2 * Native support for the I/O-Warrior USB devices
4 * Copyright (c) 2003-2005, 2020 Code Mercenaries GmbH
5 * written by Christian Lucht <lucht@codemercs.com> and
6 * Christoph Jung <jung@codemercs.com>
10 * usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com>
11 * brlvger.c by Stephane Dalton <sdalton@videotron.ca>
12 * and St�hane Doyon <s.doyon@videotron.ca>
14 * Released under the GPLv2.
17 #include <linux/module.h>
18 #include <linux/usb.h>
19 #include <linux/slab.h>
20 #include <linux/sched.h>
21 #include <linux/mutex.h>
22 #include <linux/poll.h>
23 #include <linux/usb/iowarrior.h>
25 #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>"
26 #define DRIVER_DESC "USB IO-Warrior driver"
28 #define USB_VENDOR_ID_CODEMERCS 1984
29 /* low speed iowarrior */
30 #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500
31 #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501
32 #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511
33 #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512
34 /* full speed iowarrior */
35 #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503
36 /* fuller speed iowarrior */
37 #define USB_DEVICE_ID_CODEMERCS_IOW28 0x1504
38 #define USB_DEVICE_ID_CODEMERCS_IOW28L 0x1505
39 #define USB_DEVICE_ID_CODEMERCS_IOW100 0x1506
42 #define USB_DEVICE_ID_CODEMERCS_IOW24SAG 0x158a
43 #define USB_DEVICE_ID_CODEMERCS_IOW56AM 0x158b
45 /* Get a minor range for your devices from the usb maintainer */
46 #ifdef CONFIG_USB_DYNAMIC_MINORS
47 #define IOWARRIOR_MINOR_BASE 0
49 #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet
52 /* interrupt input queue size */
53 #define MAX_INTERRUPT_BUFFER 16
55 maximum number of urbs that are submitted for writes at the same time,
56 this applies to the IOWarrior56 only!
57 IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls.
59 #define MAX_WRITES_IN_FLIGHT 4
61 MODULE_AUTHOR(DRIVER_AUTHOR);
62 MODULE_DESCRIPTION(DRIVER_DESC);
63 MODULE_LICENSE("GPL");
65 /* Module parameters */
66 static DEFINE_MUTEX(iowarrior_mutex);
68 static struct usb_driver iowarrior_driver;
69 static DEFINE_MUTEX(iowarrior_open_disc_lock);
75 /* Structure to hold all of our device specific stuff */
77 struct mutex mutex; /* locks this structure */
78 struct usb_device *udev; /* save off the usb device pointer */
79 struct usb_interface *interface; /* the interface for this device */
80 unsigned char minor; /* the starting minor number for this device */
81 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */
82 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */
83 struct urb *int_in_urb; /* the urb for reading data */
84 unsigned char *int_in_buffer; /* buffer for data to be read */
85 unsigned char serial_number; /* to detect lost packages */
86 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */
87 wait_queue_head_t read_wait;
88 wait_queue_head_t write_wait; /* wait-queue for writing to the device */
89 atomic_t write_busy; /* number of write-urbs submitted */
92 spinlock_t intr_idx_lock; /* protects intr_idx */
93 atomic_t overflow_flag; /* signals an index 'rollover' */
94 int present; /* this is 1 as long as the device is connected */
95 int opened; /* this is 1 if the device is currently open */
96 char chip_serial[9]; /* the serial number string of the chip connected */
97 int report_size; /* number of bytes in a report */
99 struct usb_anchor submitted;
107 * USB spec identifies 5 second timeouts.
109 #define GET_TIMEOUT 5
110 #define USB_REQ_GET_REPORT 0x01
112 static int usb_get_report(struct usb_device *dev,
113 struct usb_host_interface *inter, unsigned char type,
114 unsigned char id, void *buf, int size)
116 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
118 USB_DIR_IN | USB_TYPE_CLASS |
119 USB_RECIP_INTERFACE, (type << 8) + id,
120 inter->desc.bInterfaceNumber, buf, size,
125 #define USB_REQ_SET_REPORT 0x09
127 static int usb_set_report(struct usb_interface *intf, unsigned char type,
128 unsigned char id, void *buf, int size)
130 return usb_control_msg(interface_to_usbdev(intf),
131 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
133 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
135 intf->cur_altsetting->desc.bInterfaceNumber, buf,
139 /*---------------------*/
140 /* driver registration */
141 /*---------------------*/
142 /* table of devices that work with this driver */
143 static const struct usb_device_id iowarrior_ids[] = {
144 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
145 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
146 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
147 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
148 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
149 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24SAG)},
150 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56AM)},
151 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW28)},
152 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW28L)},
153 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW100)},
154 {} /* Terminating entry */
156 MODULE_DEVICE_TABLE(usb, iowarrior_ids);
159 * USB callback handler for reading data
161 static void iowarrior_callback(struct urb *urb)
163 struct iowarrior *dev = urb->context;
168 int status = urb->status;
183 spin_lock(&dev->intr_idx_lock);
184 intr_idx = atomic_read(&dev->intr_idx);
185 /* aux_idx become previous intr_idx */
186 aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1);
187 read_idx = atomic_read(&dev->read_idx);
189 /* queue is not empty and it's interface 0 */
190 if ((intr_idx != read_idx)
191 && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) {
192 /* + 1 for serial number */
193 offset = aux_idx * (dev->report_size + 1);
195 (dev->read_queue + offset, urb->transfer_buffer,
197 /* equal values on interface 0 will be ignored */
198 spin_unlock(&dev->intr_idx_lock);
203 /* aux_idx become next intr_idx */
204 aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1);
205 if (read_idx == aux_idx) {
206 /* queue full, dropping oldest input */
207 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx;
208 atomic_set(&dev->read_idx, read_idx);
209 atomic_set(&dev->overflow_flag, 1);
212 /* +1 for serial number */
213 offset = intr_idx * (dev->report_size + 1);
214 memcpy(dev->read_queue + offset, urb->transfer_buffer,
216 *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++;
218 atomic_set(&dev->intr_idx, aux_idx);
219 spin_unlock(&dev->intr_idx_lock);
220 /* tell the blocking read about the new data */
221 wake_up_interruptible(&dev->read_wait);
224 retval = usb_submit_urb(urb, GFP_ATOMIC);
226 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n",
232 * USB Callback handler for write-ops
234 static void iowarrior_write_callback(struct urb *urb)
236 struct iowarrior *dev;
237 int status = urb->status;
240 /* sync/async unlink faults aren't errors */
242 !(status == -ENOENT ||
243 status == -ECONNRESET || status == -ESHUTDOWN)) {
244 dev_dbg(&dev->interface->dev,
245 "nonzero write bulk status received: %d\n", status);
247 /* free up our allocated buffer */
248 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
249 urb->transfer_buffer, urb->transfer_dma);
250 /* tell a waiting writer the interrupt-out-pipe is available again */
251 atomic_dec(&dev->write_busy);
252 wake_up_interruptible(&dev->write_wait);
258 static inline void iowarrior_delete(struct iowarrior *dev)
260 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
261 kfree(dev->int_in_buffer);
262 usb_free_urb(dev->int_in_urb);
263 kfree(dev->read_queue);
264 usb_put_intf(dev->interface);
268 /*---------------------*/
269 /* fops implementation */
270 /*---------------------*/
272 static int read_index(struct iowarrior *dev)
274 int intr_idx, read_idx;
276 read_idx = atomic_read(&dev->read_idx);
277 intr_idx = atomic_read(&dev->intr_idx);
279 return (read_idx == intr_idx ? -1 : read_idx);
285 static ssize_t iowarrior_read(struct file *file, char __user *buffer,
286 size_t count, loff_t *ppos)
288 struct iowarrior *dev;
292 dev = file->private_data;
294 /* verify that the device wasn't unplugged */
295 if (!dev || !dev->present)
298 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
301 /* read count must be packet size (+ time stamp) */
302 if ((count != dev->report_size)
303 && (count != (dev->report_size + 1)))
306 /* repeat until no buffer overrun in callback handler occur */
308 atomic_set(&dev->overflow_flag, 0);
309 if ((read_idx = read_index(dev)) == -1) {
311 if (file->f_flags & O_NONBLOCK)
314 //next line will return when there is either new data, or the device is unplugged
315 int r = wait_event_interruptible(dev->read_wait,
322 //we were interrupted by a signal
326 //The device was unplugged
329 if (read_idx == -1) {
330 // Can this happen ???
336 offset = read_idx * (dev->report_size + 1);
337 if (copy_to_user(buffer, dev->read_queue + offset, count)) {
340 } while (atomic_read(&dev->overflow_flag));
342 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
343 atomic_set(&dev->read_idx, read_idx);
350 static ssize_t iowarrior_write(struct file *file,
351 const char __user *user_buffer,
352 size_t count, loff_t *ppos)
354 struct iowarrior *dev;
356 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */
357 struct urb *int_out_urb = NULL;
359 dev = file->private_data;
361 mutex_lock(&dev->mutex);
362 /* verify that the device wasn't unplugged */
367 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
369 /* if count is 0 we're already done */
374 /* We only accept full reports */
375 if (count != dev->report_size) {
379 switch (dev->product_id) {
380 case USB_DEVICE_ID_CODEMERCS_IOW24:
381 case USB_DEVICE_ID_CODEMERCS_IOW24SAG:
382 case USB_DEVICE_ID_CODEMERCS_IOWPV1:
383 case USB_DEVICE_ID_CODEMERCS_IOWPV2:
384 case USB_DEVICE_ID_CODEMERCS_IOW40:
385 /* IOW24 and IOW40 use a synchronous call */
386 buf = memdup_user(user_buffer, count);
388 retval = PTR_ERR(buf);
391 retval = usb_set_report(dev->interface, 2, 0, buf, count);
395 case USB_DEVICE_ID_CODEMERCS_IOW56:
396 case USB_DEVICE_ID_CODEMERCS_IOW56AM:
397 case USB_DEVICE_ID_CODEMERCS_IOW28:
398 case USB_DEVICE_ID_CODEMERCS_IOW28L:
399 case USB_DEVICE_ID_CODEMERCS_IOW100:
400 /* The IOW56 uses asynchronous IO and more urbs */
401 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
402 /* Wait until we are below the limit for submitted urbs */
403 if (file->f_flags & O_NONBLOCK) {
407 retval = wait_event_interruptible(dev->write_wait,
408 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
410 /* we were interrupted by a signal */
415 /* The device was unplugged */
420 /* We were closed while waiting for an URB */
426 atomic_inc(&dev->write_busy);
427 int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
432 buf = usb_alloc_coherent(dev->udev, dev->report_size,
433 GFP_KERNEL, &int_out_urb->transfer_dma);
436 dev_dbg(&dev->interface->dev,
437 "Unable to allocate buffer\n");
438 goto error_no_buffer;
440 usb_fill_int_urb(int_out_urb, dev->udev,
441 usb_sndintpipe(dev->udev,
442 dev->int_out_endpoint->bEndpointAddress),
443 buf, dev->report_size,
444 iowarrior_write_callback, dev,
445 dev->int_out_endpoint->bInterval);
446 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
447 if (copy_from_user(buf, user_buffer, count)) {
451 usb_anchor_urb(int_out_urb, &dev->submitted);
452 retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
454 dev_dbg(&dev->interface->dev,
455 "submit error %d for urb nr.%d\n",
456 retval, atomic_read(&dev->write_busy));
457 usb_unanchor_urb(int_out_urb);
462 usb_free_urb(int_out_urb);
466 /* what do we have here ? An unsupported Product-ID ? */
467 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n",
468 __func__, dev->product_id);
474 usb_free_coherent(dev->udev, dev->report_size, buf,
475 int_out_urb->transfer_dma);
477 usb_free_urb(int_out_urb);
479 atomic_dec(&dev->write_busy);
480 wake_up_interruptible(&dev->write_wait);
482 mutex_unlock(&dev->mutex);
489 static long iowarrior_ioctl(struct file *file, unsigned int cmd,
492 struct iowarrior *dev = NULL;
494 __u8 __user *user_buffer;
496 int io_res; /* checks for bytes read/written and copy_to/from_user results */
498 dev = file->private_data;
502 buffer = kzalloc(dev->report_size, GFP_KERNEL);
506 /* lock this object */
507 mutex_lock(&iowarrior_mutex);
508 mutex_lock(&dev->mutex);
510 /* verify that the device wasn't unplugged */
516 dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n",
517 dev->minor, cmd, arg);
523 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
524 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24SAG ||
525 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
526 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
527 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
528 user_buffer = (__u8 __user *)arg;
529 io_res = copy_from_user(buffer, user_buffer,
534 io_res = usb_set_report(dev->interface, 2, 0,
542 dev_err(&dev->interface->dev,
543 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n",
548 user_buffer = (__u8 __user *)arg;
549 io_res = usb_get_report(dev->udev,
550 dev->interface->cur_altsetting, 1, 0,
551 buffer, dev->report_size);
555 io_res = copy_to_user(user_buffer, buffer, dev->report_size);
562 /* Report available information for the device */
563 struct iowarrior_info info;
564 /* needed for power consumption */
565 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
567 memset(&info, 0, sizeof(info));
568 /* directly from the descriptor */
569 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
570 info.product = dev->product_id;
571 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
573 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
574 info.speed = dev->udev->speed;
575 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
576 info.report_size = dev->report_size;
578 /* serial number string has been read earlier 8 chars or empty string */
579 memcpy(info.serial, dev->chip_serial,
580 sizeof(dev->chip_serial));
581 if (cfg_descriptor == NULL) {
582 info.power = -1; /* no information available */
584 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
585 info.power = cfg_descriptor->bMaxPower * 2;
587 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
588 sizeof(struct iowarrior_info));
594 /* return that we did not understand this ioctl call */
599 /* unlock the device */
600 mutex_unlock(&dev->mutex);
601 mutex_unlock(&iowarrior_mutex);
609 static int iowarrior_open(struct inode *inode, struct file *file)
611 struct iowarrior *dev = NULL;
612 struct usb_interface *interface;
616 mutex_lock(&iowarrior_mutex);
617 subminor = iminor(inode);
619 interface = usb_find_interface(&iowarrior_driver, subminor);
621 mutex_unlock(&iowarrior_mutex);
622 printk(KERN_ERR "%s - error, can't find device for minor %d\n",
627 mutex_lock(&iowarrior_open_disc_lock);
628 dev = usb_get_intfdata(interface);
630 mutex_unlock(&iowarrior_open_disc_lock);
631 mutex_unlock(&iowarrior_mutex);
635 mutex_lock(&dev->mutex);
636 mutex_unlock(&iowarrior_open_disc_lock);
638 /* Only one process can open each device, no sharing. */
644 /* setup interrupt handler for receiving values */
645 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
646 dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
650 /* increment our usage count for the driver */
652 /* save our object in the file's private structure */
653 file->private_data = dev;
657 mutex_unlock(&dev->mutex);
658 mutex_unlock(&iowarrior_mutex);
665 static int iowarrior_release(struct inode *inode, struct file *file)
667 struct iowarrior *dev;
670 dev = file->private_data;
674 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
676 /* lock our device */
677 mutex_lock(&dev->mutex);
679 if (dev->opened <= 0) {
680 retval = -ENODEV; /* close called more than once */
681 mutex_unlock(&dev->mutex);
683 dev->opened = 0; /* we're closing now */
687 The device is still connected so we only shutdown
688 pending read-/write-ops.
690 usb_kill_urb(dev->int_in_urb);
691 wake_up_interruptible(&dev->read_wait);
692 wake_up_interruptible(&dev->write_wait);
693 mutex_unlock(&dev->mutex);
695 /* The device was unplugged, cleanup resources */
696 mutex_unlock(&dev->mutex);
697 iowarrior_delete(dev);
703 static unsigned iowarrior_poll(struct file *file, poll_table * wait)
705 struct iowarrior *dev = file->private_data;
706 unsigned int mask = 0;
709 return POLLERR | POLLHUP;
711 poll_wait(file, &dev->read_wait, wait);
712 poll_wait(file, &dev->write_wait, wait);
715 return POLLERR | POLLHUP;
717 if (read_index(dev) != -1)
718 mask |= POLLIN | POLLRDNORM;
720 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
721 mask |= POLLOUT | POLLWRNORM;
726 * File operations needed when we register this driver.
727 * This assumes that this driver NEEDS file operations,
728 * of course, which means that the driver is expected
729 * to have a node in the /dev directory. If the USB
730 * device were for a network interface then the driver
731 * would use "struct net_driver" instead, and a serial
732 * device would use "struct tty_driver".
734 static const struct file_operations iowarrior_fops = {
735 .owner = THIS_MODULE,
736 .write = iowarrior_write,
737 .read = iowarrior_read,
738 .unlocked_ioctl = iowarrior_ioctl,
739 .open = iowarrior_open,
740 .release = iowarrior_release,
741 .poll = iowarrior_poll,
742 .llseek = noop_llseek,
745 static char *iowarrior_devnode(struct device *dev, umode_t *mode)
747 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
751 * usb class driver info in order to get a minor number from the usb core,
752 * and to have the device registered with devfs and the driver core
754 static struct usb_class_driver iowarrior_class = {
755 .name = "iowarrior%d",
756 .devnode = iowarrior_devnode,
757 .fops = &iowarrior_fops,
758 .minor_base = IOWARRIOR_MINOR_BASE,
761 /*---------------------------------*/
762 /* probe and disconnect functions */
763 /*---------------------------------*/
767 * Called by the usb core when a new device is connected that it thinks
768 * this driver might be interested in.
770 static int iowarrior_probe(struct usb_interface *interface,
771 const struct usb_device_id *id)
773 struct usb_device *udev = interface_to_usbdev(interface);
774 struct iowarrior *dev = NULL;
775 struct usb_host_interface *iface_desc;
776 int retval = -ENOMEM;
779 /* allocate memory for our device state and initialize it */
780 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
784 mutex_init(&dev->mutex);
786 atomic_set(&dev->intr_idx, 0);
787 atomic_set(&dev->read_idx, 0);
788 spin_lock_init(&dev->intr_idx_lock);
789 atomic_set(&dev->overflow_flag, 0);
790 init_waitqueue_head(&dev->read_wait);
791 atomic_set(&dev->write_busy, 0);
792 init_waitqueue_head(&dev->write_wait);
795 dev->interface = usb_get_intf(interface);
797 iface_desc = interface->cur_altsetting;
798 dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
800 init_usb_anchor(&dev->submitted);
802 res = usb_find_last_int_in_endpoint(iface_desc, &dev->int_in_endpoint);
804 dev_err(&interface->dev, "no interrupt-in endpoint found\n");
809 if ((dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) ||
810 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56AM) ||
811 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28) ||
812 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28L) ||
813 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW100)) {
814 res = usb_find_last_int_out_endpoint(iface_desc,
815 &dev->int_out_endpoint);
817 dev_err(&interface->dev, "no interrupt-out endpoint found\n");
823 /* we have to check the report_size often, so remember it in the endianness suitable for our machine */
824 dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
827 * Some devices need the report size to be different than the
830 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
831 switch (dev->product_id) {
832 case USB_DEVICE_ID_CODEMERCS_IOW56:
833 case USB_DEVICE_ID_CODEMERCS_IOW56AM:
834 dev->report_size = 7;
837 case USB_DEVICE_ID_CODEMERCS_IOW28:
838 case USB_DEVICE_ID_CODEMERCS_IOW28L:
839 dev->report_size = 4;
842 case USB_DEVICE_ID_CODEMERCS_IOW100:
843 dev->report_size = 13;
848 /* create the urb and buffer for reading */
849 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
850 if (!dev->int_in_urb)
852 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
853 if (!dev->int_in_buffer)
855 usb_fill_int_urb(dev->int_in_urb, dev->udev,
856 usb_rcvintpipe(dev->udev,
857 dev->int_in_endpoint->bEndpointAddress),
858 dev->int_in_buffer, dev->report_size,
859 iowarrior_callback, dev,
860 dev->int_in_endpoint->bInterval);
861 /* create an internal buffer for interrupt data from the device */
863 kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER),
865 if (!dev->read_queue)
867 /* Get the serial-number of the chip */
868 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
869 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
870 sizeof(dev->chip_serial));
871 if (strlen(dev->chip_serial) != 8)
872 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
874 /* Set the idle timeout to 0, if this is interface 0 */
875 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
876 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
878 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
879 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
881 /* allow device read and ioctl */
884 /* we can register the device now, as it is ready */
885 usb_set_intfdata(interface, dev);
887 retval = usb_register_dev(interface, &iowarrior_class);
889 /* something prevented us from registering this driver */
890 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
891 usb_set_intfdata(interface, NULL);
895 dev->minor = interface->minor;
897 /* let the user know what node this device is now attached to */
898 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
899 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
900 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
904 iowarrior_delete(dev);
909 * iowarrior_disconnect
911 * Called by the usb core when the device is removed from the system.
913 static void iowarrior_disconnect(struct usb_interface *interface)
915 struct iowarrior *dev;
918 dev = usb_get_intfdata(interface);
919 mutex_lock(&iowarrior_open_disc_lock);
920 usb_set_intfdata(interface, NULL);
923 mutex_unlock(&iowarrior_open_disc_lock);
924 /* give back our minor - this will call close() locks need to be dropped at this point*/
926 usb_deregister_dev(interface, &iowarrior_class);
928 mutex_lock(&dev->mutex);
930 /* prevent device read, write and ioctl */
934 /* There is a process that holds a filedescriptor to the device ,
935 so we only shutdown read-/write-ops going on.
936 Deleting the device is postponed until close() was called.
938 usb_kill_urb(dev->int_in_urb);
939 usb_kill_anchored_urbs(&dev->submitted);
940 wake_up_interruptible(&dev->read_wait);
941 wake_up_interruptible(&dev->write_wait);
942 mutex_unlock(&dev->mutex);
944 /* no process is using the device, cleanup now */
945 mutex_unlock(&dev->mutex);
946 iowarrior_delete(dev);
949 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
950 minor - IOWARRIOR_MINOR_BASE);
953 /* usb specific object needed to register this driver with the usb subsystem */
954 static struct usb_driver iowarrior_driver = {
956 .probe = iowarrior_probe,
957 .disconnect = iowarrior_disconnect,
958 .id_table = iowarrior_ids,
961 module_usb_driver(iowarrior_driver);