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linux/drivers/usb/class/usblp.c
Domen Puncer 01205a0e60 [PATCH] USB: usblp: 2x up() in usblp_read 
up(&usblp->sem) was called twice in a row in this code path.

Signed-off-by: Domen Puncer <domen@coderock.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-06-27 14:44:02 -07:00

1218 lines
34 KiB
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/*
* 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 <rddunlap@osdl.org>
* 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- 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>
#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 semaphore sem; /* 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 *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("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 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 DECLARE_MUTEX(usblp_sem); /* 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 pt_regs *regs)
{
struct usblp *usblp = urb->context;
if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
return;
if (unlikely(urb->status))
warn("usblp%d: nonzero read/write bulk status received: %d",
usblp->minor, urb->status);
usblp->rcomplete = 1;
wake_up_interruptible(&usblp->wait);
}
static void usblp_bulk_write(struct urb *urb, struct pt_regs *regs)
{
struct usblp *usblp = urb->context;
if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
return;
if (unlikely(urb->status))
warn("usblp%d: nonzero read/write bulk status received: %d",
usblp->minor, urb->status);
usblp->wcomplete = 1;
wake_up_interruptible(&usblp->wait);
}
/*
* Get and print printer errors.
*/
static 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) {
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;
}
/*
* 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;
down (&usblp_sem);
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 (usblp->bidir) {
usblp->readcount = 0;
usblp->readurb->dev = usblp->dev;
if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
retval = -EIO;
usblp->used = 0;
file->private_data = NULL;
}
}
out:
up (&usblp_sem);
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;
down (&usblp_sem);
usblp->used = 0;
if (usblp->present) {
usblp_unlink_urbs(usblp);
} else /* finish cleanup from disconnect */
usblp_cleanup (usblp);
up (&usblp_sem);
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 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 newChannel;
int status;
int twoints[2];
int retval = 0;
down (&usblp->sem);
if (!usblp->present) {
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)) {
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:
up (&usblp->sem);
return retval;
}
static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
{
DECLARE_WAITQUEUE(wait, current);
struct usblp *usblp = file->private_data;
int timeout, 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;
add_wait_queue(&usblp->wait, &wait);
while ( 1==1 ) {
if (signal_pending(current)) {
remove_wait_queue(&usblp->wait, &wait);
return writecount ? writecount : -EINTR;
}
set_current_state(TASK_INTERRUPTIBLE);
if (timeout && !usblp->wcomplete) {
timeout = schedule_timeout(timeout);
} else {
set_current_state(TASK_RUNNING);
break;
}
}
remove_wait_queue(&usblp->wait, &wait);
}
down (&usblp->sem);
if (!usblp->present) {
up (&usblp->sem);
return -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);
up (&usblp->sem);
/* if the fault was due to disconnect, let khubd's
* call to usblp_disconnect() grab usblp->sem ...
*/
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) {
up(&usblp->sem);
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)) {
up(&usblp->sem);
return writecount ? writecount : -EFAULT;
}
usblp->writeurb->dev = usblp->dev;
usblp->wcomplete = 0;
err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
if (err) {
if (err != -ENOMEM)
count = -EIO;
else
count = writecount ? writecount : -ENOMEM;
up (&usblp->sem);
break;
}
up (&usblp->sem);
}
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;
DECLARE_WAITQUEUE(wait, current);
if (!usblp->bidir)
return -EINVAL;
down (&usblp->sem);
if (!usblp->present) {
count = -ENODEV;
goto done;
}
if (!usblp->rcomplete) {
barrier();
if (file->f_flags & O_NONBLOCK) {
count = -EAGAIN;
goto done;
}
add_wait_queue(&usblp->wait, &wait);
while (1==1) {
if (signal_pending(current)) {
count = -EINTR;
remove_wait_queue(&usblp->wait, &wait);
goto done;
}
up (&usblp->sem);
set_current_state(TASK_INTERRUPTIBLE);
if (!usblp->rcomplete) {
schedule();
} else {
set_current_state(TASK_RUNNING);
down(&usblp->sem);
break;
}
down (&usblp->sem);
}
remove_wait_queue(&usblp->wait, &wait);
}
if (!usblp->present) {
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:
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 struct usb_class_driver usblp_class = {
.name = "usb/lp%d",
.fops = &usblp_fops,
.mode = S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
.minor_base = USBLP_MINOR_BASE,
};
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 = 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 = 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);
#ifdef DEBUG
usblp_check_status(usblp, 0);
#endif
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));
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;
return 0;
abort_intfdata:
usb_set_intfdata (intf, NULL);
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 ((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->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 ();
}
down (&usblp_sem);
down (&usblp->sem);
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);
up (&usblp->sem);
if (!usblp->used)
usblp_cleanup (usblp);
up (&usblp_sem);
}
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 = {
.owner = THIS_MODULE,
.name = "usblp",
.probe = usblp_probe,
.disconnect = usblp_disconnect,
.id_table = usblp_ids,
};
static int __init usblp_init(void)
{
int retval;
retval = usb_register(&usblp_driver);
if (retval)
goto out;
info(DRIVER_VERSION ": " DRIVER_DESC);
out:
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");
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