#include <linux/usb/serial.h>
#include <asm/uaccess.h>
+static int generic_probe(struct usb_interface *interface,
+ const struct usb_device_id *id);
+
+
static int debug;
#ifdef CONFIG_USB_SERIAL_GENERIC
static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */
+/* we want to look at all devices, as the vendor/product id can change
+ * depending on the command line argument */
+static struct usb_device_id generic_serial_ids[] = {
+ {.driver_info = 42},
+ {}
+};
+
+static struct usb_driver generic_driver = {
+ .name = "usbserial_generic",
+ .probe = generic_probe,
+ .disconnect = usb_serial_disconnect,
+ .id_table = generic_serial_ids,
+ .no_dynamic_id = 1,
+};
+
/* All of the device info needed for the Generic Serial Converter */
struct usb_serial_driver usb_serial_generic_device = {
.driver = {
.name = "generic",
},
.id_table = generic_device_ids,
+ .usb_driver = &generic_driver,
.num_interrupt_in = NUM_DONT_CARE,
.num_bulk_in = NUM_DONT_CARE,
.num_bulk_out = NUM_DONT_CARE,
.num_ports = 1,
.shutdown = usb_serial_generic_shutdown,
-};
-
-/* we want to look at all devices, as the vendor/product id can change
- * depending on the command line argument */
-static struct usb_device_id generic_serial_ids[] = {
- {.driver_info = 42},
- {}
+ .throttle = usb_serial_generic_throttle,
+ .unthrottle = usb_serial_generic_unthrottle,
};
static int generic_probe(struct usb_interface *interface,
return usb_serial_probe(interface, id);
return -ENODEV;
}
-
-static struct usb_driver generic_driver = {
- .name = "usbserial_generic",
- .probe = generic_probe,
- .disconnect = usb_serial_disconnect,
- .id_table = generic_serial_ids,
- .no_dynamic_id = 1,
-};
#endif
int usb_serial_generic_register (int _debug)
{
struct usb_serial *serial = port->serial;
int result = 0;
+ unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
if (port->tty)
port->tty->low_latency = 1;
- /* if we have a bulk interrupt, start reading from it */
+ /* clear the throttle flags */
+ spin_lock_irqsave(&port->lock, flags);
+ port->throttled = 0;
+ port->throttle_req = 0;
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ /* if we have a bulk endpoint, start reading from it */
if (serial->num_bulk_in) {
/* Start reading from the device */
usb_fill_bulk_urb (port->read_urb, serial->dev,
/* only do something if we have a bulk out endpoint */
if (serial->num_bulk_out) {
- spin_lock(&port->lock);
+ spin_lock_bh(&port->lock);
if (port->write_urb_busy) {
- spin_unlock(&port->lock);
+ spin_unlock_bh(&port->lock);
dbg("%s - already writing", __FUNCTION__);
return 0;
}
port->write_urb_busy = 1;
- spin_unlock(&port->lock);
+ spin_unlock_bh(&port->lock);
count = (count > port->bulk_out_size) ? port->bulk_out_size : count;
return (chars);
}
-void usb_serial_generic_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
+/* Push data to tty layer and resubmit the bulk read URB */
+static void flush_and_resubmit_read_urb (struct usb_serial_port *port)
{
- struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
struct usb_serial *serial = port->serial;
- struct tty_struct *tty;
- unsigned char *data = urb->transfer_buffer;
+ struct urb *urb = port->read_urb;
+ struct tty_struct *tty = port->tty;
int result;
- dbg("%s - port %d", __FUNCTION__, port->number);
-
- if (urb->status) {
- dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
- return;
- }
-
- usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
-
- tty = port->tty;
+ /* Push data to tty */
if (tty && urb->actual_length) {
tty_buffer_request_room(tty, urb->actual_length);
- tty_insert_flip_string(tty, data, urb->actual_length);
- tty_flip_buffer_push(tty);
+ tty_insert_flip_string(tty, urb->transfer_buffer, urb->actual_length);
+ tty_flip_buffer_push(tty); /* is this allowed from an URB callback ? */
}
- /* Continue trying to always read */
+ /* Continue reading from device */
usb_fill_bulk_urb (port->read_urb, serial->dev,
usb_rcvbulkpipe (serial->dev,
port->bulk_in_endpointAddress),
if (result)
dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
}
+
+void usb_serial_generic_read_bulk_callback (struct urb *urb)
+{
+ struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+ unsigned char *data = urb->transfer_buffer;
+ int is_throttled;
+ unsigned long flags;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ if (urb->status) {
+ dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
+ return;
+ }
+
+ usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
+
+ /* Throttle the device if requested by tty */
+ if (urb->actual_length) {
+ spin_lock_irqsave(&port->lock, flags);
+ is_throttled = port->throttled = port->throttle_req;
+ spin_unlock_irqrestore(&port->lock, flags);
+ if (is_throttled) {
+ /* Let the received data linger in the read URB;
+ * usb_serial_generic_unthrottle() will pick it
+ * up later. */
+ dbg("%s - throttling device", __FUNCTION__);
+ return;
+ }
+ }
+
+ /* Handle data and continue reading from device */
+ flush_and_resubmit_read_urb(port);
+}
EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
-void usb_serial_generic_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
+void usb_serial_generic_write_bulk_callback (struct urb *urb)
{
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
}
EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);
+void usb_serial_generic_throttle (struct usb_serial_port *port)
+{
+ unsigned long flags;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ /* Set the throttle request flag. It will be picked up
+ * by usb_serial_generic_read_bulk_callback(). */
+ spin_lock_irqsave(&port->lock, flags);
+ port->throttle_req = 1;
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+void usb_serial_generic_unthrottle (struct usb_serial_port *port)
+{
+ int was_throttled;
+ unsigned long flags;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ /* Clear the throttle flags */
+ spin_lock_irqsave(&port->lock, flags);
+ was_throttled = port->throttled;
+ port->throttled = port->throttle_req = 0;
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ if (was_throttled) {
+ /* Handle pending data and resume reading from device */
+ flush_and_resubmit_read_urb(port);
+ }
+}
+
void usb_serial_generic_shutdown (struct usb_serial *serial)
{
int i;
projects / powerpc.git / blobdiff