#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
-#include <linux/smp_lock.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
+#include <linux/kfifo.h>
#include "pl2303.h"
/*
.suspend = usb_serial_suspend,
.resume = usb_serial_resume,
.no_dynamic_id = 1,
+ .supports_autosuspend = 1,
};
/* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead
if (serial->minor != SERIAL_TTY_NO_MINOR)
return_serial(serial);
- serial->type->release(serial);
+ if (serial->attached)
+ serial->type->release(serial);
/* Now that nothing is using the ports, they can be freed */
for (i = 0; i < serial->num_port_pointers; ++i) {
* This is the first place a new tty gets used. Hence this is where we
* acquire references to the usb_serial structure and the driver module,
* where we store a pointer to the port, and where we do an autoresume.
- * All these actions are reversed in serial_release().
+ * All these actions are reversed in serial_cleanup().
*/
static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
{
return retval;
}
-static int serial_open(struct tty_struct *tty, struct file *filp)
+static int serial_activate(struct tty_port *tport, struct tty_struct *tty)
{
- struct usb_serial_port *port = tty->driver_data;
+ struct usb_serial_port *port =
+ container_of(tport, struct usb_serial_port, port);
struct usb_serial *serial = port->serial;
int retval;
- dbg("%s - port %d", __func__, port->number);
-
- spin_lock_irq(&port->port.lock);
- if (!tty_hung_up_p(filp))
- ++port->port.count;
- spin_unlock_irq(&port->port.lock);
- tty_port_tty_set(&port->port, tty);
+ mutex_lock(&serial->disc_mutex);
+ if (serial->disconnected)
+ retval = -ENODEV;
+ else
+ retval = port->serial->type->open(tty, port);
+ mutex_unlock(&serial->disc_mutex);
+ return retval;
+}
- /* Do the device-specific open only if the hardware isn't
- * already initialized.
- */
- if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) {
- if (mutex_lock_interruptible(&port->mutex))
- return -ERESTARTSYS;
- mutex_lock(&serial->disc_mutex);
- if (serial->disconnected)
- retval = -ENODEV;
- else
- retval = port->serial->type->open(tty, port);
- mutex_unlock(&serial->disc_mutex);
- mutex_unlock(&port->mutex);
- if (retval)
- return retval;
- set_bit(ASYNCB_INITIALIZED, &port->port.flags);
- }
+static int serial_open(struct tty_struct *tty, struct file *filp)
+{
+ struct usb_serial_port *port = tty->driver_data;
- /* Now do the correct tty layer semantics */
- retval = tty_port_block_til_ready(&port->port, tty, filp);
- return retval;
+ dbg("%s - port %d", __func__, port->number);
+ return tty_port_open(&port->port, tty, filp);
}
/**
* serial_down - shut down hardware
- * @port: port to shut down
+ * @tport: tty port to shut down
*
* Shut down a USB serial port unless it is the console. We never
- * shut down the console hardware as it will always be in use.
+ * shut down the console hardware as it will always be in use. Serialized
+ * against activate by the tport mutex and kept to matching open/close pairs
+ * of calls by the ASYNCB_INITIALIZED flag.
*/
-static void serial_down(struct usb_serial_port *port)
+static void serial_down(struct tty_port *tport)
{
+ struct usb_serial_port *port =
+ container_of(tport, struct usb_serial_port, port);
struct usb_serial_driver *drv = port->serial->type;
- struct usb_serial *serial;
- struct module *owner;
-
/*
* The console is magical. Do not hang up the console hardware
* or there will be tears.
*/
- if (port->console)
- return;
-
- /* Don't call the close method if the hardware hasn't been
- * initialized.
- */
- if (!test_and_clear_bit(ASYNCB_INITIALIZED, &port->port.flags))
+ if (port->port.console)
return;
-
- mutex_lock(&port->mutex);
- serial = port->serial;
- owner = serial->type->driver.owner;
-
if (drv->close)
drv->close(port);
-
- mutex_unlock(&port->mutex);
}
static void serial_hangup(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
-
dbg("%s - port %d", __func__, port->number);
-
- serial_down(port);
tty_port_hangup(&port->port);
}
static void serial_close(struct tty_struct *tty, struct file *filp)
{
struct usb_serial_port *port = tty->driver_data;
-
dbg("%s - port %d", __func__, port->number);
-
- if (tty_hung_up_p(filp))
- return;
- if (tty_port_close_start(&port->port, tty, filp) == 0)
- return;
- serial_down(port);
- tty_port_close_end(&port->port, tty);
- tty_port_tty_set(&port->port, NULL);
+ tty_port_close(&port->port, tty, filp);
}
/**
- * serial_release - free resources post close/hangup
+ * serial_cleanup - free resources post close/hangup
* @port: port to free up
*
* Do the resource freeing and refcount dropping for the port.
* Avoid freeing the console.
*
- * Called when the last tty kref is dropped.
+ * Called asynchronously after the last tty kref is dropped,
+ * and the tty layer has already done the tty_shutdown(tty);
*/
-static void serial_release(struct tty_struct *tty)
+static void serial_cleanup(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial;
/* The console is magical. Do not hang up the console hardware
* or there will be tears.
*/
- if (port->console)
+ if (port->port.console)
return;
dbg("%s - port %d", __func__, port->number);
- /* Standard shutdown processing */
- tty_shutdown(tty);
-
tty->driver_data = NULL;
serial = port->serial;
dbg("%s - port %d, %d byte(s)", __func__, port->number, count);
- /* count is managed under the mutex lock for the tty so cannot
- drop to zero until after the last close completes */
- WARN_ON(!port->port.count);
-
/* pass on to the driver specific version of this function */
retval = port->serial->type->write(tty, port, buf, count);
{
struct usb_serial_port *port = tty->driver_data;
dbg("%s - port %d", __func__, port->number);
- WARN_ON(!port->port.count);
/* pass on to the driver specific version of this function */
return port->serial->type->write_room(tty);
}
static int serial_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
- dbg("%s = port %d", __func__, port->number);
+ dbg("%s - port %d", __func__, port->number);
/* if the device was unplugged then any remaining characters
fell out of the connector ;) */
struct usb_serial_port *port = tty->driver_data;
dbg("%s - port %d", __func__, port->number);
- WARN_ON(!port->port.count);
/* pass on to the driver specific version of this function */
if (port->serial->type->throttle)
port->serial->type->throttle(tty);
struct usb_serial_port *port = tty->driver_data;
dbg("%s - port %d", __func__, port->number);
- WARN_ON(!port->port.count);
/* pass on to the driver specific version of this function */
if (port->serial->type->unthrottle)
port->serial->type->unthrottle(tty);
}
-static int serial_ioctl(struct tty_struct *tty, struct file *file,
+static int serial_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
- WARN_ON(!port->port.count);
-
/* pass on to the driver specific version of this function
if it is available */
if (port->serial->type->ioctl) {
- retval = port->serial->type->ioctl(tty, file, cmd, arg);
+ retval = port->serial->type->ioctl(tty, cmd, arg);
} else
retval = -ENOIOCTLCMD;
return retval;
struct usb_serial_port *port = tty->driver_data;
dbg("%s - port %d", __func__, port->number);
- WARN_ON(!port->port.count);
/* pass on to the driver specific version of this function
if it is available */
if (port->serial->type->set_termios)
dbg("%s - port %d", __func__, port->number);
- WARN_ON(!port->port.count);
/* pass on to the driver specific version of this function
if it is available */
if (port->serial->type->break_ctl)
.release = single_release,
};
-static int serial_tiocmget(struct tty_struct *tty, struct file *file)
+static int serial_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
dbg("%s - port %d", __func__, port->number);
- WARN_ON(!port->port.count);
if (port->serial->type->tiocmget)
- return port->serial->type->tiocmget(tty, file);
+ return port->serial->type->tiocmget(tty);
return -EINVAL;
}
-static int serial_tiocmset(struct tty_struct *tty, struct file *file,
+static int serial_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
dbg("%s - port %d", __func__, port->number);
- WARN_ON(!port->port.count);
if (port->serial->type->tiocmset)
- return port->serial->type->tiocmset(tty, file, set, clear);
+ return port->serial->type->tiocmset(tty, set, clear);
+ return -EINVAL;
+}
+
+static int serial_get_icount(struct tty_struct *tty,
+ struct serial_icounter_struct *icount)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ if (port->serial->type->get_icount)
+ return port->serial->type->get_icount(tty, icount);
return -EINVAL;
}
static void kill_traffic(struct usb_serial_port *port)
{
+ int i;
+
usb_kill_urb(port->read_urb);
usb_kill_urb(port->write_urb);
+ for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
+ usb_kill_urb(port->write_urbs[i]);
/*
* This is tricky.
* Some drivers submit the read_urb in the
static void port_release(struct device *dev)
{
struct usb_serial_port *port = to_usb_serial_port(dev);
+ int i;
dbg ("%s - %s", __func__, dev_name(dev));
usb_free_urb(port->write_urb);
usb_free_urb(port->interrupt_in_urb);
usb_free_urb(port->interrupt_out_urb);
+ for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
+ usb_free_urb(port->write_urbs[i]);
+ kfree(port->bulk_out_buffers[i]);
+ }
+ kfifo_free(&port->write_fifo);
kfree(port->bulk_in_buffer);
kfree(port->bulk_out_buffer);
kfree(port->interrupt_in_buffer);
return id;
}
+/* Caller must hold table_lock */
static struct usb_serial_driver *search_serial_device(
struct usb_interface *iface)
{
static const struct tty_port_operations serial_port_ops = {
.carrier_raised = serial_carrier_raised,
.dtr_rts = serial_dtr_rts,
+ .activate = serial_activate,
+ .shutdown = serial_down,
};
int usb_serial_probe(struct usb_interface *interface,
int num_ports = 0;
int max_endpoints;
- lock_kernel(); /* guard against unloading a serial driver module */
+ mutex_lock(&table_lock);
type = search_serial_device(interface);
if (!type) {
- unlock_kernel();
+ mutex_unlock(&table_lock);
dbg("none matched");
return -ENODEV;
}
+ if (!try_module_get(type->driver.owner)) {
+ mutex_unlock(&table_lock);
+ dev_err(&interface->dev, "module get failed, exiting\n");
+ return -EIO;
+ }
+ mutex_unlock(&table_lock);
+
serial = create_serial(dev, interface, type);
if (!serial) {
- unlock_kernel();
+ module_put(type->driver.owner);
dev_err(&interface->dev, "%s - out of memory\n", __func__);
return -ENOMEM;
}
if (type->probe) {
const struct usb_device_id *id;
- if (!try_module_get(type->driver.owner)) {
- unlock_kernel();
- dev_err(&interface->dev,
- "module get failed, exiting\n");
- kfree(serial);
- return -EIO;
- }
-
id = get_iface_id(type, interface);
retval = type->probe(serial, id);
- module_put(type->driver.owner);
if (retval) {
- unlock_kernel();
dbg("sub driver rejected device");
kfree(serial);
+ module_put(type->driver.owner);
return retval;
}
}
* properly during a later invocation of usb_serial_probe
*/
if (num_bulk_in == 0 || num_bulk_out == 0) {
- unlock_kernel();
dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n");
kfree(serial);
+ module_put(type->driver.owner);
return -ENODEV;
}
}
if (type == &usb_serial_generic_device) {
num_ports = num_bulk_out;
if (num_ports == 0) {
- unlock_kernel();
dev_err(&interface->dev,
"Generic device with no bulk out, not allowed.\n");
kfree(serial);
+ module_put(type->driver.owner);
return -EIO;
}
}
#endif
if (!num_ports) {
/* if this device type has a calc_num_ports function, call it */
- if (type->calc_num_ports) {
- if (!try_module_get(type->driver.owner)) {
- unlock_kernel();
- dev_err(&interface->dev,
- "module get failed, exiting\n");
- kfree(serial);
- return -EIO;
- }
+ if (type->calc_num_ports)
num_ports = type->calc_num_ports(serial);
- module_put(type->driver.owner);
- }
if (!num_ports)
num_ports = type->num_ports;
}
max_endpoints = max(max_endpoints, num_interrupt_out);
max_endpoints = max(max_endpoints, (int)serial->num_ports);
serial->num_port_pointers = max_endpoints;
- unlock_kernel();
dbg("%s - setting up %d port structures for this device",
__func__, max_endpoints);
port->port.ops = &serial_port_ops;
port->serial = serial;
spin_lock_init(&port->lock);
- mutex_init(&port->mutex);
+ /* Keep this for private driver use for the moment but
+ should probably go away */
INIT_WORK(&port->work, usb_serial_port_work);
serial->port[i] = port;
port->dev.parent = &interface->dev;
dev_err(&interface->dev, "No free urbs available\n");
goto probe_error;
}
- buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+ buffer_size = max_t(int, serial->type->bulk_in_size,
+ usb_endpoint_maxp(endpoint));
port->bulk_in_size = buffer_size;
port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
port->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
}
for (i = 0; i < num_bulk_out; ++i) {
+ int j;
+
endpoint = bulk_out_endpoint[i];
port = serial->port[i];
port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
dev_err(&interface->dev, "No free urbs available\n");
goto probe_error;
}
- buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+ if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
+ goto probe_error;
+ buffer_size = serial->type->bulk_out_size;
+ if (!buffer_size)
+ buffer_size = usb_endpoint_maxp(endpoint);
port->bulk_out_size = buffer_size;
port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
port->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
endpoint->bEndpointAddress),
port->bulk_out_buffer, buffer_size,
serial->type->write_bulk_callback, port);
+ for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
+ set_bit(j, &port->write_urbs_free);
+ port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
+ if (!port->write_urbs[j]) {
+ dev_err(&interface->dev,
+ "No free urbs available\n");
+ goto probe_error;
+ }
+ port->bulk_out_buffers[j] = kmalloc(buffer_size,
+ GFP_KERNEL);
+ if (!port->bulk_out_buffers[j]) {
+ dev_err(&interface->dev,
+ "Couldn't allocate bulk_out_buffer\n");
+ goto probe_error;
+ }
+ usb_fill_bulk_urb(port->write_urbs[j], dev,
+ usb_sndbulkpipe(dev,
+ endpoint->bEndpointAddress),
+ port->bulk_out_buffers[j], buffer_size,
+ serial->type->write_bulk_callback,
+ port);
+ }
}
if (serial->type->read_int_callback) {
"No free urbs available\n");
goto probe_error;
}
- buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+ buffer_size = usb_endpoint_maxp(endpoint);
port->interrupt_in_endpointAddress =
endpoint->bEndpointAddress;
port->interrupt_in_buffer = kmalloc(buffer_size,
"No free urbs available\n");
goto probe_error;
}
- buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+ buffer_size = usb_endpoint_maxp(endpoint);
port->interrupt_out_size = buffer_size;
port->interrupt_out_endpointAddress =
endpoint->bEndpointAddress;
/* if this device type has an attach function, call it */
if (type->attach) {
- if (!try_module_get(type->driver.owner)) {
- dev_err(&interface->dev,
- "module get failed, exiting\n");
- goto probe_error;
- }
retval = type->attach(serial);
- module_put(type->driver.owner);
if (retval < 0)
goto probe_error;
+ serial->attached = 1;
if (retval > 0) {
/* quietly accept this device, but don't bind to a
serial port as it's about to disappear */
serial->num_ports = 0;
goto exit;
}
+ } else {
+ serial->attached = 1;
}
+ /* Avoid race with tty_open and serial_install by setting the
+ * disconnected flag and not clearing it until all ports have been
+ * registered.
+ */
+ serial->disconnected = 1;
+
if (get_free_serial(serial, num_ports, &minor) == NULL) {
dev_err(&interface->dev, "No more free serial devices\n");
goto probe_error;
dev_set_name(&port->dev, "ttyUSB%d", port->number);
dbg ("%s - registering %s", __func__, dev_name(&port->dev));
port->dev_state = PORT_REGISTERING;
+ device_enable_async_suspend(&port->dev);
+
retval = device_add(&port->dev);
if (retval) {
dev_err(&port->dev, "Error registering port device, "
}
}
+ serial->disconnected = 0;
+
usb_serial_console_init(debug, minor);
exit:
/* success */
usb_set_intfdata(interface, serial);
+ module_put(type->driver.owner);
return 0;
probe_error:
usb_serial_put(serial);
+ module_put(type->driver.owner);
return -EIO;
}
EXPORT_SYMBOL_GPL(usb_serial_probe);
serial->suspending = 1;
+ if (serial->type->suspend) {
+ r = serial->type->suspend(serial, message);
+ if (r < 0) {
+ serial->suspending = 0;
+ goto err_out;
+ }
+ }
+
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
if (port)
kill_traffic(port);
}
- if (serial->type->suspend)
- r = serial->type->suspend(serial, message);
-
+err_out:
return r;
}
EXPORT_SYMBOL(usb_serial_suspend);
.chars_in_buffer = serial_chars_in_buffer,
.tiocmget = serial_tiocmget,
.tiocmset = serial_tiocmset,
- .shutdown = serial_release,
+ .get_icount = serial_get_icount,
+ .cleanup = serial_cleanup,
.install = serial_install,
.proc_fops = &serial_proc_fops,
};
set_to_generic_if_null(device, write_bulk_callback);
set_to_generic_if_null(device, disconnect);
set_to_generic_if_null(device, release);
+ set_to_generic_if_null(device, process_read_urb);
+ set_to_generic_if_null(device, prepare_write_buffer);
}
int usb_serial_register(struct usb_serial_driver *driver)
if (!driver->description)
driver->description = driver->driver.name;
+ if (!driver->usb_driver) {
+ WARN(1, "Serial driver %s has no usb_driver\n",
+ driver->description);
+ return -EINVAL;
+ }
+ driver->usb_driver->supports_autosuspend = 1;
/* Add this device to our list of devices */
+ mutex_lock(&table_lock);
list_add(&driver->driver_list, &usb_serial_driver_list);
retval = usb_serial_bus_register(driver);
printk(KERN_INFO "USB Serial support registered for %s\n",
driver->description);
+ mutex_unlock(&table_lock);
return retval;
}
EXPORT_SYMBOL_GPL(usb_serial_register);
/* must be called with BKL held */
printk(KERN_INFO "USB Serial deregistering driver %s\n",
device->description);
+ mutex_lock(&table_lock);
list_del(&device->driver_list);
usb_serial_bus_deregister(device);
+ mutex_unlock(&table_lock);
}
EXPORT_SYMBOL_GPL(usb_serial_deregister);