diff options
Diffstat (limited to 'drivers/staging/frontier/tranzport.c')
| -rw-r--r-- | drivers/staging/frontier/tranzport.c | 973 |
1 files changed, 0 insertions, 973 deletions
diff --git a/drivers/staging/frontier/tranzport.c b/drivers/staging/frontier/tranzport.c deleted file mode 100644 index 2f86163d7013..000000000000 --- a/drivers/staging/frontier/tranzport.c +++ /dev/null @@ -1,973 +0,0 @@ -/* - * Frontier Designs Tranzport driver - * - * Copyright (C) 2007 Michael Taht (m@taht.net) - * - * Based on the usbled driver and ldusb drivers by - * - * Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com) - * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de> - * - * The ldusb driver was, in turn, derived from Lego USB Tower driver - * Copyright (C) 2003 David Glance <advidgsf@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, version 2. - * - */ - -/* - * This driver uses a ring buffer for time critical reading of - * interrupt in reports and provides read and write methods for - * raw interrupt reports. - */ - -/* Note: this currently uses a dumb ringbuffer for reads and writes. - * A more optimal driver would cache and kill off outstanding urbs that are - * now invalid, and ignore ones that already were in the queue but valid - * as we only have 17 commands for the tranzport. In particular this is - * key for getting lights to flash in time as otherwise many commands - * can be buffered up before the light change makes it to the interface. - */ - -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/mutex.h> - -#include <linux/uaccess.h> -#include <linux/input.h> -#include <linux/usb.h> -#include <linux/poll.h> - -/* Define these values to match your devices */ -#define VENDOR_ID 0x165b -#define PRODUCT_ID 0x8101 - -#ifdef CONFIG_USB_DYNAMIC_MINORS -#define USB_TRANZPORT_MINOR_BASE 0 -#else /* FIXME 177- is the another driver's minor - apply for a minor soon */ -#define USB_TRANZPORT_MINOR_BASE 177 -#endif - -/* table of devices that work with this driver */ -static const struct usb_device_id usb_tranzport_table[] = { - {USB_DEVICE(VENDOR_ID, PRODUCT_ID)}, - {} /* Terminating entry */ -}; - -MODULE_DEVICE_TABLE(usb, usb_tranzport_table); -MODULE_VERSION("0.35"); -MODULE_AUTHOR("Mike Taht <m@taht.net>"); -MODULE_DESCRIPTION("Tranzport USB Driver"); -MODULE_LICENSE("GPL"); -MODULE_SUPPORTED_DEVICE("Frontier Designs Tranzport Control Surface"); - -#define SUPPRESS_EXTRA_OFFLINE_EVENTS 1 -#define COMPRESS_WHEEL_EVENTS 1 -#define BUFFERED_READS 1 -#define RING_BUFFER_SIZE 1000 -#define WRITE_BUFFER_SIZE 34 -#define TRANZPORT_USB_TIMEOUT 10 -#define TRANZPORT_DEBUG 0 - -static int debug = TRANZPORT_DEBUG; - -/* Use our own dbg macro */ -#define dbg_info(dev, format, arg...) do \ - { if (debug) dev_info(dev , format , ## arg); } while (0) - -/* Module parameters */ - -module_param(debug, int, S_IRUGO | S_IWUSR); -MODULE_PARM_DESC(debug, "Debug enabled or not"); - -/* - * All interrupt in transfers are collected in a ring buffer to - * avoid racing conditions and get better performance of the driver. - */ - -static int ring_buffer_size = RING_BUFFER_SIZE; - -module_param(ring_buffer_size, int, S_IRUGO); -MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports"); - -/* - * The write_buffer can one day contain more than one interrupt out transfer. - */ -static int write_buffer_size = WRITE_BUFFER_SIZE; -module_param(write_buffer_size, int, S_IRUGO); -MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); - -/* - * Increase the interval for debugging purposes. - * or set to 1 to use the standard interval from the endpoint descriptors. - */ - -static int min_interrupt_in_interval = TRANZPORT_USB_TIMEOUT; -module_param(min_interrupt_in_interval, int, 0); -MODULE_PARM_DESC(min_interrupt_in_interval, - "Minimum interrupt in interval in ms"); - -static int min_interrupt_out_interval = TRANZPORT_USB_TIMEOUT; -module_param(min_interrupt_out_interval, int, 0); -MODULE_PARM_DESC(min_interrupt_out_interval, - "Minimum interrupt out interval in ms"); - -struct tranzport_cmd { - unsigned char cmd[8]; -}; - -/* Structure to hold all of our device specific stuff */ - -struct usb_tranzport { - struct mutex mtx; /* locks this structure */ - struct usb_interface *intf; /* save off the usb interface pointer */ - int open_count; /* number of times this port opened */ - struct tranzport_cmd (*ring_buffer)[RING_BUFFER_SIZE]; - unsigned int ring_head; - unsigned int ring_tail; - wait_queue_head_t read_wait; - wait_queue_head_t write_wait; - unsigned char *interrupt_in_buffer; - struct usb_endpoint_descriptor *interrupt_in_endpoint; - struct urb *interrupt_in_urb; - int interrupt_in_interval; - size_t interrupt_in_endpoint_size; - 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; - size_t interrupt_out_endpoint_size; - int interrupt_out_busy; - - /* Sysfs support */ - - unsigned char enable; /* 0 if disabled 1 if enabled */ - unsigned char offline; /* if the device is out of range or asleep */ - unsigned char compress_wheel; /* flag to compress wheel events */ -}; - -/* prevent races between open() and disconnect() */ -static DEFINE_MUTEX(disconnect_mutex); - -static struct usb_driver usb_tranzport_driver; - -/** - * usb_tranzport_abort_transfers - * aborts transfers and frees associated data structures - */ -static void usb_tranzport_abort_transfers(struct usb_tranzport *dev) -{ - /* shutdown transfer */ - if (dev->interrupt_in_running) { - dev->interrupt_in_running = 0; - if (dev->intf) - usb_kill_urb(dev->interrupt_in_urb); - } - if (dev->interrupt_out_busy) - if (dev->intf) - usb_kill_urb(dev->interrupt_out_urb); -} - -#define show_int(value) \ - static ssize_t value##_show(struct device *dev, \ - struct device_attribute *attr, char *buf) \ - { \ - struct usb_interface *intf = to_usb_interface(dev); \ - struct usb_tranzport *t = usb_get_intfdata(intf); \ - return sprintf(buf, "%d\n", t->value); \ - } \ - static DEVICE_ATTR_RO(value) - -#define show_set_int(value) \ - static ssize_t value##_show(struct device *dev, \ - struct device_attribute *attr, char *buf) \ - { \ - struct usb_interface *intf = to_usb_interface(dev); \ - struct usb_tranzport *t = usb_get_intfdata(intf); \ - return sprintf(buf, "%d\n", t->value); \ - } \ - static ssize_t value##_store(struct device *dev, \ - struct device_attribute *attr, \ - const char *buf, size_t count) \ - { \ - struct usb_interface *intf = to_usb_interface(dev); \ - struct usb_tranzport *t = usb_get_intfdata(intf); \ - unsigned long temp; \ - if (kstrtoul(buf, 10, &temp)) \ - return -EINVAL; \ - t->value = temp; \ - return count; \ - } \ - static DEVICE_ATTR_RW(value) - -show_int(enable); -show_int(offline); -show_set_int(compress_wheel); - -/** - * usb_tranzport_delete - */ -static void usb_tranzport_delete(struct usb_tranzport *dev) -{ - usb_tranzport_abort_transfers(dev); - if (dev->intf != NULL) { - device_remove_file(&dev->intf->dev, &dev_attr_enable); - device_remove_file(&dev->intf->dev, &dev_attr_offline); - device_remove_file(&dev->intf->dev, &dev_attr_compress_wheel); - } - - /* free data structures */ - usb_free_urb(dev->interrupt_in_urb); - usb_free_urb(dev->interrupt_out_urb); - kfree(dev->ring_buffer); - kfree(dev->interrupt_in_buffer); - kfree(dev->interrupt_out_buffer); - kfree(dev); -} - -/** - * usb_tranzport_interrupt_in_callback - */ - -static void usb_tranzport_interrupt_in_callback(struct urb *urb) -{ - struct usb_tranzport *dev = urb->context; - unsigned int next_ring_head; - int retval = -1; - - if (urb->status) { - if (urb->status == -ENOENT || - urb->status == -ECONNRESET || - urb->status == -ESHUTDOWN) { - goto exit; - } else { - dbg_info(&dev->intf->dev, - "%s: nonzero status received: %d\n", - __func__, urb->status); - goto resubmit; /* maybe we can recover */ - } - } - - if (urb->actual_length != 8) { - dev_warn(&dev->intf->dev, - "Urb length was %d bytes!! Do something intelligent\n", - urb->actual_length); - } else { - dbg_info(&dev->intf->dev, - "%s: received: %02x%02x%02x%02x%02x%02x%02x%02x\n", - __func__, dev->interrupt_in_buffer[0], - dev->interrupt_in_buffer[1], - dev->interrupt_in_buffer[2], - dev->interrupt_in_buffer[3], - dev->interrupt_in_buffer[4], - dev->interrupt_in_buffer[5], - dev->interrupt_in_buffer[6], - dev->interrupt_in_buffer[7]); -#if SUPPRESS_EXTRA_OFFLINE_EVENTS - if (dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff) - goto resubmit; - if (dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) { - dev->offline = 2; - goto resubmit; - } - - /* Always pass one offline event up the stack */ - if (dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff) - dev->offline = 0; - if (dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff) - dev->offline = 1; - -#endif /* SUPPRESS_EXTRA_OFFLINE_EVENTS */ - dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n", - __func__, dev->ring_head, dev->ring_tail); - - next_ring_head = (dev->ring_head + 1) % ring_buffer_size; - - if (next_ring_head != dev->ring_tail) { - memcpy(&((*dev->ring_buffer)[dev->ring_head]), - dev->interrupt_in_buffer, urb->actual_length); - dev->ring_head = next_ring_head; - retval = 0; - memset(dev->interrupt_in_buffer, 0, urb->actual_length); - } else { - dev_warn(&dev->intf->dev, - "Ring buffer overflow, %d bytes dropped\n", - urb->actual_length); - memset(dev->interrupt_in_buffer, 0, urb->actual_length); - } - } - -resubmit: -/* resubmit if we're still running */ - if (dev->interrupt_in_running && dev->intf) { - retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); - if (retval) - dev_err(&dev->intf->dev, - "usb_submit_urb failed (%d)\n", retval); - } - -exit: - dev->interrupt_in_done = 1; - wake_up_interruptible(&dev->read_wait); -} - -/** - * usb_tranzport_interrupt_out_callback - */ -static void usb_tranzport_interrupt_out_callback(struct urb *urb) -{ - struct usb_tranzport *dev = urb->context; - /* sync/async unlink faults aren't errors */ - if (urb->status && !(urb->status == -ENOENT || - urb->status == -ECONNRESET || - urb->status == -ESHUTDOWN)) - dbg_info(&dev->intf->dev, - "%s - nonzero write interrupt status received: %d\n", - __func__, urb->status); - - dev->interrupt_out_busy = 0; - wake_up_interruptible(&dev->write_wait); -} -/** - * usb_tranzport_open - */ -static int usb_tranzport_open(struct inode *inode, struct file *file) -{ - struct usb_tranzport *dev; - int subminor; - int retval = 0; - struct usb_interface *interface; - - nonseekable_open(inode, file); - subminor = iminor(inode); - - mutex_lock(&disconnect_mutex); - - interface = usb_find_interface(&usb_tranzport_driver, subminor); - - if (!interface) { - pr_err("%s - error, can't find device for minor %d\n", - __func__, subminor); - retval = -ENODEV; - goto unlock_disconnect_exit; - } - - dev = usb_get_intfdata(interface); - - if (!dev) { - retval = -ENODEV; - goto unlock_disconnect_exit; - } - - /* lock this device */ - if (mutex_lock_interruptible(&dev->mtx)) { - retval = -ERESTARTSYS; - goto unlock_disconnect_exit; - } - - /* allow opening only once */ - if (dev->open_count) { - retval = -EBUSY; - goto unlock_exit; - } - dev->open_count = 1; - - /* initialize in direction */ - dev->ring_head = 0; - dev->ring_tail = 0; - usb_fill_int_urb(dev->interrupt_in_urb, - interface_to_usbdev(interface), - usb_rcvintpipe(interface_to_usbdev(interface), - dev->interrupt_in_endpoint-> - bEndpointAddress), - dev->interrupt_in_buffer, - dev->interrupt_in_endpoint_size, - usb_tranzport_interrupt_in_callback, dev, - dev->interrupt_in_interval); - - dev->interrupt_in_running = 1; - dev->interrupt_in_done = 0; - dev->enable = 1; - dev->offline = 0; - dev->compress_wheel = 1; - - retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); - if (retval) { - dev_err(&interface->dev, - "Couldn't submit interrupt_in_urb %d\n", retval); - dev->interrupt_in_running = 0; - dev->open_count = 0; - goto unlock_exit; - } - - /* save device in the file's private structure */ - file->private_data = dev; - -unlock_exit: - mutex_unlock(&dev->mtx); - -unlock_disconnect_exit: - mutex_unlock(&disconnect_mutex); - - return retval; -} - -/** - * usb_tranzport_release - */ -static int usb_tranzport_release(struct inode *inode, struct file *file) -{ - struct usb_tranzport *dev; - int retval = 0; - - dev = file->private_data; - - if (dev == NULL) { - retval = -ENODEV; - goto exit; - } - - if (mutex_lock_interruptible(&dev->mtx)) { - retval = -ERESTARTSYS; - goto exit; - } - - if (dev->open_count != 1) { - retval = -ENODEV; - goto unlock_exit; - } - - if (dev->intf == NULL) { - /* the device was unplugged before the file was released */ - mutex_unlock(&dev->mtx); - /* unlock here as usb_tranzport_delete frees dev */ - usb_tranzport_delete(dev); - retval = -ENODEV; - 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); - usb_tranzport_abort_transfers(dev); - dev->open_count = 0; - -unlock_exit: - mutex_unlock(&dev->mtx); - -exit: - return retval; -} - -/** - * usb_tranzport_poll - */ -static unsigned int usb_tranzport_poll(struct file *file, poll_table *wait) -{ - struct usb_tranzport *dev; - unsigned int mask = 0; - - dev = file->private_data; - poll_wait(file, &dev->read_wait, wait); - poll_wait(file, &dev->write_wait, wait); - if (dev->ring_head != dev->ring_tail) - mask |= POLLIN | POLLRDNORM; - if (!dev->interrupt_out_busy) - mask |= POLLOUT | POLLWRNORM; - return mask; -} -/** - * usb_tranzport_read - */ - -static ssize_t usb_tranzport_read(struct file *file, char __user *buffer, - size_t count, loff_t *ppos) -{ - struct usb_tranzport *dev; - int retval = 0; -#if BUFFERED_READS - int c = 0; -#endif -#if COMPRESS_WHEEL_EVENTS - signed char oldwheel; - signed char newwheel; - int cancompress = 1; - int next_tail; -#endif - - /* do I have such a thing as a null event? */ - - dev = file->private_data; - - /* verify that we actually have some data to read */ - if (count == 0) - goto exit; - - /* lock this object */ - if (mutex_lock_interruptible(&dev->mtx)) { - retval = -ERESTARTSYS; - goto exit; - } - - /* verify that the device wasn't unplugged */ - if (dev->intf == NULL) { - retval = -ENODEV; - pr_err("%s: No device or device unplugged %d\n", - __func__, retval); - goto unlock_exit; - } - - while (dev->ring_head == dev->ring_tail) { - - if (file->f_flags & O_NONBLOCK) { - retval = -EAGAIN; - goto unlock_exit; - } - /* tiny race - FIXME: make atomic? */ - /* atomic_cmp_exchange(&dev->interrupt_in_done,0,0); */ - dev->interrupt_in_done = 0; - retval = wait_event_interruptible(dev->read_wait, - dev->interrupt_in_done); - if (retval < 0) - goto unlock_exit; - } - - dbg_info(&dev->intf->dev, - "%s: copying to userspace: %02x%02x%02x%02x%02x%02x%02x%02x\n", - __func__, - (*dev->ring_buffer)[dev->ring_tail].cmd[0], - (*dev->ring_buffer)[dev->ring_tail].cmd[1], - (*dev->ring_buffer)[dev->ring_tail].cmd[2], - (*dev->ring_buffer)[dev->ring_tail].cmd[3], - (*dev->ring_buffer)[dev->ring_tail].cmd[4], - (*dev->ring_buffer)[dev->ring_tail].cmd[5], - (*dev->ring_buffer)[dev->ring_tail].cmd[6], - (*dev->ring_buffer)[dev->ring_tail].cmd[7]); - -#if BUFFERED_READS - c = 0; - while ((c < count) && (dev->ring_tail != dev->ring_head)) { - -#if COMPRESS_WHEEL_EVENTS - next_tail = (dev->ring_tail+1) % ring_buffer_size; - if (dev->compress_wheel) - cancompress = 1; - while (dev->ring_head != next_tail && cancompress == 1) { - newwheel = (*dev->ring_buffer)[next_tail].cmd[6]; - oldwheel = (*dev->ring_buffer)[dev->ring_tail].cmd[6]; - /* if both are wheel events, and - * no buttons have changes (FIXME, do I have to check?), - * and we are the same sign, we can compress +- 7F - */ - dbg_info(&dev->intf->dev, - "%s: trying to compress: %02x%02x%02x%02x%02x%02x%02x%02x\n", - __func__, - (*dev->ring_buffer)[dev->ring_tail].cmd[0], - (*dev->ring_buffer)[dev->ring_tail].cmd[1], - (*dev->ring_buffer)[dev->ring_tail].cmd[2], - (*dev->ring_buffer)[dev->ring_tail].cmd[3], - (*dev->ring_buffer)[dev->ring_tail].cmd[4], - (*dev->ring_buffer)[dev->ring_tail].cmd[5], - (*dev->ring_buffer)[dev->ring_tail].cmd[6], - (*dev->ring_buffer)[dev->ring_tail].cmd[7]); - - if (((*dev->ring_buffer)[dev->ring_tail].cmd[6] != 0 && - (*dev->ring_buffer)[next_tail].cmd[6] != 0) && - ((newwheel > 0 && oldwheel > 0) || - (newwheel < 0 && oldwheel < 0)) && - ((*dev->ring_buffer)[dev->ring_tail].cmd[2] == - (*dev->ring_buffer)[next_tail].cmd[2]) && - ((*dev->ring_buffer)[dev->ring_tail].cmd[3] == - (*dev->ring_buffer)[next_tail].cmd[3]) && - ((*dev->ring_buffer)[dev->ring_tail].cmd[4] == - (*dev->ring_buffer)[next_tail].cmd[4]) && - ((*dev->ring_buffer)[dev->ring_tail].cmd[5] == - (*dev->ring_buffer)[next_tail].cmd[5])) { - dbg_info(&dev->intf->dev, - "%s: should compress: " - "%02x%02x%02x%02x%02x%02x%02x%02x\n", - __func__, - (*dev->ring_buffer)[dev->ring_tail]. - cmd[0], - (*dev->ring_buffer)[dev->ring_tail]. - cmd[1], - (*dev->ring_buffer)[dev->ring_tail]. - cmd[2], - (*dev->ring_buffer)[dev->ring_tail]. - cmd[3], - (*dev->ring_buffer)[dev->ring_tail]. - cmd[4], - (*dev->ring_buffer)[dev->ring_tail]. - cmd[5], - (*dev->ring_buffer)[dev->ring_tail]. - cmd[6], - (*dev->ring_buffer)[dev->ring_tail]. - cmd[7]); - newwheel += oldwheel; - if (oldwheel > 0 && !(newwheel > 0)) { - newwheel = 0x7f; - cancompress = 0; - } - if (oldwheel < 0 && !(newwheel < 0)) { - newwheel = 0x80; - cancompress = 0; - } - - (*dev->ring_buffer)[next_tail].cmd[6] = - newwheel; - dev->ring_tail = next_tail; - next_tail = - (dev->ring_tail + 1) % ring_buffer_size; - } else { - cancompress = 0; - } - } -#endif /* COMPRESS_WHEEL_EVENTS */ - if (copy_to_user( - &buffer[c], - &(*dev->ring_buffer)[dev->ring_tail], 8)) { - retval = -EFAULT; - goto unlock_exit; - } - dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size; - c += 8; - dbg_info(&dev->intf->dev, - "%s: head, tail are %x, %x\n", - __func__, dev->ring_head, dev->ring_tail); - } - retval = c; - -#else -/* if (copy_to_user(buffer, &(*dev->ring_buffer)[dev->ring_tail], 8)) { */ - retval = -EFAULT; - goto unlock_exit; -} - -dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size; -dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n", - __func__, dev->ring_head, dev->ring_tail); - -retval = 8; -#endif /* BUFFERED_READS */ - -unlock_exit: -/* unlock the device */ -mutex_unlock(&dev->mtx); - -exit: -return retval; -} - -/** - * usb_tranzport_write - */ -static ssize_t usb_tranzport_write(struct file *file, - const char __user *buffer, size_t count, - loff_t *ppos) -{ - struct usb_tranzport *dev; - size_t bytes_to_write; - int retval = 0; - - dev = file->private_data; - - /* verify that we actually have some data to write */ - if (count == 0) - goto exit; - - /* lock this object */ - if (mutex_lock_interruptible(&dev->mtx)) { - retval = -ERESTARTSYS; - goto exit; - } - /* verify that the device wasn't unplugged */ - if (dev->intf == NULL) { - retval = -ENODEV; - pr_err("%s: No device or device unplugged %d\n", - __func__, retval); - goto unlock_exit; - } - - /* wait until previous transfer is finished */ - if (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 < 0) - goto unlock_exit; - } - - /* write the data into interrupt_out_buffer from userspace */ - bytes_to_write = min(count, - write_buffer_size * - dev->interrupt_out_endpoint_size); - if (bytes_to_write < count) - dev_warn(&dev->intf->dev, - "Write buffer overflow, %zd bytes dropped\n", - count - bytes_to_write); - - dbg_info(&dev->intf->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; - } - - if (dev->interrupt_out_endpoint == NULL) { - dev_err(&dev->intf->dev, "Endpoint should not be null!\n"); - goto unlock_exit; - } - - /* send off the urb */ - usb_fill_int_urb(dev->interrupt_out_urb, - interface_to_usbdev(dev->intf), - usb_sndintpipe(interface_to_usbdev(dev->intf), - dev->interrupt_out_endpoint-> - bEndpointAddress), - dev->interrupt_out_buffer, bytes_to_write, - usb_tranzport_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->intf->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->mtx); - -exit: - return retval; -} - -/* file operations needed when we register this driver */ -static const struct file_operations usb_tranzport_fops = { - .owner = THIS_MODULE, - .read = usb_tranzport_read, - .write = usb_tranzport_write, - .open = usb_tranzport_open, - .release = usb_tranzport_release, - .poll = usb_tranzport_poll, - .llseek = no_llseek, -}; - -/* - * 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 usb_tranzport_class = { - .name = "tranzport%d", - .fops = &usb_tranzport_fops, - .minor_base = USB_TRANZPORT_MINOR_BASE, -}; - -/** - * usb_tranzport_probe - * - * Called by the usb core when a new device is connected that it thinks - * this driver might be interested in. - */ -static int usb_tranzport_probe(struct usb_interface *intf, - const struct usb_device_id *id) { - struct usb_device *udev = interface_to_usbdev(intf); - struct usb_tranzport *dev = NULL; - struct usb_host_interface *iface_desc; - struct usb_endpoint_descriptor *endpoint; - int i; - int true_size; - int retval = -ENOMEM; - - /* allocate memory for our device state and initialize it */ - - dev = kzalloc(sizeof(*dev), GFP_KERNEL); - if (dev == NULL) - goto exit; - - mutex_init(&dev->mtx); - dev->intf = intf; - init_waitqueue_head(&dev->read_wait); - init_waitqueue_head(&dev->write_wait); - - iface_desc = intf->cur_altsetting; - - /* 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(&intf->dev, "Interrupt in endpoint not found\n"); - goto error; - } - if (dev->interrupt_out_endpoint == NULL) - dev_warn(&intf->dev, - "Interrupt out endpoint not found (using control endpoint instead)\n"); - - dev->interrupt_in_endpoint_size = - le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); - - if (dev->interrupt_in_endpoint_size != 8) - dev_warn(&intf->dev, "Interrupt in endpoint size is not 8!\n"); - - if (ring_buffer_size == 0) - ring_buffer_size = RING_BUFFER_SIZE; - true_size = min(ring_buffer_size, RING_BUFFER_SIZE); - - /* - * FIXME - there are more usb_alloc routines for dma correctness. - * Needed? - */ - - dev->ring_buffer = - kmalloc((true_size * sizeof(struct tranzport_cmd)) + 8, GFP_KERNEL); - if (!dev->ring_buffer) - goto error; - - dev->interrupt_in_buffer = - kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); - if (!dev->interrupt_in_buffer) - goto error; - - dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); - if (!dev->interrupt_in_urb) { - dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n"); - goto error; - } - dev->interrupt_out_endpoint_size = - dev->interrupt_out_endpoint ? - le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) : - udev->descriptor.bMaxPacketSize0; - - if (dev->interrupt_out_endpoint_size != 8) - dev_warn(&intf->dev, - "Interrupt out endpoint size is not 8!)\n"); - - dev->interrupt_out_buffer = - kmalloc_array(write_buffer_size, - dev->interrupt_out_endpoint_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) { - dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n"); - goto error; - } - dev->interrupt_in_interval = - min_interrupt_in_interval > - dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval - : dev->interrupt_in_endpoint->bInterval; - - if (dev->interrupt_out_endpoint) { - dev->interrupt_out_interval = - min_interrupt_out_interval > - dev->interrupt_out_endpoint->bInterval ? - min_interrupt_out_interval : - dev->interrupt_out_endpoint->bInterval; - } - - /* we can register the device now, as it is ready */ - usb_set_intfdata(intf, dev); - - retval = usb_register_dev(intf, &usb_tranzport_class); - if (retval) { - /* something prevented us from registering this driver */ - dev_err(&intf->dev, - "Not able to get a minor for this device.\n"); - usb_set_intfdata(intf, NULL); - goto error; - } - - retval = device_create_file(&intf->dev, &dev_attr_compress_wheel); - if (retval) - goto error; - retval = device_create_file(&intf->dev, &dev_attr_enable); - if (retval) - goto error; - retval = device_create_file(&intf->dev, &dev_attr_offline); - if (retval) - goto error; - - /* let the user know what node this device is now attached to */ - dev_info(&intf->dev, - "Tranzport Device #%d now attached to major %d minor %d\n", - (intf->minor - USB_TRANZPORT_MINOR_BASE), USB_MAJOR, - intf->minor); - -exit: - return retval; - -error: - usb_tranzport_delete(dev); - return retval; -} - -/** - * usb_tranzport_disconnect - * - * Called by the usb core when the device is removed from the system. - */ -static void usb_tranzport_disconnect(struct usb_interface *intf) -{ - struct usb_tranzport *dev; - int minor; - - mutex_lock(&disconnect_mutex); - dev = usb_get_intfdata(intf); - usb_set_intfdata(intf, NULL); - mutex_lock(&dev->mtx); - minor = intf->minor; - /* give back our minor */ - usb_deregister_dev(intf, &usb_tranzport_class); - - /* if the device is not opened, then we clean up right now */ - if (!dev->open_count) { - mutex_unlock(&dev->mtx); - usb_tranzport_delete(dev); - } else { - dev->intf = NULL; - mutex_unlock(&dev->mtx); - } - - mutex_unlock(&disconnect_mutex); - - dev_info(&intf->dev, "Tranzport Surface #%d now disconnected\n", - (minor - USB_TRANZPORT_MINOR_BASE)); -} - -/* usb specific object needed to register this driver with the usb subsystem */ -static struct usb_driver usb_tranzport_driver = { - .name = "tranzport", - .probe = usb_tranzport_probe, - .disconnect = usb_tranzport_disconnect, - .id_table = usb_tranzport_table, -}; - -module_usb_driver(usb_tranzport_driver); |