xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

USB: RTS/CTS handshaking support, DTR fixes for MCT U232 serial adapter

Browse Source 
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>
This commit is contained in:
Dave Platt
2007-05-08 11:00:12 -07:00
committed by Greg Kroah-Hartman
parent 01cd081920
commit 45b844df5a
2 changed files with 106 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/usb/serial/mct_u232.h
View File

@@ -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