1 // SPDX-License-Identifier: GPL-2.0+
3 * Generic USB driver for report based interrupt in/out devices
4 * like LD Didactic's USB devices. LD Didactic's USB devices are
5 * HID devices which do not use HID report definitons (they use
6 * raw interrupt in and our reports only for communication).
8 * This driver uses a ring buffer for time critical reading of
9 * interrupt in reports and provides read and write methods for
10 * raw interrupt reports (similar to the Windows HID driver).
11 * Devices based on the book USB COMPLETE by Jan Axelson may need
12 * such a compatibility to the Windows HID driver.
14 * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de>
16 * Derived from Lego USB Tower driver
17 * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net>
18 * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
21 #include <linux/kernel.h>
22 #include <linux/errno.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/mutex.h>
27 #include <linux/uaccess.h>
28 #include <linux/input.h>
29 #include <linux/usb.h>
30 #include <linux/poll.h>
32 /* Define these values to match your devices */
33 #define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */
34 #define USB_DEVICE_ID_LD_CASSY 0x1000 /* USB Product ID of CASSY-S modules with 8 bytes endpoint size */
35 #define USB_DEVICE_ID_LD_CASSY2 0x1001 /* USB Product ID of CASSY-S modules with 64 bytes endpoint size */
36 #define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */
37 #define USB_DEVICE_ID_LD_POCKETCASSY2 0x1011 /* USB Product ID of Pocket-CASSY 2 (reserved) */
38 #define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-CASSY */
39 #define USB_DEVICE_ID_LD_MOBILECASSY2 0x1021 /* USB Product ID of Mobile-CASSY 2 (reserved) */
40 #define USB_DEVICE_ID_LD_MICROCASSYVOLTAGE 0x1031 /* USB Product ID of Micro-CASSY Voltage */
41 #define USB_DEVICE_ID_LD_MICROCASSYCURRENT 0x1032 /* USB Product ID of Micro-CASSY Current */
42 #define USB_DEVICE_ID_LD_MICROCASSYTIME 0x1033 /* USB Product ID of Micro-CASSY Time (reserved) */
43 #define USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE 0x1035 /* USB Product ID of Micro-CASSY Temperature */
44 #define USB_DEVICE_ID_LD_MICROCASSYPH 0x1038 /* USB Product ID of Micro-CASSY pH */
45 #define USB_DEVICE_ID_LD_POWERANALYSERCASSY 0x1040 /* USB Product ID of Power Analyser CASSY */
46 #define USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY 0x1042 /* USB Product ID of Converter Controller CASSY */
47 #define USB_DEVICE_ID_LD_MACHINETESTCASSY 0x1043 /* USB Product ID of Machine Test CASSY */
48 #define USB_DEVICE_ID_LD_JWM 0x1080 /* USB Product ID of Joule and Wattmeter */
49 #define USB_DEVICE_ID_LD_DMMP 0x1081 /* USB Product ID of Digital Multimeter P (reserved) */
50 #define USB_DEVICE_ID_LD_UMIP 0x1090 /* USB Product ID of UMI P */
51 #define USB_DEVICE_ID_LD_UMIC 0x10A0 /* USB Product ID of UMI C */
52 #define USB_DEVICE_ID_LD_UMIB 0x10B0 /* USB Product ID of UMI B */
53 #define USB_DEVICE_ID_LD_XRAY 0x1100 /* USB Product ID of X-Ray Apparatus 55481 */
54 #define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus 554800 */
55 #define USB_DEVICE_ID_LD_XRAYCT 0x1110 /* USB Product ID of X-Ray Apparatus CT 554821*/
56 #define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */
57 #define USB_DEVICE_ID_LD_MOTOR 0x1210 /* USB Product ID of Motor (reserved) */
58 #define USB_DEVICE_ID_LD_COM3LAB 0x2000 /* USB Product ID of COM3LAB */
59 #define USB_DEVICE_ID_LD_TELEPORT 0x2010 /* USB Product ID of Terminal Adapter */
60 #define USB_DEVICE_ID_LD_NETWORKANALYSER 0x2020 /* USB Product ID of Network Analyser */
61 #define USB_DEVICE_ID_LD_POWERCONTROL 0x2030 /* USB Product ID of Converter Control Unit */
62 #define USB_DEVICE_ID_LD_MACHINETEST 0x2040 /* USB Product ID of Machine Test System */
63 #define USB_DEVICE_ID_LD_MOSTANALYSER 0x2050 /* USB Product ID of MOST Protocol Analyser */
64 #define USB_DEVICE_ID_LD_MOSTANALYSER2 0x2051 /* USB Product ID of MOST Protocol Analyser 2 */
65 #define USB_DEVICE_ID_LD_ABSESP 0x2060 /* USB Product ID of ABS ESP */
66 #define USB_DEVICE_ID_LD_AUTODATABUS 0x2070 /* USB Product ID of Automotive Data Buses */
67 #define USB_DEVICE_ID_LD_MCT 0x2080 /* USB Product ID of Microcontroller technique */
68 #define USB_DEVICE_ID_LD_HYBRID 0x2090 /* USB Product ID of Automotive Hybrid */
69 #define USB_DEVICE_ID_LD_HEATCONTROL 0x20A0 /* USB Product ID of Heat control */
71 #ifdef CONFIG_USB_DYNAMIC_MINORS
72 #define USB_LD_MINOR_BASE 0
74 #define USB_LD_MINOR_BASE 176
77 /* table of devices that work with this driver */
78 static const struct usb_device_id ld_usb_table[] = {
79 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) },
80 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY2) },
81 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) },
82 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY2) },
83 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) },
84 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY2) },
85 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYVOLTAGE) },
86 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYCURRENT) },
87 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTIME) },
88 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE) },
89 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYPH) },
90 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERANALYSERCASSY) },
91 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY) },
92 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETESTCASSY) },
93 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) },
94 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) },
95 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) },
96 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIC) },
97 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIB) },
98 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY) },
99 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) },
100 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) },
101 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOTOR) },
102 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) },
103 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) },
104 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) },
105 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) },
106 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) },
107 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER) },
108 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER2) },
109 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_ABSESP) },
110 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_AUTODATABUS) },
111 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MCT) },
112 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HYBRID) },
113 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HEATCONTROL) },
114 { } /* Terminating entry */
116 MODULE_DEVICE_TABLE(usb, ld_usb_table);
117 MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>");
118 MODULE_DESCRIPTION("LD USB Driver");
119 MODULE_LICENSE("GPL");
120 MODULE_SUPPORTED_DEVICE("LD USB Devices");
122 /* All interrupt in transfers are collected in a ring buffer to
123 * avoid racing conditions and get better performance of the driver.
125 static int ring_buffer_size = 128;
126 module_param(ring_buffer_size, int, 0000);
127 MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports");
129 /* The write_buffer can contain more than one interrupt out transfer.
131 static int write_buffer_size = 10;
132 module_param(write_buffer_size, int, 0000);
133 MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports");
135 /* As of kernel version 2.6.4 ehci-hcd uses an
136 * "only one interrupt transfer per frame" shortcut
137 * to simplify the scheduling of periodic transfers.
138 * This conflicts with our standard 1ms intervals for in and out URBs.
139 * We use default intervals of 2ms for in and 2ms for out transfers,
140 * which should be fast enough.
141 * Increase the interval to allow more devices that do interrupt transfers,
142 * or set to 1 to use the standard interval from the endpoint descriptors.
144 static int min_interrupt_in_interval = 2;
145 module_param(min_interrupt_in_interval, int, 0000);
146 MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms");
148 static int min_interrupt_out_interval = 2;
149 module_param(min_interrupt_out_interval, int, 0000);
150 MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms");
152 /* Structure to hold all of our device specific stuff */
154 struct mutex mutex; /* locks this structure */
155 struct usb_interface *intf; /* save off the usb interface pointer */
156 unsigned long disconnected:1;
158 int open_count; /* number of times this port has been opened */
161 unsigned int ring_head;
162 unsigned int ring_tail;
164 wait_queue_head_t read_wait;
165 wait_queue_head_t write_wait;
167 char *interrupt_in_buffer;
168 struct usb_endpoint_descriptor *interrupt_in_endpoint;
169 struct urb *interrupt_in_urb;
170 int interrupt_in_interval;
171 size_t interrupt_in_endpoint_size;
172 int interrupt_in_running;
173 int interrupt_in_done;
177 char *interrupt_out_buffer;
178 struct usb_endpoint_descriptor *interrupt_out_endpoint;
179 struct urb *interrupt_out_urb;
180 int interrupt_out_interval;
181 size_t interrupt_out_endpoint_size;
182 int interrupt_out_busy;
185 static struct usb_driver ld_usb_driver;
188 * ld_usb_abort_transfers
189 * aborts transfers and frees associated data structures
191 static void ld_usb_abort_transfers(struct ld_usb *dev)
193 /* shutdown transfer */
194 if (dev->interrupt_in_running) {
195 dev->interrupt_in_running = 0;
196 usb_kill_urb(dev->interrupt_in_urb);
198 if (dev->interrupt_out_busy)
199 usb_kill_urb(dev->interrupt_out_urb);
205 static void ld_usb_delete(struct ld_usb *dev)
207 /* free data structures */
208 usb_free_urb(dev->interrupt_in_urb);
209 usb_free_urb(dev->interrupt_out_urb);
210 kfree(dev->ring_buffer);
211 kfree(dev->interrupt_in_buffer);
212 kfree(dev->interrupt_out_buffer);
217 * ld_usb_interrupt_in_callback
219 static void ld_usb_interrupt_in_callback(struct urb *urb)
221 struct ld_usb *dev = urb->context;
222 size_t *actual_buffer;
223 unsigned int next_ring_head;
224 int status = urb->status;
229 if (status == -ENOENT ||
230 status == -ECONNRESET ||
231 status == -ESHUTDOWN) {
234 dev_dbg(&dev->intf->dev,
235 "%s: nonzero status received: %d\n", __func__,
237 spin_lock_irqsave(&dev->rbsl, flags);
238 goto resubmit; /* maybe we can recover */
242 spin_lock_irqsave(&dev->rbsl, flags);
243 if (urb->actual_length > 0) {
244 next_ring_head = (dev->ring_head+1) % ring_buffer_size;
245 if (next_ring_head != dev->ring_tail) {
246 actual_buffer = (size_t *)(dev->ring_buffer + dev->ring_head * (sizeof(size_t)+dev->interrupt_in_endpoint_size));
247 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */
248 *actual_buffer = urb->actual_length;
249 memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length);
250 dev->ring_head = next_ring_head;
251 dev_dbg(&dev->intf->dev, "%s: received %d bytes\n",
252 __func__, urb->actual_length);
254 dev_warn(&dev->intf->dev,
255 "Ring buffer overflow, %d bytes dropped\n",
257 dev->buffer_overflow = 1;
262 /* resubmit if we're still running */
263 if (dev->interrupt_in_running && !dev->buffer_overflow) {
264 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
266 dev_err(&dev->intf->dev,
267 "usb_submit_urb failed (%d)\n", retval);
268 dev->buffer_overflow = 1;
271 spin_unlock_irqrestore(&dev->rbsl, flags);
273 dev->interrupt_in_done = 1;
274 wake_up_interruptible(&dev->read_wait);
278 * ld_usb_interrupt_out_callback
280 static void ld_usb_interrupt_out_callback(struct urb *urb)
282 struct ld_usb *dev = urb->context;
283 int status = urb->status;
285 /* sync/async unlink faults aren't errors */
286 if (status && !(status == -ENOENT ||
287 status == -ECONNRESET ||
288 status == -ESHUTDOWN))
289 dev_dbg(&dev->intf->dev,
290 "%s - nonzero write interrupt status received: %d\n",
293 dev->interrupt_out_busy = 0;
294 wake_up_interruptible(&dev->write_wait);
300 static int ld_usb_open(struct inode *inode, struct file *file)
305 struct usb_interface *interface;
307 stream_open(inode, file);
308 subminor = iminor(inode);
310 interface = usb_find_interface(&ld_usb_driver, subminor);
313 printk(KERN_ERR "%s - error, can't find device for minor %d\n",
318 dev = usb_get_intfdata(interface);
323 /* lock this device */
324 if (mutex_lock_interruptible(&dev->mutex))
327 /* allow opening only once */
328 if (dev->open_count) {
334 /* initialize in direction */
337 dev->buffer_overflow = 0;
338 usb_fill_int_urb(dev->interrupt_in_urb,
339 interface_to_usbdev(interface),
340 usb_rcvintpipe(interface_to_usbdev(interface),
341 dev->interrupt_in_endpoint->bEndpointAddress),
342 dev->interrupt_in_buffer,
343 dev->interrupt_in_endpoint_size,
344 ld_usb_interrupt_in_callback,
346 dev->interrupt_in_interval);
348 dev->interrupt_in_running = 1;
349 dev->interrupt_in_done = 0;
351 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
353 dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval);
354 dev->interrupt_in_running = 0;
359 /* save device in the file's private structure */
360 file->private_data = dev;
363 mutex_unlock(&dev->mutex);
371 static int ld_usb_release(struct inode *inode, struct file *file)
376 dev = file->private_data;
383 if (mutex_lock_interruptible(&dev->mutex)) {
384 retval = -ERESTARTSYS;
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 __poll_t ld_usb_poll(struct file *file, poll_table *wait)
421 dev = file->private_data;
423 if (dev->disconnected)
424 return EPOLLERR | EPOLLHUP;
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 |= EPOLLIN | EPOLLRDNORM;
431 if (!dev->interrupt_out_busy)
432 mask |= EPOLLOUT | EPOLLWRNORM;
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 if (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_unlock_irq(&dev->rbsl);
484 /* actual_buffer contains actual_length + interrupt_in_buffer */
485 actual_buffer = (size_t *)(dev->ring_buffer + dev->ring_tail * (sizeof(size_t)+dev->interrupt_in_endpoint_size));
486 bytes_to_read = min(count, *actual_buffer);
487 if (bytes_to_read < *actual_buffer)
488 dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n",
489 *actual_buffer-bytes_to_read);
491 /* copy one interrupt_in_buffer from ring_buffer into userspace */
492 if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) {
496 dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size;
498 retval = bytes_to_read;
500 spin_lock_irq(&dev->rbsl);
501 if (dev->buffer_overflow) {
502 dev->buffer_overflow = 0;
503 spin_unlock_irq(&dev->rbsl);
504 rv = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
506 dev->buffer_overflow = 1;
508 spin_unlock_irq(&dev->rbsl);
512 /* unlock the device */
513 mutex_unlock(&dev->mutex);
522 static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
523 size_t count, loff_t *ppos)
526 size_t bytes_to_write;
529 dev = file->private_data;
531 /* verify that we actually have some data to write */
535 /* lock this object */
536 if (mutex_lock_interruptible(&dev->mutex)) {
537 retval = -ERESTARTSYS;
541 /* verify that the device wasn't unplugged */
542 if (dev->disconnected) {
544 printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval);
548 /* wait until previous transfer is finished */
549 if (dev->interrupt_out_busy) {
550 if (file->f_flags & O_NONBLOCK) {
554 retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy);
560 /* write the data into interrupt_out_buffer from userspace */
561 bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size);
562 if (bytes_to_write < count)
563 dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n", count-bytes_to_write);
564 dev_dbg(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n",
565 __func__, count, bytes_to_write);
567 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
572 if (dev->interrupt_out_endpoint == NULL) {
573 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */
574 retval = usb_control_msg(interface_to_usbdev(dev->intf),
575 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0),
577 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
579 dev->interrupt_out_buffer,
581 USB_CTRL_SET_TIMEOUT * HZ);
583 dev_err(&dev->intf->dev,
584 "Couldn't submit HID_REQ_SET_REPORT %d\n",
589 /* send off the urb */
590 usb_fill_int_urb(dev->interrupt_out_urb,
591 interface_to_usbdev(dev->intf),
592 usb_sndintpipe(interface_to_usbdev(dev->intf),
593 dev->interrupt_out_endpoint->bEndpointAddress),
594 dev->interrupt_out_buffer,
596 ld_usb_interrupt_out_callback,
598 dev->interrupt_out_interval);
600 dev->interrupt_out_busy = 1;
603 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
605 dev->interrupt_out_busy = 0;
606 dev_err(&dev->intf->dev,
607 "Couldn't submit interrupt_out_urb %d\n", retval);
610 retval = bytes_to_write;
613 /* unlock the device */
614 mutex_unlock(&dev->mutex);
620 /* file operations needed when we register this driver */
621 static const struct file_operations ld_usb_fops = {
622 .owner = THIS_MODULE,
624 .write = ld_usb_write,
626 .release = ld_usb_release,
632 * usb class driver info in order to get a minor number from the usb core,
633 * and to have the device registered with the driver core
635 static struct usb_class_driver ld_usb_class = {
637 .fops = &ld_usb_fops,
638 .minor_base = USB_LD_MINOR_BASE,
644 * Called by the usb core when a new device is connected that it thinks
645 * this driver might be interested in.
647 static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
649 struct usb_device *udev = interface_to_usbdev(intf);
650 struct ld_usb *dev = NULL;
651 struct usb_host_interface *iface_desc;
653 int retval = -ENOMEM;
656 /* allocate memory for our device state and initialize it */
658 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
661 mutex_init(&dev->mutex);
662 spin_lock_init(&dev->rbsl);
664 init_waitqueue_head(&dev->read_wait);
665 init_waitqueue_head(&dev->write_wait);
667 /* workaround for early firmware versions on fast computers */
668 if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) &&
669 ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) ||
670 (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) &&
671 (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) {
672 buffer = kmalloc(256, GFP_KERNEL);
675 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */
676 usb_string(udev, 255, buffer, 256);
680 iface_desc = intf->cur_altsetting;
682 res = usb_find_last_int_in_endpoint(iface_desc,
683 &dev->interrupt_in_endpoint);
685 dev_err(&intf->dev, "Interrupt in endpoint not found\n");
690 res = usb_find_last_int_out_endpoint(iface_desc,
691 &dev->interrupt_out_endpoint);
693 dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n");
695 dev->interrupt_in_endpoint_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
697 kmalloc_array(ring_buffer_size,
698 sizeof(size_t) + dev->interrupt_in_endpoint_size,
700 if (!dev->ring_buffer)
702 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
703 if (!dev->interrupt_in_buffer)
705 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
706 if (!dev->interrupt_in_urb)
708 dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? usb_endpoint_maxp(dev->interrupt_out_endpoint) :
709 udev->descriptor.bMaxPacketSize0;
710 dev->interrupt_out_buffer =
711 kmalloc_array(write_buffer_size,
712 dev->interrupt_out_endpoint_size, GFP_KERNEL);
713 if (!dev->interrupt_out_buffer)
715 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
716 if (!dev->interrupt_out_urb)
718 dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
719 if (dev->interrupt_out_endpoint)
720 dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
722 /* we can register the device now, as it is ready */
723 usb_set_intfdata(intf, dev);
725 retval = usb_register_dev(intf, &ld_usb_class);
727 /* something prevented us from registering this driver */
728 dev_err(&intf->dev, "Not able to get a minor for this device.\n");
729 usb_set_intfdata(intf, NULL);
733 /* let the user know what node this device is now attached to */
734 dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n",
735 (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor);
749 * Called by the usb core when the device is removed from the system.
751 static void ld_usb_disconnect(struct usb_interface *intf)
756 dev = usb_get_intfdata(intf);
757 usb_set_intfdata(intf, NULL);
761 /* give back our minor */
762 usb_deregister_dev(intf, &ld_usb_class);
764 usb_poison_urb(dev->interrupt_in_urb);
765 usb_poison_urb(dev->interrupt_out_urb);
767 mutex_lock(&dev->mutex);
769 /* if the device is not opened, then we clean up right now */
770 if (!dev->open_count) {
771 mutex_unlock(&dev->mutex);
774 dev->disconnected = 1;
775 /* wake up pollers */
776 wake_up_interruptible_all(&dev->read_wait);
777 wake_up_interruptible_all(&dev->write_wait);
778 mutex_unlock(&dev->mutex);
781 dev_info(&intf->dev, "LD USB Device #%d now disconnected\n",
782 (minor - USB_LD_MINOR_BASE));
785 /* usb specific object needed to register this driver with the usb subsystem */
786 static struct usb_driver ld_usb_driver = {
788 .probe = ld_usb_probe,
789 .disconnect = ld_usb_disconnect,
790 .id_table = ld_usb_table,
793 module_usb_driver(ld_usb_driver);