| // 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) |
| |
| static int usblp_hp_channel_change_request(struct usblp *usblp, int channel, u8 *new_channel) |
| { |
| u8 *buf; |
| int ret; |
| |
| buf = kzalloc(1, GFP_KERNEL); |
| if (!buf) |
| return -ENOMEM; |
| |
| ret = usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, |
| USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, |
| channel, buf, 1); |
| if (ret == 0) |
| *new_channel = buf[0]; |
| |
| kfree(buf); |
| |
| return ret; |
| } |
| |
| /* |
| * 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); |
| usb_put_intf(usblp->intf); |
| 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); |
| |
| if (!usblp->present) /* finish cleanup from disconnect */ |
| usblp_cleanup(usblp); /* any URBs must be dead */ |
| |
| mutex_unlock(&usblp_mutex); |
| return 0; |
| } |
| |
| /* No kernel lock - fine */ |
| static __poll_t usblp_poll(struct file *file, struct poll_table_struct *wait) |
| { |
| struct usblp *usblp = file->private_data; |
| __poll_t ret = 0; |
| unsigned long flags; |
| |
| /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */ |
| poll_wait(file, &usblp->rwait, wait); |
| poll_wait(file, &usblp->wwait, wait); |
| |
| mutex_lock(&usblp->mut); |
| if (!usblp->present) |
| ret |= EPOLLHUP; |
| mutex_unlock(&usblp->mut); |
| |
| spin_lock_irqsave(&usblp->lock, flags); |
| if (usblp->bidir && usblp->rcomplete) |
| ret |= EPOLLIN | EPOLLRDNORM; |
| if (usblp->no_paper || usblp->wcomplete) |
| ret |= EPOLLOUT | EPOLLWRNORM; |
| 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 (!usblp->present) { |
| count = -ENODEV; |
| goto done; |
| } |
| |
| 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 = usb_get_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); |
| usb_put_intf(usblp->intf); |
| 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; |
| |
| /* Don't unnecessarily set the interface if there's a single alt. */ |
| if (usblp->intf->num_altsetting > 1) { |
| 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); |
| usb_poison_anchored_urbs(&usblp->urbs); |
| |
| 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"); |