| /* |
| * usblp.c Version 0.13 |
| * |
| * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com> |
| * Copyright (c) 1999 Pavel Machek <pavel@suse.cz> |
| * Copyright (c) 2000 Randy Dunlap <rdunlap@xenotime.net> |
| * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz> |
| # Copyright (c) 2001 Pete Zaitcev <zaitcev@redhat.com> |
| # Copyright (c) 2001 David Paschal <paschal@rcsis.com> |
| * Copyright (c) 2006 Oliver Neukum <oliver@neukum.name> |
| * |
| * USB Printer Device Class driver for USB printers and printer cables |
| * |
| * Sponsored by SuSE |
| * |
| * ChangeLog: |
| * v0.1 - thorough cleaning, URBification, almost a rewrite |
| * v0.2 - some more cleanups |
| * v0.3 - cleaner again, waitqueue fixes |
| * v0.4 - fixes in unidirectional mode |
| * v0.5 - add DEVICE_ID string support |
| * v0.6 - never time out |
| * v0.7 - fixed bulk-IN read and poll (David Paschal) |
| * v0.8 - add devfs support |
| * v0.9 - fix unplug-while-open paths |
| * v0.10- remove sleep_on, fix error on oom (oliver@neukum.org) |
| * v0.11 - add proto_bias option (Pete Zaitcev) |
| * v0.12 - add hpoj.sourceforge.net ioctls (David Paschal) |
| * v0.13 - alloc space for statusbuf (<status> not on stack); |
| * use usb_buffer_alloc() for read buf & write buf; |
| */ |
| |
| /* |
| * This program 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/smp_lock.h> |
| #include <linux/signal.h> |
| #include <linux/poll.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/lp.h> |
| #include <linux/mutex.h> |
| #undef DEBUG |
| #include <linux/usb.h> |
| |
| /* |
| * Version Information |
| */ |
| #define DRIVER_VERSION "v0.13" |
| #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal" |
| #define DRIVER_DESC "USB Printer Device Class driver" |
| |
| #define USBLP_BUF_SIZE 8192 |
| #define USBLP_DEVICE_ID_SIZE 1024 |
| |
| /* ioctls: */ |
| #define LPGETSTATUS 0x060b /* same as in drivers/char/lp.c */ |
| #define IOCNR_GET_DEVICE_ID 1 |
| #define IOCNR_GET_PROTOCOLS 2 |
| #define IOCNR_SET_PROTOCOL 3 |
| #define IOCNR_HP_SET_CHANNEL 4 |
| #define IOCNR_GET_BUS_ADDRESS 5 |
| #define IOCNR_GET_VID_PID 6 |
| #define IOCNR_SOFT_RESET 7 |
| /* Get device_id string: */ |
| #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len) |
| /* The following ioctls were added for http://hpoj.sourceforge.net: */ |
| /* Get two-int array: |
| * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3), |
| * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */ |
| #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len) |
| /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */ |
| #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0) |
| /* Set channel number (HP Vendor-specific command): */ |
| #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0) |
| /* Get two-int array: [0]=bus number, [1]=device address: */ |
| #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len) |
| /* Get two-int array: [0]=vendor ID, [1]=product ID: */ |
| #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len) |
| /* Perform class specific soft reset */ |
| #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0); |
| |
| /* |
| * A DEVICE_ID string may include the printer's serial number. |
| * It should end with a semi-colon (';'). |
| * An example from an HP 970C DeskJet printer is (this is one long string, |
| * with the serial number changed): |
| MFG:HEWLETT-PACKARD;MDL:DESKJET 970C;CMD:MLC,PCL,PML;CLASS:PRINTER;DESCRIPTION:Hewlett-Packard DeskJet 970C;SERN:US970CSEPROF;VSTATUS:$HB0$NC0,ff,DN,IDLE,CUT,K1,C0,DP,NR,KP000,CP027;VP:0800,FL,B0;VJ: ; |
| */ |
| |
| /* |
| * USB Printer Requests |
| */ |
| |
| #define USBLP_REQ_GET_ID 0x00 |
| #define USBLP_REQ_GET_STATUS 0x01 |
| #define USBLP_REQ_RESET 0x02 |
| #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00 /* HP Vendor-specific */ |
| |
| #define USBLP_MINORS 16 |
| #define USBLP_MINOR_BASE 0 |
| |
| #define USBLP_WRITE_TIMEOUT (5000) /* 5 seconds */ |
| |
| #define USBLP_FIRST_PROTOCOL 1 |
| #define USBLP_LAST_PROTOCOL 3 |
| #define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1) |
| |
| /* |
| * some arbitrary status buffer size; |
| * need a status buffer that is allocated via kmalloc(), not on stack |
| */ |
| #define STATUS_BUF_SIZE 8 |
| |
| struct usblp { |
| struct usb_device *dev; /* USB device */ |
| struct mutex mut; /* locks this struct, especially "dev" */ |
| char *writebuf; /* write transfer_buffer */ |
| char *readbuf; /* read transfer_buffer */ |
| char *statusbuf; /* status transfer_buffer */ |
| struct urb *readurb, *writeurb; /* The urbs */ |
| wait_queue_head_t wait; /* Zzzzz ... */ |
| int readcount; /* Counter for reads */ |
| int ifnum; /* Interface number */ |
| struct usb_interface *intf; /* The interface */ |
| /* Alternate-setting numbers and endpoints for each protocol |
| * (7/1/{index=1,2,3}) that the device supports: */ |
| struct { |
| int alt_setting; |
| struct usb_endpoint_descriptor *epwrite; |
| struct usb_endpoint_descriptor *epread; |
| } protocol[USBLP_MAX_PROTOCOLS]; |
| int current_protocol; |
| int minor; /* minor number of device */ |
| int wcomplete; /* writing is completed */ |
| int rcomplete; /* reading is completed */ |
| unsigned int quirks; /* quirks flags */ |
| unsigned char used; /* True if open */ |
| unsigned char present; /* True if not disconnected */ |
| unsigned char bidir; /* interface is bidirectional */ |
| unsigned char sleeping; /* interface is suspended */ |
| unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */ |
| /* first 2 bytes are (big-endian) length */ |
| }; |
| |
| #ifdef DEBUG |
| static void usblp_dump(struct usblp *usblp) { |
| int p; |
| |
| dbg("usblp=0x%p", usblp); |
| dbg("dev=0x%p", usblp->dev); |
| dbg("present=%d", usblp->present); |
| dbg("readbuf=0x%p", usblp->readbuf); |
| dbg("writebuf=0x%p", usblp->writebuf); |
| dbg("readurb=0x%p", usblp->readurb); |
| dbg("writeurb=0x%p", usblp->writeurb); |
| dbg("readcount=%d", usblp->readcount); |
| dbg("ifnum=%d", usblp->ifnum); |
| for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) { |
| dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting); |
| dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite); |
| dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread); |
| } |
| dbg("current_protocol=%d", usblp->current_protocol); |
| dbg("minor=%d", usblp->minor); |
| dbg("wcomplete=%d", usblp->wcomplete); |
| dbg("rcomplete=%d", usblp->rcomplete); |
| dbg("quirks=%d", usblp->quirks); |
| dbg("used=%d", usblp->used); |
| dbg("bidir=%d", usblp->bidir); |
| dbg("sleeping=%d", usblp->sleeping); |
| dbg("device_id_string=\"%s\"", |
| usblp->device_id_string ? |
| usblp->device_id_string + 2 : |
| (unsigned char *)"(null)"); |
| } |
| #endif |
| |
| /* Quirks: various printer quirks are handled by this table & its flags. */ |
| |
| struct quirk_printer_struct { |
| __u16 vendorId; |
| __u16 productId; |
| unsigned int quirks; |
| }; |
| |
| #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */ |
| #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */ |
| |
| static const struct quirk_printer_struct quirk_printers[] = { |
| { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */ |
| { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */ |
| { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */ |
| { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */ |
| { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */ |
| { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */ |
| { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */ |
| { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */ |
| { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */ |
| { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */ |
| { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */ |
| { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */ |
| { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */ |
| { 0, 0 } |
| }; |
| |
| static int usblp_select_alts(struct usblp *usblp); |
| static int usblp_set_protocol(struct usblp *usblp, int protocol); |
| static int usblp_cache_device_id_string(struct usblp *usblp); |
| |
| /* forward reference to make our lives easier */ |
| static struct usb_driver usblp_driver; |
| static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */ |
| |
| /* |
| * Functions for usblp control messages. |
| */ |
| |
| static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len) |
| { |
| int retval; |
| int index = usblp->ifnum; |
| |
| /* High byte has the interface index. |
| Low byte has the alternate setting. |
| */ |
| if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) { |
| index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting; |
| } |
| |
| retval = usb_control_msg(usblp->dev, |
| dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0), |
| request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT); |
| dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d", |
| request, !!dir, recip, value, index, len, retval); |
| return retval < 0 ? retval : 0; |
| } |
| |
| #define usblp_read_status(usblp, status)\ |
| usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1) |
| #define usblp_get_id(usblp, config, id, maxlen)\ |
| usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen) |
| #define usblp_reset(usblp)\ |
| usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0) |
| |
| #define usblp_hp_channel_change_request(usblp, channel, buffer) \ |
| usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1) |
| |
| /* |
| * See the description for usblp_select_alts() below for the usage |
| * explanation. Look into your /proc/bus/usb/devices and dmesg in |
| * case of any trouble. |
| */ |
| static int proto_bias = -1; |
| |
| /* |
| * URB callback. |
| */ |
| |
| static void usblp_bulk_read(struct urb *urb) |
| { |
| struct usblp *usblp = urb->context; |
| |
| if (unlikely(!usblp || !usblp->dev || !usblp->used)) |
| return; |
| |
| if (unlikely(!usblp->present)) |
| goto unplug; |
| if (unlikely(urb->status)) |
| warn("usblp%d: nonzero read/write bulk status received: %d", |
| usblp->minor, urb->status); |
| usblp->rcomplete = 1; |
| unplug: |
| wake_up_interruptible(&usblp->wait); |
| } |
| |
| static void usblp_bulk_write(struct urb *urb) |
| { |
| struct usblp *usblp = urb->context; |
| |
| if (unlikely(!usblp || !usblp->dev || !usblp->used)) |
| return; |
| if (unlikely(!usblp->present)) |
| goto unplug; |
| if (unlikely(urb->status)) |
| warn("usblp%d: nonzero read/write bulk status received: %d", |
| usblp->minor, urb->status); |
| usblp->wcomplete = 1; |
| unplug: |
| wake_up_interruptible(&usblp->wait); |
| } |
| |
| /* |
| * Get and print printer errors. |
| */ |
| |
| static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" }; |
| |
| static int usblp_check_status(struct usblp *usblp, int err) |
| { |
| unsigned char status, newerr = 0; |
| int error; |
| |
| error = usblp_read_status (usblp, usblp->statusbuf); |
| if (error < 0) { |
| if (printk_ratelimit()) |
| err("usblp%d: error %d reading printer status", |
| usblp->minor, error); |
| return 0; |
| } |
| |
| status = *usblp->statusbuf; |
| |
| if (~status & LP_PERRORP) |
| newerr = 3; |
| if (status & LP_POUTPA) |
| newerr = 1; |
| if (~status & LP_PSELECD) |
| newerr = 2; |
| |
| if (newerr != err) |
| info("usblp%d: %s", usblp->minor, usblp_messages[newerr]); |
| |
| return newerr; |
| } |
| |
| static int handle_bidir (struct usblp *usblp) |
| { |
| if (usblp->bidir && usblp->used && !usblp->sleeping) { |
| usblp->readcount = 0; |
| usblp->readurb->dev = usblp->dev; |
| if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) { |
| usblp->used = 0; |
| return -EIO; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * File op functions. |
| */ |
| |
| static int usblp_open(struct inode *inode, struct file *file) |
| { |
| int minor = iminor(inode); |
| struct usblp *usblp; |
| struct usb_interface *intf; |
| int retval; |
| |
| if (minor < 0) |
| return -ENODEV; |
| |
| mutex_lock (&usblp_mutex); |
| |
| retval = -ENODEV; |
| intf = usb_find_interface(&usblp_driver, minor); |
| if (!intf) { |
| goto out; |
| } |
| usblp = usb_get_intfdata (intf); |
| if (!usblp || !usblp->dev || !usblp->present) |
| goto out; |
| |
| retval = -EBUSY; |
| if (usblp->used) |
| goto out; |
| |
| /* |
| * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ??? |
| * This is #if 0-ed because we *don't* want to fail an open |
| * just because the printer is off-line. |
| */ |
| #if 0 |
| if ((retval = usblp_check_status(usblp, 0))) { |
| retval = retval > 1 ? -EIO : -ENOSPC; |
| goto out; |
| } |
| #else |
| retval = 0; |
| #endif |
| |
| usblp->used = 1; |
| file->private_data = usblp; |
| |
| usblp->writeurb->transfer_buffer_length = 0; |
| usblp->wcomplete = 1; /* we begin writeable */ |
| usblp->rcomplete = 0; |
| usblp->writeurb->status = 0; |
| usblp->readurb->status = 0; |
| |
| if (handle_bidir(usblp) < 0) { |
| file->private_data = NULL; |
| retval = -EIO; |
| } |
| out: |
| mutex_unlock (&usblp_mutex); |
| return retval; |
| } |
| |
| static void usblp_cleanup (struct usblp *usblp) |
| { |
| info("usblp%d: removed", usblp->minor); |
| |
| kfree (usblp->device_id_string); |
| kfree (usblp->statusbuf); |
| usb_free_urb(usblp->writeurb); |
| usb_free_urb(usblp->readurb); |
| kfree (usblp); |
| } |
| |
| static void usblp_unlink_urbs(struct usblp *usblp) |
| { |
| usb_kill_urb(usblp->writeurb); |
| if (usblp->bidir) |
| usb_kill_urb(usblp->readurb); |
| } |
| |
| static int usblp_release(struct inode *inode, struct file *file) |
| { |
| struct usblp *usblp = file->private_data; |
| |
| mutex_lock (&usblp_mutex); |
| usblp->used = 0; |
| if (usblp->present) { |
| usblp_unlink_urbs(usblp); |
| } else /* finish cleanup from disconnect */ |
| usblp_cleanup (usblp); |
| mutex_unlock (&usblp_mutex); |
| return 0; |
| } |
| |
| /* No kernel lock - fine */ |
| static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait) |
| { |
| struct usblp *usblp = file->private_data; |
| poll_wait(file, &usblp->wait, wait); |
| return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN | POLLRDNORM) |
| | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM); |
| } |
| |
| static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| { |
| struct usblp *usblp = file->private_data; |
| int length, err, i; |
| unsigned char newChannel; |
| int status; |
| int twoints[2]; |
| int retval = 0; |
| |
| mutex_lock (&usblp->mut); |
| if (!usblp->present) { |
| retval = -ENODEV; |
| goto done; |
| } |
| |
| if (usblp->sleeping) { |
| retval = -ENODEV; |
| goto done; |
| } |
| |
| dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd), |
| _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) ); |
| |
| if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */ |
| |
| switch (_IOC_NR(cmd)) { |
| |
| case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */ |
| if (_IOC_DIR(cmd) != _IOC_READ) { |
| retval = -EINVAL; |
| goto done; |
| } |
| |
| length = usblp_cache_device_id_string(usblp); |
| if (length < 0) { |
| retval = length; |
| goto done; |
| } |
| if (length > _IOC_SIZE(cmd)) |
| length = _IOC_SIZE(cmd); /* truncate */ |
| |
| if (copy_to_user((void __user *) arg, |
| usblp->device_id_string, |
| (unsigned long) length)) { |
| retval = -EFAULT; |
| goto done; |
| } |
| |
| break; |
| |
| case IOCNR_GET_PROTOCOLS: |
| if (_IOC_DIR(cmd) != _IOC_READ || |
| _IOC_SIZE(cmd) < sizeof(twoints)) { |
| retval = -EINVAL; |
| goto done; |
| } |
| |
| twoints[0] = usblp->current_protocol; |
| twoints[1] = 0; |
| for (i = USBLP_FIRST_PROTOCOL; |
| i <= USBLP_LAST_PROTOCOL; i++) { |
| if (usblp->protocol[i].alt_setting >= 0) |
| twoints[1] |= (1<<i); |
| } |
| |
| if (copy_to_user((void __user *)arg, |
| (unsigned char *)twoints, |
| sizeof(twoints))) { |
| retval = -EFAULT; |
| goto done; |
| } |
| |
| break; |
| |
| case IOCNR_SET_PROTOCOL: |
| if (_IOC_DIR(cmd) != _IOC_WRITE) { |
| retval = -EINVAL; |
| goto done; |
| } |
| |
| #ifdef DEBUG |
| if (arg == -10) { |
| usblp_dump(usblp); |
| break; |
| } |
| #endif |
| |
| usblp_unlink_urbs(usblp); |
| retval = usblp_set_protocol(usblp, arg); |
| if (retval < 0) { |
| usblp_set_protocol(usblp, |
| usblp->current_protocol); |
| } |
| break; |
| |
| case IOCNR_HP_SET_CHANNEL: |
| if (_IOC_DIR(cmd) != _IOC_WRITE || |
| le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 || |
| usblp->quirks & USBLP_QUIRK_BIDIR) { |
| retval = -EINVAL; |
| goto done; |
| } |
| |
| err = usblp_hp_channel_change_request(usblp, |
| arg, &newChannel); |
| if (err < 0) { |
| err("usblp%d: error = %d setting " |
| "HP channel", |
| usblp->minor, err); |
| retval = -EIO; |
| goto done; |
| } |
| |
| dbg("usblp%d requested/got HP channel %ld/%d", |
| usblp->minor, arg, newChannel); |
| break; |
| |
| case IOCNR_GET_BUS_ADDRESS: |
| if (_IOC_DIR(cmd) != _IOC_READ || |
| _IOC_SIZE(cmd) < sizeof(twoints)) { |
| retval = -EINVAL; |
| goto done; |
| } |
| |
| twoints[0] = usblp->dev->bus->busnum; |
| twoints[1] = usblp->dev->devnum; |
| if (copy_to_user((void __user *)arg, |
| (unsigned char *)twoints, |
| sizeof(twoints))) { |
| retval = -EFAULT; |
| goto done; |
| } |
| |
| dbg("usblp%d is bus=%d, device=%d", |
| usblp->minor, twoints[0], twoints[1]); |
| break; |
| |
| case IOCNR_GET_VID_PID: |
| if (_IOC_DIR(cmd) != _IOC_READ || |
| _IOC_SIZE(cmd) < sizeof(twoints)) { |
| retval = -EINVAL; |
| goto done; |
| } |
| |
| twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor); |
| twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct); |
| if (copy_to_user((void __user *)arg, |
| (unsigned char *)twoints, |
| sizeof(twoints))) { |
| retval = -EFAULT; |
| goto done; |
| } |
| |
| dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X", |
| usblp->minor, twoints[0], twoints[1]); |
| break; |
| |
| case IOCNR_SOFT_RESET: |
| if (_IOC_DIR(cmd) != _IOC_NONE) { |
| retval = -EINVAL; |
| goto done; |
| } |
| retval = usblp_reset(usblp); |
| break; |
| default: |
| retval = -ENOTTY; |
| } |
| else /* old-style ioctl value */ |
| switch (cmd) { |
| |
| case LPGETSTATUS: |
| if (usblp_read_status(usblp, usblp->statusbuf)) { |
| if (printk_ratelimit()) |
| err("usblp%d: failed reading printer status", |
| usblp->minor); |
| retval = -EIO; |
| goto done; |
| } |
| status = *usblp->statusbuf; |
| if (copy_to_user ((void __user *)arg, &status, sizeof(int))) |
| retval = -EFAULT; |
| break; |
| |
| default: |
| retval = -ENOTTY; |
| } |
| |
| done: |
| mutex_unlock (&usblp->mut); |
| return retval; |
| } |
| |
| static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
| { |
| struct usblp *usblp = file->private_data; |
| int timeout, intr, rv, err = 0, transfer_length = 0; |
| size_t writecount = 0; |
| |
| while (writecount < count) { |
| if (!usblp->wcomplete) { |
| barrier(); |
| if (file->f_flags & O_NONBLOCK) { |
| writecount += transfer_length; |
| return writecount ? writecount : -EAGAIN; |
| } |
| |
| timeout = USBLP_WRITE_TIMEOUT; |
| |
| rv = wait_event_interruptible_timeout(usblp->wait, usblp->wcomplete || !usblp->present , timeout); |
| if (rv < 0) |
| return writecount ? writecount : -EINTR; |
| } |
| intr = mutex_lock_interruptible (&usblp->mut); |
| if (intr) |
| return writecount ? writecount : -EINTR; |
| if (!usblp->present) { |
| mutex_unlock (&usblp->mut); |
| return -ENODEV; |
| } |
| |
| if (usblp->sleeping) { |
| mutex_unlock (&usblp->mut); |
| return writecount ? writecount : -ENODEV; |
| } |
| |
| if (usblp->writeurb->status != 0) { |
| if (usblp->quirks & USBLP_QUIRK_BIDIR) { |
| if (!usblp->wcomplete) |
| err("usblp%d: error %d writing to printer", |
| usblp->minor, usblp->writeurb->status); |
| err = usblp->writeurb->status; |
| } else |
| err = usblp_check_status(usblp, err); |
| mutex_unlock (&usblp->mut); |
| |
| /* if the fault was due to disconnect, let khubd's |
| * call to usblp_disconnect() grab usblp->mut ... |
| */ |
| schedule (); |
| continue; |
| } |
| |
| /* We must increment writecount here, and not at the |
| * end of the loop. Otherwise, the final loop iteration may |
| * be skipped, leading to incomplete printer output. |
| */ |
| writecount += transfer_length; |
| if (writecount == count) { |
| mutex_unlock(&usblp->mut); |
| break; |
| } |
| |
| transfer_length=(count - writecount); |
| if (transfer_length > USBLP_BUF_SIZE) |
| transfer_length = USBLP_BUF_SIZE; |
| |
| usblp->writeurb->transfer_buffer_length = transfer_length; |
| |
| if (copy_from_user(usblp->writeurb->transfer_buffer, |
| buffer + writecount, transfer_length)) { |
| mutex_unlock(&usblp->mut); |
| return writecount ? writecount : -EFAULT; |
| } |
| |
| usblp->writeurb->dev = usblp->dev; |
| usblp->wcomplete = 0; |
| err = usb_submit_urb(usblp->writeurb, GFP_KERNEL); |
| if (err) { |
| usblp->wcomplete = 1; |
| if (err != -ENOMEM) |
| count = -EIO; |
| else |
| count = writecount ? writecount : -ENOMEM; |
| mutex_unlock (&usblp->mut); |
| break; |
| } |
| mutex_unlock (&usblp->mut); |
| } |
| |
| return count; |
| } |
| |
| static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) |
| { |
| struct usblp *usblp = file->private_data; |
| int rv, intr; |
| |
| if (!usblp->bidir) |
| return -EINVAL; |
| |
| intr = mutex_lock_interruptible (&usblp->mut); |
| if (intr) |
| return -EINTR; |
| if (!usblp->present) { |
| count = -ENODEV; |
| goto done; |
| } |
| |
| if (!usblp->rcomplete) { |
| barrier(); |
| |
| if (file->f_flags & O_NONBLOCK) { |
| count = -EAGAIN; |
| goto done; |
| } |
| mutex_unlock(&usblp->mut); |
| rv = wait_event_interruptible(usblp->wait, usblp->rcomplete || !usblp->present); |
| mutex_lock(&usblp->mut); |
| if (rv < 0) { |
| count = -EINTR; |
| goto done; |
| } |
| } |
| |
| if (!usblp->present) { |
| count = -ENODEV; |
| goto done; |
| } |
| |
| if (usblp->sleeping) { |
| count = -ENODEV; |
| goto done; |
| } |
| |
| if (usblp->readurb->status) { |
| err("usblp%d: error %d reading from printer", |
| usblp->minor, usblp->readurb->status); |
| usblp->readurb->dev = usblp->dev; |
| usblp->readcount = 0; |
| usblp->rcomplete = 0; |
| if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) |
| dbg("error submitting urb"); |
| count = -EIO; |
| goto done; |
| } |
| |
| count = count < usblp->readurb->actual_length - usblp->readcount ? |
| count : usblp->readurb->actual_length - usblp->readcount; |
| |
| if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) { |
| count = -EFAULT; |
| goto done; |
| } |
| |
| if ((usblp->readcount += count) == usblp->readurb->actual_length) { |
| usblp->readcount = 0; |
| usblp->readurb->dev = usblp->dev; |
| usblp->rcomplete = 0; |
| if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) { |
| count = -EIO; |
| goto done; |
| } |
| } |
| |
| done: |
| mutex_unlock (&usblp->mut); |
| return count; |
| } |
| |
| /* |
| * Checks for printers that have quirks, such as requiring unidirectional |
| * communication but reporting bidirectional; currently some HP printers |
| * have this flaw (HP 810, 880, 895, etc.), or needing an init string |
| * sent at each open (like some Epsons). |
| * Returns 1 if found, 0 if not found. |
| * |
| * HP recommended that we use the bidirectional interface but |
| * don't attempt any bulk IN transfers from the IN endpoint. |
| * Here's some more detail on the problem: |
| * The problem is not that it isn't bidirectional though. The problem |
| * is that if you request a device ID, or status information, while |
| * the buffers are full, the return data will end up in the print data |
| * buffer. For example if you make sure you never request the device ID |
| * while you are sending print data, and you don't try to query the |
| * printer status every couple of milliseconds, you will probably be OK. |
| */ |
| static unsigned int usblp_quirks (__u16 vendor, __u16 product) |
| { |
| int i; |
| |
| for (i = 0; quirk_printers[i].vendorId; i++) { |
| if (vendor == quirk_printers[i].vendorId && |
| product == quirk_printers[i].productId) |
| return quirk_printers[i].quirks; |
| } |
| return 0; |
| } |
| |
| static const struct file_operations usblp_fops = { |
| .owner = THIS_MODULE, |
| .read = usblp_read, |
| .write = usblp_write, |
| .poll = usblp_poll, |
| .unlocked_ioctl = usblp_ioctl, |
| .compat_ioctl = usblp_ioctl, |
| .open = usblp_open, |
| .release = usblp_release, |
| }; |
| |
| static struct usb_class_driver usblp_class = { |
| .name = "lp%d", |
| .fops = &usblp_fops, |
| .minor_base = USBLP_MINOR_BASE, |
| }; |
| |
| static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct usb_interface *intf = to_usb_interface(dev); |
| struct usblp *usblp = usb_get_intfdata (intf); |
| |
| if (usblp->device_id_string[0] == 0 && |
| usblp->device_id_string[1] == 0) |
| return 0; |
| |
| return sprintf(buf, "%s", usblp->device_id_string+2); |
| } |
| |
| static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL); |
| |
| static int usblp_probe(struct usb_interface *intf, |
| const struct usb_device_id *id) |
| { |
| struct usb_device *dev = interface_to_usbdev (intf); |
| struct usblp *usblp = NULL; |
| int protocol; |
| int retval; |
| |
| /* Malloc and start initializing usblp structure so we can use it |
| * directly. */ |
| if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) { |
| err("out of memory for usblp"); |
| goto abort; |
| } |
| usblp->dev = dev; |
| mutex_init (&usblp->mut); |
| init_waitqueue_head(&usblp->wait); |
| usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; |
| usblp->intf = intf; |
| |
| usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!usblp->writeurb) { |
| err("out of memory"); |
| goto abort; |
| } |
| usblp->readurb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!usblp->readurb) { |
| err("out of memory"); |
| goto abort; |
| } |
| |
| /* Malloc device ID string buffer to the largest expected length, |
| * since we can re-query it on an ioctl and a dynamic string |
| * could change in length. */ |
| if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) { |
| err("out of memory for device_id_string"); |
| goto abort; |
| } |
| |
| usblp->writebuf = usblp->readbuf = NULL; |
| usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
| usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
| /* Malloc write & read buffers. We somewhat wastefully |
| * malloc both regardless of bidirectionality, because the |
| * alternate setting can be changed later via an ioctl. */ |
| if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE, |
| GFP_KERNEL, &usblp->writeurb->transfer_dma))) { |
| err("out of memory for write buf"); |
| goto abort; |
| } |
| if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE, |
| GFP_KERNEL, &usblp->readurb->transfer_dma))) { |
| err("out of memory for read buf"); |
| goto abort; |
| } |
| |
| /* Allocate buffer for printer status */ |
| usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL); |
| if (!usblp->statusbuf) { |
| err("out of memory for statusbuf"); |
| goto abort; |
| } |
| |
| /* Lookup quirks for this printer. */ |
| usblp->quirks = usblp_quirks( |
| le16_to_cpu(dev->descriptor.idVendor), |
| le16_to_cpu(dev->descriptor.idProduct)); |
| |
| /* Analyze and pick initial alternate settings and endpoints. */ |
| protocol = usblp_select_alts(usblp); |
| if (protocol < 0) { |
| dbg("incompatible printer-class device 0x%4.4X/0x%4.4X", |
| le16_to_cpu(dev->descriptor.idVendor), |
| le16_to_cpu(dev->descriptor.idProduct)); |
| goto abort; |
| } |
| |
| /* Setup the selected alternate setting and endpoints. */ |
| if (usblp_set_protocol(usblp, protocol) < 0) |
| goto abort; |
| |
| /* Retrieve and store the device ID string. */ |
| usblp_cache_device_id_string(usblp); |
| retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id); |
| if (retval) |
| goto abort_intfdata; |
| |
| #ifdef DEBUG |
| usblp_check_status(usblp, 0); |
| #endif |
| |
| usb_set_intfdata (intf, usblp); |
| |
| usblp->present = 1; |
| |
| retval = usb_register_dev(intf, &usblp_class); |
| if (retval) { |
| err("Not able to get a minor for this device."); |
| goto abort_intfdata; |
| } |
| usblp->minor = intf->minor; |
| info("usblp%d: USB %sdirectional printer dev %d " |
| "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X", |
| usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum, |
| usblp->ifnum, |
| usblp->protocol[usblp->current_protocol].alt_setting, |
| usblp->current_protocol, |
| le16_to_cpu(usblp->dev->descriptor.idVendor), |
| le16_to_cpu(usblp->dev->descriptor.idProduct)); |
| |
| return 0; |
| |
| abort_intfdata: |
| usb_set_intfdata (intf, NULL); |
| device_remove_file(&intf->dev, &dev_attr_ieee1284_id); |
| abort: |
| if (usblp) { |
| if (usblp->writebuf) |
| usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, |
| usblp->writebuf, usblp->writeurb->transfer_dma); |
| if (usblp->readbuf) |
| usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, |
| usblp->readbuf, usblp->writeurb->transfer_dma); |
| kfree(usblp->statusbuf); |
| kfree(usblp->device_id_string); |
| usb_free_urb(usblp->writeurb); |
| usb_free_urb(usblp->readurb); |
| kfree(usblp); |
| } |
| return -EIO; |
| } |
| |
| /* |
| * We are a "new" style driver with usb_device_id table, |
| * but our requirements are too intricate for simple match to handle. |
| * |
| * The "proto_bias" option may be used to specify the preferred protocol |
| * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3). If the device |
| * supports the preferred protocol, then we bind to it. |
| * |
| * The best interface for us is 7/1/2, because it is compatible |
| * with a stream of characters. If we find it, we bind to it. |
| * |
| * Note that the people from hpoj.sourceforge.net need to be able to |
| * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose. |
| * |
| * Failing 7/1/2, we look for 7/1/3, even though it's probably not |
| * stream-compatible, because this matches the behaviour of the old code. |
| * |
| * If nothing else, we bind to 7/1/1 - the unidirectional interface. |
| */ |
| static int usblp_select_alts(struct usblp *usblp) |
| { |
| struct usb_interface *if_alt; |
| struct usb_host_interface *ifd; |
| struct usb_endpoint_descriptor *epd, *epwrite, *epread; |
| int p, i, e; |
| |
| if_alt = usblp->intf; |
| |
| for (p = 0; p < USBLP_MAX_PROTOCOLS; p++) |
| usblp->protocol[p].alt_setting = -1; |
| |
| /* Find out what we have. */ |
| for (i = 0; i < if_alt->num_altsetting; i++) { |
| ifd = &if_alt->altsetting[i]; |
| |
| if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1) |
| continue; |
| |
| if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL || |
| ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL) |
| continue; |
| |
| /* Look for bulk OUT and IN endpoints. */ |
| epwrite = epread = NULL; |
| for (e = 0; e < ifd->desc.bNumEndpoints; e++) { |
| epd = &ifd->endpoint[e].desc; |
| |
| if (usb_endpoint_is_bulk_out(epd)) |
| if (!epwrite) |
| epwrite = epd; |
| |
| if (usb_endpoint_is_bulk_in(epd)) |
| if (!epread) |
| epread = epd; |
| } |
| |
| /* Ignore buggy hardware without the right endpoints. */ |
| if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread)) |
| continue; |
| |
| /* Turn off reads for 7/1/1 (unidirectional) interfaces |
| * and buggy bidirectional printers. */ |
| if (ifd->desc.bInterfaceProtocol == 1) { |
| epread = NULL; |
| } else if (usblp->quirks & USBLP_QUIRK_BIDIR) { |
| info("Disabling reads from problem bidirectional " |
| "printer on usblp%d", usblp->minor); |
| epread = NULL; |
| } |
| |
| usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting = |
| ifd->desc.bAlternateSetting; |
| usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite; |
| usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread; |
| } |
| |
| /* If our requested protocol is supported, then use it. */ |
| if (proto_bias >= USBLP_FIRST_PROTOCOL && |
| proto_bias <= USBLP_LAST_PROTOCOL && |
| usblp->protocol[proto_bias].alt_setting != -1) |
| return proto_bias; |
| |
| /* Ordering is important here. */ |
| if (usblp->protocol[2].alt_setting != -1) |
| return 2; |
| if (usblp->protocol[1].alt_setting != -1) |
| return 1; |
| if (usblp->protocol[3].alt_setting != -1) |
| return 3; |
| |
| /* If nothing is available, then don't bind to this device. */ |
| return -1; |
| } |
| |
| static int usblp_set_protocol(struct usblp *usblp, int protocol) |
| { |
| int r, alts; |
| |
| if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL) |
| return -EINVAL; |
| |
| alts = usblp->protocol[protocol].alt_setting; |
| if (alts < 0) |
| return -EINVAL; |
| r = usb_set_interface(usblp->dev, usblp->ifnum, alts); |
| if (r < 0) { |
| err("can't set desired altsetting %d on interface %d", |
| alts, usblp->ifnum); |
| return r; |
| } |
| |
| usb_fill_bulk_urb(usblp->writeurb, usblp->dev, |
| usb_sndbulkpipe(usblp->dev, |
| usblp->protocol[protocol].epwrite->bEndpointAddress), |
| usblp->writebuf, 0, |
| usblp_bulk_write, usblp); |
| |
| usblp->bidir = (usblp->protocol[protocol].epread != NULL); |
| if (usblp->bidir) |
| usb_fill_bulk_urb(usblp->readurb, usblp->dev, |
| usb_rcvbulkpipe(usblp->dev, |
| usblp->protocol[protocol].epread->bEndpointAddress), |
| usblp->readbuf, USBLP_BUF_SIZE, |
| usblp_bulk_read, usblp); |
| |
| usblp->current_protocol = protocol; |
| dbg("usblp%d set protocol %d", usblp->minor, protocol); |
| return 0; |
| } |
| |
| /* Retrieves and caches device ID string. |
| * Returns length, including length bytes but not null terminator. |
| * On error, returns a negative errno value. */ |
| static int usblp_cache_device_id_string(struct usblp *usblp) |
| { |
| int err, length; |
| |
| err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1); |
| if (err < 0) { |
| dbg("usblp%d: error = %d reading IEEE-1284 Device ID string", |
| usblp->minor, err); |
| usblp->device_id_string[0] = usblp->device_id_string[1] = '\0'; |
| return -EIO; |
| } |
| |
| /* First two bytes are length in big-endian. |
| * They count themselves, and we copy them into |
| * the user's buffer. */ |
| length = be16_to_cpu(*((__be16 *)usblp->device_id_string)); |
| if (length < 2) |
| length = 2; |
| else if (length >= USBLP_DEVICE_ID_SIZE) |
| length = USBLP_DEVICE_ID_SIZE - 1; |
| usblp->device_id_string[length] = '\0'; |
| |
| dbg("usblp%d Device ID string [len=%d]=\"%s\"", |
| usblp->minor, length, &usblp->device_id_string[2]); |
| |
| return length; |
| } |
| |
| static void usblp_disconnect(struct usb_interface *intf) |
| { |
| struct usblp *usblp = usb_get_intfdata (intf); |
| |
| usb_deregister_dev(intf, &usblp_class); |
| |
| if (!usblp || !usblp->dev) { |
| err("bogus disconnect"); |
| BUG (); |
| } |
| |
| device_remove_file(&intf->dev, &dev_attr_ieee1284_id); |
| |
| mutex_lock (&usblp_mutex); |
| mutex_lock (&usblp->mut); |
| usblp->present = 0; |
| usb_set_intfdata (intf, NULL); |
| |
| usblp_unlink_urbs(usblp); |
| usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, |
| usblp->writebuf, usblp->writeurb->transfer_dma); |
| usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, |
| usblp->readbuf, usblp->readurb->transfer_dma); |
| mutex_unlock (&usblp->mut); |
| |
| if (!usblp->used) |
| usblp_cleanup (usblp); |
| mutex_unlock (&usblp_mutex); |
| } |
| |
| static int usblp_suspend (struct usb_interface *intf, pm_message_t message) |
| { |
| struct usblp *usblp = usb_get_intfdata (intf); |
| |
| /* this races against normal access and open */ |
| mutex_lock (&usblp_mutex); |
| mutex_lock (&usblp->mut); |
| /* we take no more IO */ |
| usblp->sleeping = 1; |
| usblp_unlink_urbs(usblp); |
| mutex_unlock (&usblp->mut); |
| mutex_unlock (&usblp_mutex); |
| |
| return 0; |
| } |
| |
| static int usblp_resume (struct usb_interface *intf) |
| { |
| struct usblp *usblp = usb_get_intfdata (intf); |
| int r; |
| |
| mutex_lock (&usblp_mutex); |
| mutex_lock (&usblp->mut); |
| |
| usblp->sleeping = 0; |
| r = handle_bidir (usblp); |
| |
| mutex_unlock (&usblp->mut); |
| mutex_unlock (&usblp_mutex); |
| |
| return r; |
| } |
| |
| static struct usb_device_id usblp_ids [] = { |
| { USB_DEVICE_INFO(7, 1, 1) }, |
| { USB_DEVICE_INFO(7, 1, 2) }, |
| { USB_DEVICE_INFO(7, 1, 3) }, |
| { USB_INTERFACE_INFO(7, 1, 1) }, |
| { USB_INTERFACE_INFO(7, 1, 2) }, |
| { USB_INTERFACE_INFO(7, 1, 3) }, |
| { } /* Terminating entry */ |
| }; |
| |
| MODULE_DEVICE_TABLE (usb, usblp_ids); |
| |
| static struct usb_driver usblp_driver = { |
| .name = "usblp", |
| .probe = usblp_probe, |
| .disconnect = usblp_disconnect, |
| .suspend = usblp_suspend, |
| .resume = usblp_resume, |
| .id_table = usblp_ids, |
| }; |
| |
| static int __init usblp_init(void) |
| { |
| int retval; |
| retval = usb_register(&usblp_driver); |
| if (!retval) |
| info(DRIVER_VERSION ": " DRIVER_DESC); |
| |
| return retval; |
| } |
| |
| static void __exit usblp_exit(void) |
| { |
| usb_deregister(&usblp_driver); |
| } |
| |
| module_init(usblp_init); |
| module_exit(usblp_exit); |
| |
| MODULE_AUTHOR( DRIVER_AUTHOR ); |
| MODULE_DESCRIPTION( DRIVER_DESC ); |
| module_param(proto_bias, int, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(proto_bias, "Favourite protocol number"); |
| MODULE_LICENSE("GPL"); |