![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Steve Holland pointed out that we forgot to call break; in the switch statment. This probably resolves a lot of the bug reports I've gotten for the driver lately. Stupid me... Reported-by: Steve Holland <sdh4@iastate.edu> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1094 lines
26 KiB
C
1094 lines
26 KiB
C
/**
|
|
* drivers/usb/class/usbtmc.c - USB Test & Measurment class driver
|
|
*
|
|
* Copyright (C) 2007 Stefan Kopp, Gechingen, Germany
|
|
* Copyright (C) 2008 Novell, Inc.
|
|
* Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* The GNU General Public License is available at
|
|
* http://www.gnu.org/copyleft/gpl.html.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/kref.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/tmc.h>
|
|
|
|
|
|
#define USBTMC_MINOR_BASE 176
|
|
|
|
/*
|
|
* Size of driver internal IO buffer. Must be multiple of 4 and at least as
|
|
* large as wMaxPacketSize (which is usually 512 bytes).
|
|
*/
|
|
#define USBTMC_SIZE_IOBUFFER 2048
|
|
|
|
/* Default USB timeout (in milliseconds) */
|
|
#define USBTMC_TIMEOUT 10
|
|
|
|
/*
|
|
* Maximum number of read cycles to empty bulk in endpoint during CLEAR and
|
|
* ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short
|
|
* packet is never read.
|
|
*/
|
|
#define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100
|
|
|
|
static struct usb_device_id usbtmc_devices[] = {
|
|
{ USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), },
|
|
{ USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), },
|
|
{ 0, } /* terminating entry */
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, usbtmc_devices);
|
|
|
|
/*
|
|
* This structure is the capabilities for the device
|
|
* See section 4.2.1.8 of the USBTMC specification for details.
|
|
*/
|
|
struct usbtmc_dev_capabilities {
|
|
__u8 interface_capabilities;
|
|
__u8 device_capabilities;
|
|
__u8 usb488_interface_capabilities;
|
|
__u8 usb488_device_capabilities;
|
|
};
|
|
|
|
/* This structure holds private data for each USBTMC device. One copy is
|
|
* allocated for each USBTMC device in the driver's probe function.
|
|
*/
|
|
struct usbtmc_device_data {
|
|
const struct usb_device_id *id;
|
|
struct usb_device *usb_dev;
|
|
struct usb_interface *intf;
|
|
|
|
unsigned int bulk_in;
|
|
unsigned int bulk_out;
|
|
|
|
u8 bTag;
|
|
u8 bTag_last_write; /* needed for abort */
|
|
u8 bTag_last_read; /* needed for abort */
|
|
|
|
/* attributes from the USB TMC spec for this device */
|
|
u8 TermChar;
|
|
bool TermCharEnabled;
|
|
bool auto_abort;
|
|
|
|
struct usbtmc_dev_capabilities capabilities;
|
|
struct kref kref;
|
|
struct mutex io_mutex; /* only one i/o function running at a time */
|
|
};
|
|
#define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
|
|
|
|
/* Forward declarations */
|
|
static struct usb_driver usbtmc_driver;
|
|
|
|
static void usbtmc_delete(struct kref *kref)
|
|
{
|
|
struct usbtmc_device_data *data = to_usbtmc_data(kref);
|
|
|
|
usb_put_dev(data->usb_dev);
|
|
kfree(data);
|
|
}
|
|
|
|
static int usbtmc_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct usb_interface *intf;
|
|
struct usbtmc_device_data *data;
|
|
int retval = 0;
|
|
|
|
intf = usb_find_interface(&usbtmc_driver, iminor(inode));
|
|
if (!intf) {
|
|
printk(KERN_ERR KBUILD_MODNAME
|
|
": can not find device for minor %d", iminor(inode));
|
|
retval = -ENODEV;
|
|
goto exit;
|
|
}
|
|
|
|
data = usb_get_intfdata(intf);
|
|
kref_get(&data->kref);
|
|
|
|
/* Store pointer in file structure's private data field */
|
|
filp->private_data = data;
|
|
|
|
exit:
|
|
return retval;
|
|
}
|
|
|
|
static int usbtmc_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct usbtmc_device_data *data = file->private_data;
|
|
|
|
kref_put(&data->kref, usbtmc_delete);
|
|
return 0;
|
|
}
|
|
|
|
static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data)
|
|
{
|
|
u8 *buffer;
|
|
struct device *dev;
|
|
int rv;
|
|
int n;
|
|
int actual;
|
|
struct usb_host_interface *current_setting;
|
|
int max_size;
|
|
|
|
dev = &data->intf->dev;
|
|
buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_rcvctrlpipe(data->usb_dev, 0),
|
|
USBTMC_REQUEST_INITIATE_ABORT_BULK_IN,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
|
|
data->bTag_last_read, data->bulk_in,
|
|
buffer, 2, USBTMC_TIMEOUT);
|
|
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
|
|
|
|
if (buffer[0] == USBTMC_STATUS_FAILED) {
|
|
rv = 0;
|
|
goto exit;
|
|
}
|
|
|
|
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
|
|
dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n",
|
|
buffer[0]);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
max_size = 0;
|
|
current_setting = data->intf->cur_altsetting;
|
|
for (n = 0; n < current_setting->desc.bNumEndpoints; n++)
|
|
if (current_setting->endpoint[n].desc.bEndpointAddress ==
|
|
data->bulk_in)
|
|
max_size = le16_to_cpu(current_setting->endpoint[n].
|
|
desc.wMaxPacketSize);
|
|
|
|
if (max_size == 0) {
|
|
dev_err(dev, "Couldn't get wMaxPacketSize\n");
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size);
|
|
|
|
n = 0;
|
|
|
|
do {
|
|
dev_dbg(dev, "Reading from bulk in EP\n");
|
|
|
|
rv = usb_bulk_msg(data->usb_dev,
|
|
usb_rcvbulkpipe(data->usb_dev,
|
|
data->bulk_in),
|
|
buffer, USBTMC_SIZE_IOBUFFER,
|
|
&actual, USBTMC_TIMEOUT);
|
|
|
|
n++;
|
|
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_bulk_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
} while ((actual == max_size) &&
|
|
(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
|
|
|
|
if (actual == max_size) {
|
|
dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
|
|
USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
n = 0;
|
|
|
|
usbtmc_abort_bulk_in_status:
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_rcvctrlpipe(data->usb_dev, 0),
|
|
USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
|
|
0, data->bulk_in, buffer, 0x08,
|
|
USBTMC_TIMEOUT);
|
|
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
|
|
|
|
if (buffer[0] == USBTMC_STATUS_SUCCESS) {
|
|
rv = 0;
|
|
goto exit;
|
|
}
|
|
|
|
if (buffer[0] != USBTMC_STATUS_PENDING) {
|
|
dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
if (buffer[1] == 1)
|
|
do {
|
|
dev_dbg(dev, "Reading from bulk in EP\n");
|
|
|
|
rv = usb_bulk_msg(data->usb_dev,
|
|
usb_rcvbulkpipe(data->usb_dev,
|
|
data->bulk_in),
|
|
buffer, USBTMC_SIZE_IOBUFFER,
|
|
&actual, USBTMC_TIMEOUT);
|
|
|
|
n++;
|
|
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_bulk_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
} while ((actual = max_size) &&
|
|
(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
|
|
|
|
if (actual == max_size) {
|
|
dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
|
|
USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
goto usbtmc_abort_bulk_in_status;
|
|
|
|
exit:
|
|
kfree(buffer);
|
|
return rv;
|
|
|
|
}
|
|
|
|
static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data)
|
|
{
|
|
struct device *dev;
|
|
u8 *buffer;
|
|
int rv;
|
|
int n;
|
|
|
|
dev = &data->intf->dev;
|
|
|
|
buffer = kmalloc(8, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_rcvctrlpipe(data->usb_dev, 0),
|
|
USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
|
|
data->bTag_last_write, data->bulk_out,
|
|
buffer, 2, USBTMC_TIMEOUT);
|
|
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]);
|
|
|
|
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
|
|
dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n",
|
|
buffer[0]);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
n = 0;
|
|
|
|
usbtmc_abort_bulk_out_check_status:
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_rcvctrlpipe(data->usb_dev, 0),
|
|
USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
|
|
0, data->bulk_out, buffer, 0x08,
|
|
USBTMC_TIMEOUT);
|
|
n++;
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]);
|
|
|
|
if (buffer[0] == USBTMC_STATUS_SUCCESS)
|
|
goto usbtmc_abort_bulk_out_clear_halt;
|
|
|
|
if ((buffer[0] == USBTMC_STATUS_PENDING) &&
|
|
(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN))
|
|
goto usbtmc_abort_bulk_out_check_status;
|
|
|
|
rv = -EPERM;
|
|
goto exit;
|
|
|
|
usbtmc_abort_bulk_out_clear_halt:
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_sndctrlpipe(data->usb_dev, 0),
|
|
USB_REQ_CLEAR_FEATURE,
|
|
USB_DIR_OUT | USB_TYPE_STANDARD |
|
|
USB_RECIP_ENDPOINT,
|
|
USB_ENDPOINT_HALT, data->bulk_out, buffer,
|
|
0, USBTMC_TIMEOUT);
|
|
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
rv = 0;
|
|
|
|
exit:
|
|
kfree(buffer);
|
|
return rv;
|
|
}
|
|
|
|
static ssize_t usbtmc_read(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *f_pos)
|
|
{
|
|
struct usbtmc_device_data *data;
|
|
struct device *dev;
|
|
unsigned long int n_characters;
|
|
u8 *buffer;
|
|
int actual;
|
|
int done;
|
|
int remaining;
|
|
int retval;
|
|
int this_part;
|
|
|
|
/* Get pointer to private data structure */
|
|
data = filp->private_data;
|
|
dev = &data->intf->dev;
|
|
|
|
buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&data->io_mutex);
|
|
|
|
remaining = count;
|
|
done = 0;
|
|
|
|
while (remaining > 0) {
|
|
if (remaining > USBTMC_SIZE_IOBUFFER - 12 - 3)
|
|
this_part = USBTMC_SIZE_IOBUFFER - 12 - 3;
|
|
else
|
|
this_part = remaining;
|
|
|
|
/* Setup IO buffer for DEV_DEP_MSG_IN message
|
|
* Refer to class specs for details
|
|
*/
|
|
buffer[0] = 2;
|
|
buffer[1] = data->bTag;
|
|
buffer[2] = ~(data->bTag);
|
|
buffer[3] = 0; /* Reserved */
|
|
buffer[4] = (this_part - 12 - 3) & 255;
|
|
buffer[5] = ((this_part - 12 - 3) >> 8) & 255;
|
|
buffer[6] = ((this_part - 12 - 3) >> 16) & 255;
|
|
buffer[7] = ((this_part - 12 - 3) >> 24) & 255;
|
|
buffer[8] = data->TermCharEnabled * 2;
|
|
/* Use term character? */
|
|
buffer[9] = data->TermChar;
|
|
buffer[10] = 0; /* Reserved */
|
|
buffer[11] = 0; /* Reserved */
|
|
|
|
/* Send bulk URB */
|
|
retval = usb_bulk_msg(data->usb_dev,
|
|
usb_sndbulkpipe(data->usb_dev,
|
|
data->bulk_out),
|
|
buffer, 12, &actual, USBTMC_TIMEOUT);
|
|
|
|
/* Store bTag (in case we need to abort) */
|
|
data->bTag_last_write = data->bTag;
|
|
|
|
/* Increment bTag -- and increment again if zero */
|
|
data->bTag++;
|
|
if (!data->bTag)
|
|
(data->bTag)++;
|
|
|
|
if (retval < 0) {
|
|
dev_err(dev, "usb_bulk_msg returned %d\n", retval);
|
|
if (data->auto_abort)
|
|
usbtmc_ioctl_abort_bulk_out(data);
|
|
goto exit;
|
|
}
|
|
|
|
/* Send bulk URB */
|
|
retval = usb_bulk_msg(data->usb_dev,
|
|
usb_rcvbulkpipe(data->usb_dev,
|
|
data->bulk_in),
|
|
buffer, USBTMC_SIZE_IOBUFFER, &actual,
|
|
USBTMC_TIMEOUT);
|
|
|
|
/* Store bTag (in case we need to abort) */
|
|
data->bTag_last_read = data->bTag;
|
|
|
|
if (retval < 0) {
|
|
dev_err(dev, "Unable to read data, error %d\n", retval);
|
|
if (data->auto_abort)
|
|
usbtmc_ioctl_abort_bulk_in(data);
|
|
goto exit;
|
|
}
|
|
|
|
/* How many characters did the instrument send? */
|
|
n_characters = buffer[4] +
|
|
(buffer[5] << 8) +
|
|
(buffer[6] << 16) +
|
|
(buffer[7] << 24);
|
|
|
|
/* Copy buffer to user space */
|
|
if (copy_to_user(buf + done, &buffer[12], n_characters)) {
|
|
/* There must have been an addressing problem */
|
|
retval = -EFAULT;
|
|
goto exit;
|
|
}
|
|
|
|
done += n_characters;
|
|
if (n_characters < USBTMC_SIZE_IOBUFFER)
|
|
remaining = 0;
|
|
}
|
|
|
|
/* Update file position value */
|
|
*f_pos = *f_pos + done;
|
|
retval = done;
|
|
|
|
exit:
|
|
mutex_unlock(&data->io_mutex);
|
|
kfree(buffer);
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t usbtmc_write(struct file *filp, const char __user *buf,
|
|
size_t count, loff_t *f_pos)
|
|
{
|
|
struct usbtmc_device_data *data;
|
|
u8 *buffer;
|
|
int retval;
|
|
int actual;
|
|
unsigned long int n_bytes;
|
|
int remaining;
|
|
int done;
|
|
int this_part;
|
|
|
|
data = filp->private_data;
|
|
|
|
buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&data->io_mutex);
|
|
|
|
remaining = count;
|
|
done = 0;
|
|
|
|
while (remaining > 0) {
|
|
if (remaining > USBTMC_SIZE_IOBUFFER - 12) {
|
|
this_part = USBTMC_SIZE_IOBUFFER - 12;
|
|
buffer[8] = 0;
|
|
} else {
|
|
this_part = remaining;
|
|
buffer[8] = 1;
|
|
}
|
|
|
|
/* Setup IO buffer for DEV_DEP_MSG_OUT message */
|
|
buffer[0] = 1;
|
|
buffer[1] = data->bTag;
|
|
buffer[2] = ~(data->bTag);
|
|
buffer[3] = 0; /* Reserved */
|
|
buffer[4] = this_part & 255;
|
|
buffer[5] = (this_part >> 8) & 255;
|
|
buffer[6] = (this_part >> 16) & 255;
|
|
buffer[7] = (this_part >> 24) & 255;
|
|
/* buffer[8] is set above... */
|
|
buffer[9] = 0; /* Reserved */
|
|
buffer[10] = 0; /* Reserved */
|
|
buffer[11] = 0; /* Reserved */
|
|
|
|
if (copy_from_user(&buffer[12], buf + done, this_part)) {
|
|
retval = -EFAULT;
|
|
goto exit;
|
|
}
|
|
|
|
n_bytes = roundup(12 + this_part, 4);
|
|
memset(buffer + 12 + this_part, 0, n_bytes - (12 + this_part));
|
|
|
|
retval = usb_bulk_msg(data->usb_dev,
|
|
usb_sndbulkpipe(data->usb_dev,
|
|
data->bulk_out),
|
|
buffer, n_bytes, &actual, USBTMC_TIMEOUT);
|
|
|
|
data->bTag_last_write = data->bTag;
|
|
data->bTag++;
|
|
|
|
if (!data->bTag)
|
|
data->bTag++;
|
|
|
|
if (retval < 0) {
|
|
dev_err(&data->intf->dev,
|
|
"Unable to send data, error %d\n", retval);
|
|
if (data->auto_abort)
|
|
usbtmc_ioctl_abort_bulk_out(data);
|
|
goto exit;
|
|
}
|
|
|
|
remaining -= this_part;
|
|
done += this_part;
|
|
}
|
|
|
|
retval = count;
|
|
exit:
|
|
mutex_unlock(&data->io_mutex);
|
|
kfree(buffer);
|
|
return retval;
|
|
}
|
|
|
|
static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
|
|
{
|
|
struct usb_host_interface *current_setting;
|
|
struct usb_endpoint_descriptor *desc;
|
|
struct device *dev;
|
|
u8 *buffer;
|
|
int rv;
|
|
int n;
|
|
int actual;
|
|
int max_size;
|
|
|
|
dev = &data->intf->dev;
|
|
|
|
dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
|
|
|
|
buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_rcvctrlpipe(data->usb_dev, 0),
|
|
USBTMC_REQUEST_INITIATE_CLEAR,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
0, 0, buffer, 1, USBTMC_TIMEOUT);
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
|
|
|
|
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
|
|
dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
max_size = 0;
|
|
current_setting = data->intf->cur_altsetting;
|
|
for (n = 0; n < current_setting->desc.bNumEndpoints; n++) {
|
|
desc = ¤t_setting->endpoint[n].desc;
|
|
if (desc->bEndpointAddress == data->bulk_in)
|
|
max_size = le16_to_cpu(desc->wMaxPacketSize);
|
|
}
|
|
|
|
if (max_size == 0) {
|
|
dev_err(dev, "Couldn't get wMaxPacketSize\n");
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "wMaxPacketSize is %d\n", max_size);
|
|
|
|
n = 0;
|
|
|
|
usbtmc_clear_check_status:
|
|
|
|
dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n");
|
|
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_rcvctrlpipe(data->usb_dev, 0),
|
|
USBTMC_REQUEST_CHECK_CLEAR_STATUS,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
0, 0, buffer, 2, USBTMC_TIMEOUT);
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
|
|
|
|
if (buffer[0] == USBTMC_STATUS_SUCCESS)
|
|
goto usbtmc_clear_bulk_out_halt;
|
|
|
|
if (buffer[0] != USBTMC_STATUS_PENDING) {
|
|
dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
if (buffer[1] == 1)
|
|
do {
|
|
dev_dbg(dev, "Reading from bulk in EP\n");
|
|
|
|
rv = usb_bulk_msg(data->usb_dev,
|
|
usb_rcvbulkpipe(data->usb_dev,
|
|
data->bulk_in),
|
|
buffer, USBTMC_SIZE_IOBUFFER,
|
|
&actual, USBTMC_TIMEOUT);
|
|
n++;
|
|
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n",
|
|
rv);
|
|
goto exit;
|
|
}
|
|
} while ((actual == max_size) &&
|
|
(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
|
|
|
|
if (actual == max_size) {
|
|
dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
|
|
USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
goto usbtmc_clear_check_status;
|
|
|
|
usbtmc_clear_bulk_out_halt:
|
|
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_sndctrlpipe(data->usb_dev, 0),
|
|
USB_REQ_CLEAR_FEATURE,
|
|
USB_DIR_OUT | USB_TYPE_STANDARD |
|
|
USB_RECIP_ENDPOINT,
|
|
USB_ENDPOINT_HALT,
|
|
data->bulk_out, buffer, 0,
|
|
USBTMC_TIMEOUT);
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
rv = 0;
|
|
|
|
exit:
|
|
kfree(buffer);
|
|
return rv;
|
|
}
|
|
|
|
static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data)
|
|
{
|
|
u8 *buffer;
|
|
int rv;
|
|
|
|
buffer = kmalloc(2, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_sndctrlpipe(data->usb_dev, 0),
|
|
USB_REQ_CLEAR_FEATURE,
|
|
USB_DIR_OUT | USB_TYPE_STANDARD |
|
|
USB_RECIP_ENDPOINT,
|
|
USB_ENDPOINT_HALT, data->bulk_out,
|
|
buffer, 0, USBTMC_TIMEOUT);
|
|
|
|
if (rv < 0) {
|
|
dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
|
|
rv);
|
|
goto exit;
|
|
}
|
|
rv = 0;
|
|
|
|
exit:
|
|
kfree(buffer);
|
|
return rv;
|
|
}
|
|
|
|
static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data)
|
|
{
|
|
u8 *buffer;
|
|
int rv;
|
|
|
|
buffer = kmalloc(2, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
rv = usb_control_msg(data->usb_dev, usb_sndctrlpipe(data->usb_dev, 0),
|
|
USB_REQ_CLEAR_FEATURE,
|
|
USB_DIR_OUT | USB_TYPE_STANDARD |
|
|
USB_RECIP_ENDPOINT,
|
|
USB_ENDPOINT_HALT, data->bulk_in, buffer, 0,
|
|
USBTMC_TIMEOUT);
|
|
|
|
if (rv < 0) {
|
|
dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
|
|
rv);
|
|
goto exit;
|
|
}
|
|
rv = 0;
|
|
|
|
exit:
|
|
kfree(buffer);
|
|
return rv;
|
|
}
|
|
|
|
static int get_capabilities(struct usbtmc_device_data *data)
|
|
{
|
|
struct device *dev = &data->usb_dev->dev;
|
|
char *buffer;
|
|
int rv;
|
|
|
|
buffer = kmalloc(0x18, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0),
|
|
USBTMC_REQUEST_GET_CAPABILITIES,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
0, 0, buffer, 0x18, USBTMC_TIMEOUT);
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
return rv;
|
|
}
|
|
|
|
dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
|
|
dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]);
|
|
dev_dbg(dev, "Device capabilities are %x\n", buffer[5]);
|
|
dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]);
|
|
dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]);
|
|
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
|
|
dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
|
|
return -EPERM;
|
|
}
|
|
|
|
data->capabilities.interface_capabilities = buffer[4];
|
|
data->capabilities.device_capabilities = buffer[5];
|
|
data->capabilities.usb488_interface_capabilities = buffer[14];
|
|
data->capabilities.usb488_device_capabilities = buffer[15];
|
|
|
|
kfree(buffer);
|
|
return 0;
|
|
}
|
|
|
|
#define capability_attribute(name) \
|
|
static ssize_t show_##name(struct device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct usb_interface *intf = to_usb_interface(dev); \
|
|
struct usbtmc_device_data *data = usb_get_intfdata(intf); \
|
|
\
|
|
return sprintf(buf, "%d\n", data->capabilities.name); \
|
|
} \
|
|
static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
|
|
|
|
capability_attribute(interface_capabilities);
|
|
capability_attribute(device_capabilities);
|
|
capability_attribute(usb488_interface_capabilities);
|
|
capability_attribute(usb488_device_capabilities);
|
|
|
|
static struct attribute *capability_attrs[] = {
|
|
&dev_attr_interface_capabilities.attr,
|
|
&dev_attr_device_capabilities.attr,
|
|
&dev_attr_usb488_interface_capabilities.attr,
|
|
&dev_attr_usb488_device_capabilities.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group capability_attr_grp = {
|
|
.attrs = capability_attrs,
|
|
};
|
|
|
|
static ssize_t show_TermChar(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct usb_interface *intf = to_usb_interface(dev);
|
|
struct usbtmc_device_data *data = usb_get_intfdata(intf);
|
|
|
|
return sprintf(buf, "%c\n", data->TermChar);
|
|
}
|
|
|
|
static ssize_t store_TermChar(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct usb_interface *intf = to_usb_interface(dev);
|
|
struct usbtmc_device_data *data = usb_get_intfdata(intf);
|
|
|
|
if (count < 1)
|
|
return -EINVAL;
|
|
data->TermChar = buf[0];
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR(TermChar, S_IRUGO, show_TermChar, store_TermChar);
|
|
|
|
#define data_attribute(name) \
|
|
static ssize_t show_##name(struct device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct usb_interface *intf = to_usb_interface(dev); \
|
|
struct usbtmc_device_data *data = usb_get_intfdata(intf); \
|
|
\
|
|
return sprintf(buf, "%d\n", data->name); \
|
|
} \
|
|
static ssize_t store_##name(struct device *dev, \
|
|
struct device_attribute *attr, \
|
|
const char *buf, size_t count) \
|
|
{ \
|
|
struct usb_interface *intf = to_usb_interface(dev); \
|
|
struct usbtmc_device_data *data = usb_get_intfdata(intf); \
|
|
ssize_t result; \
|
|
unsigned val; \
|
|
\
|
|
result = sscanf(buf, "%u\n", &val); \
|
|
if (result != 1) \
|
|
result = -EINVAL; \
|
|
data->name = val; \
|
|
if (result < 0) \
|
|
return result; \
|
|
else \
|
|
return count; \
|
|
} \
|
|
static DEVICE_ATTR(name, S_IRUGO, show_##name, store_##name)
|
|
|
|
data_attribute(TermCharEnabled);
|
|
data_attribute(auto_abort);
|
|
|
|
static struct attribute *data_attrs[] = {
|
|
&dev_attr_TermChar.attr,
|
|
&dev_attr_TermCharEnabled.attr,
|
|
&dev_attr_auto_abort.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group data_attr_grp = {
|
|
.attrs = data_attrs,
|
|
};
|
|
|
|
static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data)
|
|
{
|
|
struct device *dev;
|
|
u8 *buffer;
|
|
int rv;
|
|
|
|
dev = &data->intf->dev;
|
|
|
|
buffer = kmalloc(2, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_rcvctrlpipe(data->usb_dev, 0),
|
|
USBTMC_REQUEST_INDICATOR_PULSE,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
0, 0, buffer, 0x01, USBTMC_TIMEOUT);
|
|
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
|
|
|
|
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
|
|
dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
rv = 0;
|
|
|
|
exit:
|
|
kfree(buffer);
|
|
return rv;
|
|
}
|
|
|
|
static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct usbtmc_device_data *data;
|
|
int retval = -EBADRQC;
|
|
|
|
data = file->private_data;
|
|
mutex_lock(&data->io_mutex);
|
|
|
|
switch (cmd) {
|
|
case USBTMC_IOCTL_CLEAR_OUT_HALT:
|
|
retval = usbtmc_ioctl_clear_out_halt(data);
|
|
break;
|
|
|
|
case USBTMC_IOCTL_CLEAR_IN_HALT:
|
|
retval = usbtmc_ioctl_clear_in_halt(data);
|
|
break;
|
|
|
|
case USBTMC_IOCTL_INDICATOR_PULSE:
|
|
retval = usbtmc_ioctl_indicator_pulse(data);
|
|
break;
|
|
|
|
case USBTMC_IOCTL_CLEAR:
|
|
retval = usbtmc_ioctl_clear(data);
|
|
break;
|
|
|
|
case USBTMC_IOCTL_ABORT_BULK_OUT:
|
|
retval = usbtmc_ioctl_abort_bulk_out(data);
|
|
break;
|
|
|
|
case USBTMC_IOCTL_ABORT_BULK_IN:
|
|
retval = usbtmc_ioctl_abort_bulk_in(data);
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&data->io_mutex);
|
|
return retval;
|
|
}
|
|
|
|
static struct file_operations fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = usbtmc_read,
|
|
.write = usbtmc_write,
|
|
.open = usbtmc_open,
|
|
.release = usbtmc_release,
|
|
.unlocked_ioctl = usbtmc_ioctl,
|
|
};
|
|
|
|
static struct usb_class_driver usbtmc_class = {
|
|
.name = "usbtmc%d",
|
|
.fops = &fops,
|
|
.minor_base = USBTMC_MINOR_BASE,
|
|
};
|
|
|
|
|
|
static int usbtmc_probe(struct usb_interface *intf,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct usbtmc_device_data *data;
|
|
struct usb_host_interface *iface_desc;
|
|
struct usb_endpoint_descriptor *endpoint;
|
|
int n;
|
|
int retcode;
|
|
|
|
dev_dbg(&intf->dev, "%s called\n", __func__);
|
|
|
|
data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL);
|
|
if (!data) {
|
|
dev_err(&intf->dev, "Unable to allocate kernel memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
data->intf = intf;
|
|
data->id = id;
|
|
data->usb_dev = usb_get_dev(interface_to_usbdev(intf));
|
|
usb_set_intfdata(intf, data);
|
|
kref_init(&data->kref);
|
|
mutex_init(&data->io_mutex);
|
|
|
|
/* Initialize USBTMC bTag and other fields */
|
|
data->bTag = 1;
|
|
data->TermCharEnabled = 0;
|
|
data->TermChar = '\n';
|
|
|
|
/* USBTMC devices have only one setting, so use that */
|
|
iface_desc = data->intf->cur_altsetting;
|
|
|
|
/* Find bulk in endpoint */
|
|
for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
|
|
endpoint = &iface_desc->endpoint[n].desc;
|
|
|
|
if (usb_endpoint_is_bulk_in(endpoint)) {
|
|
data->bulk_in = endpoint->bEndpointAddress;
|
|
dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n",
|
|
data->bulk_in);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Find bulk out endpoint */
|
|
for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
|
|
endpoint = &iface_desc->endpoint[n].desc;
|
|
|
|
if (usb_endpoint_is_bulk_out(endpoint)) {
|
|
data->bulk_out = endpoint->bEndpointAddress;
|
|
dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n",
|
|
data->bulk_out);
|
|
break;
|
|
}
|
|
}
|
|
|
|
retcode = get_capabilities(data);
|
|
if (retcode)
|
|
dev_err(&intf->dev, "can't read capabilities\n");
|
|
else
|
|
retcode = sysfs_create_group(&intf->dev.kobj,
|
|
&capability_attr_grp);
|
|
|
|
retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp);
|
|
|
|
retcode = usb_register_dev(intf, &usbtmc_class);
|
|
if (retcode) {
|
|
dev_err(&intf->dev, "Not able to get a minor"
|
|
" (base %u, slice default): %d\n", USBTMC_MINOR_BASE,
|
|
retcode);
|
|
goto error_register;
|
|
}
|
|
dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor);
|
|
|
|
return 0;
|
|
|
|
error_register:
|
|
sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
|
|
sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
|
|
kref_put(&data->kref, usbtmc_delete);
|
|
return retcode;
|
|
}
|
|
|
|
static void usbtmc_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct usbtmc_device_data *data;
|
|
|
|
dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
|
|
|
|
data = usb_get_intfdata(intf);
|
|
usb_deregister_dev(intf, &usbtmc_class);
|
|
sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
|
|
sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
|
|
kref_put(&data->kref, usbtmc_delete);
|
|
}
|
|
|
|
static struct usb_driver usbtmc_driver = {
|
|
.name = "usbtmc",
|
|
.id_table = usbtmc_devices,
|
|
.probe = usbtmc_probe,
|
|
.disconnect = usbtmc_disconnect
|
|
};
|
|
|
|
static int __init usbtmc_init(void)
|
|
{
|
|
int retcode;
|
|
|
|
retcode = usb_register(&usbtmc_driver);
|
|
if (retcode)
|
|
printk(KERN_ERR KBUILD_MODNAME": Unable to register driver\n");
|
|
return retcode;
|
|
}
|
|
module_init(usbtmc_init);
|
|
|
|
static void __exit usbtmc_exit(void)
|
|
{
|
|
usb_deregister(&usbtmc_driver);
|
|
}
|
|
module_exit(usbtmc_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|