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

Implement an ioctl to support the USMTMC-USB488 READ_STATUS_BYTE operation.

Browse Source 
Background:
When performing a read on an instrument that is executing a function
that runs longer than the USB timeout the instrument may hang and
require a device reset to recover. The READ_STATUS_BYTE operation
always returns even when the instrument is busy permitting to poll
for the appropriate condition. This capability is referred to in
instrument application notes on synchronizing acquisitions for other
platforms.

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dave Penkler
2016-01-27 19:09:24 +01:00
committed by Greg Kroah-Hartman
parent 21619792d1
commit dbf3e7f654
2 changed files with 203 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/uapi/linux/usb/tmc.h
View File

@@ -30,6 +30,7 @@
#define USBTMC_REQUEST_CHECK_CLEAR_STATUS 6
#define USBTMC_REQUEST_GET_CAPABILITIES 7
#define USBTMC_REQUEST_INDICATOR_PULSE 64
#define USBTMC488_REQUEST_READ_STATUS_BYTE 128
/* Request values for USBTMC driver's ioctl entry point */
#define USBTMC_IOC_NR 91
@@ -39,5 +40,6 @@
#define USBTMC_IOCTL_ABORT_BULK_IN _IO(USBTMC_IOC_NR, 4)
#define USBTMC_IOCTL_CLEAR_OUT_HALT _IO(USBTMC_IOC_NR, 6)
#define USBTMC_IOCTL_CLEAR_IN_HALT _IO(USBTMC_IOC_NR, 7)
#define USBTMC488_IOCTL_READ_STB _IOR(USBTMC_IOC_NR, 18, unsigned char)
#endif