cdc-acm: Add support of ATOL FPrint fiscal printers

commit 15bf722e upstream.

ATOL FPrint fiscal printers require usb_clear_halt to be executed
to work properly. Add quirk to fix the issue.
Signed-off-by: Alexey Sokolov <sokolov@7pikes.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ kamal: backport to 3.13-stable: decimal const instead of BIT() ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

drivers/usb/class/cdc-acm.c

@@ -1336,6 +1336,11 @@ static int acm_probe(struct usb_interface *intf,
 		goto alloc_fail8;
 	}
 
+	if (quirks & CLEAR_HALT_CONDITIONS) {
+		usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
+		usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
+	}
+
 	return 0;
 alloc_fail8:
 	if (acm->country_codes) {
@@ -1622,6 +1627,10 @@ static const struct usb_device_id acm_ids[] = {
 	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
 	},
 
+	{ USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
+	.driver_info = CLEAR_HALT_CONDITIONS,
+	},
+
 	/* Nokia S60 phones expose two ACM channels. The first is
 	 * a modem and is picked up by the standard AT-command
 	 * information below. The second is 'vendor-specific' but

drivers/usb/class/cdc-acm.h

@@ -129,3 +129,4 @@ struct acm {
 #define NOT_A_MODEM			8
 #define NO_DATA_INTERFACE		16
 #define IGNORE_DEVICE			32
+#define CLEAR_HALT_CONDITIONS		128