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usbtmc.c
1540 lines (1273 loc) · 37 KB
/
usbtmc.c
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// SPDX-License-Identifier: GPL-2.0+
/**
* drivers/usb/class/usbtmc.c - USB Test & Measurement class driver
*
* Copyright (C) 2007 Stefan Kopp, Gechingen, Germany
* Copyright (C) 2008 Novell, Inc.
* Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/kref.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/mutex.h>
#include <linux/usb.h>
#include <linux/usb/tmc.h>
#define RIGOL 1
#define USBTMC_HEADER_SIZE 12
#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 5000
/*
* 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 const 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,
* and section 4.2.2 of the USBTMC usb488 subclass
* 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 */
/* data for interrupt in endpoint handling */
u8 bNotify1;
u8 bNotify2;
u16 ifnum;
u8 iin_bTag;
u8 *iin_buffer;
atomic_t iin_data_valid;
unsigned int iin_ep;
int iin_ep_present;
int iin_interval;
struct urb *iin_urb;
u16 iin_wMaxPacketSize;
atomic_t srq_asserted;
/* coalesced usb488_caps from usbtmc_dev_capabilities */
__u8 usb488_caps;
u8 rigol_quirk;
/* attributes from the USB TMC spec for this device */
u8 TermChar;
bool TermCharEnabled;
bool auto_abort;
bool zombie; /* fd of disconnected device */
struct usbtmc_dev_capabilities capabilities;
struct kref kref;
struct mutex io_mutex; /* only one i/o function running at a time */
wait_queue_head_t waitq;
struct fasync_struct *fasync;
};
#define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
struct usbtmc_ID_rigol_quirk {
__u16 idVendor;
__u16 idProduct;
};
static const struct usbtmc_ID_rigol_quirk usbtmc_id_quirk[] = {
{ 0x1ab1, 0x0588 },
{ 0x1ab1, 0x04b0 },
{ 0, 0 }
};
/* 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) {
pr_err("can not find device for minor %d", iminor(inode));
return -ENODEV;
}
data = usb_get_intfdata(intf);
/* Protect reference to data from file structure until release */
kref_get(&data->kref);
/* Store pointer in file structure's private data field */
filp->private_data = data;
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 = usb_endpoint_maxp(¤t_setting->endpoint[n].desc);
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_clear_halt(data->usb_dev,
usb_sndbulkpipe(data->usb_dev, data->bulk_out));
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n", rv);
goto exit;
}
rv = 0;
exit:
kfree(buffer);
return rv;
}
static int usbtmc488_ioctl_read_stb(struct usbtmc_device_data *data,
void __user *arg)
{
struct device *dev = &data->intf->dev;
u8 *buffer;
u8 tag;
__u8 stb;
int rv;
dev_dbg(dev, "Enter ioctl_read_stb iin_ep_present: %d\n",
data->iin_ep_present);
buffer = kmalloc(8, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
atomic_set(&data->iin_data_valid, 0);
/* must issue read_stb before using poll or select */
atomic_set(&data->srq_asserted, 0);
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
USBTMC488_REQUEST_READ_STATUS_BYTE,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
data->iin_bTag,
data->ifnum,
buffer, 0x03, USBTMC_TIMEOUT);
if (rv < 0) {
dev_err(dev, "stb usb_control_msg returned %d\n", rv);
goto exit;
}
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
dev_err(dev, "control status returned %x\n", buffer[0]);
rv = -EIO;
goto exit;
}
if (data->iin_ep_present) {
rv = wait_event_interruptible_timeout(
data->waitq,
atomic_read(&data->iin_data_valid) != 0,
USBTMC_TIMEOUT);
if (rv < 0) {
dev_dbg(dev, "wait interrupted %d\n", rv);
goto exit;
}
if (rv == 0) {
dev_dbg(dev, "wait timed out\n");
rv = -ETIME;
goto exit;
}
tag = data->bNotify1 & 0x7f;
if (tag != data->iin_bTag) {
dev_err(dev, "expected bTag %x got %x\n",
data->iin_bTag, tag);
}
stb = data->bNotify2;
} else {
stb = buffer[2];
}
rv = copy_to_user(arg, &stb, sizeof(stb));
if (rv)
rv = -EFAULT;
exit:
/* bump interrupt bTag */
data->iin_bTag += 1;
if (data->iin_bTag > 127)
/* 1 is for SRQ see USBTMC-USB488 subclass spec section 4.3.1 */
data->iin_bTag = 2;
kfree(buffer);
return rv;
}
static int usbtmc488_ioctl_simple(struct usbtmc_device_data *data,
void __user *arg, unsigned int cmd)
{
struct device *dev = &data->intf->dev;
__u8 val;
u8 *buffer;
u16 wValue;
int rv;
if (!(data->usb488_caps & USBTMC488_CAPABILITY_SIMPLE))
return -EINVAL;
buffer = kmalloc(8, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
if (cmd == USBTMC488_REQUEST_REN_CONTROL) {
rv = copy_from_user(&val, arg, sizeof(val));
if (rv) {
rv = -EFAULT;
goto exit;
}
wValue = val ? 1 : 0;
} else {
wValue = 0;
}
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
cmd,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
wValue,
data->ifnum,
buffer, 0x01, USBTMC_TIMEOUT);
if (rv < 0) {
dev_err(dev, "simple usb_control_msg failed %d\n", rv);
goto exit;
} else if (rv != 1) {
dev_warn(dev, "simple usb_control_msg returned %d\n", rv);
rv = -EIO;
goto exit;
}
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
dev_err(dev, "simple control status returned %x\n", buffer[0]);
rv = -EIO;
goto exit;
}
rv = 0;
exit:
kfree(buffer);
return rv;
}
/*
* Sends a REQUEST_DEV_DEP_MSG_IN message on the Bulk-OUT endpoint.
* @transfer_size: number of bytes to request from the device.
*
* See the USBTMC specification, Table 4.
*
* Also updates bTag_last_write.
*/
static int send_request_dev_dep_msg_in(struct usbtmc_device_data *data, size_t transfer_size)
{
int retval;
u8 *buffer;
int actual;
buffer = kmalloc(USBTMC_HEADER_SIZE, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
/* Setup IO buffer for REQUEST_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] = transfer_size >> 0;
buffer[5] = transfer_size >> 8;
buffer[6] = transfer_size >> 16;
buffer[7] = transfer_size >> 24;
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, USBTMC_HEADER_SIZE, &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++;
kfree(buffer);
if (retval < 0) {
dev_err(&data->intf->dev, "usb_bulk_msg in send_request_dev_dep_msg_in() returned %d\n", retval);
return retval;
}
return 0;
}
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;
u32 n_characters;
u8 *buffer;
int actual;
size_t done;
size_t remaining;
int retval;
size_t 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);
if (data->zombie) {
retval = -ENODEV;
goto exit;
}
if (data->rigol_quirk) {
dev_dbg(dev, "usb_bulk_msg_in: count(%zu)\n", count);
retval = send_request_dev_dep_msg_in(data, count);
if (retval < 0) {
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_out(data);
goto exit;
}
}
/* Loop until we have fetched everything we requested */
remaining = count;
this_part = remaining;
done = 0;
while (remaining > 0) {
if (!data->rigol_quirk) {
dev_dbg(dev, "usb_bulk_msg_in: remaining(%zu), count(%zu)\n", remaining, count);
if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3)
this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3;
else
this_part = remaining;
retval = send_request_dev_dep_msg_in(data, this_part);
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);
dev_dbg(dev, "usb_bulk_msg: retval(%u), done(%zu), remaining(%zu), actual(%d)\n", retval, done, remaining, actual);
/* Store bTag (in case we need to abort) */
data->bTag_last_read = data->bTag;
if (retval < 0) {
dev_dbg(dev, "Unable to read data, error %d\n", retval);
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
/* Parse header in first packet */
if ((done == 0) || !data->rigol_quirk) {
/* 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)
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)
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)
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);
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)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
/* Remove the USBTMC header */
actual -= USBTMC_HEADER_SIZE;
/* Check if the message is smaller than requested */
if (data->rigol_quirk) {
if (remaining > n_characters)
remaining = n_characters;
/* Remove padding if it exists */
if (actual > remaining)
actual = remaining;
}
else {
if (this_part > n_characters)
this_part = n_characters;
/* Remove padding if it exists */
if (actual > this_part)
actual = this_part;
}
dev_dbg(dev, "Bulk-IN header: N_characters(%u), bTransAttr(%u)\n", n_characters, buffer[8]);
remaining -= actual;
/* Terminate if end-of-message bit received from device */
if ((buffer[8] & 0x01) && (actual >= n_characters))
remaining = 0;
dev_dbg(dev, "Bulk-IN header: remaining(%zu), buf(%p), buffer(%p) done(%zu)\n", remaining,buf,buffer,done);
/* Copy buffer to user space */
if (copy_to_user(buf + done, &buffer[USBTMC_HEADER_SIZE], actual)) {
/* There must have been an addressing problem */
retval = -EFAULT;
goto exit;
}
done += actual;
}
else {
if (actual > remaining)
actual = remaining;
remaining -= actual;
dev_dbg(dev, "Bulk-IN header cont: actual(%u), done(%zu), remaining(%zu), buf(%p), buffer(%p)\n", actual, done, remaining,buf,buffer);
/* Copy buffer to user space */
if (copy_to_user(buf + done, buffer, actual)) {
/* There must have been an addressing problem */
retval = -EFAULT;
goto exit;
}
done += actual;
}
}
/* 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);
if (data->zombie) {
retval = -ENODEV;
goto exit;
}
remaining = count;
done = 0;
while (remaining > 0) {
if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE) {
this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE;
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 >> 0;
buffer[5] = this_part >> 8;
buffer[6] = this_part >> 16;
buffer[7] = this_part >> 24;
/* buffer[8] is set above... */
buffer[9] = 0; /* Reserved */
buffer[10] = 0; /* Reserved */
buffer[11] = 0; /* Reserved */
if (copy_from_user(&buffer[USBTMC_HEADER_SIZE], buf + done, this_part)) {
retval = -EFAULT;
goto exit;
}
n_bytes = roundup(USBTMC_HEADER_SIZE + this_part, 4);
memset(buffer + USBTMC_HEADER_SIZE + this_part, 0, n_bytes - (USBTMC_HEADER_SIZE + this_part));
do {
retval = usb_bulk_msg(data->usb_dev,
usb_sndbulkpipe(data->usb_dev,
data->bulk_out),
buffer, n_bytes,
&actual, USBTMC_TIMEOUT);
if (retval != 0)
break;
n_bytes -= actual;
} while (n_bytes);
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 = 0;
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 = usb_endpoint_maxp(desc);
}
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_clear_halt(data->usb_dev,
usb_sndbulkpipe(data->usb_dev, data->bulk_out));
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)
{
int rv;
rv = usb_clear_halt(data->usb_dev,
usb_sndbulkpipe(data->usb_dev, data->bulk_out));
if (rv < 0) {
dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
rv);
return rv;
}
return 0;
}
static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data)
{
int rv;
rv = usb_clear_halt(data->usb_dev,
usb_rcvbulkpipe(data->usb_dev, data->bulk_in));