printer.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:29k
- /*
- * printer.c Version 0.11
- *
- * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com>
- * Copyright (c) 1999 Pavel Machek <pavel@suse.cz>
- * Copyright (c) 2000 Randy Dunlap <randy.dunlap@intel.com>
- * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
- # Copyright (c) 2001 Pete Zaitcev <zaitcev@redhat.com>
- # Copyright (c) 2001 David Paschal <paschal@rcsis.com>
- *
- * 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 - add proto_bias option (Pete Zaitcev)
- * v0.11 - add hpoj.sourceforge.net ioctls (David Paschal)
- */
- /*
- * 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/devfs_fs_kernel.h>
- #undef DEBUG
- #include <linux/usb.h>
- /*
- * Version Information
- */
- #define DRIVER_VERSION "v0.11"
- #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 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
- /* 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)
- /*
- * 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 (5*HZ) /* 5 seconds */
- #define USBLP_FIRST_PROTOCOL 1
- #define USBLP_LAST_PROTOCOL 3
- #define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1)
- struct usblp {
- struct usb_device *dev; /* USB device */
- devfs_handle_t devfs; /* devfs device */
- struct semaphore sem; /* locks this struct, especially "dev" */
- char *buf; /* writeurb.transfer_buffer */
- struct urb readurb, writeurb; /* The urbs */
- wait_queue_head_t wait; /* Zzzzz ... */
- int readcount; /* Counter for reads */
- int ifnum; /* Interface number */
- /* 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 */
- unsigned int quirks; /* quirks flags */
- unsigned char used; /* True if open */
- unsigned char bidir; /* interface is bidirectional */
- 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("devfs=0x%p", usblp->devfs);
- dbg("buf=0x%p", usblp->buf);
- 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("quirks=%d", usblp->quirks);
- dbg("used=%d", usblp->used);
- dbg("bidir=%d", usblp->bidir);
- dbg("device_id_string="%s"",
- usblp->device_id_string ?
- usblp->device_id_string + 2 :
- (unsigned char *)"(null)");
- }
- #endif
- extern devfs_handle_t usb_devfs_handle; /* /dev/usb dir. */
- static struct usblp *usblp_table[USBLP_MINORS];
- /* 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 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);
- /*
- * 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 = usb_control_msg(usblp->dev,
- dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
- request, type | dir | recip, value, usblp->ifnum, buf, len, USBLP_WRITE_TIMEOUT);
- dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d len: %#x result: %d",
- request, !!dir, recip, value, 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(struct urb *urb)
- {
- struct usblp *usblp = urb->context;
- if (!usblp || !usblp->dev || !usblp->used)
- return;
- if (urb->status)
- warn("usblp%d: nonzero read/write bulk status received: %d",
- usblp->minor, urb->status);
- wake_up_interruptible(&usblp->wait);
- }
- /*
- * Get and print printer errors.
- */
- static char *usblp_messages[] = { "ok", "out of paper", "off-line", "unknown error" };
- static int usblp_check_status(struct usblp *usblp, int err)
- {
- unsigned char status, newerr = 0;
- int error;
- error = usblp_read_status (usblp, &status);
- if (error < 0) {
- err("usblp%d: error %d reading printer status",
- usblp->minor, error);
- return 0;
- }
- 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;
- }
- /*
- * File op functions.
- */
- static int usblp_open(struct inode *inode, struct file *file)
- {
- int minor = MINOR(inode->i_rdev) - USBLP_MINOR_BASE;
- struct usblp *usblp;
- int retval;
- if (minor < 0 || minor >= USBLP_MINORS)
- return -ENODEV;
- lock_kernel();
- usblp = usblp_table[minor];
- retval = -ENODEV;
- if (!usblp || !usblp->dev)
- 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->writeurb.status = 0;
- if (usblp->bidir) {
- usblp->readcount = 0;
- usblp->readurb.dev = usblp->dev;
- if (usb_submit_urb(&usblp->readurb) < 0) {
- retval = -EIO;
- usblp->used = 0;
- file->private_data = NULL;
- }
- }
- out:
- unlock_kernel();
- return retval;
- }
- static void usblp_cleanup (struct usblp *usblp)
- {
- devfs_unregister (usblp->devfs);
- usblp_table [usblp->minor] = NULL;
- info("usblp%d: removed", usblp->minor);
- kfree (usblp->writeurb.transfer_buffer);
- kfree (usblp->device_id_string);
- kfree (usblp);
- }
- static void usblp_unlink_urbs(struct usblp *usblp)
- {
- usb_unlink_urb(&usblp->writeurb);
- if (usblp->bidir)
- usb_unlink_urb(&usblp->readurb);
- }
- static int usblp_release(struct inode *inode, struct file *file)
- {
- struct usblp *usblp = file->private_data;
- down (&usblp->sem);
- lock_kernel();
- usblp->used = 0;
- if (usblp->dev) {
- usblp_unlink_urbs(usblp);
- up(&usblp->sem);
- } else /* finish cleanup from disconnect */
- usblp_cleanup (usblp);
- unlock_kernel();
- 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->readurb.status == -EINPROGRESS) ? 0 : POLLIN | POLLRDNORM)
- | (usblp->writeurb.status == -EINPROGRESS ? 0 : POLLOUT | POLLWRNORM);
- }
- static int usblp_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
- {
- struct usblp *usblp = file->private_data;
- int length, err, i;
- unsigned char lpstatus, newChannel;
- int status;
- int twoints[2];
- int retval = 0;
- down (&usblp->sem);
- if (!usblp->dev) {
- retval = -ENODEV;
- goto done;
- }
- 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((unsigned char *) 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((unsigned char *)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 ||
- 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((unsigned char *)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] = usblp->dev->descriptor.idVendor;
- twoints[1] = usblp->dev->descriptor.idProduct;
- if (copy_to_user((unsigned char *)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;
- default:
- retval = -EINVAL;
- }
- else /* old-style ioctl value */
- switch (cmd) {
- case LPGETSTATUS:
- if (usblp_read_status(usblp, &lpstatus)) {
- err("usblp%d: failed reading printer status", usblp->minor);
- retval = -EIO;
- goto done;
- }
- status = lpstatus;
- if (copy_to_user ((int *)arg, &status, sizeof(int)))
- retval = -EFAULT;
- break;
- default:
- retval = -EINVAL;
- }
- done:
- up (&usblp->sem);
- return retval;
- }
- static ssize_t usblp_write(struct file *file, const char *buffer, size_t count, loff_t *ppos)
- {
- struct usblp *usblp = file->private_data;
- int timeout, err = 0;
- size_t writecount = 0;
- while (writecount < count) {
- // FIXME: only use urb->status inside completion
- // callbacks; this way is racey...
- if (usblp->writeurb.status == -EINPROGRESS) {
- if (file->f_flags & O_NONBLOCK)
- return -EAGAIN;
- timeout = USBLP_WRITE_TIMEOUT;
- while (timeout && usblp->writeurb.status == -EINPROGRESS) {
- if (signal_pending(current))
- return writecount ? writecount : -EINTR;
- timeout = interruptible_sleep_on_timeout(&usblp->wait, timeout);
- }
- }
- down (&usblp->sem);
- if (!usblp->dev) {
- up (&usblp->sem);
- return -ENODEV;
- }
- if (usblp->writeurb.status != 0) {
- if (usblp->quirks & USBLP_QUIRK_BIDIR) {
- if (usblp->writeurb.status != -EINPROGRESS)
- err("usblp%d: error %d writing to printer",
- usblp->minor, usblp->writeurb.status);
- err = usblp->writeurb.status;
- } else
- err = usblp_check_status(usblp, err);
- up (&usblp->sem);
- /* if the fault was due to disconnect, let khubd's
- * call to usblp_disconnect() grab usblp->sem ...
- */
- schedule ();
- continue;
- }
- writecount += usblp->writeurb.transfer_buffer_length;
- usblp->writeurb.transfer_buffer_length = 0;
- if (writecount == count) {
- up (&usblp->sem);
- break;
- }
- usblp->writeurb.transfer_buffer_length = (count - writecount) < USBLP_BUF_SIZE ?
- (count - writecount) : USBLP_BUF_SIZE;
- if (copy_from_user(usblp->writeurb.transfer_buffer, buffer + writecount,
- usblp->writeurb.transfer_buffer_length)) {
- up(&usblp->sem);
- return writecount ? writecount : -EFAULT;
- }
- usblp->writeurb.dev = usblp->dev;
- usb_submit_urb(&usblp->writeurb);
- up (&usblp->sem);
- }
- return count;
- }
- static ssize_t usblp_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
- {
- struct usblp *usblp = file->private_data;
- if (!usblp->bidir)
- return -EINVAL;
- down (&usblp->sem);
- if (!usblp->dev) {
- count = -ENODEV;
- goto done;
- }
- if (usblp->readurb.status == -EINPROGRESS) {
- if (file->f_flags & O_NONBLOCK) {
- count = -EAGAIN;
- goto done;
- }
- // FIXME: only use urb->status inside completion
- // callbacks; this way is racey...
- while (usblp->readurb.status == -EINPROGRESS) {
- if (signal_pending(current)) {
- count = -EINTR;
- goto done;
- }
- up (&usblp->sem);
- interruptible_sleep_on(&usblp->wait);
- down (&usblp->sem);
- }
- }
- if (!usblp->dev) {
- 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;
- usb_submit_urb(&usblp->readurb);
- 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;
- usb_submit_urb(&usblp->readurb);
- }
- done:
- up (&usblp->sem);
- 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 struct file_operations usblp_fops = {
- owner: THIS_MODULE,
- read: usblp_read,
- write: usblp_write,
- poll: usblp_poll,
- ioctl: usblp_ioctl,
- open: usblp_open,
- release: usblp_release,
- };
- static void *usblp_probe(struct usb_device *dev, unsigned int ifnum,
- const struct usb_device_id *id)
- {
- struct usblp *usblp = 0;
- int protocol;
- char name[6];
- /* Malloc and start initializing usblp structure so we can use it
- * directly. */
- if (!(usblp = kmalloc(sizeof(struct usblp), GFP_KERNEL))) {
- err("out of memory for usblp");
- goto abort;
- }
- memset(usblp, 0, sizeof(struct usblp));
- usblp->dev = dev;
- init_MUTEX (&usblp->sem);
- init_waitqueue_head(&usblp->wait);
- usblp->ifnum = ifnum;
- /* Look for a free usblp_table entry. */
- while (usblp_table[usblp->minor]) {
- usblp->minor++;
- if (usblp->minor >= USBLP_MINORS) {
- err("no more free usblp devices");
- 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(DEVICE_ID_SIZE, GFP_KERNEL))) {
- err("out of memory for device_id_string");
- goto abort;
- }
- /* Malloc write/read buffers in one chunk. We somewhat wastefully
- * malloc both regardless of bidirectionality, because the
- * alternate setting can be changed later via an ioctl. */
- if (!(usblp->buf = kmalloc(2 * USBLP_BUF_SIZE, GFP_KERNEL))) {
- err("out of memory for buf");
- goto abort;
- }
- /* Lookup quirks for this printer. */
- usblp->quirks = usblp_quirks(
- dev->descriptor.idVendor,
- 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",
- dev->descriptor.idVendor,
- 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);
- #ifdef DEBUG
- usblp_check_status(usblp, 0);
- #endif
- usblp_table[usblp->minor] = usblp;
- /* If we have devfs, create with perms=660. */
- sprintf(name, "lp%d", usblp->minor);
- usblp->devfs = devfs_register(usb_devfs_handle, name,
- DEVFS_FL_DEFAULT, USB_MAJOR,
- USBLP_MINOR_BASE + usblp->minor,
- S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP |
- S_IWGRP, &usblp_fops, NULL);
- 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, ifnum,
- usblp->protocol[usblp->current_protocol].alt_setting,
- usblp->current_protocol, usblp->dev->descriptor.idVendor,
- usblp->dev->descriptor.idProduct);
- return usblp;
- abort:
- if (usblp) {
- if (usblp->buf) kfree(usblp->buf);
- if (usblp->device_id_string) kfree(usblp->device_id_string);
- kfree(usblp);
- }
- return NULL;
- }
- /*
- * 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_interface_descriptor *ifd;
- struct usb_endpoint_descriptor *epd, *epwrite, *epread;
- int p, i, e;
- if_alt = &usblp->dev->actconfig->interface[usblp->ifnum];
- 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->bInterfaceClass != 7 || ifd->bInterfaceSubClass != 1)
- continue;
- if (ifd->bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
- ifd->bInterfaceProtocol > USBLP_LAST_PROTOCOL)
- continue;
- /* Look for bulk OUT and IN endpoints. */
- epwrite = epread = 0;
- for (e = 0; e < ifd->bNumEndpoints; e++) {
- epd = &ifd->endpoint[e];
- if ((epd->bmAttributes&USB_ENDPOINT_XFERTYPE_MASK)!=
- USB_ENDPOINT_XFER_BULK)
- continue;
- if (!(epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK)) {
- if (!epwrite) epwrite=epd;
- } else {
- if (!epread) epread=epd;
- }
- }
- /* Ignore buggy hardware without the right endpoints. */
- if (!epwrite || (ifd->bInterfaceProtocol > 1 && !epread))
- continue;
- /* Turn off reads for 7/1/1 (unidirectional) interfaces
- * and buggy bidirectional printers. */
- if (ifd->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->bInterfaceProtocol].alt_setting = i;
- usblp->protocol[ifd->bInterfaceProtocol].epwrite = epwrite;
- usblp->protocol[ifd->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;
- }
- FILL_BULK_URB(&usblp->writeurb, usblp->dev,
- usb_sndbulkpipe(usblp->dev,
- usblp->protocol[protocol].epwrite->bEndpointAddress),
- usblp->buf, 0,
- usblp_bulk, usblp);
- usblp->bidir = (usblp->protocol[protocol].epread != 0);
- if (usblp->bidir)
- FILL_BULK_URB(&usblp->readurb, usblp->dev,
- usb_rcvbulkpipe(usblp->dev,
- usblp->protocol[protocol].epread->bEndpointAddress),
- usblp->buf + USBLP_BUF_SIZE, USBLP_BUF_SIZE,
- usblp_bulk, 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, 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] = ' ';
- return -EIO;
- }
- /* First two bytes are length in big-endian.
- * They count themselves, and we copy them into
- * the user's buffer. */
- length = (usblp->device_id_string[0] << 8) + usblp->device_id_string[1];
- if (length < 2)
- length = 2;
- else if (length >= DEVICE_ID_SIZE)
- length = DEVICE_ID_SIZE - 1;
- usblp->device_id_string[length] = ' ';
- 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_device *dev, void *ptr)
- {
- struct usblp *usblp = ptr;
- if (!usblp || !usblp->dev) {
- err("bogus disconnect");
- BUG ();
- }
- down (&usblp->sem);
- lock_kernel();
- usblp->dev = NULL;
- usblp_unlink_urbs(usblp);
- if (!usblp->used)
- usblp_cleanup (usblp);
- else /* cleanup later, on close */
- up (&usblp->sem);
- unlock_kernel();
- }
- 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,
- fops: &usblp_fops,
- minor: USBLP_MINOR_BASE,
- id_table: usblp_ids,
- };
- static int __init usblp_init(void)
- {
- if (usb_register(&usblp_driver))
- return -1;
- info(DRIVER_VERSION ": " DRIVER_DESC);
- return 0;
- }
- 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_PARM(proto_bias, "i");
- MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
- MODULE_LICENSE("GPL");