[PATCH 3/3] Bluetooth: btmtk: Replace magic numbers with WMT packet flag enum

[Chris Lu <chris.lu@mediatek.com>]

The flag field of a BTMTK_WMT_PATCH_DWNLD packet tells the device where
the packet sits in the download sequence, but both download loops write
the bare values 1, 2 and 3, so the reader has to infer the meaning from
the surrounding conditionals.

Add enum btmtk_wmt_pkt_flag and use it in btmtk_setup_firmware_79xx()
and btmtk_setup_firmware(). No functional change.

The other bare flag values in this driver belong to different WMT
opcodes (BTMTK_WMT_FUNC_CTRL, BTMTK_WMT_RST, BTMTK_WMT_SEMAPHORE and so
on), where the field means something else entirely, so they are left
alone.

Signed-off-by: Chris Lu <chris.lu@mediatek.com>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Assisted-by: Claude:claude-opus-5
---
 drivers/bluetooth/btmtk.c | 12 ++++++------
 drivers/bluetooth/btmtk.h |  9 +++++++++
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/bluetooth/btmtk.c b/drivers/bluetooth/btmtk.c
index cf4f40349afa..660ed5b02841 100644
--- a/drivers/bluetooth/btmtk.c
+++ b/drivers/bluetooth/btmtk.c
@@ -300,12 +300,12 @@ int btmtk_setup_firmware_79xx(struct hci_dev *hdev, const char *fwname,
 			while (dl_size > 0) {
 				dlen = min_t(int, 250, dl_size);
 				if (first_block == 1) {
-					flag = 1;
+					flag = BTMTK_WMT_PKT_START;
 					first_block = 0;
 				} else if (dl_size - dlen <= 0) {
-					flag = 3;
+					flag = BTMTK_WMT_PKT_END;
 				} else {
-					flag = 2;
+					flag = BTMTK_WMT_PKT_CONTINUE;
 				}
 
 				wmt_params.flag = flag;
@@ -384,7 +384,7 @@ int btmtk_setup_firmware(struct hci_dev *hdev, const char *fwname,
 
 	fw_size -= 30;
 	fw_ptr += 30;
-	flag = 1;
+	flag = BTMTK_WMT_PKT_START;
 
 	wmt_params.op = BTMTK_WMT_PATCH_DWNLD;
 	wmt_params.status = NULL;
@@ -394,9 +394,9 @@ int btmtk_setup_firmware(struct hci_dev *hdev, const char *fwname,
 
 		/* Tell device the position in sequence */
 		if (fw_size - dlen <= 0)
-			flag = 3;
+			flag = BTMTK_WMT_PKT_END;
 		else if (fw_size < fw->size - 30)
-			flag = 2;
+			flag = BTMTK_WMT_PKT_CONTINUE;
 
 		wmt_params.flag = flag;
 		wmt_params.dlen = dlen;
diff --git a/drivers/bluetooth/btmtk.h b/drivers/bluetooth/btmtk.h
index bc26148ec544..e8ad281a93a0 100644
--- a/drivers/bluetooth/btmtk.h
+++ b/drivers/bluetooth/btmtk.h
@@ -67,6 +67,15 @@ enum {
 	BTMTK_WMT_ON_PROGRESS,
 };
 
+/* Position of a BTMTK_WMT_PATCH_DWNLD packet within a download sequence,
+ * carried in struct btmtk_wmt_hdr's flag field.
+ */
+enum btmtk_wmt_pkt_flag {
+	BTMTK_WMT_PKT_START = 1,
+	BTMTK_WMT_PKT_CONTINUE = 2,
+	BTMTK_WMT_PKT_END = 3,
+};
+
 struct btmtk_wmt_hdr {
 	u8	dir;
 	u8	op;
-- 
2.45.2