5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dave Penkler dpenkler@gmail.com
[ Upstream commit c9784e23c1020e63d6dba5e10ca8bf3d8b85c19c ]
This new ioctl reads the status byte (STB) from the device and returns the STB unmodified to the application. The srq_asserted bit is not taken into account and not changed.
This ioctl is useful to support non USBTMC-488 compliant devices.
Tested-by: Jian-Wei Wu jian-wei_wu@keysight.com Reviewed-by: Guido Kiener guido.kiener@rohde-schwarz.com Signed-off-by: Dave Penkler dpenkler@gmail.com Link: https://lore.kernel.org/r/20201215155621.9592-3-dpenkler@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Stable-dep-of: acb3dac2805d ("usb: usbtmc: Fix read_stb function and get_stb ioctl") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/class/usbtmc.c | 6 ++++++ include/uapi/linux/usb/tmc.h | 2 ++ 2 files changed, 8 insertions(+)
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c index d47ec01d29778..738ef160109bf 100644 --- a/drivers/usb/class/usbtmc.c +++ b/drivers/usb/class/usbtmc.c @@ -2173,6 +2173,12 @@ static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) file_data->auto_abort = !!tmp_byte; break;
+ case USBTMC_IOCTL_GET_STB: + retval = usbtmc_get_stb(file_data, &tmp_byte); + if (retval > 0) + retval = put_user(tmp_byte, (__u8 __user *)arg); + break; + case USBTMC_IOCTL_CANCEL_IO: retval = usbtmc_ioctl_cancel_io(file_data); break; diff --git a/include/uapi/linux/usb/tmc.h b/include/uapi/linux/usb/tmc.h index fdd4d88a7b95d..1e7878fe591f4 100644 --- a/include/uapi/linux/usb/tmc.h +++ b/include/uapi/linux/usb/tmc.h @@ -102,6 +102,8 @@ struct usbtmc_message { #define USBTMC_IOCTL_MSG_IN_ATTR _IOR(USBTMC_IOC_NR, 24, __u8) #define USBTMC_IOCTL_AUTO_ABORT _IOW(USBTMC_IOC_NR, 25, __u8)
+#define USBTMC_IOCTL_GET_STB _IOR(USBTMC_IOC_NR, 26, __u8) + /* Cancel and cleanup asynchronous calls */ #define USBTMC_IOCTL_CANCEL_IO _IO(USBTMC_IOC_NR, 35) #define USBTMC_IOCTL_CLEANUP_IO _IO(USBTMC_IOC_NR, 36)