v4.19.13 snapshot.
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
new file mode 100644
index 0000000..f7aaa7f
--- /dev/null
+++ b/drivers/usb/serial/usb-serial.c
@@ -0,0 +1,1425 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USB Serial Converter driver
+ *
+ * Copyright (C) 2009 - 2013 Johan Hovold (jhovold@gmail.com)
+ * Copyright (C) 1999 - 2012 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
+ * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com)
+ *
+ * This driver was originally based on the ACM driver by Armin Fuerst (which was
+ * based on a driver by Brad Keryan)
+ *
+ * See Documentation/usb/usb-serial.txt for more information on using this
+ * driver
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/seq_file.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/uaccess.h>
+#include <linux/serial.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include <linux/kfifo.h>
+#include <linux/idr.h>
+
+#define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
+#define DRIVER_DESC "USB Serial Driver core"
+
+#define USB_SERIAL_TTY_MAJOR 188
+#define USB_SERIAL_TTY_MINORS 512 /* should be enough for a while */
+
+/* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead
+ the MODULE_DEVICE_TABLE declarations in each serial driver
+ cause the "hotplug" program to pull in whatever module is necessary
+ via modprobe, and modprobe will load usbserial because the serial
+ drivers depend on it.
+*/
+
+static DEFINE_IDR(serial_minors);
+static DEFINE_MUTEX(table_lock);
+static LIST_HEAD(usb_serial_driver_list);
+
+/*
+ * Look up the serial port structure. If it is found and it hasn't been
+ * disconnected, return with the parent usb_serial structure's disc_mutex held
+ * and its refcount incremented. Otherwise return NULL.
+ */
+struct usb_serial_port *usb_serial_port_get_by_minor(unsigned minor)
+{
+ struct usb_serial *serial;
+ struct usb_serial_port *port;
+
+ mutex_lock(&table_lock);
+ port = idr_find(&serial_minors, minor);
+ if (!port)
+ goto exit;
+
+ serial = port->serial;
+ mutex_lock(&serial->disc_mutex);
+ if (serial->disconnected) {
+ mutex_unlock(&serial->disc_mutex);
+ port = NULL;
+ } else {
+ kref_get(&serial->kref);
+ }
+exit:
+ mutex_unlock(&table_lock);
+ return port;
+}
+
+static int allocate_minors(struct usb_serial *serial, int num_ports)
+{
+ struct usb_serial_port *port;
+ unsigned int i, j;
+ int minor;
+
+ dev_dbg(&serial->interface->dev, "%s %d\n", __func__, num_ports);
+
+ mutex_lock(&table_lock);
+ for (i = 0; i < num_ports; ++i) {
+ port = serial->port[i];
+ minor = idr_alloc(&serial_minors, port, 0,
+ USB_SERIAL_TTY_MINORS, GFP_KERNEL);
+ if (minor < 0)
+ goto error;
+ port->minor = minor;
+ port->port_number = i;
+ }
+ serial->minors_reserved = 1;
+ mutex_unlock(&table_lock);
+ return 0;
+error:
+ /* unwind the already allocated minors */
+ for (j = 0; j < i; ++j)
+ idr_remove(&serial_minors, serial->port[j]->minor);
+ mutex_unlock(&table_lock);
+ return minor;
+}
+
+static void release_minors(struct usb_serial *serial)
+{
+ int i;
+
+ mutex_lock(&table_lock);
+ for (i = 0; i < serial->num_ports; ++i)
+ idr_remove(&serial_minors, serial->port[i]->minor);
+ mutex_unlock(&table_lock);
+ serial->minors_reserved = 0;
+}
+
+static void destroy_serial(struct kref *kref)
+{
+ struct usb_serial *serial;
+ struct usb_serial_port *port;
+ int i;
+
+ serial = to_usb_serial(kref);
+
+ /* return the minor range that this device had */
+ if (serial->minors_reserved)
+ release_minors(serial);
+
+ if (serial->attached && serial->type->release)
+ serial->type->release(serial);
+
+ /* Now that nothing is using the ports, they can be freed */
+ for (i = 0; i < serial->num_port_pointers; ++i) {
+ port = serial->port[i];
+ if (port) {
+ port->serial = NULL;
+ put_device(&port->dev);
+ }
+ }
+
+ usb_put_intf(serial->interface);
+ usb_put_dev(serial->dev);
+ kfree(serial);
+}
+
+void usb_serial_put(struct usb_serial *serial)
+{
+ kref_put(&serial->kref, destroy_serial);
+}
+
+/*****************************************************************************
+ * Driver tty interface functions
+ *****************************************************************************/
+
+/**
+ * serial_install - install tty
+ * @driver: the driver (USB in our case)
+ * @tty: the tty being created
+ *
+ * Create the termios objects for this tty. We use the default
+ * USB serial settings but permit them to be overridden by
+ * serial->type->init_termios.
+ *
+ * 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_cleanup().
+ */
+static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+ int idx = tty->index;
+ struct usb_serial *serial;
+ struct usb_serial_port *port;
+ int retval = -ENODEV;
+
+ port = usb_serial_port_get_by_minor(idx);
+ if (!port)
+ return retval;
+
+ serial = port->serial;
+ if (!try_module_get(serial->type->driver.owner))
+ goto error_module_get;
+
+ retval = usb_autopm_get_interface(serial->interface);
+ if (retval)
+ goto error_get_interface;
+
+ retval = tty_standard_install(driver, tty);
+ if (retval)
+ goto error_init_termios;
+
+ mutex_unlock(&serial->disc_mutex);
+
+ /* allow the driver to update the settings */
+ if (serial->type->init_termios)
+ serial->type->init_termios(tty);
+
+ tty->driver_data = port;
+
+ return retval;
+
+ error_init_termios:
+ usb_autopm_put_interface(serial->interface);
+ error_get_interface:
+ module_put(serial->type->driver.owner);
+ error_module_get:
+ usb_serial_put(serial);
+ mutex_unlock(&serial->disc_mutex);
+ return retval;
+}
+
+static int serial_port_activate(struct tty_port *tport, struct tty_struct *tty)
+{
+ struct usb_serial_port *port =
+ container_of(tport, struct usb_serial_port, port);
+ struct usb_serial *serial = port->serial;
+ int retval;
+
+ mutex_lock(&serial->disc_mutex);
+ if (serial->disconnected)
+ retval = -ENODEV;
+ else
+ retval = port->serial->type->open(tty, port);
+ mutex_unlock(&serial->disc_mutex);
+
+ if (retval < 0)
+ retval = usb_translate_errors(retval);
+
+ return retval;
+}
+
+static int serial_open(struct tty_struct *tty, struct file *filp)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ return tty_port_open(&port->port, tty, filp);
+}
+
+/**
+ * serial_port_shutdown - shut down hardware
+ * @tport: tty port to shut down
+ *
+ * Shut down a USB serial port. Serialized against activate by the
+ * tport mutex and kept to matching open/close pairs
+ * of calls by the initialized flag.
+ *
+ * Not called if tty is console.
+ */
+static void serial_port_shutdown(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;
+
+ if (drv->close)
+ drv->close(port);
+}
+
+static void serial_hangup(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ tty_port_hangup(&port->port);
+}
+
+static void serial_close(struct tty_struct *tty, struct file *filp)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ tty_port_close(&port->port, tty, filp);
+}
+
+/**
+ * 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 asynchronously after the last tty kref is dropped.
+ */
+static void serial_cleanup(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct usb_serial *serial;
+ struct module *owner;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ /* The console is magical. Do not hang up the console hardware
+ * or there will be tears.
+ */
+ if (port->port.console)
+ return;
+
+ tty->driver_data = NULL;
+
+ serial = port->serial;
+ owner = serial->type->driver.owner;
+
+ mutex_lock(&serial->disc_mutex);
+ if (!serial->disconnected)
+ usb_autopm_put_interface(serial->interface);
+ mutex_unlock(&serial->disc_mutex);
+
+ usb_serial_put(serial);
+ module_put(owner);
+}
+
+static int serial_write(struct tty_struct *tty, const unsigned char *buf,
+ int count)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ int retval = -ENODEV;
+
+ if (port->serial->dev->state == USB_STATE_NOTATTACHED)
+ goto exit;
+
+ dev_dbg(tty->dev, "%s - %d byte(s)\n", __func__, count);
+
+ retval = port->serial->type->write(tty, port, buf, count);
+ if (retval < 0)
+ retval = usb_translate_errors(retval);
+exit:
+ return retval;
+}
+
+static int serial_write_room(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ 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;
+ struct usb_serial *serial = port->serial;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ if (serial->disconnected)
+ return 0;
+
+ return serial->type->chars_in_buffer(tty);
+}
+
+static void serial_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct usb_serial *serial = port->serial;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ if (!port->serial->type->wait_until_sent)
+ return;
+
+ mutex_lock(&serial->disc_mutex);
+ if (!serial->disconnected)
+ port->serial->type->wait_until_sent(tty, timeout);
+ mutex_unlock(&serial->disc_mutex);
+}
+
+static void serial_throttle(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ if (port->serial->type->throttle)
+ port->serial->type->throttle(tty);
+}
+
+static void serial_unthrottle(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ if (port->serial->type->unthrottle)
+ port->serial->type->unthrottle(tty);
+}
+
+static int serial_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ int retval = -ENOIOCTLCMD;
+
+ dev_dbg(tty->dev, "%s - cmd 0x%04x\n", __func__, cmd);
+
+ switch (cmd) {
+ case TIOCMIWAIT:
+ if (port->serial->type->tiocmiwait)
+ retval = port->serial->type->tiocmiwait(tty, arg);
+ break;
+ default:
+ if (port->serial->type->ioctl)
+ retval = port->serial->type->ioctl(tty, cmd, arg);
+ }
+
+ return retval;
+}
+
+static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ if (port->serial->type->set_termios)
+ port->serial->type->set_termios(tty, port, old);
+ else
+ tty_termios_copy_hw(&tty->termios, old);
+}
+
+static int serial_break(struct tty_struct *tty, int break_state)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ if (port->serial->type->break_ctl)
+ port->serial->type->break_ctl(tty, break_state);
+
+ return 0;
+}
+
+static int serial_proc_show(struct seq_file *m, void *v)
+{
+ struct usb_serial *serial;
+ struct usb_serial_port *port;
+ int i;
+ char tmp[40];
+
+ seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
+ for (i = 0; i < USB_SERIAL_TTY_MINORS; ++i) {
+ port = usb_serial_port_get_by_minor(i);
+ if (port == NULL)
+ continue;
+ serial = port->serial;
+
+ seq_printf(m, "%d:", i);
+ if (serial->type->driver.owner)
+ seq_printf(m, " module:%s",
+ module_name(serial->type->driver.owner));
+ seq_printf(m, " name:\"%s\"",
+ serial->type->description);
+ seq_printf(m, " vendor:%04x product:%04x",
+ le16_to_cpu(serial->dev->descriptor.idVendor),
+ le16_to_cpu(serial->dev->descriptor.idProduct));
+ seq_printf(m, " num_ports:%d", serial->num_ports);
+ seq_printf(m, " port:%d", port->port_number);
+ usb_make_path(serial->dev, tmp, sizeof(tmp));
+ seq_printf(m, " path:%s", tmp);
+
+ seq_putc(m, '\n');
+ usb_serial_put(serial);
+ mutex_unlock(&serial->disc_mutex);
+ }
+ return 0;
+}
+
+static int serial_tiocmget(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ if (port->serial->type->tiocmget)
+ return port->serial->type->tiocmget(tty);
+ return -EINVAL;
+}
+
+static int serial_tiocmset(struct tty_struct *tty,
+ unsigned int set, unsigned int clear)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ if (port->serial->type->tiocmset)
+ 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;
+
+ dev_dbg(tty->dev, "%s\n", __func__);
+
+ if (port->serial->type->get_icount)
+ return port->serial->type->get_icount(tty, icount);
+ return -EINVAL;
+}
+
+/*
+ * We would be calling tty_wakeup here, but unfortunately some line
+ * disciplines have an annoying habit of calling tty->write from
+ * the write wakeup callback (e.g. n_hdlc.c).
+ */
+void usb_serial_port_softint(struct usb_serial_port *port)
+{
+ schedule_work(&port->work);
+}
+EXPORT_SYMBOL_GPL(usb_serial_port_softint);
+
+static void usb_serial_port_work(struct work_struct *work)
+{
+ struct usb_serial_port *port =
+ container_of(work, struct usb_serial_port, work);
+
+ tty_port_tty_wakeup(&port->port);
+}
+
+static void usb_serial_port_poison_urbs(struct usb_serial_port *port)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
+ usb_poison_urb(port->read_urbs[i]);
+ for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
+ usb_poison_urb(port->write_urbs[i]);
+
+ usb_poison_urb(port->interrupt_in_urb);
+ usb_poison_urb(port->interrupt_out_urb);
+}
+
+static void usb_serial_port_unpoison_urbs(struct usb_serial_port *port)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
+ usb_unpoison_urb(port->read_urbs[i]);
+ for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
+ usb_unpoison_urb(port->write_urbs[i]);
+
+ usb_unpoison_urb(port->interrupt_in_urb);
+ usb_unpoison_urb(port->interrupt_out_urb);
+}
+
+static void usb_serial_port_release(struct device *dev)
+{
+ struct usb_serial_port *port = to_usb_serial_port(dev);
+ int i;
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ usb_free_urb(port->interrupt_in_urb);
+ usb_free_urb(port->interrupt_out_urb);
+ for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
+ usb_free_urb(port->read_urbs[i]);
+ kfree(port->bulk_in_buffers[i]);
+ }
+ 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->interrupt_in_buffer);
+ kfree(port->interrupt_out_buffer);
+ tty_port_destroy(&port->port);
+ kfree(port);
+}
+
+static struct usb_serial *create_serial(struct usb_device *dev,
+ struct usb_interface *interface,
+ struct usb_serial_driver *driver)
+{
+ struct usb_serial *serial;
+
+ serial = kzalloc(sizeof(*serial), GFP_KERNEL);
+ if (!serial)
+ return NULL;
+ serial->dev = usb_get_dev(dev);
+ serial->type = driver;
+ serial->interface = usb_get_intf(interface);
+ kref_init(&serial->kref);
+ mutex_init(&serial->disc_mutex);
+ serial->minors_reserved = 0;
+
+ return serial;
+}
+
+static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
+ struct usb_serial_driver *drv)
+{
+ struct usb_dynid *dynid;
+
+ spin_lock(&drv->dynids.lock);
+ list_for_each_entry(dynid, &drv->dynids.list, node) {
+ if (usb_match_one_id(intf, &dynid->id)) {
+ spin_unlock(&drv->dynids.lock);
+ return &dynid->id;
+ }
+ }
+ spin_unlock(&drv->dynids.lock);
+ return NULL;
+}
+
+static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
+ struct usb_interface *intf)
+{
+ const struct usb_device_id *id;
+
+ id = usb_match_id(intf, drv->id_table);
+ if (id) {
+ dev_dbg(&intf->dev, "static descriptor matches\n");
+ goto exit;
+ }
+ id = match_dynamic_id(intf, drv);
+ if (id)
+ dev_dbg(&intf->dev, "dynamic descriptor matches\n");
+exit:
+ return id;
+}
+
+/* Caller must hold table_lock */
+static struct usb_serial_driver *search_serial_device(
+ struct usb_interface *iface)
+{
+ const struct usb_device_id *id = NULL;
+ struct usb_serial_driver *drv;
+ struct usb_driver *driver = to_usb_driver(iface->dev.driver);
+
+ /* Check if the usb id matches a known device */
+ list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
+ if (drv->usb_driver == driver)
+ id = get_iface_id(drv, iface);
+ if (id)
+ return drv;
+ }
+
+ return NULL;
+}
+
+static int serial_port_carrier_raised(struct tty_port *port)
+{
+ struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
+ struct usb_serial_driver *drv = p->serial->type;
+
+ if (drv->carrier_raised)
+ return drv->carrier_raised(p);
+ /* No carrier control - don't block */
+ return 1;
+}
+
+static void serial_port_dtr_rts(struct tty_port *port, int on)
+{
+ struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
+ struct usb_serial_driver *drv = p->serial->type;
+
+ if (drv->dtr_rts)
+ drv->dtr_rts(p, on);
+}
+
+static ssize_t port_number_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_serial_port *port = to_usb_serial_port(dev);
+
+ return sprintf(buf, "%u\n", port->port_number);
+}
+static DEVICE_ATTR_RO(port_number);
+
+static struct attribute *usb_serial_port_attrs[] = {
+ &dev_attr_port_number.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(usb_serial_port);
+
+static const struct tty_port_operations serial_port_ops = {
+ .carrier_raised = serial_port_carrier_raised,
+ .dtr_rts = serial_port_dtr_rts,
+ .activate = serial_port_activate,
+ .shutdown = serial_port_shutdown,
+};
+
+static void find_endpoints(struct usb_serial *serial,
+ struct usb_serial_endpoints *epds)
+{
+ struct device *dev = &serial->interface->dev;
+ struct usb_host_interface *iface_desc;
+ struct usb_endpoint_descriptor *epd;
+ unsigned int i;
+
+ BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_in) < USB_MAXENDPOINTS / 2);
+ BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_out) < USB_MAXENDPOINTS / 2);
+ BUILD_BUG_ON(ARRAY_SIZE(epds->interrupt_in) < USB_MAXENDPOINTS / 2);
+ BUILD_BUG_ON(ARRAY_SIZE(epds->interrupt_out) < USB_MAXENDPOINTS / 2);
+
+ iface_desc = serial->interface->cur_altsetting;
+ for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+ epd = &iface_desc->endpoint[i].desc;
+
+ if (usb_endpoint_is_bulk_in(epd)) {
+ dev_dbg(dev, "found bulk in on endpoint %u\n", i);
+ epds->bulk_in[epds->num_bulk_in++] = epd;
+ } else if (usb_endpoint_is_bulk_out(epd)) {
+ dev_dbg(dev, "found bulk out on endpoint %u\n", i);
+ epds->bulk_out[epds->num_bulk_out++] = epd;
+ } else if (usb_endpoint_is_int_in(epd)) {
+ dev_dbg(dev, "found interrupt in on endpoint %u\n", i);
+ epds->interrupt_in[epds->num_interrupt_in++] = epd;
+ } else if (usb_endpoint_is_int_out(epd)) {
+ dev_dbg(dev, "found interrupt out on endpoint %u\n", i);
+ epds->interrupt_out[epds->num_interrupt_out++] = epd;
+ }
+ }
+}
+
+static int setup_port_bulk_in(struct usb_serial_port *port,
+ struct usb_endpoint_descriptor *epd)
+{
+ struct usb_serial_driver *type = port->serial->type;
+ struct usb_device *udev = port->serial->dev;
+ int buffer_size;
+ int i;
+
+ buffer_size = max_t(int, type->bulk_in_size, usb_endpoint_maxp(epd));
+ port->bulk_in_size = buffer_size;
+ port->bulk_in_endpointAddress = epd->bEndpointAddress;
+
+ for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
+ set_bit(i, &port->read_urbs_free);
+ port->read_urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
+ if (!port->read_urbs[i])
+ return -ENOMEM;
+ port->bulk_in_buffers[i] = kmalloc(buffer_size, GFP_KERNEL);
+ if (!port->bulk_in_buffers[i])
+ return -ENOMEM;
+ usb_fill_bulk_urb(port->read_urbs[i], udev,
+ usb_rcvbulkpipe(udev, epd->bEndpointAddress),
+ port->bulk_in_buffers[i], buffer_size,
+ type->read_bulk_callback, port);
+ }
+
+ port->read_urb = port->read_urbs[0];
+ port->bulk_in_buffer = port->bulk_in_buffers[0];
+
+ return 0;
+}
+
+static int setup_port_bulk_out(struct usb_serial_port *port,
+ struct usb_endpoint_descriptor *epd)
+{
+ struct usb_serial_driver *type = port->serial->type;
+ struct usb_device *udev = port->serial->dev;
+ int buffer_size;
+ int i;
+
+ if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
+ return -ENOMEM;
+ if (type->bulk_out_size)
+ buffer_size = type->bulk_out_size;
+ else
+ buffer_size = usb_endpoint_maxp(epd);
+ port->bulk_out_size = buffer_size;
+ port->bulk_out_endpointAddress = epd->bEndpointAddress;
+
+ for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
+ set_bit(i, &port->write_urbs_free);
+ port->write_urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
+ if (!port->write_urbs[i])
+ return -ENOMEM;
+ port->bulk_out_buffers[i] = kmalloc(buffer_size, GFP_KERNEL);
+ if (!port->bulk_out_buffers[i])
+ return -ENOMEM;
+ usb_fill_bulk_urb(port->write_urbs[i], udev,
+ usb_sndbulkpipe(udev, epd->bEndpointAddress),
+ port->bulk_out_buffers[i], buffer_size,
+ type->write_bulk_callback, port);
+ }
+
+ port->write_urb = port->write_urbs[0];
+ port->bulk_out_buffer = port->bulk_out_buffers[0];
+
+ return 0;
+}
+
+static int setup_port_interrupt_in(struct usb_serial_port *port,
+ struct usb_endpoint_descriptor *epd)
+{
+ struct usb_serial_driver *type = port->serial->type;
+ struct usb_device *udev = port->serial->dev;
+ int buffer_size;
+
+ port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!port->interrupt_in_urb)
+ return -ENOMEM;
+ buffer_size = usb_endpoint_maxp(epd);
+ port->interrupt_in_endpointAddress = epd->bEndpointAddress;
+ port->interrupt_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
+ if (!port->interrupt_in_buffer)
+ return -ENOMEM;
+ usb_fill_int_urb(port->interrupt_in_urb, udev,
+ usb_rcvintpipe(udev, epd->bEndpointAddress),
+ port->interrupt_in_buffer, buffer_size,
+ type->read_int_callback, port,
+ epd->bInterval);
+
+ return 0;
+}
+
+static int setup_port_interrupt_out(struct usb_serial_port *port,
+ struct usb_endpoint_descriptor *epd)
+{
+ struct usb_serial_driver *type = port->serial->type;
+ struct usb_device *udev = port->serial->dev;
+ int buffer_size;
+
+ port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!port->interrupt_out_urb)
+ return -ENOMEM;
+ buffer_size = usb_endpoint_maxp(epd);
+ port->interrupt_out_size = buffer_size;
+ port->interrupt_out_endpointAddress = epd->bEndpointAddress;
+ port->interrupt_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
+ if (!port->interrupt_out_buffer)
+ return -ENOMEM;
+ usb_fill_int_urb(port->interrupt_out_urb, udev,
+ usb_sndintpipe(udev, epd->bEndpointAddress),
+ port->interrupt_out_buffer, buffer_size,
+ type->write_int_callback, port,
+ epd->bInterval);
+
+ return 0;
+}
+
+static int usb_serial_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct device *ddev = &interface->dev;
+ struct usb_device *dev = interface_to_usbdev(interface);
+ struct usb_serial *serial = NULL;
+ struct usb_serial_port *port;
+ struct usb_serial_endpoints *epds;
+ struct usb_serial_driver *type = NULL;
+ int retval;
+ int i;
+ int num_ports = 0;
+ unsigned char max_endpoints;
+
+ mutex_lock(&table_lock);
+ type = search_serial_device(interface);
+ if (!type) {
+ mutex_unlock(&table_lock);
+ dev_dbg(ddev, "none matched\n");
+ return -ENODEV;
+ }
+
+ if (!try_module_get(type->driver.owner)) {
+ mutex_unlock(&table_lock);
+ dev_err(ddev, "module get failed, exiting\n");
+ return -EIO;
+ }
+ mutex_unlock(&table_lock);
+
+ serial = create_serial(dev, interface, type);
+ if (!serial) {
+ retval = -ENOMEM;
+ goto err_put_module;
+ }
+
+ /* if this device type has a probe function, call it */
+ if (type->probe) {
+ const struct usb_device_id *id;
+
+ id = get_iface_id(type, interface);
+ retval = type->probe(serial, id);
+
+ if (retval) {
+ dev_dbg(ddev, "sub driver rejected device\n");
+ goto err_put_serial;
+ }
+ }
+
+ /* descriptor matches, let's find the endpoints needed */
+ epds = kzalloc(sizeof(*epds), GFP_KERNEL);
+ if (!epds) {
+ retval = -ENOMEM;
+ goto err_put_serial;
+ }
+
+ find_endpoints(serial, epds);
+
+ if (epds->num_bulk_in < type->num_bulk_in ||
+ epds->num_bulk_out < type->num_bulk_out ||
+ epds->num_interrupt_in < type->num_interrupt_in ||
+ epds->num_interrupt_out < type->num_interrupt_out) {
+ dev_err(ddev, "required endpoints missing\n");
+ retval = -ENODEV;
+ goto err_free_epds;
+ }
+
+ if (type->calc_num_ports) {
+ retval = type->calc_num_ports(serial, epds);
+ if (retval < 0)
+ goto err_free_epds;
+ num_ports = retval;
+ }
+
+ if (!num_ports)
+ num_ports = type->num_ports;
+
+ if (num_ports > MAX_NUM_PORTS) {
+ dev_warn(ddev, "too many ports requested: %d\n", num_ports);
+ num_ports = MAX_NUM_PORTS;
+ }
+
+ serial->num_ports = (unsigned char)num_ports;
+ serial->num_bulk_in = epds->num_bulk_in;
+ serial->num_bulk_out = epds->num_bulk_out;
+ serial->num_interrupt_in = epds->num_interrupt_in;
+ serial->num_interrupt_out = epds->num_interrupt_out;
+
+ /* found all that we need */
+ dev_info(ddev, "%s converter detected\n", type->description);
+
+ /* create our ports, we need as many as the max endpoints */
+ /* we don't use num_ports here because some devices have more
+ endpoint pairs than ports */
+ max_endpoints = max(epds->num_bulk_in, epds->num_bulk_out);
+ max_endpoints = max(max_endpoints, epds->num_interrupt_in);
+ max_endpoints = max(max_endpoints, epds->num_interrupt_out);
+ max_endpoints = max(max_endpoints, serial->num_ports);
+ serial->num_port_pointers = max_endpoints;
+
+ dev_dbg(ddev, "setting up %d port structure(s)\n", max_endpoints);
+ for (i = 0; i < max_endpoints; ++i) {
+ port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
+ if (!port) {
+ retval = -ENOMEM;
+ goto err_free_epds;
+ }
+ tty_port_init(&port->port);
+ port->port.ops = &serial_port_ops;
+ port->serial = serial;
+ spin_lock_init(&port->lock);
+ /* 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;
+ port->dev.driver = NULL;
+ port->dev.bus = &usb_serial_bus_type;
+ port->dev.release = &usb_serial_port_release;
+ port->dev.groups = usb_serial_port_groups;
+ device_initialize(&port->dev);
+ }
+
+ /* set up the endpoint information */
+ for (i = 0; i < epds->num_bulk_in; ++i) {
+ retval = setup_port_bulk_in(serial->port[i], epds->bulk_in[i]);
+ if (retval)
+ goto err_free_epds;
+ }
+
+ for (i = 0; i < epds->num_bulk_out; ++i) {
+ retval = setup_port_bulk_out(serial->port[i],
+ epds->bulk_out[i]);
+ if (retval)
+ goto err_free_epds;
+ }
+
+ if (serial->type->read_int_callback) {
+ for (i = 0; i < epds->num_interrupt_in; ++i) {
+ retval = setup_port_interrupt_in(serial->port[i],
+ epds->interrupt_in[i]);
+ if (retval)
+ goto err_free_epds;
+ }
+ } else if (epds->num_interrupt_in) {
+ dev_dbg(ddev, "The device claims to support interrupt in transfers, but read_int_callback is not defined\n");
+ }
+
+ if (serial->type->write_int_callback) {
+ for (i = 0; i < epds->num_interrupt_out; ++i) {
+ retval = setup_port_interrupt_out(serial->port[i],
+ epds->interrupt_out[i]);
+ if (retval)
+ goto err_free_epds;
+ }
+ } else if (epds->num_interrupt_out) {
+ dev_dbg(ddev, "The device claims to support interrupt out transfers, but write_int_callback is not defined\n");
+ }
+
+ usb_set_intfdata(interface, serial);
+
+ /* if this device type has an attach function, call it */
+ if (type->attach) {
+ retval = type->attach(serial);
+ if (retval < 0)
+ goto err_free_epds;
+ 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;
+ }
+
+ retval = allocate_minors(serial, num_ports);
+ if (retval) {
+ dev_err(ddev, "No more free serial minor numbers\n");
+ goto err_free_epds;
+ }
+
+ /* register all of the individual ports with the driver core */
+ for (i = 0; i < num_ports; ++i) {
+ port = serial->port[i];
+ dev_set_name(&port->dev, "ttyUSB%d", port->minor);
+ dev_dbg(ddev, "registering %s\n", dev_name(&port->dev));
+ device_enable_async_suspend(&port->dev);
+
+ retval = device_add(&port->dev);
+ if (retval)
+ dev_err(ddev, "Error registering port device, continuing\n");
+ }
+
+ if (num_ports > 0)
+ usb_serial_console_init(serial->port[0]->minor);
+exit:
+ kfree(epds);
+ module_put(type->driver.owner);
+ return 0;
+
+err_free_epds:
+ kfree(epds);
+err_put_serial:
+ usb_serial_put(serial);
+err_put_module:
+ module_put(type->driver.owner);
+
+ return retval;
+}
+
+static void usb_serial_disconnect(struct usb_interface *interface)
+{
+ int i;
+ struct usb_serial *serial = usb_get_intfdata(interface);
+ struct device *dev = &interface->dev;
+ struct usb_serial_port *port;
+ struct tty_struct *tty;
+
+ usb_serial_console_disconnect(serial);
+
+ mutex_lock(&serial->disc_mutex);
+ /* must set a flag, to signal subdrivers */
+ serial->disconnected = 1;
+ mutex_unlock(&serial->disc_mutex);
+
+ for (i = 0; i < serial->num_ports; ++i) {
+ port = serial->port[i];
+ tty = tty_port_tty_get(&port->port);
+ if (tty) {
+ tty_vhangup(tty);
+ tty_kref_put(tty);
+ }
+ usb_serial_port_poison_urbs(port);
+ wake_up_interruptible(&port->port.delta_msr_wait);
+ cancel_work_sync(&port->work);
+ if (device_is_registered(&port->dev))
+ device_del(&port->dev);
+ }
+ if (serial->type->disconnect)
+ serial->type->disconnect(serial);
+
+ /* let the last holder of this object cause it to be cleaned up */
+ usb_serial_put(serial);
+ dev_info(dev, "device disconnected\n");
+}
+
+int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
+{
+ struct usb_serial *serial = usb_get_intfdata(intf);
+ int i, r = 0;
+
+ serial->suspending = 1;
+
+ /*
+ * serial->type->suspend() MUST return 0 in system sleep context,
+ * otherwise, the resume callback has to recover device from
+ * previous suspend failure.
+ */
+ 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)
+ usb_serial_port_poison_urbs(serial->port[i]);
+err_out:
+ return r;
+}
+EXPORT_SYMBOL(usb_serial_suspend);
+
+static void usb_serial_unpoison_port_urbs(struct usb_serial *serial)
+{
+ int i;
+
+ for (i = 0; i < serial->num_ports; ++i)
+ usb_serial_port_unpoison_urbs(serial->port[i]);
+}
+
+int usb_serial_resume(struct usb_interface *intf)
+{
+ struct usb_serial *serial = usb_get_intfdata(intf);
+ int rv;
+
+ usb_serial_unpoison_port_urbs(serial);
+
+ serial->suspending = 0;
+ if (serial->type->resume)
+ rv = serial->type->resume(serial);
+ else
+ rv = usb_serial_generic_resume(serial);
+
+ return rv;
+}
+EXPORT_SYMBOL(usb_serial_resume);
+
+static int usb_serial_reset_resume(struct usb_interface *intf)
+{
+ struct usb_serial *serial = usb_get_intfdata(intf);
+ int rv;
+
+ usb_serial_unpoison_port_urbs(serial);
+
+ serial->suspending = 0;
+ if (serial->type->reset_resume) {
+ rv = serial->type->reset_resume(serial);
+ } else {
+ rv = -EOPNOTSUPP;
+ intf->needs_binding = 1;
+ }
+
+ return rv;
+}
+
+static const struct tty_operations serial_ops = {
+ .open = serial_open,
+ .close = serial_close,
+ .write = serial_write,
+ .hangup = serial_hangup,
+ .write_room = serial_write_room,
+ .ioctl = serial_ioctl,
+ .set_termios = serial_set_termios,
+ .throttle = serial_throttle,
+ .unthrottle = serial_unthrottle,
+ .break_ctl = serial_break,
+ .chars_in_buffer = serial_chars_in_buffer,
+ .wait_until_sent = serial_wait_until_sent,
+ .tiocmget = serial_tiocmget,
+ .tiocmset = serial_tiocmset,
+ .get_icount = serial_get_icount,
+ .cleanup = serial_cleanup,
+ .install = serial_install,
+ .proc_show = serial_proc_show,
+};
+
+
+struct tty_driver *usb_serial_tty_driver;
+
+static int __init usb_serial_init(void)
+{
+ int result;
+
+ usb_serial_tty_driver = alloc_tty_driver(USB_SERIAL_TTY_MINORS);
+ if (!usb_serial_tty_driver)
+ return -ENOMEM;
+
+ /* Initialize our global data */
+ result = bus_register(&usb_serial_bus_type);
+ if (result) {
+ pr_err("%s - registering bus driver failed\n", __func__);
+ goto exit_bus;
+ }
+
+ usb_serial_tty_driver->driver_name = "usbserial";
+ usb_serial_tty_driver->name = "ttyUSB";
+ usb_serial_tty_driver->major = USB_SERIAL_TTY_MAJOR;
+ usb_serial_tty_driver->minor_start = 0;
+ usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+ usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
+ usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
+ TTY_DRIVER_DYNAMIC_DEV;
+ usb_serial_tty_driver->init_termios = tty_std_termios;
+ usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
+ | HUPCL | CLOCAL;
+ usb_serial_tty_driver->init_termios.c_ispeed = 9600;
+ usb_serial_tty_driver->init_termios.c_ospeed = 9600;
+ tty_set_operations(usb_serial_tty_driver, &serial_ops);
+ result = tty_register_driver(usb_serial_tty_driver);
+ if (result) {
+ pr_err("%s - tty_register_driver failed\n", __func__);
+ goto exit_reg_driver;
+ }
+
+ /* register the generic driver, if we should */
+ result = usb_serial_generic_register();
+ if (result < 0) {
+ pr_err("%s - registering generic driver failed\n", __func__);
+ goto exit_generic;
+ }
+
+ return result;
+
+exit_generic:
+ tty_unregister_driver(usb_serial_tty_driver);
+
+exit_reg_driver:
+ bus_unregister(&usb_serial_bus_type);
+
+exit_bus:
+ pr_err("%s - returning with error %d\n", __func__, result);
+ put_tty_driver(usb_serial_tty_driver);
+ return result;
+}
+
+
+static void __exit usb_serial_exit(void)
+{
+ usb_serial_console_exit();
+
+ usb_serial_generic_deregister();
+
+ tty_unregister_driver(usb_serial_tty_driver);
+ put_tty_driver(usb_serial_tty_driver);
+ bus_unregister(&usb_serial_bus_type);
+ idr_destroy(&serial_minors);
+}
+
+
+module_init(usb_serial_init);
+module_exit(usb_serial_exit);
+
+#define set_to_generic_if_null(type, function) \
+ do { \
+ if (!type->function) { \
+ type->function = usb_serial_generic_##function; \
+ pr_debug("%s: using generic " #function "\n", \
+ type->driver.name); \
+ } \
+ } while (0)
+
+static void usb_serial_operations_init(struct usb_serial_driver *device)
+{
+ set_to_generic_if_null(device, open);
+ set_to_generic_if_null(device, write);
+ set_to_generic_if_null(device, close);
+ set_to_generic_if_null(device, write_room);
+ set_to_generic_if_null(device, chars_in_buffer);
+ if (device->tx_empty)
+ set_to_generic_if_null(device, wait_until_sent);
+ set_to_generic_if_null(device, read_bulk_callback);
+ set_to_generic_if_null(device, write_bulk_callback);
+ set_to_generic_if_null(device, process_read_urb);
+ set_to_generic_if_null(device, prepare_write_buffer);
+}
+
+static int usb_serial_register(struct usb_serial_driver *driver)
+{
+ int retval;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ 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;
+ }
+
+ usb_serial_operations_init(driver);
+
+ /* 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);
+ if (retval) {
+ pr_err("problem %d when registering driver %s\n", retval, driver->description);
+ list_del(&driver->driver_list);
+ } else {
+ pr_info("USB Serial support registered for %s\n", driver->description);
+ }
+ mutex_unlock(&table_lock);
+ return retval;
+}
+
+static void usb_serial_deregister(struct usb_serial_driver *device)
+{
+ pr_info("USB Serial deregistering driver %s\n", device->description);
+
+ mutex_lock(&table_lock);
+ list_del(&device->driver_list);
+ mutex_unlock(&table_lock);
+
+ usb_serial_bus_deregister(device);
+}
+
+/**
+ * usb_serial_register_drivers - register drivers for a usb-serial module
+ * @serial_drivers: NULL-terminated array of pointers to drivers to be registered
+ * @name: name of the usb_driver for this set of @serial_drivers
+ * @id_table: list of all devices this @serial_drivers set binds to
+ *
+ * Registers all the drivers in the @serial_drivers array, and dynamically
+ * creates a struct usb_driver with the name @name and id_table of @id_table.
+ */
+int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
+ const char *name,
+ const struct usb_device_id *id_table)
+{
+ int rc;
+ struct usb_driver *udriver;
+ struct usb_serial_driver * const *sd;
+
+ /*
+ * udriver must be registered before any of the serial drivers,
+ * because the store_new_id() routine for the serial drivers (in
+ * bus.c) probes udriver.
+ *
+ * Performance hack: We don't want udriver to be probed until
+ * the serial drivers are registered, because the probe would
+ * simply fail for lack of a matching serial driver.
+ * So we leave udriver's id_table set to NULL until we are all set.
+ *
+ * Suspend/resume support is implemented in the usb-serial core,
+ * so fill in the PM-related fields in udriver.
+ */
+ udriver = kzalloc(sizeof(*udriver), GFP_KERNEL);
+ if (!udriver)
+ return -ENOMEM;
+
+ udriver->name = name;
+ udriver->no_dynamic_id = 1;
+ udriver->supports_autosuspend = 1;
+ udriver->suspend = usb_serial_suspend;
+ udriver->resume = usb_serial_resume;
+ udriver->probe = usb_serial_probe;
+ udriver->disconnect = usb_serial_disconnect;
+
+ /* we only set the reset_resume field if the serial_driver has one */
+ for (sd = serial_drivers; *sd; ++sd) {
+ if ((*sd)->reset_resume) {
+ udriver->reset_resume = usb_serial_reset_resume;
+ break;
+ }
+ }
+
+ rc = usb_register(udriver);
+ if (rc)
+ goto failed_usb_register;
+
+ for (sd = serial_drivers; *sd; ++sd) {
+ (*sd)->usb_driver = udriver;
+ rc = usb_serial_register(*sd);
+ if (rc)
+ goto failed;
+ }
+
+ /* Now set udriver's id_table and look for matches */
+ udriver->id_table = id_table;
+ rc = driver_attach(&udriver->drvwrap.driver);
+ return 0;
+
+ failed:
+ while (sd-- > serial_drivers)
+ usb_serial_deregister(*sd);
+ usb_deregister(udriver);
+failed_usb_register:
+ kfree(udriver);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(usb_serial_register_drivers);
+
+/**
+ * usb_serial_deregister_drivers - deregister drivers for a usb-serial module
+ * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered
+ *
+ * Deregisters all the drivers in the @serial_drivers array and deregisters and
+ * frees the struct usb_driver that was created by the call to
+ * usb_serial_register_drivers().
+ */
+void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_drivers[])
+{
+ struct usb_driver *udriver = (*serial_drivers)->usb_driver;
+
+ for (; *serial_drivers; ++serial_drivers)
+ usb_serial_deregister(*serial_drivers);
+ usb_deregister(udriver);
+ kfree(udriver);
+}
+EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL v2");