2 * drivers/usb/class/usbtmc.c - USB Test & Measurment class driver
4 * Copyright (C) 2007 Stefan Kopp, Gechingen, Germany
5 * Copyright (C) 2008 Novell, Inc.
6 * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * The GNU General Public License is available at
19 * http://www.gnu.org/copyleft/gpl.html.
22 #include <linux/init.h>
23 #include <linux/module.h>
25 #include <linux/uaccess.h>
26 #include <linux/kref.h>
27 #include <linux/mutex.h>
28 #include <linux/usb.h>
29 #include <linux/usb/tmc.h>
32 #define USBTMC_MINOR_BASE 176
35 * Size of driver internal IO buffer. Must be multiple of 4 and at least as
36 * large as wMaxPacketSize (which is usually 512 bytes).
38 #define USBTMC_SIZE_IOBUFFER 2048
40 /* Default USB timeout (in milliseconds) */
41 #define USBTMC_TIMEOUT 10
44 * Maximum number of read cycles to empty bulk in endpoint during CLEAR and
45 * ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short
46 * packet is never read.
48 #define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100
50 static struct usb_device_id usbtmc_devices[] = {
51 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), },
52 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), },
53 { 0, } /* terminating entry */
55 MODULE_DEVICE_TABLE(usb, usbtmc_devices);
58 * This structure is the capabilities for the device
59 * See section 4.2.1.8 of the USBTMC specification for details.
61 struct usbtmc_dev_capabilities {
62 __u8 interface_capabilities;
63 __u8 device_capabilities;
64 __u8 usb488_interface_capabilities;
65 __u8 usb488_device_capabilities;
68 /* This structure holds private data for each USBTMC device. One copy is
69 * allocated for each USBTMC device in the driver's probe function.
71 struct usbtmc_device_data {
72 const struct usb_device_id *id;
73 struct usb_device *usb_dev;
74 struct usb_interface *intf;
77 unsigned int bulk_out;
80 u8 bTag_last_write; /* needed for abort */
81 u8 bTag_last_read; /* needed for abort */
83 /* attributes from the USB TMC spec for this device */
88 struct usbtmc_dev_capabilities capabilities;
90 struct mutex io_mutex; /* only one i/o function running at a time */
92 #define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
94 /* Forward declarations */
95 static struct usb_driver usbtmc_driver;
97 static void usbtmc_delete(struct kref *kref)
99 struct usbtmc_device_data *data = to_usbtmc_data(kref);
101 usb_put_dev(data->usb_dev);
105 static int usbtmc_open(struct inode *inode, struct file *filp)
107 struct usb_interface *intf;
108 struct usbtmc_device_data *data;
111 intf = usb_find_interface(&usbtmc_driver, iminor(inode));
113 printk(KERN_ERR KBUILD_MODNAME
114 ": can not find device for minor %d", iminor(inode));
119 data = usb_get_intfdata(intf);
120 kref_get(&data->kref);
122 /* Store pointer in file structure's private data field */
123 filp->private_data = data;
129 static int usbtmc_release(struct inode *inode, struct file *file)
131 struct usbtmc_device_data *data = file->private_data;
133 kref_put(&data->kref, usbtmc_delete);
137 static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data)
144 struct usb_host_interface *current_setting;
147 dev = &data->intf->dev;
148 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
152 rv = usb_control_msg(data->usb_dev,
153 usb_rcvctrlpipe(data->usb_dev, 0),
154 USBTMC_REQUEST_INITIATE_ABORT_BULK_IN,
155 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
156 data->bTag_last_read, data->bulk_in,
157 buffer, 2, USBTMC_TIMEOUT);
160 dev_err(dev, "usb_control_msg returned %d\n", rv);
164 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
166 if (buffer[0] == USBTMC_STATUS_FAILED) {
171 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
172 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n",
179 current_setting = data->intf->cur_altsetting;
180 for (n = 0; n < current_setting->desc.bNumEndpoints; n++)
181 if (current_setting->endpoint[n].desc.bEndpointAddress ==
183 max_size = le16_to_cpu(current_setting->endpoint[n].
184 desc.wMaxPacketSize);
187 dev_err(dev, "Couldn't get wMaxPacketSize\n");
192 dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size);
197 dev_dbg(dev, "Reading from bulk in EP\n");
199 rv = usb_bulk_msg(data->usb_dev,
200 usb_rcvbulkpipe(data->usb_dev,
202 buffer, USBTMC_SIZE_IOBUFFER,
203 &actual, USBTMC_TIMEOUT);
208 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
211 } while ((actual == max_size) &&
212 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
214 if (actual == max_size) {
215 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
216 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
223 usbtmc_abort_bulk_in_status:
224 rv = usb_control_msg(data->usb_dev,
225 usb_rcvctrlpipe(data->usb_dev, 0),
226 USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS,
227 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
228 0, data->bulk_in, buffer, 0x08,
232 dev_err(dev, "usb_control_msg returned %d\n", rv);
236 dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
238 if (buffer[0] == USBTMC_STATUS_SUCCESS) {
243 if (buffer[0] != USBTMC_STATUS_PENDING) {
244 dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
251 dev_dbg(dev, "Reading from bulk in EP\n");
253 rv = usb_bulk_msg(data->usb_dev,
254 usb_rcvbulkpipe(data->usb_dev,
256 buffer, USBTMC_SIZE_IOBUFFER,
257 &actual, USBTMC_TIMEOUT);
262 dev_err(dev, "usb_bulk_msg returned %d\n", rv);
265 } while ((actual = max_size) &&
266 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
268 if (actual == max_size) {
269 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
270 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
275 goto usbtmc_abort_bulk_in_status;
283 static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data)
290 dev = &data->intf->dev;
292 buffer = kmalloc(8, GFP_KERNEL);
296 rv = usb_control_msg(data->usb_dev,
297 usb_rcvctrlpipe(data->usb_dev, 0),
298 USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT,
299 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
300 data->bTag_last_write, data->bulk_out,
301 buffer, 2, USBTMC_TIMEOUT);
304 dev_err(dev, "usb_control_msg returned %d\n", rv);
308 dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]);
310 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
311 dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n",
319 usbtmc_abort_bulk_out_check_status:
320 rv = usb_control_msg(data->usb_dev,
321 usb_rcvctrlpipe(data->usb_dev, 0),
322 USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS,
323 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
324 0, data->bulk_out, buffer, 0x08,
328 dev_err(dev, "usb_control_msg returned %d\n", rv);
332 dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]);
334 if (buffer[0] == USBTMC_STATUS_SUCCESS)
335 goto usbtmc_abort_bulk_out_clear_halt;
337 if ((buffer[0] == USBTMC_STATUS_PENDING) &&
338 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN))
339 goto usbtmc_abort_bulk_out_check_status;
344 usbtmc_abort_bulk_out_clear_halt:
345 rv = usb_control_msg(data->usb_dev,
346 usb_sndctrlpipe(data->usb_dev, 0),
347 USB_REQ_CLEAR_FEATURE,
348 USB_DIR_OUT | USB_TYPE_STANDARD |
350 USB_ENDPOINT_HALT, data->bulk_out, buffer,
354 dev_err(dev, "usb_control_msg returned %d\n", rv);
364 static ssize_t usbtmc_read(struct file *filp, char __user *buf,
365 size_t count, loff_t *f_pos)
367 struct usbtmc_device_data *data;
369 unsigned long int n_characters;
377 /* Get pointer to private data structure */
378 data = filp->private_data;
379 dev = &data->intf->dev;
381 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
385 mutex_lock(&data->io_mutex);
390 while (remaining > 0) {
391 if (remaining > USBTMC_SIZE_IOBUFFER - 12 - 3)
392 this_part = USBTMC_SIZE_IOBUFFER - 12 - 3;
394 this_part = remaining;
396 /* Setup IO buffer for DEV_DEP_MSG_IN message
397 * Refer to class specs for details
400 buffer[1] = data->bTag;
401 buffer[2] = ~(data->bTag);
402 buffer[3] = 0; /* Reserved */
403 buffer[4] = (this_part - 12 - 3) & 255;
404 buffer[5] = ((this_part - 12 - 3) >> 8) & 255;
405 buffer[6] = ((this_part - 12 - 3) >> 16) & 255;
406 buffer[7] = ((this_part - 12 - 3) >> 24) & 255;
407 buffer[8] = data->TermCharEnabled * 2;
408 /* Use term character? */
409 buffer[9] = data->TermChar;
410 buffer[10] = 0; /* Reserved */
411 buffer[11] = 0; /* Reserved */
414 retval = usb_bulk_msg(data->usb_dev,
415 usb_sndbulkpipe(data->usb_dev,
417 buffer, 12, &actual, USBTMC_TIMEOUT);
419 /* Store bTag (in case we need to abort) */
420 data->bTag_last_write = data->bTag;
422 /* Increment bTag -- and increment again if zero */
428 dev_err(dev, "usb_bulk_msg returned %d\n", retval);
429 if (data->auto_abort)
430 usbtmc_ioctl_abort_bulk_out(data);
435 retval = usb_bulk_msg(data->usb_dev,
436 usb_rcvbulkpipe(data->usb_dev,
438 buffer, USBTMC_SIZE_IOBUFFER, &actual,
441 /* Store bTag (in case we need to abort) */
442 data->bTag_last_read = data->bTag;
445 dev_err(dev, "Unable to read data, error %d\n", retval);
446 if (data->auto_abort)
447 usbtmc_ioctl_abort_bulk_in(data);
451 /* How many characters did the instrument send? */
452 n_characters = buffer[4] +
457 /* Copy buffer to user space */
458 if (copy_to_user(buf + done, &buffer[12], n_characters)) {
459 /* There must have been an addressing problem */
464 done += n_characters;
465 if (n_characters < USBTMC_SIZE_IOBUFFER)
469 /* Update file position value */
470 *f_pos = *f_pos + done;
474 mutex_unlock(&data->io_mutex);
479 static ssize_t usbtmc_write(struct file *filp, const char __user *buf,
480 size_t count, loff_t *f_pos)
482 struct usbtmc_device_data *data;
486 unsigned long int n_bytes;
492 data = filp->private_data;
494 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
498 mutex_lock(&data->io_mutex);
503 while (remaining > 0) {
504 if (remaining > USBTMC_SIZE_IOBUFFER - 12) {
505 this_part = USBTMC_SIZE_IOBUFFER - 12;
508 this_part = remaining;
512 /* Setup IO buffer for DEV_DEP_MSG_OUT message */
514 buffer[1] = data->bTag;
515 buffer[2] = ~(data->bTag);
516 buffer[3] = 0; /* Reserved */
517 buffer[4] = this_part & 255;
518 buffer[5] = (this_part >> 8) & 255;
519 buffer[6] = (this_part >> 16) & 255;
520 buffer[7] = (this_part >> 24) & 255;
521 /* buffer[8] is set above... */
522 buffer[9] = 0; /* Reserved */
523 buffer[10] = 0; /* Reserved */
524 buffer[11] = 0; /* Reserved */
526 if (copy_from_user(&buffer[12], buf + done, this_part)) {
531 n_bytes = 12 + this_part;
533 n_bytes += 4 - this_part % 4;
534 for (n = 12 + this_part; n < n_bytes; n++)
537 retval = usb_bulk_msg(data->usb_dev,
538 usb_sndbulkpipe(data->usb_dev,
540 buffer, n_bytes, &actual, USBTMC_TIMEOUT);
542 data->bTag_last_write = data->bTag;
549 dev_err(&data->intf->dev,
550 "Unable to send data, error %d\n", retval);
551 if (data->auto_abort)
552 usbtmc_ioctl_abort_bulk_out(data);
556 remaining -= this_part;
562 mutex_unlock(&data->io_mutex);
567 static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
569 struct usb_host_interface *current_setting;
570 struct usb_endpoint_descriptor *desc;
578 dev = &data->intf->dev;
580 dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
582 buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
586 rv = usb_control_msg(data->usb_dev,
587 usb_rcvctrlpipe(data->usb_dev, 0),
588 USBTMC_REQUEST_INITIATE_CLEAR,
589 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
590 0, 0, buffer, 1, USBTMC_TIMEOUT);
592 dev_err(dev, "usb_control_msg returned %d\n", rv);
596 dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
598 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
599 dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
605 current_setting = data->intf->cur_altsetting;
606 for (n = 0; n < current_setting->desc.bNumEndpoints; n++) {
607 desc = ¤t_setting->endpoint[n].desc;
608 if (desc->bEndpointAddress == data->bulk_in)
609 max_size = le16_to_cpu(desc->wMaxPacketSize);
613 dev_err(dev, "Couldn't get wMaxPacketSize\n");
618 dev_dbg(dev, "wMaxPacketSize is %d\n", max_size);
622 usbtmc_clear_check_status:
624 dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n");
626 rv = usb_control_msg(data->usb_dev,
627 usb_rcvctrlpipe(data->usb_dev, 0),
628 USBTMC_REQUEST_CHECK_CLEAR_STATUS,
629 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
630 0, 0, buffer, 2, USBTMC_TIMEOUT);
632 dev_err(dev, "usb_control_msg returned %d\n", rv);
636 dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
638 if (buffer[0] == USBTMC_STATUS_SUCCESS)
639 goto usbtmc_clear_bulk_out_halt;
641 if (buffer[0] != USBTMC_STATUS_PENDING) {
642 dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
649 dev_dbg(dev, "Reading from bulk in EP\n");
651 rv = usb_bulk_msg(data->usb_dev,
652 usb_rcvbulkpipe(data->usb_dev,
654 buffer, USBTMC_SIZE_IOBUFFER,
655 &actual, USBTMC_TIMEOUT);
659 dev_err(dev, "usb_control_msg returned %d\n",
663 } while ((actual == max_size) &&
664 (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
666 if (actual == max_size) {
667 dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
668 USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
673 goto usbtmc_clear_check_status;
675 usbtmc_clear_bulk_out_halt:
677 rv = usb_control_msg(data->usb_dev,
678 usb_sndctrlpipe(data->usb_dev, 0),
679 USB_REQ_CLEAR_FEATURE,
680 USB_DIR_OUT | USB_TYPE_STANDARD |
683 data->bulk_out, buffer, 0,
686 dev_err(dev, "usb_control_msg returned %d\n", rv);
696 static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data)
701 buffer = kmalloc(2, GFP_KERNEL);
705 rv = usb_control_msg(data->usb_dev,
706 usb_sndctrlpipe(data->usb_dev, 0),
707 USB_REQ_CLEAR_FEATURE,
708 USB_DIR_OUT | USB_TYPE_STANDARD |
710 USB_ENDPOINT_HALT, data->bulk_out,
711 buffer, 0, USBTMC_TIMEOUT);
714 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
725 static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data)
730 buffer = kmalloc(2, GFP_KERNEL);
734 rv = usb_control_msg(data->usb_dev, usb_sndctrlpipe(data->usb_dev, 0),
735 USB_REQ_CLEAR_FEATURE,
736 USB_DIR_OUT | USB_TYPE_STANDARD |
738 USB_ENDPOINT_HALT, data->bulk_in, buffer, 0,
742 dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
753 static int get_capabilities(struct usbtmc_device_data *data)
755 struct device *dev = &data->usb_dev->dev;
759 buffer = kmalloc(0x18, GFP_KERNEL);
763 rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0),
764 USBTMC_REQUEST_GET_CAPABILITIES,
765 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
766 0, 0, buffer, 0x18, USBTMC_TIMEOUT);
768 dev_err(dev, "usb_control_msg returned %d\n", rv);
772 dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
773 dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]);
774 dev_dbg(dev, "Device capabilities are %x\n", buffer[5]);
775 dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]);
776 dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]);
777 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
778 dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
782 data->capabilities.interface_capabilities = buffer[4];
783 data->capabilities.device_capabilities = buffer[5];
784 data->capabilities.usb488_interface_capabilities = buffer[14];
785 data->capabilities.usb488_device_capabilities = buffer[15];
791 #define capability_attribute(name) \
792 static ssize_t show_##name(struct device *dev, \
793 struct device_attribute *attr, char *buf) \
795 struct usb_interface *intf = to_usb_interface(dev); \
796 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
798 return sprintf(buf, "%d\n", data->capabilities.name); \
800 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
802 capability_attribute(interface_capabilities);
803 capability_attribute(device_capabilities);
804 capability_attribute(usb488_interface_capabilities);
805 capability_attribute(usb488_device_capabilities);
807 static struct attribute *capability_attrs[] = {
808 &dev_attr_interface_capabilities.attr,
809 &dev_attr_device_capabilities.attr,
810 &dev_attr_usb488_interface_capabilities.attr,
811 &dev_attr_usb488_device_capabilities.attr,
815 static struct attribute_group capability_attr_grp = {
816 .attrs = capability_attrs,
819 static ssize_t show_TermChar(struct device *dev,
820 struct device_attribute *attr, char *buf)
822 struct usb_interface *intf = to_usb_interface(dev);
823 struct usbtmc_device_data *data = usb_get_intfdata(intf);
825 return sprintf(buf, "%c\n", data->TermChar);
828 static ssize_t store_TermChar(struct device *dev,
829 struct device_attribute *attr,
830 const char *buf, size_t count)
832 struct usb_interface *intf = to_usb_interface(dev);
833 struct usbtmc_device_data *data = usb_get_intfdata(intf);
837 data->TermChar = buf[0];
840 static DEVICE_ATTR(TermChar, S_IRUGO, show_TermChar, store_TermChar);
842 #define data_attribute(name) \
843 static ssize_t show_##name(struct device *dev, \
844 struct device_attribute *attr, char *buf) \
846 struct usb_interface *intf = to_usb_interface(dev); \
847 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
849 return sprintf(buf, "%d\n", data->name); \
851 static ssize_t store_##name(struct device *dev, \
852 struct device_attribute *attr, \
853 const char *buf, size_t count) \
855 struct usb_interface *intf = to_usb_interface(dev); \
856 struct usbtmc_device_data *data = usb_get_intfdata(intf); \
860 result = sscanf(buf, "%u\n", &val); \
869 static DEVICE_ATTR(name, S_IRUGO, show_##name, store_##name)
871 data_attribute(TermCharEnabled);
872 data_attribute(auto_abort);
874 static struct attribute *data_attrs[] = {
875 &dev_attr_TermChar.attr,
876 &dev_attr_TermCharEnabled.attr,
877 &dev_attr_auto_abort.attr,
881 static struct attribute_group data_attr_grp = {
885 static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data)
891 dev = &data->intf->dev;
893 buffer = kmalloc(2, GFP_KERNEL);
897 rv = usb_control_msg(data->usb_dev,
898 usb_rcvctrlpipe(data->usb_dev, 0),
899 USBTMC_REQUEST_INDICATOR_PULSE,
900 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
901 0, 0, buffer, 0x01, USBTMC_TIMEOUT);
904 dev_err(dev, "usb_control_msg returned %d\n", rv);
908 dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
910 if (buffer[0] != USBTMC_STATUS_SUCCESS) {
911 dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
922 static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
924 struct usbtmc_device_data *data;
925 int retval = -EBADRQC;
927 data = file->private_data;
928 mutex_lock(&data->io_mutex);
931 case USBTMC_IOCTL_CLEAR_OUT_HALT:
932 retval = usbtmc_ioctl_clear_out_halt(data);
934 case USBTMC_IOCTL_CLEAR_IN_HALT:
935 retval = usbtmc_ioctl_clear_in_halt(data);
937 case USBTMC_IOCTL_INDICATOR_PULSE:
938 retval = usbtmc_ioctl_indicator_pulse(data);
940 case USBTMC_IOCTL_CLEAR:
941 retval = usbtmc_ioctl_clear(data);
943 case USBTMC_IOCTL_ABORT_BULK_OUT:
944 retval = usbtmc_ioctl_abort_bulk_out(data);
946 case USBTMC_IOCTL_ABORT_BULK_IN:
947 retval = usbtmc_ioctl_abort_bulk_in(data);
950 mutex_unlock(&data->io_mutex);
954 static struct file_operations fops = {
955 .owner = THIS_MODULE,
957 .write = usbtmc_write,
959 .release = usbtmc_release,
960 .unlocked_ioctl = usbtmc_ioctl,
963 static struct usb_class_driver usbtmc_class = {
966 .minor_base = USBTMC_MINOR_BASE,
970 static int usbtmc_probe(struct usb_interface *intf,
971 const struct usb_device_id *id)
973 struct usbtmc_device_data *data;
974 struct usb_host_interface *iface_desc;
975 struct usb_endpoint_descriptor *endpoint;
979 dev_dbg(&intf->dev, "%s called\n", __func__);
981 data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL);
983 dev_err(&intf->dev, "Unable to allocate kernel memory\n");
989 data->usb_dev = usb_get_dev(interface_to_usbdev(intf));
990 usb_set_intfdata(intf, data);
991 kref_init(&data->kref);
992 mutex_init(&data->io_mutex);
994 /* Initialize USBTMC bTag and other fields */
996 data->TermCharEnabled = 0;
997 data->TermChar = '\n';
999 /* USBTMC devices have only one setting, so use that */
1000 iface_desc = data->intf->cur_altsetting;
1002 /* Find bulk in endpoint */
1003 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
1004 endpoint = &iface_desc->endpoint[n].desc;
1006 if (usb_endpoint_is_bulk_in(endpoint)) {
1007 data->bulk_in = endpoint->bEndpointAddress;
1008 dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n",
1014 /* Find bulk out endpoint */
1015 for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
1016 endpoint = &iface_desc->endpoint[n].desc;
1018 if (usb_endpoint_is_bulk_out(endpoint)) {
1019 data->bulk_out = endpoint->bEndpointAddress;
1020 dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n",
1026 retcode = get_capabilities(data);
1028 dev_err(&intf->dev, "can't read capabilities\n");
1030 retcode = sysfs_create_group(&intf->dev.kobj,
1031 &capability_attr_grp);
1033 retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp);
1035 retcode = usb_register_dev(intf, &usbtmc_class);
1037 dev_err(&intf->dev, "Not able to get a minor"
1038 " (base %u, slice default): %d\n", USBTMC_MINOR_BASE,
1040 goto error_register;
1042 dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor);
1047 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1048 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1049 kref_put(&data->kref, usbtmc_delete);
1053 static void usbtmc_disconnect(struct usb_interface *intf)
1055 struct usbtmc_device_data *data;
1057 dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
1059 data = usb_get_intfdata(intf);
1060 usb_deregister_dev(intf, &usbtmc_class);
1061 sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
1062 sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
1063 kref_put(&data->kref, usbtmc_delete);
1066 static struct usb_driver usbtmc_driver = {
1068 .id_table = usbtmc_devices,
1069 .probe = usbtmc_probe,
1070 .disconnect = usbtmc_disconnect
1073 static int __init usbtmc_init(void)
1077 retcode = usb_register(&usbtmc_driver);
1079 printk(KERN_ERR KBUILD_MODNAME": Unable to register driver\n");
1082 module_init(usbtmc_init);
1084 static void __exit usbtmc_exit(void)
1086 usb_deregister(&usbtmc_driver);
1088 module_exit(usbtmc_exit);
1090 MODULE_LICENSE("GPL");