| Message ID | 20240502182804.145926-4-christoph.fritz@hexdev.de |
|---|---|
| State | New |
| Headers | show |
| Series | LIN Bus support for Linux | expand |
On Sat, 2024-05-04 at 18:00 +0200, Greg Kroah-Hartman wrote: > On Thu, May 02, 2024 at 08:27:56PM +0200, Christoph Fritz wrote: > > This patch introduces an additional receive buffer callback variation > > besides the already existing receive_buf(). This new callback function > > also passes the flag buffer (TTY_NORMAL, TTY_BREAK, and friends). > > > > If defined, this function gets prioritized and called instead of the > > standard receive_buf(). > > > > An alternative approach could have been to enhance the receive_buf() > > function and update all drivers that use it. > > Please, let's do that instead of adding random letters at the end of a > function pointer :) :) sure > > > Signed-off-by: Christoph Fritz <christoph.fritz@hexdev.de> > > --- > > drivers/tty/serdev/serdev-ttyport.c | 2 +- > > include/linux/serdev.h | 17 ++++++++++++++--- > > 2 files changed, 15 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c > > index 3d7ae7fa50186..bb47691afdb21 100644 > > --- a/drivers/tty/serdev/serdev-ttyport.c > > +++ b/drivers/tty/serdev/serdev-ttyport.c > > @@ -32,7 +32,7 @@ static size_t ttyport_receive_buf(struct tty_port *port, const u8 *cp, > > if (!test_bit(SERPORT_ACTIVE, &serport->flags)) > > return 0; > > > > - ret = serdev_controller_receive_buf(ctrl, cp, count); > > + ret = serdev_controller_receive_buf(ctrl, cp, fp, count); > > > > dev_WARN_ONCE(&ctrl->dev, ret > count, > > "receive_buf returns %zu (count = %zu)\n", > > diff --git a/include/linux/serdev.h b/include/linux/serdev.h > > index ff78efc1f60df..c6ef5a8988e07 100644 > > --- a/include/linux/serdev.h > > +++ b/include/linux/serdev.h > > @@ -23,11 +23,17 @@ struct serdev_device; > > * struct serdev_device_ops - Callback operations for a serdev device > > * @receive_buf: Function called with data received from device; > > * returns number of bytes accepted; may sleep. > > + * @receive_buf_fp: Function called with data and flag buffer received > > + * from device; If defined, this function gets called > > + * instead of @receive_buf; > > + * returns number of bytes accepted; may sleep. > > I don't remember waht "fp" means here, and you don't document it, so > let's just have one recieve_buf() callback please. OK, that is a great opportunity for me to use Coccinelle. In the upcoming revision v4 I'll add the "flag buffer pointer" treewide, then named "flags". thanks -- Christoph
diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c index 3d7ae7fa50186..bb47691afdb21 100644 --- a/drivers/tty/serdev/serdev-ttyport.c +++ b/drivers/tty/serdev/serdev-ttyport.c @@ -32,7 +32,7 @@ static size_t ttyport_receive_buf(struct tty_port *port, const u8 *cp, if (!test_bit(SERPORT_ACTIVE, &serport->flags)) return 0; - ret = serdev_controller_receive_buf(ctrl, cp, count); + ret = serdev_controller_receive_buf(ctrl, cp, fp, count); dev_WARN_ONCE(&ctrl->dev, ret > count, "receive_buf returns %zu (count = %zu)\n", diff --git a/include/linux/serdev.h b/include/linux/serdev.h index ff78efc1f60df..c6ef5a8988e07 100644 --- a/include/linux/serdev.h +++ b/include/linux/serdev.h @@ -23,11 +23,17 @@ struct serdev_device; * struct serdev_device_ops - Callback operations for a serdev device * @receive_buf: Function called with data received from device; * returns number of bytes accepted; may sleep. + * @receive_buf_fp: Function called with data and flag buffer received + * from device; If defined, this function gets called + * instead of @receive_buf; + * returns number of bytes accepted; may sleep. * @write_wakeup: Function called when ready to transmit more data; must * not sleep. */ struct serdev_device_ops { size_t (*receive_buf)(struct serdev_device *, const u8 *, size_t); + ssize_t (*receive_buf_fp)(struct serdev_device *, const u8 *, + const u8 *, size_t); void (*write_wakeup)(struct serdev_device *); }; @@ -186,15 +192,20 @@ static inline void serdev_controller_write_wakeup(struct serdev_controller *ctrl } static inline size_t serdev_controller_receive_buf(struct serdev_controller *ctrl, - const u8 *data, + const u8 *data, const u8 *fp, size_t count) { struct serdev_device *serdev = ctrl->serdev; - if (!serdev || !serdev->ops->receive_buf) + if (!serdev || !serdev->ops) return 0; - return serdev->ops->receive_buf(serdev, data, count); + if (serdev->ops->receive_buf_fp) + return serdev->ops->receive_buf_fp(serdev, data, fp, count); + else if (serdev->ops->receive_buf) + return serdev->ops->receive_buf(serdev, data, count); + + return 0; } #if IS_ENABLED(CONFIG_SERIAL_DEV_BUS)
This patch introduces an additional receive buffer callback variation besides the already existing receive_buf(). This new callback function also passes the flag buffer (TTY_NORMAL, TTY_BREAK, and friends). If defined, this function gets prioritized and called instead of the standard receive_buf(). An alternative approach could have been to enhance the receive_buf() function and update all drivers that use it. Signed-off-by: Christoph Fritz <christoph.fritz@hexdev.de> --- drivers/tty/serdev/serdev-ttyport.c | 2 +- include/linux/serdev.h | 17 ++++++++++++++--- 2 files changed, 15 insertions(+), 4 deletions(-)