/*
- * usblp.c Version 0.13
+ * usblp.c
*
* Copyright (c) 1999 Michael Gee <michael@linuxspecific.com>
* Copyright (c) 1999 Pavel Machek <pavel@suse.cz>
* 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;
+ * none - Maintained in Linux kernel after v0.13
*/
/*
/*
* 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_BUF_SIZE_IN 1024
#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 USBLP_MINORS 16
#define USBLP_MINOR_BASE 0
-#define USBLP_WRITE_TIMEOUT (5000) /* 5 seconds */
+#define USBLP_CTL_TIMEOUT 5000 /* 5 seconds */
#define USBLP_FIRST_PROTOCOL 1
#define USBLP_LAST_PROTOCOL 3
*/
#define STATUS_BUF_SIZE 8
+/*
+ * Locks down the locking order:
+ * ->wmut locks wstatus.
+ * ->mut locks the whole usblp, except [rw]complete, and thus, by indirection,
+ * [rw]status. We only touch status when we know the side idle.
+ * ->lock locks what interrupt accesses.
+ */
struct usblp {
struct usb_device *dev; /* USB device */
- struct mutex mut; /* locks this struct, especially "dev" */
- char *writebuf; /* write transfer_buffer */
+ struct mutex wmut;
+ struct mutex mut;
+ spinlock_t lock; /* locks rcomplete, wcomplete */
char *readbuf; /* read transfer_buffer */
char *statusbuf; /* status transfer_buffer */
- struct urb *readurb, *writeurb; /* The urbs */
- wait_queue_head_t wait; /* Zzzzz ... */
+ struct usb_anchor urbs;
+ wait_queue_head_t rwait, wwait;
int readcount; /* Counter for reads */
int ifnum; /* Interface number */
struct usb_interface *intf; /* The interface */
} protocol[USBLP_MAX_PROTOCOLS];
int current_protocol;
int minor; /* minor number of device */
- int wcomplete; /* writing is completed */
- int rcomplete; /* reading is completed */
+ int wcomplete, rcomplete;
+ int wstatus; /* bytes written or error */
+ int rstatus; /* bytes ready or error */
unsigned int quirks; /* quirks flags */
+ unsigned int flags; /* mode 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 no_paper; /* Paper Out happened */
unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */
/* first 2 bytes are (big-endian) length */
};
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("current_protocol=%d", usblp->current_protocol);
dbg("minor=%d", usblp->minor);
- dbg("wcomplete=%d", usblp->wcomplete);
- dbg("rcomplete=%d", usblp->rcomplete);
+ dbg("wstatus=%d", usblp->wstatus);
+ dbg("rstatus=%d", usblp->rstatus);
dbg("quirks=%d", usblp->quirks);
dbg("used=%d", usblp->used);
dbg("bidir=%d", usblp->bidir);
{ 0, 0 }
};
+static int usblp_wwait(struct usblp *usblp, int nonblock);
+static int usblp_wtest(struct usblp *usblp, int nonblock);
+static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock);
+static int usblp_rtest(struct usblp *usblp, int nonblock);
+static int usblp_submit_read(struct usblp *usblp);
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);
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);
+ request, type | dir | recip, value, index, buf, len, USBLP_CTL_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;
static void usblp_bulk_read(struct urb *urb)
{
struct usblp *usblp = urb->context;
+ int status = urb->status;
- 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);
+ if (usblp->present && usblp->used) {
+ if (status)
+ printk(KERN_WARNING "usblp%d: "
+ "nonzero read bulk status received: %d\n",
+ usblp->minor, status);
+ }
+ spin_lock(&usblp->lock);
+ if (status < 0)
+ usblp->rstatus = status;
+ else
+ usblp->rstatus = urb->actual_length;
usblp->rcomplete = 1;
-unplug:
- wake_up_interruptible(&usblp->wait);
+ wake_up(&usblp->rwait);
+ spin_unlock(&usblp->lock);
+
+ usb_free_urb(urb);
}
static void usblp_bulk_write(struct urb *urb)
{
struct usblp *usblp = urb->context;
+ int status = urb->status;
- 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);
+ if (usblp->present && usblp->used) {
+ if (status)
+ printk(KERN_WARNING "usblp%d: "
+ "nonzero write bulk status received: %d\n",
+ usblp->minor, status);
+ }
+ spin_lock(&usblp->lock);
+ if (status < 0)
+ usblp->wstatus = status;
+ else
+ usblp->wstatus = urb->actual_length;
+ usblp->no_paper = 0;
usblp->wcomplete = 1;
-unplug:
- wake_up_interruptible(&usblp->wait);
+ wake_up(&usblp->wwait);
+ spin_unlock(&usblp->lock);
+
+ usb_free_urb(urb);
}
/*
unsigned char status, newerr = 0;
int error;
- error = usblp_read_status (usblp, usblp->statusbuf);
- if (error < 0) {
+ mutex_lock(&usblp->mut);
+ if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) {
+ mutex_unlock(&usblp->mut);
if (printk_ratelimit())
- err("usblp%d: error %d reading printer status",
+ printk(KERN_ERR
+ "usblp%d: error %d reading printer status\n",
usblp->minor, error);
return 0;
}
-
status = *usblp->statusbuf;
+ mutex_unlock(&usblp->mut);
if (~status & LP_PERRORP)
newerr = 3;
if (~status & LP_PSELECD)
newerr = 2;
- if (newerr != err)
- info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
+ if (newerr != err) {
+ printk(KERN_INFO "usblp%d: %s\n",
+ 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)
+ if (usblp_submit_read(usblp) < 0)
return -EIO;
}
-
return 0;
}
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.
+ * We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons:
+ * - We do not want persistent state which close(2) does not clear
+ * - It is not used anyway, according to CUPS people
*/
-#if 0
- if ((retval = usblp_check_status(usblp, 0))) {
- retval = retval > 1 ? -EIO : -ENOSPC;
- goto out;
- }
-#else
- retval = 0;
-#endif
retval = usb_autopm_get_interface(intf);
if (retval < 0)
usblp->used = 1;
file->private_data = usblp;
- usblp->writeurb->transfer_buffer_length = 0;
usblp->wcomplete = 1; /* we begin writeable */
+ usblp->wstatus = 0;
usblp->rcomplete = 0;
- usblp->writeurb->status = 0;
- usblp->readurb->status = 0;
if (handle_bidir(usblp) < 0) {
+ usb_autopm_put_interface(intf);
usblp->used = 0;
file->private_data = NULL;
retval = -EIO;
static void usblp_cleanup (struct usblp *usblp)
{
- info("usblp%d: removed", usblp->minor);
+ printk(KERN_INFO "usblp%d: removed\n", usblp->minor);
+ kfree(usblp->readbuf);
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);
+ usb_kill_anchored_urbs(&usblp->urbs);
}
static int usblp_release(struct inode *inode, struct file *file)
{
struct usblp *usblp = file->private_data;
+ usblp->flags &= ~LP_ABORT;
+
mutex_lock (&usblp_mutex);
usblp->used = 0;
if (usblp->present) {
/* No kernel lock - fine */
static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
{
+ int ret;
+ unsigned long flags;
+
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);
+ /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */
+ poll_wait(file, &usblp->rwait, wait);
+ poll_wait(file, &usblp->wwait, wait);
+ spin_lock_irqsave(&usblp->lock, flags);
+ ret = ((usblp->bidir && usblp->rcomplete) ? POLLIN | POLLRDNORM : 0) |
+ ((usblp->no_paper || usblp->wcomplete) ? POLLOUT | POLLWRNORM : 0);
+ spin_unlock_irqrestore(&usblp->lock, flags);
+ return ret;
}
static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
switch (cmd) {
case LPGETSTATUS:
- if (usblp_read_status(usblp, usblp->statusbuf)) {
+ if ((retval = usblp_read_status(usblp, usblp->statusbuf))) {
if (printk_ratelimit())
- err("usblp%d: failed reading printer status",
- usblp->minor);
+ printk(KERN_ERR "usblp%d:"
+ "failed reading printer status (%d)\n",
+ usblp->minor, retval);
retval = -EIO;
goto done;
}
retval = -EFAULT;
break;
+ case LPABORT:
+ if (arg)
+ usblp->flags |= LP_ABORT;
+ else
+ usblp->flags &= ~LP_ABORT;
+ break;
+
default:
retval = -ENOTTY;
}
return retval;
}
-static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
+static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length)
{
- 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;
- }
+ struct urb *urb;
+ char *writebuf;
+
+ if ((writebuf = kmalloc(transfer_length, GFP_KERNEL)) == NULL)
+ return NULL;
+ if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL) {
+ kfree(writebuf);
+ return NULL;
+ }
- if (usblp->sleeping) {
- mutex_unlock (&usblp->mut);
- return writecount ? writecount : -ENODEV;
- }
+ usb_fill_bulk_urb(urb, usblp->dev,
+ usb_sndbulkpipe(usblp->dev,
+ usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress),
+ writebuf, transfer_length, usblp_bulk_write, usblp);
+ urb->transfer_flags |= URB_FREE_BUFFER;
- 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);
+ return urb;
+}
- /* if the fault was due to disconnect, let khubd's
- * call to usblp_disconnect() grab usblp->mut ...
- */
- schedule ();
- continue;
- }
+static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
+{
+ struct usblp *usblp = file->private_data;
+ struct urb *writeurb;
+ int rv;
+ int transfer_length;
+ ssize_t writecount = 0;
+
+ if (mutex_lock_interruptible(&usblp->wmut)) {
+ rv = -EINTR;
+ goto raise_biglock;
+ }
+ if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0)
+ goto raise_wait;
- /* 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.
+ while (writecount < count) {
+ /*
+ * Step 1: Submit next block.
*/
- writecount += transfer_length;
- if (writecount == count) {
- mutex_unlock(&usblp->mut);
- break;
- }
-
- transfer_length=(count - writecount);
- if (transfer_length > USBLP_BUF_SIZE)
+ if ((transfer_length = count - writecount) > USBLP_BUF_SIZE)
transfer_length = USBLP_BUF_SIZE;
- usblp->writeurb->transfer_buffer_length = transfer_length;
+ rv = -ENOMEM;
+ if ((writeurb = usblp_new_writeurb(usblp, transfer_length)) == NULL)
+ goto raise_urb;
+ usb_anchor_urb(writeurb, &usblp->urbs);
- if (copy_from_user(usblp->writeurb->transfer_buffer,
+ if (copy_from_user(writeurb->transfer_buffer,
buffer + writecount, transfer_length)) {
- mutex_unlock(&usblp->mut);
- return writecount ? writecount : -EFAULT;
+ rv = -EFAULT;
+ goto raise_badaddr;
}
- usblp->writeurb->dev = usblp->dev;
+ spin_lock_irq(&usblp->lock);
usblp->wcomplete = 0;
- err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
- if (err) {
+ spin_unlock_irq(&usblp->lock);
+ if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) {
+ usblp->wstatus = 0;
+ spin_lock_irq(&usblp->lock);
+ usblp->no_paper = 0;
usblp->wcomplete = 1;
- if (err != -ENOMEM)
- count = -EIO;
- else
- count = writecount ? writecount : -ENOMEM;
- mutex_unlock (&usblp->mut);
- break;
+ wake_up(&usblp->wwait);
+ spin_unlock_irq(&usblp->lock);
+ if (rv != -ENOMEM)
+ rv = -EIO;
+ goto raise_submit;
+ }
+
+ /*
+ * Step 2: Wait for transfer to end, collect results.
+ */
+ rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK));
+ if (rv < 0) {
+ if (rv == -EAGAIN) {
+ /* Presume that it's going to complete well. */
+ writecount += transfer_length;
+ }
+ if (rv == -ENOSPC) {
+ spin_lock_irq(&usblp->lock);
+ usblp->no_paper = 1; /* Mark for poll(2) */
+ spin_unlock_irq(&usblp->lock);
+ writecount += transfer_length;
+ }
+ /* Leave URB dangling, to be cleaned on close. */
+ goto collect_error;
+ }
+
+ if (usblp->wstatus < 0) {
+ rv = -EIO;
+ goto collect_error;
}
- mutex_unlock (&usblp->mut);
+ /*
+ * This is critical: it must be our URB, not other writer's.
+ * The wmut exists mainly to cover us here.
+ */
+ writecount += usblp->wstatus;
}
- return count;
+ mutex_unlock(&usblp->wmut);
+ return writecount;
+
+raise_submit:
+raise_badaddr:
+ usb_unanchor_urb(writeurb);
+ usb_free_urb(writeurb);
+raise_urb:
+raise_wait:
+collect_error: /* Out of raise sequence */
+ mutex_unlock(&usblp->wmut);
+raise_biglock:
+ return writecount ? writecount : rv;
}
-static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
+/*
+ * Notice that we fail to restart in a few cases: on EFAULT, on restart
+ * error, etc. This is the historical behaviour. In all such cases we return
+ * EIO, and applications loop in order to get the new read going.
+ */
+static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos)
{
struct usblp *usblp = file->private_data;
- int rv, intr;
+ ssize_t count;
+ ssize_t avail;
+ int rv;
if (!usblp->bidir)
return -EINVAL;
- intr = mutex_lock_interruptible (&usblp->mut);
- if (intr)
- return -EINTR;
- if (!usblp->present) {
- count = -ENODEV;
+ rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK));
+ if (rv < 0)
+ return rv;
+
+ if ((avail = usblp->rstatus) < 0) {
+ printk(KERN_ERR "usblp%d: error %d reading from printer\n",
+ usblp->minor, (int)avail);
+ usblp_submit_read(usblp);
+ count = -EIO;
goto done;
}
- if (!usblp->rcomplete) {
- barrier();
+ count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
+ if (count != 0 &&
+ copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
+ count = -EFAULT;
+ goto done;
+ }
- if (file->f_flags & O_NONBLOCK) {
- count = -EAGAIN;
+ if ((usblp->readcount += count) == avail) {
+ if (usblp_submit_read(usblp) < 0) {
+ /* We don't want to leak USB return codes into errno. */
+ if (count == 0)
+ count = -EIO;
goto done;
}
+ }
+
+done:
+ mutex_unlock (&usblp->mut);
+ return count;
+}
+
+/*
+ * Wait for the write path to come idle.
+ * This is called under the ->wmut, so the idle path stays idle.
+ *
+ * Our write path has a peculiar property: it does not buffer like a tty,
+ * but waits for the write to succeed. This allows our ->release to bug out
+ * without waiting for writes to drain. But it obviously does not work
+ * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use
+ * select(2) or poll(2) to wait for the buffer to drain before closing.
+ * Alternatively, set blocking mode with fcntl and issue a zero-size write.
+ */
+static int usblp_wwait(struct usblp *usblp, int nonblock)
+{
+ DECLARE_WAITQUEUE(waita, current);
+ int rc;
+ int err = 0;
+
+ add_wait_queue(&usblp->wwait, &waita);
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (mutex_lock_interruptible(&usblp->mut)) {
+ rc = -EINTR;
+ break;
+ }
+ rc = usblp_wtest(usblp, nonblock);
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 (rc <= 0)
+ break;
+
+ if (usblp->flags & LP_ABORT) {
+ if (schedule_timeout(msecs_to_jiffies(5000)) == 0) {
+ err = usblp_check_status(usblp, err);
+ if (err == 1) { /* Paper out */
+ rc = -ENOSPC;
+ break;
+ }
+ }
+ } else {
+ schedule();
}
}
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&usblp->wwait, &waita);
+ return rc;
+}
- if (!usblp->present) {
- count = -ENODEV;
- goto done;
- }
+static int usblp_wtest(struct usblp *usblp, int nonblock)
+{
+ unsigned long flags;
- if (usblp->sleeping) {
- count = -ENODEV;
- goto done;
+ if (!usblp->present)
+ return -ENODEV;
+ if (signal_pending(current))
+ return -EINTR;
+ spin_lock_irqsave(&usblp->lock, flags);
+ if (usblp->wcomplete) {
+ spin_unlock_irqrestore(&usblp->lock, flags);
+ return 0;
}
+ spin_unlock_irqrestore(&usblp->lock, flags);
+ if (usblp->sleeping)
+ return -ENODEV;
+ if (nonblock)
+ return -EAGAIN;
+ return 1;
+}
- 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;
+/*
+ * Wait for read bytes to become available. This probably should have been
+ * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional
+ * name for functions which lock and return.
+ *
+ * We do not use wait_event_interruptible because it makes locking iffy.
+ */
+static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock)
+{
+ DECLARE_WAITQUEUE(waita, current);
+ int rc;
+
+ add_wait_queue(&usblp->rwait, &waita);
+ for (;;) {
+ if (mutex_lock_interruptible(&usblp->mut)) {
+ rc = -EINTR;
+ break;
+ }
+ set_current_state(TASK_INTERRUPTIBLE);
+ if ((rc = usblp_rtest(usblp, nonblock)) < 0) {
+ mutex_unlock(&usblp->mut);
+ break;
+ }
+ if (rc == 0) /* Keep it locked */
+ break;
+ mutex_unlock(&usblp->mut);
+ schedule();
}
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&usblp->rwait, &waita);
+ return rc;
+}
- count = count < usblp->readurb->actual_length - usblp->readcount ?
- count : usblp->readurb->actual_length - usblp->readcount;
+static int usblp_rtest(struct usblp *usblp, int nonblock)
+{
+ unsigned long flags;
- if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
- count = -EFAULT;
- goto done;
+ if (!usblp->present)
+ return -ENODEV;
+ if (signal_pending(current))
+ return -EINTR;
+ spin_lock_irqsave(&usblp->lock, flags);
+ if (usblp->rcomplete) {
+ spin_unlock_irqrestore(&usblp->lock, flags);
+ return 0;
}
+ spin_unlock_irqrestore(&usblp->lock, flags);
+ if (usblp->sleeping)
+ return -ENODEV;
+ if (nonblock)
+ return -EAGAIN;
+ return 1;
+}
- 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;
- }
+/*
+ * Please check ->bidir and other such things outside for now.
+ */
+static int usblp_submit_read(struct usblp *usblp)
+{
+ struct urb *urb;
+ unsigned long flags;
+ int rc;
+
+ rc = -ENOMEM;
+ if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL)
+ goto raise_urb;
+
+ usb_fill_bulk_urb(urb, usblp->dev,
+ usb_rcvbulkpipe(usblp->dev,
+ usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
+ usblp->readbuf, USBLP_BUF_SIZE_IN,
+ usblp_bulk_read, usblp);
+ usb_anchor_urb(urb, &usblp->urbs);
+
+ spin_lock_irqsave(&usblp->lock, flags);
+ usblp->readcount = 0; /* XXX Why here? */
+ usblp->rcomplete = 0;
+ spin_unlock_irqrestore(&usblp->lock, flags);
+ if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
+ dbg("error submitting urb (%d)", rc);
+ spin_lock_irqsave(&usblp->lock, flags);
+ usblp->rstatus = rc;
+ usblp->rcomplete = 1;
+ spin_unlock_irqrestore(&usblp->lock, flags);
+ goto raise_submit;
}
-done:
- mutex_unlock (&usblp->mut);
- return count;
+ return 0;
+
+raise_submit:
+ usb_unanchor_urb(urb);
+ usb_free_urb(urb);
+raise_urb:
+ return rc;
}
/*
/* 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");
+ retval = -ENOMEM;
goto abort;
}
usblp->dev = dev;
+ mutex_init(&usblp->wmut);
mutex_init (&usblp->mut);
- init_waitqueue_head(&usblp->wait);
+ spin_lock_init(&usblp->lock);
+ init_waitqueue_head(&usblp->rwait);
+ init_waitqueue_head(&usblp->wwait);
+ init_usb_anchor(&usblp->urbs);
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");
+ retval = -ENOMEM;
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
+ /*
+ * Allocate read buffer. 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");
+ * alternate setting can be changed later via an ioctl.
+ */
+ if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) {
+ retval = -ENOMEM;
goto abort;
}
/* Allocate buffer for printer status */
usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
if (!usblp->statusbuf) {
- err("out of memory for statusbuf");
+ retval = -ENOMEM;
goto abort;
}
dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
le16_to_cpu(dev->descriptor.idVendor),
le16_to_cpu(dev->descriptor.idProduct));
+ retval = -ENODEV;
goto abort;
}
/* Setup the selected alternate setting and endpoints. */
- if (usblp_set_protocol(usblp, protocol) < 0)
+ if (usblp_set_protocol(usblp, protocol) < 0) {
+ retval = -ENODEV; /* ->probe isn't ->ioctl */
goto abort;
+ }
/* Retrieve and store the device ID string. */
usblp_cache_device_id_string(usblp);
retval = usb_register_dev(intf, &usblp_class);
if (retval) {
- err("Not able to get a minor for this device.");
+ printk(KERN_ERR "usblp: Not able to get a minor"
+ " (base %u, slice default): %d\n",
+ USBLP_MINOR_BASE, retval);
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",
+ printk(KERN_INFO "usblp%d: USB %sdirectional printer dev %d "
+ "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n",
usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
usblp->ifnum,
usblp->protocol[usblp->current_protocol].alt_setting,
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->readurb->transfer_dma);
+ kfree(usblp->readbuf);
kfree(usblp->statusbuf);
kfree(usblp->device_id_string);
- usb_free_urb(usblp->writeurb);
- usb_free_urb(usblp->readurb);
kfree(usblp);
}
- return -EIO;
+ return retval;
}
/*
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);
+ printk(KERN_INFO "usblp%d: Disabling reads from "
+ "problematic bidirectional printer\n",
+ usblp->minor);
epread = NULL;
}
return -EINVAL;
r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
if (r < 0) {
- err("can't set desired altsetting %d on interface %d",
+ printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
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;
mutex_lock (&usblp_mutex);
mutex_lock (&usblp->mut);
usblp->present = 0;
+ wake_up(&usblp->wwait);
+ wake_up(&usblp->rwait);
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)
/* we take no more IO */
usblp->sleeping = 1;
usblp_unlink_urbs(usblp);
+#if 0 /* XXX Do we want this? What if someone is reading, should we fail? */
+ /* not strictly necessary, but just in case */
+ wake_up(&usblp->wwait);
+ wake_up(&usblp->rwait);
+#endif
return 0;
}
static int __init usblp_init(void)
{
- int retval;
- retval = usb_register(&usblp_driver);
- if (!retval)
- info(DRIVER_VERSION ": " DRIVER_DESC);
-
- return retval;
+ return usb_register(&usblp_driver);
}
static void __exit usblp_exit(void)
projects / linux-2.6-omap-h63xx.git / blobdiff