v4.19.13 snapshot.
diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
new file mode 100644
index 0000000..407a7a6
--- /dev/null
+++ b/drivers/usb/class/usblp.c
@@ -0,0 +1,1433 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * usblp.c
+ *
+ * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com>
+ * Copyright (c) 1999 Pavel Machek <pavel@ucw.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_alloc_coherent() for read buf & write buf;
+ * none - Maintained in Linux kernel after v0.13
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched/signal.h>
+#include <linux/signal.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/lp.h>
+#include <linux/mutex.h>
+#undef DEBUG
+#include <linux/usb.h>
+#include <linux/usb/ch9.h>
+#include <linux/ratelimit.h>
+
+/*
+ * Version Information
+ */
+#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 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=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
+ * 3=USB_CLASS_PRINTER/1/3),
+ * [1]=supported protocol mask (mask&(1<<n)!=0 means
+ * USB_CLASS_PRINTER/1/n supported):
+ */
+#define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
+/*
+ * Set protocol
+ * (arg: 1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
+ * 3=USB_CLASS_PRINTER/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_CTL_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
+
+/*
+ * 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 wmut;
+ struct mutex mut;
+ spinlock_t lock; /* locks rcomplete, wcomplete */
+ char *readbuf; /* read transfer_buffer */
+ char *statusbuf; /* status transfer_buffer */
+ 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 */
+ /*
+ * Alternate-setting numbers and endpoints for each protocol
+ * (USB_CLASS_PRINTER/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, 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 no_paper; /* Paper Out happened */
+ 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)
+{
+ struct device *dev = &usblp->intf->dev;
+ int p;
+
+ dev_dbg(dev, "usblp=0x%p\n", usblp);
+ dev_dbg(dev, "dev=0x%p\n", usblp->dev);
+ dev_dbg(dev, "present=%d\n", usblp->present);
+ dev_dbg(dev, "readbuf=0x%p\n", usblp->readbuf);
+ dev_dbg(dev, "readcount=%d\n", usblp->readcount);
+ dev_dbg(dev, "ifnum=%d\n", usblp->ifnum);
+ for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
+ dev_dbg(dev, "protocol[%d].alt_setting=%d\n", p,
+ usblp->protocol[p].alt_setting);
+ dev_dbg(dev, "protocol[%d].epwrite=%p\n", p,
+ usblp->protocol[p].epwrite);
+ dev_dbg(dev, "protocol[%d].epread=%p\n", p,
+ usblp->protocol[p].epread);
+ }
+ dev_dbg(dev, "current_protocol=%d\n", usblp->current_protocol);
+ dev_dbg(dev, "minor=%d\n", usblp->minor);
+ dev_dbg(dev, "wstatus=%d\n", usblp->wstatus);
+ dev_dbg(dev, "rstatus=%d\n", usblp->rstatus);
+ dev_dbg(dev, "quirks=%d\n", usblp->quirks);
+ dev_dbg(dev, "used=%d\n", usblp->used);
+ dev_dbg(dev, "bidir=%d\n", usblp->bidir);
+ dev_dbg(dev, "device_id_string=\"%s\"\n",
+ 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 */
+#define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */
+
+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) */
+ { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */
+ { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR }, /* Brother Industries, Ltd HL-1440 Laser Printer */
+ { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */
+ { 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);
+
+/* 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_CTL_TIMEOUT);
+ dev_dbg(&usblp->intf->dev,
+ "usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d\n",
+ 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 /sys/kernel/debug/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;
+ int status = urb->status;
+ unsigned long flags;
+
+ if (usblp->present && usblp->used) {
+ if (status)
+ printk(KERN_WARNING "usblp%d: "
+ "nonzero read bulk status received: %d\n",
+ usblp->minor, status);
+ }
+ spin_lock_irqsave(&usblp->lock, flags);
+ if (status < 0)
+ usblp->rstatus = status;
+ else
+ usblp->rstatus = urb->actual_length;
+ usblp->rcomplete = 1;
+ wake_up(&usblp->rwait);
+ spin_unlock_irqrestore(&usblp->lock, flags);
+
+ usb_free_urb(urb);
+}
+
+static void usblp_bulk_write(struct urb *urb)
+{
+ struct usblp *usblp = urb->context;
+ int status = urb->status;
+ unsigned long flags;
+
+ if (usblp->present && usblp->used) {
+ if (status)
+ printk(KERN_WARNING "usblp%d: "
+ "nonzero write bulk status received: %d\n",
+ usblp->minor, status);
+ }
+ spin_lock_irqsave(&usblp->lock, flags);
+ if (status < 0)
+ usblp->wstatus = status;
+ else
+ usblp->wstatus = urb->actual_length;
+ usblp->no_paper = 0;
+ usblp->wcomplete = 1;
+ wake_up(&usblp->wwait);
+ spin_unlock_irqrestore(&usblp->lock, flags);
+
+ usb_free_urb(urb);
+}
+
+/*
+ * 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;
+
+ mutex_lock(&usblp->mut);
+ if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) {
+ mutex_unlock(&usblp->mut);
+ printk_ratelimited(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_POUTPA)
+ newerr = 1;
+ if (~status & LP_PSELECD)
+ newerr = 2;
+
+ 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) {
+ if (usblp_submit_read(usblp) < 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;
+
+ /*
+ * 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
+ */
+
+ retval = usb_autopm_get_interface(intf);
+ if (retval < 0)
+ goto out;
+ usblp->used = 1;
+ file->private_data = usblp;
+
+ usblp->wcomplete = 1; /* we begin writeable */
+ usblp->wstatus = 0;
+ usblp->rcomplete = 0;
+
+ if (handle_bidir(usblp) < 0) {
+ usb_autopm_put_interface(intf);
+ usblp->used = 0;
+ file->private_data = NULL;
+ retval = -EIO;
+ }
+out:
+ mutex_unlock(&usblp_mutex);
+ return retval;
+}
+
+static void usblp_cleanup(struct usblp *usblp)
+{
+ printk(KERN_INFO "usblp%d: removed\n", usblp->minor);
+
+ kfree(usblp->readbuf);
+ kfree(usblp->device_id_string);
+ kfree(usblp->statusbuf);
+ kfree(usblp);
+}
+
+static void usblp_unlink_urbs(struct usblp *usblp)
+{
+ 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) {
+ usblp_unlink_urbs(usblp);
+ usb_autopm_put_interface(usblp->intf);
+ } else /* finish cleanup from disconnect */
+ usblp_cleanup(usblp);
+ mutex_unlock(&usblp_mutex);
+ return 0;
+}
+
+/* No kernel lock - fine */
+static __poll_t usblp_poll(struct file *file, struct poll_table_struct *wait)
+{
+ __poll_t ret;
+ unsigned long flags;
+
+ struct usblp *usblp = file->private_data;
+ /* 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) ? EPOLLIN | EPOLLRDNORM : 0) |
+ ((usblp->no_paper || usblp->wcomplete) ? EPOLLOUT | EPOLLWRNORM : 0);
+ spin_unlock_irqrestore(&usblp->lock, flags);
+ return ret;
+}
+
+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;
+ }
+
+ dev_dbg(&usblp->intf->dev,
+ "usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)\n", 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) {
+ dev_err(&usblp->dev->dev,
+ "usblp%d: error = %d setting "
+ "HP channel\n",
+ usblp->minor, err);
+ retval = -EIO;
+ goto done;
+ }
+
+ dev_dbg(&usblp->intf->dev,
+ "usblp%d requested/got HP channel %ld/%d\n",
+ 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;
+ }
+
+ dev_dbg(&usblp->intf->dev,
+ "usblp%d is bus=%d, device=%d\n",
+ 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;
+ }
+
+ dev_dbg(&usblp->intf->dev,
+ "usblp%d is VID=0x%4.4X, PID=0x%4.4X\n",
+ 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:
+ retval = usblp_read_status(usblp, usblp->statusbuf);
+ if (retval) {
+ printk_ratelimited(KERN_ERR "usblp%d:"
+ "failed reading printer status (%d)\n",
+ usblp->minor, retval);
+ retval = -EIO;
+ goto done;
+ }
+ status = *usblp->statusbuf;
+ if (copy_to_user((void __user *)arg, &status, sizeof(int)))
+ retval = -EFAULT;
+ break;
+
+ case LPABORT:
+ if (arg)
+ usblp->flags |= LP_ABORT;
+ else
+ usblp->flags &= ~LP_ABORT;
+ break;
+
+ default:
+ retval = -ENOTTY;
+ }
+
+done:
+ mutex_unlock(&usblp->mut);
+ return retval;
+}
+
+static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length)
+{
+ struct urb *urb;
+ char *writebuf;
+
+ writebuf = kmalloc(transfer_length, GFP_KERNEL);
+ if (writebuf == NULL)
+ return NULL;
+ urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (urb == NULL) {
+ kfree(writebuf);
+ return NULL;
+ }
+
+ 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;
+
+ return urb;
+}
+
+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;
+
+ while (writecount < count) {
+ /*
+ * Step 1: Submit next block.
+ */
+ if ((transfer_length = count - writecount) > USBLP_BUF_SIZE)
+ transfer_length = USBLP_BUF_SIZE;
+
+ rv = -ENOMEM;
+ writeurb = usblp_new_writeurb(usblp, transfer_length);
+ if (writeurb == NULL)
+ goto raise_urb;
+ usb_anchor_urb(writeurb, &usblp->urbs);
+
+ if (copy_from_user(writeurb->transfer_buffer,
+ buffer + writecount, transfer_length)) {
+ rv = -EFAULT;
+ goto raise_badaddr;
+ }
+
+ spin_lock_irq(&usblp->lock);
+ usblp->wcomplete = 0;
+ 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;
+ 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;
+ }
+ /*
+ * This is critical: it must be our URB, not other writer's.
+ * The wmut exists mainly to cover us here.
+ */
+ writecount += usblp->wstatus;
+ }
+
+ 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;
+}
+
+/*
+ * 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;
+ ssize_t count;
+ ssize_t avail;
+ int rv;
+
+ if (!usblp->bidir)
+ return -EINVAL;
+
+ 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;
+ }
+
+ 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 ((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 (;;) {
+ if (mutex_lock_interruptible(&usblp->mut)) {
+ rc = -EINTR;
+ break;
+ }
+ set_current_state(TASK_INTERRUPTIBLE);
+ rc = usblp_wtest(usblp, nonblock);
+ mutex_unlock(&usblp->mut);
+ if (rc <= 0)
+ break;
+
+ if (schedule_timeout(msecs_to_jiffies(1500)) == 0) {
+ if (usblp->flags & LP_ABORT) {
+ err = usblp_check_status(usblp, err);
+ if (err == 1) { /* Paper out */
+ rc = -ENOSPC;
+ break;
+ }
+ } else {
+ /* Prod the printer, Gentoo#251237. */
+ mutex_lock(&usblp->mut);
+ usblp_read_status(usblp, usblp->statusbuf);
+ mutex_unlock(&usblp->mut);
+ }
+ }
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&usblp->wwait, &waita);
+ return rc;
+}
+
+static int usblp_wtest(struct usblp *usblp, int nonblock)
+{
+ unsigned long flags;
+
+ 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 (nonblock)
+ return -EAGAIN;
+ return 1;
+}
+
+/*
+ * 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;
+}
+
+static int usblp_rtest(struct usblp *usblp, int nonblock)
+{
+ unsigned long flags;
+
+ 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 (nonblock)
+ return -EAGAIN;
+ return 1;
+}
+
+/*
+ * 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;
+ urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (urb == 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) {
+ dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc);
+ spin_lock_irqsave(&usblp->lock, flags);
+ usblp->rstatus = rc;
+ usblp->rcomplete = 1;
+ spin_unlock_irqrestore(&usblp->lock, flags);
+ goto raise_submit;
+ }
+
+ return 0;
+
+raise_submit:
+ usb_unanchor_urb(urb);
+ usb_free_urb(urb);
+raise_urb:
+ return rc;
+}
+
+/*
+ * 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,
+ .llseek = noop_llseek,
+};
+
+static char *usblp_devnode(struct device *dev, umode_t *mode)
+{
+ return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
+}
+
+static struct usb_class_driver usblp_class = {
+ .name = "lp%d",
+ .devnode = usblp_devnode,
+ .fops = &usblp_fops,
+ .minor_base = USBLP_MINOR_BASE,
+};
+
+static ssize_t ieee1284_id_show(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_RO(ieee1284_id);
+
+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;
+ int protocol;
+ int retval;
+
+ /* Malloc and start initializing usblp structure so we can use it
+ * directly. */
+ usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL);
+ if (!usblp) {
+ retval = -ENOMEM;
+ goto abort_ret;
+ }
+ usblp->dev = dev;
+ mutex_init(&usblp->wmut);
+ mutex_init(&usblp->mut);
+ 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;
+
+ /* 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))) {
+ retval = -ENOMEM;
+ goto abort;
+ }
+
+ /*
+ * Allocate read buffer. We somewhat wastefully
+ * malloc both regardless of bidirectionality, because the
+ * 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) {
+ retval = -ENOMEM;
+ 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) {
+ dev_dbg(&intf->dev,
+ "incompatible printer-class device 0x%4.4X/0x%4.4X\n",
+ 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) {
+ retval = -ENODEV; /* ->probe isn't ->ioctl */
+ 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) {
+ dev_err(&intf->dev,
+ "usblp: Not able to get a minor (base %u, slice default): %d\n",
+ USBLP_MINOR_BASE, retval);
+ goto abort_intfdata;
+ }
+ usblp->minor = intf->minor;
+ dev_info(&intf->dev,
+ "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,
+ 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:
+ kfree(usblp->readbuf);
+ kfree(usblp->statusbuf);
+ kfree(usblp->device_id_string);
+ kfree(usblp);
+abort_ret:
+ return retval;
+}
+
+/*
+ * 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=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
+ * 3=USB_CLASS_PRINTER/1/3). If the device supports the preferred protocol,
+ * then we bind to it.
+ *
+ * The best interface for us is USB_CLASS_PRINTER/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 USB_CLASS_PRINTER/1/3 (MLC/1284.4), so we provide them ioctls
+ * for this purpose.
+ *
+ * Failing USB_CLASS_PRINTER/1/2, we look for USB_CLASS_PRINTER/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 USB_CLASS_PRINTER/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 *epwrite, *epread;
+ int p, i;
+ int res;
+
+ 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 != USB_CLASS_PRINTER ||
+ ifd->desc.bInterfaceSubClass != 1)
+ if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
+ continue;
+
+ if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
+ ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
+ continue;
+
+ /* Look for the expected bulk endpoints. */
+ if (ifd->desc.bInterfaceProtocol > 1) {
+ res = usb_find_common_endpoints(ifd,
+ &epread, &epwrite, NULL, NULL);
+ } else {
+ epread = NULL;
+ res = usb_find_bulk_out_endpoint(ifd, &epwrite);
+ }
+
+ /* Ignore buggy hardware without the right endpoints. */
+ if (res)
+ continue;
+
+ /* Turn off reads for buggy bidirectional printers. */
+ if (usblp->quirks & USBLP_QUIRK_BIDIR) {
+ printk(KERN_INFO "usblp%d: Disabling reads from "
+ "problematic bidirectional printer\n",
+ 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) {
+ printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
+ alts, usblp->ifnum);
+ return r;
+ }
+
+ usblp->bidir = (usblp->protocol[protocol].epread != NULL);
+ usblp->current_protocol = protocol;
+ dev_dbg(&usblp->intf->dev, "usblp%d set protocol %d\n",
+ 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) {
+ dev_dbg(&usblp->intf->dev,
+ "usblp%d: error = %d reading IEEE-1284 Device ID string\n",
+ 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';
+
+ dev_dbg(&usblp->intf->dev, "usblp%d Device ID string [len=%d]=\"%s\"\n",
+ 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) {
+ dev_err(&intf->dev, "bogus disconnect\n");
+ BUG();
+ }
+
+ device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
+
+ 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);
+ 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);
+
+ 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 usblp_resume(struct usb_interface *intf)
+{
+ struct usblp *usblp = usb_get_intfdata(intf);
+ int r;
+
+ r = handle_bidir(usblp);
+
+ return r;
+}
+
+static const struct usb_device_id usblp_ids[] = {
+ { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 1) },
+ { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 2) },
+ { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 3) },
+ { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 1) },
+ { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 2) },
+ { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 3) },
+ { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
+ { } /* 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,
+ .supports_autosuspend = 1,
+};
+
+module_usb_driver(usblp_driver);
+
+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");