ioctl USBTMC_IOCTL_WRITE_RESULT copies current out_transfer_size
to given __u32 pointer and returns current out_status of the last
(asnynchronous) USBTMC_IOCTL_WRITE call.
Signed-off-by: Guido Kiener <guido.kiener@xxxxxxxxxxxxxxxxx>
Reviewed-by: Steve Bayless <steve_bayless@xxxxxxxxxxxx>
---
drivers/usb/class/usbtmc.c | 25 +++++++++++++++++++++++++
include/uapi/linux/usb/tmc.h | 1 +
2 files changed, 26 insertions(+)
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index 0328f1beb32d..ea4e6f033c26 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -908,6 +908,26 @@ static ssize_t usbtmc_ioctl_generic_write(struct usbtmc_file_data *file_data,
return retval;
}
+/*
+ * Get the generic write result
+ */
+static ssize_t usbtmc_ioctl_write_result(struct usbtmc_file_data *file_data,
+ void __user *arg)
+{
+ u32 transferred;
+ int retval;
+
+ spin_lock_irq(&file_data->err_lock);
+ transferred = file_data->out_transfer_size;
+ retval = file_data->out_status;
+ spin_unlock_irq(&file_data->err_lock);
+
+ if (put_user(transferred, (__u32 __user *)arg))
+ return -EFAULT;
+
+ return retval;
+}
+
/*
* Sends a REQUEST_DEV_DEP_MSG_IN message on the Bulk-OUT endpoint.
* @transfer_size: number of bytes to request from the device.
@@ -1763,6 +1783,11 @@ static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
(void __user *)arg);
break;
+ case USBTMC_IOCTL_WRITE_RESULT:
+ retval = usbtmc_ioctl_write_result(file_data,
+ (void __user *)arg);
+ break;
+
case USBTMC488_IOCTL_GET_CAPS:
retval = copy_to_user((void __user *)arg,
&data->usb488_caps,
diff --git a/include/uapi/linux/usb/tmc.h b/include/uapi/linux/usb/tmc.h
index 56faeb3b5f0f..4a47b11e4a7e 100644
--- a/include/uapi/linux/usb/tmc.h
+++ b/include/uapi/linux/usb/tmc.h
@@ -86,6 +86,7 @@ struct usbtmc_message {
#define USBTMC_IOCTL_EOM_ENABLE _IOW(USBTMC_IOC_NR, 11, __u8)
#define USBTMC_IOCTL_CONFIG_TERMCHAR _IOW(USBTMC_IOC_NR, 12, struct usbtmc_termchar)
#define USBTMC_IOCTL_WRITE _IOWR(USBTMC_IOC_NR, 13, struct usbtmc_message)
+#define USBTMC_IOCTL_WRITE_RESULT _IOWR(USBTMC_IOC_NR, 15, __u32)
#define USBTMC488_IOCTL_GET_CAPS _IOR(USBTMC_IOC_NR, 17, unsigned char)
#define USBTMC488_IOCTL_READ_STB _IOR(USBTMC_IOC_NR, 18, unsigned char)
--
2.17.1
--
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