/* * lirc_imon.c: LIRC/VFD/LCD driver for SoundGraph iMON IR/VFD/LCD * including the iMON PAD model * * Copyright(C) 2004 Venky Raju(dev@venky.ws) * Copyright(C) 2009 Jarod Wilson * * lirc_imon is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include #define MOD_AUTHOR "Venky Raju " #define MOD_DESC "Driver for SoundGraph iMON MultiMedia IR/Display" #define MOD_NAME "lirc_imon" #define MOD_VERSION "0.8" #define DISPLAY_MINOR_BASE 144 #define DEVICE_NAME "lcd%d" #define BUF_CHUNK_SIZE 4 #define BUF_SIZE 128 #define BIT_DURATION 250 /* each bit received is 250us */ /*** P R O T O T Y P E S ***/ /* USB Callback prototypes */ static int imon_probe(struct usb_interface *interface, const struct usb_device_id *id); static void imon_disconnect(struct usb_interface *interface); static void usb_rx_callback(struct urb *urb); static void usb_tx_callback(struct urb *urb); /* suspend/resume support */ static int imon_resume(struct usb_interface *intf); static int imon_suspend(struct usb_interface *intf, pm_message_t message); /* Display file_operations function prototypes */ static int display_open(struct inode *inode, struct file *file); static int display_close(struct inode *inode, struct file *file); /* VFD write operation */ static ssize_t vfd_write(struct file *file, const char *buf, size_t n_bytes, loff_t *pos); /* LIRC driver function prototypes */ static int ir_open(void *data); static void ir_close(void *data); /* Driver init/exit prototypes */ static int __init imon_init(void); static void __exit imon_exit(void); /*** G L O B A L S ***/ #define IMON_DATA_BUF_SZ 35 struct imon_context { struct usb_device *usbdev; /* Newer devices have two interfaces */ int display; /* not all controllers do */ int display_isopen; /* display port has been opened */ int ir_isopen; /* IR port open */ int dev_present; /* USB device presence */ struct mutex ctx_lock; /* to lock this object */ wait_queue_head_t remove_ok; /* For unexpected USB disconnects */ int vfd_proto_6p; /* some VFD require a 6th packet */ struct lirc_driver *driver; struct usb_endpoint_descriptor *rx_endpoint; struct usb_endpoint_descriptor *tx_endpoint; struct urb *rx_urb; struct urb *tx_urb; unsigned char usb_rx_buf[8]; unsigned char usb_tx_buf[8]; struct rx_data { int count; /* length of 0 or 1 sequence */ int prev_bit; /* logic level of sequence */ int initial_space; /* initial space flag */ } rx; struct tx_t { unsigned char data_buf[IMON_DATA_BUF_SZ]; /* user data buffer */ struct completion finished; /* wait for write to finish */ atomic_t busy; /* write in progress */ int status; /* status of tx completion */ } tx; }; static const struct file_operations display_fops = { .owner = THIS_MODULE, .open = &display_open, .write = &vfd_write, .release = &display_close, .llseek = noop_llseek, }; /* * USB Device ID for iMON USB Control Boards * * The Windows drivers contain 6 different inf files, more or less one for * each new device until the 0x0034-0x0046 devices, which all use the same * driver. Some of the devices in the 34-46 range haven't been definitively * identified yet. Early devices have either a TriGem Computer, Inc. or a * Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later * devices use the SoundGraph vendor ID (0x15c2). */ static struct usb_device_id imon_usb_id_table[] = { /* TriGem iMON (IR only) -- TG_iMON.inf */ { USB_DEVICE(0x0aa8, 0x8001) }, /* SoundGraph iMON (IR only) -- sg_imon.inf */ { USB_DEVICE(0x04e8, 0xff30) }, /* SoundGraph iMON VFD (IR & VFD) -- iMON_VFD.inf */ { USB_DEVICE(0x0aa8, 0xffda) }, /* SoundGraph iMON SS (IR & VFD) -- iMON_SS.inf */ { USB_DEVICE(0x15c2, 0xffda) }, {} }; /* Some iMON VFD models requires a 6th packet for VFD writes */ static struct usb_device_id vfd_proto_6p_list[] = { { USB_DEVICE(0x15c2, 0xffda) }, {} }; /* Some iMON devices have no lcd/vfd, don't set one up */ static struct usb_device_id ir_only_list[] = { { USB_DEVICE(0x0aa8, 0x8001) }, { USB_DEVICE(0x04e8, 0xff30) }, {} }; /* USB Device data */ static struct usb_driver imon_driver = { .name = MOD_NAME, .probe = imon_probe, .disconnect = imon_disconnect, .suspend = imon_suspend, .resume = imon_resume, .id_table = imon_usb_id_table, }; static struct usb_class_driver imon_class = { .name = DEVICE_NAME, .fops = &display_fops, .minor_base = DISPLAY_MINOR_BASE, }; /* to prevent races between open() and disconnect(), probing, etc */ static DEFINE_MUTEX(driver_lock); static int debug; /*** M O D U L E C O D E ***/ MODULE_AUTHOR(MOD_AUTHOR); MODULE_DESCRIPTION(MOD_DESC); MODULE_VERSION(MOD_VERSION); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(usb, imon_usb_id_table); module_param(debug, int, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes(default: no)"); static void free_imon_context(struct imon_context *context) { struct device *dev = context->driver->dev; usb_free_urb(context->tx_urb); usb_free_urb(context->rx_urb); lirc_buffer_free(context->driver->rbuf); kfree(context->driver->rbuf); kfree(context->driver); kfree(context); dev_dbg(dev, "%s: iMON context freed\n", __func__); } static void deregister_from_lirc(struct imon_context *context) { int retval; int minor = context->driver->minor; retval = lirc_unregister_driver(minor); if (retval) err("%s: unable to deregister from lirc(%d)", __func__, retval); else printk(KERN_INFO MOD_NAME ": Deregistered iMON driver " "(minor:%d)\n", minor); } /** * Called when the Display device (e.g. /dev/lcd0) * is opened by the application. */ static int display_open(struct inode *inode, struct file *file) { struct usb_interface *interface; struct imon_context *context = NULL; int subminor; int retval = 0; /* prevent races with disconnect */ mutex_lock(&driver_lock); subminor = iminor(inode); interface = usb_find_interface(&imon_driver, subminor); if (!interface) { err("%s: could not find interface for minor %d", __func__, subminor); retval = -ENODEV; goto exit; } context = usb_get_intfdata(interface); if (!context) { err("%s: no context found for minor %d", __func__, subminor); retval = -ENODEV; goto exit; } mutex_lock(&context->ctx_lock); if (!context->display) { err("%s: display not supported by device", __func__); retval = -ENODEV; } else if (context->display_isopen) { err("%s: display port is already open", __func__); retval = -EBUSY; } else { context->display_isopen = 1; file->private_data = context; dev_info(context->driver->dev, "display port opened\n"); } mutex_unlock(&context->ctx_lock); exit: mutex_unlock(&driver_lock); return retval; } /** * Called when the display device (e.g. /dev/lcd0) * is closed by the application. */ static int display_close(struct inode *inode, struct file *file) { struct imon_context *context = NULL; int retval = 0; context = file->private_data; if (!context) { err("%s: no context for device", __func__); return -ENODEV; } mutex_lock(&context->ctx_lock); if (!context->display) { err("%s: display not supported by device", __func__); retval = -ENODEV; } else if (!context->display_isopen) { err("%s: display is not open", __func__); retval = -EIO; } else { context->display_isopen = 0; dev_info(context->driver->dev, "display port closed\n"); if (!context->dev_present && !context->ir_isopen) { /* * Device disconnected before close and IR port is not * open. If IR port is open, context will be deleted by * ir_close. */ mutex_unlock(&context->ctx_lock); free_imon_context(context); return retval; } } mutex_unlock(&context->ctx_lock); return retval; } /** * Sends a packet to the device -- this function must be called * with context->ctx_lock held. */ static int send_packet(struct imon_context *context) { unsigned int pipe; int interval = 0; int retval = 0; /* Check if we need to use control or interrupt urb */ pipe = usb_sndintpipe(context->usbdev, context->tx_endpoint->bEndpointAddress); interval = context->tx_endpoint->bInterval; usb_fill_int_urb(context->tx_urb, context->usbdev, pipe, context->usb_tx_buf, sizeof(context->usb_tx_buf), usb_tx_callback, context, interval); context->tx_urb->actual_length = 0; init_completion(&context->tx.finished); atomic_set(&(context->tx.busy), 1); retval = usb_submit_urb(context->tx_urb, GFP_KERNEL); if (retval) { atomic_set(&(context->tx.busy), 0); err("%s: error submitting urb(%d)", __func__, retval); } else { /* Wait for transmission to complete (or abort) */ mutex_unlock(&context->ctx_lock); retval = wait_for_completion_interruptible( &context->tx.finished); if (retval) err("%s: task interrupted", __func__); mutex_lock(&context->ctx_lock); retval = context->tx.status; if (retval) err("%s: packet tx failed (%d)", __func__, retval); } return retval; } /** * Writes data to the VFD. The iMON VFD is 2x16 characters * and requires data in 5 consecutive USB interrupt packets, * each packet but the last carrying 7 bytes. * * I don't know if the VFD board supports features such as * scrolling, clearing rows, blanking, etc. so at * the caller must provide a full screen of data. If fewer * than 32 bytes are provided spaces will be appended to * generate a full screen. */ static ssize_t vfd_write(struct file *file, const char *buf, size_t n_bytes, loff_t *pos) { int i; int offset; int seq; int retval = 0; struct imon_context *context; const unsigned char vfd_packet6[] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF }; int *data_buf = NULL; context = file->private_data; if (!context) { err("%s: no context for device", __func__); return -ENODEV; } mutex_lock(&context->ctx_lock); if (!context->dev_present) { err("%s: no iMON device present", __func__); retval = -ENODEV; goto exit; } if (n_bytes <= 0 || n_bytes > IMON_DATA_BUF_SZ - 3) { err("%s: invalid payload size", __func__); retval = -EINVAL; goto exit; } data_buf = memdup_user(buf, n_bytes); if (IS_ERR(data_buf)) { retval = PTR_ERR(data_buf); goto exit; } memcpy(context->tx.data_buf, data_buf, n_bytes); /* Pad with spaces */ for (i = n_bytes; i < IMON_DATA_BUF_SZ - 3; ++i) context->tx.data_buf[i] = ' '; for (i = IMON_DATA_BUF_SZ - 3; i < IMON_DATA_BUF_SZ; ++i) context->tx.data_buf[i] = 0xFF; offset = 0; seq = 0; do { memcpy(context->usb_tx_buf, context->tx.data_buf + offset, 7); context->usb_tx_buf[7] = (unsigned char) seq; retval = send_packet(context); if (retval) { err("%s: send packet failed for packet #%d", __func__, seq/2); goto exit; } else { seq += 2; offset += 7; } } while (offset < IMON_DATA_BUF_SZ); if (context->vfd_proto_6p) { /* Send packet #6 */ memcpy(context->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6)); context->usb_tx_buf[7] = (unsigned char) seq; retval = send_packet(context); if (retval) err("%s: send packet failed for packet #%d", __func__, seq/2); } exit: mutex_unlock(&context->ctx_lock); kfree(data_buf); return (!retval) ? n_bytes : retval; } /** * Callback function for USB core API: transmit data */ static void usb_tx_callback(struct urb *urb) { struct imon_context *context; if (!urb) return; context = (struct imon_context *)urb->context; if (!context) return; context->tx.status = urb->status; /* notify waiters that write has finished */ atomic_set(&context->tx.busy, 0); complete(&context->tx.finished); return; } /** * Called by lirc_dev when the application opens /dev/lirc */ static int ir_open(void *data) { int retval = 0; struct imon_context *context; /* prevent races with disconnect */ mutex_lock(&driver_lock); context = (struct imon_context *)data; /* initial IR protocol decode variables */ context->rx.count = 0; context->rx.initial_space = 1; context->rx.prev_bit = 0; context->ir_isopen = 1; dev_info(context->driver->dev, "IR port opened\n"); mutex_unlock(&driver_lock); return retval; } /** * Called by lirc_dev when the application closes /dev/lirc */ static void ir_close(void *data) { struct imon_context *context; context = (struct imon_context *)data; if (!context) { err("%s: no context for device", __func__); return; } mutex_lock(&context->ctx_lock); context->ir_isopen = 0; dev_info(context->driver->dev, "IR port closed\n"); if (!context->dev_present) { /* * Device disconnected while IR port was still open. Driver * was not deregistered at disconnect time, so do it now. */ deregister_from_lirc(context); if (!context->display_isopen) { mutex_unlock(&context->ctx_lock); free_imon_context(context); return; } /* * If display port is open, context will be deleted by * display_close */ } mutex_unlock(&context->ctx_lock); return; } /** * Convert bit count to time duration (in us) and submit * the value to lirc_dev. */ static void submit_data(struct imon_context *context) { unsigned char buf[4]; int value = context->rx.count; int i; dev_dbg(context->driver->dev, "submitting data to LIRC\n"); value *= BIT_DURATION; value &= PULSE_MASK; if (context->rx.prev_bit) value |= PULSE_BIT; for (i = 0; i < 4; ++i) buf[i] = value>>(i*8); lirc_buffer_write(context->driver->rbuf, buf); wake_up(&context->driver->rbuf->wait_poll); return; } static inline int tv2int(const struct timeval *a, const struct timeval *b) { int usecs = 0; int sec = 0; if (b->tv_usec > a->tv_usec) { usecs = 1000000; sec--; } usecs += a->tv_usec - b->tv_usec; sec += a->tv_sec - b->tv_sec; sec *= 1000; usecs /= 1000; sec += usecs; if (sec < 0) sec = 1000; return sec; } /** * Process the incoming packet */ static void imon_incoming_packet(struct imon_context *context, struct urb *urb, int intf) { int len = urb->actual_length; unsigned char *buf = urb->transfer_buffer; struct device *dev = context->driver->dev; int octet, bit; unsigned char mask; int i; /* * just bail out if no listening IR client */ if (!context->ir_isopen) return; if (len != 8) { dev_warn(dev, "imon %s: invalid incoming packet " "size (len = %d, intf%d)\n", __func__, len, intf); return; } if (debug) { printk(KERN_INFO "raw packet: "); for (i = 0; i < len; ++i) printk("%02x ", buf[i]); printk("\n"); } /* * Translate received data to pulse and space lengths. * Received data is active low, i.e. pulses are 0 and * spaces are 1. * * My original algorithm was essentially similar to * Changwoo Ryu's with the exception that he switched * the incoming bits to active high and also fed an * initial space to LIRC at the start of a new sequence * if the previous bit was a pulse. * * I've decided to adopt his algorithm. */ if (buf[7] == 1 && context->rx.initial_space) { /* LIRC requires a leading space */ context->rx.prev_bit = 0; context->rx.count = 4; submit_data(context); context->rx.count = 0; } for (octet = 0; octet < 5; ++octet) { mask = 0x80; for (bit = 0; bit < 8; ++bit) { int curr_bit = !(buf[octet] & mask); if (curr_bit != context->rx.prev_bit) { if (context->rx.count) { submit_data(context); context->rx.count = 0; } context->rx.prev_bit = curr_bit; } ++context->rx.count; mask >>= 1; } } if (buf[7] == 10) { if (context->rx.count) { submit_data(context); context->rx.count = 0; } context->rx.initial_space = context->rx.prev_bit; } } /** * Callback function for USB core API: receive data */ static void usb_rx_callback(struct urb *urb) { struct imon_context *context; int intfnum = 0; if (!urb) return; context = (struct imon_context *)urb->context; if (!context) return; switch (urb->status) { case -ENOENT: /* usbcore unlink successful! */ return; case 0: imon_incoming_packet(context, urb, intfnum); break; default: dev_warn(context->driver->dev, "imon %s: status(%d): ignored\n", __func__, urb->status); break; } usb_submit_urb(context->rx_urb, GFP_ATOMIC); return; } /** * Callback function for USB core API: Probe */ static int imon_probe(struct usb_interface *interface, const struct usb_device_id *id) { struct usb_device *usbdev = NULL; struct usb_host_interface *iface_desc = NULL; struct usb_endpoint_descriptor *rx_endpoint = NULL; struct usb_endpoint_descriptor *tx_endpoint = NULL; struct urb *rx_urb = NULL; struct urb *tx_urb = NULL; struct lirc_driver *driver = NULL; struct lirc_buffer *rbuf = NULL; struct device *dev = &interface->dev; int ifnum; int lirc_minor = 0; int num_endpts; int retval = 0; int display_ep_found = 0; int ir_ep_found = 0; int alloc_status = 0; int vfd_proto_6p = 0; struct imon_context *context = NULL; int i; u16 vendor, product; /* prevent races probing devices w/multiple interfaces */ mutex_lock(&driver_lock); context = kzalloc(sizeof(struct imon_context), GFP_KERNEL); if (!context) { err("%s: kzalloc failed for context", __func__); alloc_status = 1; goto alloc_status_switch; } /* * Try to auto-detect the type of display if the user hasn't set * it by hand via the display_type modparam. Default is VFD. */ if (usb_match_id(interface, ir_only_list)) context->display = 0; else context->display = 1; usbdev = usb_get_dev(interface_to_usbdev(interface)); iface_desc = interface->cur_altsetting; num_endpts = iface_desc->desc.bNumEndpoints; ifnum = iface_desc->desc.bInterfaceNumber; vendor = le16_to_cpu(usbdev->descriptor.idVendor); product = le16_to_cpu(usbdev->descriptor.idProduct); dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n", __func__, vendor, product, ifnum); /* * Scan the endpoint list and set: * first input endpoint = IR endpoint * first output endpoint = display endpoint */ for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) { struct usb_endpoint_descriptor *ep; int ep_dir; int ep_type; ep = &iface_desc->endpoint[i].desc; ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK; ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; if (!ir_ep_found && ep_dir == USB_DIR_IN && ep_type == USB_ENDPOINT_XFER_INT) { rx_endpoint = ep; ir_ep_found = 1; dev_dbg(dev, "%s: found IR endpoint\n", __func__); } else if (!display_ep_found && ep_dir == USB_DIR_OUT && ep_type == USB_ENDPOINT_XFER_INT) { tx_endpoint = ep; display_ep_found = 1; dev_dbg(dev, "%s: found display endpoint\n", __func__); } } /* * Some iMON receivers have no display. Unfortunately, it seems * that SoundGraph recycles device IDs between devices both with * and without... :\ */ if (context->display == 0) { display_ep_found = 0; dev_dbg(dev, "%s: device has no display\n", __func__); } /* Input endpoint is mandatory */ if (!ir_ep_found) { err("%s: no valid input (IR) endpoint found.", __func__); retval = -ENODEV; alloc_status = 2; goto alloc_status_switch; } /* Determine if display requires 6 packets */ if (display_ep_found) { if (usb_match_id(interface, vfd_proto_6p_list)) vfd_proto_6p = 1; dev_dbg(dev, "%s: vfd_proto_6p: %d\n", __func__, vfd_proto_6p); } driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL); if (!driver) { err("%s: kzalloc failed for lirc_driver", __func__); alloc_status = 2; goto alloc_status_switch; } rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL); if (!rbuf) { err("%s: kmalloc failed for lirc_buffer", __func__); alloc_status = 3; goto alloc_status_switch; } if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) { err("%s: lirc_buffer_init failed", __func__); alloc_status = 4; goto alloc_status_switch; } rx_urb = usb_alloc_urb(0, GFP_KERNEL); if (!rx_urb) { err("%s: usb_alloc_urb failed for IR urb", __func__); alloc_status = 5; goto alloc_status_switch; } tx_urb = usb_alloc_urb(0, GFP_KERNEL); if (!tx_urb) { err("%s: usb_alloc_urb failed for display urb", __func__); alloc_status = 6; goto alloc_status_switch; } mutex_init(&context->ctx_lock); context->vfd_proto_6p = vfd_proto_6p; strcpy(driver->name, MOD_NAME); driver->minor = -1; driver->code_length = BUF_CHUNK_SIZE * 8; driver->sample_rate = 0; driver->features = LIRC_CAN_REC_MODE2; driver->data = context; driver->rbuf = rbuf; driver->set_use_inc = ir_open; driver->set_use_dec = ir_close; driver->dev = &interface->dev; driver->owner = THIS_MODULE; mutex_lock(&context->ctx_lock); context->driver = driver; /* start out in keyboard mode */ lirc_minor = lirc_register_driver(driver); if (lirc_minor < 0) { err("%s: lirc_register_driver failed", __func__); alloc_status = 7; goto unlock; } else dev_info(dev, "Registered iMON driver " "(lirc minor: %d)\n", lirc_minor); /* Needed while unregistering! */ driver->minor = lirc_minor; context->usbdev = usbdev; context->dev_present = 1; context->rx_endpoint = rx_endpoint; context->rx_urb = rx_urb; /* * tx is used to send characters to lcd/vfd, associate RF * remotes, set IR protocol, and maybe more... */ context->tx_endpoint = tx_endpoint; context->tx_urb = tx_urb; if (display_ep_found) context->display = 1; usb_fill_int_urb(context->rx_urb, context->usbdev, usb_rcvintpipe(context->usbdev, context->rx_endpoint->bEndpointAddress), context->usb_rx_buf, sizeof(context->usb_rx_buf), usb_rx_callback, context, context->rx_endpoint->bInterval); retval = usb_submit_urb(context->rx_urb, GFP_KERNEL); if (retval) { err("%s: usb_submit_urb failed for intf0 (%d)", __func__, retval); mutex_unlock(&context->ctx_lock); goto exit; } usb_set_intfdata(interface, context); if (context->display && ifnum == 0) { dev_dbg(dev, "%s: Registering iMON display with sysfs\n", __func__); if (usb_register_dev(interface, &imon_class)) { /* Not a fatal error, so ignore */ dev_info(dev, "%s: could not get a minor number for " "display\n", __func__); } } dev_info(dev, "iMON device (%04x:%04x, intf%d) on " "usb<%d:%d> initialized\n", vendor, product, ifnum, usbdev->bus->busnum, usbdev->devnum); unlock: mutex_unlock(&context->ctx_lock); alloc_status_switch: switch (alloc_status) { case 7: usb_free_urb(tx_urb); case 6: usb_free_urb(rx_urb); case 5: if (rbuf) lirc_buffer_free(rbuf); case 4: kfree(rbuf); case 3: kfree(driver); case 2: kfree(context); context = NULL; case 1: if (retval != -ENODEV) retval = -ENOMEM; break; case 0: retval = 0; } exit: mutex_unlock(&driver_lock); return retval; } /** * Callback function for USB core API: disconnect */ static void imon_disconnect(struct usb_interface *interface) { struct imon_context *context; int ifnum; /* prevent races with ir_open()/display_open() */ mutex_lock(&driver_lock); context = usb_get_intfdata(interface); ifnum = interface->cur_altsetting->desc.bInterfaceNumber; mutex_lock(&context->ctx_lock); usb_set_intfdata(interface, NULL); /* Abort ongoing write */ if (atomic_read(&context->tx.busy)) { usb_kill_urb(context->tx_urb); complete_all(&context->tx.finished); } context->dev_present = 0; usb_kill_urb(context->rx_urb); if (context->display) usb_deregister_dev(interface, &imon_class); if (!context->ir_isopen && !context->dev_present) { deregister_from_lirc(context); mutex_unlock(&context->ctx_lock); if (!context->display_isopen) free_imon_context(context); } else mutex_unlock(&context->ctx_lock); mutex_unlock(&driver_lock); printk(KERN_INFO "%s: iMON device (intf%d) disconnected\n", __func__, ifnum); } static int imon_suspend(struct usb_interface *intf, pm_message_t message) { struct imon_context *context = usb_get_intfdata(intf); usb_kill_urb(context->rx_urb); return 0; } static int imon_resume(struct usb_interface *intf) { int rc = 0; struct imon_context *context = usb_get_intfdata(intf); usb_fill_int_urb(context->rx_urb, context->usbdev, usb_rcvintpipe(context->usbdev, context->rx_endpoint->bEndpointAddress), context->usb_rx_buf, sizeof(context->usb_rx_buf), usb_rx_callback, context, context->rx_endpoint->bInterval); rc = usb_submit_urb(context->rx_urb, GFP_ATOMIC); return rc; } module_usb_driver(imon_driver);