2 * Generic USB driver for report based interrupt in/out devices
3 * like LD Didactic's USB devices. LD Didactic's USB devices are
4 * HID devices which do not use HID report definitons (they use
5 * raw interrupt in and our reports only for communication).
7 * This driver uses a ring buffer for time critical reading of
8 * interrupt in reports and provides read and write methods for
9 * raw interrupt reports (similar to the Windows HID driver).
10 * Devices based on the book USB COMPLETE by Jan Axelson may need
11 * such a compatibility to the Windows HID driver.
13 * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de>
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
20 * Derived from Lego USB Tower driver
21 * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net>
22 * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
25 #include <linux/kernel.h>
26 #include <linux/errno.h>
27 #include <linux/slab.h>
28 #include <linux/module.h>
29 #include <linux/mutex.h>
31 #include <linux/uaccess.h>
32 #include <linux/input.h>
33 #include <linux/usb.h>
34 #include <linux/poll.h>
36 /* Define these values to match your devices */
37 #define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */
38 #define USB_DEVICE_ID_LD_CASSY 0x1000 /* USB Product ID of CASSY-S modules with 8 bytes endpoint size */
39 #define USB_DEVICE_ID_LD_CASSY2 0x1001 /* USB Product ID of CASSY-S modules with 64 bytes endpoint size */
40 #define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */
41 #define USB_DEVICE_ID_LD_POCKETCASSY2 0x1011 /* USB Product ID of Pocket-CASSY 2 (reserved) */
42 #define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-CASSY */
43 #define USB_DEVICE_ID_LD_MOBILECASSY2 0x1021 /* USB Product ID of Mobile-CASSY 2 (reserved) */
44 #define USB_DEVICE_ID_LD_MICROCASSYVOLTAGE 0x1031 /* USB Product ID of Micro-CASSY Voltage */
45 #define USB_DEVICE_ID_LD_MICROCASSYCURRENT 0x1032 /* USB Product ID of Micro-CASSY Current */
46 #define USB_DEVICE_ID_LD_MICROCASSYTIME 0x1033 /* USB Product ID of Micro-CASSY Time (reserved) */
47 #define USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE 0x1035 /* USB Product ID of Micro-CASSY Temperature */
48 #define USB_DEVICE_ID_LD_MICROCASSYPH 0x1038 /* USB Product ID of Micro-CASSY pH */
49 #define USB_DEVICE_ID_LD_POWERANALYSERCASSY 0x1040 /* USB Product ID of Power Analyser CASSY */
50 #define USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY 0x1042 /* USB Product ID of Converter Controller CASSY */
51 #define USB_DEVICE_ID_LD_MACHINETESTCASSY 0x1043 /* USB Product ID of Machine Test CASSY */
52 #define USB_DEVICE_ID_LD_JWM 0x1080 /* USB Product ID of Joule and Wattmeter */
53 #define USB_DEVICE_ID_LD_DMMP 0x1081 /* USB Product ID of Digital Multimeter P (reserved) */
54 #define USB_DEVICE_ID_LD_UMIP 0x1090 /* USB Product ID of UMI P */
55 #define USB_DEVICE_ID_LD_UMIC 0x10A0 /* USB Product ID of UMI C */
56 #define USB_DEVICE_ID_LD_UMIB 0x10B0 /* USB Product ID of UMI B */
57 #define USB_DEVICE_ID_LD_XRAY 0x1100 /* USB Product ID of X-Ray Apparatus 55481 */
58 #define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus 554800 */
59 #define USB_DEVICE_ID_LD_XRAYCT 0x1110 /* USB Product ID of X-Ray Apparatus CT 554821*/
60 #define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */
61 #define USB_DEVICE_ID_LD_MOTOR 0x1210 /* USB Product ID of Motor (reserved) */
62 #define USB_DEVICE_ID_LD_COM3LAB 0x2000 /* USB Product ID of COM3LAB */
63 #define USB_DEVICE_ID_LD_TELEPORT 0x2010 /* USB Product ID of Terminal Adapter */
64 #define USB_DEVICE_ID_LD_NETWORKANALYSER 0x2020 /* USB Product ID of Network Analyser */
65 #define USB_DEVICE_ID_LD_POWERCONTROL 0x2030 /* USB Product ID of Converter Control Unit */
66 #define USB_DEVICE_ID_LD_MACHINETEST 0x2040 /* USB Product ID of Machine Test System */
67 #define USB_DEVICE_ID_LD_MOSTANALYSER 0x2050 /* USB Product ID of MOST Protocol Analyser */
68 #define USB_DEVICE_ID_LD_MOSTANALYSER2 0x2051 /* USB Product ID of MOST Protocol Analyser 2 */
69 #define USB_DEVICE_ID_LD_ABSESP 0x2060 /* USB Product ID of ABS ESP */
70 #define USB_DEVICE_ID_LD_AUTODATABUS 0x2070 /* USB Product ID of Automotive Data Buses */
71 #define USB_DEVICE_ID_LD_MCT 0x2080 /* USB Product ID of Microcontroller technique */
72 #define USB_DEVICE_ID_LD_HYBRID 0x2090 /* USB Product ID of Automotive Hybrid */
73 #define USB_DEVICE_ID_LD_HEATCONTROL 0x20A0 /* USB Product ID of Heat control */
75 #ifdef CONFIG_USB_DYNAMIC_MINORS
76 #define USB_LD_MINOR_BASE 0
78 #define USB_LD_MINOR_BASE 176
81 /* table of devices that work with this driver */
82 static const struct usb_device_id ld_usb_table[] = {
83 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) },
84 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY2) },
85 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) },
86 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY2) },
87 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) },
88 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY2) },
89 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYVOLTAGE) },
90 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYCURRENT) },
91 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTIME) },
92 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE) },
93 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYPH) },
94 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERANALYSERCASSY) },
95 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY) },
96 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETESTCASSY) },
97 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) },
98 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) },
99 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) },
100 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIC) },
101 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIB) },
102 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY) },
103 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) },
104 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) },
105 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOTOR) },
106 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) },
107 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) },
108 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) },
109 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) },
110 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) },
111 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER) },
112 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER2) },
113 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_ABSESP) },
114 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_AUTODATABUS) },
115 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MCT) },
116 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HYBRID) },
117 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HEATCONTROL) },
118 { } /* Terminating entry */
120 MODULE_DEVICE_TABLE(usb, ld_usb_table);
121 MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>");
122 MODULE_DESCRIPTION("LD USB Driver");
123 MODULE_LICENSE("GPL");
124 MODULE_SUPPORTED_DEVICE("LD USB Devices");
126 /* All interrupt in transfers are collected in a ring buffer to
127 * avoid racing conditions and get better performance of the driver.
129 static int ring_buffer_size = 128;
130 module_param(ring_buffer_size, int, 0000);
131 MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports");
133 /* The write_buffer can contain more than one interrupt out transfer.
135 static int write_buffer_size = 10;
136 module_param(write_buffer_size, int, 0000);
137 MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports");
139 /* As of kernel version 2.6.4 ehci-hcd uses an
140 * "only one interrupt transfer per frame" shortcut
141 * to simplify the scheduling of periodic transfers.
142 * This conflicts with our standard 1ms intervals for in and out URBs.
143 * We use default intervals of 2ms for in and 2ms for out transfers,
144 * which should be fast enough.
145 * Increase the interval to allow more devices that do interrupt transfers,
146 * or set to 1 to use the standard interval from the endpoint descriptors.
148 static int min_interrupt_in_interval = 2;
149 module_param(min_interrupt_in_interval, int, 0000);
150 MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms");
152 static int min_interrupt_out_interval = 2;
153 module_param(min_interrupt_out_interval, int, 0000);
154 MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms");
156 /* Structure to hold all of our device specific stuff */
158 struct mutex mutex; /* locks this structure */
159 struct usb_interface *intf; /* save off the usb interface pointer */
160 unsigned long disconnected:1;
162 int open_count; /* number of times this port has been opened */
165 unsigned int ring_head;
166 unsigned int ring_tail;
168 wait_queue_head_t read_wait;
169 wait_queue_head_t write_wait;
171 char *interrupt_in_buffer;
172 struct usb_endpoint_descriptor *interrupt_in_endpoint;
173 struct urb *interrupt_in_urb;
174 int interrupt_in_interval;
175 size_t interrupt_in_endpoint_size;
176 int interrupt_in_running;
177 int interrupt_in_done;
181 char *interrupt_out_buffer;
182 struct usb_endpoint_descriptor *interrupt_out_endpoint;
183 struct urb *interrupt_out_urb;
184 int interrupt_out_interval;
185 size_t interrupt_out_endpoint_size;
186 int interrupt_out_busy;
189 static struct usb_driver ld_usb_driver;
192 * ld_usb_abort_transfers
193 * aborts transfers and frees associated data structures
195 static void ld_usb_abort_transfers(struct ld_usb *dev)
197 /* shutdown transfer */
198 if (dev->interrupt_in_running) {
199 dev->interrupt_in_running = 0;
200 usb_kill_urb(dev->interrupt_in_urb);
202 if (dev->interrupt_out_busy)
203 usb_kill_urb(dev->interrupt_out_urb);
209 static void ld_usb_delete(struct ld_usb *dev)
211 /* free data structures */
212 usb_free_urb(dev->interrupt_in_urb);
213 usb_free_urb(dev->interrupt_out_urb);
214 kfree(dev->ring_buffer);
215 kfree(dev->interrupt_in_buffer);
216 kfree(dev->interrupt_out_buffer);
221 * ld_usb_interrupt_in_callback
223 static void ld_usb_interrupt_in_callback(struct urb *urb)
225 struct ld_usb *dev = urb->context;
226 size_t *actual_buffer;
227 unsigned int next_ring_head;
228 int status = urb->status;
232 if (status == -ENOENT ||
233 status == -ECONNRESET ||
234 status == -ESHUTDOWN) {
237 dev_dbg(&dev->intf->dev,
238 "%s: nonzero status received: %d\n", __func__,
240 spin_lock(&dev->rbsl);
241 goto resubmit; /* maybe we can recover */
245 spin_lock(&dev->rbsl);
246 if (urb->actual_length > 0) {
247 next_ring_head = (dev->ring_head+1) % ring_buffer_size;
248 if (next_ring_head != dev->ring_tail) {
249 actual_buffer = (size_t *)(dev->ring_buffer + dev->ring_head * (sizeof(size_t)+dev->interrupt_in_endpoint_size));
250 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */
251 *actual_buffer = urb->actual_length;
252 memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length);
253 dev->ring_head = next_ring_head;
254 dev_dbg(&dev->intf->dev, "%s: received %d bytes\n",
255 __func__, urb->actual_length);
257 dev_warn(&dev->intf->dev,
258 "Ring buffer overflow, %d bytes dropped\n",
260 dev->buffer_overflow = 1;
265 /* resubmit if we're still running */
266 if (dev->interrupt_in_running && !dev->buffer_overflow) {
267 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
269 dev_err(&dev->intf->dev,
270 "usb_submit_urb failed (%d)\n", retval);
271 dev->buffer_overflow = 1;
274 spin_unlock(&dev->rbsl);
276 dev->interrupt_in_done = 1;
277 wake_up_interruptible(&dev->read_wait);
281 * ld_usb_interrupt_out_callback
283 static void ld_usb_interrupt_out_callback(struct urb *urb)
285 struct ld_usb *dev = urb->context;
286 int status = urb->status;
288 /* sync/async unlink faults aren't errors */
289 if (status && !(status == -ENOENT ||
290 status == -ECONNRESET ||
291 status == -ESHUTDOWN))
292 dev_dbg(&dev->intf->dev,
293 "%s - nonzero write interrupt status received: %d\n",
296 dev->interrupt_out_busy = 0;
297 wake_up_interruptible(&dev->write_wait);
303 static int ld_usb_open(struct inode *inode, struct file *file)
308 struct usb_interface *interface;
310 nonseekable_open(inode, file);
311 subminor = iminor(inode);
313 interface = usb_find_interface(&ld_usb_driver, subminor);
316 printk(KERN_ERR "%s - error, can't find device for minor %d\n",
321 dev = usb_get_intfdata(interface);
326 /* lock this device */
327 if (mutex_lock_interruptible(&dev->mutex))
330 /* allow opening only once */
331 if (dev->open_count) {
337 /* initialize in direction */
340 dev->buffer_overflow = 0;
341 usb_fill_int_urb(dev->interrupt_in_urb,
342 interface_to_usbdev(interface),
343 usb_rcvintpipe(interface_to_usbdev(interface),
344 dev->interrupt_in_endpoint->bEndpointAddress),
345 dev->interrupt_in_buffer,
346 dev->interrupt_in_endpoint_size,
347 ld_usb_interrupt_in_callback,
349 dev->interrupt_in_interval);
351 dev->interrupt_in_running = 1;
352 dev->interrupt_in_done = 0;
354 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
356 dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval);
357 dev->interrupt_in_running = 0;
362 /* save device in the file's private structure */
363 file->private_data = dev;
366 mutex_unlock(&dev->mutex);
374 static int ld_usb_release(struct inode *inode, struct file *file)
379 dev = file->private_data;
386 mutex_lock(&dev->mutex);
388 if (dev->open_count != 1) {
392 if (dev->disconnected) {
393 /* the device was unplugged before the file was released */
394 mutex_unlock(&dev->mutex);
395 /* unlock here as ld_usb_delete frees dev */
400 /* wait until write transfer is finished */
401 if (dev->interrupt_out_busy)
402 wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ);
403 ld_usb_abort_transfers(dev);
407 mutex_unlock(&dev->mutex);
416 static unsigned int ld_usb_poll(struct file *file, poll_table *wait)
419 unsigned int mask = 0;
421 dev = file->private_data;
423 if (dev->disconnected)
424 return POLLERR | POLLHUP;
426 poll_wait(file, &dev->read_wait, wait);
427 poll_wait(file, &dev->write_wait, wait);
429 if (dev->ring_head != dev->ring_tail)
430 mask |= POLLIN | POLLRDNORM;
431 if (!dev->interrupt_out_busy)
432 mask |= POLLOUT | POLLWRNORM;
440 static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
444 size_t *actual_buffer;
445 size_t bytes_to_read;
449 dev = file->private_data;
451 /* verify that we actually have some data to read */
455 /* lock this object */
456 if (mutex_lock_interruptible(&dev->mutex)) {
457 retval = -ERESTARTSYS;
461 /* verify that the device wasn't unplugged */
462 if (dev->disconnected) {
464 printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval);
469 spin_lock_irq(&dev->rbsl);
470 while (dev->ring_head == dev->ring_tail) {
471 dev->interrupt_in_done = 0;
472 spin_unlock_irq(&dev->rbsl);
473 if (file->f_flags & O_NONBLOCK) {
477 retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done);
481 spin_lock_irq(&dev->rbsl);
483 spin_unlock_irq(&dev->rbsl);
485 /* actual_buffer contains actual_length + interrupt_in_buffer */
486 actual_buffer = (size_t *)(dev->ring_buffer + dev->ring_tail * (sizeof(size_t)+dev->interrupt_in_endpoint_size));
487 if (*actual_buffer > dev->interrupt_in_endpoint_size) {
491 bytes_to_read = min(count, *actual_buffer);
492 if (bytes_to_read < *actual_buffer)
493 dev_warn(&dev->intf->dev, "Read buffer overflow, %zu bytes dropped\n",
494 *actual_buffer-bytes_to_read);
496 /* copy one interrupt_in_buffer from ring_buffer into userspace */
497 if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) {
501 retval = bytes_to_read;
503 spin_lock_irq(&dev->rbsl);
504 dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
506 if (dev->buffer_overflow) {
507 dev->buffer_overflow = 0;
508 spin_unlock_irq(&dev->rbsl);
509 rv = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
511 dev->buffer_overflow = 1;
513 spin_unlock_irq(&dev->rbsl);
517 /* unlock the device */
518 mutex_unlock(&dev->mutex);
527 static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
528 size_t count, loff_t *ppos)
531 size_t bytes_to_write;
534 dev = file->private_data;
536 /* verify that we actually have some data to write */
540 /* lock this object */
541 if (mutex_lock_interruptible(&dev->mutex)) {
542 retval = -ERESTARTSYS;
546 /* verify that the device wasn't unplugged */
547 if (dev->disconnected) {
549 printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval);
553 /* wait until previous transfer is finished */
554 if (dev->interrupt_out_busy) {
555 if (file->f_flags & O_NONBLOCK) {
559 retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy);
565 /* write the data into interrupt_out_buffer from userspace */
566 bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size);
567 if (bytes_to_write < count)
568 dev_warn(&dev->intf->dev, "Write buffer overflow, %zu bytes dropped\n",
569 count - bytes_to_write);
570 dev_dbg(&dev->intf->dev, "%s: count = %zu, bytes_to_write = %zu\n",
571 __func__, count, bytes_to_write);
573 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
578 if (dev->interrupt_out_endpoint == NULL) {
579 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */
580 retval = usb_control_msg(interface_to_usbdev(dev->intf),
581 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0),
583 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
585 dev->interrupt_out_buffer,
587 USB_CTRL_SET_TIMEOUT);
589 dev_err(&dev->intf->dev,
590 "Couldn't submit HID_REQ_SET_REPORT %d\n",
595 /* send off the urb */
596 usb_fill_int_urb(dev->interrupt_out_urb,
597 interface_to_usbdev(dev->intf),
598 usb_sndintpipe(interface_to_usbdev(dev->intf),
599 dev->interrupt_out_endpoint->bEndpointAddress),
600 dev->interrupt_out_buffer,
602 ld_usb_interrupt_out_callback,
604 dev->interrupt_out_interval);
606 dev->interrupt_out_busy = 1;
609 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
611 dev->interrupt_out_busy = 0;
612 dev_err(&dev->intf->dev,
613 "Couldn't submit interrupt_out_urb %d\n", retval);
616 retval = bytes_to_write;
619 /* unlock the device */
620 mutex_unlock(&dev->mutex);
626 /* file operations needed when we register this driver */
627 static const struct file_operations ld_usb_fops = {
628 .owner = THIS_MODULE,
630 .write = ld_usb_write,
632 .release = ld_usb_release,
638 * usb class driver info in order to get a minor number from the usb core,
639 * and to have the device registered with the driver core
641 static struct usb_class_driver ld_usb_class = {
643 .fops = &ld_usb_fops,
644 .minor_base = USB_LD_MINOR_BASE,
650 * Called by the usb core when a new device is connected that it thinks
651 * this driver might be interested in.
653 static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
655 struct usb_device *udev = interface_to_usbdev(intf);
656 struct ld_usb *dev = NULL;
657 struct usb_host_interface *iface_desc;
659 int retval = -ENOMEM;
662 /* allocate memory for our device state and initialize it */
664 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
667 mutex_init(&dev->mutex);
668 spin_lock_init(&dev->rbsl);
670 init_waitqueue_head(&dev->read_wait);
671 init_waitqueue_head(&dev->write_wait);
673 /* workaround for early firmware versions on fast computers */
674 if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) &&
675 ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) ||
676 (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) &&
677 (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) {
678 buffer = kmalloc(256, GFP_KERNEL);
681 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */
682 usb_string(udev, 255, buffer, 256);
686 iface_desc = intf->cur_altsetting;
688 res = usb_find_last_int_in_endpoint(iface_desc,
689 &dev->interrupt_in_endpoint);
691 dev_err(&intf->dev, "Interrupt in endpoint not found\n");
696 res = usb_find_last_int_out_endpoint(iface_desc,
697 &dev->interrupt_out_endpoint);
699 dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n");
701 dev->interrupt_in_endpoint_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
702 dev->ring_buffer = kcalloc(ring_buffer_size,
703 sizeof(size_t) + dev->interrupt_in_endpoint_size,
705 if (!dev->ring_buffer)
707 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
708 if (!dev->interrupt_in_buffer)
710 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
711 if (!dev->interrupt_in_urb)
713 dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? usb_endpoint_maxp(dev->interrupt_out_endpoint) :
714 udev->descriptor.bMaxPacketSize0;
715 dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL);
716 if (!dev->interrupt_out_buffer)
718 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
719 if (!dev->interrupt_out_urb)
721 dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
722 if (dev->interrupt_out_endpoint)
723 dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
725 /* we can register the device now, as it is ready */
726 usb_set_intfdata(intf, dev);
728 retval = usb_register_dev(intf, &ld_usb_class);
730 /* something prevented us from registering this driver */
731 dev_err(&intf->dev, "Not able to get a minor for this device.\n");
732 usb_set_intfdata(intf, NULL);
736 /* let the user know what node this device is now attached to */
737 dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n",
738 (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor);
752 * Called by the usb core when the device is removed from the system.
754 static void ld_usb_disconnect(struct usb_interface *intf)
759 dev = usb_get_intfdata(intf);
760 usb_set_intfdata(intf, NULL);
764 /* give back our minor */
765 usb_deregister_dev(intf, &ld_usb_class);
767 usb_poison_urb(dev->interrupt_in_urb);
768 usb_poison_urb(dev->interrupt_out_urb);
770 mutex_lock(&dev->mutex);
772 /* if the device is not opened, then we clean up right now */
773 if (!dev->open_count) {
774 mutex_unlock(&dev->mutex);
777 dev->disconnected = 1;
778 /* wake up pollers */
779 wake_up_interruptible_all(&dev->read_wait);
780 wake_up_interruptible_all(&dev->write_wait);
781 mutex_unlock(&dev->mutex);
784 dev_info(&intf->dev, "LD USB Device #%d now disconnected\n",
785 (minor - USB_LD_MINOR_BASE));
788 /* usb specific object needed to register this driver with the usb subsystem */
789 static struct usb_driver ld_usb_driver = {
791 .probe = ld_usb_probe,
792 .disconnect = ld_usb_disconnect,
793 .id_table = ld_usb_table,
796 module_usb_driver(ld_usb_driver);