USB: cdc-acm - blacklist IMS PCU device

The IMS PCU (Passenger Control Unit) device used custom protocol over serial
line, so it is presenting itself as CDC ACM device.

Now that we have proper in-kernel driver for it we need to black-list the
device in cdc-acm driver.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

2 files changed, 14 insertions, 0 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 6e49ec6f3adc..278bf5256a95 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -949,6 +949,10 @@ static int acm_probe(struct usb_interface *intf,
 
         /* normal quirks */
         quirks = (unsigned long)id->driver_info;
+
+        if (quirks == IGNORE_DEVICE)
+                return -ENODEV;
+
         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
 
         /* handle quirks deadly to normal probing*/
@@ -1650,6 +1654,15 @@ static const struct usb_device_id acm_ids[] = {
         .driver_info = NO_DATA_INTERFACE,
         },
 
+#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
+        { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
+        .driver_info = IGNORE_DEVICE,
+        },
+        { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
+        .driver_info = IGNORE_DEVICE,
+        },
+#endif
+
         /* control interfaces without any protocol set */
         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
                 USB_CDC_PROTO_NONE) },
diff --git a/drivers/usb/class/cdc-acm.h b/drivers/usb/class/cdc-acm.h
index 35ef887b7417..0f76e4af600e 100644
--- a/drivers/usb/class/cdc-acm.h
+++ b/drivers/usb/class/cdc-acm.h
@@ -128,3 +128,4 @@ struct acm {
 #define NO_CAP_LINE                     4
 #define NOT_A_MODEM                     8
 #define NO_DATA_INTERFACE               16
+#define IGNORE_DEVICE                   32