| /* |
| * LEGO USB Tower driver |
| * |
| * Copyright (C) 2003 David Glance <davidgsf@sourceforge.net> |
| * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> |
| * |
| * 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 (greg@kroah.com) |
| * |
| * 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 (david@csse.uwa.edu.au) |
| * - 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 __func__ |
| * 2003-01-12 - 0.53 david (david@csse.uwa.edu.au) |
| * - 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 (david@csse.uwa.edu.au) |
| * - initial import into LegoUSB project |
| * - merge of existing LegoUSB.c driver |
| * 2003-07-18 - 0.56 davidgsf (david@csse.uwa.edu.au) |
| * - port to 2.6 style driver |
| * 2004-02-29 - 0.6 Juergen Stuber <starblue@users.sourceforge.net> |
| * - fix locking |
| * - unlink read URBs which are no longer needed |
| * - allow increased buffer size, eliminates need for timeout on write |
| * - have read URB running continuously |
| * - added poll |
| * - forbid seeking |
| * - added nonblocking I/O |
| * - changed back __func__ to __func__ |
| * - read and log tower firmware version |
| * - reset tower on probe, avoids failure of first write |
| * 2004-03-09 - 0.7 Juergen Stuber <starblue@users.sourceforge.net> |
| * - timeout read now only after inactivity, shorten default accordingly |
| * 2004-03-11 - 0.8 Juergen Stuber <starblue@users.sourceforge.net> |
| * - log major, minor instead of possibly confusing device filename |
| * - whitespace cleanup |
| * 2004-03-12 - 0.9 Juergen Stuber <starblue@users.sourceforge.net> |
| * - normalize whitespace in debug messages |
| * - take care about endianness in control message responses |
| * 2004-03-13 - 0.91 Juergen Stuber <starblue@users.sourceforge.net> |
| * - make default intervals longer to accommodate current EHCI driver |
| * 2004-03-19 - 0.92 Juergen Stuber <starblue@users.sourceforge.net> |
| * - replaced atomic_t by memory barriers |
| * 2004-04-21 - 0.93 Juergen Stuber <starblue@users.sourceforge.net> |
| * - wait for completion of write urb in release (needed for remotecontrol) |
| * - corrected poll for write direction (missing negation) |
| * 2004-04-22 - 0.94 Juergen Stuber <starblue@users.sourceforge.net> |
| * - make device locking interruptible |
| * 2004-04-30 - 0.95 Juergen Stuber <starblue@users.sourceforge.net> |
| * - check for valid udev on resubmitting and unlinking urbs |
| * 2004-08-03 - 0.96 Juergen Stuber <starblue@users.sourceforge.net> |
| * - move reset into open to clean out spurious data |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/completion.h> |
| #include <linux/mutex.h> |
| #include <linux/uaccess.h> |
| #include <linux/usb.h> |
| #include <linux/poll.h> |
| |
| |
| #define DRIVER_AUTHOR "Juergen Stuber <starblue@sourceforge.net>" |
| #define DRIVER_DESC "LEGO USB Tower Driver" |
| |
| |
| /* The defaults are chosen to work with the latest versions of leJOS and NQC. |
| */ |
| |
| /* Some legacy software likes to receive packets in one piece. |
| * In this case read_buffer_size should exceed the maximal packet length |
| * (417 for datalog uploads), and packet_timeout should be set. |
| */ |
| static int read_buffer_size = 480; |
| module_param(read_buffer_size, int, 0); |
| MODULE_PARM_DESC(read_buffer_size, "Read buffer size"); |
| |
| /* Some legacy software likes to send packets in one piece. |
| * In this case write_buffer_size should exceed the maximal packet length |
| * (417 for firmware and program downloads). |
| * A problem with long writes is that the following read may time out |
| * if the software is not prepared to wait long enough. |
| */ |
| static int write_buffer_size = 480; |
| module_param(write_buffer_size, int, 0); |
| MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); |
| |
| /* Some legacy software expects reads to contain whole LASM packets. |
| * To achieve this, characters which arrive before a packet timeout |
| * occurs will be returned in a single read operation. |
| * A problem with long reads is that the software may time out |
| * if it is not prepared to wait long enough. |
| * The packet timeout should be greater than the time between the |
| * reception of subsequent characters, which should arrive about |
| * every 5ms for the standard 2400 baud. |
| * Set it to 0 to disable. |
| */ |
| static int packet_timeout = 50; |
| module_param(packet_timeout, int, 0); |
| MODULE_PARM_DESC(packet_timeout, "Packet timeout in ms"); |
| |
| /* Some legacy software expects blocking reads to time out. |
| * Timeout occurs after the specified time of read and write inactivity. |
| * Set it to 0 to disable. |
| */ |
| static int read_timeout = 200; |
| module_param(read_timeout, int, 0); |
| MODULE_PARM_DESC(read_timeout, "Read timeout in ms"); |
| |
| /* As of kernel version 2.6.4 ehci-hcd uses an |
| * "only one interrupt transfer per frame" shortcut |
| * to simplify the scheduling of periodic transfers. |
| * This conflicts with our standard 1ms intervals for in and out URBs. |
| * We use default intervals of 2ms for in and 8ms for out transfers, |
| * which is fast enough for 2400 baud and allows a small additional load. |
| * Increase the interval to allow more devices that do interrupt transfers, |
| * or set to 0 to use the standard interval from the endpoint descriptors. |
| */ |
| static int interrupt_in_interval = 2; |
| module_param(interrupt_in_interval, int, 0); |
| MODULE_PARM_DESC(interrupt_in_interval, "Interrupt in interval in ms"); |
| |
| static int interrupt_out_interval = 8; |
| module_param(interrupt_out_interval, int, 0); |
| MODULE_PARM_DESC(interrupt_out_interval, "Interrupt out interval in ms"); |
| |
| /* Define these values to match your device */ |
| #define LEGO_USB_TOWER_VENDOR_ID 0x0694 |
| #define LEGO_USB_TOWER_PRODUCT_ID 0x0001 |
| |
| /* Vendor requests */ |
| #define LEGO_USB_TOWER_REQUEST_RESET 0x04 |
| #define LEGO_USB_TOWER_REQUEST_GET_VERSION 0xFD |
| |
| struct tower_reset_reply { |
| __le16 size; /* little-endian */ |
| __u8 err_code; |
| __u8 spare; |
| } __attribute__ ((packed)); |
| |
| struct tower_get_version_reply { |
| __le16 size; /* little-endian */ |
| __u8 err_code; |
| __u8 spare; |
| __u8 major; |
| __u8 minor; |
| __le16 build_no; /* little-endian */ |
| } __attribute__ ((packed)); |
| |
| |
| /* table of devices that work with this driver */ |
| static const 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); |
| |
| #define LEGO_USB_TOWER_MINOR_BASE 160 |
| |
| |
| /* Structure to hold all of our device specific stuff */ |
| struct lego_usb_tower { |
| struct mutex lock; /* locks this structure */ |
| struct usb_device* udev; /* save off the usb device pointer */ |
| unsigned char minor; /* the starting minor number for this device */ |
| |
| int open_count; /* number of times this port has been opened */ |
| unsigned long disconnected:1; |
| |
| char* read_buffer; |
| size_t read_buffer_length; /* this much came in */ |
| size_t read_packet_length; /* this much will be returned on read */ |
| spinlock_t read_buffer_lock; |
| int packet_timeout_jiffies; |
| unsigned long read_last_arrival; |
| |
| 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 interrupt_in_interval; |
| int interrupt_in_running; |
| int interrupt_in_done; |
| |
| char* interrupt_out_buffer; |
| struct usb_endpoint_descriptor* interrupt_out_endpoint; |
| struct urb* interrupt_out_urb; |
| int interrupt_out_interval; |
| int interrupt_out_busy; |
| |
| }; |
| |
| |
| /* local function prototypes */ |
| static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos); |
| static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos); |
| 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 unsigned int tower_poll (struct file *file, poll_table *wait); |
| static loff_t tower_llseek (struct file *file, loff_t off, int whence); |
| |
| static void tower_abort_transfers (struct lego_usb_tower *dev); |
| static void tower_check_for_read_packet (struct lego_usb_tower *dev); |
| static void tower_interrupt_in_callback (struct urb *urb); |
| static void tower_interrupt_out_callback (struct urb *urb); |
| |
| static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id); |
| static void tower_disconnect (struct usb_interface *interface); |
| |
| |
| /* file operations needed when we register this driver */ |
| static const struct file_operations tower_fops = { |
| .owner = THIS_MODULE, |
| .read = tower_read, |
| .write = tower_write, |
| .open = tower_open, |
| .release = tower_release, |
| .poll = tower_poll, |
| .llseek = tower_llseek, |
| }; |
| |
| static char *legousbtower_devnode(struct device *dev, umode_t *mode) |
| { |
| return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); |
| } |
| |
| /* |
| * 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 tower_class = { |
| .name = "legousbtower%d", |
| .devnode = legousbtower_devnode, |
| .fops = &tower_fops, |
| .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 = { |
| .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(struct device *dev, |
| const char *function, int size, |
| const unsigned char *data) |
| { |
| dev_dbg(dev, "%s - length = %d, data = %*ph\n", |
| function, size, size, data); |
| } |
| |
| |
| /** |
| * tower_delete |
| */ |
| static inline void tower_delete (struct lego_usb_tower *dev) |
| { |
| /* free data structures */ |
| usb_free_urb(dev->interrupt_in_urb); |
| usb_free_urb(dev->interrupt_out_urb); |
| kfree (dev->read_buffer); |
| kfree (dev->interrupt_in_buffer); |
| kfree (dev->interrupt_out_buffer); |
| usb_put_dev(dev->udev); |
| kfree (dev); |
| } |
| |
| |
| /** |
| * 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; |
| struct tower_reset_reply *reset_reply; |
| int result; |
| |
| reset_reply = kmalloc(sizeof(*reset_reply), GFP_KERNEL); |
| |
| if (!reset_reply) { |
| retval = -ENOMEM; |
| goto exit; |
| } |
| |
| nonseekable_open(inode, file); |
| subminor = iminor(inode); |
| |
| interface = usb_find_interface (&tower_driver, subminor); |
| |
| if (!interface) { |
| pr_err("error, can't find device for minor %d\n", subminor); |
| retval = -ENODEV; |
| goto exit; |
| } |
| |
| dev = usb_get_intfdata(interface); |
| if (!dev) { |
| retval = -ENODEV; |
| goto exit; |
| } |
| |
| /* lock this device */ |
| if (mutex_lock_interruptible(&dev->lock)) { |
| retval = -ERESTARTSYS; |
| goto exit; |
| } |
| |
| |
| /* allow opening only once */ |
| if (dev->open_count) { |
| retval = -EBUSY; |
| goto unlock_exit; |
| } |
| |
| /* reset the tower */ |
| result = usb_control_msg (dev->udev, |
| usb_rcvctrlpipe(dev->udev, 0), |
| LEGO_USB_TOWER_REQUEST_RESET, |
| USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, |
| 0, |
| 0, |
| reset_reply, |
| sizeof(*reset_reply), |
| 1000); |
| if (result < 0) { |
| dev_err(&dev->udev->dev, |
| "LEGO USB Tower reset control request failed\n"); |
| retval = result; |
| goto unlock_exit; |
| } |
| |
| /* initialize in direction */ |
| dev->read_buffer_length = 0; |
| dev->read_packet_length = 0; |
| usb_fill_int_urb (dev->interrupt_in_urb, |
| dev->udev, |
| usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress), |
| dev->interrupt_in_buffer, |
| usb_endpoint_maxp(dev->interrupt_in_endpoint), |
| tower_interrupt_in_callback, |
| dev, |
| dev->interrupt_in_interval); |
| |
| dev->interrupt_in_running = 1; |
| dev->interrupt_in_done = 0; |
| mb(); |
| |
| retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL); |
| if (retval) { |
| dev_err(&dev->udev->dev, |
| "Couldn't submit interrupt_in_urb %d\n", retval); |
| dev->interrupt_in_running = 0; |
| goto unlock_exit; |
| } |
| |
| /* save device in the file's private structure */ |
| file->private_data = dev; |
| |
| dev->open_count = 1; |
| |
| unlock_exit: |
| mutex_unlock(&dev->lock); |
| |
| exit: |
| kfree(reset_reply); |
| return retval; |
| } |
| |
| /** |
| * tower_release |
| */ |
| static int tower_release (struct inode *inode, struct file *file) |
| { |
| struct lego_usb_tower *dev; |
| int retval = 0; |
| |
| dev = file->private_data; |
| |
| if (dev == NULL) { |
| retval = -ENODEV; |
| goto exit; |
| } |
| |
| mutex_lock(&dev->lock); |
| |
| if (dev->open_count != 1) { |
| dev_dbg(&dev->udev->dev, "%s: device not opened exactly once\n", |
| __func__); |
| retval = -ENODEV; |
| goto unlock_exit; |
| } |
| |
| if (dev->disconnected) { |
| /* the device was unplugged before the file was released */ |
| |
| /* unlock here as tower_delete frees dev */ |
| mutex_unlock(&dev->lock); |
| tower_delete (dev); |
| goto exit; |
| } |
| |
| /* wait until write transfer is finished */ |
| if (dev->interrupt_out_busy) { |
| wait_event_interruptible_timeout (dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); |
| } |
| tower_abort_transfers (dev); |
| dev->open_count = 0; |
| |
| unlock_exit: |
| mutex_unlock(&dev->lock); |
| exit: |
| return retval; |
| } |
| |
| |
| /** |
| * tower_abort_transfers |
| * aborts transfers and frees associated data structures |
| */ |
| static void tower_abort_transfers (struct lego_usb_tower *dev) |
| { |
| if (dev == NULL) |
| return; |
| |
| /* shutdown transfer */ |
| if (dev->interrupt_in_running) { |
| dev->interrupt_in_running = 0; |
| mb(); |
| usb_kill_urb(dev->interrupt_in_urb); |
| } |
| if (dev->interrupt_out_busy) |
| usb_kill_urb(dev->interrupt_out_urb); |
| } |
| |
| |
| /** |
| * tower_check_for_read_packet |
| * |
| * To get correct semantics for signals and non-blocking I/O |
| * with packetizing we pretend not to see any data in the read buffer |
| * until it has been there unchanged for at least |
| * dev->packet_timeout_jiffies, or until the buffer is full. |
| */ |
| static void tower_check_for_read_packet (struct lego_usb_tower *dev) |
| { |
| spin_lock_irq (&dev->read_buffer_lock); |
| if (!packet_timeout |
| || time_after(jiffies, dev->read_last_arrival + dev->packet_timeout_jiffies) |
| || dev->read_buffer_length == read_buffer_size) { |
| dev->read_packet_length = dev->read_buffer_length; |
| } |
| dev->interrupt_in_done = 0; |
| spin_unlock_irq (&dev->read_buffer_lock); |
| } |
| |
| |
| /** |
| * tower_poll |
| */ |
| static unsigned int tower_poll (struct file *file, poll_table *wait) |
| { |
| struct lego_usb_tower *dev; |
| unsigned int mask = 0; |
| |
| dev = file->private_data; |
| |
| if (dev->disconnected) |
| return POLLERR | POLLHUP; |
| |
| poll_wait(file, &dev->read_wait, wait); |
| poll_wait(file, &dev->write_wait, wait); |
| |
| tower_check_for_read_packet(dev); |
| if (dev->read_packet_length > 0) { |
| mask |= POLLIN | POLLRDNORM; |
| } |
| if (!dev->interrupt_out_busy) { |
| mask |= POLLOUT | POLLWRNORM; |
| } |
| |
| return mask; |
| } |
| |
| |
| /** |
| * tower_llseek |
| */ |
| static loff_t tower_llseek (struct file *file, loff_t off, int whence) |
| { |
| return -ESPIPE; /* unseekable */ |
| } |
| |
| |
| /** |
| * tower_read |
| */ |
| static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos) |
| { |
| struct lego_usb_tower *dev; |
| size_t bytes_to_read; |
| int i; |
| int retval = 0; |
| unsigned long timeout = 0; |
| |
| dev = file->private_data; |
| |
| /* lock this object */ |
| if (mutex_lock_interruptible(&dev->lock)) { |
| retval = -ERESTARTSYS; |
| goto exit; |
| } |
| |
| /* verify that the device wasn't unplugged */ |
| if (dev->disconnected) { |
| retval = -ENODEV; |
| pr_err("No device or device unplugged %d\n", retval); |
| goto unlock_exit; |
| } |
| |
| /* verify that we actually have some data to read */ |
| if (count == 0) { |
| dev_dbg(&dev->udev->dev, "read request of 0 bytes\n"); |
| goto unlock_exit; |
| } |
| |
| if (read_timeout) { |
| timeout = jiffies + msecs_to_jiffies(read_timeout); |
| } |
| |
| /* wait for data */ |
| tower_check_for_read_packet (dev); |
| while (dev->read_packet_length == 0) { |
| if (file->f_flags & O_NONBLOCK) { |
| retval = -EAGAIN; |
| goto unlock_exit; |
| } |
| retval = wait_event_interruptible_timeout(dev->read_wait, dev->interrupt_in_done, dev->packet_timeout_jiffies); |
| if (retval < 0) { |
| goto unlock_exit; |
| } |
| |
| /* reset read timeout during read or write activity */ |
| if (read_timeout |
| && (dev->read_buffer_length || dev->interrupt_out_busy)) { |
| timeout = jiffies + msecs_to_jiffies(read_timeout); |
| } |
| /* check for read timeout */ |
| if (read_timeout && time_after (jiffies, timeout)) { |
| retval = -ETIMEDOUT; |
| goto unlock_exit; |
| } |
| tower_check_for_read_packet (dev); |
| } |
| |
| /* copy the data from read_buffer into userspace */ |
| bytes_to_read = min(count, dev->read_packet_length); |
| |
| if (copy_to_user (buffer, dev->read_buffer, bytes_to_read)) { |
| retval = -EFAULT; |
| goto unlock_exit; |
| } |
| |
| spin_lock_irq (&dev->read_buffer_lock); |
| dev->read_buffer_length -= bytes_to_read; |
| dev->read_packet_length -= bytes_to_read; |
| for (i=0; i<dev->read_buffer_length; i++) { |
| dev->read_buffer[i] = dev->read_buffer[i+bytes_to_read]; |
| } |
| spin_unlock_irq (&dev->read_buffer_lock); |
| |
| retval = bytes_to_read; |
| |
| unlock_exit: |
| /* unlock the device */ |
| mutex_unlock(&dev->lock); |
| |
| exit: |
| return retval; |
| } |
| |
| |
| /** |
| * tower_write |
| */ |
| static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
| { |
| struct lego_usb_tower *dev; |
| size_t bytes_to_write; |
| int retval = 0; |
| |
| dev = file->private_data; |
| |
| /* lock this object */ |
| if (mutex_lock_interruptible(&dev->lock)) { |
| retval = -ERESTARTSYS; |
| goto exit; |
| } |
| |
| /* verify that the device wasn't unplugged */ |
| if (dev->disconnected) { |
| retval = -ENODEV; |
| pr_err("No device or device unplugged %d\n", retval); |
| goto unlock_exit; |
| } |
| |
| /* verify that we actually have some data to write */ |
| if (count == 0) { |
| dev_dbg(&dev->udev->dev, "write request of 0 bytes\n"); |
| goto unlock_exit; |
| } |
| |
| /* wait until previous transfer is finished */ |
| while (dev->interrupt_out_busy) { |
| if (file->f_flags & O_NONBLOCK) { |
| retval = -EAGAIN; |
| goto unlock_exit; |
| } |
| retval = wait_event_interruptible (dev->write_wait, !dev->interrupt_out_busy); |
| if (retval) { |
| goto unlock_exit; |
| } |
| } |
| |
| /* write the data into interrupt_out_buffer from userspace */ |
| bytes_to_write = min_t(int, count, write_buffer_size); |
| dev_dbg(&dev->udev->dev, "%s: count = %zd, bytes_to_write = %zd\n", |
| __func__, count, bytes_to_write); |
| |
| if (copy_from_user (dev->interrupt_out_buffer, buffer, bytes_to_write)) { |
| retval = -EFAULT; |
| goto unlock_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_out_interval); |
| |
| dev->interrupt_out_busy = 1; |
| wmb(); |
| |
| retval = usb_submit_urb (dev->interrupt_out_urb, GFP_KERNEL); |
| if (retval) { |
| dev->interrupt_out_busy = 0; |
| dev_err(&dev->udev->dev, |
| "Couldn't submit interrupt_out_urb %d\n", retval); |
| goto unlock_exit; |
| } |
| retval = bytes_to_write; |
| |
| unlock_exit: |
| /* unlock the device */ |
| mutex_unlock(&dev->lock); |
| |
| exit: |
| return retval; |
| } |
| |
| |
| /** |
| * tower_interrupt_in_callback |
| */ |
| static void tower_interrupt_in_callback (struct urb *urb) |
| { |
| struct lego_usb_tower *dev = urb->context; |
| int status = urb->status; |
| int retval; |
| |
| lego_usb_tower_debug_data(&dev->udev->dev, __func__, |
| urb->actual_length, urb->transfer_buffer); |
| |
| if (status) { |
| if (status == -ENOENT || |
| status == -ECONNRESET || |
| status == -ESHUTDOWN) { |
| goto exit; |
| } else { |
| dev_dbg(&dev->udev->dev, |
| "%s: nonzero status received: %d\n", __func__, |
| status); |
| goto resubmit; /* maybe we can recover */ |
| } |
| } |
| |
| if (urb->actual_length > 0) { |
| spin_lock (&dev->read_buffer_lock); |
| if (dev->read_buffer_length + urb->actual_length < read_buffer_size) { |
| memcpy (dev->read_buffer + dev->read_buffer_length, |
| dev->interrupt_in_buffer, |
| urb->actual_length); |
| dev->read_buffer_length += urb->actual_length; |
| dev->read_last_arrival = jiffies; |
| dev_dbg(&dev->udev->dev, "%s: received %d bytes\n", |
| __func__, urb->actual_length); |
| } else { |
| pr_warn("read_buffer overflow, %d bytes dropped\n", |
| urb->actual_length); |
| } |
| spin_unlock (&dev->read_buffer_lock); |
| } |
| |
| resubmit: |
| /* resubmit if we're still running */ |
| if (dev->interrupt_in_running) { |
| retval = usb_submit_urb (dev->interrupt_in_urb, GFP_ATOMIC); |
| if (retval) |
| dev_err(&dev->udev->dev, |
| "%s: usb_submit_urb failed (%d)\n", |
| __func__, retval); |
| } |
| |
| exit: |
| dev->interrupt_in_done = 1; |
| wake_up_interruptible (&dev->read_wait); |
| } |
| |
| |
| /** |
| * tower_interrupt_out_callback |
| */ |
| static void tower_interrupt_out_callback (struct urb *urb) |
| { |
| struct lego_usb_tower *dev = urb->context; |
| int status = urb->status; |
| |
| lego_usb_tower_debug_data(&dev->udev->dev, __func__, |
| urb->actual_length, urb->transfer_buffer); |
| |
| /* sync/async unlink faults aren't errors */ |
| if (status && !(status == -ENOENT || |
| status == -ECONNRESET || |
| status == -ESHUTDOWN)) { |
| dev_dbg(&dev->udev->dev, |
| "%s: nonzero write bulk status received: %d\n", __func__, |
| status); |
| } |
| |
| dev->interrupt_out_busy = 0; |
| wake_up_interruptible(&dev->write_wait); |
| } |
| |
| |
| /** |
| * 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 device *idev = &interface->dev; |
| struct usb_device *udev = interface_to_usbdev(interface); |
| struct lego_usb_tower *dev = NULL; |
| struct tower_get_version_reply *get_version_reply = NULL; |
| int retval = -ENOMEM; |
| int result; |
| |
| /* allocate memory for our device state and initialize it */ |
| |
| dev = kmalloc (sizeof(struct lego_usb_tower), GFP_KERNEL); |
| |
| if (!dev) |
| goto exit; |
| |
| mutex_init(&dev->lock); |
| |
| dev->udev = usb_get_dev(udev); |
| dev->open_count = 0; |
| dev->disconnected = 0; |
| |
| dev->read_buffer = NULL; |
| dev->read_buffer_length = 0; |
| dev->read_packet_length = 0; |
| spin_lock_init (&dev->read_buffer_lock); |
| dev->packet_timeout_jiffies = msecs_to_jiffies(packet_timeout); |
| dev->read_last_arrival = jiffies; |
| |
| 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_in_running = 0; |
| dev->interrupt_in_done = 0; |
| |
| dev->interrupt_out_buffer = NULL; |
| dev->interrupt_out_endpoint = NULL; |
| dev->interrupt_out_urb = NULL; |
| dev->interrupt_out_busy = 0; |
| |
| result = usb_find_common_endpoints_reverse(interface->cur_altsetting, |
| NULL, NULL, |
| &dev->interrupt_in_endpoint, |
| &dev->interrupt_out_endpoint); |
| if (result) { |
| dev_err(idev, "interrupt endpoints not found\n"); |
| retval = result; |
| goto error; |
| } |
| |
| dev->read_buffer = kmalloc (read_buffer_size, GFP_KERNEL); |
| if (!dev->read_buffer) |
| goto error; |
| dev->interrupt_in_buffer = kmalloc (usb_endpoint_maxp(dev->interrupt_in_endpoint), GFP_KERNEL); |
| if (!dev->interrupt_in_buffer) |
| goto error; |
| dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!dev->interrupt_in_urb) |
| goto error; |
| dev->interrupt_out_buffer = kmalloc (write_buffer_size, GFP_KERNEL); |
| if (!dev->interrupt_out_buffer) |
| goto error; |
| dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!dev->interrupt_out_urb) |
| goto error; |
| dev->interrupt_in_interval = interrupt_in_interval ? interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; |
| dev->interrupt_out_interval = interrupt_out_interval ? interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; |
| |
| get_version_reply = kmalloc(sizeof(*get_version_reply), GFP_KERNEL); |
| |
| if (!get_version_reply) { |
| retval = -ENOMEM; |
| goto error; |
| } |
| |
| /* get the firmware version and log it */ |
| result = usb_control_msg (udev, |
| usb_rcvctrlpipe(udev, 0), |
| LEGO_USB_TOWER_REQUEST_GET_VERSION, |
| USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, |
| 0, |
| 0, |
| get_version_reply, |
| sizeof(*get_version_reply), |
| 1000); |
| if (result < sizeof(*get_version_reply)) { |
| if (result >= 0) |
| result = -EIO; |
| dev_err(idev, "get version request failed: %d\n", result); |
| retval = result; |
| goto error; |
| } |
| dev_info(&interface->dev, |
| "LEGO USB Tower firmware version is %d.%d build %d\n", |
| get_version_reply->major, |
| get_version_reply->minor, |
| le16_to_cpu(get_version_reply->build_no)); |
| |
| /* 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 */ |
| dev_err(idev, "Not able to get a minor for this device.\n"); |
| goto error; |
| } |
| dev->minor = interface->minor; |
| |
| /* let the user know what node this device is now attached to */ |
| dev_info(&interface->dev, "LEGO USB Tower #%d now attached to major " |
| "%d minor %d\n", (dev->minor - LEGO_USB_TOWER_MINOR_BASE), |
| USB_MAJOR, dev->minor); |
| |
| exit: |
| kfree(get_version_reply); |
| return retval; |
| |
| error: |
| kfree(get_version_reply); |
| 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; |
| |
| dev = usb_get_intfdata (interface); |
| |
| minor = dev->minor; |
| |
| /* give back our minor and prevent further open() */ |
| usb_deregister_dev (interface, &tower_class); |
| |
| /* stop I/O */ |
| usb_poison_urb(dev->interrupt_in_urb); |
| usb_poison_urb(dev->interrupt_out_urb); |
| |
| mutex_lock(&dev->lock); |
| |
| /* if the device is not opened, then we clean up right now */ |
| if (!dev->open_count) { |
| mutex_unlock(&dev->lock); |
| tower_delete (dev); |
| } else { |
| dev->disconnected = 1; |
| /* wake up pollers */ |
| wake_up_interruptible_all(&dev->read_wait); |
| wake_up_interruptible_all(&dev->write_wait); |
| mutex_unlock(&dev->lock); |
| } |
| |
| dev_info(&interface->dev, "LEGO USB Tower #%d now disconnected\n", |
| (minor - LEGO_USB_TOWER_MINOR_BASE)); |
| } |
| |
| module_usb_driver(tower_driver); |
| |
| MODULE_AUTHOR(DRIVER_AUTHOR); |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| #ifdef MODULE_LICENSE |
| MODULE_LICENSE("GPL"); |
| #endif |