--- /dev/null
+/*
+ * adutux - driver for ADU devices from Ontrak Control Systems
+ * This is an experimental driver. Use at your own risk.
+ * This driver is not supported by Ontrak Control Systems.
+ *
+ * Copyright (c) 2003 John Homppi (SCO, leave this notice here)
+ *
+ * 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 the Lego USB Tower driver 0.56:
+ * Copyright (c) 2003 David Glance <davidgsf@sourceforge.net>
+ * 2001 Juergen Stuber <stuber@loria.fr>
+ * that was derived from USB Skeleton driver - 0.5
+ * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <asm/uaccess.h>
+
+#ifdef CONFIG_USB_DEBUG
+static int debug = 5;
+#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 "v0.0.13"
+#define DRIVER_AUTHOR "John Homppi"
+#define DRIVER_DESC "adutux (see www.ontrak.net)"
+
+/* Module parameters */
+module_param(debug, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
+/* Define these values to match your device */
+#define ADU_VENDOR_ID 0x0a07
+#define ADU_PRODUCT_ID 0x0064
+
+/* table of devices that work with this driver */
+static struct usb_device_id device_table [] = {
+ { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */
+ { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */
+ { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */
+ { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */
+ { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */
+ { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */
+ { }/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, device_table);
+
+#ifdef CONFIG_USB_DYNAMIC_MINORS
+#define ADU_MINOR_BASE 0
+#else
+#define ADU_MINOR_BASE 67
+#endif
+
+/* 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 adu_device {
+ 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 */
+ char serial_number[8];
+
+ int open_count; /* number of times this port has been opened */
+
+ char* read_buffer_primary;
+ int read_buffer_length;
+ char* read_buffer_secondary;
+ int secondary_head;
+ int secondary_tail;
+ spinlock_t buflock;
+
+ 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;
+ int read_urb_finished;
+
+ char* interrupt_out_buffer;
+ struct usb_endpoint_descriptor* interrupt_out_endpoint;
+ struct urb* interrupt_out_urb;
+};
+
+/* prevent races between open() and disconnect */
+static DEFINE_MUTEX(disconnect_mutex);
+static struct usb_driver adu_driver;
+
+static void adu_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");
+}
+
+/**
+ * adu_abort_transfers
+ * aborts transfers and frees associated data structures
+ */
+static void adu_abort_transfers(struct adu_device *dev)
+{
+ dbg(2," %s : enter", __FUNCTION__);
+
+ if (dev == NULL) {
+ dbg(1," %s : dev is null", __FUNCTION__);
+ goto exit;
+ }
+
+ if (dev->udev == NULL) {
+ dbg(1," %s : udev is null", __FUNCTION__);
+ goto exit;
+ }
+
+ dbg(2," %s : udev state %d", __FUNCTION__, dev->udev->state);
+ if (dev->udev->state == USB_STATE_NOTATTACHED) {
+ dbg(1," %s : udev is not attached", __FUNCTION__);
+ goto exit;
+ }
+
+ /* shutdown transfer */
+ usb_unlink_urb(dev->interrupt_in_urb);
+ usb_unlink_urb(dev->interrupt_out_urb);
+
+exit:
+ dbg(2," %s : leave", __FUNCTION__);
+}
+
+static void adu_delete(struct adu_device *dev)
+{
+ dbg(2, "%s enter", __FUNCTION__);
+
+ adu_abort_transfers(dev);
+
+ /* free data structures */
+ usb_free_urb(dev->interrupt_in_urb);
+ usb_free_urb(dev->interrupt_out_urb);
+ kfree(dev->read_buffer_primary);
+ kfree(dev->read_buffer_secondary);
+ kfree(dev->interrupt_in_buffer);
+ kfree(dev->interrupt_out_buffer);
+ kfree(dev);
+
+ dbg(2, "%s : leave", __FUNCTION__);
+}
+
+static void adu_interrupt_in_callback(struct urb *urb, struct pt_regs *regs)
+{
+ struct adu_device *dev = urb->context;
+
+ dbg(4," %s : enter, status %d", __FUNCTION__, urb->status);
+ adu_debug_data(5, __FUNCTION__, urb->actual_length,
+ urb->transfer_buffer);
+
+ spin_lock(&dev->buflock);
+
+ if (urb->status != 0) {
+ if ((urb->status != -ENOENT) && (urb->status != -ECONNRESET)) {
+ dbg(1," %s : nonzero status received: %d",
+ __FUNCTION__, urb->status);
+ }
+ goto exit;
+ }
+
+ if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
+ if (dev->read_buffer_length <
+ (4 * le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize)) -
+ (urb->actual_length)) {
+ memcpy (dev->read_buffer_primary +
+ dev->read_buffer_length,
+ dev->interrupt_in_buffer, urb->actual_length);
+
+ dev->read_buffer_length += urb->actual_length;
+ dbg(2," %s reading %d ", __FUNCTION__,
+ urb->actual_length);
+ } else {
+ dbg(1," %s : read_buffer overflow", __FUNCTION__);
+ }
+ }
+
+exit:
+ dev->read_urb_finished = 1;
+ spin_unlock(&dev->buflock);
+ /* always wake up so we recover from errors */
+ wake_up_interruptible(&dev->read_wait);
+ adu_debug_data(5, __FUNCTION__, urb->actual_length,
+ urb->transfer_buffer);
+ dbg(4," %s : leave, status %d", __FUNCTION__, urb->status);
+}
+
+static void adu_interrupt_out_callback(struct urb *urb, struct pt_regs *regs)
+{
+ struct adu_device *dev = urb->context;
+
+ dbg(4," %s : enter, status %d", __FUNCTION__, urb->status);
+ adu_debug_data(5,__FUNCTION__, urb->actual_length, urb->transfer_buffer);
+
+ if (urb->status != 0) {
+ if ((urb->status != -ENOENT) &&
+ (urb->status != -ECONNRESET)) {
+ dbg(1, " %s :nonzero status received: %d",
+ __FUNCTION__, urb->status);
+ }
+ goto exit;
+ }
+
+ wake_up_interruptible(&dev->write_wait);
+exit:
+
+ adu_debug_data(5, __FUNCTION__, urb->actual_length,
+ urb->transfer_buffer);
+ dbg(4," %s : leave, status %d", __FUNCTION__, urb->status);
+}
+
+static int adu_open(struct inode *inode, struct file *file)
+{
+ struct adu_device *dev = NULL;
+ struct usb_interface *interface;
+ int subminor;
+ int retval = 0;
+
+ dbg(2,"%s : enter", __FUNCTION__);
+
+ subminor = iminor(inode);
+
+ mutex_lock(&disconnect_mutex);
+
+ interface = usb_find_interface(&adu_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 */
+ if ((retval = down_interruptible(&dev->sem))) {
+ dbg(2, "%s : sem down failed", __FUNCTION__);
+ goto exit_no_device;
+ }
+
+ /* increment our usage count for the device */
+ ++dev->open_count;
+ dbg(2,"%s : open count %d", __FUNCTION__, dev->open_count);
+
+ /* save device in the file's private structure */
+ file->private_data = dev;
+
+ /* initialize in direction */
+ dev->read_buffer_length = 0;
+
+ /* fixup first read by having urb waiting for it */
+ usb_fill_int_urb(dev->interrupt_in_urb,dev->udev,
+ usb_rcvintpipe(dev->udev,
+ dev->interrupt_in_endpoint->bEndpointAddress),
+ dev->interrupt_in_buffer,
+ le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
+ adu_interrupt_in_callback, dev,
+ dev->interrupt_in_endpoint->bInterval);
+ /* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
+ dev->read_urb_finished = 0;
+ usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
+ /* we ignore failure */
+ /* end of fixup for first read */
+
+ up(&dev->sem);
+
+exit_no_device:
+ mutex_unlock(&disconnect_mutex);
+ dbg(2,"%s : leave, return value %d ", __FUNCTION__, retval);
+
+ return retval;
+}
+
+static int adu_release_internal(struct adu_device *dev)
+{
+ int retval = 0;
+
+ dbg(2," %s : enter", __FUNCTION__);
+
+ if (dev->udev == NULL) {
+ /* the device was unplugged before the file was released */
+ adu_delete(dev);
+ goto exit;
+ }
+
+ /* decrement our usage count for the device */
+ --dev->open_count;
+ dbg(2," %s : open count %d", __FUNCTION__, dev->open_count);
+ if (dev->open_count <= 0) {
+ adu_abort_transfers(dev);
+ dev->open_count = 0;
+ }
+
+exit:
+ dbg(2," %s : leave", __FUNCTION__);
+ return retval;
+}
+
+static int adu_release(struct inode *inode, struct file *file)
+{
+ struct adu_device *dev = NULL;
+ int retval = 0;
+
+ dbg(2," %s : enter", __FUNCTION__);
+
+ if (file == NULL) {
+ dbg(1," %s : file is NULL", __FUNCTION__);
+ retval = -ENODEV;
+ goto exit;
+ }
+
+ dev = file->private_data;
+
+ if (dev == NULL) {
+ dbg(1," %s : object is NULL", __FUNCTION__);
+ retval = -ENODEV;
+ goto exit;
+ }
+
+ /* lock our device */
+ down(&dev->sem); /* not interruptible */
+
+ if (dev->open_count <= 0) {
+ dbg(1," %s : device not opened", __FUNCTION__);
+ retval = -ENODEV;
+ goto exit;
+ }
+
+ /* do the work */
+ retval = adu_release_internal(dev);
+
+exit:
+ up(&dev->sem);
+ dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
+ return retval;
+}
+
+static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
+ loff_t *ppos)
+{
+ struct adu_device *dev;
+ size_t bytes_read = 0;
+ size_t bytes_to_read = count;
+ int i;
+ int retval = 0;
+ int timeout = 0;
+ int should_submit = 0;
+ unsigned long flags;
+ DECLARE_WAITQUEUE(wait, current);
+
+ dbg(2," %s : enter, count = %Zd, file=%p", __FUNCTION__, count, file);
+
+ dev = file->private_data;
+ dbg(2," %s : dev=%p", __FUNCTION__, dev);
+ /* lock this object */
+ if (down_interruptible(&dev->sem))
+ return -ERESTARTSYS;
+
+ /* verify that the device wasn't unplugged */
+ if (dev->udev == NULL || dev->minor == 0) {
+ retval = -ENODEV;
+ err("No device or device unplugged %d", retval);
+ goto exit;
+ }
+
+ /* verify that some data was requested */
+ if (count == 0) {
+ dbg(1," %s : read request of 0 bytes", __FUNCTION__);
+ goto exit;
+ }
+
+ timeout = COMMAND_TIMEOUT;
+ dbg(2," %s : about to start looping", __FUNCTION__);
+ while (bytes_to_read) {
+ int data_in_secondary = dev->secondary_tail - dev->secondary_head;
+ dbg(2," %s : while, data_in_secondary=%d, status=%d",
+ __FUNCTION__, data_in_secondary,
+ dev->interrupt_in_urb->status);
+
+ if (data_in_secondary) {
+ /* drain secondary buffer */
+ int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
+ i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
+ if (i < 0) {
+ retval = -EFAULT;
+ goto exit;
+ }
+ dev->secondary_head += (amount - i);
+ bytes_read += (amount - i);
+ bytes_to_read -= (amount - i);
+ if (i) {
+ retval = bytes_read ? bytes_read : -EFAULT;
+ goto exit;
+ }
+ } else {
+ /* we check the primary buffer */
+ spin_lock_irqsave (&dev->buflock, flags);
+ if (dev->read_buffer_length) {
+ /* we secure access to the primary */
+ char *tmp;
+ dbg(2," %s : swap, read_buffer_length = %d",
+ __FUNCTION__, dev->read_buffer_length);
+ tmp = dev->read_buffer_secondary;
+ dev->read_buffer_secondary = dev->read_buffer_primary;
+ dev->read_buffer_primary = tmp;
+ dev->secondary_head = 0;
+ dev->secondary_tail = dev->read_buffer_length;
+ dev->read_buffer_length = 0;
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ /* we have a free buffer so use it */
+ should_submit = 1;
+ } else {
+ /* even the primary was empty - we may need to do IO */
+ if (dev->interrupt_in_urb->status == -EINPROGRESS) {
+ /* somebody is doing IO */
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ dbg(2," %s : submitted already", __FUNCTION__);
+ } else {
+ /* we must initiate input */
+ dbg(2," %s : initiate input", __FUNCTION__);
+ dev->read_urb_finished = 0;
+
+ usb_fill_int_urb(dev->interrupt_in_urb,dev->udev,
+ usb_rcvintpipe(dev->udev,
+ dev->interrupt_in_endpoint->bEndpointAddress),
+ dev->interrupt_in_buffer,
+ le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
+ adu_interrupt_in_callback,
+ dev,
+ dev->interrupt_in_endpoint->bInterval);
+ retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
+ if (!retval) {
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ dbg(2," %s : submitted OK", __FUNCTION__);
+ } else {
+ if (retval == -ENOMEM) {
+ retval = bytes_read ? bytes_read : -ENOMEM;
+ }
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ dbg(2," %s : submit failed", __FUNCTION__);
+ goto exit;
+ }
+ }
+
+ /* we wait for I/O to complete */
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&dev->read_wait, &wait);
+ if (!dev->read_urb_finished)
+ timeout = schedule_timeout(COMMAND_TIMEOUT);
+ else
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&dev->read_wait, &wait);
+
+ if (timeout <= 0) {
+ dbg(2," %s : timeout", __FUNCTION__);
+ retval = bytes_read ? bytes_read : -ETIMEDOUT;
+ goto exit;
+ }
+
+ if (signal_pending(current)) {
+ dbg(2," %s : signal pending", __FUNCTION__);
+ retval = bytes_read ? bytes_read : -EINTR;
+ goto exit;
+ }
+ }
+ }
+ }
+
+ retval = bytes_read;
+ /* if the primary buffer is empty then use it */
+ if (should_submit && !dev->interrupt_in_urb->status==-EINPROGRESS) {
+ usb_fill_int_urb(dev->interrupt_in_urb,dev->udev,
+ usb_rcvintpipe(dev->udev,
+ dev->interrupt_in_endpoint->bEndpointAddress),
+ dev->interrupt_in_buffer,
+ le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
+ adu_interrupt_in_callback,
+ dev,
+ dev->interrupt_in_endpoint->bInterval);
+ /* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
+ dev->read_urb_finished = 0;
+ usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
+ /* we ignore failure */
+ }
+
+exit:
+ /* unlock the device */
+ up(&dev->sem);
+
+ dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
+ return retval;
+}
+
+static ssize_t adu_write(struct file *file, const __user char *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct adu_device *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 = %Zd", __FUNCTION__, count);
+
+ dev = file->private_data;
+
+ /* lock this object */
+ down_interruptible(&dev->sem);
+
+ /* verify that the device wasn't unplugged */
+ if (dev->udev == NULL || dev->minor == 0) {
+ 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", __FUNCTION__);
+ 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", __FUNCTION__);
+ retval = -EINTR;
+ goto exit;
+ }
+ up(&dev->sem);
+ timeout = interruptible_sleep_on_timeout(&dev->write_wait, timeout);
+ down_interruptible(&dev->sem);
+ if (timeout > 0) {
+ break;
+ }
+ dbg(1," %s : interrupted timeout: %d", __FUNCTION__, timeout);
+ }
+
+
+ dbg(1," %s : final timeout: %d", __FUNCTION__, timeout);
+
+ if (timeout == 0) {
+ dbg(1, "%s - command timed out.", __FUNCTION__);
+ retval = -ETIMEDOUT;
+ goto exit;
+ }
+
+ dbg(4," %s : in progress, count = %Zd", __FUNCTION__, count);
+
+ } else {
+ dbg(4," %s : sending, count = %Zd", __FUNCTION__, count);
+
+ /* write the data into interrupt_out_buffer from userspace */
+ buffer_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
+ bytes_to_write = count > buffer_size ? buffer_size : count;
+ dbg(4," %s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd",
+ __FUNCTION__, 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,
+ adu_interrupt_out_callback,
+ dev,
+ dev->interrupt_in_endpoint->bInterval);
+ /* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
+ 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", __FUNCTION__, retval);
+
+ return retval;
+}
+
+/* file operations needed when we register this driver */
+static struct file_operations adu_fops = {
+ .owner = THIS_MODULE,
+ .read = adu_read,
+ .write = adu_write,
+ .open = adu_open,
+ .release = adu_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 adu_class = {
+ .name = "usb/adutux%d",
+ .fops = &adu_fops,
+ .minor_base = ADU_MINOR_BASE,
+};
+
+/**
+ * adu_probe
+ *
+ * Called by the usb core when a new device is connected that it thinks
+ * this driver might be interested in.
+ */
+static int adu_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct usb_device *udev = interface_to_usbdev(interface);
+ struct adu_device *dev = NULL;
+ struct usb_host_interface *iface_desc;
+ struct usb_endpoint_descriptor *endpoint;
+ int retval = -ENODEV;
+ int in_end_size;
+ int out_end_size;
+ int i;
+
+ dbg(2," %s : enter", __FUNCTION__);
+
+ if (udev == NULL) {
+ dev_err(&interface->dev, "udev is NULL.\n");
+ goto exit;
+ }
+
+ /* allocate memory for our device state and intialize it */
+ dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL);
+ if (dev == NULL) {
+ dev_err(&interface->dev, "Out of memory\n");
+ retval = -ENOMEM;
+ goto exit;
+ }
+
+ init_MUTEX(&dev->sem);
+ spin_lock_init(&dev->buflock);
+ dev->udev = udev;
+ init_waitqueue_head(&dev->read_wait);
+ init_waitqueue_head(&dev->write_wait);
+
+ 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 (usb_endpoint_is_int_in(endpoint))
+ dev->interrupt_in_endpoint = endpoint;
+
+ if (usb_endpoint_is_int_out(endpoint))
+ dev->interrupt_out_endpoint = endpoint;
+ }
+ if (dev->interrupt_in_endpoint == NULL) {
+ dev_err(&interface->dev, "interrupt in endpoint not found\n");
+ goto error;
+ }
+ if (dev->interrupt_out_endpoint == NULL) {
+ dev_err(&interface->dev, "interrupt out endpoint not found\n");
+ goto error;
+ }
+
+ in_end_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
+ out_end_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
+
+ dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
+ if (!dev->read_buffer_primary) {
+ dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n");
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ /* debug code prime the buffer */
+ memset(dev->read_buffer_primary, 'a', in_end_size);
+ memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size);
+ memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size);
+ memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size);
+
+ dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL);
+ if (!dev->read_buffer_secondary) {
+ dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n");
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ /* debug code prime the buffer */
+ memset(dev->read_buffer_secondary, 'e', in_end_size);
+ memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size);
+ memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size);
+ memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size);
+
+ dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL);
+ if (!dev->interrupt_in_buffer) {
+ dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n");
+ goto error;
+ }
+
+ /* debug code prime the buffer */
+ memset(dev->interrupt_in_buffer, 'i', in_end_size);
+
+ dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!dev->interrupt_in_urb) {
+ dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
+ goto error;
+ }
+ dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL);
+ if (!dev->interrupt_out_buffer) {
+ dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n");
+ goto error;
+ }
+ dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!dev->interrupt_out_urb) {
+ dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n");
+ goto error;
+ }
+
+ if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number,
+ sizeof(dev->serial_number))) {
+ dev_err(&interface->dev, "Could not retrieve serial number\n");
+ goto error;
+ }
+ dbg(2," %s : serial_number=%s", __FUNCTION__, dev->serial_number);
+
+ /* we can register the device now, as it is ready */
+ usb_set_intfdata(interface, dev);
+
+ retval = usb_register_dev(interface, &adu_class);
+
+ if (retval) {
+ /* something prevented us from registering this driver */
+ dev_err(&interface->dev, "Not able to get a minor for this device.\n");
+ usb_set_intfdata(interface, NULL);
+ goto error;
+ }
+
+ dev->minor = interface->minor;
+
+ /* let the user know what node this device is now attached to */
+ dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d",
+ udev->descriptor.idProduct, dev->serial_number,
+ (dev->minor - ADU_MINOR_BASE));
+exit:
+ dbg(2," %s : leave, return value %p (dev)", __FUNCTION__, dev);
+
+ return retval;
+
+error:
+ adu_delete(dev);
+ return retval;
+}
+
+/**
+ * adu_disconnect
+ *
+ * Called by the usb core when the device is removed from the system.
+ */
+static void adu_disconnect(struct usb_interface *interface)
+{
+ struct adu_device *dev;
+ int minor;
+
+ dbg(2," %s : enter", __FUNCTION__);
+
+ mutex_lock(&disconnect_mutex); /* not interruptible */
+
+ dev = usb_get_intfdata(interface);
+ usb_set_intfdata(interface, NULL);
+
+ down(&dev->sem); /* not interruptible */
+
+ minor = dev->minor;
+
+ /* give back our minor */
+ usb_deregister_dev(interface, &adu_class);
+ dev->minor = 0;
+
+ /* if the device is not opened, then we clean up right now */
+ dbg(2," %s : open count %d", __FUNCTION__, dev->open_count);
+ if (!dev->open_count) {
+ up(&dev->sem);
+ adu_delete(dev);
+ } else {
+ dev->udev = NULL;
+ up(&dev->sem);
+ }
+
+ mutex_unlock(&disconnect_mutex);
+
+ dev_info(&interface->dev, "ADU device adutux%d now disconnected",
+ (minor - ADU_MINOR_BASE));
+
+ dbg(2," %s : leave", __FUNCTION__);
+}
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver adu_driver = {
+ .name = "adutux",
+ .probe = adu_probe,
+ .disconnect = adu_disconnect,
+ .id_table = device_table,
+};
+
+static int __init adu_init(void)
+{
+ int result;
+
+ dbg(2," %s : enter", __FUNCTION__);
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&adu_driver);
+ if (result < 0) {
+ err("usb_register failed for the "__FILE__" driver. "
+ "Error number %d", result);
+ goto exit;
+ }
+
+ info("adutux " DRIVER_DESC " " DRIVER_VERSION);
+ info("adutux is an experimental driver. Use at your own risk");
+
+exit:
+ dbg(2," %s : leave, return value %d", __FUNCTION__, result);
+
+ return result;
+}
+
+static void __exit adu_exit(void)
+{
+ dbg(2," %s : enter", __FUNCTION__);
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&adu_driver);
+ dbg(2," %s : leave", __FUNCTION__);
+}
+
+module_init(adu_init);
+module_exit(adu_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
projects / GitHub / LineageOS / G12 / android_kernel_amlogic_linux-4.9.git / commitdiff