| /* |
| * 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/init.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 show_##value(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(value, S_IRUGO, show_##value, NULL); |
| |
| #define show_set_int(value) \ |
| static ssize_t show_##value(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 set_##value(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 (strict_strtoul(buf, 10, &temp)) \ |
| return -EINVAL; \ |
| t->value = temp; \ |
| return count; \ |
| } \ |
| static DEVICE_ATTR(value, S_IWUGO | S_IRUGO, show_##value, set_##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) { |
| 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; |
| err("No device or device unplugged %d\n", 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; |
| err("No device or device unplugged %d\n", 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) { |
| err("Endpoint should not be 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; |
| err("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 intialize it */ |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (dev == NULL) { |
| dev_err(&intf->dev, "Out of memory\n"); |
| 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) { |
| dev_err(&intf->dev, |
| "Couldn't allocate ring_buffer size %d\n", true_size); |
| goto error; |
| } |
| dev->interrupt_in_buffer = |
| kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); |
| if (!dev->interrupt_in_buffer) { |
| dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n"); |
| 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(write_buffer_size * dev->interrupt_out_endpoint_size, |
| GFP_KERNEL); |
| if (!dev->interrupt_out_buffer) { |
| dev_err(&intf->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(&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, |
| }; |
| |
| /** |
| * usb_tranzport_init |
| */ |
| static int __init usb_tranzport_init(void) |
| { |
| int retval; |
| |
| /* register this driver with the USB subsystem */ |
| retval = usb_register(&usb_tranzport_driver); |
| if (retval) |
| err("usb_register failed for the " __FILE__ |
| " driver. Error number %d\n", retval); |
| return retval; |
| } |
| /** |
| * usb_tranzport_exit |
| */ |
| |
| static void __exit usb_tranzport_exit(void) |
| { |
| /* deregister this driver with the USB subsystem */ |
| usb_deregister(&usb_tranzport_driver); |
| } |
| |
| module_init(usb_tranzport_init); |
| module_exit(usb_tranzport_exit); |