diff options
| author | Dave Platt <dplatt@radagast.org> | 2007-05-08 22:00:12 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-13 03:29:48 +0400 |
| commit | 45b844df5a4b17884b4e26e43bfc4802604e7cab (patch) | |
| tree | 624c48e4fc481cac8f16a2d00dce56e22f06a541 /drivers/usb/serial/mct_u232.h | |
| parent | 01cd08192040eab30f837f061ca07f43cf15f4a1 (diff) | |
| download | linux-45b844df5a4b17884b4e26e43bfc4802604e7cab.tar.xz | |
USB: RTS/CTS handshaking support, DTR fixes for MCT U232 serial adapter
Improvements and fixes to the MCT U232 USB/serial interface driver.
Implement RTS/CTS hardware flow control. Implement HUPCL. Bring
handling of DTR and RTS into conformance with other Linux serial
port drivers - assert both signals when opening device, even if
"crtscts" is not currently selected.
Signed-off-by: Dave Platt <dplatt@radagast.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/mct_u232.h')
| -rw-r--r-- | drivers/usb/serial/mct_u232.h | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/usb/serial/mct_u232.h b/drivers/usb/serial/mct_u232.h index 73dd0d984cd3..a61bac8f224a 100644 --- a/drivers/usb/serial/mct_u232.h +++ b/drivers/usb/serial/mct_u232.h @@ -63,14 +63,15 @@ #define MCT_U232_SET_UNKNOWN1_REQUEST 11 /* Unknown functionality */ #define MCT_U232_SET_UNKNOWN1_SIZE 1 -/* This USB device request code is not well understood. It is transmitted by - the MCT-supplied Windows driver whenever the baud rate changes. +/* This USB device request code appears to control whether CTS is required + during transmission. - Without this USB device request, the USB/RS-232 adapter will not write to - RS-232 devices which do not assert the 'CTS' signal. + Sending a zero byte allows data transmission to a device which is not + asserting CTS. Sending a '1' byte will cause transmission to be deferred + until the device asserts CTS. */ -#define MCT_U232_SET_UNKNOWN2_REQUEST 12 /* Unknown functionality */ -#define MCT_U232_SET_UNKNOWN2_SIZE 1 +#define MCT_U232_SET_CTS_REQUEST 12 +#define MCT_U232_SET_CTS_SIZE 1 /* * Baud rate (divisor) @@ -439,7 +440,7 @@ static int mct_u232_calculate_baud_rate(struct usb_serial *serial, int value); * which says "U232-P9" ;-) * * The circuit board inside the adaptor contains a Philips PDIUSBD12 - * USB endpoint chip and a Phillips P87C52UBAA microcontroller with + * USB endpoint chip and a Philips P87C52UBAA microcontroller with * embedded UART. Exhaustive documentation for these is available at: * * http://www.semiconductors.philips.com/pip/p87c52ubaa |