From: Roderick Colenbrander <roderick.colenbrander@xxxxxxxx>
Use the DualSense MAC address as a unique identifier for the HID device.
Signed-off-by: Roderick Colenbrander <roderick.colenbrander@xxxxxxxx>
---
drivers/hid/hid-playstation.c | 57 +++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)
diff --git a/drivers/hid/hid-playstation.c b/drivers/hid/hid-playstation.c
index 46d5f5b3b0dd..2f24039dedbe 100644
--- a/drivers/hid/hid-playstation.c
+++ b/drivers/hid/hid-playstation.c
@@ -20,6 +20,7 @@
/* Base class for playstation devices. */
struct ps_device {
struct hid_device *hdev;
+ uint8_t mac_address[6]; /* Note: stored in little endian order. */
int (*parse_report)(struct ps_device *dev, struct hid_report *report, u8 *data, int size);
};
@@ -27,6 +28,9 @@ struct ps_device {
#define DS_INPUT_REPORT_USB 0x01
#define DS_INPUT_REPORT_USB_SIZE 64
+#define DS_FEATURE_REPORT_PAIRING_INFO 0x09
+#define DS_FEATURE_REPORT_PAIRING_INFO_SIZE 20
+
/* Button masks for DualSense input report. */
#define DS_BUTTONS0_HAT_SWITCH GENMASK(3, 0)
#define DS_BUTTONS0_SQUARE BIT(4)
@@ -166,6 +170,52 @@ static struct input_dev *ps_gamepad_create(struct hid_device *hdev)
return gamepad;
}
+static int ps_get_report(struct hid_device *hdev, uint8_t report_id, uint8_t *buf, size_t size)
+{
+ int ret;
+
+ ret = hid_hw_raw_request(hdev, report_id, buf, size, HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
+ if (ret < 0) {
+ hid_err(hdev, "Failed to retrieve feature with reportID %d: %d\n", report_id, ret);
+ return ret;
+ }
+
+ if (ret != size) {
+ hid_err(hdev, "Invalid byte count transferred, expected %zu got %d\n", size, ret);
+ return -EINVAL;
+ }
+
+ if (buf[0] != report_id) {
+ hid_err(hdev, "Incorrect reportID received, expected %d got %d\n", report_id, buf[0]);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int dualsense_get_mac_address(struct dualsense *ds)
+{
+ uint8_t *buf;
+ int ret = 0;
+
+ buf = kzalloc(DS_FEATURE_REPORT_PAIRING_INFO_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = ps_get_report(ds->base.hdev, DS_FEATURE_REPORT_PAIRING_INFO, buf,
+ DS_FEATURE_REPORT_PAIRING_INFO_SIZE);
+ if (ret) {
+ hid_err(ds->base.hdev, "Failed to retrieve DualSense pairing info: %d\n", ret);
+ goto err_free;
+ }
+
+ memcpy(ds->base.mac_address, &buf[1], sizeof(ds->base.mac_address));
+
+err_free:
+ kfree(buf);
+ return ret;
+}
+
static int dualsense_parse_report(struct ps_device *ps_dev, struct hid_report *report,
u8 *data, int size)
{
@@ -237,6 +287,13 @@ static struct ps_device *dualsense_create(struct hid_device *hdev)
ds->base.parse_report = dualsense_parse_report;
hid_set_drvdata(hdev, ds);
+ ret = dualsense_get_mac_address(ds);
+ if (ret) {
+ hid_err(hdev, "Failed to get MAC address from DualSense\n");
+ return ERR_PTR(ret);
+ }
+ snprintf(hdev->uniq, sizeof(hdev->uniq), "%pMR", ds->base.mac_address);
+
ds->gamepad = ps_gamepad_create(hdev);
if (IS_ERR(ds->gamepad)) {
ret = PTR_ERR(ds->gamepad);
--
2.26.2
