/* USB Driver for Sierra Wireless Copyright (C) 2006, 2007, 2008 Kevin Lloyd <klloyd@sierrawireless.com> IMPORTANT DISCLAIMER: This driver is not commercially supported by Sierra Wireless. Use at your own risk. This driver is free software; you can redistribute it and/or modify it under the terms of Version 2 of the GNU General Public License as published by the Free Software Foundation. Portions based on the option driver by Matthias Urlichs <smurf@smurf.noris.de> Whom based his on the Keyspan driver by Hugh Blemings <hugh@blemings.org> */ #define DRIVER_VERSION "v.1.3.2" #define DRIVER_AUTHOR "Kevin Lloyd <klloyd@sierrawireless.com>" #define DRIVER_DESC "USB Driver for Sierra Wireless USB modems" #include <linux/kernel.h> #include <linux/jiffies.h> #include <linux/errno.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/module.h> #include <linux/usb.h> #include <linux/usb/serial.h> #include <linux/usb/ch9.h> #define SWIMS_USB_REQUEST_SetPower 0x00 #define SWIMS_USB_REQUEST_SetNmea 0x07 /* per port private data */ #define N_IN_URB 4 #define N_OUT_URB 4 #define IN_BUFLEN 4096 static int debug; static int nmea; static int sierra_set_power_state(struct usb_device *udev, __u16 swiState) { int result; dev_dbg(&udev->dev, "%s", __func__); result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), SWIMS_USB_REQUEST_SetPower, /* __u8 request */ USB_TYPE_VENDOR, /* __u8 request type */ swiState, /* __u16 value */ 0, /* __u16 index */ NULL, /* void *data */ 0, /* __u16 size */ USB_CTRL_SET_TIMEOUT); /* int timeout */ return result; } static int sierra_vsc_set_nmea(struct usb_device *udev, __u16 enable) { int result; dev_dbg(&udev->dev, "%s", __func__); result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), SWIMS_USB_REQUEST_SetNmea, /* __u8 request */ USB_TYPE_VENDOR, /* __u8 request type */ enable, /* __u16 value */ 0x0000, /* __u16 index */ NULL, /* void *data */ 0, /* __u16 size */ USB_CTRL_SET_TIMEOUT); /* int timeout */ return result; } static int sierra_calc_num_ports(struct usb_serial *serial) { int result; int *num_ports = usb_get_serial_data(serial); dev_dbg(&serial->dev->dev, "%s", __func__); result = *num_ports; if (result) { kfree(num_ports); usb_set_serial_data(serial, NULL); } return result; } static int sierra_calc_interface(struct usb_serial *serial) { int interface; struct usb_interface *p_interface; struct usb_host_interface *p_host_interface; dev_dbg(&serial->dev->dev, "%s", __func__); /* Get the interface structure pointer from the serial struct */ p_interface = serial->interface; /* Get a pointer to the host interface structure */ p_host_interface = p_interface->cur_altsetting; /* read the interface descriptor for this active altsetting * to find out the interface number we are on */ interface = p_host_interface->desc.bInterfaceNumber; return interface; } static int sierra_probe(struct usb_serial *serial, const struct usb_device_id *id) { int result = 0; struct usb_device *udev; int *num_ports; u8 ifnum; u8 numendpoints; dev_dbg(&serial->dev->dev, "%s", __func__); num_ports = kmalloc(sizeof(*num_ports), GFP_KERNEL); if (!num_ports) return -ENOMEM; ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber; numendpoints = serial->interface->cur_altsetting->desc.bNumEndpoints; udev = serial->dev; /* Figure out the interface number from the serial structure */ ifnum = sierra_calc_interface(serial); /* * If this interface supports more than 1 alternate * select the 2nd one */ if (serial->interface->num_altsetting == 2) { dev_dbg(&udev->dev, "Selecting alt setting for interface %d\n", ifnum); /* We know the alternate setting is 1 for the MC8785 */ usb_set_interface(udev, ifnum, 1); } /* Dummy interface present on some SKUs should be ignored */ if (ifnum == 0x99) *num_ports = 0; else if (numendpoints <= 3) *num_ports = 1; else *num_ports = (numendpoints-1)/2; /* * save off our num_ports info so that we can use it in the * calc_num_ports callback */ usb_set_serial_data(serial, (void *)num_ports); return result; } static struct usb_device_id id_table [] = { { USB_DEVICE(0x1199, 0x0017) }, /* Sierra Wireless EM5625 */ { USB_DEVICE(0x1199, 0x0018) }, /* Sierra Wireless MC5720 */ { USB_DEVICE(0x1199, 0x0218) }, /* Sierra Wireless MC5720 */ { USB_DEVICE(0x03f0, 0x1b1d) }, /* HP ev2200 a.k.a MC5720 */ { USB_DEVICE(0x1199, 0x0020) }, /* Sierra Wireless MC5725 */ { USB_DEVICE(0x1199, 0x0024) }, /* Sierra Wireless MC5727 */ { USB_DEVICE(0x1199, 0x0220) }, /* Sierra Wireless MC5725 */ { USB_DEVICE(0x1199, 0x0019) }, /* Sierra Wireless AirCard 595 */ { USB_DEVICE(0x1199, 0x0021) }, /* Sierra Wireless AirCard 597E */ { USB_DEVICE(0x1199, 0x0120) }, /* Sierra Wireless USB Dongle 595U */ /* Sierra Wireless C597 */ { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0023, 0xFF, 0xFF, 0xFF) }, /* Sierra Wireless Device */ { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0025, 0xFF, 0xFF, 0xFF) }, { USB_DEVICE(0x1199, 0x0026) }, /* Sierra Wireless Device */ { USB_DEVICE(0x1199, 0x0027) }, /* Sierra Wireless Device */ { USB_DEVICE(0x1199, 0x0028) }, /* Sierra Wireless Device */ { USB_DEVICE(0x1199, 0x6802) }, /* Sierra Wireless MC8755 */ { USB_DEVICE(0x1199, 0x6804) }, /* Sierra Wireless MC8755 */ { USB_DEVICE(0x1199, 0x6803) }, /* Sierra Wireless MC8765 */ { USB_DEVICE(0x1199, 0x6812) }, /* Sierra Wireless MC8775 & AC 875U */ { USB_DEVICE(0x1199, 0x6813) }, /* Sierra Wireless MC8775 (Lenovo) */ { USB_DEVICE(0x1199, 0x6815) }, /* Sierra Wireless MC8775 */ { USB_DEVICE(0x03f0, 0x1e1d) }, /* HP hs2300 a.k.a MC8775 */ { USB_DEVICE(0x1199, 0x6820) }, /* Sierra Wireless AirCard 875 */ { USB_DEVICE(0x1199, 0x6821) }, /* Sierra Wireless AirCard 875U */ { USB_DEVICE(0x1199, 0x6832) }, /* Sierra Wireless MC8780 */ { USB_DEVICE(0x1199, 0x6833) }, /* Sierra Wireless MC8781 */ { USB_DEVICE(0x1199, 0x683A) }, /* Sierra Wireless MC8785 */ { USB_DEVICE(0x1199, 0x683B) }, /* Sierra Wireless MC8785 Composite */ { USB_DEVICE(0x1199, 0x683C) }, /* Sierra Wireless MC8790 */ { USB_DEVICE(0x1199, 0x683D) }, /* Sierra Wireless MC8790 */ { USB_DEVICE(0x1199, 0x683E) }, /* Sierra Wireless MC8790 */ { USB_DEVICE(0x1199, 0x6850) }, /* Sierra Wireless AirCard 880 */ { USB_DEVICE(0x1199, 0x6851) }, /* Sierra Wireless AirCard 881 */ { USB_DEVICE(0x1199, 0x6852) }, /* Sierra Wireless AirCard 880 E */ { USB_DEVICE(0x1199, 0x6853) }, /* Sierra Wireless AirCard 881 E */ { USB_DEVICE(0x1199, 0x6855) }, /* Sierra Wireless AirCard 880 U */ { USB_DEVICE(0x1199, 0x6856) }, /* Sierra Wireless AirCard 881 U */ { USB_DEVICE(0x1199, 0x6859) }, /* Sierra Wireless AirCard 885 E */ { USB_DEVICE(0x1199, 0x685A) }, /* Sierra Wireless AirCard 885 E */ /* Sierra Wireless C885 */ { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6880, 0xFF, 0xFF, 0xFF)}, /* Sierra Wireless Device */ { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6890, 0xFF, 0xFF, 0xFF)}, /* Sierra Wireless Device */ { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6891, 0xFF, 0xFF, 0xFF)}, /* Sierra Wireless Device */ { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6892, 0xFF, 0xFF, 0xFF)}, { USB_DEVICE(0x1199, 0x0112) }, /* Sierra Wireless AirCard 580 */ { USB_DEVICE(0x0F3D, 0x0112) }, /* Airprime/Sierra PC 5220 */ { } }; MODULE_DEVICE_TABLE(usb, id_table); static struct usb_driver sierra_driver = { .name = "sierra", .probe = usb_serial_probe, .disconnect = usb_serial_disconnect, .id_table = id_table, .no_dynamic_id = 1, }; struct sierra_port_private { spinlock_t lock; /* lock the structure */ int outstanding_urbs; /* number of out urbs in flight */ /* Input endpoints and buffers for this port */ struct urb *in_urbs[N_IN_URB]; char *in_buffer[N_IN_URB]; /* Settings for the port */ int rts_state; /* Handshaking pins (outputs) */ int dtr_state; int cts_state; /* Handshaking pins (inputs) */ int dsr_state; int dcd_state; int ri_state; }; static int sierra_send_setup(struct tty_struct *tty, struct usb_serial_port *port) { struct usb_serial *serial = port->serial; struct sierra_port_private *portdata; __u16 interface = 0; dev_dbg(&port->dev, "%s", __func__); portdata = usb_get_serial_port_data(port); if (tty) { int val = 0; if (portdata->dtr_state) val |= 0x01; if (portdata->rts_state) val |= 0x02; /* If composite device then properly report interface */ if (serial->num_ports == 1) interface = sierra_calc_interface(serial); /* Otherwise the need to do non-composite mapping */ else { if (port->bulk_out_endpointAddress == 2) interface = 0; else if (port->bulk_out_endpointAddress == 4) interface = 1; else if (port->bulk_out_endpointAddress == 5) interface = 2; } return usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 0x22, 0x21, val, interface, NULL, 0, USB_CTRL_SET_TIMEOUT); } return 0; } static void sierra_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { dev_dbg(&port->dev, "%s", __func__); tty_termios_copy_hw(tty->termios, old_termios); sierra_send_setup(tty, port); } static int sierra_tiocmget(struct tty_struct *tty, struct file *file) { struct usb_serial_port *port = tty->driver_data; unsigned int value; struct sierra_port_private *portdata; dev_dbg(&port->dev, "%s", __func__); portdata = usb_get_serial_port_data(port); value = ((portdata->rts_state) ? TIOCM_RTS : 0) | ((portdata->dtr_state) ? TIOCM_DTR : 0) | ((portdata->cts_state) ? TIOCM_CTS : 0) | ((portdata->dsr_state) ? TIOCM_DSR : 0) | ((portdata->dcd_state) ? TIOCM_CAR : 0) | ((portdata->ri_state) ? TIOCM_RNG : 0); return value; } static int sierra_tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear) { struct usb_serial_port *port = tty->driver_data; struct sierra_port_private *portdata; portdata = usb_get_serial_port_data(port); if (set & TIOCM_RTS) portdata->rts_state = 1; if (set & TIOCM_DTR) portdata->dtr_state = 1; if (clear & TIOCM_RTS) portdata->rts_state = 0; if (clear & TIOCM_DTR) portdata->dtr_state = 0; return sierra_send_setup(tty, port); } static void sierra_outdat_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; struct sierra_port_private *portdata = usb_get_serial_port_data(port); int status = urb->status; unsigned long flags; dev_dbg(&port->dev, "%s - port %d", __func__, port->number); /* free up the transfer buffer, as usb_free_urb() does not do this */ kfree(urb->transfer_buffer); if (status) dev_dbg(&port->dev, "%s - nonzero write bulk status " "received: %d", __func__, status); spin_lock_irqsave(&portdata->lock, flags); --portdata->outstanding_urbs; spin_unlock_irqrestore(&portdata->lock, flags); usb_serial_port_softint(port); } /* Write */ static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port, const unsigned char *buf, int count) { struct sierra_port_private *portdata = usb_get_serial_port_data(port); struct usb_serial *serial = port->serial; unsigned long flags; unsigned char *buffer; struct urb *urb; int status; portdata = usb_get_serial_port_data(port); dev_dbg(&port->dev, "%s: write (%d chars)", __func__, count); spin_lock_irqsave(&portdata->lock, flags); if (portdata->outstanding_urbs > N_OUT_URB) { spin_unlock_irqrestore(&portdata->lock, flags); dev_dbg(&port->dev, "%s - write limit hit\n", __func__); return 0; } portdata->outstanding_urbs++; spin_unlock_irqrestore(&portdata->lock, flags); buffer = kmalloc(count, GFP_ATOMIC); if (!buffer) { dev_err(&port->dev, "out of memory\n"); count = -ENOMEM; goto error_no_buffer; } urb = usb_alloc_urb(0, GFP_ATOMIC); if (!urb) { dev_err(&port->dev, "no more free urbs\n"); count = -ENOMEM; goto error_no_urb; } memcpy(buffer, buf, count); usb_serial_debug_data(debug, &port->dev, __func__, count, buffer); usb_fill_bulk_urb(urb, serial->dev, usb_sndbulkpipe(serial->dev, port->bulk_out_endpointAddress), buffer, count, sierra_outdat_callback, port); /* send it down the pipe */ status = usb_submit_urb(urb, GFP_ATOMIC); if (status) { dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed " "with status = %d\n", __func__, status); count = status; goto error; } /* we are done with this urb, so let the host driver * really free it when it is finished with it */ usb_free_urb(urb); return count; error: usb_free_urb(urb); error_no_urb: kfree(buffer); error_no_buffer: spin_lock_irqsave(&portdata->lock, flags); --portdata->outstanding_urbs; spin_unlock_irqrestore(&portdata->lock, flags); return count; } static void sierra_indat_callback(struct urb *urb) { int err; int endpoint; struct usb_serial_port *port; struct tty_struct *tty; unsigned char *data = urb->transfer_buffer; int status = urb->status; dbg("%s: %p", __func__, urb); endpoint = usb_pipeendpoint(urb->pipe); port = urb->context; if (status) { dev_dbg(&port->dev, "%s: nonzero status: %d on" " endpoint %02x.", __func__, status, endpoint); } else { if (urb->actual_length) { tty = tty_port_tty_get(&port->port); tty_buffer_request_room(tty, urb->actual_length); tty_insert_flip_string(tty, data, urb->actual_length); tty_flip_buffer_push(tty); tty_kref_put(tty); } else dev_dbg(&port->dev, "%s: empty read urb" " received", __func__); /* Resubmit urb so we continue receiving */ if (port->port.count && status != -ESHUTDOWN) { err = usb_submit_urb(urb, GFP_ATOMIC); if (err) dev_err(&port->dev, "resubmit read urb failed." "(%d)\n", err); } } return; } static void sierra_instat_callback(struct urb *urb) { int err; int status = urb->status; struct usb_serial_port *port = urb->context; struct sierra_port_private *portdata = usb_get_serial_port_data(port); struct usb_serial *serial = port->serial; dev_dbg(&port->dev, "%s", __func__); dev_dbg(&port->dev, "%s: urb %p port %p has data %p", __func__, urb, port, portdata); if (status == 0) { struct usb_ctrlrequest *req_pkt = (struct usb_ctrlrequest *)urb->transfer_buffer; if (!req_pkt) { dev_dbg(&port->dev, "%s: NULL req_pkt\n", __func__); return; } if ((req_pkt->bRequestType == 0xA1) && (req_pkt->bRequest == 0x20)) { int old_dcd_state; unsigned char signals = *((unsigned char *) urb->transfer_buffer + sizeof(struct usb_ctrlrequest)); struct tty_struct *tty; dev_dbg(&port->dev, "%s: signal x%x", __func__, signals); old_dcd_state = portdata->dcd_state; portdata->cts_state = 1; portdata->dcd_state = ((signals & 0x01) ? 1 : 0); portdata->dsr_state = ((signals & 0x02) ? 1 : 0); portdata->ri_state = ((signals & 0x08) ? 1 : 0); tty = tty_port_tty_get(&port->port); if (tty && !C_CLOCAL(tty) && old_dcd_state && !portdata->dcd_state) tty_hangup(tty); tty_kref_put(tty); } else { dev_dbg(&port->dev, "%s: type %x req %x", __func__, req_pkt->bRequestType, req_pkt->bRequest); } } else dev_dbg(&port->dev, "%s: error %d", __func__, status); /* Resubmit urb so we continue receiving IRQ data */ if (status != -ESHUTDOWN) { urb->dev = serial->dev; err = usb_submit_urb(urb, GFP_ATOMIC); if (err) dev_dbg(&port->dev, "%s: resubmit intr urb " "failed. (%d)", __func__, err); } } static int sierra_write_room(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct sierra_port_private *portdata = usb_get_serial_port_data(port); unsigned long flags; dev_dbg(&port->dev, "%s - port %d", __func__, port->number); /* try to give a good number back based on if we have any free urbs at * this point in time */ spin_lock_irqsave(&portdata->lock, flags); if (portdata->outstanding_urbs > N_OUT_URB * 2 / 3) { spin_unlock_irqrestore(&portdata->lock, flags); dev_dbg(&port->dev, "%s - write limit hit\n", __func__); return 0; } spin_unlock_irqrestore(&portdata->lock, flags); return 2048; } static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port, struct file *filp) { struct sierra_port_private *portdata; struct usb_serial *serial = port->serial; int i; struct urb *urb; int result; portdata = usb_get_serial_port_data(port); dev_dbg(&port->dev, "%s", __func__); /* Set some sane defaults */ portdata->rts_state = 1; portdata->dtr_state = 1; /* Reset low level data toggle and start reading from endpoints */ for (i = 0; i < N_IN_URB; i++) { urb = portdata->in_urbs[i]; if (!urb) continue; if (urb->dev != serial->dev) { dev_dbg(&port->dev, "%s: dev %p != %p", __func__, urb->dev, serial->dev); continue; } /* * make sure endpoint data toggle is synchronized with the * device */ usb_clear_halt(urb->dev, urb->pipe); result = usb_submit_urb(urb, GFP_KERNEL); if (result) { dev_err(&port->dev, "submit urb %d failed (%d) %d\n", i, result, urb->transfer_buffer_length); } } if (tty) tty->low_latency = 1; sierra_send_setup(tty, port); /* start up the interrupt endpoint if we have one */ if (port->interrupt_in_urb) { result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); if (result) dev_err(&port->dev, "submit irq_in urb failed %d\n", result); } return 0; } static void sierra_close(struct tty_struct *tty, struct usb_serial_port *port, struct file *filp) { int i; struct usb_serial *serial = port->serial; struct sierra_port_private *portdata; dev_dbg(&port->dev, "%s", __func__); portdata = usb_get_serial_port_data(port); portdata->rts_state = 0; portdata->dtr_state = 0; if (serial->dev) { mutex_lock(&serial->disc_mutex); if (!serial->disconnected) sierra_send_setup(tty, port); mutex_unlock(&serial->disc_mutex); /* Stop reading/writing urbs */ for (i = 0; i < N_IN_URB; i++) usb_kill_urb(portdata->in_urbs[i]); } usb_kill_urb(port->interrupt_in_urb); tty_port_tty_set(&port->port, NULL); } static int sierra_startup(struct usb_serial *serial) { struct usb_serial_port *port; struct sierra_port_private *portdata; struct urb *urb; int i; int j; dev_dbg(&serial->dev->dev, "%s", __func__); /* Set Device mode to D0 */ sierra_set_power_state(serial->dev, 0x0000); /* Check NMEA and set */ if (nmea) sierra_vsc_set_nmea(serial->dev, 1); /* Now setup per port private data */ for (i = 0; i < serial->num_ports; i++) { port = serial->port[i]; portdata = kzalloc(sizeof(*portdata), GFP_KERNEL); if (!portdata) { dev_dbg(&port->dev, "%s: kmalloc for " "sierra_port_private (%d) failed!.", __func__, i); return -ENOMEM; } spin_lock_init(&portdata->lock); for (j = 0; j < N_IN_URB; j++) { portdata->in_buffer[j] = kmalloc(IN_BUFLEN, GFP_KERNEL); if (!portdata->in_buffer[j]) { for (--j; j >= 0; j--) kfree(portdata->in_buffer[j]); kfree(portdata); return -ENOMEM; } } usb_set_serial_port_data(port, portdata); /* initialize the in urbs */ for (j = 0; j < N_IN_URB; ++j) { urb = usb_alloc_urb(0, GFP_KERNEL); if (urb == NULL) { dev_dbg(&port->dev, "%s: alloc for in " "port failed.", __func__); continue; } /* Fill URB using supplied data. */ usb_fill_bulk_urb(urb, serial->dev, usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress), portdata->in_buffer[j], IN_BUFLEN, sierra_indat_callback, port); portdata->in_urbs[j] = urb; } } return 0; } static void sierra_shutdown(struct usb_serial *serial) { int i, j; struct usb_serial_port *port; struct sierra_port_private *portdata; dev_dbg(&serial->dev->dev, "%s", __func__); for (i = 0; i < serial->num_ports; ++i) { port = serial->port[i]; if (!port) continue; portdata = usb_get_serial_port_data(port); if (!portdata) continue; for (j = 0; j < N_IN_URB; j++) { usb_kill_urb(portdata->in_urbs[j]); usb_free_urb(portdata->in_urbs[j]); kfree(portdata->in_buffer[j]); } kfree(portdata); usb_set_serial_port_data(port, NULL); } } static struct usb_serial_driver sierra_device = { .driver = { .owner = THIS_MODULE, .name = "sierra", }, .description = "Sierra USB modem", .id_table = id_table, .usb_driver = &sierra_driver, .calc_num_ports = sierra_calc_num_ports, .probe = sierra_probe, .open = sierra_open, .close = sierra_close, .write = sierra_write, .write_room = sierra_write_room, .set_termios = sierra_set_termios, .tiocmget = sierra_tiocmget, .tiocmset = sierra_tiocmset, .attach = sierra_startup, .shutdown = sierra_shutdown, .read_int_callback = sierra_instat_callback, }; /* Functions used by new usb-serial code. */ static int __init sierra_init(void) { int retval; retval = usb_serial_register(&sierra_device); if (retval) goto failed_device_register; retval = usb_register(&sierra_driver); if (retval) goto failed_driver_register; printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" DRIVER_DESC "\n"); return 0; failed_driver_register: usb_serial_deregister(&sierra_device); failed_device_register: return retval; } static void __exit sierra_exit(void) { usb_deregister(&sierra_driver); usb_serial_deregister(&sierra_device); } module_init(sierra_init); module_exit(sierra_exit); MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_VERSION(DRIVER_VERSION); MODULE_LICENSE("GPL"); module_param(nmea, bool, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(nmea, "NMEA streaming"); module_param(debug, bool, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(debug, "Debug messages");