[PATCH] USB: Export IEEE-1284 device id in sysfs for usblp devices
I looked at the userspace code which uses the LPIOC_GET_DEVICE_ID ioctl
and I almost went blind. Let's export it in sysfs instead, and just as a
string instead of with a big-endian length at the beginning of it.
This also prints the message about finding the printer _after_ we know
the minor device number it's going to have, rather than reporting all
printers as 'usblp0'.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
index 708a292..27e9404 100644
--- a/drivers/usb/class/usblp.c
+++ b/drivers/usb/class/usblp.c
@@ -850,6 +850,20 @@
.minor_base = USBLP_MINOR_BASE,
};
+static ssize_t usblp_show_ieee1284_id(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(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
+
static int usblp_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
@@ -934,20 +948,12 @@
/* Retrieve and store the device ID string. */
usblp_cache_device_id_string(usblp);
+ device_create_file(&intf->dev, &dev_attr_ieee1284_id);
#ifdef DEBUG
usblp_check_status(usblp, 0);
#endif
- info("usblp%d: USB %sdirectional printer dev %d "
- "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
- usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
- usblp->ifnum,
- usblp->protocol[usblp->current_protocol].alt_setting,
- usblp->current_protocol,
- le16_to_cpu(usblp->dev->descriptor.idVendor),
- le16_to_cpu(usblp->dev->descriptor.idProduct));
-
usb_set_intfdata (intf, usblp);
usblp->present = 1;
@@ -958,11 +964,20 @@
goto abort_intfdata;
}
usblp->minor = intf->minor;
+ info("usblp%d: USB %sdirectional printer dev %d "
+ "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
+ 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:
if (usblp) {
if (usblp->writebuf)
@@ -1157,6 +1172,8 @@
BUG ();
}
+ device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
+
down (&usblp_sem);
down (&usblp->sem);
usblp->present = 0;