Add ioctl USBTMC_IOCTL_AUTO_ABORT to configure auto_abort for
each specific file handle.
Signed-off-by: Guido Kiener <guido.kiener@xxxxxxxxxxxxxxxxx>
Reviewed-by: Steve Bayless <steve_bayless@xxxxxxxxxxxx>
---
drivers/usb/class/usbtmc.c | 23 ++++++++++++++++-------
include/uapi/linux/usb/tmc.h | 1 +
2 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index d659c083a19b..caadd2df13a9 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -136,6 +136,7 @@ struct usbtmc_file_data {
u8 eom_val;
u8 term_char;
bool term_char_enabled;
+ bool auto_abort;
spinlock_t err_lock; /* lock for errors */
@@ -216,6 +217,7 @@ static int usbtmc_open(struct inode *inode, struct file *filp)
file_data->timeout = USBTMC_TIMEOUT;
file_data->term_char = data->TermChar;
file_data->term_char_enabled = data->TermCharEnabled;
+ file_data->auto_abort = data->auto_abort;
file_data->eom_val = 1;
INIT_LIST_HEAD(&file_data->file_elem);
@@ -1391,7 +1393,7 @@ static ssize_t usbtmc_read(struct file *filp, char __user *buf,
retval = send_request_dev_dep_msg_in(file_data, count);
if (retval < 0) {
- if (data->auto_abort)
+ if (file_data->auto_abort)
usbtmc_ioctl_abort_bulk_out(data);
goto exit;
}
@@ -1416,7 +1418,7 @@ static ssize_t usbtmc_read(struct file *filp, char __user *buf,
if (retval < 0) {
dev_dbg(dev, "Unable to read data, error %d\n", retval);
- if (data->auto_abort)
+ if (file_data->auto_abort)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
@@ -1426,21 +1428,21 @@ static ssize_t usbtmc_read(struct file *filp, char __user *buf,
/* Sanity checks for the header */
if (actual < USBTMC_HEADER_SIZE) {
dev_err(dev, "Device sent too small first packet: %u < %u\n", actual, USBTMC_HEADER_SIZE);
- if (data->auto_abort)
+ if (file_data->auto_abort)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
if (buffer[0] != 2) {
dev_err(dev, "Device sent reply with wrong MsgID: %u != 2\n", buffer[0]);
- if (data->auto_abort)
+ if (file_data->auto_abort)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
if (buffer[1] != data->bTag_last_write) {
dev_err(dev, "Device sent reply with wrong bTag: %u != %u\n", buffer[1], data->bTag_last_write);
- if (data->auto_abort)
+ if (file_data->auto_abort)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
@@ -1455,7 +1457,7 @@ static ssize_t usbtmc_read(struct file *filp, char __user *buf,
if (n_characters > this_part) {
dev_err(dev, "Device wants to return more data than requested: %u > %zu\n", n_characters, count);
- if (data->auto_abort)
+ if (file_data->auto_abort)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
@@ -1597,7 +1599,7 @@ static ssize_t usbtmc_write(struct file *filp, const char __user *buf,
if (retval < 0) {
dev_err(&data->intf->dev,
"Unable to send data, error %d\n", retval);
- if (data->auto_abort)
+ if (file_data->auto_abort)
usbtmc_ioctl_abort_bulk_out(data);
goto exit;
}
@@ -2106,6 +2108,7 @@ static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
struct usbtmc_file_data *file_data;
struct usbtmc_device_data *data;
int retval = -EBADRQC;
+ __u8 tmp_byte;
file_data = file->private_data;
data = file_data->data;
@@ -2222,6 +2225,12 @@ static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
(__u8 __user *)arg);
break;
+ case USBTMC_IOCTL_AUTO_ABORT:
+ retval = get_user(tmp_byte, (unsigned char __user *)arg);
+ if (retval == 0)
+ file_data->auto_abort = !!tmp_byte;
+ 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 d2ed6a20de6b..2435694d3ba5 100644
--- a/include/uapi/linux/usb/tmc.h
+++ b/include/uapi/linux/usb/tmc.h
@@ -99,6 +99,7 @@ struct usbtmc_message {
#define USBTMC488_IOCTL_WAIT_SRQ _IOW(USBTMC_IOC_NR, 23, __u32)
#define USBTMC_IOCTL_MSG_IN_ATTR _IOR(USBTMC_IOC_NR, 24, __u8)
+#define USBTMC_IOCTL_AUTO_ABORT _IOW(USBTMC_IOC_NR, 25, __u8)
/* Cancel and cleanup asynchronous calls */
#define USBTMC_IOCTL_CANCEL_IO _IO(USBTMC_IOC_NR, 35)
--
2.17.1
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