cdc-acm: Add support of ATOL FPrint fiscal printers

commit 15bf722e6f6c0b884521a0363204532e849deb7f 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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 57d6302..ca666d0 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1295,6 +1295,11 @@ skip_countries:
 
        acm_table[minor] = acm;
 
+       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_fail7:
        for (i = 0; i < ACM_NW; i++)
@@ -1574,6 +1579,10 @@ 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

diff --git a/drivers/usb/class/cdc-acm.h b/drivers/usb/class/cdc-acm.h
index c3f1b36..7aa5e9a 100644 (file)
--- a/drivers/usb/class/cdc-acm.h
+++ b/drivers/usb/class/cdc-acm.h
@@ -127,3 +127,4 @@ struct acm {
 #define NO_CAP_LINE                    4
 #define NOT_A_MODEM                    8
 #define NO_DATA_INTERFACE              16
+#define CLEAR_HALT_CONDITIONS          BIT(7)