From: David Lopez <[email protected]>
This driver adds support for LabJack U3 and UE9 USB DAQ devices.
Signed-off-by: David Lopez <[email protected]>
---
Patch against stable 2.6.19 kernel.
Kconfig | 15 +
Makefile | 1
ljusb.c | 584 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
diff -uprN -X linux-2.6.19-vanilla/Documentation/dontdiff
linux-2.6.19-vanilla/drivers/usb/misc/Kconfig
linux-2.6.19/drivers/usb/misc/Kconfig
--- linux-2.6.19-vanilla/drivers/usb/misc/Kconfig 2006-11-29
14:57:37.000000000 -0700
+++ linux-2.6.19/drivers/usb/misc/Kconfig 2006-11-30 16:13:05.000000000 -0700
@@ -233,6 +233,21 @@ config USB_TRANCEVIBRATOR
To compile this driver as a module, choose M here: the
module will be called trancevibrator.
+config USB_LJ
+ tristate "USB LabJack DAQ devices driver"
+ depends on USB
+ help
+ USB driver for the following LabJack DAQ devices:
+ - U3
+ - UE9
+
+ For a user-space API and usage examples, please visit the LabJack
+ downloads web page at <http://www.labjack.com/downloads.php> and go
+ to the specific device's downloads page.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ljusb.
+
config USB_TEST
tristate "USB testing driver (DEVELOPMENT)"
depends on USB && USB_DEVICEFS && EXPERIMENTAL
diff -uprN -X linux-2.6.19-vanilla/Documentation/dontdiff
linux-2.6.19-vanilla/drivers/usb/misc/ljusb.c
linux-2.6.19/drivers/usb/misc/ljusb.c
--- linux-2.6.19-vanilla/drivers/usb/misc/ljusb.c 1969-12-31
17:00:00.000000000 -0700
+++ linux-2.6.19/drivers/usb/misc/ljusb.c 2006-12-01 13:14:33.000000000 -0700
@@ -0,0 +1,584 @@
+/*
+ * USB LabJack Data Acquisition Devices driver
+ *
+ * Copyright (C) 2006 LabJack Corporation
+ *
+ * Author: David Lopez <[email protected]>
+ *
+ * Derived from the USB Skeleton driver 2.0.
+ * Copyright (C) 2001-2004 Greg Kroah-Hartman ([email protected])
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2.
+ *
+ * The following devices are currently supported:
+ * - U3
+ * - UE9
+ *
+ * For a user-space API and usage examples, please visit the
+ * LabJack downloads web page at
+ * <http://www.labjack.com/downloads.php> and go to the specific
+ * device's downloads page.
+ *
+ * History:
+ * 2006-12-01 - 0.10 dl
+ * - Initial version with U3 and UE9 device support
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/kref.h>
+#include <asm/uaccess.h>
+#include <linux/usb.h>
+
+
+/* Version Information */
+#define DRIVER_VERSION "v0.10"
+#define DRIVER_DESC "USB LabJack DAQ Devices driver"
+
+#define USB_LJ_MINOR_BASE 192
+
+/* Vendor and Product IDs */
+#define USB_VENDOR_ID_LJ 0x0cd5
+#define USB_PRODUCT_ID_LJ_U3 0x0003
+#define USB_PRODUCT_ID_LJ_UE9 0x0009
+
+/* table of devices that work with this driver */
+static struct usb_device_id lj_usb_table [] = {
+ { USB_DEVICE(USB_VENDOR_ID_LJ, USB_PRODUCT_ID_LJ_U3) }, /* U3 */
+ { USB_DEVICE(USB_VENDOR_ID_LJ, USB_PRODUCT_ID_LJ_UE9) }, /* UE9 */
+ { } /* Terminating entry */
+};
+MODULE_DEVICE_TABLE (usb, lj_usb_table);
+
+/* IOCTL defines */
+#define IOCTL_LJ_SET_BULK_IN_TIMEOUT 0x1
+#define IOCTL_LJ_GET_PRODUCT_ID 0x2
+#define IOCTL_LJ_SET_BULK_IN_ENDPOINT 0x3
+
+/* Private defines */
+#define MAX_TRANSFER ( PAGE_SIZE - 512 )
+#define BULK_IN_TIMEOUT 1000 /* default bulk in read timeout */
+#define N_BULK_IN_ENDPOINTS 2 /* number of bulk in endpoints */
+#define N_BULK_OUT_ENDPOINTS 2 /* number of bulk out endpoints */
+#define DEFAULT_BULK_IN_ENDPOINT 0
+
+/* Structure to hold all of our device specific stuff */
+struct usb_ljusb {
+ struct usb_device * udev; /* the usb device for this device */
+ struct usb_interface * interface; /* the interface for this device */
+ struct semaphore sem; /* semaphore for this structure */
+
+ /* the buffers to receive data */
+ unsigned char * bulk_in_buffer[N_BULK_IN_ENDPOINTS];
+
+ /* the sizes of the receive buffers */
+ size_t bulk_in_size[N_BULK_IN_ENDPOINTS];
+
+ /* the addresses of the bulk in endpoints */
+ __u8 bulk_in_endpointAddr[N_BULK_IN_ENDPOINTS];
+ int bulk_in_timeout; /* timeout for bulk in reads, in ms */
+ int next_bulk_in_endpoint; /* specifies the bulk endpoint to use on
+ * the next read */
+ /* the addresses of the bulk out endpoints */
+ __u8 bulk_out_endpointAddr[N_BULK_OUT_ENDPOINTS];
+ struct kref kref;
+};
+#define to_ljusb_dev(d) container_of(d, struct usb_ljusb, kref)
+
+static struct usb_driver ljusb_driver;
+
+/**
+ * ljusb_delete
+ */
+static void ljusb_delete(struct kref *kref)
+{
+ int i;
+ struct usb_ljusb *dev = to_ljusb_dev(kref);
+
+ usb_put_dev(dev->udev);
+
+ for(i = 0; i < N_BULK_IN_ENDPOINTS; ++i)
+ kfree (dev->bulk_in_buffer[i]);
+ kfree (dev);
+}
+
+/**
+ * ljusb_open
+ */
+static int ljusb_open(struct inode *inode, struct file *file)
+{
+ struct usb_ljusb *dev;
+ struct usb_interface *interface;
+ int subminor;
+ int retval = 0;
+
+ subminor = iminor(inode);
+
+ interface = usb_find_interface(&ljusb_driver, subminor);
+ if (!interface) {
+ err ("%s - error, can't find device for minor %d",
+ __FUNCTION__, subminor);
+ retval = -ENODEV;
+ goto exit;
+ }
+
+ dev = usb_get_intfdata(interface);
+ if (!dev) {
+ retval = -ENODEV;
+ goto exit;
+ }
+
+ /* increment our usage count for the device */
+ kref_get(&dev->kref);
+
+ /* save our object in the file's private structure */
+ file->private_data = dev;
+exit:
+ return retval;
+}
+
+/**
+ * ljusb_release
+ */
+static int ljusb_release(struct inode *inode, struct file *file)
+{
+ struct usb_ljusb *dev;
+
+ dev = (struct usb_ljusb *)file->private_data;
+ if (dev == NULL)
+ return -ENODEV;
+
+ /* decrement the count on our device */
+ kref_put(&dev->kref, ljusb_delete);
+ return 0;
+}
+
+/**
+ * ljusb_read
+ */
+static ssize_t ljusb_read(struct file *file, char *buffer, size_t
count, loff_t *ppos)
+{
+ struct usb_ljusb *dev;
+ int retval = 0;
+ int bytes_read;
+ int bytes_read_tot = 0;
+ int ep;
+
+ dev = (struct usb_ljusb *)file->private_data;
+
+ /* lock object */
+ if (down_interruptible(&dev->sem)) {
+ retval = -ERESTARTSYS;
+ goto exit;
+ }
+
+ ep = dev->next_bulk_in_endpoint;
+
+ /* Checking if bulk in endpoint to read from is valid */
+ if(ep > N_BULK_IN_ENDPOINTS || ep < 0) {
+ retval = -EPERM;
+ goto exit;
+ }
+
+ /* bulk read for responses that can be larger than the bulk endpoint size */
+ while(count > 0) {
+ /* do a blocking bulk read to get data from the device */
+ retval = usb_bulk_msg(dev->udev,
+ usb_rcvbulkpipe(dev->udev,
+ dev->bulk_in_endpointAddr[ep]),
+ dev->bulk_in_buffer[ep],
+ min(dev->bulk_in_size[ep], count),
+ &bytes_read, dev->bulk_in_timeout);
+
+ /* if the read was successful, copy the data to userspace */
+ if (!retval || retval == -ETIMEDOUT) {
+ if (copy_to_user(buffer + bytes_read_tot,
+ dev->bulk_in_buffer[ep],
+ min((size_t)bytes_read, count)))
+ retval = -EFAULT;
+ else
+ bytes_read_tot += bytes_read;
+ }
+ else
+ goto exit;
+
+ /* No bytes were read from device, or bytes read were less than bulk
+ * endpoint size, indicating that there is nothing left to read from
+ * device. */
+ if(bytes_read <= 0 || dev->bulk_in_size[ep] > bytes_read)
+ goto set_retval;
+
+ count = count > bytes_read ? count-bytes_read : 0;
+ }
+
+set_retval:
+ retval = bytes_read_tot;
+exit:
+ /* setting the next bulk in endpoint back to the default endpoint */
+ dev->next_bulk_in_endpoint = DEFAULT_BULK_IN_ENDPOINT;
+ up(&dev->sem);
+ return retval;
+}
+
+/**
+ * ljusb_write_bulk_callback
+ */
+static void ljusb_write_bulk_callback(struct urb *urb)
+{
+ struct usb_ljusb *dev;
+
+ dev = (struct usb_ljusb *)urb->context;
+
+ /* sync/async unlink faults aren't errors */
+ if (urb->status &&
+ !(urb->status == -ENOENT ||
+ urb->status == -ECONNRESET ||
+ urb->status == -ESHUTDOWN)) {
+ dbg("%s - nonzero write bulk status received: %d",
+ __FUNCTION__, urb->status);
+ }
+
+ /* free up our allocated buffer */
+ usb_buffer_free(urb->dev, urb->transfer_buffer_length,
+ urb->transfer_buffer, urb->transfer_dma);
+ up(&dev->sem);
+}
+
+/**
+ * ljusb_write
+ */
+static ssize_t ljusb_write(struct file *file, const char
*user_buffer, size_t count, loff_t *ppos)
+{
+ struct usb_ljusb *dev;
+ int retval = 0;
+ struct urb *urb = NULL;
+ char *buf = NULL;
+ size_t writesize = min(count, (size_t)MAX_TRANSFER);
+ int ep;
+
+ dev = (struct usb_ljusb *)file->private_data;
+
+ /* verify that we actually have some data to write */
+ if (count == 0)
+ goto exit;
+
+ /* limits the number of URBs in flight to one */
+ if (down_interruptible(&dev->sem)) {
+ retval = -ERESTARTSYS;
+ goto exit;
+ }
+
+ /* writing through bulk out endpoint 0 by default */
+ ep = 0;
+
+ /* create a urb, and a buffer for it, and copy the data to the urb */
+ urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!urb) {
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ buf = usb_buffer_alloc(dev->udev, writesize, GFP_KERNEL, &urb->transfer_dma);
+ if (!buf) {
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ if (copy_from_user(buf, user_buffer, writesize)) {
+ retval = -EFAULT;
+ goto error;
+ }
+
+ /* initialize the urb properly */
+ usb_fill_bulk_urb(urb, dev->udev,
+ usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr[ep]),
+ buf, writesize, ljusb_write_bulk_callback, dev);
+ urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+ /* send the data out the bulk port */
+ retval = usb_submit_urb(urb, GFP_KERNEL);
+ if (retval) {
+ err("%s - failed submitting write urb, error %d", __FUNCTION__, retval);
+ goto error;
+ }
+
+ /* release our reference to this urb, the USB core will eventually
free it entirely */
+ usb_free_urb(urb);
+exit:
+ return writesize;
+
+error:
+ usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);
+ usb_free_urb(urb);
+ up(&dev->sem);
+ return retval;
+}
+
+/**
+ * ljusb_ioctl
+ */
+static int ljusb_ioctl (struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
+{
+ struct usb_ljusb *dev;
+ void __user *data;
+ int retval = 0;
+ int timeout = 0;
+ int ep = 0;
+
+ dev = (struct usb_ljusb *)file->private_data;
+
+ /* lock this object */
+ if (down_interruptible(&dev->sem)) {
+ retval = -ERESTARTSYS;
+ return retval;
+ }
+
+ /* driver specific commands */
+ switch (cmd) {
+ /* Sets the timeout for usb_bulk_msg reads transfers in ms from an integer
+ * argument. If the timeout is set to zero, reads will wait forever */
+ case IOCTL_LJ_SET_BULK_IN_TIMEOUT:
+ data = (void __user *) arg;
+ if (data == NULL)
+ break;
+
+ if (copy_from_user(&timeout, data, sizeof(int))) {
+ retval = -EFAULT;
+ break;
+ }
+
+ if(timeout < 0)
+ retval = -EINVAL;
+ else
+ dev->bulk_in_timeout = timeout;
+
+ break;
+ /* Gets the Product ID for the device */
+ case IOCTL_LJ_GET_PRODUCT_ID:
+ retval = put_user(dev->udev->descriptor.idProduct,
+ (unsigned int __user *)arg);
+ break;
+ /* Sets the bulk in endpoint for the next read from an integer argument.
+ * There are two bulk endpoints, which are endpoints 0 and 1 when
+ * setting the integer argument. */
+ case IOCTL_LJ_SET_BULK_IN_ENDPOINT:
+ data = (void __user *) arg;
+ if (data == NULL)
+ break;
+
+ if (copy_from_user(&ep, data, sizeof(int))) {
+ retval = -EFAULT;
+ break;
+ }
+
+ if(ep > N_BULK_IN_ENDPOINTS || ep < 0)
+ retval = -EINVAL;
+ else
+ dev->next_bulk_in_endpoint = ep;
+ break;
+ default:
+ retval = -ENOTTY;
+ break;
+ }
+
+ /* unlock the device */
+ up (&dev->sem);
+
+ return retval;
+}
+
+static struct file_operations ljusb_fops = {
+ .owner = THIS_MODULE,
+ .read = ljusb_read,
+ .write = ljusb_write,
+ .open = ljusb_open,
+ .release = ljusb_release,
+ .ioctl = ljusb_ioctl,
+};
+
+/**
+ * usb class driver info in order to get a minor number from the usb core,
+ * and to have the device registered with the driver core
+ */
+static struct usb_class_driver ljusb_class = {
+ .name = "ljusb%d",
+ .fops = &ljusb_fops,
+ .minor_base = USB_LJ_MINOR_BASE,
+};
+
+/**
+ * ljusb_probe
+ */
+static int ljusb_probe(struct usb_interface *interface, const struct
usb_device_id *id)
+{
+ struct usb_ljusb *dev = NULL;
+ struct usb_host_interface *iface_desc;
+ struct usb_endpoint_descriptor *endpoint;
+ size_t buffer_size;
+ int i, j, k;
+ int retval = -ENOMEM;
+
+ /* allocate memory for our device state and initialize it */
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (dev == NULL) {
+ err("Out of memory");
+ goto error;
+ }
+ kref_init(&dev->kref);
+ sema_init(&dev->sem, 1);
+
+ dev->udev = usb_get_dev(interface_to_usbdev(interface));
+ dev->interface = interface;
+
+ /* set default bulk in read timeout */
+ dev->bulk_in_timeout = BULK_IN_TIMEOUT;
+
+ /* set default bulk in endpoint */
+ dev->next_bulk_in_endpoint = DEFAULT_BULK_IN_ENDPOINT;
+
+ /* set up the endpoint information */
+ iface_desc = interface->cur_altsetting;
+ j = 0;
+ k = 0;
+ for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+ endpoint = &iface_desc->endpoint[i].desc;
+
+ if(j < N_BULK_IN_ENDPOINTS)
+ {
+ if (!dev->bulk_in_endpointAddr[j] &&
+ ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
+ == USB_DIR_IN) &&
+ ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+ == USB_ENDPOINT_XFER_BULK)) {
+ /* we found a bulk in endpoint */
+ buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+ dev->bulk_in_size[j] = buffer_size;
+ dev->bulk_in_endpointAddr[j] = endpoint->bEndpointAddress;
+ dev->bulk_in_buffer[j] = kmalloc(buffer_size, GFP_KERNEL);
+ if (!dev->bulk_in_buffer[j]) {
+ err("Could not allocate bulk_in_buffer");
+ goto error;
+ }
+ ++j;
+ }
+ }
+
+ if(k < N_BULK_OUT_ENDPOINTS) {
+ if (!dev->bulk_out_endpointAddr[k] &&
+ ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
+ == USB_DIR_OUT) &&
+ ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+ == USB_ENDPOINT_XFER_BULK)) {
+ /* we found a bulk out endpoint */
+ dev->bulk_out_endpointAddr[k] = endpoint->bEndpointAddress;
+ ++k;
+ }
+ }
+ }
+
+ /* Checking if valid bulk in endpoints were found */
+ for(j = 0; j < N_BULK_IN_ENDPOINTS; ++j) {
+ if (!dev->bulk_in_endpointAddr[j]) {
+ err("Could not find all valid bulk-in endpoints");
+ goto error;
+ }
+ }
+
+ /* Checking if a valid bulk out endpoint was found. There is a
second bulk out
+ * endpoint, but we are not using it */
+ if (!dev->bulk_out_endpointAddr[0]) {
+ err("Could not find all valid bulk-out endpoints");
+ goto error;
+ }
+
+ /* save our data pointer in this interface device */
+ usb_set_intfdata(interface, dev);
+
+ /* we can register the device now, as it is ready */
+ retval = usb_register_dev(interface, &ljusb_class);
+ if (retval) {
+ /* something prevented us from registering this driver */
+ err("Not able to get a minor for this device.");
+ usb_set_intfdata(interface, NULL);
+ goto error;
+ }
+
+ /* let the user know what node this device is now attached to */
+ info("USB Labjack device with product id %d now attached to
ljusb-%d", dev->udev->descriptor.idProduct, interface->minor);
+ return 0;
+
+error:
+ if (dev)
+ kref_put(&dev->kref, ljusb_delete);
+ return retval;
+}
+
+/**
+ * ljusb_disconnect
+ */
+static void ljusb_disconnect(struct usb_interface *interface)
+{
+ struct usb_ljusb *dev;
+ int minor = interface->minor;
+
+ /* prevent ljusb_open() from racing ljusb_disconnect() */
+ lock_kernel();
+
+ dev = usb_get_intfdata(interface);
+ usb_set_intfdata(interface, NULL);
+
+ /* give back our minor */
+ usb_deregister_dev(interface, &ljusb_class);
+
+ unlock_kernel();
+
+ /* decrement our usage count */
+ kref_put(&dev->kref, ljusb_delete);
+
+ info("USB LabJack #%d now disconnected", minor);
+}
+
+static struct usb_driver ljusb_driver = {
+ .name = "ljusb",
+ .probe = ljusb_probe,
+ .disconnect = ljusb_disconnect,
+ .id_table = lj_usb_table,
+};
+
+/**
+ * usb_ljusb_delete
+ */
+static int __init usb_ljusb_init(void)
+{
+ int result;
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&ljusb_driver);
+ if (result)
+ err("usb_register failed. Error number %d", result);
+
+ return result;
+}
+
+/**
+ * usb_ljusb_delete
+ */
+static void __exit usb_ljusb_exit(void)
+{
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&ljusb_driver);
+}
+
+module_init (usb_ljusb_init);
+module_exit (usb_ljusb_exit);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+#ifdef MODULE_LICENSE
+MODULE_LICENSE("GPL");
+#endif
diff -uprN -X linux-2.6.19-vanilla/Documentation/dontdiff
linux-2.6.19-vanilla/drivers/usb/misc/Makefile
linux-2.6.19/drivers/usb/misc/Makefile
--- linux-2.6.19-vanilla/drivers/usb/misc/Makefile 2006-11-29
14:57:37.000000000 -0700
+++ linux-2.6.19/drivers/usb/misc/Makefile 2006-11-30 17:52:11.000000000 -0700
@@ -15,6 +15,7 @@ obj-$(CONFIG_USB_LCD) += usblcd.o
obj-$(CONFIG_USB_LD) += ldusb.o
obj-$(CONFIG_USB_LED) += usbled.o
obj-$(CONFIG_USB_LEGOTOWER) += legousbtower.o
+obj-$(CONFIG_USB_LJ) += ljusb.o
obj-$(CONFIG_USB_PHIDGET) += phidget.o
obj-$(CONFIG_USB_PHIDGETKIT) += phidgetkit.o
obj-$(CONFIG_USB_PHIDGETMOTORCONTROL) += phidgetmotorcontrol.o
-
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