diff options
| author | Guido Kiener <guido@kiener-muenchen.de> | 2018-07-18 10:45:38 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-21 08:22:15 +0200 |
| commit | fbd83971f9429849dd3a105b663822d15b7b992b (patch) | |
| tree | f65e39e9f05462d7a7653489f86a356a18423597 /drivers/usb/class/usbtmc.c | |
| parent | fe78a7c637057070f20ac9460608a18d775e6349 (diff) | |
usb: usbtmc: Add ioctl for EOM bit
add USBTMC_IOCTL_EOM_ENABLE to specify EOM bit for next write()
call. Sets Bit 0 of field 'bmTransferAttributes' of DEV_DEP_MSG_OUT
Bulk-OUT Header.
Allows fine grained control over end of message handling on a
per file descriptor basis.
Reviewed-by: Steve Bayless <steve_bayless@keysight.com>
Tested-by: Dave Penkler <dpenkler@gmail.com>
Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Signed-off-by: Guido Kiener <guido.kiener@rohde-schwarz.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/class/usbtmc.c')
| -rw-r--r-- | drivers/usb/class/usbtmc.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c index 38fc7abdc00c..c77e0ac6260b 100644 --- a/drivers/usb/class/usbtmc.c +++ b/drivers/usb/class/usbtmc.c @@ -120,6 +120,7 @@ struct usbtmc_file_data { u32 timeout; u8 srq_byte; atomic_t srq_asserted; + u8 eom_val; }; /* Forward declarations */ @@ -157,6 +158,7 @@ static int usbtmc_open(struct inode *inode, struct file *filp) file_data->data = data; file_data->timeout = USBTMC_TIMEOUT; + file_data->eom_val = 1; INIT_LIST_HEAD(&file_data->file_elem); spin_lock_irq(&data->dev_lock); @@ -855,7 +857,7 @@ static ssize_t usbtmc_write(struct file *filp, const char __user *buf, buffer[8] = 0; } else { this_part = remaining; - buffer[8] = 1; + buffer[8] = file_data->eom_val; } /* Setup IO buffer for DEV_DEP_MSG_OUT message */ @@ -1277,6 +1279,25 @@ static int usbtmc_ioctl_set_timeout(struct usbtmc_file_data *file_data, return 0; } +/* + * enables/disables sending EOM on write + */ +static int usbtmc_ioctl_eom_enable(struct usbtmc_file_data *file_data, + void __user *arg) +{ + u8 eom_enable; + + if (copy_from_user(&eom_enable, arg, sizeof(eom_enable))) + return -EFAULT; + + if (eom_enable > 1) + return -EINVAL; + + file_data->eom_val = eom_enable; + + return 0; +} + static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct usbtmc_file_data *file_data; @@ -1327,6 +1348,11 @@ static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) (void __user *)arg); break; + case USBTMC_IOCTL_EOM_ENABLE: + retval = usbtmc_ioctl_eom_enable(file_data, + (void __user *)arg); + break; + case USBTMC488_IOCTL_GET_CAPS: retval = copy_to_user((void __user *)arg, &data->usb488_caps, |