2 * lirc_imon.c: LIRC/VFD/LCD driver for SoundGraph iMON IR/VFD/LCD
3 * including the iMON PAD model
5 * Copyright(C) 2004 Venky Raju(dev@venky.ws)
6 * Copyright(C) 2009 Jarod Wilson <jarod@wilsonet.com>
8 * lirc_imon is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (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 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/errno.h>
24 #include <linux/init.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/uaccess.h>
29 #include <linux/usb.h>
31 #include <media/lirc.h>
32 #include <media/lirc_dev.h>
35 #define MOD_AUTHOR "Venky Raju <dev@venky.ws>"
36 #define MOD_DESC "Driver for SoundGraph iMON MultiMedia IR/Display"
37 #define MOD_NAME "lirc_imon"
38 #define MOD_VERSION "0.8"
40 #define DISPLAY_MINOR_BASE 144
41 #define DEVICE_NAME "lcd%d"
43 #define BUF_CHUNK_SIZE 4
46 #define BIT_DURATION 250 /* each bit received is 250us */
48 /*** P R O T O T Y P E S ***/
50 /* USB Callback prototypes */
51 static int imon_probe(struct usb_interface *interface,
52 const struct usb_device_id *id);
53 static void imon_disconnect(struct usb_interface *interface);
54 static void usb_rx_callback(struct urb *urb);
55 static void usb_tx_callback(struct urb *urb);
57 /* suspend/resume support */
58 static int imon_resume(struct usb_interface *intf);
59 static int imon_suspend(struct usb_interface *intf, pm_message_t message);
61 /* Display file_operations function prototypes */
62 static int display_open(struct inode *inode, struct file *file);
63 static int display_close(struct inode *inode, struct file *file);
65 /* VFD write operation */
66 static ssize_t vfd_write(struct file *file, const char __user *buf,
67 size_t n_bytes, loff_t *pos);
69 /* LIRC driver function prototypes */
70 static int ir_open(void *data);
71 static void ir_close(void *data);
73 /* Driver init/exit prototypes */
74 static int __init imon_init(void);
75 static void __exit imon_exit(void);
77 /*** G L O B A L S ***/
78 #define IMON_DATA_BUF_SZ 35
81 struct usb_device *usbdev;
82 /* Newer devices have two interfaces */
83 int display; /* not all controllers do */
84 int display_isopen; /* display port has been opened */
85 int ir_isopen; /* IR port open */
86 int dev_present; /* USB device presence */
87 struct mutex ctx_lock; /* to lock this object */
88 wait_queue_head_t remove_ok; /* For unexpected USB disconnects */
90 int vfd_proto_6p; /* some VFD require a 6th packet */
92 struct lirc_driver *driver;
93 struct usb_endpoint_descriptor *rx_endpoint;
94 struct usb_endpoint_descriptor *tx_endpoint;
97 unsigned char usb_rx_buf[8];
98 unsigned char usb_tx_buf[8];
101 int count; /* length of 0 or 1 sequence */
102 int prev_bit; /* logic level of sequence */
103 int initial_space; /* initial space flag */
107 unsigned char data_buf[IMON_DATA_BUF_SZ]; /* user data buffer */
108 struct completion finished; /* wait for write to finish */
109 atomic_t busy; /* write in progress */
110 int status; /* status of tx completion */
114 static const struct file_operations display_fops = {
115 .owner = THIS_MODULE,
116 .open = &display_open,
118 .release = &display_close,
119 .llseek = noop_llseek,
123 * USB Device ID for iMON USB Control Boards
125 * The Windows drivers contain 6 different inf files, more or less one for
126 * each new device until the 0x0034-0x0046 devices, which all use the same
127 * driver. Some of the devices in the 34-46 range haven't been definitively
128 * identified yet. Early devices have either a TriGem Computer, Inc. or a
129 * Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later
130 * devices use the SoundGraph vendor ID (0x15c2).
132 static struct usb_device_id imon_usb_id_table[] = {
133 /* TriGem iMON (IR only) -- TG_iMON.inf */
134 { USB_DEVICE(0x0aa8, 0x8001) },
136 /* SoundGraph iMON (IR only) -- sg_imon.inf */
137 { USB_DEVICE(0x04e8, 0xff30) },
139 /* SoundGraph iMON VFD (IR & VFD) -- iMON_VFD.inf */
140 { USB_DEVICE(0x0aa8, 0xffda) },
142 /* SoundGraph iMON SS (IR & VFD) -- iMON_SS.inf */
143 { USB_DEVICE(0x15c2, 0xffda) },
148 /* Some iMON VFD models requires a 6th packet for VFD writes */
149 static struct usb_device_id vfd_proto_6p_list[] = {
150 { USB_DEVICE(0x15c2, 0xffda) },
154 /* Some iMON devices have no lcd/vfd, don't set one up */
155 static struct usb_device_id ir_only_list[] = {
156 { USB_DEVICE(0x0aa8, 0x8001) },
157 { USB_DEVICE(0x04e8, 0xff30) },
161 /* USB Device data */
162 static struct usb_driver imon_driver = {
165 .disconnect = imon_disconnect,
166 .suspend = imon_suspend,
167 .resume = imon_resume,
168 .id_table = imon_usb_id_table,
171 static struct usb_class_driver imon_class = {
173 .fops = &display_fops,
174 .minor_base = DISPLAY_MINOR_BASE,
177 /* to prevent races between open() and disconnect(), probing, etc */
178 static DEFINE_MUTEX(driver_lock);
182 /*** M O D U L E C O D E ***/
184 MODULE_AUTHOR(MOD_AUTHOR);
185 MODULE_DESCRIPTION(MOD_DESC);
186 MODULE_VERSION(MOD_VERSION);
187 MODULE_LICENSE("GPL");
188 MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
189 module_param(debug, int, S_IRUGO | S_IWUSR);
190 MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes(default: no)");
192 static void free_imon_context(struct imon_context *context)
194 struct device *dev = context->driver->dev;
195 usb_free_urb(context->tx_urb);
196 usb_free_urb(context->rx_urb);
197 lirc_buffer_free(context->driver->rbuf);
198 kfree(context->driver->rbuf);
199 kfree(context->driver);
202 dev_dbg(dev, "%s: iMON context freed\n", __func__);
205 static void deregister_from_lirc(struct imon_context *context)
208 int minor = context->driver->minor;
210 retval = lirc_unregister_driver(minor);
212 printk(KERN_ERR KBUILD_MODNAME
213 ": %s: unable to deregister from lirc(%d)",
216 printk(KERN_INFO MOD_NAME ": Deregistered iMON driver "
217 "(minor:%d)\n", minor);
222 * Called when the Display device (e.g. /dev/lcd0)
223 * is opened by the application.
225 static int display_open(struct inode *inode, struct file *file)
227 struct usb_interface *interface;
228 struct imon_context *context = NULL;
232 /* prevent races with disconnect */
233 mutex_lock(&driver_lock);
235 subminor = iminor(inode);
236 interface = usb_find_interface(&imon_driver, subminor);
238 printk(KERN_ERR KBUILD_MODNAME
239 ": %s: could not find interface for minor %d\n",
244 context = usb_get_intfdata(interface);
247 dev_err(&interface->dev,
248 "%s: no context found for minor %d\n",
254 mutex_lock(&context->ctx_lock);
256 if (!context->display) {
257 dev_err(&interface->dev,
258 "%s: display not supported by device\n", __func__);
260 } else if (context->display_isopen) {
261 dev_err(&interface->dev,
262 "%s: display port is already open\n", __func__);
265 context->display_isopen = 1;
266 file->private_data = context;
267 dev_info(context->driver->dev, "display port opened\n");
270 mutex_unlock(&context->ctx_lock);
273 mutex_unlock(&driver_lock);
278 * Called when the display device (e.g. /dev/lcd0)
279 * is closed by the application.
281 static int display_close(struct inode *inode, struct file *file)
283 struct imon_context *context = NULL;
286 context = file->private_data;
289 printk(KERN_ERR KBUILD_MODNAME
290 "%s: no context for device\n", __func__);
294 mutex_lock(&context->ctx_lock);
296 if (!context->display) {
297 dev_err(&context->usbdev->dev,
298 "%s: display not supported by device\n", __func__);
300 } else if (!context->display_isopen) {
301 dev_err(&context->usbdev->dev,
302 "%s: display is not open\n", __func__);
305 context->display_isopen = 0;
306 dev_info(context->driver->dev, "display port closed\n");
307 if (!context->dev_present && !context->ir_isopen) {
309 * Device disconnected before close and IR port is not
310 * open. If IR port is open, context will be deleted by
313 mutex_unlock(&context->ctx_lock);
314 free_imon_context(context);
319 mutex_unlock(&context->ctx_lock);
324 * Sends a packet to the device -- this function must be called
325 * with context->ctx_lock held.
327 static int send_packet(struct imon_context *context)
333 /* Check if we need to use control or interrupt urb */
334 pipe = usb_sndintpipe(context->usbdev,
335 context->tx_endpoint->bEndpointAddress);
336 interval = context->tx_endpoint->bInterval;
338 usb_fill_int_urb(context->tx_urb, context->usbdev, pipe,
340 sizeof(context->usb_tx_buf),
341 usb_tx_callback, context, interval);
343 context->tx_urb->actual_length = 0;
345 init_completion(&context->tx.finished);
346 atomic_set(&(context->tx.busy), 1);
348 retval = usb_submit_urb(context->tx_urb, GFP_KERNEL);
350 atomic_set(&(context->tx.busy), 0);
351 dev_err(&context->usbdev->dev,
352 "%s: error submitting urb(%d)\n", __func__, retval);
354 /* Wait for transmission to complete (or abort) */
355 mutex_unlock(&context->ctx_lock);
356 retval = wait_for_completion_interruptible(
357 &context->tx.finished);
359 dev_err(&context->usbdev->dev,
360 "%s: task interrupted\n", __func__);
361 mutex_lock(&context->ctx_lock);
363 retval = context->tx.status;
365 dev_err(&context->usbdev->dev,
366 "%s: packet tx failed (%d)\n",
374 * Writes data to the VFD. The iMON VFD is 2x16 characters
375 * and requires data in 5 consecutive USB interrupt packets,
376 * each packet but the last carrying 7 bytes.
378 * I don't know if the VFD board supports features such as
379 * scrolling, clearing rows, blanking, etc. so at
380 * the caller must provide a full screen of data. If fewer
381 * than 32 bytes are provided spaces will be appended to
382 * generate a full screen.
384 static ssize_t vfd_write(struct file *file, const char __user *buf,
385 size_t n_bytes, loff_t *pos)
391 struct imon_context *context;
392 const unsigned char vfd_packet6[] = {
393 0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
394 int *data_buf = NULL;
396 context = file->private_data;
398 printk(KERN_ERR KBUILD_MODNAME
399 "%s: no context for device\n", __func__);
403 mutex_lock(&context->ctx_lock);
405 if (!context->dev_present) {
406 dev_err(&context->usbdev->dev,
407 "%s: no iMON device present\n", __func__);
412 if (n_bytes <= 0 || n_bytes > IMON_DATA_BUF_SZ - 3) {
413 dev_err(&context->usbdev->dev,
414 "%s: invalid payload size\n", __func__);
419 data_buf = memdup_user(buf, n_bytes);
420 if (IS_ERR(data_buf)) {
421 retval = PTR_ERR(data_buf);
425 memcpy(context->tx.data_buf, data_buf, n_bytes);
427 /* Pad with spaces */
428 for (i = n_bytes; i < IMON_DATA_BUF_SZ - 3; ++i)
429 context->tx.data_buf[i] = ' ';
431 for (i = IMON_DATA_BUF_SZ - 3; i < IMON_DATA_BUF_SZ; ++i)
432 context->tx.data_buf[i] = 0xFF;
438 memcpy(context->usb_tx_buf, context->tx.data_buf + offset, 7);
439 context->usb_tx_buf[7] = (unsigned char) seq;
441 retval = send_packet(context);
443 dev_err(&context->usbdev->dev,
444 "%s: send packet failed for packet #%d\n",
452 } while (offset < IMON_DATA_BUF_SZ);
454 if (context->vfd_proto_6p) {
456 memcpy(context->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
457 context->usb_tx_buf[7] = (unsigned char) seq;
458 retval = send_packet(context);
460 dev_err(&context->usbdev->dev,
461 "%s: send packet failed for packet #%d\n",
466 mutex_unlock(&context->ctx_lock);
469 return (!retval) ? n_bytes : retval;
473 * Callback function for USB core API: transmit data
475 static void usb_tx_callback(struct urb *urb)
477 struct imon_context *context;
481 context = (struct imon_context *)urb->context;
485 context->tx.status = urb->status;
487 /* notify waiters that write has finished */
488 atomic_set(&context->tx.busy, 0);
489 complete(&context->tx.finished);
495 * Called by lirc_dev when the application opens /dev/lirc
497 static int ir_open(void *data)
500 struct imon_context *context;
502 /* prevent races with disconnect */
503 mutex_lock(&driver_lock);
505 context = (struct imon_context *)data;
507 /* initial IR protocol decode variables */
508 context->rx.count = 0;
509 context->rx.initial_space = 1;
510 context->rx.prev_bit = 0;
512 context->ir_isopen = 1;
513 dev_info(context->driver->dev, "IR port opened\n");
515 mutex_unlock(&driver_lock);
520 * Called by lirc_dev when the application closes /dev/lirc
522 static void ir_close(void *data)
524 struct imon_context *context;
526 context = (struct imon_context *)data;
528 printk(KERN_ERR KBUILD_MODNAME
529 "%s: no context for device\n", __func__);
533 mutex_lock(&context->ctx_lock);
535 context->ir_isopen = 0;
536 dev_info(context->driver->dev, "IR port closed\n");
538 if (!context->dev_present) {
540 * Device disconnected while IR port was still open. Driver
541 * was not deregistered at disconnect time, so do it now.
543 deregister_from_lirc(context);
545 if (!context->display_isopen) {
546 mutex_unlock(&context->ctx_lock);
547 free_imon_context(context);
551 * If display port is open, context will be deleted by
556 mutex_unlock(&context->ctx_lock);
561 * Convert bit count to time duration (in us) and submit
562 * the value to lirc_dev.
564 static void submit_data(struct imon_context *context)
566 unsigned char buf[4];
567 int value = context->rx.count;
570 dev_dbg(context->driver->dev, "submitting data to LIRC\n");
572 value *= BIT_DURATION;
574 if (context->rx.prev_bit)
577 for (i = 0; i < 4; ++i)
578 buf[i] = value>>(i*8);
580 lirc_buffer_write(context->driver->rbuf, buf);
581 wake_up(&context->driver->rbuf->wait_poll);
585 static inline int tv2int(const struct timeval *a, const struct timeval *b)
590 if (b->tv_usec > a->tv_usec) {
595 usecs += a->tv_usec - b->tv_usec;
597 sec += a->tv_sec - b->tv_sec;
609 * Process the incoming packet
611 static void imon_incoming_packet(struct imon_context *context,
612 struct urb *urb, int intf)
614 int len = urb->actual_length;
615 unsigned char *buf = urb->transfer_buffer;
616 struct device *dev = context->driver->dev;
622 * just bail out if no listening IR client
624 if (!context->ir_isopen)
628 dev_warn(dev, "imon %s: invalid incoming packet "
629 "size (len = %d, intf%d)\n", __func__, len, intf);
634 printk(KERN_INFO "raw packet: ");
635 for (i = 0; i < len; ++i)
636 printk("%02x ", buf[i]);
641 * Translate received data to pulse and space lengths.
642 * Received data is active low, i.e. pulses are 0 and
645 * My original algorithm was essentially similar to
646 * Changwoo Ryu's with the exception that he switched
647 * the incoming bits to active high and also fed an
648 * initial space to LIRC at the start of a new sequence
649 * if the previous bit was a pulse.
651 * I've decided to adopt his algorithm.
654 if (buf[7] == 1 && context->rx.initial_space) {
655 /* LIRC requires a leading space */
656 context->rx.prev_bit = 0;
657 context->rx.count = 4;
658 submit_data(context);
659 context->rx.count = 0;
662 for (octet = 0; octet < 5; ++octet) {
664 for (bit = 0; bit < 8; ++bit) {
665 int curr_bit = !(buf[octet] & mask);
666 if (curr_bit != context->rx.prev_bit) {
667 if (context->rx.count) {
668 submit_data(context);
669 context->rx.count = 0;
671 context->rx.prev_bit = curr_bit;
679 if (context->rx.count) {
680 submit_data(context);
681 context->rx.count = 0;
683 context->rx.initial_space = context->rx.prev_bit;
688 * Callback function for USB core API: receive data
690 static void usb_rx_callback(struct urb *urb)
692 struct imon_context *context;
698 context = (struct imon_context *)urb->context;
702 switch (urb->status) {
703 case -ENOENT: /* usbcore unlink successful! */
707 imon_incoming_packet(context, urb, intfnum);
711 dev_warn(context->driver->dev, "imon %s: status(%d): ignored\n",
712 __func__, urb->status);
716 usb_submit_urb(context->rx_urb, GFP_ATOMIC);
722 * Callback function for USB core API: Probe
724 static int imon_probe(struct usb_interface *interface,
725 const struct usb_device_id *id)
727 struct usb_device *usbdev = NULL;
728 struct usb_host_interface *iface_desc = NULL;
729 struct usb_endpoint_descriptor *rx_endpoint = NULL;
730 struct usb_endpoint_descriptor *tx_endpoint = NULL;
731 struct urb *rx_urb = NULL;
732 struct urb *tx_urb = NULL;
733 struct lirc_driver *driver = NULL;
734 struct lirc_buffer *rbuf = NULL;
735 struct device *dev = &interface->dev;
740 int display_ep_found = 0;
742 int alloc_status = 0;
743 int vfd_proto_6p = 0;
744 struct imon_context *context = NULL;
748 /* prevent races probing devices w/multiple interfaces */
749 mutex_lock(&driver_lock);
751 context = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
753 dev_err(dev, "%s: kzalloc failed for context\n", __func__);
755 goto alloc_status_switch;
759 * Try to auto-detect the type of display if the user hasn't set
760 * it by hand via the display_type modparam. Default is VFD.
762 if (usb_match_id(interface, ir_only_list))
763 context->display = 0;
765 context->display = 1;
767 usbdev = usb_get_dev(interface_to_usbdev(interface));
768 iface_desc = interface->cur_altsetting;
769 num_endpts = iface_desc->desc.bNumEndpoints;
770 ifnum = iface_desc->desc.bInterfaceNumber;
771 vendor = le16_to_cpu(usbdev->descriptor.idVendor);
772 product = le16_to_cpu(usbdev->descriptor.idProduct);
774 dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
775 __func__, vendor, product, ifnum);
778 * Scan the endpoint list and set:
779 * first input endpoint = IR endpoint
780 * first output endpoint = display endpoint
782 for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
783 struct usb_endpoint_descriptor *ep;
786 ep = &iface_desc->endpoint[i].desc;
787 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
788 ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
791 ep_dir == USB_DIR_IN &&
792 ep_type == USB_ENDPOINT_XFER_INT) {
796 dev_dbg(dev, "%s: found IR endpoint\n", __func__);
798 } else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
799 ep_type == USB_ENDPOINT_XFER_INT) {
801 display_ep_found = 1;
802 dev_dbg(dev, "%s: found display endpoint\n", __func__);
807 * Some iMON receivers have no display. Unfortunately, it seems
808 * that SoundGraph recycles device IDs between devices both with
811 if (context->display == 0) {
812 display_ep_found = 0;
813 dev_dbg(dev, "%s: device has no display\n", __func__);
816 /* Input endpoint is mandatory */
818 dev_err(dev, "%s: no valid input (IR) endpoint found.\n", __func__);
821 goto alloc_status_switch;
824 /* Determine if display requires 6 packets */
825 if (display_ep_found) {
826 if (usb_match_id(interface, vfd_proto_6p_list))
829 dev_dbg(dev, "%s: vfd_proto_6p: %d\n",
830 __func__, vfd_proto_6p);
833 driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
835 dev_err(dev, "%s: kzalloc failed for lirc_driver\n", __func__);
837 goto alloc_status_switch;
839 rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
841 dev_err(dev, "%s: kmalloc failed for lirc_buffer\n", __func__);
843 goto alloc_status_switch;
845 if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
846 dev_err(dev, "%s: lirc_buffer_init failed\n", __func__);
848 goto alloc_status_switch;
850 rx_urb = usb_alloc_urb(0, GFP_KERNEL);
852 dev_err(dev, "%s: usb_alloc_urb failed for IR urb\n", __func__);
854 goto alloc_status_switch;
856 tx_urb = usb_alloc_urb(0, GFP_KERNEL);
858 dev_err(dev, "%s: usb_alloc_urb failed for display urb\n",
861 goto alloc_status_switch;
864 mutex_init(&context->ctx_lock);
865 context->vfd_proto_6p = vfd_proto_6p;
867 strcpy(driver->name, MOD_NAME);
869 driver->code_length = BUF_CHUNK_SIZE * 8;
870 driver->sample_rate = 0;
871 driver->features = LIRC_CAN_REC_MODE2;
872 driver->data = context;
874 driver->set_use_inc = ir_open;
875 driver->set_use_dec = ir_close;
876 driver->dev = &interface->dev;
877 driver->owner = THIS_MODULE;
879 mutex_lock(&context->ctx_lock);
881 context->driver = driver;
882 /* start out in keyboard mode */
884 lirc_minor = lirc_register_driver(driver);
885 if (lirc_minor < 0) {
886 dev_err(dev, "%s: lirc_register_driver failed\n", __func__);
890 dev_info(dev, "Registered iMON driver "
891 "(lirc minor: %d)\n", lirc_minor);
893 /* Needed while unregistering! */
894 driver->minor = lirc_minor;
896 context->usbdev = usbdev;
897 context->dev_present = 1;
898 context->rx_endpoint = rx_endpoint;
899 context->rx_urb = rx_urb;
902 * tx is used to send characters to lcd/vfd, associate RF
903 * remotes, set IR protocol, and maybe more...
905 context->tx_endpoint = tx_endpoint;
906 context->tx_urb = tx_urb;
908 if (display_ep_found)
909 context->display = 1;
911 usb_fill_int_urb(context->rx_urb, context->usbdev,
912 usb_rcvintpipe(context->usbdev,
913 context->rx_endpoint->bEndpointAddress),
914 context->usb_rx_buf, sizeof(context->usb_rx_buf),
915 usb_rx_callback, context,
916 context->rx_endpoint->bInterval);
918 retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
921 dev_err(dev, "%s: usb_submit_urb failed for intf0 (%d)\n",
923 mutex_unlock(&context->ctx_lock);
927 usb_set_intfdata(interface, context);
929 if (context->display && ifnum == 0) {
930 dev_dbg(dev, "%s: Registering iMON display with sysfs\n",
933 if (usb_register_dev(interface, &imon_class)) {
934 /* Not a fatal error, so ignore */
935 dev_info(dev, "%s: could not get a minor number for "
936 "display\n", __func__);
940 dev_info(dev, "iMON device (%04x:%04x, intf%d) on "
941 "usb<%d:%d> initialized\n", vendor, product, ifnum,
942 usbdev->bus->busnum, usbdev->devnum);
945 mutex_unlock(&context->ctx_lock);
948 switch (alloc_status) {
950 usb_free_urb(tx_urb);
952 usb_free_urb(rx_urb);
955 lirc_buffer_free(rbuf);
964 if (retval != -ENODEV)
972 mutex_unlock(&driver_lock);
978 * Callback function for USB core API: disconnect
980 static void imon_disconnect(struct usb_interface *interface)
982 struct imon_context *context;
985 /* prevent races with ir_open()/display_open() */
986 mutex_lock(&driver_lock);
988 context = usb_get_intfdata(interface);
989 ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
991 mutex_lock(&context->ctx_lock);
993 usb_set_intfdata(interface, NULL);
995 /* Abort ongoing write */
996 if (atomic_read(&context->tx.busy)) {
997 usb_kill_urb(context->tx_urb);
998 complete_all(&context->tx.finished);
1001 context->dev_present = 0;
1002 usb_kill_urb(context->rx_urb);
1003 if (context->display)
1004 usb_deregister_dev(interface, &imon_class);
1006 if (!context->ir_isopen && !context->dev_present) {
1007 deregister_from_lirc(context);
1008 mutex_unlock(&context->ctx_lock);
1009 if (!context->display_isopen)
1010 free_imon_context(context);
1012 mutex_unlock(&context->ctx_lock);
1014 mutex_unlock(&driver_lock);
1016 printk(KERN_INFO "%s: iMON device (intf%d) disconnected\n",
1020 static int imon_suspend(struct usb_interface *intf, pm_message_t message)
1022 struct imon_context *context = usb_get_intfdata(intf);
1024 usb_kill_urb(context->rx_urb);
1029 static int imon_resume(struct usb_interface *intf)
1032 struct imon_context *context = usb_get_intfdata(intf);
1034 usb_fill_int_urb(context->rx_urb, context->usbdev,
1035 usb_rcvintpipe(context->usbdev,
1036 context->rx_endpoint->bEndpointAddress),
1037 context->usb_rx_buf, sizeof(context->usb_rx_buf),
1038 usb_rx_callback, context,
1039 context->rx_endpoint->bInterval);
1041 rc = usb_submit_urb(context->rx_urb, GFP_ATOMIC);
1046 module_usb_driver(imon_driver);