* list_devices() - List the available printers.
* print_device() - Print a file to a USB device.
* close_device() - Close the connection to the USB printer.
+ * compare_quirks() - Compare two quirks entries.
* find_device() - Find or enumerate USB printers.
+ * find_quirks() - Find the quirks for the given printer, if any.
* get_device_id() - Get the IEEE-1284 device ID for the printer.
* list_cb() - List USB printers for discovery.
+ * load_quirks() - Load all quirks files in the /usr/share/cups/usb
+ * directory.
* make_device_uri() - Create a device URI for a USB printer.
* open_device() - Open a connection to the USB printer.
* print_cb() - Find a USB printer for printing.
- * printer_class_soft_reset()' - Do the soft reset request specific to
- * printers
- * quirks() - Get the known quirks of a given printer model
* read_thread() - Thread to read the backchannel data on.
* sidechannel_thread() - Handle side-channel requests.
* soft_reset() - Send a soft reset to the device.
+ * soft_reset_printer() - Do the soft reset request specific to printers
*/
/*
read_endp, /* Read endpoint */
protocol, /* Protocol: 1 = Uni-di, 2 = Bi-di. */
usblp_attached, /* "usblp" kernel module attached? */
- reset_after_job; /* Set to 1 by print_device() */
- unsigned int quirks; /* Quirks flags */
+ reset_after_job;/* Set to 1 by print_device() */
+ unsigned quirks; /* Quirks flags */
struct libusb_device_handle *handle; /* Open handle to device */
} usb_printer_t;
typedef int (*usb_cb_t)(usb_printer_t *, const char *, const char *,
const void *);
-typedef struct usb_globals_s
+typedef struct usb_globals_s /* Global USB printer information */
{
usb_printer_t *printer; /* Printer */
} usb_globals_t;
/*
- * Quirks: various printer quirks are handled by this table & its flags.
+ * Quirks: various printer quirks are handled by this structure and its flags.
*
- * This is copied from the usblp kernel module. So we can easily copy and paste
- * new quirks from the module.
+ * The quirks table used to be compiled into the backend but is now loaded from
+ * one or more files in the /usr/share/cups/usb directory.
*/
-struct quirk_printer_struct {
- int vendorId;
- int 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 */
-#define USBLP_QUIRK_BLACKLIST 0x8 /* these printers do not conform to the USB print spec */
-#define USBLP_QUIRK_RESET 0x4000 /* After printing do a reset
- for clean-up */
-#define USBLP_QUIRK_NO_REATTACH 0x8000 /* After printing we cannot re-attach
+#define USB_QUIRK_BLACKLIST 0x0001 /* Does not conform to the spec */
+#define USB_QUIRK_NO_REATTACH 0x0002 /* After printing we cannot re-attach
the usblp kernel module */
+#define USB_QUIRK_SOFT_RESET 0x0004 /* After printing do a soft reset
+ for clean-up */
+#define USB_QUIRK_UNIDIR 0x0008 /* Requires unidirectional mode */
+#define USB_QUIRK_USB_INIT 0x0010 /* Needs vendor USB init string */
+#define USB_QUIRK_VENDOR_CLASS 0x0020 /* Descriptor uses vendor-specific
+ Class or SubClass */
+#define USB_QUIRK_WHITELIST 0x0000 /* no quirks */
+
+
+typedef struct usb_quirk_s /* USB "quirk" information */
+{
+ int vendor_id, /* Affected vendor ID */
+ product_id; /* Affected product ID or 0 for all */
+ unsigned quirks; /* Quirks bitfield */
+} usb_quirk_t;
+
-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) */
- { 0x043d, 0x00f3, USBLP_QUIRK_NO_REATTACH }, /* Lexmark International,
- Inc. (e250d), https://bugs.launchpad.net/bugs/1084164 */
- { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820,
- by zut <kernel@zut.de> */
- { 0x04a9, 0x1095, USBLP_QUIRK_BIDIR }, /* Canon, Inc. PIXMA iP6000D
- Printer, https://bugs.launchpad.net/bugs/1160638 */
- { 0x04a9, 0x10a2, USBLP_QUIRK_BIDIR }, /* Canon, Inc. PIXMA iP4200
- Printer, http://www.cups.org/str.php?L4155 */
- { 0x04a9, 0x10b6, USBLP_QUIRK_BIDIR }, /* Canon, Inc. PIXMA iP4300
- Printer, https://bugs.launchpad.net/bugs/1032385 */
- { 0x04a9, 0x1721, USBLP_QUIRK_BIDIR }, /* Canon, Inc. MP210
- https://bugzilla.redhat.com/show_bug.cgi?id=847923#c53 */
- { 0x04a9, 0x170c, USBLP_QUIRK_BIDIR }, /* Canon, Inc. MP500
- Printer, https://bugs.launchpad.net/bugs/1032456 */
- { 0x04a9, 0x1717, USBLP_QUIRK_BIDIR }, /* Canon, Inc. MP510
- Printer, https://bugs.launchpad.net/bugs/1050009 */
- { 0x04a9, 0x173d, USBLP_QUIRK_BIDIR }, /* Canon, Inc. MP550
- Printer, http://www.cups.org/str.php?L4155 */
- { 0x04a9, 0x173e, USBLP_QUIRK_BIDIR }, /* Canon, Inc. MP560
- Printer, http://www.cups.org/str.php?L4155 */
- { 0x04a9, 0x26a3, USBLP_QUIRK_NO_REATTACH }, /* Canon, Inc. MF4150
- Printer, https://bugs.launchpad.net/bugs/1160638 */
- { 0x04f9, 0x001a, USBLP_QUIRK_NO_REATTACH }, /* Brother Industries, Ltd
- HL-1430 Laser Printer,
- https://bugs.launchpad.net/bugs/1038695 */
- { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR |
- USBLP_QUIRK_NO_REATTACH }, /* Brother Industries, Ltd
- HL-1440 Laser Printer,
- https://bugs.launchpad.net/bugs/1000253 */
- { 0x04f9, 0x000e, USBLP_QUIRK_BIDIR |
- USBLP_QUIRK_NO_REATTACH }, /* Brother Industries, Ltd
- HL-1450 Laser Printer,
- https://bugs.launchpad.net/bugs/1000253 */
- { 0x06bc, 0x000b, USBLP_QUIRK_NO_REATTACH }, /* Oki Data Corp.
- Okipage 14ex Printer,
- https://bugs.launchpad.net/bugs/872483 */
- { 0x06bc, 0x01c7, USBLP_QUIRK_NO_REATTACH }, /* Oki Data Corp. B410d,
- https://bugs.launchpad.net/bugs/872483 */
- { 0x04b8, 0x0001, USBLP_QUIRK_BIDIR |
- USBLP_QUIRK_NO_REATTACH }, /* Seiko Epson Corp. Stylus Color 740 / Photo 750,
- http://bugs.debian.org/697970 */
- { 0x04b8, 0x0005, USBLP_QUIRK_NO_REATTACH }, /* Seiko Epson Corp. Stylus Color 670,
- https://bugs.launchpad.net/bugs/872483 */
- { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt
- Printer M129C */
- { 0x067b, 0x2305, USBLP_QUIRK_BIDIR |
- USBLP_QUIRK_NO_REATTACH |
- USBLP_QUIRK_RESET },
- /* Prolific Technology, Inc. PL2305 Parallel Port
- (USB -> Parallel adapter), https://bugs.launchpad.net/bugs/987485 */
- { 0x0924, 0x3ce9, USBLP_QUIRK_NO_REATTACH }, /* Xerox Phaser 3124
- https://bugzilla.redhat.com/show_bug.cgi?id=867392 */
- { 0x0924, 0x4293, USBLP_QUIRK_NO_REATTACH }, /* Xerox WorkCentre 3210
- https://bugs.launchpad.net/bugs/1102470 */
- { 0x1a86, 0x7584, USBLP_QUIRK_NO_REATTACH }, /* QinHeng Electronics
- CH340S (USB -> Parallel adapter), https://bugs.launchpad.net/bugs/1000253 */
- { 0x04e8, 0x0000, USBLP_QUIRK_RESET }, /* All Samsung devices,
- https://bugs.launchpad.net/bugs/1032456 */
- { 0x0a5f, 0x0000, USBLP_QUIRK_BIDIR }, /* All Zebra devices,
- https://bugs.launchpad.net/bugs/1001028 */
- /* Canon */
- { 0x04a9, 0x304a, USBLP_QUIRK_BLACKLIST }, /* Canon CP-10 */
- { 0x04a9, 0x3063, USBLP_QUIRK_BLACKLIST }, /* Canon CP-100 */
- { 0x04a9, 0x307c, USBLP_QUIRK_BLACKLIST }, /* Canon CP-200 */
- { 0x04a9, 0x307d, USBLP_QUIRK_BLACKLIST }, /* Canon CP-300 */
- { 0x04a9, 0x30bd, USBLP_QUIRK_BLACKLIST }, /* Canon CP-220 */
- { 0x04a9, 0x30be, USBLP_QUIRK_BLACKLIST }, /* Canon CP-330 */
- { 0x04a9, 0x30f6, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP400 */
- { 0x04a9, 0x310b, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP600 */
- { 0x04a9, 0x3127, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP710 */
- { 0x04a9, 0x3128, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP510 */
- { 0x04a9, 0x3141, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY ES1 */
- { 0x04a9, 0x3142, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP730 */
- { 0x04a9, 0x3143, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP720 */
- { 0x04a9, 0x3170, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP750 */
- { 0x04a9, 0x3171, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP740 */
- { 0x04a9, 0x3185, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY ES2 */
- { 0x04a9, 0x3186, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY ES20 */
- { 0x04a9, 0x31aa, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP770 */
- { 0x04a9, 0x31ab, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP760 */
- { 0x04a9, 0x31b0, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY ES30 */
- { 0x04a9, 0x31dd, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP780 */
- { 0x04a9, 0x31ee, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY ES40 */
- { 0x04a9, 0x3214, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP800 */
- { 0x04a9, 0x3255, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP900 */
- { 0x04a9, 0x3256, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP810 */
- { 0x04a9, 0x30F5, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP500 */
- { 0x04a9, 0x31AF, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY ES3 */
- { 0x04a9, 0x31DD, USBLP_QUIRK_BLACKLIST }, /* Canon SELPHY CP780 */
- /* MISSING PIDs: CP520, CP530, CP790 */
- { 0, 0 }
-};
/*
* Globals...
*/
+cups_array_t *all_quirks; /* Array of printer quirks */
usb_globals_t g = { 0 }; /* Globals */
libusb_device **list; /* List of connected USB devices */
*/
static int close_device(usb_printer_t *printer);
+static int compare_quirks(usb_quirk_t *a, usb_quirk_t *b);
static usb_printer_t *find_device(usb_cb_t cb, const void *data);
+static unsigned find_quirks(int vendor_id, int product_id);
static int get_device_id(usb_printer_t *printer, char *buffer,
size_t bufsize);
static int list_cb(usb_printer_t *printer, const char *device_uri,
const char *device_id, const void *data);
+static void load_quirks(void);
static char *make_device_uri(usb_printer_t *printer,
const char *device_id,
char *uri, size_t uri_size);
static int open_device(usb_printer_t *printer, int verbose);
static int print_cb(usb_printer_t *printer, const char *device_uri,
const char *device_id, const void *data);
-static int printer_class_soft_reset(usb_printer_t *printer);
-static unsigned int quirks(int vendor, int product);
static void *read_thread(void *reference);
static void *sidechannel_thread(void *reference);
static void soft_reset(void);
+static int soft_reset_printer(usb_printer_t *printer);
/*
/*
* Some devices need a reset after finishing a job, these devices are
- * marked with the USBLP_QUIRK_RESET quirk.
+ * marked with the USB_QUIRK_SOFT_RESET quirk.
*/
- g.printer->reset_after_job = (g.printer->quirks & USBLP_QUIRK_RESET ? 1 : 0);
+ g.printer->reset_after_job = (g.printer->quirks & USB_QUIRK_SOFT_RESET ? 1 : 0);
/*
* If we are printing data from a print driver on stdin, ignore SIGTERM
}
+/*
+ * 'compare_quirks()' - Compare two quirks entries.
+ */
+
+static int /* O - Result of comparison */
+compare_quirks(usb_quirk_t *a, /* I - First quirk entry */
+ usb_quirk_t *b) /* I - Second quirk entry */
+{
+ int result; /* Result of comparison */
+
+ if ((result = b->vendor_id - a->vendor_id) == 0)
+ result = b->product_id - a->product_id;
+
+ return (result);
+}
+
+
/*
* 'find_device()' - Find or enumerate USB printers.
*/
!devdesc.idProduct)
continue;
- printer.quirks = quirks(devdesc.idVendor, devdesc.idProduct);
+ printer.quirks = find_quirks(devdesc.idVendor, devdesc.idProduct);
/*
* Ignore blacklisted printers...
*/
- if (printer.quirks & USBLP_QUIRK_BLACKLIST)
+ if (printer.quirks & USB_QUIRK_BLACKLIST)
continue;
for (conf = 0; conf < devdesc.bNumConfigurations; conf ++)
if (((altptr->bInterfaceClass != LIBUSB_CLASS_PRINTER ||
altptr->bInterfaceSubClass != 1) &&
- ((printer.quirks & USBLP_QUIRK_BAD_CLASS) == 0)) ||
+ ((printer.quirks & USB_QUIRK_VENDOR_CLASS) == 0)) ||
(altptr->bInterfaceProtocol != 1 && /* Unidirectional */
altptr->bInterfaceProtocol != 2) || /* Bidirectional */
altptr->bInterfaceProtocol < protocol)
continue;
- if (printer.quirks & USBLP_QUIRK_BAD_CLASS)
+ if (printer.quirks & USB_QUIRK_VENDOR_CLASS)
fprintf(stderr, "DEBUG: Printer does not report class 7 and/or "
"subclass 1 but works as a printer anyway\n");
{
fprintf(stderr, "DEBUG: Device protocol: %d\n",
printer.protocol);
- if (printer.quirks & USBLP_QUIRK_BIDIR)
+ if (printer.quirks & USB_QUIRK_UNIDIR)
{
printer.read_endp = -1;
fprintf(stderr, "DEBUG: Printer reports bi-di support "
altsetting[printer.altset].
endpoint[printer.write_endp].
bEndpointAddress;
- if (printer.quirks & USBLP_QUIRK_NO_REATTACH)
+ if (printer.quirks & USB_QUIRK_NO_REATTACH)
{
printer.usblp_attached = 0;
fprintf(stderr, "DEBUG: Printer does not like usblp "
}
+/*
+ * 'find_quirks()' - Find the quirks for the given printer, if any.
+ *
+ * First looks for an exact match, then looks for the vendor ID wildcard match.
+ */
+
+static unsigned /* O - Quirks flags */
+find_quirks(int vendor_id, /* I - Vendor ID */
+ int product_id) /* I - Product ID */
+{
+ usb_quirk_t key, /* Search key */
+ *match; /* Matching quirk entry */
+
+
+ key.vendor_id = vendor_id;
+ key.product_id = product_id;
+
+ if ((match = cupsArrayFind(all_quirks, &key)) != NULL)
+ return (match->quirks);
+
+ key.product_id = 0;
+
+ if ((match = cupsArrayFind(all_quirks, &key)) != NULL)
+ return (match->quirks);
+
+ return (USB_QUIRK_WHITELIST);
+}
+
+
/*
* 'get_device_id()' - Get the IEEE-1284 device ID for the printer.
*/
}
+/*
+ * 'load_quirks()' - Load all quirks files in the /usr/share/cups/usb directory.
+ */
+
+static void
+load_quirks(void)
+{
+ const char *datadir; /* CUPS_DATADIR environment variable */
+ char filename[1024], /* Filename */
+ line[1024]; /* Line from file */
+ cups_dir_t *dir; /* Directory */
+ cups_dentry_t *dent; /* Directory entry */
+ cups_file_t *fp; /* Quirks file */
+ usb_quirk_t *quirk; /* New quirk */
+
+
+ all_quirks = cupsArrayNew((cups_array_func_t)compare_quirks, NULL);
+
+ if ((datadir = getenv("CUPS_DATADIR")) == NULL)
+ datadir = CUPS_DATADIR;
+
+ snprintf(filename, sizeof(filename), "%s/usb", datadir);
+ if ((dir = cupsDirOpen(filename)) == NULL)
+ {
+ perror(filename);
+ return;
+ }
+
+ fprintf(stderr, "DEBUG: Loading USB quirks from \"%s\".\n", filename);
+
+ while (dent = cupsDirRead(dir))
+ {
+ if (!S_ISREG(dent->fileinfo.st_mode))
+ continue;
+
+ snprintf(filename, sizeof(filename), "%s/usb/%s", datadir, dent->filename);
+ if ((fp = cupsFileOpen(filename, "r")) == NULL)
+ {
+ perror(filename);
+ continue;
+ }
+
+ while (cupsFileGets(fp, line, sizeof(line)))
+ {
+ /*
+ * Skip blank and comment lines...
+ */
+
+ if (line[0] == '#' || !line[0])
+ continue;
+
+ /*
+ * Add a quirk...
+ */
+
+ if ((quirk = calloc(1, sizeof(usb_quirk_t))) == NULL)
+ {
+ perror("DEBUG: Unable to allocate memory for quirk");
+ break;
+ }
+
+ if (sscanf(line, "%x%x", &quirk->vendor_id, &quirk->product_id) < 1)
+ {
+ fprintf(stderr, "DEBUG: Bad line: %s\n", line);
+ free(quirk);
+ continue;
+ }
+
+ if (strstr(line, " blacklist"))
+ quirk->quirks |= USB_QUIRK_BLACKLIST;
+
+ if (strstr(line, " no-reattach"))
+ quirk->quirks |= USB_QUIRK_NO_REATTACH;
+
+ if (strstr(line, " soft-reset"))
+ quirk->quirks |= USB_QUIRK_SOFT_RESET;
+
+ if (strstr(line, " unidir"))
+ quirk->quirks |= USB_QUIRK_UNIDIR;
+
+ if (strstr(line, " usb-init"))
+ quirk->quirks |= USB_QUIRK_USB_INIT;
+
+ if (strstr(line, " vendor-class"))
+ quirk->quirks |= USB_QUIRK_VENDOR_CLASS;
+
+ cupsArrayAdd(all_quirks, quirk);
+ }
+
+ cupsFileClose(fp);
+ }
+
+ fprintf(stderr, "DEBUG: Loaded %d quirks.\n", cupsArrayCount(all_quirks));
+
+ cupsDirClose(dir);
+}
+
+
/*
* 'make_device_uri()' - Create a device URI for a USB printer.
*/
}
-/*
- * 'printer_class_soft_reset()' - Do the soft reset request specific to printers
- *
- * This soft reset is specific to the printer device class and is much less
- * invasive than the general USB reset libusb_reset_device(). Especially it
- * does never happen that the USB addressing and configuration changes. What
- * is actually done is that all buffers get flushed and the bulk IN and OUT
- * pipes get reset to their default states. This clears all stall conditions.
- * See http://cholla.mmto.org/computers/linux/usb/usbprint11.pdf
- */
-
-static int /* O - 0 on success, < 0 on error */
-printer_class_soft_reset(usb_printer_t *printer) /* I - Printer */
-{
- struct libusb_config_descriptor *confptr = NULL;
- /* Pointer to current configuration */
- int interface,
- errcode;
-
- if (libusb_get_config_descriptor(printer->device, printer->conf, &confptr)
- < 0)
- interface = printer->iface;
- else
- interface = confptr->interface[printer->iface].
- altsetting[printer->altset].bInterfaceNumber;
- libusb_free_config_descriptor(confptr);
- if ((errcode = libusb_control_transfer(printer->handle,
- LIBUSB_REQUEST_TYPE_CLASS |
- LIBUSB_ENDPOINT_OUT |
- LIBUSB_RECIPIENT_OTHER,
- 2, 0, interface, NULL, 0, 5000)) < 0)
- errcode = libusb_control_transfer(printer->handle,
- LIBUSB_REQUEST_TYPE_CLASS |
- LIBUSB_ENDPOINT_OUT |
- LIBUSB_RECIPIENT_INTERFACE,
- 2, 0, interface, NULL, 0, 5000);
- return errcode;
-}
-
-
-/*
- * 'quirks()' - Get the known quirks of a given printer model
- */
-
-static unsigned int quirks(int vendor, int product)
-{
- int i;
-
- for (i = 0; quirk_printers[i].vendorId; i++)
- {
- if (vendor == quirk_printers[i].vendorId &&
- (quirk_printers[i].productId == 0x0000 ||
- product == quirk_printers[i].productId))
- return quirk_printers[i].quirks;
- }
- return 0;
-}
-
-
/*
* 'read_thread()' - Thread to read the backchannel data on.
*/
* 'soft_reset()' - Send a soft reset to the device.
*/
-static void soft_reset(void)
+static void
+soft_reset(void)
{
fd_set input_set; /* Input set for select() */
struct timeval tv; /* Time value */
char buffer[2048]; /* Buffer */
struct timespec cond_timeout; /* pthread condition timeout */
+
/*
* Send an abort once a second until the I/O lock is released by the main
* thread...
* Send the reset...
*/
- printer_class_soft_reset(g.printer);
+ soft_reset_printer(g.printer);
/*
* Release the I/O lock...
}
+/*
+ * 'soft_reset_printer()' - Do the soft reset request specific to printers
+ *
+ * This soft reset is specific to the printer device class and is much less
+ * invasive than the general USB reset libusb_reset_device(). Especially it
+ * does never happen that the USB addressing and configuration changes. What
+ * is actually done is that all buffers get flushed and the bulk IN and OUT
+ * pipes get reset to their default states. This clears all stall conditions.
+ * See http://cholla.mmto.org/computers/linux/usb/usbprint11.pdf
+ */
+
+static int /* O - 0 on success, < 0 on error */
+soft_reset_printer(
+ usb_printer_t *printer) /* I - Printer */
+{
+ struct libusb_config_descriptor *confptr = NULL;
+ /* Pointer to current configuration */
+ int interface, /* Interface to reset */
+ errcode; /* Error code */
+
+
+ if (libusb_get_config_descriptor(printer->device, printer->conf,
+ &confptr) < 0)
+ interface = printer->iface;
+ else
+ interface = confptr->interface[printer->iface].
+ altsetting[printer->altset].bInterfaceNumber;
+
+ libusb_free_config_descriptor(confptr);
+
+ if ((errcode = libusb_control_transfer(printer->handle,
+ LIBUSB_REQUEST_TYPE_CLASS |
+ LIBUSB_ENDPOINT_OUT |
+ LIBUSB_RECIPIENT_OTHER,
+ 2, 0, interface, NULL, 0, 5000)) < 0)
+ errcode = libusb_control_transfer(printer->handle,
+ LIBUSB_REQUEST_TYPE_CLASS |
+ LIBUSB_ENDPOINT_OUT |
+ LIBUSB_RECIPIENT_INTERFACE,
+ 2, 0, interface, NULL, 0, 5000);
+
+ return (errcode);
+}
+
+
/*
* End of "$Id$".
*/
projects / thirdparty / cups.git / commitdiff
