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@@ -0,0 +1,1087 @@
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+/**
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+ * drivers/usb/class/usbtmc.c - USB Test & Measurment 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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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; either version 2
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+ * of the License, or (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * The GNU General Public License is available at
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+ * http://www.gnu.org/copyleft/gpl.html.
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+ */
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+
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+#include <linux/init.h>
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+#include <linux/module.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/mutex.h>
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+#include <linux/usb.h>
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+#include <linux/usb/tmc.h>
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+
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+
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+#define USBTMC_MINOR_BASE 176
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+
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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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+
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+/* Default USB timeout (in milliseconds) */
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+#define USBTMC_TIMEOUT 10
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+
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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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+
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+static struct usb_device_id usbtmc_devices[] = {
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+ { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), },
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+ { 0, } /* terminating entry */
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+};
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+
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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 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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+
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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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+
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+ unsigned int bulk_in;
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+ unsigned int bulk_out;
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+
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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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+
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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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+
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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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+};
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+#define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
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+
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+/* Forward declarations */
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+static struct usb_driver usbtmc_driver;
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+
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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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+
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+ usb_put_dev(data->usb_dev);
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+ kfree(data);
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+}
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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 = -ENODEV;
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+
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+ intf = usb_find_interface(&usbtmc_driver, iminor(inode));
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+ if (!intf) {
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+ printk(KERN_ERR KBUILD_MODNAME
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+ ": can not find device for minor %d", iminor(inode));
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+ goto exit;
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+ }
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+
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+ data = usb_get_intfdata(intf);
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+ kref_get(&data->kref);
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+
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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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+
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+exit:
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+ return retval;
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+}
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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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+
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+ kref_put(&data->kref, usbtmc_delete);
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+ return 0;
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+}
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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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+ char *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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+
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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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+
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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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+
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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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+
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+ dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
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+
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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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+
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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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+
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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 = le16_to_cpu(current_setting->endpoint[n].
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+ desc.wMaxPacketSize);
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+
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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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+
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+ dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size);
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+
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+ n = 0;
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+
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+ do {
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+ dev_dbg(dev, "Reading from bulk in EP\n");
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+
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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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+
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+ n++;
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+
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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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+
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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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+
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+ n = 0;
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+
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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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+
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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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+
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+ dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
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+
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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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+
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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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+
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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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+
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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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+
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+ n++;
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+
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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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+
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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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+
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+ goto usbtmc_abort_bulk_in_status;
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+
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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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+}
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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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+
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+ dev = &data->intf->dev;
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+
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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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+
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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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+
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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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+
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+ dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]);
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+
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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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+
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+ n = 0;
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+
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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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+
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+ dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]);
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+
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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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+
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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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+
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+ rv = -EPERM;
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+ goto exit;
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+
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+usbtmc_abort_bulk_out_clear_halt:
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+ rv = usb_control_msg(data->usb_dev,
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+ usb_sndctrlpipe(data->usb_dev, 0),
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+ USB_REQ_CLEAR_FEATURE,
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+ USB_DIR_OUT | USB_TYPE_STANDARD |
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+ USB_RECIP_ENDPOINT,
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+ USB_ENDPOINT_HALT, data->bulk_out, buffer,
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+ 0, USBTMC_TIMEOUT);
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+
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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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+
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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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+
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+static ssize_t usbtmc_read(struct file *filp, char __user *buf,
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+ size_t count, loff_t *f_pos)
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+{
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+ struct usbtmc_device_data *data;
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+ struct device *dev;
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+ unsigned long int n_characters;
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+ u8 *buffer;
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+ int actual;
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+ int done;
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+ int remaining;
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+ int retval;
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+ int this_part;
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+
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+ /* Get pointer to private data structure */
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+ data = filp->private_data;
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+ dev = &data->intf->dev;
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+
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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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+
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+ mutex_lock(&data->io_mutex);
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+
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+ remaining = count;
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+ done = 0;
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+
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+ while (remaining > 0) {
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+ if (remaining > USBTMC_SIZE_IOBUFFER - 12 - 3)
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+ this_part = USBTMC_SIZE_IOBUFFER - 12 - 3;
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+ else
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+ this_part = remaining;
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+
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+ /* Setup IO buffer for DEV_DEP_MSG_IN message
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+ * Refer to class specs for details
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+ */
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+ buffer[0] = 2;
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+ buffer[1] = data->bTag;
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+ buffer[2] = ~(data->bTag);
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+ buffer[3] = 0; /* Reserved */
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+ buffer[4] = (this_part - 12 - 3) & 255;
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+ buffer[5] = ((this_part - 12 - 3) >> 8) & 255;
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+ buffer[6] = ((this_part - 12 - 3) >> 16) & 255;
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+ buffer[7] = ((this_part - 12 - 3) >> 24) & 255;
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+ buffer[8] = data->TermCharEnabled * 2;
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+ /* Use term character? */
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+ buffer[9] = data->TermChar;
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|
+ buffer[10] = 0; /* Reserved */
|
|
|
+ buffer[11] = 0; /* Reserved */
|
|
|
+
|
|
|
+ /* Send bulk URB */
|
|
|
+ retval = usb_bulk_msg(data->usb_dev,
|
|
|
+ usb_sndbulkpipe(data->usb_dev,
|
|
|
+ data->bulk_out),
|
|
|
+ buffer, 12, &actual, USBTMC_TIMEOUT);
|
|
|
+
|
|
|
+ /* Store bTag (in case we need to abort) */
|
|
|
+ data->bTag_last_write = data->bTag;
|
|
|
+
|
|
|
+ /* Increment bTag -- and increment again if zero */
|
|
|
+ data->bTag++;
|
|
|
+ if (!data->bTag)
|
|
|
+ (data->bTag)++;
|
|
|
+
|
|
|
+ if (retval < 0) {
|
|
|
+ dev_err(dev, "usb_bulk_msg returned %d\n", retval);
|
|
|
+ if (data->auto_abort)
|
|
|
+ usbtmc_ioctl_abort_bulk_out(data);
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Send bulk URB */
|
|
|
+ retval = usb_bulk_msg(data->usb_dev,
|
|
|
+ usb_rcvbulkpipe(data->usb_dev,
|
|
|
+ data->bulk_in),
|
|
|
+ buffer, USBTMC_SIZE_IOBUFFER, &actual,
|
|
|
+ USBTMC_TIMEOUT);
|
|
|
+
|
|
|
+ /* Store bTag (in case we need to abort) */
|
|
|
+ data->bTag_last_read = data->bTag;
|
|
|
+
|
|
|
+ if (retval < 0) {
|
|
|
+ dev_err(dev, "Unable to read data, error %d\n", retval);
|
|
|
+ if (data->auto_abort)
|
|
|
+ usbtmc_ioctl_abort_bulk_in(data);
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* How many characters did the instrument send? */
|
|
|
+ n_characters = buffer[4] +
|
|
|
+ (buffer[5] << 8) +
|
|
|
+ (buffer[6] << 16) +
|
|
|
+ (buffer[7] << 24);
|
|
|
+
|
|
|
+ /* Copy buffer to user space */
|
|
|
+ if (copy_to_user(buf + done, &buffer[12], n_characters)) {
|
|
|
+ /* There must have been an addressing problem */
|
|
|
+ retval = -EFAULT;
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ done += n_characters;
|
|
|
+ if (n_characters < USBTMC_SIZE_IOBUFFER)
|
|
|
+ remaining = 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Update file position value */
|
|
|
+ *f_pos = *f_pos + done;
|
|
|
+ retval = done;
|
|
|
+
|
|
|
+exit:
|
|
|
+ mutex_unlock(&data->io_mutex);
|
|
|
+ kfree(buffer);
|
|
|
+ return retval;
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t usbtmc_write(struct file *filp, const char __user *buf,
|
|
|
+ size_t count, loff_t *f_pos)
|
|
|
+{
|
|
|
+ struct usbtmc_device_data *data;
|
|
|
+ u8 *buffer;
|
|
|
+ int retval;
|
|
|
+ int actual;
|
|
|
+ unsigned long int n_bytes;
|
|
|
+ int n;
|
|
|
+ int remaining;
|
|
|
+ int done;
|
|
|
+ int this_part;
|
|
|
+
|
|
|
+ data = filp->private_data;
|
|
|
+
|
|
|
+ buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
|
|
|
+ if (!buffer)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ mutex_lock(&data->io_mutex);
|
|
|
+
|
|
|
+ remaining = count;
|
|
|
+ done = 0;
|
|
|
+
|
|
|
+ while (remaining > 0) {
|
|
|
+ if (remaining > USBTMC_SIZE_IOBUFFER - 12) {
|
|
|
+ this_part = USBTMC_SIZE_IOBUFFER - 12;
|
|
|
+ buffer[8] = 0;
|
|
|
+ } else {
|
|
|
+ this_part = remaining;
|
|
|
+ buffer[8] = 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Setup IO buffer for DEV_DEP_MSG_OUT message */
|
|
|
+ buffer[0] = 1;
|
|
|
+ buffer[1] = data->bTag;
|
|
|
+ buffer[2] = ~(data->bTag);
|
|
|
+ buffer[3] = 0; /* Reserved */
|
|
|
+ buffer[4] = this_part & 255;
|
|
|
+ buffer[5] = (this_part >> 8) & 255;
|
|
|
+ buffer[6] = (this_part >> 16) & 255;
|
|
|
+ buffer[7] = (this_part >> 24) & 255;
|
|
|
+ /* buffer[8] is set above... */
|
|
|
+ buffer[9] = 0; /* Reserved */
|
|
|
+ buffer[10] = 0; /* Reserved */
|
|
|
+ buffer[11] = 0; /* Reserved */
|
|
|
+
|
|
|
+ if (copy_from_user(&buffer[12], buf + done, this_part)) {
|
|
|
+ retval = -EFAULT;
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ n_bytes = 12 + this_part;
|
|
|
+ if (this_part % 4)
|
|
|
+ n_bytes += 4 - this_part % 4;
|
|
|
+ for (n = 12 + this_part; n < n_bytes; n++)
|
|
|
+ buffer[n] = 0;
|
|
|
+
|
|
|
+ retval = usb_bulk_msg(data->usb_dev,
|
|
|
+ usb_sndbulkpipe(data->usb_dev,
|
|
|
+ data->bulk_out),
|
|
|
+ buffer, n_bytes, &actual, USBTMC_TIMEOUT);
|
|
|
+
|
|
|
+ data->bTag_last_write = data->bTag;
|
|
|
+ data->bTag++;
|
|
|
+
|
|
|
+ if (!data->bTag)
|
|
|
+ data->bTag++;
|
|
|
+
|
|
|
+ if (retval < 0) {
|
|
|
+ dev_err(&data->intf->dev,
|
|
|
+ "Unable to send data, error %d\n", retval);
|
|
|
+ if (data->auto_abort)
|
|
|
+ usbtmc_ioctl_abort_bulk_out(data);
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ remaining -= this_part;
|
|
|
+ done += this_part;
|
|
|
+ }
|
|
|
+
|
|
|
+ retval = count;
|
|
|
+exit:
|
|
|
+ mutex_unlock(&data->io_mutex);
|
|
|
+ kfree(buffer);
|
|
|
+ return retval;
|
|
|
+}
|
|
|
+
|
|
|
+static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
|
|
|
+{
|
|
|
+ struct usb_host_interface *current_setting;
|
|
|
+ struct usb_endpoint_descriptor *desc;
|
|
|
+ struct device *dev;
|
|
|
+ u8 *buffer;
|
|
|
+ int rv;
|
|
|
+ int n;
|
|
|
+ int actual;
|
|
|
+ int max_size;
|
|
|
+
|
|
|
+ dev = &data->intf->dev;
|
|
|
+
|
|
|
+ dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
|
|
|
+
|
|
|
+ buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
|
|
|
+ if (!buffer)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ rv = usb_control_msg(data->usb_dev,
|
|
|
+ usb_rcvctrlpipe(data->usb_dev, 0),
|
|
|
+ USBTMC_REQUEST_INITIATE_CLEAR,
|
|
|
+ USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
|
+ 0, 0, buffer, 1, USBTMC_TIMEOUT);
|
|
|
+ if (rv < 0) {
|
|
|
+ dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
|
|
|
+
|
|
|
+ if (buffer[0] != USBTMC_STATUS_SUCCESS) {
|
|
|
+ dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
|
|
|
+ rv = -EPERM;
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ max_size = 0;
|
|
|
+ current_setting = data->intf->cur_altsetting;
|
|
|
+ for (n = 0; n < current_setting->desc.bNumEndpoints; n++) {
|
|
|
+ desc = ¤t_setting->endpoint[n].desc;
|
|
|
+ if (desc->bEndpointAddress == data->bulk_in)
|
|
|
+ max_size = le16_to_cpu(desc->wMaxPacketSize);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (max_size == 0) {
|
|
|
+ dev_err(dev, "Couldn't get wMaxPacketSize\n");
|
|
|
+ rv = -EPERM;
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ dev_dbg(dev, "wMaxPacketSize is %d\n", max_size);
|
|
|
+
|
|
|
+ n = 0;
|
|
|
+
|
|
|
+usbtmc_clear_check_status:
|
|
|
+
|
|
|
+ dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n");
|
|
|
+
|
|
|
+ rv = usb_control_msg(data->usb_dev,
|
|
|
+ usb_rcvctrlpipe(data->usb_dev, 0),
|
|
|
+ USBTMC_REQUEST_CHECK_CLEAR_STATUS,
|
|
|
+ USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
|
+ 0, 0, buffer, 2, USBTMC_TIMEOUT);
|
|
|
+ if (rv < 0) {
|
|
|
+ dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
|
|
|
+
|
|
|
+ if (buffer[0] == USBTMC_STATUS_SUCCESS)
|
|
|
+ goto usbtmc_clear_bulk_out_halt;
|
|
|
+
|
|
|
+ if (buffer[0] != USBTMC_STATUS_PENDING) {
|
|
|
+ dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
|
|
|
+ rv = -EPERM;
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (buffer[1] == 1)
|
|
|
+ do {
|
|
|
+ dev_dbg(dev, "Reading from bulk in EP\n");
|
|
|
+
|
|
|
+ rv = usb_bulk_msg(data->usb_dev,
|
|
|
+ usb_rcvbulkpipe(data->usb_dev,
|
|
|
+ data->bulk_in),
|
|
|
+ buffer, USBTMC_SIZE_IOBUFFER,
|
|
|
+ &actual, USBTMC_TIMEOUT);
|
|
|
+ n++;
|
|
|
+
|
|
|
+ if (rv < 0) {
|
|
|
+ dev_err(dev, "usb_control_msg returned %d\n",
|
|
|
+ rv);
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+ } while ((actual == max_size) &&
|
|
|
+ (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
|
|
|
+
|
|
|
+ if (actual == max_size) {
|
|
|
+ dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
|
|
|
+ USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
|
|
|
+ rv = -EPERM;
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ goto usbtmc_clear_check_status;
|
|
|
+
|
|
|
+usbtmc_clear_bulk_out_halt:
|
|
|
+
|
|
|
+ rv = usb_control_msg(data->usb_dev,
|
|
|
+ usb_sndctrlpipe(data->usb_dev, 0),
|
|
|
+ USB_REQ_CLEAR_FEATURE,
|
|
|
+ USB_DIR_OUT | USB_TYPE_STANDARD |
|
|
|
+ USB_RECIP_ENDPOINT,
|
|
|
+ USB_ENDPOINT_HALT,
|
|
|
+ data->bulk_out, buffer, 0,
|
|
|
+ USBTMC_TIMEOUT);
|
|
|
+ if (rv < 0) {
|
|
|
+ dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+ rv = 0;
|
|
|
+
|
|
|
+exit:
|
|
|
+ kfree(buffer);
|
|
|
+ return rv;
|
|
|
+}
|
|
|
+
|
|
|
+static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data)
|
|
|
+{
|
|
|
+ u8 *buffer;
|
|
|
+ int rv;
|
|
|
+
|
|
|
+ buffer = kmalloc(2, GFP_KERNEL);
|
|
|
+ if (!buffer)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ rv = usb_control_msg(data->usb_dev,
|
|
|
+ usb_sndctrlpipe(data->usb_dev, 0),
|
|
|
+ USB_REQ_CLEAR_FEATURE,
|
|
|
+ USB_DIR_OUT | USB_TYPE_STANDARD |
|
|
|
+ USB_RECIP_ENDPOINT,
|
|
|
+ USB_ENDPOINT_HALT, data->bulk_out,
|
|
|
+ buffer, 0, USBTMC_TIMEOUT);
|
|
|
+
|
|
|
+ if (rv < 0) {
|
|
|
+ dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
|
|
|
+ rv);
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+ rv = 0;
|
|
|
+
|
|
|
+exit:
|
|
|
+ kfree(buffer);
|
|
|
+ return rv;
|
|
|
+}
|
|
|
+
|
|
|
+static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data)
|
|
|
+{
|
|
|
+ u8 *buffer;
|
|
|
+ int rv;
|
|
|
+
|
|
|
+ buffer = kmalloc(2, GFP_KERNEL);
|
|
|
+ if (!buffer)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ rv = usb_control_msg(data->usb_dev, usb_sndctrlpipe(data->usb_dev, 0),
|
|
|
+ USB_REQ_CLEAR_FEATURE,
|
|
|
+ USB_DIR_OUT | USB_TYPE_STANDARD |
|
|
|
+ USB_RECIP_ENDPOINT,
|
|
|
+ USB_ENDPOINT_HALT, data->bulk_in, buffer, 0,
|
|
|
+ USBTMC_TIMEOUT);
|
|
|
+
|
|
|
+ if (rv < 0) {
|
|
|
+ dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
|
|
|
+ rv);
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+ rv = 0;
|
|
|
+
|
|
|
+exit:
|
|
|
+ kfree(buffer);
|
|
|
+ return rv;
|
|
|
+}
|
|
|
+
|
|
|
+static int get_capabilities(struct usbtmc_device_data *data)
|
|
|
+{
|
|
|
+ struct device *dev = &data->usb_dev->dev;
|
|
|
+ char *buffer;
|
|
|
+ int rv;
|
|
|
+
|
|
|
+ buffer = kmalloc(0x18, GFP_KERNEL);
|
|
|
+ if (!buffer)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0),
|
|
|
+ USBTMC_REQUEST_GET_CAPABILITIES,
|
|
|
+ USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
|
+ 0, 0, buffer, 0x18, USBTMC_TIMEOUT);
|
|
|
+ if (rv < 0) {
|
|
|
+ dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
|
+ return rv;
|
|
|
+ }
|
|
|
+
|
|
|
+ dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
|
|
|
+ dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]);
|
|
|
+ dev_dbg(dev, "Device capabilities are %x\n", buffer[5]);
|
|
|
+ dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]);
|
|
|
+ dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]);
|
|
|
+ if (buffer[0] != USBTMC_STATUS_SUCCESS) {
|
|
|
+ dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
|
|
|
+ return -EPERM;
|
|
|
+ }
|
|
|
+
|
|
|
+ data->capabilities.interface_capabilities = buffer[4];
|
|
|
+ data->capabilities.device_capabilities = buffer[5];
|
|
|
+ data->capabilities.usb488_interface_capabilities = buffer[14];
|
|
|
+ data->capabilities.usb488_device_capabilities = buffer[15];
|
|
|
+
|
|
|
+ kfree(buffer);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+#define capability_attribute(name) \
|
|
|
+static ssize_t show_##name(struct device *dev, \
|
|
|
+ struct device_attribute *attr, char *buf) \
|
|
|
+{ \
|
|
|
+ struct usb_interface *intf = to_usb_interface(dev); \
|
|
|
+ struct usbtmc_device_data *data = usb_get_intfdata(intf); \
|
|
|
+ \
|
|
|
+ return sprintf(buf, "%d\n", data->capabilities.name); \
|
|
|
+} \
|
|
|
+static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
|
|
|
+
|
|
|
+capability_attribute(interface_capabilities);
|
|
|
+capability_attribute(device_capabilities);
|
|
|
+capability_attribute(usb488_interface_capabilities);
|
|
|
+capability_attribute(usb488_device_capabilities);
|
|
|
+
|
|
|
+static struct attribute *capability_attrs[] = {
|
|
|
+ &dev_attr_interface_capabilities.attr,
|
|
|
+ &dev_attr_device_capabilities.attr,
|
|
|
+ &dev_attr_usb488_interface_capabilities.attr,
|
|
|
+ &dev_attr_usb488_device_capabilities.attr,
|
|
|
+ NULL,
|
|
|
+};
|
|
|
+
|
|
|
+static struct attribute_group capability_attr_grp = {
|
|
|
+ .attrs = capability_attrs,
|
|
|
+};
|
|
|
+
|
|
|
+static ssize_t show_TermChar(struct device *dev,
|
|
|
+ struct device_attribute *attr, char *buf)
|
|
|
+{
|
|
|
+ struct usb_interface *intf = to_usb_interface(dev);
|
|
|
+ struct usbtmc_device_data *data = usb_get_intfdata(intf);
|
|
|
+
|
|
|
+ return sprintf(buf, "%c\n", data->TermChar);
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t store_TermChar(struct device *dev,
|
|
|
+ struct device_attribute *attr,
|
|
|
+ const char *buf, size_t count)
|
|
|
+{
|
|
|
+ struct usb_interface *intf = to_usb_interface(dev);
|
|
|
+ struct usbtmc_device_data *data = usb_get_intfdata(intf);
|
|
|
+
|
|
|
+ if (count < 1)
|
|
|
+ return -EINVAL;
|
|
|
+ data->TermChar = buf[0];
|
|
|
+ return count;
|
|
|
+}
|
|
|
+static DEVICE_ATTR(TermChar, S_IRUGO, show_TermChar, store_TermChar);
|
|
|
+
|
|
|
+#define data_attribute(name) \
|
|
|
+static ssize_t show_##name(struct device *dev, \
|
|
|
+ struct device_attribute *attr, char *buf) \
|
|
|
+{ \
|
|
|
+ struct usb_interface *intf = to_usb_interface(dev); \
|
|
|
+ struct usbtmc_device_data *data = usb_get_intfdata(intf); \
|
|
|
+ \
|
|
|
+ return sprintf(buf, "%d\n", data->name); \
|
|
|
+} \
|
|
|
+static ssize_t store_##name(struct device *dev, \
|
|
|
+ struct device_attribute *attr, \
|
|
|
+ const char *buf, size_t count) \
|
|
|
+{ \
|
|
|
+ struct usb_interface *intf = to_usb_interface(dev); \
|
|
|
+ struct usbtmc_device_data *data = usb_get_intfdata(intf); \
|
|
|
+ ssize_t result; \
|
|
|
+ unsigned val; \
|
|
|
+ \
|
|
|
+ result = sscanf(buf, "%u\n", &val); \
|
|
|
+ if (result != 1) \
|
|
|
+ result = -EINVAL; \
|
|
|
+ data->name = val; \
|
|
|
+ if (result < 0) \
|
|
|
+ return result; \
|
|
|
+ else \
|
|
|
+ return count; \
|
|
|
+} \
|
|
|
+static DEVICE_ATTR(name, S_IRUGO, show_##name, store_##name)
|
|
|
+
|
|
|
+data_attribute(TermCharEnabled);
|
|
|
+data_attribute(auto_abort);
|
|
|
+
|
|
|
+static struct attribute *data_attrs[] = {
|
|
|
+ &dev_attr_TermChar.attr,
|
|
|
+ &dev_attr_TermCharEnabled.attr,
|
|
|
+ &dev_attr_auto_abort.attr,
|
|
|
+ NULL,
|
|
|
+};
|
|
|
+
|
|
|
+static struct attribute_group data_attr_grp = {
|
|
|
+ .attrs = data_attrs,
|
|
|
+};
|
|
|
+
|
|
|
+static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data)
|
|
|
+{
|
|
|
+ struct device *dev;
|
|
|
+ u8 *buffer;
|
|
|
+ int rv;
|
|
|
+
|
|
|
+ dev = &data->intf->dev;
|
|
|
+
|
|
|
+ buffer = kmalloc(2, GFP_KERNEL);
|
|
|
+ if (!buffer)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ rv = usb_control_msg(data->usb_dev,
|
|
|
+ usb_rcvctrlpipe(data->usb_dev, 0),
|
|
|
+ USBTMC_REQUEST_INDICATOR_PULSE,
|
|
|
+ USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
|
+ 0, 0, buffer, 0x01, USBTMC_TIMEOUT);
|
|
|
+
|
|
|
+ if (rv < 0) {
|
|
|
+ dev_err(dev, "usb_control_msg returned %d\n", rv);
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+
|
|
|
+ dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
|
|
|
+
|
|
|
+ if (buffer[0] != USBTMC_STATUS_SUCCESS) {
|
|
|
+ dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
|
|
|
+ rv = -EPERM;
|
|
|
+ goto exit;
|
|
|
+ }
|
|
|
+ rv = 0;
|
|
|
+
|
|
|
+exit:
|
|
|
+ kfree(buffer);
|
|
|
+ return rv;
|
|
|
+}
|
|
|
+
|
|
|
+static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
|
+{
|
|
|
+ struct usbtmc_device_data *data;
|
|
|
+ int retval = -EBADRQC;
|
|
|
+
|
|
|
+ data = file->private_data;
|
|
|
+ mutex_lock(&data->io_mutex);
|
|
|
+
|
|
|
+ switch (cmd) {
|
|
|
+ case USBTMC_IOCTL_CLEAR_OUT_HALT:
|
|
|
+ retval = usbtmc_ioctl_clear_out_halt(data);
|
|
|
+
|
|
|
+ case USBTMC_IOCTL_CLEAR_IN_HALT:
|
|
|
+ retval = usbtmc_ioctl_clear_in_halt(data);
|
|
|
+
|
|
|
+ case USBTMC_IOCTL_INDICATOR_PULSE:
|
|
|
+ retval = usbtmc_ioctl_indicator_pulse(data);
|
|
|
+
|
|
|
+ case USBTMC_IOCTL_CLEAR:
|
|
|
+ retval = usbtmc_ioctl_clear(data);
|
|
|
+
|
|
|
+ case USBTMC_IOCTL_ABORT_BULK_OUT:
|
|
|
+ retval = usbtmc_ioctl_abort_bulk_out(data);
|
|
|
+
|
|
|
+ case USBTMC_IOCTL_ABORT_BULK_IN:
|
|
|
+ retval = usbtmc_ioctl_abort_bulk_in(data);
|
|
|
+ }
|
|
|
+
|
|
|
+ mutex_unlock(&data->io_mutex);
|
|
|
+ return retval;
|
|
|
+}
|
|
|
+
|
|
|
+static struct file_operations fops = {
|
|
|
+ .owner = THIS_MODULE,
|
|
|
+ .read = usbtmc_read,
|
|
|
+ .write = usbtmc_write,
|
|
|
+ .open = usbtmc_open,
|
|
|
+ .release = usbtmc_release,
|
|
|
+ .unlocked_ioctl = usbtmc_ioctl,
|
|
|
+};
|
|
|
+
|
|
|
+static struct usb_class_driver usbtmc_class = {
|
|
|
+ .name = "usbtmc%d",
|
|
|
+ .fops = &fops,
|
|
|
+ .minor_base = USBTMC_MINOR_BASE,
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+static int usbtmc_probe(struct usb_interface *intf,
|
|
|
+ const struct usb_device_id *id)
|
|
|
+{
|
|
|
+ struct usbtmc_device_data *data;
|
|
|
+ struct usb_host_interface *iface_desc;
|
|
|
+ struct usb_endpoint_descriptor *endpoint;
|
|
|
+ int n;
|
|
|
+ int retcode;
|
|
|
+
|
|
|
+ dev_dbg(&intf->dev, "%s called\n", __func__);
|
|
|
+
|
|
|
+ data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL);
|
|
|
+ if (!data) {
|
|
|
+ dev_err(&intf->dev, "Unable to allocate kernel memory\n");
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
+
|
|
|
+ data->intf = intf;
|
|
|
+ data->id = id;
|
|
|
+ data->usb_dev = usb_get_dev(interface_to_usbdev(intf));
|
|
|
+ usb_set_intfdata(intf, data);
|
|
|
+ kref_init(&data->kref);
|
|
|
+ mutex_init(&data->io_mutex);
|
|
|
+
|
|
|
+ /* Initialize USBTMC bTag and other fields */
|
|
|
+ data->bTag = 1;
|
|
|
+ data->TermCharEnabled = 0;
|
|
|
+ data->TermChar = '\n';
|
|
|
+
|
|
|
+ /* USBTMC devices have only one setting, so use that */
|
|
|
+ iface_desc = data->intf->cur_altsetting;
|
|
|
+
|
|
|
+ /* Find bulk in endpoint */
|
|
|
+ for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
|
|
|
+ endpoint = &iface_desc->endpoint[n].desc;
|
|
|
+
|
|
|
+ if (usb_endpoint_is_bulk_in(endpoint)) {
|
|
|
+ data->bulk_in = endpoint->bEndpointAddress;
|
|
|
+ dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n",
|
|
|
+ data->bulk_in);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Find bulk out endpoint */
|
|
|
+ for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
|
|
|
+ endpoint = &iface_desc->endpoint[n].desc;
|
|
|
+
|
|
|
+ if (usb_endpoint_is_bulk_out(endpoint)) {
|
|
|
+ data->bulk_out = endpoint->bEndpointAddress;
|
|
|
+ dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n",
|
|
|
+ data->bulk_out);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ retcode = get_capabilities(data);
|
|
|
+ if (retcode)
|
|
|
+ dev_err(&intf->dev, "can't read capabilities\n");
|
|
|
+ else
|
|
|
+ retcode = sysfs_create_group(&intf->dev.kobj,
|
|
|
+ &capability_attr_grp);
|
|
|
+
|
|
|
+ retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp);
|
|
|
+
|
|
|
+ retcode = usb_register_dev(intf, &usbtmc_class);
|
|
|
+ if (retcode) {
|
|
|
+ dev_err(&intf->dev, "Not able to get a minor"
|
|
|
+ " (base %u, slice default): %d\n", USBTMC_MINOR_BASE,
|
|
|
+ retcode);
|
|
|
+ goto error_register;
|
|
|
+ }
|
|
|
+ dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+error_register:
|
|
|
+ sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
|
|
|
+ sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
|
|
|
+ kref_put(&data->kref, usbtmc_delete);
|
|
|
+ return retcode;
|
|
|
+}
|
|
|
+
|
|
|
+static void usbtmc_disconnect(struct usb_interface *intf)
|
|
|
+{
|
|
|
+ struct usbtmc_device_data *data;
|
|
|
+
|
|
|
+ dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
|
|
|
+
|
|
|
+ data = usb_get_intfdata(intf);
|
|
|
+ usb_deregister_dev(intf, &usbtmc_class);
|
|
|
+ sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
|
|
|
+ sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
|
|
|
+ kref_put(&data->kref, usbtmc_delete);
|
|
|
+}
|
|
|
+
|
|
|
+static struct usb_driver usbtmc_driver = {
|
|
|
+ .name = "usbtmc",
|
|
|
+ .id_table = usbtmc_devices,
|
|
|
+ .probe = usbtmc_probe,
|
|
|
+ .disconnect = usbtmc_disconnect
|
|
|
+};
|
|
|
+
|
|
|
+static int __init usbtmc_init(void)
|
|
|
+{
|
|
|
+ int retcode;
|
|
|
+
|
|
|
+ retcode = usb_register(&usbtmc_driver);
|
|
|
+ if (retcode)
|
|
|
+ printk(KERN_ERR KBUILD_MODNAME": Unable to register driver\n");
|
|
|
+ return retcode;
|
|
|
+}
|
|
|
+module_init(usbtmc_init);
|
|
|
+
|
|
|
+static void __exit usbtmc_exit(void)
|
|
|
+{
|
|
|
+ usb_deregister(&usbtmc_driver);
|
|
|
+}
|
|
|
+module_exit(usbtmc_exit);
|
|
|
+
|
|
|
+MODULE_LICENSE("GPL");
|
Greg Kroah-Hartman