From: Roderick Colenbrander <roderick.colenbrander@xxxxxxxx>
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@xxxxxxxx>
---
drivers/hid/Kconfig | 1 +
drivers/hid/hid-playstation.c | 41 +++++++++++++++++++++++++++++++++++
2 files changed, 42 insertions(+)
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 0c141f2312f7..b3ec01c7a0b7 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -856,6 +856,7 @@ config HID_PLANTRONICS
config HID_PLAYSTATION
tristate "PlayStation HID Driver"
depends on HID
+ select CRC32
select POWER_SUPPLY
help
Provides support for Sony PS5 controllers including support for
diff --git a/drivers/hid/hid-playstation.c b/drivers/hid/hid-playstation.c
index a14c33a52c8f..bcf93836beb2 100644
--- a/drivers/hid/hid-playstation.c
+++ b/drivers/hid/hid-playstation.c
@@ -6,6 +6,7 @@
*/
#include <linux/bits.h>
+#include <linux/crc32.h>
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/input/mt.h>
@@ -45,8 +46,14 @@ struct ps_calibration_data {
int sens_denom;
};
+/* Seed values for DualShock4 / DualSense CRC32 for different report types. */
+#define PS_INPUT_CRC32_SEED 0xA1
+#define PS_FEATURE_CRC32_SEED 0xA3
+
#define DS_INPUT_REPORT_USB 0x01
#define DS_INPUT_REPORT_USB_SIZE 64
+#define DS_INPUT_REPORT_BT 0x31
+#define DS_INPUT_REPORT_BT_SIZE 78
#define DS_FEATURE_REPORT_CALIBRATION 0x05
#define DS_FEATURE_REPORT_CALIBRATION_SIZE 41
@@ -292,6 +299,17 @@ 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;
@@ -342,6 +360,17 @@ static int ps_get_report(struct hid_device *hdev, uint8_t report_id, uint8_t *bu
return -EINVAL;
}
+ if (hdev->bus == BUS_BLUETOOTH) {
+ /* Last 4 bytes contains crc32. */
+ uint8_t crc_offset = size - 4;
+ uint32_t report_crc = get_unaligned_le32(&buf[crc_offset]);
+
+ if (!ps_check_crc32(PS_FEATURE_CRC32_SEED, buf, crc_offset, report_crc)) {
+ hid_err(hdev, "CRC check failed for reportID=%d\n", report_id);
+ return -EILSEQ;
+ }
+ }
+
return 0;
}
@@ -543,6 +572,17 @@ static int dualsense_parse_report(struct ps_device *ps_dev, struct hid_report *r
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 if (hdev->bus == BUS_BLUETOOTH && report->id == DS_INPUT_REPORT_BT &&
+ size == DS_INPUT_REPORT_BT_SIZE) {
+ /* Last 4 bytes of input report contain crc32 */
+ uint32_t report_crc = get_unaligned_le32(&data[size - 4]);
+
+ if (!ps_check_crc32(PS_INPUT_CRC32_SEED, data, size - 4, report_crc)) {
+ hid_err(hdev, "DualSense input CRC's check failed\n");
+ return -EILSEQ;
+ }
+
+ ds_report = (struct dualsense_input_report *)&data[2];
} else {
hid_err(hdev, "Unhandled reportID=%d\n", report->id);
return -1;
@@ -806,6 +846,7 @@ 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) },
{ HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS5_CONTROLLER) },
{ }
};
--
2.26.2
