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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25 #include <linux/errno.h>
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/slab.h>
29 #include <linux/uaccess.h>
30 #include <linux/usb.h>
32 #include <media/lirc.h>
33 #include <media/lirc_dev.h>
36 #define MOD_AUTHOR "Venky Raju <dev@venky.ws>"
37 #define MOD_DESC "Driver for SoundGraph iMON MultiMedia IR/Display"
38 #define MOD_NAME "lirc_imon"
39 #define MOD_VERSION "0.8"
41 #define DISPLAY_MINOR_BASE 144
42 #define DEVICE_NAME "lcd%d"
44 #define BUF_CHUNK_SIZE 4
47 #define BIT_DURATION 250 /* each bit received is 250us */
49 /*** P R O T O T Y P E S ***/
51 /* USB Callback prototypes */
52 static int imon_probe(struct usb_interface *interface,
53 const struct usb_device_id *id);
54 static void imon_disconnect(struct usb_interface *interface);
55 static void usb_rx_callback(struct urb *urb);
56 static void usb_tx_callback(struct urb *urb);
58 /* suspend/resume support */
59 static int imon_resume(struct usb_interface *intf);
60 static int imon_suspend(struct usb_interface *intf, pm_message_t message);
62 /* Display file_operations function prototypes */
63 static int display_open(struct inode *inode, struct file *file);
64 static int display_close(struct inode *inode, struct file *file);
66 /* VFD write operation */
67 static ssize_t vfd_write(struct file *file, const char __user *buf,
68 size_t n_bytes, loff_t *pos);
70 /* LIRC driver function prototypes */
71 static int ir_open(void *data);
72 static void ir_close(void *data);
74 /*** G L O B A L S ***/
75 #define IMON_DATA_BUF_SZ 35
78 struct usb_device *usbdev;
79 /* Newer devices have two interfaces */
80 int display; /* not all controllers do */
81 int display_isopen; /* display port has been opened */
82 int ir_isopen; /* IR port open */
83 int dev_present; /* USB device presence */
84 struct mutex ctx_lock; /* to lock this object */
85 wait_queue_head_t remove_ok; /* For unexpected USB disconnects */
87 int vfd_proto_6p; /* some VFD require a 6th packet */
89 struct lirc_driver *driver;
90 struct usb_endpoint_descriptor *rx_endpoint;
91 struct usb_endpoint_descriptor *tx_endpoint;
94 unsigned char usb_rx_buf[8];
95 unsigned char usb_tx_buf[8];
98 int count; /* length of 0 or 1 sequence */
99 int prev_bit; /* logic level of sequence */
100 int initial_space; /* initial space flag */
104 unsigned char data_buf[IMON_DATA_BUF_SZ]; /* user data buffer */
105 struct completion finished; /* wait for write to finish */
106 atomic_t busy; /* write in progress */
107 int status; /* status of tx completion */
111 static const struct file_operations display_fops = {
112 .owner = THIS_MODULE,
113 .open = &display_open,
115 .release = &display_close,
116 .llseek = noop_llseek,
120 * USB Device ID for iMON USB Control Boards
122 * The Windows drivers contain 6 different inf files, more or less one for
123 * each new device until the 0x0034-0x0046 devices, which all use the same
124 * driver. Some of the devices in the 34-46 range haven't been definitively
125 * identified yet. Early devices have either a TriGem Computer, Inc. or a
126 * Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later
127 * devices use the SoundGraph vendor ID (0x15c2).
129 static struct usb_device_id imon_usb_id_table[] = {
130 /* TriGem iMON (IR only) -- TG_iMON.inf */
131 { USB_DEVICE(0x0aa8, 0x8001) },
133 /* SoundGraph iMON (IR only) -- sg_imon.inf */
134 { USB_DEVICE(0x04e8, 0xff30) },
136 /* SoundGraph iMON VFD (IR & VFD) -- iMON_VFD.inf */
137 { USB_DEVICE(0x0aa8, 0xffda) },
139 /* SoundGraph iMON SS (IR & VFD) -- iMON_SS.inf */
140 { USB_DEVICE(0x15c2, 0xffda) },
145 /* Some iMON VFD models requires a 6th packet for VFD writes */
146 static struct usb_device_id vfd_proto_6p_list[] = {
147 { USB_DEVICE(0x15c2, 0xffda) },
151 /* Some iMON devices have no lcd/vfd, don't set one up */
152 static struct usb_device_id ir_only_list[] = {
153 { USB_DEVICE(0x0aa8, 0x8001) },
154 { USB_DEVICE(0x04e8, 0xff30) },
158 /* USB Device data */
159 static struct usb_driver imon_driver = {
162 .disconnect = imon_disconnect,
163 .suspend = imon_suspend,
164 .resume = imon_resume,
165 .id_table = imon_usb_id_table,
168 static struct usb_class_driver imon_class = {
170 .fops = &display_fops,
171 .minor_base = DISPLAY_MINOR_BASE,
174 /* to prevent races between open() and disconnect(), probing, etc */
175 static DEFINE_MUTEX(driver_lock);
179 /*** M O D U L E C O D E ***/
181 MODULE_AUTHOR(MOD_AUTHOR);
182 MODULE_DESCRIPTION(MOD_DESC);
183 MODULE_VERSION(MOD_VERSION);
184 MODULE_LICENSE("GPL");
185 MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
186 module_param(debug, int, S_IRUGO | S_IWUSR);
187 MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes(default: no)");
189 static void free_imon_context(struct imon_context *context)
191 struct device *dev = context->driver->dev;
193 usb_free_urb(context->tx_urb);
194 usb_free_urb(context->rx_urb);
195 lirc_buffer_free(context->driver->rbuf);
196 kfree(context->driver->rbuf);
197 kfree(context->driver);
200 dev_dbg(dev, "%s: iMON context freed\n", __func__);
203 static void deregister_from_lirc(struct imon_context *context)
206 int minor = context->driver->minor;
208 retval = lirc_unregister_driver(minor);
210 dev_err(&context->usbdev->dev,
211 ": %s: unable to deregister from lirc(%d)",
214 dev_info(&context->usbdev->dev,
215 "Deregistered iMON driver (minor:%d)\n", minor);
220 * Called when the Display device (e.g. /dev/lcd0)
221 * is opened by the application.
223 static int display_open(struct inode *inode, struct file *file)
225 struct usb_interface *interface;
226 struct imon_context *context = NULL;
230 /* prevent races with disconnect */
231 mutex_lock(&driver_lock);
233 subminor = iminor(inode);
234 interface = usb_find_interface(&imon_driver, subminor);
236 pr_err("%s: could not find interface for minor %d\n",
241 context = usb_get_intfdata(interface);
244 dev_err(&interface->dev,
245 "%s: no context found for minor %d\n",
251 mutex_lock(&context->ctx_lock);
253 if (!context->display) {
254 dev_err(&interface->dev,
255 "%s: display not supported by device\n", __func__);
257 } else if (context->display_isopen) {
258 dev_err(&interface->dev,
259 "%s: display port is already open\n", __func__);
262 context->display_isopen = 1;
263 file->private_data = context;
264 dev_info(context->driver->dev, "display port opened\n");
267 mutex_unlock(&context->ctx_lock);
270 mutex_unlock(&driver_lock);
275 * Called when the display device (e.g. /dev/lcd0)
276 * is closed by the application.
278 static int display_close(struct inode *inode, struct file *file)
280 struct imon_context *context = NULL;
283 context = file->private_data;
286 pr_err("%s: no context for device\n", __func__);
290 mutex_lock(&context->ctx_lock);
292 if (!context->display) {
293 dev_err(&context->usbdev->dev,
294 "%s: display not supported by device\n", __func__);
296 } else if (!context->display_isopen) {
297 dev_err(&context->usbdev->dev,
298 "%s: display is not open\n", __func__);
301 context->display_isopen = 0;
302 dev_info(context->driver->dev, "display port closed\n");
303 if (!context->dev_present && !context->ir_isopen) {
305 * Device disconnected before close and IR port is not
306 * open. If IR port is open, context will be deleted by
309 mutex_unlock(&context->ctx_lock);
310 free_imon_context(context);
315 mutex_unlock(&context->ctx_lock);
320 * Sends a packet to the device -- this function must be called
321 * with context->ctx_lock held.
323 static int send_packet(struct imon_context *context)
329 /* Check if we need to use control or interrupt urb */
330 pipe = usb_sndintpipe(context->usbdev,
331 context->tx_endpoint->bEndpointAddress);
332 interval = context->tx_endpoint->bInterval;
334 usb_fill_int_urb(context->tx_urb, context->usbdev, pipe,
336 sizeof(context->usb_tx_buf),
337 usb_tx_callback, context, interval);
339 context->tx_urb->actual_length = 0;
341 init_completion(&context->tx.finished);
342 atomic_set(&(context->tx.busy), 1);
344 retval = usb_submit_urb(context->tx_urb, GFP_KERNEL);
346 atomic_set(&(context->tx.busy), 0);
347 dev_err(&context->usbdev->dev,
348 "%s: error submitting urb(%d)\n", __func__, retval);
350 /* Wait for transmission to complete (or abort) */
351 mutex_unlock(&context->ctx_lock);
352 retval = wait_for_completion_interruptible(
353 &context->tx.finished);
355 dev_err(&context->usbdev->dev,
356 "%s: task interrupted\n", __func__);
357 mutex_lock(&context->ctx_lock);
359 retval = context->tx.status;
361 dev_err(&context->usbdev->dev,
362 "%s: packet tx failed (%d)\n",
370 * Writes data to the VFD. The iMON VFD is 2x16 characters
371 * and requires data in 5 consecutive USB interrupt packets,
372 * each packet but the last carrying 7 bytes.
374 * I don't know if the VFD board supports features such as
375 * scrolling, clearing rows, blanking, etc. so at
376 * the caller must provide a full screen of data. If fewer
377 * than 32 bytes are provided spaces will be appended to
378 * generate a full screen.
380 static ssize_t vfd_write(struct file *file, const char __user *buf,
381 size_t n_bytes, loff_t *pos)
387 struct imon_context *context;
388 const unsigned char vfd_packet6[] = {
389 0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
390 int *data_buf = NULL;
392 context = file->private_data;
394 pr_err("%s: no context for device\n", __func__);
398 mutex_lock(&context->ctx_lock);
400 if (!context->dev_present) {
401 dev_err(&context->usbdev->dev,
402 "%s: no iMON device present\n", __func__);
407 if (n_bytes <= 0 || n_bytes > IMON_DATA_BUF_SZ - 3) {
408 dev_err(&context->usbdev->dev,
409 "%s: invalid payload size\n", __func__);
414 data_buf = memdup_user(buf, n_bytes);
415 if (IS_ERR(data_buf)) {
416 retval = PTR_ERR(data_buf);
421 memcpy(context->tx.data_buf, data_buf, n_bytes);
423 /* Pad with spaces */
424 for (i = n_bytes; i < IMON_DATA_BUF_SZ - 3; ++i)
425 context->tx.data_buf[i] = ' ';
427 for (i = IMON_DATA_BUF_SZ - 3; i < IMON_DATA_BUF_SZ; ++i)
428 context->tx.data_buf[i] = 0xFF;
434 memcpy(context->usb_tx_buf, context->tx.data_buf + offset, 7);
435 context->usb_tx_buf[7] = (unsigned char) seq;
437 retval = send_packet(context);
439 dev_err(&context->usbdev->dev,
440 "%s: send packet failed for packet #%d\n",
448 } while (offset < IMON_DATA_BUF_SZ);
450 if (context->vfd_proto_6p) {
452 memcpy(context->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
453 context->usb_tx_buf[7] = (unsigned char) seq;
454 retval = send_packet(context);
456 dev_err(&context->usbdev->dev,
457 "%s: send packet failed for packet #%d\n",
462 mutex_unlock(&context->ctx_lock);
465 return (!retval) ? n_bytes : retval;
469 * Callback function for USB core API: transmit data
471 static void usb_tx_callback(struct urb *urb)
473 struct imon_context *context;
477 context = (struct imon_context *)urb->context;
481 context->tx.status = urb->status;
483 /* notify waiters that write has finished */
484 atomic_set(&context->tx.busy, 0);
485 complete(&context->tx.finished);
489 * Called by lirc_dev when the application opens /dev/lirc
491 static int ir_open(void *data)
493 struct imon_context *context;
495 /* prevent races with disconnect */
496 mutex_lock(&driver_lock);
498 context = (struct imon_context *)data;
500 /* initial IR protocol decode variables */
501 context->rx.count = 0;
502 context->rx.initial_space = 1;
503 context->rx.prev_bit = 0;
505 context->ir_isopen = 1;
506 dev_info(context->driver->dev, "IR port opened\n");
508 mutex_unlock(&driver_lock);
513 * Called by lirc_dev when the application closes /dev/lirc
515 static void ir_close(void *data)
517 struct imon_context *context;
519 context = (struct imon_context *)data;
521 pr_err("%s: no context for device\n", __func__);
525 mutex_lock(&context->ctx_lock);
527 context->ir_isopen = 0;
528 dev_info(context->driver->dev, "IR port closed\n");
530 if (!context->dev_present) {
532 * Device disconnected while IR port was still open. Driver
533 * was not deregistered at disconnect time, so do it now.
535 deregister_from_lirc(context);
537 if (!context->display_isopen) {
538 mutex_unlock(&context->ctx_lock);
539 free_imon_context(context);
543 * If display port is open, context will be deleted by
548 mutex_unlock(&context->ctx_lock);
552 * Convert bit count to time duration (in us) and submit
553 * the value to lirc_dev.
555 static void submit_data(struct imon_context *context)
557 unsigned char buf[4];
558 int value = context->rx.count;
561 dev_dbg(context->driver->dev, "submitting data to LIRC\n");
563 value *= BIT_DURATION;
565 if (context->rx.prev_bit)
568 for (i = 0; i < 4; ++i)
569 buf[i] = value>>(i*8);
571 lirc_buffer_write(context->driver->rbuf, buf);
572 wake_up(&context->driver->rbuf->wait_poll);
575 static inline int tv2int(const struct timeval *a, const struct timeval *b)
580 if (b->tv_usec > a->tv_usec) {
585 usecs += a->tv_usec - b->tv_usec;
587 sec += a->tv_sec - b->tv_sec;
599 * Process the incoming packet
601 static void imon_incoming_packet(struct imon_context *context,
602 struct urb *urb, int intf)
604 int len = urb->actual_length;
605 unsigned char *buf = urb->transfer_buffer;
606 struct device *dev = context->driver->dev;
612 * just bail out if no listening IR client
614 if (!context->ir_isopen)
618 dev_warn(dev, "imon %s: invalid incoming packet size (len = %d, intf%d)\n",
619 __func__, len, intf);
624 dev_info(dev, "raw packet: ");
625 for (i = 0; i < len; ++i)
626 printk("%02x ", buf[i]);
631 * Translate received data to pulse and space lengths.
632 * Received data is active low, i.e. pulses are 0 and
635 * My original algorithm was essentially similar to
636 * Changwoo Ryu's with the exception that he switched
637 * the incoming bits to active high and also fed an
638 * initial space to LIRC at the start of a new sequence
639 * if the previous bit was a pulse.
641 * I've decided to adopt his algorithm.
644 if (buf[7] == 1 && context->rx.initial_space) {
645 /* LIRC requires a leading space */
646 context->rx.prev_bit = 0;
647 context->rx.count = 4;
648 submit_data(context);
649 context->rx.count = 0;
652 for (octet = 0; octet < 5; ++octet) {
654 for (bit = 0; bit < 8; ++bit) {
655 int curr_bit = !(buf[octet] & mask);
657 if (curr_bit != context->rx.prev_bit) {
658 if (context->rx.count) {
659 submit_data(context);
660 context->rx.count = 0;
662 context->rx.prev_bit = curr_bit;
670 if (context->rx.count) {
671 submit_data(context);
672 context->rx.count = 0;
674 context->rx.initial_space = context->rx.prev_bit;
679 * Callback function for USB core API: receive data
681 static void usb_rx_callback(struct urb *urb)
683 struct imon_context *context;
689 context = (struct imon_context *)urb->context;
693 switch (urb->status) {
694 case -ENOENT: /* usbcore unlink successful! */
698 imon_incoming_packet(context, urb, intfnum);
702 dev_warn(context->driver->dev, "imon %s: status(%d): ignored\n",
703 __func__, urb->status);
707 usb_submit_urb(context->rx_urb, GFP_ATOMIC);
711 * Callback function for USB core API: Probe
713 static int imon_probe(struct usb_interface *interface,
714 const struct usb_device_id *id)
716 struct usb_device *usbdev = NULL;
717 struct usb_host_interface *iface_desc = NULL;
718 struct usb_endpoint_descriptor *rx_endpoint = NULL;
719 struct usb_endpoint_descriptor *tx_endpoint = NULL;
720 struct urb *rx_urb = NULL;
721 struct urb *tx_urb = NULL;
722 struct lirc_driver *driver = NULL;
723 struct lirc_buffer *rbuf = NULL;
724 struct device *dev = &interface->dev;
729 int display_ep_found = 0;
731 int alloc_status = 0;
732 int vfd_proto_6p = 0;
733 struct imon_context *context = NULL;
737 /* prevent races probing devices w/multiple interfaces */
738 mutex_lock(&driver_lock);
740 context = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
743 goto alloc_status_switch;
747 * Try to auto-detect the type of display if the user hasn't set
748 * it by hand via the display_type modparam. Default is VFD.
750 if (usb_match_id(interface, ir_only_list))
751 context->display = 0;
753 context->display = 1;
755 usbdev = usb_get_dev(interface_to_usbdev(interface));
756 iface_desc = interface->cur_altsetting;
757 num_endpts = iface_desc->desc.bNumEndpoints;
758 ifnum = iface_desc->desc.bInterfaceNumber;
759 vendor = le16_to_cpu(usbdev->descriptor.idVendor);
760 product = le16_to_cpu(usbdev->descriptor.idProduct);
762 dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
763 __func__, vendor, product, ifnum);
766 * Scan the endpoint list and set:
767 * first input endpoint = IR endpoint
768 * first output endpoint = display endpoint
770 for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
771 struct usb_endpoint_descriptor *ep;
775 ep = &iface_desc->endpoint[i].desc;
776 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
777 ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
780 ep_dir == USB_DIR_IN &&
781 ep_type == USB_ENDPOINT_XFER_INT) {
785 dev_dbg(dev, "%s: found IR endpoint\n", __func__);
787 } else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
788 ep_type == USB_ENDPOINT_XFER_INT) {
790 display_ep_found = 1;
791 dev_dbg(dev, "%s: found display endpoint\n", __func__);
796 * Some iMON receivers have no display. Unfortunately, it seems
797 * that SoundGraph recycles device IDs between devices both with
800 if (context->display == 0) {
801 display_ep_found = 0;
802 dev_dbg(dev, "%s: device has no display\n", __func__);
805 /* Input endpoint is mandatory */
807 dev_err(dev, "%s: no valid input (IR) endpoint found.\n",
811 goto alloc_status_switch;
814 /* Determine if display requires 6 packets */
815 if (display_ep_found) {
816 if (usb_match_id(interface, vfd_proto_6p_list))
819 dev_dbg(dev, "%s: vfd_proto_6p: %d\n",
820 __func__, vfd_proto_6p);
823 driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
826 goto alloc_status_switch;
828 rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
831 goto alloc_status_switch;
833 if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
834 dev_err(dev, "%s: lirc_buffer_init failed\n", __func__);
836 goto alloc_status_switch;
838 rx_urb = usb_alloc_urb(0, GFP_KERNEL);
840 dev_err(dev, "%s: usb_alloc_urb failed for IR urb\n", __func__);
842 goto alloc_status_switch;
844 tx_urb = usb_alloc_urb(0, GFP_KERNEL);
846 dev_err(dev, "%s: usb_alloc_urb failed for display urb\n",
849 goto alloc_status_switch;
852 mutex_init(&context->ctx_lock);
853 context->vfd_proto_6p = vfd_proto_6p;
855 strcpy(driver->name, MOD_NAME);
857 driver->code_length = BUF_CHUNK_SIZE * 8;
858 driver->sample_rate = 0;
859 driver->features = LIRC_CAN_REC_MODE2;
860 driver->data = context;
862 driver->set_use_inc = ir_open;
863 driver->set_use_dec = ir_close;
864 driver->dev = &interface->dev;
865 driver->owner = THIS_MODULE;
867 mutex_lock(&context->ctx_lock);
869 context->driver = driver;
870 /* start out in keyboard mode */
872 lirc_minor = lirc_register_driver(driver);
873 if (lirc_minor < 0) {
874 dev_err(dev, "%s: lirc_register_driver failed\n", __func__);
878 dev_info(dev, "Registered iMON driver (lirc minor: %d)\n",
881 /* Needed while unregistering! */
882 driver->minor = lirc_minor;
884 context->usbdev = usbdev;
885 context->dev_present = 1;
886 context->rx_endpoint = rx_endpoint;
887 context->rx_urb = rx_urb;
890 * tx is used to send characters to lcd/vfd, associate RF
891 * remotes, set IR protocol, and maybe more...
893 context->tx_endpoint = tx_endpoint;
894 context->tx_urb = tx_urb;
896 if (display_ep_found)
897 context->display = 1;
899 usb_fill_int_urb(context->rx_urb, context->usbdev,
900 usb_rcvintpipe(context->usbdev,
901 context->rx_endpoint->bEndpointAddress),
902 context->usb_rx_buf, sizeof(context->usb_rx_buf),
903 usb_rx_callback, context,
904 context->rx_endpoint->bInterval);
906 retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
909 dev_err(dev, "%s: usb_submit_urb failed for intf0 (%d)\n",
915 usb_set_intfdata(interface, context);
917 if (context->display && ifnum == 0) {
918 dev_dbg(dev, "%s: Registering iMON display with sysfs\n",
921 if (usb_register_dev(interface, &imon_class)) {
922 /* Not a fatal error, so ignore */
923 dev_info(dev, "%s: could not get a minor number for display\n",
928 dev_info(dev, "iMON device (%04x:%04x, intf%d) on usb<%d:%d> initialized\n",
929 vendor, product, ifnum, usbdev->bus->busnum, usbdev->devnum);
932 mutex_unlock(&context->ctx_lock);
935 switch (alloc_status) {
937 lirc_unregister_driver(driver->minor);
939 usb_free_urb(tx_urb);
941 usb_free_urb(rx_urb);
945 lirc_buffer_free(rbuf);
957 if (retval != -ENODEV)
964 mutex_unlock(&driver_lock);
970 * Callback function for USB core API: disconnect
972 static void imon_disconnect(struct usb_interface *interface)
974 struct imon_context *context;
977 /* prevent races with ir_open()/display_open() */
978 mutex_lock(&driver_lock);
980 context = usb_get_intfdata(interface);
981 ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
983 mutex_lock(&context->ctx_lock);
985 usb_set_intfdata(interface, NULL);
987 /* Abort ongoing write */
988 if (atomic_read(&context->tx.busy)) {
989 usb_kill_urb(context->tx_urb);
990 complete_all(&context->tx.finished);
993 context->dev_present = 0;
994 usb_kill_urb(context->rx_urb);
995 if (context->display)
996 usb_deregister_dev(interface, &imon_class);
998 if (!context->ir_isopen && !context->dev_present) {
999 deregister_from_lirc(context);
1000 mutex_unlock(&context->ctx_lock);
1001 if (!context->display_isopen)
1002 free_imon_context(context);
1004 mutex_unlock(&context->ctx_lock);
1006 mutex_unlock(&driver_lock);
1008 dev_info(&interface->dev, "%s: iMON device (intf%d) disconnected\n",
1012 static int imon_suspend(struct usb_interface *intf, pm_message_t message)
1014 struct imon_context *context = usb_get_intfdata(intf);
1016 usb_kill_urb(context->rx_urb);
1021 static int imon_resume(struct usb_interface *intf)
1023 struct imon_context *context = usb_get_intfdata(intf);
1025 usb_fill_int_urb(context->rx_urb, context->usbdev,
1026 usb_rcvintpipe(context->usbdev,
1027 context->rx_endpoint->bEndpointAddress),
1028 context->usb_rx_buf, sizeof(context->usb_rx_buf),
1029 usb_rx_callback, context,
1030 context->rx_endpoint->bInterval);
1032 return usb_submit_urb(context->rx_urb, GFP_ATOMIC);
1035 module_usb_driver(imon_driver);