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From:   Venkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>
To:     marcel@holtmann.org, johan.hedberg@gmail.com
Cc:     mka@chromium.org, linux-kernel@vger.kernel.org,
        linux-bluetooth@vger.kernel.org, hemantg@codeaurora.org,
        linux-arm-msm@vger.kernel.org, bgodavar@codeaurora.org,
        rjliao@codeaurora.org, hbandi@codeaurora.org,
        abhishekpandit@chromium.org,
        Venkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>
Subject: [PATCH v3] Bluetooth: hci_qca: Add support to read FW build version for WCN3991 BTSoC
Date:   Thu,  3 Dec 2020 17:50:01 +0530
Message-Id: <1606998001-17424-1-git-send-email-gubbaven@codeaurora.org>
Precedence: bulk

Add support to read FW build version from debugfs node.
This info can be read from
/sys/kernel/debug/bluetooth/hci0/ibs/fw_build_info

Signed-off-by: Venkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>
---
 drivers/bluetooth/btqca.c   | 48 +++++++++++++++++++++++++++++++++++++++++++++
 drivers/bluetooth/btqca.h   |  8 ++++++++
 drivers/bluetooth/hci_qca.c | 34 ++++++++++++++++++++++++++++++++
 3 files changed, 90 insertions(+)

diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
index f85a55a..660eea5 100644
--- a/drivers/bluetooth/btqca.c
+++ b/drivers/bluetooth/btqca.c
@@ -94,6 +94,54 @@ int qca_read_soc_version(struct hci_dev *hdev, struct qca_btsoc_version *ver,
 }
 EXPORT_SYMBOL_GPL(qca_read_soc_version);
 
+int qca_read_fw_build_info(struct hci_dev *hdev, u8 *fw_build)
+{
+	struct sk_buff *skb;
+	struct edl_event_hdr *edl;
+	char cmd;
+	int err = 0;
+	int build_lbl_len;
+
+	bt_dev_dbg(hdev, "QCA read fw build info");
+
+	cmd = EDL_GET_BUILD_INFO_CMD;
+	skb = __hci_cmd_sync_ev(hdev, EDL_PATCH_CMD_OPCODE, EDL_PATCH_CMD_LEN,
+				&cmd, 0, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		err = PTR_ERR(skb);
+		bt_dev_err(hdev, "Reading QCA fw build info failed (%d)",
+			   err);
+		return err;
+	}
+
+	edl = (struct edl_event_hdr *)(skb->data);
+	if (!edl) {
+		bt_dev_err(hdev, "QCA read fw build info with no header");
+		err = -EILSEQ;
+		goto out;
+	}
+
+	if (edl->cresp != EDL_CMD_REQ_RES_EVT ||
+	    edl->rtype != EDL_GET_BUILD_INFO_CMD) {
+		bt_dev_err(hdev, "QCA Wrong packet received %d %d", edl->cresp,
+			   edl->rtype);
+		err = -EIO;
+		goto out;
+	}
+
+	build_lbl_len = edl->data[0];
+	if (build_lbl_len <= QCA_FW_BUILD_VER_LEN - 2) {
+		memcpy(fw_build, &edl->data[1], build_lbl_len);
+		*(fw_build + build_lbl_len) = '\n';
+		*(fw_build + build_lbl_len + 1) = '\0';
+	}
+
+out:
+	kfree_skb(skb);
+	return err;
+}
+EXPORT_SYMBOL_GPL(qca_read_fw_build_info);
+
 static int qca_send_reset(struct hci_dev *hdev)
 {
 	struct sk_buff *skb;
diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
index e73b8f8..ac1b76a 100644
--- a/drivers/bluetooth/btqca.h
+++ b/drivers/bluetooth/btqca.h
@@ -11,6 +11,7 @@
 #define EDL_PATCH_CMD_LEN		(1)
 #define EDL_PATCH_VER_REQ_CMD		(0x19)
 #define EDL_PATCH_TLV_REQ_CMD		(0x1E)
+#define EDL_GET_BUILD_INFO_CMD		(0x20)
 #define EDL_NVM_ACCESS_SET_REQ_CMD	(0x01)
 #define MAX_SIZE_PER_TLV_SEGMENT	(243)
 #define QCA_PRE_SHUTDOWN_CMD		(0xFC08)
@@ -154,6 +155,7 @@ int qca_read_soc_version(struct hci_dev *hdev, struct qca_btsoc_version *ver,
 			 enum qca_btsoc_type);
 int qca_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr);
 int qca_send_pre_shutdown_cmd(struct hci_dev *hdev);
+int qca_read_fw_build_info(struct hci_dev *hdev, u8 *fw_build);
 static inline bool qca_is_wcn399x(enum qca_btsoc_type soc_type)
 {
 	return soc_type == QCA_WCN3990 || soc_type == QCA_WCN3991 ||
@@ -195,4 +197,10 @@ static inline int qca_send_pre_shutdown_cmd(struct hci_dev *hdev)
 {
 	return -EOPNOTSUPP;
 }
+
+static inline int qca_read_fw_build_info(struct hci_dev *hdev, u8 *fw_build)
+{
+	return -EOPNOTSUPP;
+}
+
 #endif
diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 4a96368..56616b0 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -180,6 +180,7 @@ struct qca_data {
 	u64 rx_votes_off;
 	u64 votes_on;
 	u64 votes_off;
+	u8 fw_build[QCA_FW_BUILD_VER_LEN];
 };
 
 enum qca_speed_type {
@@ -621,12 +622,33 @@ static int qca_open(struct hci_uart *hu)
 	return 0;
 }
 
+static ssize_t fw_build_read(struct file *file, char __user *user_buf,
+			     size_t count, loff_t *ppos)
+{
+	struct hci_dev *hdev = file->private_data;
+	struct hci_uart *hu = hci_get_drvdata(hdev);
+	struct qca_data *qca = hu->priv;
+	u8 length = 0;
+
+	length = strlen(qca->fw_build);
+
+	return simple_read_from_buffer(user_buf, count, ppos, qca->fw_build,
+				       length);
+}
+
+static const struct file_operations fw_build_fops = {
+	.open = simple_open,
+	.read = fw_build_read,
+};
+
 static void qca_debugfs_init(struct hci_dev *hdev)
 {
 	struct hci_uart *hu = hci_get_drvdata(hdev);
 	struct qca_data *qca = hu->priv;
 	struct dentry *ibs_dir;
 	umode_t mode;
+	enum qca_btsoc_type soc_type = qca_soc_type(hu);
+	int ret;
 
 	if (!hdev->debugfs)
 		return;
@@ -659,12 +681,24 @@ static void qca_debugfs_init(struct hci_dev *hdev)
 	debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
 	debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
 	debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
+	if (soc_type == QCA_WCN3991) {
+		debugfs_create_file("fw_build_info", mode, ibs_dir, hdev,
+				    &fw_build_fops);
+	}
 
 	/* read/write */
 	mode = 0644;
 	debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
 	debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
 			   &qca->tx_idle_delay);
+
+	if (soc_type == QCA_WCN3991) {
+		/* get fw build info and log into debugfs fw_build_info */
+		ret = qca_read_fw_build_info(hdev, qca->fw_build);
+		if (ret < 0)
+			bt_dev_err(hdev, "QCA read fw build info failed (%d)",
+				   ret);
+	}
 }
 
 /* Flush protocol data */
-- 
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