Commit fbd83971 authored by Guido Kiener's avatar Guido Kiener Committed by Greg Kroah-Hartman
Browse files

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: default avatarSteve Bayless <steve_bayless@keysight.com>
Tested-by: default avatarDave Penkler <dpenkler@gmail.com>
Signed-off-by: default avatarDave Penkler <dpenkler@gmail.com>
Signed-off-by: default avatarGuido Kiener <guido.kiener@rohde-schwarz.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent fe78a7c6

drivers/usb/class/usbtmc.c

+27 −1
Original line number Diff line number Diff line
@@ -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,

include/uapi/linux/usb/tmc.h

+2 −0
Original line number Diff line number Diff line
@@ -50,6 +50,8 @@ 
#define USBTMC_IOCTL_CLEAR_IN_HALT	_IO(USBTMC_IOC_NR, 7)

#define USBTMC_IOCTL_GET_TIMEOUT	_IOR(USBTMC_IOC_NR, 9, __u32)

#define USBTMC_IOCTL_SET_TIMEOUT	_IOW(USBTMC_IOC_NR, 10, __u32)

#define USBTMC_IOCTL_EOM_ENABLE	        _IOW(USBTMC_IOC_NR, 11, __u8)



#define USBTMC488_IOCTL_GET_CAPS	_IOR(USBTMC_IOC_NR, 17, unsigned char)

#define USBTMC488_IOCTL_READ_STB	_IOR(USBTMC_IOC_NR, 18, unsigned char)

#define USBTMC488_IOCTL_REN_CONTROL	_IOW(USBTMC_IOC_NR, 19, unsigned char)

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