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| author | hselasky <hselasky@FreeBSD.org> | 2012-11-05 17:50:40 +0000 |
|---|---|---|
| committer | hselasky <hselasky@FreeBSD.org> | 2012-11-05 17:50:40 +0000 |
| commit | 8f55c564c22c381a460d71fc0d84fb5a4d4f1cfa (patch) | |
| tree | 545e1ebf2a8b93e0faf72bb68c2c54ef4f93b3ec /sys/dev/usb/serial/usb_serial.h | |
| parent | 404fbc7a9219f08d41afeee692d44e058a1956ba (diff) | |
| download | FreeBSD-src-8f55c564c22c381a460d71fc0d84fb5a4d4f1cfa.zip FreeBSD-src-8f55c564c22c381a460d71fc0d84fb5a4d4f1cfa.tar.gz | |
Add a jitter buffer in the common USB serial driver code which
temporarily stores characters if the TTY buffer is full when
used a as a console. This can happen when a console is suspended.
Also properly do the flow stop signalling when this happens and
flow start when the condition changes back to normal again.
Bump __FreeBSD_version to force external kernel modules
to be recompiled. No kernel API changes.
MFC after: 1 week
Suggested by: ed @
Diffstat (limited to 'sys/dev/usb/serial/usb_serial.h')
| -rw-r--r-- | sys/dev/usb/serial/usb_serial.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/dev/usb/serial/usb_serial.h b/sys/dev/usb/serial/usb_serial.h index 7d72adf..d045fbe 100644 --- a/sys/dev/usb/serial/usb_serial.h +++ b/sys/dev/usb/serial/usb_serial.h @@ -78,6 +78,7 @@ #define UCOM_MINVER 1 #define UCOM_PREFVER UCOM_MODVER #define UCOM_MAXVER 1 +#define UCOM_JITTERBUF_SIZE 128 /* bytes */ struct usb_device; struct ucom_softc; @@ -169,6 +170,8 @@ struct ucom_softc { struct mtx *sc_mtx; void *sc_parent; int sc_subunit; + uint16_t sc_jitterbuf_in; + uint16_t sc_jitterbuf_out; uint16_t sc_portno; uint16_t sc_flag; #define UCOM_FLAG_RTS_IFLOW 0x01 /* use RTS input flow control */ @@ -191,6 +194,7 @@ struct ucom_softc { #define UCOM_LS_RTS 0x02 #define UCOM_LS_BREAK 0x04 #define UCOM_LS_RING 0x08 + uint8_t sc_jitterbuf[UCOM_JITTERBUF_SIZE]; }; #define UCOM_MTX_ASSERT(sc, what) mtx_assert((sc)->sc_mtx, what) |
