USB: Serial: cypress_M8: Enable FRWD Dongle hidcom device

The patch adds a new HIDCOM device and does not affect other devices
driven by the cypress_M8 module. Changes are:
- add VendorID ProductID to device tables
- skip unstable speed check because FRWD uses 115200bps
- skip reset at probe which is an issue workaround for this
particular device.

Signed-off-by: Robert Butora <robert.butora.fi@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index d341555..0821201 100644 (file)
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -65,6 +65,7 @@ static const struct usb_device_id id_table_earthmate[] = {
 static const struct usb_device_id id_table_cyphidcomrs232[] = {
        { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
        { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
+       { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
        { }                                             /* Terminating entry */
 };
 
@@ -78,6 +79,7 @@ static const struct usb_device_id id_table_combined[] = {
        { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
        { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
        { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
+       { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
        { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
        { }                                             /* Terminating entry */
 };
@@ -229,6 +231,12 @@ static struct usb_serial_driver * const serial_drivers[] = {
  * Cypress serial helper functions
  *****************************************************************************/
 
+/* FRWD Dongle hidcom needs to skip reset and speed checks */
+static inline bool is_frwd(struct usb_device *dev)
+{
+       return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
+               (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
+}
 
 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
 {
@@ -238,6 +246,10 @@ static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
        if (unstable_bauds)
                return new_rate;
 
+       /* FRWD Dongle uses 115200 bps */
+       if (is_frwd(port->serial->dev))
+               return new_rate;
+
        /*
         * The general purpose firmware for the Cypress M8 allows for
         * a maximum speed of 57600bps (I have no idea whether DeLorme
@@ -448,7 +460,11 @@ static int cypress_generic_port_probe(struct usb_serial_port *port)
                return -ENOMEM;
        }
 
-       usb_reset_configuration(serial->dev);
+       /* Skip reset for FRWD device. It is a workaound:
+          device hangs if it receives SET_CONFIGURE in Configured
+          state. */
+       if (!is_frwd(serial->dev))
+               usb_reset_configuration(serial->dev);
 
        priv->cmd_ctrl = 0;
        priv->line_control = 0;

diff --git a/drivers/usb/serial/cypress_m8.h b/drivers/usb/serial/cypress_m8.h
index 67cf608..b461311 100644 (file)
--- a/drivers/usb/serial/cypress_m8.h
+++ b/drivers/usb/serial/cypress_m8.h
@@ -24,6 +24,10 @@
 #define VENDOR_ID_CYPRESS              0x04b4
 #define PRODUCT_ID_CYPHIDCOM           0x5500
 
+/* FRWD Dongle - a GPS sports watch */
+#define VENDOR_ID_FRWD                 0x6737
+#define PRODUCT_ID_CYPHIDCOM_FRWD      0x0001
+
 /* Powercom UPS, chip CY7C63723 */
 #define VENDOR_ID_POWERCOM             0x0d9f
 #define PRODUCT_ID_UPS                 0x0002