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

Sean Wang
2018-07-15T07:52:14Z

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@mediatek.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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