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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>
- * Copyright (C) 2018 IVI Foundation, Inc.
- */
- #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>
- /* Increment API VERSION when changing tmc.h with new flags or ioctls
- * or when changing a significant behavior of the driver.
- */
- #define USBTMC_API_VERSION (2)
- #define USBTMC_HEADER_SIZE 12
- #define USBTMC_MINOR_BASE 176
- /* Minimum USB timeout (in milliseconds) */
- #define USBTMC_MIN_TIMEOUT 100
- /* Default USB timeout (in milliseconds) */
- #define USBTMC_TIMEOUT 5000
- /* Max number of urbs used in write transfers */
- #define MAX_URBS_IN_FLIGHT 16
- /* I/O buffer size used in generic read/write functions */
- #define USBTMC_BUFSIZE (4096)
- /*
- * 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 */
- /* packet size of IN bulk */
- u16 wMaxPacketSize;
- /* 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;
- 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;
- atomic_t closing;
- u8 bmTransferAttributes; /* member of DEV_DEP_MSG_IN */
- u8 eom_val;
- u8 term_char;
- bool term_char_enabled;
- bool auto_abort;
- spinlock_t err_lock; /* lock for errors */
- struct usb_anchor submitted;
- /* data for generic_write */
- struct semaphore limit_write_sem;
- u32 out_transfer_size;
- int out_status;
- /* data for generic_read */
- u32 in_transfer_size;
- int in_status;
- int in_urbs_used;
- struct usb_anchor in_anchor;
- wait_queue_head_t wait_bulk_in;
- };
- /* Forward declarations */
- static struct usb_driver usbtmc_driver;
- static void usbtmc_draw_down(struct usbtmc_file_data *file_data);
- 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;
- spin_lock_init(&file_data->err_lock);
- sema_init(&file_data->limit_write_sem, MAX_URBS_IN_FLIGHT);
- init_usb_anchor(&file_data->submitted);
- init_usb_anchor(&file_data->in_anchor);
- init_waitqueue_head(&file_data->wait_bulk_in);
- 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;
- atomic_set(&file_data->closing, 0);
- file_data->timeout = USBTMC_TIMEOUT;
- file_data->term_char = '\n';
- file_data->term_char_enabled = 0;
- file_data->auto_abort = 0;
- 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;
- }
- /*
- * usbtmc_flush - called before file handle is closed
- */
- static int usbtmc_flush(struct file *file, fl_owner_t id)
- {
- struct usbtmc_file_data *file_data;
- struct usbtmc_device_data *data;
- file_data = file->private_data;
- if (file_data == NULL)
- return -ENODEV;
- atomic_set(&file_data->closing, 1);
- data = file_data->data;
- /* wait for io to stop */
- mutex_lock(&data->io_mutex);
- usbtmc_draw_down(file_data);
- spin_lock_irq(&file_data->err_lock);
- file_data->in_status = 0;
- file_data->in_transfer_size = 0;
- file_data->in_urbs_used = 0;
- file_data->out_status = 0;
- file_data->out_transfer_size = 0;
- spin_unlock_irq(&file_data->err_lock);
- wake_up_interruptible_all(&data->waitq);
- mutex_unlock(&data->io_mutex);
- 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_tag(struct usbtmc_device_data *data,
- u8 tag)
- {
- u8 *buffer;
- struct device *dev;
- int rv;
- int n;
- int actual;
- dev = &data->intf->dev;
- buffer = kmalloc(USBTMC_BUFSIZE, 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,
- tag, data->bulk_in,
- buffer, 2, USB_CTRL_GET_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 with tag %02x\n",
- buffer[0], buffer[1]);
- if (buffer[0] == USBTMC_STATUS_FAILED) {
- /* No transfer in progress and the Bulk-OUT FIFO is empty. */
- rv = 0;
- goto exit;
- }
- if (buffer[0] == USBTMC_STATUS_TRANSFER_NOT_IN_PROGRESS) {
- /* The device returns this status if either:
- * - There is a transfer in progress, but the specified bTag
- * does not match.
- * - There is no transfer in progress, but the Bulk-OUT FIFO
- * is not empty.
- */
- rv = -ENOMSG;
- goto exit;
- }
- if (buffer[0] != USBTMC_STATUS_SUCCESS) {
- dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n",
- buffer[0]);
- rv = -EPERM;
- goto exit;
- }
- n = 0;
- usbtmc_abort_bulk_in_status:
- dev_dbg(dev, "Reading from bulk in EP\n");
- /* Data must be present. So use low timeout 300 ms */
- actual = 0;
- rv = usb_bulk_msg(data->usb_dev,
- usb_rcvbulkpipe(data->usb_dev,
- data->bulk_in),
- buffer, USBTMC_BUFSIZE,
- &actual, 300);
- print_hex_dump_debug("usbtmc ", DUMP_PREFIX_NONE, 16, 1,
- buffer, actual, true);
- n++;
- if (rv < 0) {
- dev_err(dev, "usb_bulk_msg returned %d\n", rv);
- if (rv != -ETIMEDOUT)
- goto exit;
- }
- if (actual == USBTMC_BUFSIZE)
- goto usbtmc_abort_bulk_in_status;
- if (n >= USBTMC_MAX_READS_TO_CLEAR_BULK_IN) {
- dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
- USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
- rv = -EPERM;
- goto exit;
- }
- 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,
- USB_CTRL_GET_TIMEOUT);
- if (rv < 0) {
- dev_err(dev, "usb_control_msg returned %d\n", rv);
- goto exit;
- }
- dev_dbg(dev, "CHECK_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, "CHECK_ABORT_BULK_IN returned %x\n", buffer[0]);
- rv = -EPERM;
- goto exit;
- }
- if ((buffer[1] & 1) > 0) {
- /* The device has 1 or more queued packets the Host can read */
- goto usbtmc_abort_bulk_in_status;
- }
- /* The Host must send CHECK_ABORT_BULK_IN_STATUS at a later time. */
- rv = -EAGAIN;
- exit:
- kfree(buffer);
- return rv;
- }
- static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data)
- {
- return usbtmc_ioctl_abort_bulk_in_tag(data, data->bTag_last_read);
- }
- static int usbtmc_ioctl_abort_bulk_out_tag(struct usbtmc_device_data *data,
- u8 tag)
- {
- 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,
- tag, data->bulk_out,
- buffer, 2, USB_CTRL_GET_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:
- /* do not stress device with subsequent requests */
- msleep(50);
- 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,
- USB_CTRL_GET_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 usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data)
- {
- return usbtmc_ioctl_abort_bulk_out_tag(data, data->bTag_last_write);
- }
- 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, USB_CTRL_GET_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_wait_srq(struct usbtmc_file_data *file_data,
- __u32 __user *arg)
- {
- struct usbtmc_device_data *data = file_data->data;
- struct device *dev = &data->intf->dev;
- int rv;
- u32 timeout;
- unsigned long expire;
- if (!data->iin_ep_present) {
- dev_dbg(dev, "no interrupt endpoint present\n");
- return -EFAULT;
- }
- if (get_user(timeout, arg))
- return -EFAULT;
- expire = msecs_to_jiffies(timeout);
- mutex_unlock(&data->io_mutex);
- rv = wait_event_interruptible_timeout(
- data->waitq,
- atomic_read(&file_data->srq_asserted) != 0 ||
- atomic_read(&file_data->closing),
- expire);
- mutex_lock(&data->io_mutex);
- /* Note! disconnect or close could be called in the meantime */
- if (atomic_read(&file_data->closing) || data->zombie)
- rv = -ENODEV;
- if (rv < 0) {
- /* dev can be invalid now! */
- pr_debug("%s - wait interrupted %d\n", __func__, rv);
- return rv;
- }
- if (rv == 0) {
- dev_dbg(dev, "%s - wait timed out\n", __func__);
- return -ETIMEDOUT;
- }
- dev_dbg(dev, "%s - srq asserted\n", __func__);
- return 0;
- }
- 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, USB_CTRL_GET_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;
- }
- static struct urb *usbtmc_create_urb(void)
- {
- const size_t bufsize = USBTMC_BUFSIZE;
- u8 *dmabuf = NULL;
- struct urb *urb = usb_alloc_urb(0, GFP_KERNEL);
- if (!urb)
- return NULL;
- dmabuf = kmalloc(bufsize, GFP_KERNEL);
- if (!dmabuf) {
- usb_free_urb(urb);
- return NULL;
- }
- urb->transfer_buffer = dmabuf;
- urb->transfer_buffer_length = bufsize;
- urb->transfer_flags |= URB_FREE_BUFFER;
- return urb;
- }
- static void usbtmc_read_bulk_cb(struct urb *urb)
- {
- struct usbtmc_file_data *file_data = urb->context;
- int status = urb->status;
- unsigned long flags;
- /* sync/async unlink faults aren't errors */
- if (status) {
- if (!(/* status == -ENOENT || */
- status == -ECONNRESET ||
- status == -EREMOTEIO || /* Short packet */
- status == -ESHUTDOWN))
- dev_err(&file_data->data->intf->dev,
- "%s - nonzero read bulk status received: %d\n",
- __func__, status);
- spin_lock_irqsave(&file_data->err_lock, flags);
- if (!file_data->in_status)
- file_data->in_status = status;
- spin_unlock_irqrestore(&file_data->err_lock, flags);
- }
- spin_lock_irqsave(&file_data->err_lock, flags);
- file_data->in_transfer_size += urb->actual_length;
- dev_dbg(&file_data->data->intf->dev,
- "%s - total size: %u current: %d status: %d\n",
- __func__, file_data->in_transfer_size,
- urb->actual_length, status);
- spin_unlock_irqrestore(&file_data->err_lock, flags);
- usb_anchor_urb(urb, &file_data->in_anchor);
- wake_up_interruptible(&file_data->wait_bulk_in);
- wake_up_interruptible(&file_data->data->waitq);
- }
- static inline bool usbtmc_do_transfer(struct usbtmc_file_data *file_data)
- {
- bool data_or_error;
- spin_lock_irq(&file_data->err_lock);
- data_or_error = !usb_anchor_empty(&file_data->in_anchor)
- || file_data->in_status;
- spin_unlock_irq(&file_data->err_lock);
- dev_dbg(&file_data->data->intf->dev, "%s: returns %d\n", __func__,
- data_or_error);
- return data_or_error;
- }
- static ssize_t usbtmc_generic_read(struct usbtmc_file_data *file_data,
- void __user *user_buffer,
- u32 transfer_size,
- u32 *transferred,
- u32 flags)
- {
- struct usbtmc_device_data *data = file_data->data;
- struct device *dev = &data->intf->dev;
- u32 done = 0;
- u32 remaining;
- const u32 bufsize = USBTMC_BUFSIZE;
- int retval = 0;
- u32 max_transfer_size;
- unsigned long expire;
- int bufcount = 1;
- int again = 0;
- /* mutex already locked */
- *transferred = done;
- max_transfer_size = transfer_size;
- if (flags & USBTMC_FLAG_IGNORE_TRAILER) {
- /* The device may send extra alignment bytes (up to
- * wMaxPacketSize – 1) to avoid sending a zero-length
- * packet
- */
- remaining = transfer_size;
- if ((max_transfer_size % data->wMaxPacketSize) == 0)
- max_transfer_size += (data->wMaxPacketSize - 1);
- } else {
- /* round down to bufsize to avoid truncated data left */
- if (max_transfer_size > bufsize) {
- max_transfer_size =
- roundup(max_transfer_size + 1 - bufsize,
- bufsize);
- }
- remaining = max_transfer_size;
- }
- spin_lock_irq(&file_data->err_lock);
- if (file_data->in_status) {
- /* return the very first error */
- retval = file_data->in_status;
- spin_unlock_irq(&file_data->err_lock);
- goto error;
- }
- if (flags & USBTMC_FLAG_ASYNC) {
- if (usb_anchor_empty(&file_data->in_anchor))
- again = 1;
- if (file_data->in_urbs_used == 0) {
- file_data->in_transfer_size = 0;
- file_data->in_status = 0;
- }
- } else {
- file_data->in_transfer_size = 0;
- file_data->in_status = 0;
- }
- if (max_transfer_size == 0) {
- bufcount = 0;
- } else {
- bufcount = roundup(max_transfer_size, bufsize) / bufsize;
- if (bufcount > file_data->in_urbs_used)
- bufcount -= file_data->in_urbs_used;
- else
- bufcount = 0;
- if (bufcount + file_data->in_urbs_used > MAX_URBS_IN_FLIGHT) {
- bufcount = MAX_URBS_IN_FLIGHT -
- file_data->in_urbs_used;
- }
- }
- spin_unlock_irq(&file_data->err_lock);
- dev_dbg(dev, "%s: requested=%u flags=0x%X size=%u bufs=%d used=%d\n",
- __func__, transfer_size, flags,
- max_transfer_size, bufcount, file_data->in_urbs_used);
- while (bufcount > 0) {
- u8 *dmabuf = NULL;
- struct urb *urb = usbtmc_create_urb();
- if (!urb) {
- retval = -ENOMEM;
- goto error;
- }
- dmabuf = urb->transfer_buffer;
- usb_fill_bulk_urb(urb, data->usb_dev,
- usb_rcvbulkpipe(data->usb_dev, data->bulk_in),
- dmabuf, bufsize,
- usbtmc_read_bulk_cb, file_data);
- usb_anchor_urb(urb, &file_data->submitted);
- retval = usb_submit_urb(urb, GFP_KERNEL);
- /* urb is anchored. We can release our reference. */
- usb_free_urb(urb);
- if (unlikely(retval)) {
- usb_unanchor_urb(urb);
- goto error;
- }
- file_data->in_urbs_used++;
- bufcount--;
- }
- if (again) {
- dev_dbg(dev, "%s: ret=again\n", __func__);
- return -EAGAIN;
- }
- if (user_buffer == NULL)
- return -EINVAL;
- expire = msecs_to_jiffies(file_data->timeout);
- while (max_transfer_size > 0) {
- u32 this_part;
- struct urb *urb = NULL;
- if (!(flags & USBTMC_FLAG_ASYNC)) {
- dev_dbg(dev, "%s: before wait time %lu\n",
- __func__, expire);
- retval = wait_event_interruptible_timeout(
- file_data->wait_bulk_in,
- usbtmc_do_transfer(file_data),
- expire);
- dev_dbg(dev, "%s: wait returned %d\n",
- __func__, retval);
- if (retval <= 0) {
- if (retval == 0)
- retval = -ETIMEDOUT;
- goto error;
- }
- }
- urb = usb_get_from_anchor(&file_data->in_anchor);
- if (!urb) {
- if (!(flags & USBTMC_FLAG_ASYNC)) {
- /* synchronous case: must not happen */
- retval = -EFAULT;
- goto error;
- }
- /* asynchronous case: ready, do not block or wait */
- *transferred = done;
- dev_dbg(dev, "%s: (async) done=%u ret=0\n",
- __func__, done);
- return 0;
- }
- file_data->in_urbs_used--;
- if (max_transfer_size > urb->actual_length)
- max_transfer_size -= urb->actual_length;
- else
- max_transfer_size = 0;
- if (remaining > urb->actual_length)
- this_part = urb->actual_length;
- else
- this_part = remaining;
- print_hex_dump_debug("usbtmc ", DUMP_PREFIX_NONE, 16, 1,
- urb->transfer_buffer, urb->actual_length, true);
- if (copy_to_user(user_buffer + done,
- urb->transfer_buffer, this_part)) {
- usb_free_urb(urb);
- retval = -EFAULT;
- goto error;
- }
- remaining -= this_part;
- done += this_part;
- spin_lock_irq(&file_data->err_lock);
- if (urb->status) {
- /* return the very first error */
- retval = file_data->in_status;
- spin_unlock_irq(&file_data->err_lock);
- usb_free_urb(urb);
- goto error;
- }
- spin_unlock_irq(&file_data->err_lock);
- if (urb->actual_length < bufsize) {
- /* short packet or ZLP received => ready */
- usb_free_urb(urb);
- retval = 1;
- break;
- }
- if (!(flags & USBTMC_FLAG_ASYNC) &&
- max_transfer_size > (bufsize * file_data->in_urbs_used)) {
- /* resubmit, since other buffers still not enough */
- usb_anchor_urb(urb, &file_data->submitted);
- retval = usb_submit_urb(urb, GFP_KERNEL);
- if (unlikely(retval)) {
- usb_unanchor_urb(urb);
- usb_free_urb(urb);
- goto error;
- }
- file_data->in_urbs_used++;
- }
- usb_free_urb(urb);
- retval = 0;
- }
- error:
- *transferred = done;
- dev_dbg(dev, "%s: before kill\n", __func__);
- /* Attention: killing urbs can take long time (2 ms) */
- usb_kill_anchored_urbs(&file_data->submitted);
- dev_dbg(dev, "%s: after kill\n", __func__);
- usb_scuttle_anchored_urbs(&file_data->in_anchor);
- file_data->in_urbs_used = 0;
- file_data->in_status = 0; /* no spinlock needed here */
- dev_dbg(dev, "%s: done=%u ret=%d\n", __func__, done, retval);
- return retval;
- }
- static ssize_t usbtmc_ioctl_generic_read(struct usbtmc_file_data *file_data,
- void __user *arg)
- {
- struct usbtmc_message msg;
- ssize_t retval = 0;
- /* mutex already locked */
- if (copy_from_user(&msg, arg, sizeof(struct usbtmc_message)))
- return -EFAULT;
- retval = usbtmc_generic_read(file_data, msg.message,
- msg.transfer_size, &msg.transferred,
- msg.flags);
- if (put_user(msg.transferred,
- &((struct usbtmc_message __user *)arg)->transferred))
- return -EFAULT;
- return retval;
- }
- static void usbtmc_write_bulk_cb(struct urb *urb)
- {
- struct usbtmc_file_data *file_data = urb->context;
- int wakeup = 0;
- unsigned long flags;
- spin_lock_irqsave(&file_data->err_lock, flags);
- file_data->out_transfer_size += urb->actual_length;
- /* sync/async unlink faults aren't errors */
- if (urb->status) {
- if (!(urb->status == -ENOENT ||
- urb->status == -ECONNRESET ||
- urb->status == -ESHUTDOWN))
- dev_err(&file_data->data->intf->dev,
- "%s - nonzero write bulk status received: %d\n",
- __func__, urb->status);
- if (!file_data->out_status) {
- file_data->out_status = urb->status;
- wakeup = 1;
- }
- }
- spin_unlock_irqrestore(&file_data->err_lock, flags);
- dev_dbg(&file_data->data->intf->dev,
- "%s - write bulk total size: %u\n",
- __func__, file_data->out_transfer_size);
- up(&file_data->limit_write_sem);
- if (usb_anchor_empty(&file_data->submitted) || wakeup)
- wake_up_interruptible(&file_data->data->waitq);
- }
- static ssize_t usbtmc_generic_write(struct usbtmc_file_data *file_data,
- const void __user *user_buffer,
- u32 transfer_size,
- u32 *transferred,
- u32 flags)
- {
- struct usbtmc_device_data *data = file_data->data;
- struct device *dev;
- u32 done = 0;
- u32 remaining;
- unsigned long expire;
- const u32 bufsize = USBTMC_BUFSIZE;
- struct urb *urb = NULL;
- int retval = 0;
- u32 timeout;
- *transferred = 0;
- /* Get pointer to private data structure */
- dev = &data->intf->dev;
- dev_dbg(dev, "%s: size=%u flags=0x%X sema=%u\n",
- __func__, transfer_size, flags,
- file_data->limit_write_sem.count);
- if (flags & USBTMC_FLAG_APPEND) {
- spin_lock_irq(&file_data->err_lock);
- retval = file_data->out_status;
- spin_unlock_irq(&file_data->err_lock);
- if (retval < 0)
- return retval;
- } else {
- spin_lock_irq(&file_data->err_lock);
- file_data->out_transfer_size = 0;
- file_data->out_status = 0;
- spin_unlock_irq(&file_data->err_lock);
- }
- remaining = transfer_size;
- if (remaining > INT_MAX)
- remaining = INT_MAX;
- timeout = file_data->timeout;
- expire = msecs_to_jiffies(timeout);
- while (remaining > 0) {
- u32 this_part, aligned;
- u8 *buffer = NULL;
- if (flags & USBTMC_FLAG_ASYNC) {
- if (down_trylock(&file_data->limit_write_sem)) {
- retval = (done)?(0):(-EAGAIN);
- goto exit;
- }
- } else {
- retval = down_timeout(&file_data->limit_write_sem,
- expire);
- if (retval < 0) {
- retval = -ETIMEDOUT;
- goto error;
- }
- }
- spin_lock_irq(&file_data->err_lock);
- retval = file_data->out_status;
- spin_unlock_irq(&file_data->err_lock);
- if (retval < 0) {
- up(&file_data->limit_write_sem);
- goto error;
- }
- /* prepare next urb to send */
- urb = usbtmc_create_urb();
- if (!urb) {
- retval = -ENOMEM;
- up(&file_data->limit_write_sem);
- goto error;
- }
- buffer = urb->transfer_buffer;
- if (remaining > bufsize)
- this_part = bufsize;
- else
- this_part = remaining;
- if (copy_from_user(buffer, user_buffer + done, this_part)) {
- retval = -EFAULT;
- up(&file_data->limit_write_sem);
- goto error;
- }
- print_hex_dump_debug("usbtmc ", DUMP_PREFIX_NONE,
- 16, 1, buffer, this_part, true);
- /* fill bulk with 32 bit alignment to meet USBTMC specification
- * (size + 3 & ~3) rounds up and simplifies user code
- */
- aligned = (this_part + 3) & ~3;
- dev_dbg(dev, "write(size:%u align:%u done:%u)\n",
- (unsigned int)this_part,
- (unsigned int)aligned,
- (unsigned int)done);
- usb_fill_bulk_urb(urb, data->usb_dev,
- usb_sndbulkpipe(data->usb_dev, data->bulk_out),
- urb->transfer_buffer, aligned,
- usbtmc_write_bulk_cb, file_data);
- usb_anchor_urb(urb, &file_data->submitted);
- retval = usb_submit_urb(urb, GFP_KERNEL);
- if (unlikely(retval)) {
- usb_unanchor_urb(urb);
- up(&file_data->limit_write_sem);
- goto error;
- }
- usb_free_urb(urb);
- urb = NULL; /* urb will be finally released by usb driver */
- remaining -= this_part;
- done += this_part;
- }
- /* All urbs are on the fly */
- if (!(flags & USBTMC_FLAG_ASYNC)) {
- if (!usb_wait_anchor_empty_timeout(&file_data->submitted,
- timeout)) {
- retval = -ETIMEDOUT;
- goto error;
- }
- }
- retval = 0;
- goto exit;
- error:
- usb_kill_anchored_urbs(&file_data->submitted);
- exit:
- usb_free_urb(urb);
- spin_lock_irq(&file_data->err_lock);
- if (!(flags & USBTMC_FLAG_ASYNC))
- done = file_data->out_transfer_size;
- if (!retval && file_data->out_status)
- retval = file_data->out_status;
- spin_unlock_irq(&file_data->err_lock);
- *transferred = done;
- dev_dbg(dev, "%s: done=%u, retval=%d, urbstat=%d\n",
- __func__, done, retval, file_data->out_status);
- return retval;
- }
- static ssize_t usbtmc_ioctl_generic_write(struct usbtmc_file_data *file_data,
- void __user *arg)
- {
- struct usbtmc_message msg;
- ssize_t retval = 0;
- /* mutex already locked */
- if (copy_from_user(&msg, arg, sizeof(struct usbtmc_message)))
- return -EFAULT;
- retval = usbtmc_generic_write(file_data, msg.message,
- msg.transfer_size, &msg.transferred,
- msg.flags);
- if (put_user(msg.transferred,
- &((struct usbtmc_message __user *)arg)->transferred))
- return -EFAULT;
- return retval;
- }
- /*
- * Get the generic write result
- */
- static ssize_t usbtmc_ioctl_write_result(struct usbtmc_file_data *file_data,
- void __user *arg)
- {
- u32 transferred;
- int retval;
- spin_lock_irq(&file_data->err_lock);
- transferred = file_data->out_transfer_size;
- retval = file_data->out_status;
- spin_unlock_irq(&file_data->err_lock);
- if (put_user(transferred, (__u32 __user *)arg))
- return -EFAULT;
- return retval;
- }
- /*
- * 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,
- u32 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, "%s returned %d\n",
- __func__, retval);
- return retval;
- }
- 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;
- const u32 bufsize = USBTMC_BUFSIZE;
- u32 n_characters;
- u8 *buffer;
- int actual;
- u32 done = 0;
- u32 remaining;
- int retval;
- /* Get pointer to private data structure */
- file_data = filp->private_data;
- data = file_data->data;
- dev = &data->intf->dev;
- buffer = kmalloc(bufsize, GFP_KERNEL);
- if (!buffer)
- return -ENOMEM;
- mutex_lock(&data->io_mutex);
- if (data->zombie) {
- retval = -ENODEV;
- goto exit;
- }
- if (count > INT_MAX)
- count = INT_MAX;
- dev_dbg(dev, "%s(count:%zu)\n", __func__, count);
- retval = send_request_dev_dep_msg_in(file_data, count);
- if (retval < 0) {
- if (file_data->auto_abort)
- usbtmc_ioctl_abort_bulk_out(data);
- goto exit;
- }
- /* Loop until we have fetched everything we requested */
- remaining = count;
- actual = 0;
- /* Send bulk URB */
- retval = usb_bulk_msg(data->usb_dev,
- usb_rcvbulkpipe(data->usb_dev,
- data->bulk_in),
- buffer, bufsize, &actual,
- file_data->timeout);
- dev_dbg(dev, "%s: bulk_msg retval(%u), actual(%d)\n",
- __func__, retval, actual);
- /* Store bTag (in case we need to abort) */
- data->bTag_last_read = data->bTag;
- if (retval < 0) {
- if (file_data->auto_abort)
- usbtmc_ioctl_abort_bulk_in(data);
- goto exit;
- }
- /* 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 (file_data->auto_abort)
- usbtmc_ioctl_abort_bulk_in(data);
- goto exit;
- }
- if (buffer[0] != 2) {
- dev_err(dev, "Device sent reply with wrong MsgID: %u != 2\n",
- buffer[0]);
- if (file_data->auto_abort)
- usbtmc_ioctl_abort_bulk_in(data);
- goto exit;
- }
- if (buffer[1] != data->bTag_last_write) {
- dev_err(dev, "Device sent reply with wrong bTag: %u != %u\n",
- buffer[1], data->bTag_last_write);
- if (file_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);
- file_data->bmTransferAttributes = buffer[8];
- dev_dbg(dev, "Bulk-IN header: N_characters(%u), bTransAttr(%u)\n",
- n_characters, buffer[8]);
- if (n_characters > remaining) {
- dev_err(dev, "Device wants to return more data than requested: %u > %zu\n",
- n_characters, count);
- if (file_data->auto_abort)
- usbtmc_ioctl_abort_bulk_in(data);
- goto exit;
- }
- print_hex_dump_debug("usbtmc ", DUMP_PREFIX_NONE,
- 16, 1, buffer, actual, true);
- remaining = n_characters;
- /* Remove the USBTMC header */
- actual -= USBTMC_HEADER_SIZE;
- /* Remove padding if it exists */
- if (actual > remaining)
- actual = remaining;
- remaining -= actual;
- /* Copy buffer to user space */
- if (copy_to_user(buf, &buffer[USBTMC_HEADER_SIZE], actual)) {
- /* There must have been an addressing problem */
- retval = -EFAULT;
- goto exit;
- }
- if ((actual + USBTMC_HEADER_SIZE) == bufsize) {
- retval = usbtmc_generic_read(file_data, buf + actual,
- remaining,
- &done,
- USBTMC_FLAG_IGNORE_TRAILER);
- if (retval < 0)
- 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;
- struct urb *urb = NULL;
- ssize_t retval = 0;
- u8 *buffer;
- u32 remaining, done;
- u32 transfersize, aligned, buflen;
- file_data = filp->private_data;
- data = file_data->data;
- mutex_lock(&data->io_mutex);
- if (data->zombie) {
- retval = -ENODEV;
- goto exit;
- }
- done = 0;
- spin_lock_irq(&file_data->err_lock);
- file_data->out_transfer_size = 0;
- file_data->out_status = 0;
- spin_unlock_irq(&file_data->err_lock);
- if (!count)
- goto exit;
- if (down_trylock(&file_data->limit_write_sem)) {
- /* previous calls were async */
- retval = -EBUSY;
- goto exit;
- }
- urb = usbtmc_create_urb();
- if (!urb) {
- retval = -ENOMEM;
- up(&file_data->limit_write_sem);
- goto exit;
- }
- buffer = urb->transfer_buffer;
- buflen = urb->transfer_buffer_length;
- if (count > INT_MAX) {
- transfersize = INT_MAX;
- buffer[8] = 0;
- } else {
- transfersize = count;
- 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] = transfersize >> 0;
- buffer[5] = transfersize >> 8;
- buffer[6] = transfersize >> 16;
- buffer[7] = transfersize >> 24;
- /* buffer[8] is set above... */
- buffer[9] = 0; /* Reserved */
- buffer[10] = 0; /* Reserved */
- buffer[11] = 0; /* Reserved */
- remaining = transfersize;
- if (transfersize + USBTMC_HEADER_SIZE > buflen) {
- transfersize = buflen - USBTMC_HEADER_SIZE;
- aligned = buflen;
- } else {
- aligned = (transfersize + (USBTMC_HEADER_SIZE + 3)) & ~3;
- }
- if (copy_from_user(&buffer[USBTMC_HEADER_SIZE], buf, transfersize)) {
- retval = -EFAULT;
- up(&file_data->limit_write_sem);
- goto exit;
- }
- dev_dbg(&data->intf->dev, "%s(size:%u align:%u)\n", __func__,
- (unsigned int)transfersize, (unsigned int)aligned);
- print_hex_dump_debug("usbtmc ", DUMP_PREFIX_NONE,
- 16, 1, buffer, aligned, true);
- usb_fill_bulk_urb(urb, data->usb_dev,
- usb_sndbulkpipe(data->usb_dev, data->bulk_out),
- urb->transfer_buffer, aligned,
- usbtmc_write_bulk_cb, file_data);
- usb_anchor_urb(urb, &file_data->submitted);
- retval = usb_submit_urb(urb, GFP_KERNEL);
- if (unlikely(retval)) {
- usb_unanchor_urb(urb);
- up(&file_data->limit_write_sem);
- goto exit;
- }
- remaining -= transfersize;
- data->bTag_last_write = data->bTag;
- data->bTag++;
- if (!data->bTag)
- data->bTag++;
- /* call generic_write even when remaining = 0 */
- retval = usbtmc_generic_write(file_data, buf + transfersize, remaining,
- &done, USBTMC_FLAG_APPEND);
- /* truncate alignment bytes */
- if (done > remaining)
- done = remaining;
- /*add size of first urb*/
- done += transfersize;
- if (retval < 0) {
- usb_kill_anchored_urbs(&file_data->submitted);
- dev_err(&data->intf->dev,
- "Unable to send data, error %d\n", (int)retval);
- if (file_data->auto_abort)
- usbtmc_ioctl_abort_bulk_out(data);
- goto exit;
- }
- retval = done;
- exit:
- usb_free_urb(urb);
- mutex_unlock(&data->io_mutex);
- return retval;
- }
- static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
- {
- struct device *dev;
- u8 *buffer;
- int rv;
- int n;
- int actual = 0;
- dev = &data->intf->dev;
- dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
- buffer = kmalloc(USBTMC_BUFSIZE, 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, USB_CTRL_GET_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;
- }
- 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, USB_CTRL_GET_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) != 0) {
- do {
- dev_dbg(dev, "Reading from bulk in EP\n");
- actual = 0;
- rv = usb_bulk_msg(data->usb_dev,
- usb_rcvbulkpipe(data->usb_dev,
- data->bulk_in),
- buffer, USBTMC_BUFSIZE,
- &actual, USB_CTRL_GET_TIMEOUT);
- print_hex_dump_debug("usbtmc ", DUMP_PREFIX_NONE,
- 16, 1, buffer, actual, true);
- n++;
- if (rv < 0) {
- dev_err(dev, "usb_control_msg returned %d\n",
- rv);
- goto exit;
- }
- } while ((actual == USBTMC_BUFSIZE) &&
- (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
- } else {
- /* do not stress device with subsequent requests */
- msleep(50);
- n++;
- }
- if (n >= USBTMC_MAX_READS_TO_CLEAR_BULK_IN) {
- 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_clear_halt 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, "%s returned %d\n", __func__, rv);
- return rv;
- }
- 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, "%s returned %d\n", __func__, rv);
- return rv;
- }
- static int usbtmc_ioctl_cancel_io(struct usbtmc_file_data *file_data)
- {
- spin_lock_irq(&file_data->err_lock);
- file_data->in_status = -ECANCELED;
- file_data->out_status = -ECANCELED;
- spin_unlock_irq(&file_data->err_lock);
- usb_kill_anchored_urbs(&file_data->submitted);
- return 0;
- }
- static int usbtmc_ioctl_cleanup_io(struct usbtmc_file_data *file_data)
- {
- usb_kill_anchored_urbs(&file_data->submitted);
- usb_scuttle_anchored_urbs(&file_data->in_anchor);
- spin_lock_irq(&file_data->err_lock);
- file_data->in_status = 0;
- file_data->in_transfer_size = 0;
- file_data->out_status = 0;
- file_data->out_transfer_size = 0;
- spin_unlock_irq(&file_data->err_lock);
- file_data->in_urbs_used = 0;
- 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, USB_CTRL_GET_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 *usbtmc_attrs[] = {
- &dev_attr_interface_capabilities.attr,
- &dev_attr_device_capabilities.attr,
- &dev_attr_usb488_interface_capabilities.attr,
- &dev_attr_usb488_device_capabilities.attr,
- NULL,
- };
- ATTRIBUTE_GROUPS(usbtmc);
- 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, USB_CTRL_GET_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 int usbtmc_ioctl_request(struct usbtmc_device_data *data,
- void __user *arg)
- {
- struct device *dev = &data->intf->dev;
- struct usbtmc_ctrlrequest request;
- u8 *buffer = NULL;
- int rv;
- unsigned long res;
- res = copy_from_user(&request, arg, sizeof(struct usbtmc_ctrlrequest));
- if (res)
- return -EFAULT;
- if (request.req.wLength > USBTMC_BUFSIZE)
- return -EMSGSIZE;
- if (request.req.wLength) {
- buffer = kmalloc(request.req.wLength, GFP_KERNEL);
- if (!buffer)
- return -ENOMEM;
- if ((request.req.bRequestType & USB_DIR_IN) == 0) {
- /* Send control data to device */
- res = copy_from_user(buffer, request.data,
- request.req.wLength);
- if (res) {
- rv = -EFAULT;
- goto exit;
- }
- }
- }
- rv = usb_control_msg(data->usb_dev,
- usb_rcvctrlpipe(data->usb_dev, 0),
- request.req.bRequest,
- request.req.bRequestType,
- request.req.wValue,
- request.req.wIndex,
- buffer, request.req.wLength, USB_CTRL_GET_TIMEOUT);
- if (rv < 0) {
- dev_err(dev, "%s failed %d\n", __func__, rv);
- goto exit;
- }
- if (rv && (request.req.bRequestType & USB_DIR_IN)) {
- /* Read control data from device */
- res = copy_to_user(request.data, buffer, rv);
- if (res)
- rv = -EFAULT;
- }
- 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;
- __u8 tmp_byte;
- 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_CTRL_REQUEST:
- retval = usbtmc_ioctl_request(data, (void __user *)arg);
- 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 USBTMC_IOCTL_WRITE:
- retval = usbtmc_ioctl_generic_write(file_data,
- (void __user *)arg);
- break;
- case USBTMC_IOCTL_READ:
- retval = usbtmc_ioctl_generic_read(file_data,
- (void __user *)arg);
- break;
- case USBTMC_IOCTL_WRITE_RESULT:
- retval = usbtmc_ioctl_write_result(file_data,
- (void __user *)arg);
- break;
- case USBTMC_IOCTL_API_VERSION:
- retval = put_user(USBTMC_API_VERSION,
- (__u32 __user *)arg);
- break;
- case USBTMC488_IOCTL_GET_CAPS:
- retval = put_user(data->usb488_caps,
- (unsigned char __user *)arg);
- 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;
- case USBTMC488_IOCTL_WAIT_SRQ:
- retval = usbtmc488_ioctl_wait_srq(file_data,
- (__u32 __user *)arg);
- break;
- case USBTMC_IOCTL_MSG_IN_ATTR:
- retval = put_user(file_data->bmTransferAttributes,
- (__u8 __user *)arg);
- break;
- case USBTMC_IOCTL_AUTO_ABORT:
- retval = get_user(tmp_byte, (unsigned char __user *)arg);
- if (retval == 0)
- file_data->auto_abort = !!tmp_byte;
- break;
- case USBTMC_IOCTL_CANCEL_IO:
- retval = usbtmc_ioctl_cancel_io(file_data);
- break;
- case USBTMC_IOCTL_CLEANUP_IO:
- retval = usbtmc_ioctl_cleanup_io(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);
- /* Note that EPOLLPRI is now assigned to SRQ, and
- * EPOLLIN|EPOLLRDNORM to normal read data.
- */
- mask = 0;
- if (atomic_read(&file_data->srq_asserted))
- mask |= EPOLLPRI;
- /* Note that the anchor submitted includes all urbs for BULK IN
- * and OUT. So EPOLLOUT is signaled when BULK OUT is empty and
- * all BULK IN urbs are completed and moved to in_anchor.
- */
- if (usb_anchor_empty(&file_data->submitted))
- mask |= (EPOLLOUT | EPOLLWRNORM);
- if (!usb_anchor_empty(&file_data->in_anchor))
- mask |= (EPOLLIN | EPOLLRDNORM);
- spin_lock_irq(&file_data->err_lock);
- if (file_data->in_status || file_data->out_status)
- mask |= EPOLLERR;
- spin_unlock_irq(&file_data->err_lock);
- dev_dbg(&data->intf->dev, "poll mask = %x\n", mask);
- 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,
- .flush = usbtmc_flush,
- .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 */
- default:
- /* urb terminated, clean up */
- dev_dbg(dev, "urb terminated, status: %d\n", status);
- return;
- }
- 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);
- data->iin_buffer = NULL;
- usb_free_urb(data->iin_urb);
- data->iin_urb = NULL;
- 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;
- /* 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;
- }
- retcode = -EINVAL;
- data->bulk_in = bulk_in->bEndpointAddress;
- data->wMaxPacketSize = usb_endpoint_maxp(bulk_in);
- if (!data->wMaxPacketSize)
- goto err_put;
- 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");
- 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 = 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:
- 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);
- struct list_head *elem;
- usb_deregister_dev(intf, &usbtmc_class);
- mutex_lock(&data->io_mutex);
- data->zombie = 1;
- wake_up_interruptible_all(&data->waitq);
- list_for_each(elem, &data->file_list) {
- struct usbtmc_file_data *file_data;
- file_data = list_entry(elem,
- struct usbtmc_file_data,
- file_elem);
- usb_kill_anchored_urbs(&file_data->submitted);
- usb_scuttle_anchored_urbs(&file_data->in_anchor);
- }
- mutex_unlock(&data->io_mutex);
- usbtmc_free_int(data);
- kref_put(&data->kref, usbtmc_delete);
- }
- static void usbtmc_draw_down(struct usbtmc_file_data *file_data)
- {
- int time;
- time = usb_wait_anchor_empty_timeout(&file_data->submitted, 1000);
- if (!time)
- usb_kill_anchored_urbs(&file_data->submitted);
- usb_scuttle_anchored_urbs(&file_data->in_anchor);
- }
- static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message)
- {
- struct usbtmc_device_data *data = usb_get_intfdata(intf);
- struct list_head *elem;
- if (!data)
- return 0;
- mutex_lock(&data->io_mutex);
- list_for_each(elem, &data->file_list) {
- struct usbtmc_file_data *file_data;
- file_data = list_entry(elem,
- struct usbtmc_file_data,
- file_elem);
- usbtmc_draw_down(file_data);
- }
- if (data->iin_ep_present && data->iin_urb)
- usb_kill_urb(data->iin_urb);
- mutex_unlock(&data->io_mutex);
- return 0;
- }
- static int usbtmc_resume(struct usb_interface *intf)
- {
- struct usbtmc_device_data *data = usb_get_intfdata(intf);
- int retcode = 0;
- if (data->iin_ep_present && data->iin_urb)
- retcode = usb_submit_urb(data->iin_urb, GFP_KERNEL);
- if (retcode)
- dev_err(&intf->dev, "Failed to submit iin_urb\n");
- return retcode;
- }
- static int usbtmc_pre_reset(struct usb_interface *intf)
- {
- struct usbtmc_device_data *data = usb_get_intfdata(intf);
- struct list_head *elem;
- if (!data)
- return 0;
- mutex_lock(&data->io_mutex);
- list_for_each(elem, &data->file_list) {
- struct usbtmc_file_data *file_data;
- file_data = list_entry(elem,
- struct usbtmc_file_data,
- file_elem);
- usbtmc_ioctl_cancel_io(file_data);
- }
- return 0;
- }
- static int usbtmc_post_reset(struct usb_interface *intf)
- {
- struct usbtmc_device_data *data = usb_get_intfdata(intf);
- mutex_unlock(&data->io_mutex);
- 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,
- .pre_reset = usbtmc_pre_reset,
- .post_reset = usbtmc_post_reset,
- .dev_groups = usbtmc_groups,
- };
- module_usb_driver(usbtmc_driver);
- MODULE_LICENSE("GPL");
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