HID: playstation: initial DualSense USB support.

Implement support for PlayStation DualSense gamepad in USB mode.
Support features include buttons and sticks, which adhere to the
Linux gamepad spec.

Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Reviewed-by: Barnabás Pőcze <pobrn@protonmail.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

1 files changed, 328 insertions, 0 deletions

diff --git a/drivers/hid/hid-playstation.c b/drivers/hid/hid-playstation.c
new file mode 100644
index 000000000000..7d4171a89322
--- /dev/null
+++ b/drivers/hid/hid-playstation.c
@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  HID driver for Sony DualSense(TM) controller.
+ *
+ *  Copyright (c) 2020 Sony Interactive Entertainment
+ */
+
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/input/mt.h>
+#include <linux/module.h>
+
+#include <asm/unaligned.h>
+
+#include "hid-ids.h"
+
+#define HID_PLAYSTATION_VERSION_PATCH 0x8000
+
+/* Base class for playstation devices. */
+struct ps_device {
+	struct hid_device *hdev;
+
+	int (*parse_report)(struct ps_device *dev, struct hid_report *report, u8 *data, int size);
+};
+
+#define DS_INPUT_REPORT_USB			0x01
+#define DS_INPUT_REPORT_USB_SIZE		64
+
+/* Button masks for DualSense input report. */
+#define DS_BUTTONS0_HAT_SWITCH	GENMASK(3, 0)
+#define DS_BUTTONS0_SQUARE	BIT(4)
+#define DS_BUTTONS0_CROSS	BIT(5)
+#define DS_BUTTONS0_CIRCLE	BIT(6)
+#define DS_BUTTONS0_TRIANGLE	BIT(7)
+#define DS_BUTTONS1_L1		BIT(0)
+#define DS_BUTTONS1_R1		BIT(1)
+#define DS_BUTTONS1_L2		BIT(2)
+#define DS_BUTTONS1_R2		BIT(3)
+#define DS_BUTTONS1_CREATE	BIT(4)
+#define DS_BUTTONS1_OPTIONS	BIT(5)
+#define DS_BUTTONS1_L3		BIT(6)
+#define DS_BUTTONS1_R3		BIT(7)
+#define DS_BUTTONS2_PS_HOME	BIT(0)
+#define DS_BUTTONS2_TOUCHPAD	BIT(1)
+
+struct dualsense {
+	struct ps_device base;
+	struct input_dev *gamepad;
+};
+
+struct dualsense_touch_point {
+	uint8_t contact;
+	uint8_t x_lo;
+	uint8_t x_hi:4, y_lo:4;
+	uint8_t y_hi;
+} __packed;
+static_assert(sizeof(struct dualsense_touch_point) == 4);
+
+/* Main DualSense input report excluding any BT/USB specific headers. */
+struct dualsense_input_report {
+	uint8_t x, y;
+	uint8_t rx, ry;
+	uint8_t z, rz;
+	uint8_t seq_number;
+	uint8_t buttons[4];
+	uint8_t reserved[4];
+
+	/* Motion sensors */
+	__le16 gyro[3]; /* x, y, z */
+	__le16 accel[3]; /* x, y, z */
+	__le32 sensor_timestamp;
+	uint8_t reserved2;
+
+	/* Touchpad */
+	struct dualsense_touch_point points[2];
+
+	uint8_t reserved3[12];
+	uint8_t status;
+	uint8_t reserved4[10];
+} __packed;
+/* Common input report size shared equals the size of the USB report minus 1 byte for ReportID. */
+static_assert(sizeof(struct dualsense_input_report) == DS_INPUT_REPORT_USB_SIZE - 1);
+
+/*
+ * Common gamepad buttons across DualShock 3 / 4 and DualSense.
+ * Note: for device with a touchpad, touchpad button is not included
+ *        as it will be part of the touchpad device.
+ */
+static const int ps_gamepad_buttons[] = {
+	BTN_WEST, /* Square */
+	BTN_NORTH, /* Triangle */
+	BTN_EAST, /* Circle */
+	BTN_SOUTH, /* Cross */
+	BTN_TL, /* L1 */
+	BTN_TR, /* R1 */
+	BTN_TL2, /* L2 */
+	BTN_TR2, /* R2 */
+	BTN_SELECT, /* Create (PS5) / Share (PS4) */
+	BTN_START, /* Option */
+	BTN_THUMBL, /* L3 */
+	BTN_THUMBR, /* R3 */
+	BTN_MODE, /* PS Home */
+};
+
+static const struct {int x; int y; } ps_gamepad_hat_mapping[] = {
+	{0, -1}, {1, -1}, {1, 0}, {1, 1}, {0, 1}, {-1, 1}, {-1, 0}, {-1, -1},
+	{0, 0},
+};
+
+static struct input_dev *ps_allocate_input_dev(struct hid_device *hdev, const char *name_suffix)
+{
+	struct input_dev *input_dev;
+
+	input_dev = devm_input_allocate_device(&hdev->dev);
+	if (!input_dev)
+		return ERR_PTR(-ENOMEM);
+
+	input_dev->id.bustype = hdev->bus;
+	input_dev->id.vendor = hdev->vendor;
+	input_dev->id.product = hdev->product;
+	input_dev->id.version = hdev->version;
+	input_dev->uniq = hdev->uniq;
+
+	if (name_suffix) {
+		input_dev->name = devm_kasprintf(&hdev->dev, GFP_KERNEL, "%s %s", hdev->name,
+				name_suffix);
+		if (!input_dev->name)
+			return ERR_PTR(-ENOMEM);
+	} else {
+		input_dev->name = hdev->name;
+	}
+
+	input_set_drvdata(input_dev, hdev);
+
+	return input_dev;
+}
+
+static struct input_dev *ps_gamepad_create(struct hid_device *hdev)
+{
+	struct input_dev *gamepad;
+	unsigned int i;
+	int ret;
+
+	gamepad = ps_allocate_input_dev(hdev, NULL);
+	if (IS_ERR(gamepad))
+		return ERR_CAST(gamepad);
+
+	input_set_abs_params(gamepad, ABS_X, 0, 255, 0, 0);
+	input_set_abs_params(gamepad, ABS_Y, 0, 255, 0, 0);
+	input_set_abs_params(gamepad, ABS_Z, 0, 255, 0, 0);
+	input_set_abs_params(gamepad, ABS_RX, 0, 255, 0, 0);
+	input_set_abs_params(gamepad, ABS_RY, 0, 255, 0, 0);
+	input_set_abs_params(gamepad, ABS_RZ, 0, 255, 0, 0);
+
+	input_set_abs_params(gamepad, ABS_HAT0X, -1, 1, 0, 0);
+	input_set_abs_params(gamepad, ABS_HAT0Y, -1, 1, 0, 0);
+
+	for (i = 0; i < ARRAY_SIZE(ps_gamepad_buttons); i++)
+		input_set_capability(gamepad, EV_KEY, ps_gamepad_buttons[i]);
+
+	ret = input_register_device(gamepad);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return gamepad;
+}
+
+static int dualsense_parse_report(struct ps_device *ps_dev, struct hid_report *report,
+		u8 *data, int size)
+{
+	struct hid_device *hdev = ps_dev->hdev;
+	struct dualsense *ds = container_of(ps_dev, struct dualsense, base);
+	struct dualsense_input_report *ds_report;
+	uint8_t value;
+
+	/*
+	 * DualSense in USB uses the full HID report for reportID 1, but
+	 * Bluetooth uses a minimal HID report for reportID 1 and reports
+	 * the full report using reportID 49.
+	 */
+	if (hdev->bus == BUS_USB && report->id == DS_INPUT_REPORT_USB &&
+			size == DS_INPUT_REPORT_USB_SIZE) {
+		ds_report = (struct dualsense_input_report *)&data[1];
+	} else {
+		hid_err(hdev, "Unhandled reportID=%d\n", report->id);
+		return -1;
+	}
+
+	input_report_abs(ds->gamepad, ABS_X,  ds_report->x);
+	input_report_abs(ds->gamepad, ABS_Y,  ds_report->y);
+	input_report_abs(ds->gamepad, ABS_RX, ds_report->rx);
+	input_report_abs(ds->gamepad, ABS_RY, ds_report->ry);
+	input_report_abs(ds->gamepad, ABS_Z,  ds_report->z);
+	input_report_abs(ds->gamepad, ABS_RZ, ds_report->rz);
+
+	value = ds_report->buttons[0] & DS_BUTTONS0_HAT_SWITCH;
+	if (value > ARRAY_SIZE(ps_gamepad_hat_mapping))
+		value = 8; /* center */
+	input_report_abs(ds->gamepad, ABS_HAT0X, ps_gamepad_hat_mapping[value].x);
+	input_report_abs(ds->gamepad, ABS_HAT0Y, ps_gamepad_hat_mapping[value].y);
+
+	input_report_key(ds->gamepad, BTN_WEST,   ds_report->buttons[0] & DS_BUTTONS0_SQUARE);
+	input_report_key(ds->gamepad, BTN_SOUTH,  ds_report->buttons[0] & DS_BUTTONS0_CROSS);
+	input_report_key(ds->gamepad, BTN_EAST,   ds_report->buttons[0] & DS_BUTTONS0_CIRCLE);
+	input_report_key(ds->gamepad, BTN_NORTH,  ds_report->buttons[0] & DS_BUTTONS0_TRIANGLE);
+	input_report_key(ds->gamepad, BTN_TL,     ds_report->buttons[1] & DS_BUTTONS1_L1);
+	input_report_key(ds->gamepad, BTN_TR,     ds_report->buttons[1] & DS_BUTTONS1_R1);
+	input_report_key(ds->gamepad, BTN_TL2,    ds_report->buttons[1] & DS_BUTTONS1_L2);
+	input_report_key(ds->gamepad, BTN_TR2,    ds_report->buttons[1] & DS_BUTTONS1_R2);
+	input_report_key(ds->gamepad, BTN_SELECT, ds_report->buttons[1] & DS_BUTTONS1_CREATE);
+	input_report_key(ds->gamepad, BTN_START,  ds_report->buttons[1] & DS_BUTTONS1_OPTIONS);
+	input_report_key(ds->gamepad, BTN_THUMBL, ds_report->buttons[1] & DS_BUTTONS1_L3);
+	input_report_key(ds->gamepad, BTN_THUMBR, ds_report->buttons[1] & DS_BUTTONS1_R3);
+	input_report_key(ds->gamepad, BTN_MODE,   ds_report->buttons[2] & DS_BUTTONS2_PS_HOME);
+	input_sync(ds->gamepad);
+
+	return 0;
+}
+
+static struct ps_device *dualsense_create(struct hid_device *hdev)
+{
+	struct dualsense *ds;
+	int ret;
+
+	ds = devm_kzalloc(&hdev->dev, sizeof(*ds), GFP_KERNEL);
+	if (!ds)
+		return ERR_PTR(-ENOMEM);
+
+	/*
+	 * Patch version to allow userspace to distinguish between
+	 * hid-generic vs hid-playstation axis and button mapping.
+	 */
+	hdev->version |= HID_PLAYSTATION_VERSION_PATCH;
+
+	ds->base.hdev = hdev;
+	ds->base.parse_report = dualsense_parse_report;
+	hid_set_drvdata(hdev, ds);
+
+	ds->gamepad = ps_gamepad_create(hdev);
+	if (IS_ERR(ds->gamepad)) {
+		ret = PTR_ERR(ds->gamepad);
+		goto err;
+	}
+
+	return &ds->base;
+
+err:
+	return ERR_PTR(ret);
+}
+
+static int ps_raw_event(struct hid_device *hdev, struct hid_report *report,
+		u8 *data, int size)
+{
+	struct ps_device *dev = hid_get_drvdata(hdev);
+
+	if (dev && dev->parse_report)
+		return dev->parse_report(dev, report, data, size);
+
+	return 0;
+}
+
+static int ps_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	struct ps_device *dev;
+	int ret;
+
+	ret = hid_parse(hdev);
+	if (ret) {
+		hid_err(hdev, "Parse failed\n");
+		return ret;
+	}
+
+	ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
+	if (ret) {
+		hid_err(hdev, "Failed to start HID device\n");
+		return ret;
+	}
+
+	ret = hid_hw_open(hdev);
+	if (ret) {
+		hid_err(hdev, "Failed to open HID device\n");
+		goto err_stop;
+	}
+
+	if (hdev->product == USB_DEVICE_ID_SONY_PS5_CONTROLLER) {
+		dev = dualsense_create(hdev);
+		if (IS_ERR(dev)) {
+			hid_err(hdev, "Failed to create dualsense.\n");
+			ret = PTR_ERR(dev);
+			goto err_close;
+		}
+	}
+
+	return ret;
+
+err_close:
+	hid_hw_close(hdev);
+err_stop:
+	hid_hw_stop(hdev);
+	return ret;
+}
+
+static void ps_remove(struct hid_device *hdev)
+{
+	hid_hw_close(hdev);
+	hid_hw_stop(hdev);
+}
+
+static const struct hid_device_id ps_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS5_CONTROLLER) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, ps_devices);
+
+static struct hid_driver ps_driver = {
+	.name		= "playstation",
+	.id_table	= ps_devices,
+	.probe		= ps_probe,
+	.remove		= ps_remove,
+	.raw_event	= ps_raw_event,
+};
+
+module_hid_driver(ps_driver);
+
+MODULE_AUTHOR("Sony Interactive Entertainment");
+MODULE_DESCRIPTION("HID Driver for PlayStation peripherals.");
+MODULE_LICENSE("GPL");