v4.19.13 snapshot.
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
new file mode 100644
index 0000000..83ffa5a
--- /dev/null
+++ b/drivers/usb/class/usbtmc.c
@@ -0,0 +1,1721 @@
+// 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/compat.h>
+#include <linux/usb/tmc.h>
+
+
+#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
+
+/* Minimum USB timeout (in milliseconds) */
+#define USBTMC_MIN_TIMEOUT 100
+/* 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;
+ struct list_head file_list;
+
+ 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;
+
+ /* coalesced usb488_caps from usbtmc_dev_capabilities */
+ __u8 usb488_caps;
+
+ /* 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;
+ spinlock_t dev_lock; /* lock for file_list */
+};
+#define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
+
+/*
+ * This structure holds private data for each USBTMC file handle.
+ */
+struct usbtmc_file_data {
+ struct usbtmc_device_data *data;
+ struct list_head file_elem;
+
+ u32 timeout;
+ u8 srq_byte;
+ atomic_t srq_asserted;
+ u8 eom_val;
+ u8 term_char;
+ bool term_char_enabled;
+};
+
+/* 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;
+ struct usbtmc_file_data *file_data;
+
+ intf = usb_find_interface(&usbtmc_driver, iminor(inode));
+ if (!intf) {
+ pr_err("can not find device for minor %d", iminor(inode));
+ return -ENODEV;
+ }
+
+ file_data = kzalloc(sizeof(*file_data), GFP_KERNEL);
+ if (!file_data)
+ return -ENOMEM;
+
+ data = usb_get_intfdata(intf);
+ /* Protect reference to data from file structure until release */
+ kref_get(&data->kref);
+
+ mutex_lock(&data->io_mutex);
+ file_data->data = data;
+
+ /* copy default values from device settings */
+ file_data->timeout = USBTMC_TIMEOUT;
+ file_data->term_char = data->TermChar;
+ file_data->term_char_enabled = data->TermCharEnabled;
+ file_data->eom_val = 1;
+
+ INIT_LIST_HEAD(&file_data->file_elem);
+ spin_lock_irq(&data->dev_lock);
+ list_add_tail(&file_data->file_elem, &data->file_list);
+ spin_unlock_irq(&data->dev_lock);
+ mutex_unlock(&data->io_mutex);
+
+ /* Store pointer in file structure's private data field */
+ filp->private_data = file_data;
+
+ return 0;
+}
+
+static int usbtmc_release(struct inode *inode, struct file *file)
+{
+ struct usbtmc_file_data *file_data = file->private_data;
+
+ /* prevent IO _AND_ usbtmc_interrupt */
+ mutex_lock(&file_data->data->io_mutex);
+ spin_lock_irq(&file_data->data->dev_lock);
+
+ list_del(&file_data->file_elem);
+
+ spin_unlock_irq(&file_data->data->dev_lock);
+ mutex_unlock(&file_data->data->io_mutex);
+
+ kref_put(&file_data->data->kref, usbtmc_delete);
+ file_data->data = NULL;
+ kfree(file_data);
+ 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_file_data *file_data,
+ void __user *arg)
+{
+ struct usbtmc_device_data *data = file_data->data;
+ struct device *dev = &data->intf->dev;
+ int srq_asserted = 0;
+ u8 *buffer;
+ u8 tag;
+ __u8 stb;
+ int rv;
+
+ dev_dbg(dev, "Enter ioctl_read_stb iin_ep_present: %d\n",
+ data->iin_ep_present);
+
+ spin_lock_irq(&data->dev_lock);
+ srq_asserted = atomic_xchg(&file_data->srq_asserted, srq_asserted);
+ if (srq_asserted) {
+ /* a STB with SRQ is already received */
+ stb = file_data->srq_byte;
+ spin_unlock_irq(&data->dev_lock);
+ rv = put_user(stb, (__u8 __user *)arg);
+ dev_dbg(dev, "stb:0x%02x with srq received %d\n",
+ (unsigned int)stb, rv);
+ return rv;
+ }
+ spin_unlock_irq(&data->dev_lock);
+
+ buffer = kmalloc(8, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ atomic_set(&data->iin_data_valid, 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,
+ file_data->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 = -ETIMEDOUT;
+ 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 = put_user(stb, (__u8 __user *)arg);
+ dev_dbg(dev, "stb:0x%02x received %d\n", (unsigned int)stb, rv);
+
+ 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 TRIGGER Bulk-OUT command message
+ * See the USBTMC-USB488 specification, Table 2.
+ *
+ * Also updates bTag_last_write.
+ */
+static int usbtmc488_ioctl_trigger(struct usbtmc_file_data *file_data)
+{
+ struct usbtmc_device_data *data = file_data->data;
+ int retval;
+ u8 *buffer;
+ int actual;
+
+ buffer = kzalloc(USBTMC_HEADER_SIZE, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ buffer[0] = 128;
+ buffer[1] = data->bTag;
+ buffer[2] = ~data->bTag;
+
+ retval = usb_bulk_msg(data->usb_dev,
+ usb_sndbulkpipe(data->usb_dev,
+ data->bulk_out),
+ buffer, USBTMC_HEADER_SIZE,
+ &actual, file_data->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, "%s returned %d\n",
+ __func__, retval);
+ return retval;
+ }
+
+ return 0;
+}
+
+/*
+ * 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_file_data *file_data,
+ size_t transfer_size)
+{
+ struct usbtmc_device_data *data = file_data->data;
+ 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] = file_data->term_char_enabled * 2;
+ /* Use term character? */
+ buffer[9] = file_data->term_char;
+ 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, file_data->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_file_data *file_data;
+ 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 */
+ file_data = filp->private_data;
+ data = file_data->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;
+ }
+
+ dev_dbg(dev, "usb_bulk_msg_in: count(%zu)\n", count);
+
+ retval = send_request_dev_dep_msg_in(file_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) {
+ /* Send bulk URB */
+ retval = usb_bulk_msg(data->usb_dev,
+ usb_rcvbulkpipe(data->usb_dev,
+ data->bulk_in),
+ buffer, USBTMC_SIZE_IOBUFFER, &actual,
+ file_data->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) {
+ /* 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 (remaining > n_characters)
+ remaining = n_characters;
+ /* Remove padding if it exists */
+ if (actual > remaining)
+ actual = remaining;
+
+ 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_file_data *file_data;
+ struct usbtmc_device_data *data;
+ u8 *buffer;
+ int retval;
+ int actual;
+ unsigned long int n_bytes;
+ int remaining;
+ int done;
+ int this_part;
+
+ file_data = filp->private_data;
+ data = file_data->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] = file_data->eom_val;
+ }
+
+ /* 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, file_data->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));
+
+ if (rv < 0) {
+ dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
+ rv);
+ return rv;
+ }
+ return 0;
+}
+
+static int get_capabilities(struct usbtmc_device_data *data)
+{
+ struct device *dev = &data->usb_dev->dev;
+ char *buffer;
+ int rv = 0;
+
+ 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);
+ goto err_out;
+ }
+
+ dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
+ if (buffer[0] != USBTMC_STATUS_SUCCESS) {
+ dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
+ rv = -EPERM;
+ goto err_out;
+ }
+ 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]);
+
+ 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];
+ data->usb488_caps = (buffer[14] & 0x07) | ((buffer[15] & 0x0f) << 4);
+ rv = 0;
+
+err_out:
+ kfree(buffer);
+ return rv;
+}
+
+#define capability_attribute(name) \
+static ssize_t name##_show(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_RO(name)
+
+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 const struct attribute_group capability_attr_grp = {
+ .attrs = capability_attrs,
+};
+
+static ssize_t TermChar_show(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 TermChar_store(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_RW(TermChar);
+
+#define data_attribute(name) \
+static ssize_t name##_show(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 name##_store(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_RW(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 const 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;
+}
+
+/*
+ * Get the usb timeout value
+ */
+static int usbtmc_ioctl_get_timeout(struct usbtmc_file_data *file_data,
+ void __user *arg)
+{
+ u32 timeout;
+
+ timeout = file_data->timeout;
+
+ return put_user(timeout, (__u32 __user *)arg);
+}
+
+/*
+ * Set the usb timeout value
+ */
+static int usbtmc_ioctl_set_timeout(struct usbtmc_file_data *file_data,
+ void __user *arg)
+{
+ u32 timeout;
+
+ if (get_user(timeout, (__u32 __user *)arg))
+ return -EFAULT;
+
+ /* Note that timeout = 0 means
+ * MAX_SCHEDULE_TIMEOUT in usb_control_msg
+ */
+ if (timeout < USBTMC_MIN_TIMEOUT)
+ return -EINVAL;
+
+ file_data->timeout = timeout;
+
+ 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;
+}
+
+/*
+ * Configure termination character for read()
+ */
+static int usbtmc_ioctl_config_termc(struct usbtmc_file_data *file_data,
+ void __user *arg)
+{
+ struct usbtmc_termchar termc;
+
+ if (copy_from_user(&termc, arg, sizeof(termc)))
+ return -EFAULT;
+
+ if ((termc.term_char_enabled > 1) ||
+ (termc.term_char_enabled &&
+ !(file_data->data->capabilities.device_capabilities & 1)))
+ return -EINVAL;
+
+ file_data->term_char = termc.term_char;
+ file_data->term_char_enabled = termc.term_char_enabled;
+
+ return 0;
+}
+
+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;
+
+ file_data = file->private_data;
+ data = file_data->data;
+
+ mutex_lock(&data->io_mutex);
+ if (data->zombie) {
+ retval = -ENODEV;
+ goto skip_io_on_zombie;
+ }
+
+ 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;
+
+ case USBTMC_IOCTL_GET_TIMEOUT:
+ retval = usbtmc_ioctl_get_timeout(file_data,
+ (void __user *)arg);
+ break;
+
+ case USBTMC_IOCTL_SET_TIMEOUT:
+ retval = usbtmc_ioctl_set_timeout(file_data,
+ (void __user *)arg);
+ break;
+
+ case USBTMC_IOCTL_EOM_ENABLE:
+ retval = usbtmc_ioctl_eom_enable(file_data,
+ (void __user *)arg);
+ break;
+
+ case USBTMC_IOCTL_CONFIG_TERMCHAR:
+ retval = usbtmc_ioctl_config_termc(file_data,
+ (void __user *)arg);
+ break;
+
+ case USBTMC488_IOCTL_GET_CAPS:
+ retval = copy_to_user((void __user *)arg,
+ &data->usb488_caps,
+ sizeof(data->usb488_caps));
+ if (retval)
+ retval = -EFAULT;
+ break;
+
+ case USBTMC488_IOCTL_READ_STB:
+ retval = usbtmc488_ioctl_read_stb(file_data,
+ (void __user *)arg);
+ break;
+
+ case USBTMC488_IOCTL_REN_CONTROL:
+ retval = usbtmc488_ioctl_simple(data, (void __user *)arg,
+ USBTMC488_REQUEST_REN_CONTROL);
+ break;
+
+ case USBTMC488_IOCTL_GOTO_LOCAL:
+ retval = usbtmc488_ioctl_simple(data, (void __user *)arg,
+ USBTMC488_REQUEST_GOTO_LOCAL);
+ break;
+
+ case USBTMC488_IOCTL_LOCAL_LOCKOUT:
+ retval = usbtmc488_ioctl_simple(data, (void __user *)arg,
+ USBTMC488_REQUEST_LOCAL_LOCKOUT);
+ break;
+
+ case USBTMC488_IOCTL_TRIGGER:
+ retval = usbtmc488_ioctl_trigger(file_data);
+ break;
+ }
+
+skip_io_on_zombie:
+ mutex_unlock(&data->io_mutex);
+ return retval;
+}
+
+static int usbtmc_fasync(int fd, struct file *file, int on)
+{
+ struct usbtmc_file_data *file_data = file->private_data;
+
+ return fasync_helper(fd, file, on, &file_data->data->fasync);
+}
+
+static __poll_t usbtmc_poll(struct file *file, poll_table *wait)
+{
+ struct usbtmc_file_data *file_data = file->private_data;
+ struct usbtmc_device_data *data = file_data->data;
+ __poll_t mask;
+
+ mutex_lock(&data->io_mutex);
+
+ if (data->zombie) {
+ mask = EPOLLHUP | EPOLLERR;
+ goto no_poll;
+ }
+
+ poll_wait(file, &data->waitq, wait);
+
+ mask = (atomic_read(&file_data->srq_asserted)) ? EPOLLPRI : 0;
+
+no_poll:
+ mutex_unlock(&data->io_mutex);
+ return mask;
+}
+
+static const struct file_operations fops = {
+ .owner = THIS_MODULE,
+ .read = usbtmc_read,
+ .write = usbtmc_write,
+ .open = usbtmc_open,
+ .release = usbtmc_release,
+ .unlocked_ioctl = usbtmc_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = usbtmc_ioctl,
+#endif
+ .fasync = usbtmc_fasync,
+ .poll = usbtmc_poll,
+ .llseek = default_llseek,
+};
+
+static struct usb_class_driver usbtmc_class = {
+ .name = "usbtmc%d",
+ .fops = &fops,
+ .minor_base = USBTMC_MINOR_BASE,
+};
+
+static void usbtmc_interrupt(struct urb *urb)
+{
+ struct usbtmc_device_data *data = urb->context;
+ struct device *dev = &data->intf->dev;
+ int status = urb->status;
+ int rv;
+
+ dev_dbg(&data->intf->dev, "int status: %d len %d\n",
+ status, urb->actual_length);
+
+ switch (status) {
+ case 0: /* SUCCESS */
+ /* check for valid STB notification */
+ if (data->iin_buffer[0] > 0x81) {
+ data->bNotify1 = data->iin_buffer[0];
+ data->bNotify2 = data->iin_buffer[1];
+ atomic_set(&data->iin_data_valid, 1);
+ wake_up_interruptible(&data->waitq);
+ goto exit;
+ }
+ /* check for SRQ notification */
+ if (data->iin_buffer[0] == 0x81) {
+ unsigned long flags;
+ struct list_head *elem;
+
+ if (data->fasync)
+ kill_fasync(&data->fasync,
+ SIGIO, POLL_PRI);
+
+ spin_lock_irqsave(&data->dev_lock, flags);
+ list_for_each(elem, &data->file_list) {
+ struct usbtmc_file_data *file_data;
+
+ file_data = list_entry(elem,
+ struct usbtmc_file_data,
+ file_elem);
+ file_data->srq_byte = data->iin_buffer[1];
+ atomic_set(&file_data->srq_asserted, 1);
+ }
+ spin_unlock_irqrestore(&data->dev_lock, flags);
+
+ dev_dbg(dev, "srq received bTag %x stb %x\n",
+ (unsigned int)data->iin_buffer[0],
+ (unsigned int)data->iin_buffer[1]);
+ wake_up_interruptible_all(&data->waitq);
+ goto exit;
+ }
+ dev_warn(dev, "invalid notification: %x\n",
+ data->iin_buffer[0]);
+ break;
+ case -EOVERFLOW:
+ dev_err(dev, "overflow with length %d, actual length is %d\n",
+ data->iin_wMaxPacketSize, urb->actual_length);
+ /* fall through */
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ case -EILSEQ:
+ case -ETIME:
+ case -EPIPE:
+ /* urb terminated, clean up */
+ dev_dbg(dev, "urb terminated, status: %d\n", status);
+ return;
+ default:
+ dev_err(dev, "unknown status received: %d\n", status);
+ }
+exit:
+ rv = usb_submit_urb(urb, GFP_ATOMIC);
+ if (rv)
+ dev_err(dev, "usb_submit_urb failed: %d\n", rv);
+}
+
+static void usbtmc_free_int(struct usbtmc_device_data *data)
+{
+ if (!data->iin_ep_present || !data->iin_urb)
+ return;
+ usb_kill_urb(data->iin_urb);
+ kfree(data->iin_buffer);
+ usb_free_urb(data->iin_urb);
+ kref_put(&data->kref, usbtmc_delete);
+}
+
+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 *bulk_in, *bulk_out, *int_in;
+ int retcode;
+
+ dev_dbg(&intf->dev, "%s called\n", __func__);
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ 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);
+ init_waitqueue_head(&data->waitq);
+ atomic_set(&data->iin_data_valid, 0);
+ INIT_LIST_HEAD(&data->file_list);
+ spin_lock_init(&data->dev_lock);
+
+ data->zombie = 0;
+
+ /* Initialize USBTMC bTag and other fields */
+ data->bTag = 1;
+ data->TermCharEnabled = 0;
+ data->TermChar = '\n';
+ /* 2 <= bTag <= 127 USBTMC-USB488 subclass specification 4.3.1 */
+ data->iin_bTag = 2;
+
+ /* USBTMC devices have only one setting, so use that */
+ iface_desc = data->intf->cur_altsetting;
+ data->ifnum = iface_desc->desc.bInterfaceNumber;
+
+ /* Find bulk endpoints */
+ retcode = usb_find_common_endpoints(iface_desc,
+ &bulk_in, &bulk_out, NULL, NULL);
+ if (retcode) {
+ dev_err(&intf->dev, "bulk endpoints not found\n");
+ goto err_put;
+ }
+
+ data->bulk_in = bulk_in->bEndpointAddress;
+ dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n", data->bulk_in);
+
+ data->bulk_out = bulk_out->bEndpointAddress;
+ dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n", data->bulk_out);
+
+ /* Find int endpoint */
+ retcode = usb_find_int_in_endpoint(iface_desc, &int_in);
+ if (!retcode) {
+ data->iin_ep_present = 1;
+ data->iin_ep = int_in->bEndpointAddress;
+ data->iin_wMaxPacketSize = usb_endpoint_maxp(int_in);
+ data->iin_interval = int_in->bInterval;
+ dev_dbg(&intf->dev, "Found Int in endpoint at %u\n",
+ data->iin_ep);
+ }
+
+ 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);
+
+ if (data->iin_ep_present) {
+ /* allocate int urb */
+ data->iin_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!data->iin_urb) {
+ retcode = -ENOMEM;
+ goto error_register;
+ }
+
+ /* Protect interrupt in endpoint data until iin_urb is freed */
+ kref_get(&data->kref);
+
+ /* allocate buffer for interrupt in */
+ data->iin_buffer = kmalloc(data->iin_wMaxPacketSize,
+ GFP_KERNEL);
+ if (!data->iin_buffer) {
+ retcode = -ENOMEM;
+ goto error_register;
+ }
+
+ /* fill interrupt urb */
+ usb_fill_int_urb(data->iin_urb, data->usb_dev,
+ usb_rcvintpipe(data->usb_dev, data->iin_ep),
+ data->iin_buffer, data->iin_wMaxPacketSize,
+ usbtmc_interrupt,
+ data, data->iin_interval);
+
+ retcode = usb_submit_urb(data->iin_urb, GFP_KERNEL);
+ if (retcode) {
+ dev_err(&intf->dev, "Failed to submit iin_urb\n");
+ goto error_register;
+ }
+ }
+
+ 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);
+ usbtmc_free_int(data);
+err_put:
+ kref_put(&data->kref, usbtmc_delete);
+ return retcode;
+}
+
+static void usbtmc_disconnect(struct usb_interface *intf)
+{
+ struct usbtmc_device_data *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);
+ mutex_lock(&data->io_mutex);
+ data->zombie = 1;
+ wake_up_interruptible_all(&data->waitq);
+ mutex_unlock(&data->io_mutex);
+ usbtmc_free_int(data);
+ kref_put(&data->kref, usbtmc_delete);
+}
+
+static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message)
+{
+ /* this driver does not have pending URBs */
+ return 0;
+}
+
+static int usbtmc_resume(struct usb_interface *intf)
+{
+ return 0;
+}
+
+static struct usb_driver usbtmc_driver = {
+ .name = "usbtmc",
+ .id_table = usbtmc_devices,
+ .probe = usbtmc_probe,
+ .disconnect = usbtmc_disconnect,
+ .suspend = usbtmc_suspend,
+ .resume = usbtmc_resume,
+};
+
+module_usb_driver(usbtmc_driver);
+
+MODULE_LICENSE("GPL");