linux-kernel - Re: [PATCH v1] Bluetooth: hci_qca: Add helper to set device address.

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Message-ID: <20181026185314.GD22824@google.com>
Date:   Fri, 26 Oct 2018 11:53:14 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Balakrishna Godavarthi <bgodavar@...eaurora.org>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        hemantg@...eaurora.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v1] Bluetooth: hci_qca: Add helper to set device address.

On Fri, Oct 26, 2018 at 07:34:50PM +0530, Balakrishna Godavarthi wrote:
> This patch add qca_set_device_bdaddr() to set the device
> address for latest Qualcomm Bluetooth chipset wcn3990 and above.
> 
> Signed-off-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
> ---
>  drivers/bluetooth/btqca.c   | 21 +++++++++++++++++++++
>  drivers/bluetooth/btqca.h   |  9 ++++++++-
>  drivers/bluetooth/hci_qca.c |  5 ++++-
>  3 files changed, 33 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
> index ec9e03a6b778..132dc6ceb174 100644
> --- a/drivers/bluetooth/btqca.c
> +++ b/drivers/bluetooth/btqca.c
> @@ -391,6 +391,27 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>  }
>  EXPORT_SYMBOL_GPL(qca_uart_setup);
>  
> +int qca_set_device_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)

nit: just qca_set_bdaddr() ? That would be consistent with
qca_set_bdaddr_rome() and ->set_bdaddr().

> +{
> +	struct sk_buff *skb;
> +	u8 cmd[6];

nit: this doesn't really contain the command (which is
EDL_WRITE_BD_ADDR_OPCODE). Name it 'buf', 'ba' or similar?

re-nit: in the memcpy below 'sizeof(bdaddr_t)' is used, do the same in
the declaration?

> +	int err;
> +
> +	memcpy(cmd, bdaddr, sizeof(bdaddr_t));
> +	skb = __hci_cmd_sync_ev(hdev, EDL_WRITE_BD_ADDR_OPCODE, sizeof(cmd),
> +				cmd, HCI_EV_VENDOR, HCI_INIT_TIMEOUT);
> +	if (IS_ERR(skb)) {
> +		err = PTR_ERR(skb);
> +		bt_dev_err(hdev, "QCA Change address cmd failed (%d)", err);
> +		return err;
> +	}
> +
> +	kfree_skb(skb);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(qca_set_device_bdaddr);
> +
>  MODULE_AUTHOR("Ben Young Tae Kim <ytkim@....qualcomm.com>");
>  MODULE_DESCRIPTION("Bluetooth support for Qualcomm Atheros family ver " VERSION);
>  MODULE_VERSION(VERSION);
> diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
> index 0c01f375fe83..8771fc2b193d 100644
> --- a/drivers/bluetooth/btqca.h
> +++ b/drivers/bluetooth/btqca.h
> @@ -20,6 +20,7 @@
>  
>  #define EDL_PATCH_CMD_OPCODE		(0xFC00)
>  #define EDL_NVM_ACCESS_OPCODE		(0xFC0B)
> +#define EDL_WRITE_BD_ADDR_OPCODE	(0xFC14)
>  #define EDL_PATCH_CMD_LEN		(1)
>  #define EDL_PATCH_VER_REQ_CMD		(0x19)
>  #define EDL_PATCH_TLV_REQ_CMD		(0x1E)
> @@ -140,7 +141,7 @@ int qca_set_bdaddr_rome(struct hci_dev *hdev, const bdaddr_t *bdaddr);
>  int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>  		   enum qca_btsoc_type soc_type, u32 soc_ver);
>  int qca_read_soc_version(struct hci_dev *hdev, u32 *soc_version);
> -
> +int qca_set_device_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr);
>  #else
>  
>  static inline int qca_set_bdaddr_rome(struct hci_dev *hdev, const bdaddr_t *bdaddr)
> @@ -159,4 +160,10 @@ static inline int qca_read_soc_version(struct hci_dev *hdev, u32 *soc_version)
>  	return -EOPNOTSUPP;
>  }
>  
> +static inline int qca_set_device_bdaddr(struct hci_dev *hdev,
> +					const bdaddr_t *bdaddr)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
>  #endif
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index f036c8f98ea3..f18d9f5a7782 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -1241,7 +1241,10 @@ static int qca_setup(struct hci_uart *hu)
>  	}
>  
>  	/* Setup bdaddr */
> -	hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
> +	if (qcadev->btsoc_type == QCA_WCN3990)
> +		hu->hdev->set_bdaddr = qca_set_device_bdaddr;
> +	else
> +		hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
>  
>  	return ret;
>  }

Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
Tested-by: Matthias Kaehlcke <mka@...omium.org>