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authorRobert Butora <robert.butora.fi@gmail.com>2013-05-31 19:09:51 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-06-03 21:33:10 +0400
commit6529591e3eef65f0f528a81ac169f6e294b947a7 (patch)
tree69c78c0c918fef40b1b50a5c0079f9db4466733a /drivers/usb/serial/cypress_m8.c
parent077f5f1c23b3cf1134c031677497dfb6077e6bdd (diff)
downloadlinux-6529591e3eef65f0f528a81ac169f6e294b947a7.tar.xz
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>
Diffstat (limited to 'drivers/usb/serial/cypress_m8.c')
-rw-r--r--drivers/usb/serial/cypress_m8.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index d341555d37d8..082120198f87 100644
--- 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;