[PATCH 07/13] HID: playstation: add DualSense Bluetooth support.

[Roderick Colenbrander <roderick@gaikai.com>]

From: Roderick Colenbrander <roderick.colenbrander@sony.com>

This patch adds support for the DualSense when operating in Bluetooth mode.
The device has the same behavior as the DualShock 4 in that by default it
sends a limited input report (0x1), but after requesting calibration data,
it switches to an extended input report (report 49), which adds data for
touchpad, motion sensors, battery and more.

Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
---
 drivers/hid/hid-playstation.c | 36 +++++++++++++++++++++++++++++++++++
 drivers/hid/hid-quirks.c      |  1 +
 2 files changed, 37 insertions(+)

diff --git a/drivers/hid/hid-playstation.c b/drivers/hid/hid-playstation.c
index b0c0286cfd2b..042fa8d2627d 100644
--- a/drivers/hid/hid-playstation.c
+++ b/drivers/hid/hid-playstation.c
@@ -43,6 +43,7 @@ struct ps_calibration_data {
 };
 
 #define DS_INPUT_REPORT_USB			0x01
+#define DS_INPUT_REPORT_BT			0x31
 
 #define DS_FEATURE_REPORT_CALIBRATION		5
 #define DS_FEATURE_REPORT_CALIBRATION_SIZE	41
@@ -274,6 +275,17 @@ static int ps_device_register_battery(struct ps_device *dev)
 	return 0;
 }
 
+/* Compute crc32 of HID data and compare against expected CRC. */
+static bool ps_check_crc32(uint8_t seed, uint8_t *data, size_t len, uint32_t report_crc)
+{
+	uint32_t crc;
+
+	crc = crc32_le(0xFFFFFFFF, &seed, 1);
+	crc = ~crc32_le(crc, data, len);
+
+	return crc == report_crc;
+}
+
 static struct input_dev *ps_gamepad_create(struct hid_device *hdev)
 {
 	struct input_dev *gamepad;
@@ -390,6 +402,18 @@ static int dualsense_get_calibration_data(struct dualsense *ds)
 	if (ret < 0)
 		goto err_free;
 
+	if (ds->base.hdev->bus == BUS_BLUETOOTH) {
+		/* Last 4 bytes contains crc32 */
+		uint8_t crc_offset = DS_FEATURE_REPORT_CALIBRATION_SIZE - 4;
+		uint32_t report_crc = get_unaligned_le32(&buf[crc_offset]);
+
+		if (!ps_check_crc32(0xa3, buf, crc_offset, report_crc)) {
+			hid_err(ds->base.hdev, "DualSense calibration report CRC's check failed\n");
+			ret = -EILSEQ;
+			goto err_free;
+		}
+	}
+
 	gyro_pitch_bias  = get_unaligned_le16(&buf[1]);
 	gyro_yaw_bias    = get_unaligned_le16(&buf[3]);
 	gyro_roll_bias   = get_unaligned_le16(&buf[5]);
@@ -494,6 +518,16 @@ static int dualsense_parse_report(struct ps_device *ps_dev, struct hid_report *r
 	 */
 	if (report->id == DS_INPUT_REPORT_USB && hdev->bus == BUS_USB) {
 		ds_report = (struct dualsense_input_report *)&data[1];
+	} else if (report->id == DS_INPUT_REPORT_BT && hdev->bus == BUS_BLUETOOTH) {
+		/* Last 4 bytes of input report contain crc32 */
+		uint32_t report_crc = get_unaligned_le32(&data[size - 4]);
+
+		if (!ps_check_crc32(0xa1, data, size - 4, report_crc)) {
+			hid_err(hdev, "DualSense input CRC's check failed, size=%d\n", size);
+			return -EILSEQ;
+		}
+
+		ds_report = (struct dualsense_input_report *)&data[2];
 	} else {
 		hid_err(hdev, "Unhandled reportID=%d\n", report->id);
 		return -1;
@@ -756,6 +790,8 @@ static void ps_remove(struct hid_device *hdev)
 }
 
 static const struct hid_device_id ps_devices[] = {
+	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS5_CONTROLLER),
+		.driver_data = 0 },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS5_CONTROLLER),
 		.driver_data = 0 },
 };
diff --git a/drivers/hid/hid-quirks.c b/drivers/hid/hid-quirks.c
index 1ca46cb445be..541c8837debd 100644
--- a/drivers/hid/hid-quirks.c
+++ b/drivers/hid/hid-quirks.c
@@ -567,6 +567,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
 #endif
 #if IS_ENABLED(CONFIG_HID_PLAYSTATION)
 	{ HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS5_CONTROLLER) },
++	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS5_CONTROLLER) },
 #endif
 #if IS_ENABLED(CONFIG_HID_PRIMAX)
 	{ HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_KEYBOARD) },
-- 
2.26.2