| /* |
| * USB Serial Converter driver |
| * |
| * 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 program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License version |
| * 2 as published by the Free Software Foundation. |
| * |
| * 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 "pl2303.h" |
| |
| #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@linuxfoundation.org>" |
| #define DRIVER_DESC "USB Serial Driver core" |
| |
| /* 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. |
| */ |
| |
| /* initially all NULL */ |
| static struct usb_serial *serial_table[SERIAL_TTY_MINORS]; |
| static DEFINE_MUTEX(table_lock); |
| static LIST_HEAD(usb_serial_driver_list); |
| |
| /* |
| * Look up the serial structure. If it is found and it hasn't been |
| * disconnected, return with its disc_mutex held and its refcount |
| * incremented. Otherwise return NULL. |
| */ |
| struct usb_serial *usb_serial_get_by_index(unsigned index) |
| { |
| struct usb_serial *serial; |
| |
| mutex_lock(&table_lock); |
| serial = serial_table[index]; |
| |
| if (serial) { |
| mutex_lock(&serial->disc_mutex); |
| if (serial->disconnected) { |
| mutex_unlock(&serial->disc_mutex); |
| serial = NULL; |
| } else { |
| kref_get(&serial->kref); |
| } |
| } |
| mutex_unlock(&table_lock); |
| return serial; |
| } |
| |
| static struct usb_serial *get_free_serial(struct usb_serial *serial, |
| int num_ports, unsigned int *minor) |
| { |
| unsigned int i, j; |
| int good_spot; |
| |
| dev_dbg(&serial->interface->dev, "%s %d\n", __func__, num_ports); |
| |
| *minor = 0; |
| mutex_lock(&table_lock); |
| for (i = 0; i < SERIAL_TTY_MINORS; ++i) { |
| if (serial_table[i]) |
| continue; |
| |
| good_spot = 1; |
| for (j = 1; j <= num_ports-1; ++j) |
| if ((i+j >= SERIAL_TTY_MINORS) || (serial_table[i+j])) { |
| good_spot = 0; |
| i += j; |
| break; |
| } |
| if (good_spot == 0) |
| continue; |
| |
| *minor = i; |
| j = 0; |
| dev_dbg(&serial->interface->dev, "%s - minor base = %d\n", __func__, *minor); |
| for (i = *minor; (i < (*minor + num_ports)) && (i < SERIAL_TTY_MINORS); ++i) { |
| serial_table[i] = serial; |
| serial->port[j++]->number = i; |
| } |
| mutex_unlock(&table_lock); |
| return serial; |
| } |
| mutex_unlock(&table_lock); |
| return NULL; |
| } |
| |
| static void return_serial(struct usb_serial *serial) |
| { |
| int i; |
| |
| mutex_lock(&table_lock); |
| for (i = 0; i < serial->num_ports; ++i) |
| serial_table[serial->minor + i] = NULL; |
| mutex_unlock(&table_lock); |
| } |
| |
| 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->minor != SERIAL_TTY_NO_MINOR) |
| return_serial(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) { |
| port = serial->port[i]; |
| if (port) { |
| port->serial = NULL; |
| put_device(&port->dev); |
| } |
| } |
| |
| 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; |
| |
| serial = usb_serial_get_by_index(idx); |
| if (!serial) |
| return retval; |
| |
| port = serial->port[idx - serial->minor]; |
| if (!port) |
| goto error_no_port; |
| 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_port_install(&port->port, 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: |
| error_no_port: |
| usb_serial_put(serial); |
| mutex_unlock(&serial->disc_mutex); |
| return retval; |
| } |
| |
| static int serial_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 - port %d\n", __func__, port->number); |
| return tty_port_open(&port->port, tty, filp); |
| } |
| |
| /** |
| * serial_down - 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 ASYNCB_INITIALIZED flag. |
| * |
| * Not called if tty is console. |
| */ |
| 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; |
| |
| 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 - port %d\n", __func__, port->number); |
| 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 - port %d\n", __func__, port->number); |
| 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; |
| |
| /* The console is magical. Do not hang up the console hardware |
| * or there will be tears. |
| */ |
| if (port->port.console) |
| return; |
| |
| dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number); |
| |
| 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 - port %d, %d byte(s)\n", __func__, |
| port->number, count); |
| |
| /* pass on to the driver specific version of this function */ |
| 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 - port %d\n", __func__, port->number); |
| /* 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; |
| struct usb_serial *serial = port->serial; |
| int count = 0; |
| |
| dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number); |
| |
| mutex_lock(&serial->disc_mutex); |
| /* if the device was unplugged then any remaining characters |
| fell out of the connector ;) */ |
| if (serial->disconnected) |
| count = 0; |
| else |
| count = serial->type->chars_in_buffer(tty); |
| mutex_unlock(&serial->disc_mutex); |
| |
| return count; |
| } |
| |
| static void serial_throttle(struct tty_struct *tty) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| |
| dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number); |
| |
| /* pass on to the driver specific version of this function */ |
| 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 - port %d\n", __func__, port->number); |
| |
| /* 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, |
| unsigned int cmd, unsigned long arg) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| int retval = -ENODEV; |
| |
| dev_dbg(tty->dev, "%s - port %d, cmd 0x%.4x\n", __func__, |
| port->number, cmd); |
| |
| /* 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, cmd, arg); |
| } else |
| retval = -ENOIOCTLCMD; |
| 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 - port %d\n", __func__, port->number); |
| |
| /* pass on to the driver specific version of this function |
| if it is available */ |
| 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 - port %d\n", __func__, port->number); |
| |
| /* pass on to the driver specific version of this function |
| if it is available */ |
| 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; |
| int i; |
| char tmp[40]; |
| |
| seq_puts(m, "usbserinfo:1.0 driver:2.0\n"); |
| for (i = 0; i < SERIAL_TTY_MINORS; ++i) { |
| serial = usb_serial_get_by_index(i); |
| if (serial == NULL) |
| continue; |
| |
| 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", i - serial->minor + 1); |
| 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_proc_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, serial_proc_show, NULL); |
| } |
| |
| static const struct file_operations serial_proc_fops = { |
| .owner = THIS_MODULE, |
| .open = serial_proc_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int serial_tiocmget(struct tty_struct *tty) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| |
| dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number); |
| |
| 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 - port %d\n", __func__, port->number); |
| |
| 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 - port %d\n", __func__, port->number); |
| |
| 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); |
| struct tty_struct *tty; |
| |
| tty = tty_port_tty_get(&port->port); |
| if (!tty) |
| return; |
| |
| dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number); |
| |
| tty_wakeup(tty); |
| tty_kref_put(tty); |
| } |
| |
| static void kill_traffic(struct usb_serial_port *port) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) |
| usb_kill_urb(port->read_urbs[i]); |
| 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 |
| * handler for the write_urb or vice versa |
| * this order determines the order in which |
| * usb_kill_urb() must be used to reliably |
| * kill the URBs. As it is unknown here, |
| * both orders must be used in turn. |
| * The call below is not redundant. |
| */ |
| usb_kill_urb(port->read_urb); |
| usb_kill_urb(port->interrupt_in_urb); |
| usb_kill_urb(port->interrupt_out_urb); |
| } |
| |
| static void port_release(struct device *dev) |
| { |
| struct usb_serial_port *port = to_usb_serial_port(dev); |
| int i; |
| |
| dev_dbg(dev, "%s\n", __func__); |
| |
| /* |
| * Stop all the traffic before cancelling the work, so that |
| * nobody will restart it by calling usb_serial_port_softint. |
| */ |
| kill_traffic(port); |
| cancel_work_sync(&port->work); |
| |
| 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) { |
| dev_err(&dev->dev, "%s - out of memory\n", __func__); |
| return NULL; |
| } |
| serial->dev = usb_get_dev(dev); |
| serial->type = driver; |
| serial->interface = interface; |
| kref_init(&serial->kref); |
| mutex_init(&serial->disc_mutex); |
| serial->minor = SERIAL_TTY_NO_MINOR; |
| |
| 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_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_dtr_rts(struct tty_port *port, int on) |
| { |
| struct usb_serial_port *p = container_of(port, struct usb_serial_port, port); |
| struct usb_serial *serial = p->serial; |
| struct usb_serial_driver *drv = serial->type; |
| |
| if (!drv->dtr_rts) |
| return; |
| /* |
| * Work-around bug in the tty-layer which can result in dtr_rts |
| * being called after a disconnect (and tty_unregister_device |
| * has returned). Remove once bug has been squashed. |
| */ |
| mutex_lock(&serial->disc_mutex); |
| if (!serial->disconnected) |
| drv->dtr_rts(p, on); |
| mutex_unlock(&serial->disc_mutex); |
| } |
| |
| 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, |
| }; |
| |
| 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_host_interface *iface_desc; |
| struct usb_endpoint_descriptor *endpoint; |
| struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS]; |
| struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS]; |
| struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS]; |
| struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS]; |
| struct usb_serial_driver *type = NULL; |
| int retval; |
| unsigned int minor; |
| int buffer_size; |
| int i; |
| int j; |
| int num_interrupt_in = 0; |
| int num_interrupt_out = 0; |
| int num_bulk_in = 0; |
| int num_bulk_out = 0; |
| int num_ports = 0; |
| int 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) { |
| module_put(type->driver.owner); |
| dev_err(ddev, "%s - out of memory\n", __func__); |
| return -ENOMEM; |
| } |
| |
| /* 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"); |
| usb_serial_put(serial); |
| module_put(type->driver.owner); |
| return retval; |
| } |
| } |
| |
| /* descriptor matches, let's find the endpoints needed */ |
| /* check out the endpoints */ |
| iface_desc = interface->cur_altsetting; |
| for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { |
| endpoint = &iface_desc->endpoint[i].desc; |
| |
| if (usb_endpoint_is_bulk_in(endpoint)) { |
| /* we found a bulk in endpoint */ |
| dev_dbg(ddev, "found bulk in on endpoint %d\n", i); |
| bulk_in_endpoint[num_bulk_in] = endpoint; |
| ++num_bulk_in; |
| } |
| |
| if (usb_endpoint_is_bulk_out(endpoint)) { |
| /* we found a bulk out endpoint */ |
| dev_dbg(ddev, "found bulk out on endpoint %d\n", i); |
| bulk_out_endpoint[num_bulk_out] = endpoint; |
| ++num_bulk_out; |
| } |
| |
| if (usb_endpoint_is_int_in(endpoint)) { |
| /* we found a interrupt in endpoint */ |
| dev_dbg(ddev, "found interrupt in on endpoint %d\n", i); |
| interrupt_in_endpoint[num_interrupt_in] = endpoint; |
| ++num_interrupt_in; |
| } |
| |
| if (usb_endpoint_is_int_out(endpoint)) { |
| /* we found an interrupt out endpoint */ |
| dev_dbg(ddev, "found interrupt out on endpoint %d\n", i); |
| interrupt_out_endpoint[num_interrupt_out] = endpoint; |
| ++num_interrupt_out; |
| } |
| } |
| |
| #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE) |
| /* BEGIN HORRIBLE HACK FOR PL2303 */ |
| /* this is needed due to the looney way its endpoints are set up */ |
| if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) && |
| (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) || |
| ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) && |
| (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) || |
| ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) && |
| (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) || |
| ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) && |
| (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) { |
| if (interface != dev->actconfig->interface[0]) { |
| /* check out the endpoints of the other interface*/ |
| iface_desc = dev->actconfig->interface[0]->cur_altsetting; |
| for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { |
| endpoint = &iface_desc->endpoint[i].desc; |
| if (usb_endpoint_is_int_in(endpoint)) { |
| /* we found a interrupt in endpoint */ |
| dev_dbg(ddev, "found interrupt in for Prolific device on separate interface\n"); |
| interrupt_in_endpoint[num_interrupt_in] = endpoint; |
| ++num_interrupt_in; |
| } |
| } |
| } |
| |
| /* Now make sure the PL-2303 is configured correctly. |
| * If not, give up now and hope this hack will work |
| * properly during a later invocation of usb_serial_probe |
| */ |
| if (num_bulk_in == 0 || num_bulk_out == 0) { |
| dev_info(ddev, "PL-2303 hack: descriptors matched but endpoints did not\n"); |
| usb_serial_put(serial); |
| module_put(type->driver.owner); |
| return -ENODEV; |
| } |
| } |
| /* END HORRIBLE HACK FOR PL2303 */ |
| #endif |
| |
| #ifdef CONFIG_USB_SERIAL_GENERIC |
| if (type == &usb_serial_generic_device) { |
| num_ports = num_bulk_out; |
| if (num_ports == 0) { |
| dev_err(ddev, "Generic device with no bulk out, not allowed.\n"); |
| usb_serial_put(serial); |
| module_put(type->driver.owner); |
| return -EIO; |
| } |
| dev_info(ddev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n"); |
| dev_info(ddev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n"); |
| } |
| #endif |
| if (!num_ports) { |
| /* if this device type has a calc_num_ports function, call it */ |
| if (type->calc_num_ports) |
| num_ports = type->calc_num_ports(serial); |
| if (!num_ports) |
| num_ports = type->num_ports; |
| } |
| |
| serial->num_ports = num_ports; |
| serial->num_bulk_in = num_bulk_in; |
| serial->num_bulk_out = num_bulk_out; |
| serial->num_interrupt_in = num_interrupt_in; |
| serial->num_interrupt_out = 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(num_bulk_in, num_bulk_out); |
| max_endpoints = max(max_endpoints, num_interrupt_in); |
| max_endpoints = max(max_endpoints, num_interrupt_out); |
| max_endpoints = max(max_endpoints, (int)serial->num_ports); |
| serial->num_port_pointers = max_endpoints; |
| |
| dev_dbg(ddev, "setting up %d port structures for this device", max_endpoints); |
| for (i = 0; i < max_endpoints; ++i) { |
| port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL); |
| if (!port) |
| goto probe_error; |
| 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 = &port_release; |
| device_initialize(&port->dev); |
| } |
| |
| /* set up the endpoint information */ |
| for (i = 0; i < num_bulk_in; ++i) { |
| endpoint = bulk_in_endpoint[i]; |
| port = serial->port[i]; |
| 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; |
| |
| for (j = 0; j < ARRAY_SIZE(port->read_urbs); ++j) { |
| set_bit(j, &port->read_urbs_free); |
| port->read_urbs[j] = usb_alloc_urb(0, GFP_KERNEL); |
| if (!port->read_urbs[j]) { |
| dev_err(ddev, "No free urbs available\n"); |
| goto probe_error; |
| } |
| port->bulk_in_buffers[j] = kmalloc(buffer_size, |
| GFP_KERNEL); |
| if (!port->bulk_in_buffers[j]) { |
| dev_err(ddev, "Couldn't allocate bulk_in_buffer\n"); |
| goto probe_error; |
| } |
| usb_fill_bulk_urb(port->read_urbs[j], dev, |
| usb_rcvbulkpipe(dev, |
| endpoint->bEndpointAddress), |
| port->bulk_in_buffers[j], buffer_size, |
| serial->type->read_bulk_callback, |
| port); |
| } |
| |
| port->read_urb = port->read_urbs[0]; |
| port->bulk_in_buffer = port->bulk_in_buffers[0]; |
| } |
| |
| for (i = 0; i < num_bulk_out; ++i) { |
| endpoint = bulk_out_endpoint[i]; |
| port = serial->port[i]; |
| 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; |
| |
| 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(ddev, "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(ddev, "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); |
| } |
| |
| port->write_urb = port->write_urbs[0]; |
| port->bulk_out_buffer = port->bulk_out_buffers[0]; |
| } |
| |
| if (serial->type->read_int_callback) { |
| for (i = 0; i < num_interrupt_in; ++i) { |
| endpoint = interrupt_in_endpoint[i]; |
| port = serial->port[i]; |
| port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!port->interrupt_in_urb) { |
| dev_err(ddev, "No free urbs available\n"); |
| goto probe_error; |
| } |
| buffer_size = usb_endpoint_maxp(endpoint); |
| port->interrupt_in_endpointAddress = |
| endpoint->bEndpointAddress; |
| port->interrupt_in_buffer = kmalloc(buffer_size, |
| GFP_KERNEL); |
| if (!port->interrupt_in_buffer) { |
| dev_err(ddev, "Couldn't allocate interrupt_in_buffer\n"); |
| goto probe_error; |
| } |
| usb_fill_int_urb(port->interrupt_in_urb, dev, |
| usb_rcvintpipe(dev, |
| endpoint->bEndpointAddress), |
| port->interrupt_in_buffer, buffer_size, |
| serial->type->read_int_callback, port, |
| endpoint->bInterval); |
| } |
| } else if (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 < num_interrupt_out; ++i) { |
| endpoint = interrupt_out_endpoint[i]; |
| port = serial->port[i]; |
| port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!port->interrupt_out_urb) { |
| dev_err(ddev, "No free urbs available\n"); |
| goto probe_error; |
| } |
| buffer_size = usb_endpoint_maxp(endpoint); |
| port->interrupt_out_size = buffer_size; |
| port->interrupt_out_endpointAddress = |
| endpoint->bEndpointAddress; |
| port->interrupt_out_buffer = kmalloc(buffer_size, |
| GFP_KERNEL); |
| if (!port->interrupt_out_buffer) { |
| dev_err(ddev, "Couldn't allocate interrupt_out_buffer\n"); |
| goto probe_error; |
| } |
| usb_fill_int_urb(port->interrupt_out_urb, dev, |
| usb_sndintpipe(dev, |
| endpoint->bEndpointAddress), |
| port->interrupt_out_buffer, buffer_size, |
| serial->type->write_int_callback, port, |
| endpoint->bInterval); |
| } |
| } else if (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 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(ddev, "No more free serial devices\n"); |
| goto probe_error; |
| } |
| serial->minor = minor; |
| |
| /* 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->number); |
| dev_dbg(ddev, "registering %s", 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"); |
| } |
| |
| serial->disconnected = 0; |
| |
| usb_serial_console_init(minor); |
| exit: |
| module_put(type->driver.owner); |
| return 0; |
| |
| probe_error: |
| usb_serial_put(serial); |
| module_put(type->driver.owner); |
| return -EIO; |
| } |
| |
| 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; |
| |
| 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]; |
| if (port) { |
| struct tty_struct *tty = tty_port_tty_get(&port->port); |
| if (tty) { |
| tty_vhangup(tty); |
| tty_kref_put(tty); |
| } |
| kill_traffic(port); |
| cancel_work_sync(&port->work); |
| if (device_is_registered(&port->dev)) |
| device_del(&port->dev); |
| } |
| } |
| 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); |
| struct usb_serial_port *port; |
| int i, r = 0; |
| |
| 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); |
| } |
| |
| err_out: |
| return r; |
| } |
| EXPORT_SYMBOL(usb_serial_suspend); |
| |
| int usb_serial_resume(struct usb_interface *intf) |
| { |
| struct usb_serial *serial = usb_get_intfdata(intf); |
| int rv; |
| |
| 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; |
| |
| 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, |
| .tiocmget = serial_tiocmget, |
| .tiocmset = serial_tiocmset, |
| .get_icount = serial_get_icount, |
| .cleanup = serial_cleanup, |
| .install = serial_install, |
| .proc_fops = &serial_proc_fops, |
| }; |
| |
| |
| struct tty_driver *usb_serial_tty_driver; |
| |
| /* Driver structure we register with the USB core */ |
| static struct usb_driver usb_serial_driver = { |
| .name = "usbserial", |
| .probe = usb_serial_probe, |
| .disconnect = usb_serial_disconnect, |
| .suspend = usb_serial_suspend, |
| .resume = usb_serial_resume, |
| .no_dynamic_id = 1, |
| .supports_autosuspend = 1, |
| }; |
| |
| static int __init usb_serial_init(void) |
| { |
| int i; |
| int result; |
| |
| usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS); |
| if (!usb_serial_tty_driver) |
| return -ENOMEM; |
| |
| /* Initialize our global data */ |
| for (i = 0; i < SERIAL_TTY_MINORS; ++i) |
| serial_table[i] = NULL; |
| |
| 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 = 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 USB driver */ |
| result = usb_register(&usb_serial_driver); |
| if (result < 0) { |
| pr_err("%s - usb_register failed\n", __func__); |
| goto exit_tty; |
| } |
| |
| /* 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: |
| usb_deregister(&usb_serial_driver); |
| |
| exit_tty: |
| 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(); |
| |
| usb_deregister(&usb_serial_driver); |
| tty_unregister_driver(usb_serial_tty_driver); |
| put_tty_driver(usb_serial_tty_driver); |
| bus_unregister(&usb_serial_bus_type); |
| } |
| |
| |
| 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("Had to override the " #function \ |
| " usb serial operation with the generic one.");\ |
| } \ |
| } while (0) |
| |
| static void fixup_generic(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); |
| set_to_generic_if_null(device, read_bulk_callback); |
| 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); |
| } |
| |
| static int usb_serial_register(struct usb_serial_driver *driver) |
| { |
| int retval; |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| fixup_generic(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; |
| } |
| |
| /* 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); |
| usb_serial_bus_deregister(device); |
| mutex_unlock(&table_lock); |
| } |
| |
| /** |
| * 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) |
| return rc; |
| |
| 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); |
| 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 information */ |
| MODULE_AUTHOR(DRIVER_AUTHOR); |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_LICENSE("GPL"); |