HID: logitech-dj: make appending of the HID++ descriptors conditional

Make the appending of the HID++ descriptors in logi_dj_ll_parse
conditional. This is a preparation patch for adding support for the
Logitech mini Bluetooth receiver in HID proxy mode (its default mode),
where some of the paired devices may not be Logitech devices and thus may
not be HID++ capable.

This uses a fake bit 63 in reports_supported, which is changed from an
u32 to an u64 for this. Bits <= 31 are not usable for this because that
would cause a behavioral change in logi_dj_recv_forward_null_report.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

1 files changed, 21 insertions, 14 deletions

diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index e30ed320207b..154cc37ed8fd 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -100,6 +100,8 @@
 #define POWER_KEYS				BIT(4)
 #define MEDIA_CENTER				BIT(8)
 #define KBD_LEDS				BIT(14)
+/* Fake (bitnr > NUMBER_OF_HID_REPORTS) bit to track HID++ capability */
+#define HIDPP					BIT_ULL(63)
 
 /* HID++ Device Connected Notification */
 #define REPORT_TYPE_NOTIF_DEVICE_CONNECTED	0x41
@@ -162,7 +164,7 @@ struct dj_receiver_dev {
 struct dj_device {
 	struct hid_device *hdev;
 	struct dj_receiver_dev *dj_receiver_dev;
-	u32 reports_supported;
+	u64 reports_supported;
 	u8 device_index;
 };
 
@@ -177,7 +179,7 @@ struct dj_workitem {
 	u8 device_type;
 	u8 quad_id_msb;
 	u8 quad_id_lsb;
-	u32 reports_supported;
+	u64 reports_supported;
 };
 
 /* Keyboard descriptor (1) */
@@ -805,6 +807,7 @@ static void logi_dj_recv_queue_notification(struct dj_receiver_dev *djrcv_dev,
 		workitem.reports_supported = get_unaligned_le32(
 						dj_report->report_params +
 						DEVICE_PAIRED_RF_REPORT_TYPE);
+		workitem.reports_supported |= HIDPP;
 		if (dj_report->report_type == REPORT_TYPE_NOTIF_DEVICE_UNPAIRED)
 			workitem.type = WORKITEM_TYPE_UNPAIRED;
 		break;
@@ -828,10 +831,11 @@ static void logi_hidpp_dev_conn_notif_equad(struct hidpp_event *hidpp_report,
 	switch (workitem->device_type) {
 	case REPORT_TYPE_KEYBOARD:
 		workitem->reports_supported |= STD_KEYBOARD | MULTIMEDIA |
-					       POWER_KEYS | MEDIA_CENTER;
+					       POWER_KEYS | MEDIA_CENTER |
+					       HIDPP;
 		break;
 	case REPORT_TYPE_MOUSE:
-		workitem->reports_supported |= STD_MOUSE;
+		workitem->reports_supported |= STD_MOUSE | HIDPP;
 		break;
 	}
 }
@@ -846,13 +850,13 @@ static void logi_hidpp_dev_conn_notif_27mhz(struct hid_device *hdev,
 	case 1: /* Index 1 is always a mouse */
 	case 2: /* Index 2 is always a mouse */
 		workitem->device_type = HIDPP_DEVICE_TYPE_MOUSE;
-		workitem->reports_supported |= STD_MOUSE;
+		workitem->reports_supported |= STD_MOUSE | HIDPP;
 		break;
 	case 3: /* Index 3 is always the keyboard */
 	case 4: /* Index 4 is used for an optional separate numpad */
 		workitem->device_type = HIDPP_DEVICE_TYPE_KEYBOARD;
 		workitem->reports_supported |= STD_KEYBOARD | MULTIMEDIA |
-					       POWER_KEYS;
+					       POWER_KEYS | HIDPP;
 		break;
 	default:
 		hid_warn(hdev, "%s: unexpected device-index %d", __func__,
@@ -1249,14 +1253,14 @@ static int logi_dj_ll_parse(struct hid_device *hid)
 		return -ENOMEM;
 
 	if (djdev->reports_supported & STD_KEYBOARD) {
-		dbg_hid("%s: sending a kbd descriptor, reports_supported: %x\n",
+		dbg_hid("%s: sending a kbd descriptor, reports_supported: %llx\n",
 			__func__, djdev->reports_supported);
 		rdcat(rdesc, &rsize, kbd_descriptor, sizeof(kbd_descriptor));
 	}
 
 	if (djdev->reports_supported & STD_MOUSE) {
-		dbg_hid("%s: sending a mouse descriptor, reports_supported: "
-			"%x\n", __func__, djdev->reports_supported);
+		dbg_hid("%s: sending a mouse descriptor, reports_supported: %llx\n",
+			__func__, djdev->reports_supported);
 		if (djdev->dj_receiver_dev->type == recvr_type_gaming_hidpp)
 			rdcat(rdesc, &rsize, mse_high_res_descriptor,
 			      sizeof(mse_high_res_descriptor));
@@ -1269,29 +1273,32 @@ static int logi_dj_ll_parse(struct hid_device *hid)
 	}
 
 	if (djdev->reports_supported & MULTIMEDIA) {
-		dbg_hid("%s: sending a multimedia report descriptor: %x\n",
+		dbg_hid("%s: sending a multimedia report descriptor: %llx\n",
 			__func__, djdev->reports_supported);
 		rdcat(rdesc, &rsize, consumer_descriptor, sizeof(consumer_descriptor));
 	}
 
 	if (djdev->reports_supported & POWER_KEYS) {
-		dbg_hid("%s: sending a power keys report descriptor: %x\n",
+		dbg_hid("%s: sending a power keys report descriptor: %llx\n",
 			__func__, djdev->reports_supported);
 		rdcat(rdesc, &rsize, syscontrol_descriptor, sizeof(syscontrol_descriptor));
 	}
 
 	if (djdev->reports_supported & MEDIA_CENTER) {
-		dbg_hid("%s: sending a media center report descriptor: %x\n",
+		dbg_hid("%s: sending a media center report descriptor: %llx\n",
 			__func__, djdev->reports_supported);
 		rdcat(rdesc, &rsize, media_descriptor, sizeof(media_descriptor));
 	}
 
 	if (djdev->reports_supported & KBD_LEDS) {
-		dbg_hid("%s: need to send kbd leds report descriptor: %x\n",
+		dbg_hid("%s: need to send kbd leds report descriptor: %llx\n",
 			__func__, djdev->reports_supported);
 	}
 
-	rdcat(rdesc, &rsize, hidpp_descriptor, sizeof(hidpp_descriptor));
+	if (djdev->reports_supported & HIDPP) {
+		rdcat(rdesc, &rsize, hidpp_descriptor,
+		      sizeof(hidpp_descriptor));
+	}
 
 	retval = hid_parse_report(hid, rdesc, rsize);
 	kfree(rdesc);