEAR_REGISTER 0x88
#define STEAM_CMD_READ_REGISTER 0x89
#define STEAM_CMD_GET_REGISTER_LABEL 0x8a
#define STEAM_CMD_GET_REGISTER_MAX 0x8b
#define STEAM_CMD_GET_REGISTER_DEFAULT 0x8c
#define STEAM_CMD_SET_MODE 0x8d
#define STEAM_CMD_DEFAULT_MOUSE 0x8e
#define STEAM_CMD_FORCEFEEDBAK 0x8f
#define STEAM_CMD_REQUEST_COMM_STATUS 0xb4
#define STEAM_CMD_GET_SERIAL 0xae
/* Some useful register ids */
#define STEAM_REG_LPAD_MODE 0x07
#define STEAM_REG_RPAD_MODE 0x08
#define STEAM_REG_RPAD_MARGIN 0x18
#define STEAM_REG_LED 0x2d
#define STEAM_REG_GYRO_MODE 0x30
/* Raw event identifiers */
#define STEAM_EV_INPUT_DATA 0x01
#define STEAM_EV_CONNECT 0x03
#define STEAM_EV_BATTERY 0x04
/* Values for GYRO_MODE (bitmask) */
#define STEAM_GYRO_MODE_OFF 0x0000
#define STEAM_GYRO_MODE_STEERING 0x0001
#define STEAM_GYRO_MODE_TILT 0x0002
#define STEAM_GYRO_MODE_SEND_ORIENTATION 0x0004
#define STEAM_GYRO_MODE_SEND_RAW_ACCEL 0x0008
#define STEAM_GYRO_MODE_SEND_RAW_GYRO 0x0010
/* Other random constants */
#define STEAM_SERIAL_LEN 10
struct steam_device {
struct list_head list;
spinlock_t lock;
struct hid_device *hdev, *client_hdev;
struct mutex mutex;
bool client_opened;
struct input_dev __rcu *input;
unsigned long quirks;
struct work_struct work_connect;
bool connected;
char serial_no[STEAM_SERIAL_LEN + 1];
struct power_supply_desc battery_desc;
struct power_supply __rcu *battery;
u8 battery_charge;
u16 voltage;
};
static int steam_recv_report(struct steam_device *steam,
u8 *data, int size)
{
struct hid_report *r;
u8 *buf;
int ret;
r = steam->hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[0];
if (!r) {
hid_err(steam->hdev, "No HID_FEATURE_REPORT submitted - nothing to read\n");
return -EINVAL;
}
if (hid_report_len(r) < 64)
return -EINVAL;
buf = hid_alloc_report_buf(r, GFP_KERNEL);
if (!buf)
return -ENOMEM;
/*
* The report ID is always 0, so strip the first byte from the output.
* hid_report_len() is not counting the report ID, so +1 to the length
* or else we get a EOVERFLOW. We are safe from a buffer overflow
* because hid_alloc_report_buf() allocates +7 bytes.
*/
ret = hid_hw_raw_request(steam->hdev, 0x00,
buf, hid_report_len(r) + 1,
HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
if (ret > 0)
memcpy(data, buf + 1, min(size, ret - 1));
kfree(buf);
return ret;
}
static int steam_send_report(struct steam_device *steam,
u8 *cmd, int size)
{
struct hid_report *r;
u8 *buf;
unsigned int retries = 50;
int ret;
r = steam->hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[0];
if (!r) {
hid_err(steam->hdev, "No HID_FEATURE_REPORT submitted - nothing to read\n");
return -EINVAL;
}
if (hid_report_len(r) < 64)
return -EINVAL;
buf = hid_alloc_report_buf(r, GFP_KERNEL);
if (!buf)
return -ENOMEM;
/* The report ID is always 0 */
memcpy(buf + 1, cmd, size);
/*
* Sometimes the wireless controller fails with EPIPE
* when sending a feature report.
* Doing a HID_REQ_GET_REPORT and waiting for a while
* seems to fix that.
*/
do {
ret = hid_hw_raw_request(steam->hdev, 0,
buf, size + 1,
HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
if (ret != -EPIPE)
break;
msleep(20);
} while (--retries);
kfree(buf);
if (ret < 0)
hid_err(steam->hdev, "%s: error %d (%*ph)\n", __func__,
ret, size, cmd);
return ret;
}
static inline int steam_send_report_byte(struct steam_device *steam, u8 cmd)
{
return steam_send_report(steam, &cmd, 1);
}
static int steam_write_registers(struct steam_device *steam,
/* u8 reg, u16 val */...)
{
/* Send: 0x87 len (reg valLo valHi)* */
u8 reg;
u16 val;
u8 cmd[64] = {STEAM_CMD_WRITE_REGISTER, 0x00};
va_list args;
va_start(args, steam);
for (;;) {
reg = va_arg(args, int);
if (reg == 0)
break;
val = va_arg(args, int);
cmd[cmd[1] + 2] = reg;
cmd[cmd[1] + 3] = val & 0xff;
cmd[cmd[1] + 4] = val >> 8;
cmd[1] += 3;
}
va_end(args);
return steam_send_report(steam, cmd, 2 + cmd[1]);
}
static int steam_get_serial(struct steam_device *steam)
{
/*
* Send: 0xae 0x15 0x01
* Recv: 0xae 0x15 0x01 serialnumber (10 chars)
*/
int ret;
u8 cmd[] = {STEAM_CMD_GET_SERIAL, 0x15, 0x01};
u8 reply[3 + STEAM_SERIAL_LEN + 1];
ret = steam_send_report(steam, cmd, sizeof(cmd));
if (ret < 0)
return ret;
ret = steam_recv_report(steam, reply, sizeof(reply));
if (ret < 0)
return ret;
if (reply[0] != 0xae || reply[1] != 0x15 || reply[2] != 0x01)
return -EIO;
reply[3 + STEAM_SERIAL_LEN] = 0;
strscpy(steam->serial_no, reply + 3, sizeof(steam->serial_no));
return 0;
}
/*
* This command requests the wireless adaptor to post an event
* with the connection status. Useful if this driver is loaded when
* the controller is already connected.
*/
static inline int steam_request_conn_status(struct steam_device *steam)
{
return steam_send_report_byte(steam, STEAM_CMD_REQUEST_COMM_STATUS);
}
static void steam_set_lizard_mode(struct steam_device *steam, bool enable)
{
if (enable) {
/* enable esc, enter, cursors */
steam_send_report_byte(steam, STEAM_CMD_DEFAULT_MAPPINGS);
/* enable mouse */
steam_send_report_byte(steam, STEAM_CMD_DEFAULT_MOUSE);
steam_write_registers(steam,
STEAM_REG_RPAD_MARGIN, 0x01, /* enable margin */
0);
} else {
/* disable esc, enter, cursor */
steam_send_report_byte(steam, STEAM_CMD_CLEAR_MAPPINGS);
steam_write_registers(steam,
STEAM_REG_RPAD_MODE, 0x07, /* disable mouse */
STEAM_REG_RPAD_MARGIN, 0x00, /* disable margin */
0);
}
}
static int steam_input_open(struct input_dev *dev)
{
struct steam_device *steam = input_get_drvdata(dev);
mutex_lock(&steam->mutex);
if (!steam->client_opened && lizard_mode)
steam_set_lizard_mode(steam, false);
mutex_unlock(&steam->mutex);
return 0;
}
static void steam_input_close(struct input_dev *dev)
{
struct steam_device *steam = input_get_drvdata(dev);
mutex_lock(&steam->mutex);
if (!steam->client_opened && lizard_mode)
steam_set_lizard_mode(steam, true);
mutex_unlock(&steam->mutex);
}
static enum power_supply_property steam_battery_props[] = {
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_SCOPE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CAPACITY,
};
static int steam_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct steam_device *steam = power_supply_get_drvdata(psy);
unsigned long flags;
s16 volts;
u8 batt;
int ret = 0;
spin_lock_irqsave(&steam->lock, flags);
volts = steam->voltage;
batt = steam->battery_charge;
spin_unlock_irqrestore(&steam->lock, flags);
switch (psp) {
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_VOLTAGE_NOW:
val->intval = volts * 1000; /* mV -> uV */
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = batt;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int steam_battery_register(struct steam_device *steam)
{
struct power_supply *battery;
struct power_supply_config battery_cfg = { .drv_data = steam, };
unsigned long flags;
int ret;
steam->battery_desc.type = POWER_SUPPLY_TYPE_BATTERY;
steam->battery_desc.properties = steam_battery_props;
steam->battery_desc.num_properties = ARRAY_SIZE(steam_battery_props);
steam->battery_desc.get_property = steam_battery_get_property;
steam->battery_desc.name = devm_kasprintf(&steam->hdev->dev,
GFP_KERNEL, "steam-controller-%s-battery",
steam->serial_no);
if (!steam->battery_desc.name)
return -ENOMEM;
/* avoid the warning of 0% battery while waiting for the first info */
spin_lock_irqsave(&steam->lock, flags);
steam->voltage = 3000;
steam->battery_charge = 100;
spin_unlock_irqrestore(&steam->lock, flags);
battery = power_supply_register(&steam->hdev->dev,
&steam->battery_desc, &battery_cfg);
if (IS_ERR(battery)) {
ret = PTR_ERR(battery);
hid_err(steam->hdev,
"%s:power_supply_register failed with error %d\n",
__func__, ret);
return ret;
}
rcu_assign_pointer(steam->battery, battery);
power_supply_powers(battery, &steam->hdev->dev);
return 0;
}
static int steam_input_register(struct steam_device *steam)
{
struct hid_device *hdev = steam->hdev;
struct input_dev *input;
int ret;
rcu_read_lock();
input = rcu_dereference(steam->input);
rcu_read_unlock();
if (input) {
dbg_hid("%s: already connected\n", __func__);
return 0;
}
input = input_allocate_device();
if (!input)
return -ENOMEM;
input_set_drvdata(input, steam);
input->dev.parent = &hdev->dev;
input->open = steam_input_open;
input->close = steam_input_close;
input->name = (steam->quirks & STEAM_QUIRK_WIRELESS) ?
"Wireless Steam Controller" :
"Steam Controller";
input->phys = hdev->phys;
input->uniq = steam->serial_no;
input->id.bustype = hdev->bus;
input->id.vendor = hdev->vendor;
input->id.product = hdev->product;
input->id.version = hdev->version;
input_set_capability(input, EV_KEY, BTN_TR2);
input_set_capability(input, EV_KEY, BTN_TL2);
input_set_capability(input, EV_KEY, BTN_TR);
input_set_capability(input, EV_KEY, BTN_TL);
input_set_capability(input, EV_KEY, BTN_Y);
input_set_capability(input, EV_KEY, BTN_B);
input_set_capability(input, EV_KEY, BTN_X);
input_set_capability(input, EV_KEY, BTN_A);
input_set_capability(input, EV_KEY, BTN_DPAD_UP);
input_set_capability(input, EV_KEY, BTN_DPAD_RIGHT);
input_set_capability(input, EV_KEY, BTN_DPAD_LEFT);
input_set_capability(input, EV_KEY, BTN_DPAD_DOWN);
input_set_capability(input, EV_KEY, BTN_SELECT);
input_set_capability(input, EV_KEY, BTN_MODE);
input_set_capability(input, EV_KEY, BTN_START);
input_set_capability(input, EV_KEY, BTN_GEAR_DOWN);
input_set_capability(input, EV_KEY, BTN_GEAR_UP);
input_set_capability(input, EV_KEY, BTN_THUMBR);
input_set_capability(input, EV_KEY, BTN_THUMBL);
input_set_capability(input, EV_KEY, BTN_THUMB);
input_set_capability(input, EV_KEY, BTN_THUMB2);
input_set_abs_params(input, ABS_HAT2Y, 0, 255, 0, 0);
input_set_abs_params(input, ABS_HAT2X, 0, 255, 0, 0);
input_set_abs_params(input, ABS_X, -32767, 32767, 0, 0);
input_set_abs_params(input, ABS_Y, -32767, 32767, 0, 0);
input_set_abs_params(input, ABS_RX, -32767, 32767,
STEAM_PAD_FUZZ, 0);
input_set_abs_params(input, ABS_RY, -32767, 32767,
STEAM_PAD_FUZZ, 0);
input_set_abs_params(input, ABS_HAT0X, -32767, 32767,
STEAM_PAD_FUZZ, 0);
input_set_abs_params(input, ABS_HAT0Y, -32767, 32767,
STEAM_PAD_FUZZ, 0);
input_abs_set_res(input, ABS_X, STEAM_JOYSTICK_RESOLUTION);
input_abs_set_res(input, ABS_Y, STEAM_JOYSTICK_RESOLUTION);
input_abs_set_res(input, ABS_RX, STEAM_PAD_RESOLUTION);
input_abs_set_res(input, ABS_RY, STEAM_PAD_RESOLUTION);
input_abs_set_res(input, ABS_HAT0X, STEAM_PAD_RESOLUTION);
input_abs_set_res(input, ABS_HAT0Y, STEAM_PAD_RESOLUTION);
input_abs_set_res(input, ABS_HAT2Y, STEAM_TRIGGER_RESOLUTION);
input_abs_set_res(input, ABS_HAT2X, STEAM_TRIGGER_RESOLUTION);
ret = input_register_device(input);
if (ret)
goto input_register_fail;
rcu_assign_pointer(steam->input, input);
return 0;
input_register_fail:
input_free_device(input);
return ret;
}
static void steam_input_unregister(struct steam_device *steam)
{
struct input_dev *input;
rcu_read_lock();
input = rcu_dereference(steam->input);
rcu_read_unlock();
if (!input)
return;
RCU_INIT_POINTER(steam->input, NULL);
synchronize_rcu();
input_unregister_device(input);
}
static void steam_battery_unregister(struct steam_device *steam)
{
struct power_supply *battery;
rcu_read_lock();
battery = rcu_dereference(steam->battery);
rcu_read_unlock();
if (!battery)
return;
RCU_INIT_POINTER(steam->battery, NULL);
synchronize_rcu();
power_supply_unregister(battery);
}
static int steam_register(struct steam_device *steam)
{
int ret;
bool client_opened;
/*
* This function can be called several times in a row with the
* wireless adaptor, without steam_unregister() between them, because
* another client send a get_connection_status command, for example.
* The battery and serial number are set just once per device.
*/
if (!steam->serial_no[0]) {
/*
* Unlikely, but getting the serial could fail, and it is not so
* important, so make up a serial number and go on.
*/
mutex_lock(&steam->mutex);
if (steam_get_serial(steam) < 0)
strscpy(steam->serial_no, "XXXXXXXXXX",
sizeof(steam->serial_no));
mutex_unlock(&steam->mutex);
hid_info(steam->hdev, "Steam Controller '%s' connected",
steam->serial_no);
/* ignore battery errors, we can live without it */
if (steam->quirks & STEAM_QUIRK_WIRELESS)
steam_battery_register(steam);
mutex_lock(&steam_devices_lock);
if (list_empty(&steam->list))
list_add(&steam->list, &steam_devices);
mutex_unlock(&steam_devices_lock);
}
mutex_lock(&steam->mutex);
client_opened = steam->client_opened;
if (!client_opened)
steam_set_lizard_mode(steam, lizard_mode);
mutex_unlock(&steam->mutex);
if (!client_opened)
ret = steam_input_register(steam);
else
ret = 0;
return ret;
}
static void steam_unregister(struct steam_device *steam)
{
steam_battery_unregister(steam);
steam_input_unregister(steam);
if (steam->serial_no[0]) {
hid_info(steam->hdev, "Steam Controller '%s' disconnected",
steam->serial_no);
mutex_lock(&steam_devices_lock);
list_del_init(&steam->list);
mutex_unlock(&steam_devices_lock);
steam->serial_no[0] = 0;
}
}
static void steam_work_connect_cb(struct work_struct *work)
{
struct steam_device *steam = container_of(work, struct steam_device,
work_connect);
unsigned long flags;
bool connected;
int ret;
spin_lock_irqsave(&steam->lock, flags);
connected = steam->connected;
spin_unlock_irqrestore(&steam->lock, flags);
if (connected) {
ret = steam_register(steam);
if (ret) {
hid_err(steam->hdev,
"%s:steam_register failed with error %d\n",
__func__, ret);
}
} else {
steam_unregister(steam);
}
}
static bool steam_is_valve_interface(struct hid_device *hdev)
{
struct hid_report_enum *rep_enum;
/*
* The wired device creates 3 interfaces:
* 0: emulated mouse.
* 1: emulated keyboard.
* 2: the real game pad.
* The wireless device creates 5 interfaces:
* 0: emulated keyboard.
* 1-4: slots where up to 4 real game pads will be connected to.
* We know which one is the real gamepad interface because they are the
* only ones with a feature report.
*/
rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
return !list_empty(&rep_enum->report_list);
}
static int steam_client_ll_parse(struct hid_device *hdev)
{
struct steam_device *steam = hdev->driver_data;
return hid_parse_report(hdev, steam->hdev->dev_rdesc,
steam->hdev->dev_rsize);
}
static int steam_client_ll_start(struct hid_device *hdev)
{
return 0;
}
static void steam_client_ll_stop(struct hid_device *hdev)
{
}
static int steam_client_ll_open(struct hid_device *hdev)
{
struct steam_device *steam = hdev->driver_data;
mutex_lock(&steam->mutex);
steam->client_opened = true;
mutex_unlock(&steam->mutex);
steam_input_unregister(steam);
return 0;
}
static void steam_client_ll_close(struct hid_device *hdev)
{
struct steam_device *steam = hdev->driver_data;
unsigned long flags;
bool connected;
spin_lock_irqsave(&steam->lock, flags);
connected = steam->connected;
spin_unlock_irqrestore(&steam->lock, flags);
mutex_lock(&steam->mutex);
steam->client_opened = false;
if (connected)
steam_set_lizard_mode(steam, lizard_mode);
mutex_unlock(&steam->mutex);
if (connected)
steam_input_register(steam);
}
static int steam_client_ll_raw_request(struct hid_device *hdev,
unsigned char reportnum, u8 *buf,
size_t count, unsigned char report_type,
int reqtype)
{
struct steam_device *steam = hdev->driver_data;
return hid_hw_raw_request(steam->hdev, reportnum, buf, count,
report_type, reqtype);
}
static struct hid_ll_driver steam_client_ll_driver = {
.parse = steam_client_ll_parse,
.start = steam_client_ll_start,
.stop = steam_client_ll_stop,
.open = steam_client_ll_open,
.close = steam_client_ll_close,
.raw_request = steam_client_ll_raw_request,
};
static struct hid_device *steam_create_client_hid(struct hid_device *hdev)
{
struct hid_device *client_hdev;
client_hdev = hid_allocate_device();
if (IS_ERR(client_hdev))
return client_hdev;
client_hdev->ll_driver = &steam_client_ll_driver;
client_hdev->dev.parent = hdev->dev.parent;
client_hdev->bus = hdev->bus;
client_hdev->vendor = hdev->vendor;
client_hdev->product = hdev->product;
client_hdev->version = hdev->version;
client_hdev->type = hdev->type;
client_hdev->country = hdev->country;
strscpy(client_hdev->name, hdev->name,
sizeof(client_hdev->name));
strscpy(client_hdev->phys, hdev->phys,
sizeof(client_hdev->phys));
/*
* Since we use the same device info than the real interface to
* trick userspace, we will be calling steam_probe recursively.
* We need to recognize the client interface somehow.
*/
client_hdev->group = HID_GROUP_STEAM;
return client_hdev;
}
static int steam_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
struct steam_device *steam;
int ret;
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev,
"%s:parse of hid interface failed\n", __func__);
return ret;
}
/*
* The virtual client_dev is only used for hidraw.
* Also avoid the recursive probe.
*/
if (hdev->group == HID_GROUP_STEAM)
return hid_hw_start(hdev, HID_CONNECT_HIDRAW);
/*
* The non-valve interfaces (mouse and keyboard emulation) are
* connected without changes.
*/
if (!steam_is_valve_interface(hdev))
return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
steam = devm_kzalloc(&hdev->dev, sizeof(*steam), GFP_KERNEL);
if (!steam) {
ret = -ENOMEM;
goto steam_alloc_fail;
}
steam->hdev = hdev;
hid_set_drvdata(hdev, steam);
spin_lock_init(&steam->lock);
mutex_init(&steam->mutex);
steam->quirks = id->driver_data;
INIT_WORK(&steam->work_connect, steam_work_connect_cb);
INIT_LIST_HEAD(&steam->list);
steam->client_hdev = steam_create_client_hid(hdev);
if (IS_ERR(steam->client_hdev)) {
ret = PTR_ERR(steam->client_hdev);
goto client_hdev_fail;
}
steam->client_hdev->driver_data = steam;
/*
* With the real steam controller interface, do not connect hidraw.
* Instead, create the client_hid and connect that.
*/
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_HIDRAW);
if (ret)
goto hid_hw_start_fail;
ret = hid_add_device(steam->client_hdev);
if (ret)
goto client_hdev_add_fail;
ret = hid_hw_open(hdev);
if (ret) {
hid_err(hdev,
"%s:hid_hw_open\n",
__func__);
goto hid_hw_open_fail;
}
if (steam->quirks & STEAM_QUIRK_WIRELESS) {
hid_info(hdev, "Steam wireless receiver connected");
/* If using a wireless adaptor ask for connection status */
steam->connected = false;
steam_request_conn_status(steam);
} else {
/* A wired connection is always present */
steam->connected = true;
ret = steam_register(steam);
if (ret) {
hid_err(hdev,
"%s:steam_register failed with error %d\n",
__func__, ret);
goto input_register_fail;
}
}
return 0;
input_register_fail:
hid_hw_open_fail:
client_hdev_add_fail:
hid_hw_stop(hdev);
hid_hw_start_fail:
hid_destroy_device(steam->client_hdev);
client_hdev_fail:
cancel_work_sync(&steam->work_connect);
steam_alloc_fail:
hid_err(hdev, "%s: failed with error %d\n",
__func__, ret);
return ret;
}
static void steam_remove(struct hid_device *hdev)
{
struct steam_device *steam = hid_get_drvdata(hdev);
if (!steam || hdev->group == HID_GROUP_STEAM) {
hid_hw_stop(hdev);
return;
}
hid_destroy_device(steam->client_hdev);
steam->client_opened = false;
cancel_work_sync(&steam->work_connect);
if (steam->quirks & STEAM_QUIRK_WIRELESS) {
hid_info(hdev, "Steam wireless receiver disconnected");
}
hid_hw_close(hdev);
hid_hw_stop(hdev);
steam_unregister(steam);
}
static void steam_do_connect_event(struct steam_device *steam, bool connected)
{
unsigned long flags;
bool changed;
spin_lock_irqsave(&steam->lock, flags);
changed = steam->connected != connected;
steam->connected = connected;
spin_unlock_irqrestore(&steam->lock, flags);
if (changed && schedule_work(&steam->work_connect) == 0)
dbg_hid("%s: connected=%d event already queued\n",
__func__, connected);
}
/*
* Some input data in the protocol has the opposite sign.
* Clamp the values to 32767..-32767 so that the range is
* symmetrical and can be negated safely.
*/
static inline s16 steam_le16(u8 *data)
{
s16 x = (s16) le16_to_cpup((__le16 *)data);
return x == -32768 ? -32767 : x;
}
/*
* The size for this message payload is 60.
* The known values are:
* (* values are not sent through wireless)
* (* accelerator/gyro is disabled by default)
* Offset| Type | Mapped to |Meaning
* -------+-------+-----------+--------------------------
* 4-7 | u32 | -- | sequence number
* 8-10 | 24bit | see below | buttons
* 11 | u8 | ABS_HAT2Y | left trigger
* 12 | u8 | ABS_HAT2X | right trigger
* 13-15 | -- | -- | always 0
* 16-17 | s16 | ABS_X/ABS_HAT0X | X value
* 18-19 | s16 | ABS_Y/ABS_HAT0Y | Y value
* 20-21 | s16 | ABS_RX | right-pad X value
* 22-23 | s16 | ABS_RY | right-pad Y value
* 24-25 | s16 | -- | * left trigger
* 26-27 | s16 | -- | * right trigger
* 28-29 | s16 | -- | * accelerometer X value
* 30-31 | s16 | -- | * accelerometer Y value
* 32-33 | s16 | -- | * accelerometer Z value
* 34-35 | s16 | -- | gyro X value
* 36-36 | s16 | -- | gyro Y value
* 38-39 | s16 | -- | gyro Z value
* 40-41 | s16 | -- | quaternion W value
* 42-43 | s16 | -- | quaternion X value
* 44-45 | s16 | -- | quaternion Y value
* 46-47 | s16 | -- | quaternion Z value
* 48-49 | -- | -- | always 0
* 50-51 | s16 | -- | * left trigger (uncalibrated)
* 52-53 | s16 | -- | * right trigger (uncalibrated)
* 54-55 | s16 | -- | * joystick X value (uncalibrated)
* 56-57 | s16 | -- | * joystick Y value (uncalibrated)
* 58-59 | s16 | -- | * left-pad X value
* 60-61 | s16 | -- | * left-pad Y value
* 62-63 | u16 | -- | * battery voltage
*
* The buttons are:
* Bit | Mapped to | Description
* ------+------------+--------------------------------
* 8.0 | BTN_TR2 | right trigger fully pressed
* 8.1 | BTN_TL2 | left trigger fully pressed
* 8.2 | BTN_TR | right shoulder
* 8.3 | BTN_TL | left shoulder
* 8.4 | BTN_Y | button Y
* 8.5 | BTN_B | button B
* 8.6 | BTN_X | button X
* 8.7 | BTN_A | button A
* 9.0 | BTN_DPAD_UP | lef-pad up
* 9.1 | BTN_DPAD_RIGHT | lef-pad right
* 9.2 | BTN_DPAD_LEFT | lef-pad left
* 9.3 | BTN_DPAD_DOWN | lef-pad down
* 9.4 | BTN_SELECT | menu left
* 9.5 | BTN_MODE | steam logo
* 9.6 | BTN_START | menu right
* 9.7 | BTN_GEAR_DOWN | left back lever
* 10.0 | BTN_GEAR_UP | right back lever
* 10.1 | -- | left-pad clicked
* 10.2 | BTN_THUMBR | right-pad clicked
* 10.3 | BTN_THUMB | left-pad touched (but see explanation below)
* 10.4 | BTN_THUMB2 | right-pad touched
* 10.5 | -- | unknown
* 10.6 | BTN_THUMBL | joystick clicked
* 10.7 | -- | lpad_and_joy
*/
static void steam_do_input_event(struct steam_device *steam,
struct input_dev *input, u8 *data)
{
/* 24 bits of buttons */
u8 b8, b9, b10;
s16 x, y;
bool lpad_touched, lpad_and_joy;
b8 = data[8];
b9 = data[9];
b10 = data[10];
input_report_abs(input, ABS_HAT2Y, data[11]);
input_report_abs(input, ABS_HAT2X, data[12]);
/*
* These two bits tells how to interpret the values X and Y.
* lpad_and_joy tells that the joystick and the lpad are used at the
* same time.
* lpad_touched tells whether X/Y are to be read as lpad coord or
* joystick values.
* (lpad_touched || lpad_and_joy) tells if the lpad is really touched.
*/
lpad_touched = b10 & BIT(3);
lpad_and_joy = b10 & BIT(7);
x = steam_le16(data + 16);
y = -steam_le16(data + 18);
input_report_abs(input, lpad_touched ? ABS_HAT0X : ABS_X, x);
input_report_abs(input, lpad_touched ? ABS_HAT0Y : ABS_Y, y);
/* Check if joystick is centered */
if (lpad_touched && !lpad_and_joy) {
input_report_abs(input, ABS_X, 0);
input_report_abs(input, ABS_Y, 0);
}
/* Check if lpad is untouched */
if (!(lpad_touched || lpad_and_joy)) {
input_report_abs(input, ABS_HAT0X, 0);
input_report_abs(input, ABS_HAT0Y, 0);
}
input_report_abs(input, ABS_RX, steam_le16(data + 20));
input_report_abs(input, ABS_RY, -steam_le16(data + 22));
input_event(input, EV_KEY, BTN_TR2, !!(b8 & BIT(0)));
input_event(input, EV_KEY, BTN_TL2, !!(b8 & BIT(1)));
input_event(input, EV_KEY, BTN_TR, !!(b8 & BIT(2)));
input_event(input, EV_KEY, BTN_TL, !!(b8 & BIT(3)));
input_event(input, EV_KEY, BTN_Y, !!(b8 & BIT(4)));
input_event(input, EV_KEY, BTN_B, !!(b8 & BIT(5)));
input_event(input, EV_KEY, BTN_X, !!(b8 & BIT(6)));
input_event(input, EV_KEY, BTN_A, !!(b8 & BIT(7)));
input_event(input, EV_KEY, BTN_SELECT, !!(b9 & BIT(4)));
input_event(input, EV_KEY, BTN_MODE, !!(b9 & BIT(5)));
input_event(input, EV_KEY, BTN_START, !!(b9 & BIT(6)));
input_event(input, EV_KEY, BTN_GEAR_DOWN, !!(b9 & BIT(7)));
input_event(input, EV_KEY, BTN_GEAR_UP, !!(b10 & BIT(0)));
input_event(input, EV_KEY, BTN_THUMBR, !!(b10 & BIT(2)));
input_event(input, EV_KEY, BTN_THUMBL, !!(b10 & BIT(6)));
input_event(input, EV_KEY, BTN_THUMB, lpad_touched || lpad_and_joy);
input_event(input, EV_KEY, BTN_THUMB2, !!(b10 & BIT(4)));
input_event(input, EV_KEY, BTN_DPAD_UP, !!(b9 & BIT(0)));
input_event(input, EV_KEY, BTN_DPAD_RIGHT, !!(b9 & BIT(1)));
input_event(input, EV_KEY, BTN_DPAD_LEFT, !!(b9 & BIT(2)));
input_event(input, EV_KEY, BTN_DPAD_DOWN, !!(b9 & BIT(3)));
input_sync(input);
}
/*
* The size for this message payload is 11.
* The known values are:
* Offset| Type | Meaning
* -------+-------+---------------------------
* 4-7 | u32 | sequence number
* 8-11 | -- | always 0
* 12-13 | u16 | voltage (mV)
* 14 | u8 | battery percent
*/
static void steam_do_battery_event(struct steam_device *steam,
struct power_supply *battery, u8 *data)
{
unsigned long flags;
s16 volts = steam_le16(data + 12);
u8 batt = data[14];
/* Creating the battery may have failed */
rcu_read_lock();
battery = rcu_dereference(steam->battery);
if (likely(battery)) {
spin_lock_irqsave(&steam->lock, flags);
steam->voltage = volts;
steam->battery_charge = batt;
spin_unlock_irqrestore(&steam->lock, flags);
power_supply_changed(battery);
}
rcu_read_unlock();
}
static int steam_raw_event(struct hid_device *hdev,
struct hid_report *report, u8 *data,
int size)
{
struct steam_device *steam = hid_get_drvdata(hdev);
struct input_dev *input;
struct power_supply *battery;
if (!steam)
return 0;
if (steam->client_opened)
hid_input_report(steam->client_hdev, HID_FEATURE_REPORT,
data, size, 0);
/*
* All messages are size=64, all values little-endian.
* The format is:
* Offset| Meaning
* -------+--------------------------------------------
* 0-1 | always 0x01, 0x00, maybe protocol version?
* 2 | type of message
* 3 | length of the real payload (not checked)
* 4-n | payload data, depends on the type
*
* There are these known types of message:
* 0x01: input data (60 bytes)
* 0x03: wireless connect/disconnect (1 byte)
* 0x04: battery status (11 bytes)
*/
if (size != 64 || data[0] != 1 || data[1] != 0)
return 0;
switch (data[2]) {
case STEAM_EV_INPUT_DATA:
if (steam->client_opened)
return 0;
rcu_read_lock();
input = rcu_dereference(steam->input);
if (likely(input))
steam_do_input_event(steam, input, data);
rcu_read_unlock();
break;
case STEAM_EV_CONNECT:
/*
* The payload of this event is a single byte:
* 0x01: disconnected.
* 0x02: connected.
*/
switch (data[4]) {
case 0x01:
steam_do_connect_event(steam, false);
break;
case 0x02:
steam_do_connect_event(steam, true);
break;
}
break;
case STEAM_EV_BATTERY:
if (steam->quirks & STEAM_QUIRK_WIRELESS) {
rcu_read_lock();
battery = rcu_dereference(steam->battery);
if (likely(battery)) {
steam_do_battery_event(steam, battery, data);
} else {
dbg_hid(
"%s: battery data without connect event\n",
__func__);
steam_do_connect_event(steam, true);
}
rcu_read_unlock();
}
break;
}
return 0;
}
static int steam_param_set_lizard_mode(const char *val,
const struct kernel_param *kp)
{
struct steam_device *steam;
int ret;
ret = param_set_bool(val, kp);
if (ret)
return ret;
mutex_lock(&steam_devices_lock);
list_for_each_entry(steam, &steam_devices, list) {
mutex_lock(&steam->mutex);
if (!steam->client_opened)
steam_set_lizard_mode(steam, lizard_mode);
mutex_unlock(&steam->mutex);
}
mutex_unlock(&steam_devices_lock);
return 0;
}
static const struct kernel_param_ops steam_lizard_mode_ops = {
.set = steam_param_set_lizard_mode,
.get = param_get_bool,
};
module_param_cb(lizard_mode, &steam_lizard_mode_ops, &lizard_mode, 0644);
MODULE_PARM_DESC(lizard_mode,
"Enable mouse and keyboard emulation (lizard mode) when the gamepad is not in use");
static const struct hid_device_id steam_controllers[] = {
{ /* Wired Steam Controller */
HID_USB_DEVICE(USB_VENDOR_ID_VALVE,
USB_DEVICE_ID_STEAM_CONTROLLER)
},
{ /* Wireless Steam Controller */
HID_USB_DEVICE(USB_VENDOR_ID_VALVE,
USB_DEVICE_ID_STEAM_CONTROLLER_WIRELESS),
.driver_data = STEAM_QUIRK_WIRELESS
},
{}
};
MODULE_DEVICE_TABLE(hid, steam_controllers);
static struct hid_driver steam_controller_driver = {
.name = "hid-steam",
.id_table = steam_controllers,
.probe = steam_probe,
.remove = steam_remove,
.raw_event = steam_raw_event,
};
module_hid_driver(steam_controller_driver);