linux-kernel - Re: [PATCH v5 5/7] Bluetooth: Extend btuart driver for join more vendor devices

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Date:   Sun, 15 Jul 2018 15:52:14 +0800
From:   Sean Wang <sean.wang@...iatek.com>
To:     Marcel Holtmann <marcel@...tmann.org>
CC:     <mark.rutland@....com>, <devicetree@...r.kernel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        <linux-kernel@...r.kernel.org>, <linux-bluetooth@...r.kernel.org>,
        <robh+dt@...nel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 5/7] Bluetooth: Extend btuart driver for join more
 vendor devices

On Sat, 2018-07-14 at 18:44 +0200, Marcel Holtmann wrote:
> Hi Sean,
> 
> > Adding an independent btuart.h header allows these essential definitions
> > can be reused in vendor driver. Also, struct btuart_vnd is extended with
> > additional callbacks such as .init initializing vendor data, .shtudown,
> > .recv and .send supporting SoC specific framing for that btuart can
> > simply adapt to various Bluetooth uart-based devices.
> > 
> > Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> > ---
> > drivers/bluetooth/btuart.c | 73 ++++++++++++++++++++++++----------------------
> > drivers/bluetooth/btuart.h | 30 +++++++++++++++++++
> > 2 files changed, 68 insertions(+), 35 deletions(-)
> > create mode 100644 drivers/bluetooth/btuart.h
> > 
> > diff --git a/drivers/bluetooth/btuart.c b/drivers/bluetooth/btuart.c
> > index a900aac..65d0086 100644
> > --- a/drivers/bluetooth/btuart.c
> > +++ b/drivers/bluetooth/btuart.c
> > @@ -33,35 +33,11 @@
> > #include <net/bluetooth/hci_core.h>
> > 
> > #include "h4_recv.h"
> > +#include "btuart.h"
> > #include "btbcm.h"
> > 
> > #define VERSION "1.0"
> > 
> > -struct btuart_vnd {
> > -	const struct h4_recv_pkt *recv_pkts;
> > -	int recv_pkts_cnt;
> > -	unsigned int manufacturer;
> > -	int (*open)(struct hci_dev *hdev);
> > -	int (*close)(struct hci_dev *hdev);
> > -	int (*setup)(struct hci_dev *hdev);
> > -};
> > -
> > -struct btuart_dev {
> > -	struct hci_dev *hdev;
> > -	struct serdev_device *serdev;
> > -
> > -	struct work_struct tx_work;
> > -	unsigned long tx_state;
> > -	struct sk_buff_head txq;
> > -
> > -	struct sk_buff *rx_skb;
> > -
> > -	const struct btuart_vnd *vnd;
> > -};
> 
> I really like to avoid this since it is not clean. Frankly I prefer to keep the btuart.c driver for drivers that really just use H:4 as transport protocol. If the protocol is only H:4 alike and has extra headers, then it should be a separate driver.
> 

thanks for letting me know your concern. I think I'm a little over in reusing these existing methods and break something generic and its beauty.

I'll make the driver be a separate one based on btuart in the next version.

> The common H:4 handling is abstracted in h4_recv.h already anyway and we can add more pieces if needed. However I also wonder since you have extra framing that the complex H:4 state keeping might be not needed at all. So it could be simplified.
> 

okay, I will get rid of h4_recv.h and consider to use more simplified logic to handle the extra framing and its payload.

> Regards
> 
> Marcel

> 
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