USB: Add support for Olimex arm-usb-ocd JTAG interface serial port
This patch adds support for the serial port on Olimex arm-usb-ocd
JTAG interface.
The device appears as two serial ports, but the first one is reserved
for the JTAG interface. The JTAG interface can be used with OpenOCD
from userspace. For more information, please see:
http://openocd.berlios.de/web/
http://www.olimex.com/dev/arm-usb-ocd.html
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 128c20a..2353679 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -273,12 +273,18 @@
/* struct ftdi_sio_quirk is used by devices requiring special attention. */
struct ftdi_sio_quirk {
+ int (*probe)(struct usb_serial *);
void (*setup)(struct usb_serial *); /* Special settings during startup. */
};
+static int ftdi_olimex_probe (struct usb_serial *serial);
static void ftdi_USB_UIRT_setup (struct usb_serial *serial);
static void ftdi_HE_TIRA1_setup (struct usb_serial *serial);
+static struct ftdi_sio_quirk ftdi_olimex_quirk = {
+ .probe = ftdi_olimex_probe,
+};
+
static struct ftdi_sio_quirk ftdi_USB_UIRT_quirk = {
.setup = ftdi_USB_UIRT_setup,
};
@@ -527,6 +533,8 @@
{ USB_DEVICE(ELEKTOR_VID, ELEKTOR_FT323R_PID) },
{ USB_DEVICE(TELLDUS_VID, TELLDUS_TELLSTICK_PID) },
{ USB_DEVICE(FTDI_VID, FTDI_MAXSTREAM_PID) },
+ { USB_DEVICE(OLIMEX_VID, OLIMEX_ARM_USB_OCD_PID),
+ .driver_info = (kernel_ulong_t)&ftdi_olimex_quirk },
{ }, /* Optional parameter entry */
{ } /* Terminating entry */
};
@@ -671,7 +679,7 @@
/*
* ***************************************************************************
- * Utlity functions
+ * Utility functions
* ***************************************************************************
*/
@@ -1173,9 +1181,17 @@
/* Probe function to check for special devices */
static int ftdi_sio_probe (struct usb_serial *serial, const struct usb_device_id *id)
{
+ struct ftdi_sio_quirk *quirk = (struct ftdi_sio_quirk *)id->driver_info;
+
+ if (quirk && quirk->probe) {
+ int ret = quirk->probe(serial);
+ if (ret != 0)
+ return ret;
+ }
+
usb_set_serial_data(serial, (void *)id->driver_info);
- return (0);
+ return 0;
}
static int ftdi_sio_port_probe(struct usb_serial_port *port)
@@ -1270,6 +1286,24 @@
priv->force_rtscts = 1;
} /* ftdi_HE_TIRA1_setup */
+/*
+ * First port on Olimex arm-usb-ocd is reserved for JTAG interface
+ * and can be accessed from userspace using openocd.
+ */
+static int ftdi_olimex_probe(struct usb_serial *serial)
+{
+ struct usb_device *udev = serial->dev;
+ struct usb_interface *interface = serial->interface;
+
+ dbg("%s",__FUNCTION__);
+
+ if (interface == udev->actconfig->interface[0]) {
+ info("Ignoring reserved serial port on Olimex arm-usb-ocd\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
/* ftdi_shutdown is called from usbserial:usb_serial_disconnect
* it is called when the usb device is disconnected
