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Date:   Tue, 08 Dec 2020 17:19:31 +0530
From:   gubbaven@codeaurora.org
To:     Marcel Holtmann <marcel@holtmann.org>
Cc:     Johan Hedberg <johan.hedberg@gmail.com>,
        Matthias Kaehlcke <mka@chromium.org>,
        LKML <linux-kernel@vger.kernel.org>,
        BlueZ development <linux-bluetooth@vger.kernel.org>,
        Hemantg <hemantg@codeaurora.org>,
        MSM <linux-arm-msm@vger.kernel.org>,
        Balakrishna Godavarthi <bgodavar@codeaurora.org>,
        Rocky Liao <rjliao@codeaurora.org>, hbandi@codeaurora.org,
        abhishekpandit@chromium.org
Subject: Re: [PATCH v3] Bluetooth: hci_qca: Add support to read FW build
 version for WCN3991 BTSoC
In-Reply-To: <AD0B5336-49BA-49D2-90DB-1D18A74C2883@holtmann.org>
References: <1606998001-17424-1-git-send-email-gubbaven@codeaurora.org>
 <AD0B5336-49BA-49D2-90DB-1D18A74C2883@holtmann.org>
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Hi Marcel,

On 2020-12-03 19:28, Marcel Holtmann wrote:
> Hi Venkata,
> 
>> 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);
>> +	}
> 
> what is wrong with using hci_set_fw_info?
[Venkata] :
Sure.I will use hci_set_fw_info.I will update this in next patch.
> 
> Regards
> 
> Marcel