Resubmitting this driver for inclusion as a usb/misc driver
for 2.6.0-test7 (hopefully with correct minor number handling and no
ioctls).
The Lego usb IR tower is used with Lego Mindstorms kits and this is used
by a number of Universities (including mine) and schools for teaching
computer science, robotics, software engineering, etc.
It was not written as a serial driver for various technical difficulties
and the requirement to change various development environments (LeJOS
and NQC)if I had overcome these.
It has the unofficial support of Lego.
diff -Nru a/arch/i386/defconfig b/arch/i386/defconfig
-- a/arch/i386/defconfig 2003-08-23 07:57:48.000000000 +0800
+++ b/arch/i386/defconfig 2003-09-03 13:13:14.688314360 +0800
@@ -1080,6 +1080,7 @@
# CONFIG_USB_TIGL is not set
# CONFIG_USB_AUERSWALD is not set
# CONFIG_USB_RIO500 is not set
+# CONFIG_USB_LEGOTOWER is not set
# CONFIG_USB_BRLVGER is not set
# CONFIG_USB_LCD is not set
# CONFIG_USB_TEST is not set
diff -Nru a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
-- a/drivers/usb/misc/Kconfig 2003-08-23 08:01:28.000000000 +0800
+++ b/drivers/usb/misc/Kconfig 2003-09-03 13:17:04.980304656 +0800
@@ -58,6 +58,18 @@
The module will be called rio500. If you want to compile it as
a module, say M here and read <file:Documentation/modules.txt>.
+config USB_LEGOTOWER
+ tristate "USB Lego Infrared Tower support (EXPERIMENTAL)"
+ depends on USB && EXPERIMENTAL
+ help
+ Say Y here if you want to connect a USB Lego Infrared Tower to your
+ computer's USB port.
+
+ This code is also available as a module ( = code which can be
+ inserted in and removed from the running kernel whenever you want).
+ The module will be called legousbtower. If you want to compile it as
+ a module, say M here and read <file:Documentation/modules.txt>.
+
config USB_BRLVGER
tristate "Tieman Voyager USB Braille display support (EXPERIMENTAL)"
depends on USB && EXPERIMENTAL
diff -Nru a/drivers/usb/Makefile b/drivers/usb/Makefile
-- a/drivers/usb/Makefile 2003-08-23 08:00:45.000000000 +0800
+++ b/drivers/usb/Makefile 2003-09-03 13:19:48.176495064 +0800
@@ -58,4 +58,6 @@
obj-$(CONFIG_USB_TEST) += misc/
obj-$(CONFIG_USB_TIGL) += misc/
obj-$(CONFIG_USB_USS720) += misc/
+obj-$(CONFIG_USB_LEGOTOWER) += misc/
+
diff -Nru a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile
-- a/drivers/usb/misc/Makefile 2003-08-23 07:56:31.000000000 +0800
+++ b/drivers/usb/misc/Makefile 2003-09-03 13:18:45.676996432 +0800
@@ -12,3 +12,4 @@
obj-$(CONFIG_USB_TEST) += usbtest.o
obj-$(CONFIG_USB_TIGL) += tiglusb.o
obj-$(CONFIG_USB_USS720) += uss720.o
+obj-$(CONFIG_USB_LEGOTOWER) += legousbtower.o
diff -Nru a/drivers/usb/misc/legousbtower.c
b/drivers/usb/misc/legousbtower.c
-- a/drivers/usb/misc/legousbtower.c 1970-01-01 08:00:00.000000000 +0800
+++ b/drivers/usb/misc/legousbtower.c 2003-09-03 13:21:17.157967824
+0800
@@ -0,0 +1,912 @@
+/*
+ * LEGO USB Tower driver
+ *
+ * Copyright (c) 2003 David Glance <[EMAIL PROTECTED]>
+ * 2001 Juergen Stuber <[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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * derived from USB Skeleton driver - 0.5
+ * Copyright (c) 2001 Greg Kroah-Hartman ([EMAIL PROTECTED])
+ *
+ * History:
+ *
+ * 2001-10-13 - 0.1 js
+ * - first version
+ * 2001-11-03 - 0.2 js
+ * - simplified buffering, one-shot URBs for writing
+ * 2001-11-10 - 0.3 js
+ * - removed IOCTL (setting power/mode is more complicated,
postponed)
+ * 2001-11-28 - 0.4 js
+ * - added vendor commands for mode of operation and power level in
open
+ * 2001-12-04 - 0.5 js
+ * - set IR mode by default (by oversight 0.4 set VLL mode)
+ * 2002-01-11 - 0.5? pcchan
+ * - make read buffer reusable and work around bytes_to_write issue
between
+ * uhci and legusbtower
+ * 2002-09-23 - 0.52 david ([EMAIL PROTECTED])
+ * - imported into lejos project
+ * - changed wake_up to wake_up_interruptible
+ * - changed to use lego0 rather than tower0
+ * - changed dbg() to use __func__ rather than deprecated
__FUNCTION__
+ * 2003-01-12 - 0.53 david ([EMAIL PROTECTED])
+ * - changed read and write to write everything or timeout (from a
patch by Chris Riesen and
+ * Brett Thaeler driver)
+ * - added ioctl functionality to set timeouts
+ * 2003-07-18 - 0.54 davidgsf ([EMAIL PROTECTED])
+ * - initial import into LegoUSB project
+ * - merge of existing LegoUSB.c driver
+ * 2003-07-18 - 0.56 davidgsf ([EMAIL PROTECTED])
+ * - port to 2.6 style driver
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/smp_lock.h>
+#include <linux/completion.h>
+#include <asm/uaccess.h>
+#include <linux/usb.h>
+
+
+#ifdef CONFIG_USB_DEBUG
+ static int debug = 4;
+#else
+ static int debug = 1;
+#endif
+
+/* Use our own dbg macro */
+#undef dbg
+#define dbg(lvl, format, arg...) do { if (debug >= lvl)
printk(KERN_DEBUG __FILE__ " : " format " \n", ## arg); } while (0)
+
+
+/* Version Information */
+#define DRIVER_VERSION "v0.56"
+#define DRIVER_AUTHOR "David Glance, [EMAIL PROTECTED]"
+#define DRIVER_DESC "LEGO USB Tower Driver"
+
+/* Module paramaters */
+MODULE_PARM(debug, "i");
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
+
+/* Define these values to match your device */
+#define LEGO_USB_TOWER_VENDOR_ID 0x0694
+#define LEGO_USB_TOWER_PRODUCT_ID 0x0001
+
+/* table of devices that work with this driver */
+static struct usb_device_id tower_table [] = {
+ { USB_DEVICE(LEGO_USB_TOWER_VENDOR_ID, LEGO_USB_TOWER_PRODUCT_ID) },
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE (usb, tower_table);
+
+/* FIXME: Get a minor range for your devices from the usb maintainer */
+#define LEGO_USB_TOWER_MINOR_BASE 0xB3
+
+/* we can have up to this number of device plugged in at once */
+#define MAX_DEVICES 16
+
+#define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command
*/
+
+/* Structure to hold all of our device specific stuff */
+struct lego_usb_tower {
+ struct semaphore sem; /* locks this structure */
+ struct usb_device* udev; /* save off the usb device pointer */
+ struct usb_interface* interface;
+ unsigned char minor; /* the starting minor number for this device */
+
+ int open_count; /* number of times this port has been opened */
+
+ char* read_buffer;
+ int read_buffer_length;
+
+ wait_queue_head_t read_wait;
+ wait_queue_head_t write_wait;
+
+ char* interrupt_in_buffer;
+ struct usb_endpoint_descriptor* interrupt_in_endpoint;
+ struct urb* interrupt_in_urb;
+
+ char* interrupt_out_buffer;
+ struct usb_endpoint_descriptor* interrupt_out_endpoint;
+ struct urb* interrupt_out_urb;
+
+};
+
+/* Note that no locking is needed:
+ * read_buffer is arbitrated by read_buffer_length == 0
+ * interrupt_out_buffer is arbitrated by interrupt_out_urb->status ==
-EINPROGRESS
+ * interrupt_in_buffer belongs to urb alone and is overwritten on
overflow
+ */
+
+/* the global usb devfs handle */
+// extern devfs_handle_t usb_devfs_handle;
+
+
+/* local function prototypes */
+static ssize_t tower_read (struct file *file, char *buffer, size_t
count, loff_t *ppos);
+static ssize_t tower_write (struct file *file, const char *buffer,
size_t count, loff_t *ppos);
+static int tower_ioctl (struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg);
+static inline void tower_delete (struct lego_usb_tower *dev);
+static int tower_open (struct inode *inode, struct file *file);
+static int tower_release (struct inode *inode, struct file *file);
+static int tower_release_internal (struct lego_usb_tower *dev);
+static void tower_abort_transfers (struct lego_usb_tower *dev);
+static void tower_interrupt_in_callback (struct urb *urb, struct
pt_regs *regs);
+static void tower_interrupt_out_callback (struct urb *urb, struct
pt_regs *regs);
+
+static int tower_probe (struct usb_interface *interface, const struct
usb_device_id *id);
+static void tower_disconnect (struct usb_interface *interface);
+
+
+/* prevent races between open() and disconnect */
+static DECLARE_MUTEX (disconnect_sem);
+
+/* file operations needed when we register this driver */
+static struct file_operations tower_fops = {
+ .owner = THIS_MODULE,
+ .read = tower_read,
+ .write = tower_write,
+ .ioctl = tower_ioctl,
+ .open = tower_open,
+ .release = tower_release,
+};
+
+/*
+ * usb class driver info in order to get a minor number from the usb
core,
+ * and to have the device registered with devfs and the driver core
+ */
+static struct usb_class_driver tower_class = {
+ .name = "usb/legousbtower%d",
+ .fops = &tower_fops,
+ .mode = S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH,
+ .minor_base = LEGO_USB_TOWER_MINOR_BASE,
+};
+
+
+/* usb specific object needed to register this driver with the usb
subsystem */
+static struct usb_driver tower_driver = {
+ .owner = THIS_MODULE,
+ .name = "legousbtower",
+ .probe = tower_probe,
+ .disconnect = tower_disconnect,
+ .id_table = tower_table,
+};
+
+
+/**
+ * lego_usb_tower_debug_data
+ */
+static inline void lego_usb_tower_debug_data (int level, const char
*function, int size, const unsigned char *data)
+{
+ int i;
+
+ if (debug < level)
+ return;
+
+ printk (KERN_DEBUG __FILE__": %s - length = %d, data = ", function,
size);
+ for (i = 0; i < size; ++i) {
+ printk ("%.2x ", data[i]);
+ }
+ printk ("\n");
+}
+
+
+/**
+ * tower_delete
+ */
+static inline void tower_delete (struct lego_usb_tower *dev)
+{
+ dbg(2, "%s enter", __func__);
+
+ tower_abort_transfers (dev);
+
+ /* free data structures */
+ if (dev->interrupt_in_urb != NULL) {
+ usb_free_urb (dev->interrupt_in_urb);
+ }
+ if (dev->interrupt_out_urb != NULL) {
+ usb_free_urb (dev->interrupt_out_urb);
+ }
+ if (dev->read_buffer != NULL) {
+ kfree (dev->read_buffer);
+ }
+ if (dev->interrupt_in_buffer != NULL) {
+ kfree (dev->interrupt_in_buffer);
+ }
+ if (dev->interrupt_out_buffer != NULL) {
+ kfree (dev->interrupt_out_buffer);
+ }
+ kfree (dev);
+
+ dbg(2, "%s : leave", __func__);
+}
+
+
+/**
+ * tower_open
+ */
+static int tower_open (struct inode *inode, struct file *file)
+{
+ struct lego_usb_tower *dev = NULL;
+ int subminor;
+ int retval = 0;
+ struct usb_interface *interface;
+
+ dbg(2,"%s : enter", __func__);
+
+ subminor = iminor(inode);
+
+ down (&disconnect_sem);
+
+ interface = usb_find_interface (&tower_driver, subminor);
+
+ if (!interface) {
+ err ("%s - error, can't find device for minor %d",
+ __FUNCTION__, subminor);
+ retval = -ENODEV;
+ goto exit_no_device;
+ }
+
+ dev = usb_get_intfdata(interface);
+
+ if (!dev) {
+ retval = -ENODEV;
+ goto exit_no_device;
+ }
+
+ /* lock this device */
+ down (&dev->sem);
+
+
+ /* increment our usage count for the device */
+ ++dev->open_count;
+
+ /* save device in the file's private structure */
+ file->private_data = dev;
+
+
+ /* initialize in direction */
+ dev->read_buffer_length = 0;
+
+ up (&dev->sem);
+
+ exit_no_device:
+
+ up (&disconnect_sem);
+
+ dbg(2,"%s : leave, return value %d ", __func__, retval);
+
+ return retval;
+}
+
+/**
+ * tower_release
+ */
+static int tower_release (struct inode *inode, struct file *file)
+{
+ struct lego_usb_tower *dev;
+ int retval = 0;
+
+ dbg(2," %s : enter", __func__);
+
+ dev = (struct lego_usb_tower *)file->private_data;
+
+ if (dev == NULL) {
+ dbg(1," %s : object is NULL", __func__);
+ retval = -ENODEV;
+ goto exit;
+ }
+
+
+ /* lock our device */
+ down (&dev->sem);
+
+ if (dev->open_count <= 0) {
+ dbg(1," %s : device not opened", __func__);
+ retval = -ENODEV;
+ goto exit;
+ }
+
+ /* do the work */
+ retval = tower_release_internal (dev);
+
+ exit:
+ up (&dev->sem);
+ dbg(2," %s : leave, return value %d", __func__, retval);
+ return retval;
+}
+
+
+/**
+ * tower_release_internal
+ */
+static int tower_release_internal (struct lego_usb_tower *dev)
+{
+ int retval = 0;
+
+ dbg(2," %s : enter", __func__);
+
+ if (dev->udev == NULL) {
+ /* the device was unplugged before the file was released */
+ tower_delete (dev);
+ goto exit;
+ }
+
+ /* decrement our usage count for the device */
+ --dev->open_count;
+ if (dev->open_count <= 0) {
+ tower_abort_transfers (dev);
+ dev->open_count = 0;
+ }
+
+ exit:
+ dbg(2," %s : leave", __func__);
+ return retval;
+}
+
+
+/**
+ * tower_abort_transfers
+ * aborts transfers and frees associated data structures
+ */
+static void tower_abort_transfers (struct lego_usb_tower *dev)
+{
+ dbg(2," %s : enter", __func__);
+
+ if (dev == NULL) {
+ dbg(1," %s : dev is null", __func__);
+ goto exit;
+ }
+
+ /* shutdown transfer */
+ if (dev->interrupt_in_urb != NULL) {
+ usb_unlink_urb (dev->interrupt_in_urb);
+ }
+ if (dev->interrupt_out_urb != NULL) {
+ usb_unlink_urb (dev->interrupt_out_urb);
+ }
+
+ exit:
+ dbg(2," %s : leave", __func__);
+}
+
+
+/**
+ * tower_read
+ */
+static ssize_t tower_read (struct file *file, char *buffer, size_t
count, loff_t *ppos)
+{
+ struct lego_usb_tower *dev;
+ size_t bytes_read = 0;
+ size_t bytes_to_read;
+ int i;
+ int retval = 0;
+ int timeout = 0;
+
+ dbg(2," %s : enter, count = %d", __func__, count);
+
+ dev = (struct lego_usb_tower *)file->private_data;
+
+ /* lock this object */
+ down (&dev->sem);
+
+ /* verify that the device wasn't unplugged */
+ if (dev->udev == NULL) {
+ retval = -ENODEV;
+ err("No device or device unplugged %d", retval);
+ goto exit;
+ }
+
+ /* verify that we actually have some data to read */
+ if (count == 0) {
+ dbg(1," %s : read request of 0 bytes", __func__);
+ goto exit;
+ }
+
+
+ timeout = COMMAND_TIMEOUT;
+
+ while (1) {
+ if (dev->read_buffer_length == 0) {
+
+ /* start reading */
+ usb_fill_int_urb (dev->interrupt_in_urb,dev->udev,
+ usb_rcvintpipe(dev->udev,
dev->interrupt_in_endpoint->bEndpointAddress),
+ dev->interrupt_in_buffer,
+ dev->interrupt_in_endpoint->wMaxPacketSize,
+ tower_interrupt_in_callback,
+ dev,
+ dev->interrupt_in_endpoint->bInterval);
+
+ retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL);
+
+ if (retval < 0) {
+ err("Couldn't submit interrupt_in_urb");
+ goto exit;
+ }
+
+ if (timeout <= 0) {
+ retval = -ETIMEDOUT;
+ goto exit;
+ }
+
+ if (signal_pending(current)) {
+
+ retval = -EINTR;
+ goto exit;
+ }
+
+ up (&dev->sem);
+ timeout = interruptible_sleep_on_timeout (&dev->read_wait, timeout);
+ down (&dev->sem);
+
+ } else {
+ /* copy the data from read_buffer into
userspace */
+ bytes_to_read = count > dev->read_buffer_length
? dev->read_buffer_length : count;
+ if (copy_to_user (buffer, dev->read_buffer,
bytes_to_read) != 0) {
+ retval = -EFAULT;
+ goto exit;
+ }
+ dev->read_buffer_length -= bytes_to_read;
+ for (i=0; i<dev->read_buffer_length; i++) {
+ dev->read_buffer[i] =
dev->read_buffer[i+bytes_to_read];
+ }
+
+ buffer += bytes_to_read;
+ count -= bytes_to_read;
+ bytes_read += bytes_to_read;
+ if (count == 0) {
+ break;
+ }
+ }
+
+
+ }
+
+ retval = bytes_read;
+
+ exit:
+ /* unlock the device */
+ up (&dev->sem);
+
+ dbg(2," %s : leave, return value %d", __func__, retval);
+ return retval;
+}
+
+
+/**
+ * tower_write
+ */
+static ssize_t tower_write (struct file *file, const char *buffer,
size_t count, loff_t *ppos)
+{
+ struct lego_usb_tower *dev;
+ size_t bytes_written = 0;
+ size_t bytes_to_write;
+ size_t buffer_size;
+ int retval = 0;
+ int timeout = 0;
+
+ dbg(2," %s : enter, count = %d", __func__, count);
+
+ dev = (struct lego_usb_tower *)file->private_data;
+
+ /* lock this object */
+ down (&dev->sem);
+
+ /* verify that the device wasn't unplugged */
+ if (dev->udev == NULL) {
+ retval = -ENODEV;
+ err("No device or device unplugged %d", retval);
+ goto exit;
+ }
+
+ /* verify that we actually have some data to write */
+ if (count == 0) {
+ dbg(1," %s : write request of 0 bytes", __func__);
+ goto exit;
+ }
+
+
+ while (count > 0) {
+ if (dev->interrupt_out_urb->status == -EINPROGRESS) {
+ timeout = COMMAND_TIMEOUT;
+
+ while (timeout > 0) {
+ if (signal_pending(current)) {
+ dbg(1," %s : interrupted", __func__);
+ retval = -EINTR;
+ goto exit;
+ }
+ up (&dev->sem);
+ timeout = interruptible_sleep_on_timeout (&dev->write_wait, timeout);
+ down (&dev->sem);
+ if (timeout > 0) {
+ break;
+ }
+ dbg(1," %s : interrupted timeout: %d", __func__, timeout);
+ }
+
+
+ dbg(1," %s : final timeout: %d", __func__, timeout);
+
+ if (timeout == 0) {
+ dbg(1, "%s - command timed out.", __func__);
+ retval = -ETIMEDOUT;
+ goto exit;
+ }
+
+ dbg(4," %s : in progress, count = %d", __func__,
count);
+
+ } else {
+ dbg(4," %s : sending, count = %d", __func__, count);
+
+ /* write the data into interrupt_out_buffer
from userspace */
+ buffer_size =
dev->interrupt_out_endpoint->wMaxPacketSize;
+ bytes_to_write = count > buffer_size ?
buffer_size : count;
+ dbg(4," %s : buffer_size = %d, count = %d, bytes_to_write = %d",
__func__, buffer_size, count, bytes_to_write);
+
+ if (copy_from_user (dev->interrupt_out_buffer,
buffer, bytes_to_write) != 0) {
+ retval = -EFAULT;
+ goto exit;
+ }
+
+ /* send off the urb */
+ usb_fill_int_urb(
+ dev->interrupt_out_urb,
+ dev->udev,
+ usb_sndintpipe(dev->udev,
dev->interrupt_out_endpoint->bEndpointAddress),
+ dev->interrupt_out_buffer,
+ bytes_to_write,
+ tower_interrupt_out_callback,
+ dev,
+ dev->interrupt_in_endpoint->bInterval);
+
+ dev->interrupt_out_urb->actual_length =
bytes_to_write;
+ retval = usb_submit_urb
(dev->interrupt_out_urb, GFP_KERNEL);
+
+ if (retval < 0) {
+ err("Couldn't submit interrupt_out_urb
%d", retval);
+ goto exit;
+ }
+
+ buffer += bytes_to_write;
+ count -= bytes_to_write;
+
+ bytes_written += bytes_to_write;
+ }
+ }
+
+ retval = bytes_written;
+
+ exit:
+ /* unlock the device */
+ up (&dev->sem);
+
+ dbg(2," %s : leave, return value %d", __func__, retval);
+
+ return retval;
+}
+
+
+/**
+ * Number of reasons why this isn't supported - GKH doesn't like them
+ * since they are non-portable and also most of this is derived
from
+ * proprietary information
+ */
+
+static int tower_ioctl (struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
+{
+ int retval = -ENOTTY; /* default: we don't understand ioctl
*/
+
+ return retval;
+}
+
+
+/**
+ * tower_interrupt_in_callback
+ */
+static void tower_interrupt_in_callback (struct urb *urb, struct
pt_regs *regs)
+{
+ struct lego_usb_tower *dev = (struct lego_usb_tower *)urb->context;
+
+ dbg(4," %s : enter, status %d", __func__, urb->status);
+
+ lego_usb_tower_debug_data(5,__func__, urb->actual_length,
urb->transfer_buffer);
+
+ if (urb->status != 0) {
+ if ((urb->status != -ENOENT) && (urb->status !=
-ECONNRESET)) {
+ dbg(1," %s : nonzero status received: %d", __func__,
urb->status);
+ }
+ goto exit;
+ }
+
+ down (&dev->sem);
+
+ if (urb->actual_length > 0) {
+ if (dev->read_buffer_length < (4 *
dev->interrupt_in_endpoint->wMaxPacketSize) - (urb->actual_length)) {
+
+ memcpy
(dev->read_buffer+dev->read_buffer_length, dev->interrupt_in_buffer,
urb->actual_length);
+
+ dev->read_buffer_length += urb->actual_length;
+ dbg(1," %s reading %d ", __func__, urb->actual_length);
+ wake_up_interruptible (&dev->read_wait);
+
+ } else {
+ dbg(1," %s : read_buffer overflow", __func__);
+ }
+ }
+
+ up (&dev->sem);
+
+ exit:
+ lego_usb_tower_debug_data(5,__func__, urb->actual_length,
urb->transfer_buffer);
+ dbg(4," %s : leave, status %d", __func__, urb->status);
+}
+
+
+/**
+ * tower_interrupt_out_callback
+ */
+static void tower_interrupt_out_callback (struct urb *urb, struct
pt_regs *regs)
+{
+ struct lego_usb_tower *dev = (struct lego_usb_tower *)urb->context;
+
+ dbg(4," %s : enter, status %d", __func__, urb->status);
+ lego_usb_tower_debug_data(5,__func__, urb->actual_length,
urb->transfer_buffer);
+
+ if (urb->status != 0) {
+ if ((urb->status != -ENOENT) &&
+ (urb->status != -ECONNRESET)) {
+ dbg(1, " %s :nonzero status received: %d",
__func__, urb->status);
+ }
+ goto exit;
+ }
+
+ wake_up_interruptible(&dev->write_wait);
+ exit:
+
+ lego_usb_tower_debug_data(5,__func__, urb->actual_length,
urb->transfer_buffer);
+ dbg(4," %s : leave, status %d", __func__, urb->status);
+}
+
+
+/**
+ * tower_probe
+ *
+ * Called by the usb core when a new device is connected that it thinks
+ * this driver might be interested in.
+ */
+static int tower_probe (struct usb_interface *interface, const struct
usb_device_id *id)
+{
+ struct usb_device *udev = interface_to_usbdev(interface);
+ struct lego_usb_tower *dev = NULL;
+ struct usb_host_interface *iface_desc;
+ struct usb_endpoint_descriptor* endpoint;
+ int i;
+ int retval = -ENOMEM;
+
+ dbg(2," %s : enter", __func__);
+
+ if (udev == NULL) {
+ info ("udev is NULL.");
+ }
+
+ /* See if the device offered us matches what we can accept */
+ if ((udev->descriptor.idVendor != LEGO_USB_TOWER_VENDOR_ID) ||
+ (udev->descriptor.idProduct != LEGO_USB_TOWER_PRODUCT_ID)) {
+ return -ENODEV;
+ }
+
+
+ /* allocate memory for our device state and intialize it */
+
+ dev = kmalloc (sizeof(struct lego_usb_tower), GFP_KERNEL);
+
+ if (dev == NULL) {
+ err ("Out of memory");
+ goto exit;
+ }
+
+ init_MUTEX (&dev->sem);
+
+ dev->udev = udev;
+ dev->open_count = 0;
+
+ dev->read_buffer = NULL;
+ dev->read_buffer_length = 0;
+
+ init_waitqueue_head (&dev->read_wait);
+ init_waitqueue_head (&dev->write_wait);
+
+ dev->interrupt_in_buffer = NULL;
+ dev->interrupt_in_endpoint = NULL;
+ dev->interrupt_in_urb = NULL;
+
+ dev->interrupt_out_buffer = NULL;
+ dev->interrupt_out_endpoint = NULL;
+ dev->interrupt_out_urb = NULL;
+
+
+ iface_desc = &interface->altsetting[0];
+
+ /* set up the endpoint information */
+ for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+ endpoint = &iface_desc->endpoint[i].desc;
+
+ if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
USB_DIR_IN) &&
+ ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
USB_ENDPOINT_XFER_INT)) {
+ dev->interrupt_in_endpoint = endpoint;
+ }
+
+ if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
USB_DIR_OUT) &&
+ ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
USB_ENDPOINT_XFER_INT)) {
+ dev->interrupt_out_endpoint = endpoint;
+ }
+ }
+ if(dev->interrupt_in_endpoint == NULL) {
+ err("interrupt in endpoint not found");
+ goto exit;
+ }
+ if (dev->interrupt_out_endpoint == NULL) {
+ err("interrupt out endpoint not found");
+ goto exit;
+ }
+
+ dev->read_buffer = kmalloc
((4*dev->interrupt_in_endpoint->wMaxPacketSize), GFP_KERNEL);
+ if (!dev->read_buffer) {
+ err("Couldn't allocate read_buffer");
+ goto exit;
+ }
+ dev->interrupt_in_buffer = kmalloc
(dev->interrupt_in_endpoint->wMaxPacketSize, GFP_KERNEL);
+ if (!dev->interrupt_in_buffer) {
+ err("Couldn't allocate interrupt_in_buffer");
+ goto exit;
+ }
+ dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!dev->interrupt_in_urb) {
+ err("Couldn't allocate interrupt_in_urb");
+ goto exit;
+ }
+ dev->interrupt_out_buffer = kmalloc
(dev->interrupt_out_endpoint->wMaxPacketSize, GFP_KERNEL);
+ if (!dev->interrupt_out_buffer) {
+ err("Couldn't allocate interrupt_out_buffer");
+ goto exit;
+ }
+ dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!dev->interrupt_out_urb) {
+ err("Couldn't allocate interrupt_out_urb");
+ goto exit;
+ }
+
+ /* initialize the devfs node for this device and register it */
+
+ /* we can register the device now, as it is ready */
+ usb_set_intfdata (interface, dev);
+
+ retval = usb_register_dev (interface, &tower_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;
+ }
+
+ dev->minor = interface->minor;
+
+ /* let the user know what node this device is now attached to */
+ info ("LEGO USB Tower device now attached to /dev/usb/lego%d",
(dev->minor - LEGO_USB_TOWER_MINOR_BASE));
+
+
+
+ exit:
+ dbg(2," %s : leave, return value 0x%.8lx (dev)", __func__, (long)
dev);
+
+ return retval;
+
+ error:
+ tower_delete(dev);
+ return retval;
+}
+
+
+/**
+ * tower_disconnect
+ *
+ * Called by the usb core when the device is removed from the system.
+ */
+static void tower_disconnect (struct usb_interface *interface)
+{
+ struct lego_usb_tower *dev;
+ int minor;
+
+ dbg(2," %s : enter", __func__);
+
+ down (&disconnect_sem);
+
+ dev = usb_get_intfdata (interface);
+ usb_set_intfdata (interface, NULL);
+
+
+ down (&dev->sem);
+
+ minor = dev->minor;
+
+ /* give back our minor */
+ usb_deregister_dev (interface, &tower_class);
+
+ /* if the device is not opened, then we clean up right now */
+ if (!dev->open_count) {
+ up (&dev->sem);
+ tower_delete (dev);
+ } else {
+ dev->udev = NULL;
+ up (&dev->sem);
+ }
+
+ up (&disconnect_sem);
+
+ info("LEGO USB Tower #%d now disconnected", (minor -
LEGO_USB_TOWER_MINOR_BASE));
+
+ dbg(2," %s : leave", __func__);
+}
+
+
+
+/**
+ * lego_usb_tower_init
+ */
+static int __init lego_usb_tower_init(void)
+{
+ int result;
+ int retval = 0;
+
+ dbg(2," %s : enter", __func__);
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&tower_driver);
+ if (result < 0) {
+ err("usb_register failed for the "__FILE__" driver. Error number %d",
result);
+ retval = -1;
+ goto exit;
+ }
+
+ info(DRIVER_DESC " " DRIVER_VERSION);
+
+ exit:
+ dbg(2," %s : leave, return value %d", __func__, retval);
+
+ return retval;
+}
+
+
+/**
+ * lego_usb_tower_exit
+ */
+static void __exit lego_usb_tower_exit(void)
+{
+ dbg(2," %s : enter", __func__);
+
+ /* deregister this driver with the USB subsystem */
+ usb_deregister (&tower_driver);
+
+ dbg(2," %s : leave", __func__);
+}
+
+module_init (lego_usb_tower_init);
+module_exit (lego_usb_tower_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+#ifdef MODULE_LICENSE
+MODULE_LICENSE("GPL");
+#endif
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