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baf12d6dde
All T&M instruments should also work with rigol_quirk = 1 code path. So remove unnecessary code in rigol_quirk = 0 code path to simplify the driver. Tested-by: Dave Penkler <dpenkler@gmail.com> Reviewed-by: Steve Bayless <steve_bayless@keysight.com> Signed-off-by: Guido Kiener <guido.kiener@rohde-schwarz.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1484 lines
35 KiB
C
1484 lines
35 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/**
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* drivers/usb/class/usbtmc.c - USB Test & Measurement class driver
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*
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* Copyright (C) 2007 Stefan Kopp, Gechingen, Germany
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* Copyright (C) 2008 Novell, Inc.
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* Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include <linux/kref.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/mutex.h>
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#include <linux/usb.h>
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#include <linux/usb/tmc.h>
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#define USBTMC_HEADER_SIZE 12
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#define USBTMC_MINOR_BASE 176
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/*
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* Size of driver internal IO buffer. Must be multiple of 4 and at least as
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* large as wMaxPacketSize (which is usually 512 bytes).
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*/
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#define USBTMC_SIZE_IOBUFFER 2048
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/* Default USB timeout (in milliseconds) */
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#define USBTMC_TIMEOUT 5000
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/*
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* Maximum number of read cycles to empty bulk in endpoint during CLEAR and
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* ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short
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* packet is never read.
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*/
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#define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100
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static const struct usb_device_id usbtmc_devices[] = {
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{ USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), },
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{ USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), },
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{ 0, } /* terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, usbtmc_devices);
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/*
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* This structure is the capabilities for the device
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* See section 4.2.1.8 of the USBTMC specification,
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* and section 4.2.2 of the USBTMC usb488 subclass
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* specification for details.
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*/
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struct usbtmc_dev_capabilities {
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__u8 interface_capabilities;
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__u8 device_capabilities;
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__u8 usb488_interface_capabilities;
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__u8 usb488_device_capabilities;
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};
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/* This structure holds private data for each USBTMC device. One copy is
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* allocated for each USBTMC device in the driver's probe function.
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*/
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struct usbtmc_device_data {
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const struct usb_device_id *id;
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struct usb_device *usb_dev;
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struct usb_interface *intf;
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unsigned int bulk_in;
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unsigned int bulk_out;
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u8 bTag;
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u8 bTag_last_write; /* needed for abort */
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u8 bTag_last_read; /* needed for abort */
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/* data for interrupt in endpoint handling */
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u8 bNotify1;
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u8 bNotify2;
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u16 ifnum;
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u8 iin_bTag;
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u8 *iin_buffer;
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atomic_t iin_data_valid;
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unsigned int iin_ep;
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int iin_ep_present;
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int iin_interval;
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struct urb *iin_urb;
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u16 iin_wMaxPacketSize;
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atomic_t srq_asserted;
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/* coalesced usb488_caps from usbtmc_dev_capabilities */
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__u8 usb488_caps;
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/* attributes from the USB TMC spec for this device */
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u8 TermChar;
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bool TermCharEnabled;
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bool auto_abort;
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bool zombie; /* fd of disconnected device */
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struct usbtmc_dev_capabilities capabilities;
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struct kref kref;
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struct mutex io_mutex; /* only one i/o function running at a time */
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wait_queue_head_t waitq;
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struct fasync_struct *fasync;
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};
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#define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
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/* Forward declarations */
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static struct usb_driver usbtmc_driver;
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static void usbtmc_delete(struct kref *kref)
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{
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struct usbtmc_device_data *data = to_usbtmc_data(kref);
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usb_put_dev(data->usb_dev);
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kfree(data);
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}
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static int usbtmc_open(struct inode *inode, struct file *filp)
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{
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struct usb_interface *intf;
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struct usbtmc_device_data *data;
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int retval = 0;
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intf = usb_find_interface(&usbtmc_driver, iminor(inode));
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if (!intf) {
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pr_err("can not find device for minor %d", iminor(inode));
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return -ENODEV;
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}
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data = usb_get_intfdata(intf);
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/* Protect reference to data from file structure until release */
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kref_get(&data->kref);
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/* Store pointer in file structure's private data field */
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filp->private_data = data;
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return retval;
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}
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static int usbtmc_release(struct inode *inode, struct file *file)
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{
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struct usbtmc_device_data *data = file->private_data;
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kref_put(&data->kref, usbtmc_delete);
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return 0;
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}
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static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data)
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{
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u8 *buffer;
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struct device *dev;
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int rv;
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int n;
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int actual;
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struct usb_host_interface *current_setting;
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int max_size;
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dev = &data->intf->dev;
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buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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rv = usb_control_msg(data->usb_dev,
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usb_rcvctrlpipe(data->usb_dev, 0),
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USBTMC_REQUEST_INITIATE_ABORT_BULK_IN,
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
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data->bTag_last_read, data->bulk_in,
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buffer, 2, USBTMC_TIMEOUT);
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if (rv < 0) {
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dev_err(dev, "usb_control_msg returned %d\n", rv);
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goto exit;
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}
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dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
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if (buffer[0] == USBTMC_STATUS_FAILED) {
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rv = 0;
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goto exit;
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}
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if (buffer[0] != USBTMC_STATUS_SUCCESS) {
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dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n",
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buffer[0]);
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rv = -EPERM;
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goto exit;
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}
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max_size = 0;
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current_setting = data->intf->cur_altsetting;
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for (n = 0; n < current_setting->desc.bNumEndpoints; n++)
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if (current_setting->endpoint[n].desc.bEndpointAddress ==
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data->bulk_in)
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max_size = usb_endpoint_maxp(¤t_setting->endpoint[n].desc);
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if (max_size == 0) {
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dev_err(dev, "Couldn't get wMaxPacketSize\n");
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rv = -EPERM;
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goto exit;
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}
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dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size);
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n = 0;
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do {
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dev_dbg(dev, "Reading from bulk in EP\n");
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rv = usb_bulk_msg(data->usb_dev,
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usb_rcvbulkpipe(data->usb_dev,
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data->bulk_in),
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buffer, USBTMC_SIZE_IOBUFFER,
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&actual, USBTMC_TIMEOUT);
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n++;
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if (rv < 0) {
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dev_err(dev, "usb_bulk_msg returned %d\n", rv);
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goto exit;
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}
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} while ((actual == max_size) &&
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(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
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if (actual == max_size) {
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dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
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USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
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rv = -EPERM;
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goto exit;
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}
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n = 0;
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usbtmc_abort_bulk_in_status:
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rv = usb_control_msg(data->usb_dev,
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usb_rcvctrlpipe(data->usb_dev, 0),
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USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS,
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
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0, data->bulk_in, buffer, 0x08,
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USBTMC_TIMEOUT);
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if (rv < 0) {
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dev_err(dev, "usb_control_msg returned %d\n", rv);
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goto exit;
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}
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dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
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if (buffer[0] == USBTMC_STATUS_SUCCESS) {
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rv = 0;
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goto exit;
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}
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if (buffer[0] != USBTMC_STATUS_PENDING) {
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dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
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rv = -EPERM;
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goto exit;
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}
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if (buffer[1] == 1)
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do {
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dev_dbg(dev, "Reading from bulk in EP\n");
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rv = usb_bulk_msg(data->usb_dev,
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usb_rcvbulkpipe(data->usb_dev,
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data->bulk_in),
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buffer, USBTMC_SIZE_IOBUFFER,
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&actual, USBTMC_TIMEOUT);
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n++;
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if (rv < 0) {
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dev_err(dev, "usb_bulk_msg returned %d\n", rv);
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goto exit;
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}
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} while ((actual == max_size) &&
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(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
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if (actual == max_size) {
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dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
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USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
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rv = -EPERM;
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goto exit;
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}
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goto usbtmc_abort_bulk_in_status;
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exit:
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kfree(buffer);
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return rv;
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}
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static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data)
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{
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struct device *dev;
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u8 *buffer;
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int rv;
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int n;
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dev = &data->intf->dev;
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buffer = kmalloc(8, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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rv = usb_control_msg(data->usb_dev,
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usb_rcvctrlpipe(data->usb_dev, 0),
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USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT,
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
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data->bTag_last_write, data->bulk_out,
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buffer, 2, USBTMC_TIMEOUT);
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if (rv < 0) {
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dev_err(dev, "usb_control_msg returned %d\n", rv);
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goto exit;
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}
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dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]);
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if (buffer[0] != USBTMC_STATUS_SUCCESS) {
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dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n",
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buffer[0]);
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rv = -EPERM;
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goto exit;
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}
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n = 0;
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usbtmc_abort_bulk_out_check_status:
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rv = usb_control_msg(data->usb_dev,
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usb_rcvctrlpipe(data->usb_dev, 0),
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USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS,
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
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0, data->bulk_out, buffer, 0x08,
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USBTMC_TIMEOUT);
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n++;
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if (rv < 0) {
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dev_err(dev, "usb_control_msg returned %d\n", rv);
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goto exit;
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}
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dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]);
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if (buffer[0] == USBTMC_STATUS_SUCCESS)
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goto usbtmc_abort_bulk_out_clear_halt;
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if ((buffer[0] == USBTMC_STATUS_PENDING) &&
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(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN))
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goto usbtmc_abort_bulk_out_check_status;
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rv = -EPERM;
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goto exit;
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usbtmc_abort_bulk_out_clear_halt:
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rv = usb_clear_halt(data->usb_dev,
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usb_sndbulkpipe(data->usb_dev, data->bulk_out));
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if (rv < 0) {
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dev_err(dev, "usb_control_msg returned %d\n", rv);
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goto exit;
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}
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rv = 0;
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exit:
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kfree(buffer);
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return rv;
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}
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static int usbtmc488_ioctl_read_stb(struct usbtmc_device_data *data,
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void __user *arg)
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{
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struct device *dev = &data->intf->dev;
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u8 *buffer;
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u8 tag;
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__u8 stb;
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int rv;
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dev_dbg(dev, "Enter ioctl_read_stb iin_ep_present: %d\n",
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data->iin_ep_present);
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buffer = kmalloc(8, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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atomic_set(&data->iin_data_valid, 0);
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/* must issue read_stb before using poll or select */
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atomic_set(&data->srq_asserted, 0);
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rv = usb_control_msg(data->usb_dev,
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usb_rcvctrlpipe(data->usb_dev, 0),
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USBTMC488_REQUEST_READ_STATUS_BYTE,
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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data->iin_bTag,
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data->ifnum,
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buffer, 0x03, USBTMC_TIMEOUT);
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if (rv < 0) {
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dev_err(dev, "stb usb_control_msg returned %d\n", rv);
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goto exit;
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}
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if (buffer[0] != USBTMC_STATUS_SUCCESS) {
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dev_err(dev, "control status returned %x\n", buffer[0]);
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rv = -EIO;
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goto exit;
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}
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if (data->iin_ep_present) {
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rv = wait_event_interruptible_timeout(
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data->waitq,
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atomic_read(&data->iin_data_valid) != 0,
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USBTMC_TIMEOUT);
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if (rv < 0) {
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dev_dbg(dev, "wait interrupted %d\n", rv);
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goto exit;
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}
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|
|
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if (rv == 0) {
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dev_dbg(dev, "wait timed out\n");
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rv = -ETIME;
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goto exit;
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}
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|
|
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tag = data->bNotify1 & 0x7f;
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if (tag != data->iin_bTag) {
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dev_err(dev, "expected bTag %x got %x\n",
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data->iin_bTag, tag);
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}
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|
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stb = data->bNotify2;
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} else {
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stb = buffer[2];
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}
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rv = copy_to_user(arg, &stb, sizeof(stb));
|
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if (rv)
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rv = -EFAULT;
|
|
|
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exit:
|
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/* bump interrupt bTag */
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data->iin_bTag += 1;
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if (data->iin_bTag > 127)
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/* 1 is for SRQ see USBTMC-USB488 subclass spec section 4.3.1 */
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data->iin_bTag = 2;
|
|
|
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kfree(buffer);
|
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return rv;
|
|
}
|
|
|
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static int usbtmc488_ioctl_simple(struct usbtmc_device_data *data,
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void __user *arg, unsigned int cmd)
|
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{
|
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struct device *dev = &data->intf->dev;
|
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__u8 val;
|
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u8 *buffer;
|
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u16 wValue;
|
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int rv;
|
|
|
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if (!(data->usb488_caps & USBTMC488_CAPABILITY_SIMPLE))
|
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return -EINVAL;
|
|
|
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buffer = kmalloc(8, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
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if (cmd == USBTMC488_REQUEST_REN_CONTROL) {
|
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rv = copy_from_user(&val, arg, sizeof(val));
|
|
if (rv) {
|
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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,
|
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
wValue,
|
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data->ifnum,
|
|
buffer, 0x01, USBTMC_TIMEOUT);
|
|
if (rv < 0) {
|
|
dev_err(dev, "simple usb_control_msg failed %d\n", rv);
|
|
goto exit;
|
|
} else if (rv != 1) {
|
|
dev_warn(dev, "simple usb_control_msg returned %d\n", rv);
|
|
rv = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
|
|
dev_err(dev, "simple control status returned %x\n", buffer[0]);
|
|
rv = -EIO;
|
|
goto exit;
|
|
}
|
|
rv = 0;
|
|
|
|
exit:
|
|
kfree(buffer);
|
|
return rv;
|
|
}
|
|
|
|
/*
|
|
* Sends a REQUEST_DEV_DEP_MSG_IN message on the Bulk-OUT endpoint.
|
|
* @transfer_size: number of bytes to request from the device.
|
|
*
|
|
* See the USBTMC specification, Table 4.
|
|
*
|
|
* Also updates bTag_last_write.
|
|
*/
|
|
static int send_request_dev_dep_msg_in(struct usbtmc_device_data *data, size_t transfer_size)
|
|
{
|
|
int retval;
|
|
u8 *buffer;
|
|
int actual;
|
|
|
|
buffer = kmalloc(USBTMC_HEADER_SIZE, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
/* Setup IO buffer for REQUEST_DEV_DEP_MSG_IN message
|
|
* Refer to class specs for details
|
|
*/
|
|
buffer[0] = 2;
|
|
buffer[1] = data->bTag;
|
|
buffer[2] = ~data->bTag;
|
|
buffer[3] = 0; /* Reserved */
|
|
buffer[4] = transfer_size >> 0;
|
|
buffer[5] = transfer_size >> 8;
|
|
buffer[6] = transfer_size >> 16;
|
|
buffer[7] = transfer_size >> 24;
|
|
buffer[8] = data->TermCharEnabled * 2;
|
|
/* Use term character? */
|
|
buffer[9] = data->TermChar;
|
|
buffer[10] = 0; /* Reserved */
|
|
buffer[11] = 0; /* Reserved */
|
|
|
|
/* Send bulk URB */
|
|
retval = usb_bulk_msg(data->usb_dev,
|
|
usb_sndbulkpipe(data->usb_dev,
|
|
data->bulk_out),
|
|
buffer, USBTMC_HEADER_SIZE, &actual, USBTMC_TIMEOUT);
|
|
|
|
/* Store bTag (in case we need to abort) */
|
|
data->bTag_last_write = data->bTag;
|
|
|
|
/* Increment bTag -- and increment again if zero */
|
|
data->bTag++;
|
|
if (!data->bTag)
|
|
data->bTag++;
|
|
|
|
kfree(buffer);
|
|
if (retval < 0) {
|
|
dev_err(&data->intf->dev, "usb_bulk_msg in send_request_dev_dep_msg_in() returned %d\n", retval);
|
|
return retval;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t usbtmc_read(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *f_pos)
|
|
{
|
|
struct usbtmc_device_data *data;
|
|
struct device *dev;
|
|
u32 n_characters;
|
|
u8 *buffer;
|
|
int actual;
|
|
size_t done;
|
|
size_t remaining;
|
|
int retval;
|
|
size_t this_part;
|
|
|
|
/* Get pointer to private data structure */
|
|
data = filp->private_data;
|
|
dev = &data->intf->dev;
|
|
|
|
buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&data->io_mutex);
|
|
if (data->zombie) {
|
|
retval = -ENODEV;
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "usb_bulk_msg_in: count(%zu)\n", count);
|
|
|
|
retval = send_request_dev_dep_msg_in(data, count);
|
|
|
|
if (retval < 0) {
|
|
if (data->auto_abort)
|
|
usbtmc_ioctl_abort_bulk_out(data);
|
|
goto exit;
|
|
}
|
|
|
|
/* Loop until we have fetched everything we requested */
|
|
remaining = count;
|
|
this_part = remaining;
|
|
done = 0;
|
|
|
|
while (remaining > 0) {
|
|
/* Send bulk URB */
|
|
retval = usb_bulk_msg(data->usb_dev,
|
|
usb_rcvbulkpipe(data->usb_dev,
|
|
data->bulk_in),
|
|
buffer, USBTMC_SIZE_IOBUFFER, &actual,
|
|
USBTMC_TIMEOUT);
|
|
|
|
dev_dbg(dev, "usb_bulk_msg: retval(%u), done(%zu), remaining(%zu), actual(%d)\n", retval, done, remaining, actual);
|
|
|
|
/* Store bTag (in case we need to abort) */
|
|
data->bTag_last_read = data->bTag;
|
|
|
|
if (retval < 0) {
|
|
dev_dbg(dev, "Unable to read data, error %d\n", retval);
|
|
if (data->auto_abort)
|
|
usbtmc_ioctl_abort_bulk_in(data);
|
|
goto exit;
|
|
}
|
|
|
|
/* Parse header in first packet */
|
|
if (done == 0) {
|
|
/* 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_device_data *data;
|
|
u8 *buffer;
|
|
int retval;
|
|
int actual;
|
|
unsigned long int n_bytes;
|
|
int remaining;
|
|
int done;
|
|
int this_part;
|
|
|
|
data = filp->private_data;
|
|
|
|
buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&data->io_mutex);
|
|
if (data->zombie) {
|
|
retval = -ENODEV;
|
|
goto exit;
|
|
}
|
|
|
|
remaining = count;
|
|
done = 0;
|
|
|
|
while (remaining > 0) {
|
|
if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE) {
|
|
this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE;
|
|
buffer[8] = 0;
|
|
} else {
|
|
this_part = remaining;
|
|
buffer[8] = 1;
|
|
}
|
|
|
|
/* Setup IO buffer for DEV_DEP_MSG_OUT message */
|
|
buffer[0] = 1;
|
|
buffer[1] = data->bTag;
|
|
buffer[2] = ~data->bTag;
|
|
buffer[3] = 0; /* Reserved */
|
|
buffer[4] = this_part >> 0;
|
|
buffer[5] = this_part >> 8;
|
|
buffer[6] = this_part >> 16;
|
|
buffer[7] = this_part >> 24;
|
|
/* buffer[8] is set above... */
|
|
buffer[9] = 0; /* Reserved */
|
|
buffer[10] = 0; /* Reserved */
|
|
buffer[11] = 0; /* Reserved */
|
|
|
|
if (copy_from_user(&buffer[USBTMC_HEADER_SIZE], buf + done, this_part)) {
|
|
retval = -EFAULT;
|
|
goto exit;
|
|
}
|
|
|
|
n_bytes = roundup(USBTMC_HEADER_SIZE + this_part, 4);
|
|
memset(buffer + USBTMC_HEADER_SIZE + this_part, 0, n_bytes - (USBTMC_HEADER_SIZE + this_part));
|
|
|
|
do {
|
|
retval = usb_bulk_msg(data->usb_dev,
|
|
usb_sndbulkpipe(data->usb_dev,
|
|
data->bulk_out),
|
|
buffer, n_bytes,
|
|
&actual, USBTMC_TIMEOUT);
|
|
if (retval != 0)
|
|
break;
|
|
n_bytes -= actual;
|
|
} while (n_bytes);
|
|
|
|
data->bTag_last_write = data->bTag;
|
|
data->bTag++;
|
|
|
|
if (!data->bTag)
|
|
data->bTag++;
|
|
|
|
if (retval < 0) {
|
|
dev_err(&data->intf->dev,
|
|
"Unable to send data, error %d\n", retval);
|
|
if (data->auto_abort)
|
|
usbtmc_ioctl_abort_bulk_out(data);
|
|
goto exit;
|
|
}
|
|
|
|
remaining -= this_part;
|
|
done += this_part;
|
|
}
|
|
|
|
retval = count;
|
|
exit:
|
|
mutex_unlock(&data->io_mutex);
|
|
kfree(buffer);
|
|
return retval;
|
|
}
|
|
|
|
static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
|
|
{
|
|
struct usb_host_interface *current_setting;
|
|
struct usb_endpoint_descriptor *desc;
|
|
struct device *dev;
|
|
u8 *buffer;
|
|
int rv;
|
|
int n;
|
|
int actual = 0;
|
|
int max_size;
|
|
|
|
dev = &data->intf->dev;
|
|
|
|
dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
|
|
|
|
buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_rcvctrlpipe(data->usb_dev, 0),
|
|
USBTMC_REQUEST_INITIATE_CLEAR,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
0, 0, buffer, 1, USBTMC_TIMEOUT);
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
|
|
|
|
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
|
|
dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
max_size = 0;
|
|
current_setting = data->intf->cur_altsetting;
|
|
for (n = 0; n < current_setting->desc.bNumEndpoints; n++) {
|
|
desc = ¤t_setting->endpoint[n].desc;
|
|
if (desc->bEndpointAddress == data->bulk_in)
|
|
max_size = usb_endpoint_maxp(desc);
|
|
}
|
|
|
|
if (max_size == 0) {
|
|
dev_err(dev, "Couldn't get wMaxPacketSize\n");
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "wMaxPacketSize is %d\n", max_size);
|
|
|
|
n = 0;
|
|
|
|
usbtmc_clear_check_status:
|
|
|
|
dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n");
|
|
|
|
rv = usb_control_msg(data->usb_dev,
|
|
usb_rcvctrlpipe(data->usb_dev, 0),
|
|
USBTMC_REQUEST_CHECK_CLEAR_STATUS,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
0, 0, buffer, 2, USBTMC_TIMEOUT);
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
|
|
dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
|
|
|
|
if (buffer[0] == USBTMC_STATUS_SUCCESS)
|
|
goto usbtmc_clear_bulk_out_halt;
|
|
|
|
if (buffer[0] != USBTMC_STATUS_PENDING) {
|
|
dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
if (buffer[1] == 1)
|
|
do {
|
|
dev_dbg(dev, "Reading from bulk in EP\n");
|
|
|
|
rv = usb_bulk_msg(data->usb_dev,
|
|
usb_rcvbulkpipe(data->usb_dev,
|
|
data->bulk_in),
|
|
buffer, USBTMC_SIZE_IOBUFFER,
|
|
&actual, USBTMC_TIMEOUT);
|
|
n++;
|
|
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n",
|
|
rv);
|
|
goto exit;
|
|
}
|
|
} while ((actual == max_size) &&
|
|
(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
|
|
|
|
if (actual == max_size) {
|
|
dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
|
|
USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
|
|
rv = -EPERM;
|
|
goto exit;
|
|
}
|
|
|
|
goto usbtmc_clear_check_status;
|
|
|
|
usbtmc_clear_bulk_out_halt:
|
|
|
|
rv = usb_clear_halt(data->usb_dev,
|
|
usb_sndbulkpipe(data->usb_dev, data->bulk_out));
|
|
if (rv < 0) {
|
|
dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
goto exit;
|
|
}
|
|
rv = 0;
|
|
|
|
exit:
|
|
kfree(buffer);
|
|
return rv;
|
|
}
|
|
|
|
static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data)
|
|
{
|
|
int rv;
|
|
|
|
rv = usb_clear_halt(data->usb_dev,
|
|
usb_sndbulkpipe(data->usb_dev, data->bulk_out));
|
|
|
|
if (rv < 0) {
|
|
dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
|
|
rv);
|
|
return rv;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data)
|
|
{
|
|
int rv;
|
|
|
|
rv = usb_clear_halt(data->usb_dev,
|
|
usb_rcvbulkpipe(data->usb_dev, data->bulk_in));
|
|
|
|
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;
|
|
}
|
|
|
|
static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct usbtmc_device_data *data;
|
|
int retval = -EBADRQC;
|
|
|
|
data = file->private_data;
|
|
mutex_lock(&data->io_mutex);
|
|
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 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(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;
|
|
}
|
|
|
|
skip_io_on_zombie:
|
|
mutex_unlock(&data->io_mutex);
|
|
return retval;
|
|
}
|
|
|
|
static int usbtmc_fasync(int fd, struct file *file, int on)
|
|
{
|
|
struct usbtmc_device_data *data = file->private_data;
|
|
|
|
return fasync_helper(fd, file, on, &data->fasync);
|
|
}
|
|
|
|
static __poll_t usbtmc_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct usbtmc_device_data *data = file->private_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(&data->srq_asserted)) ? EPOLLIN | EPOLLRDNORM : 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,
|
|
.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) {
|
|
if (data->fasync)
|
|
kill_fasync(&data->fasync,
|
|
SIGIO, POLL_IN);
|
|
|
|
atomic_set(&data->srq_asserted, 1);
|
|
wake_up_interruptible(&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:
|
|
/* 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);
|
|
atomic_set(&data->srq_asserted, 0);
|
|
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;
|
|
|
|
dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
|
|
|
|
data = usb_get_intfdata(intf);
|
|
usb_deregister_dev(intf, &usbtmc_class);
|
|
sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
|
|
sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
|
|
mutex_lock(&data->io_mutex);
|
|
data->zombie = 1;
|
|
wake_up_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");
|