diff options
Diffstat (limited to 'drivers/usb/serial/usb-serial.c')
| -rw-r--r-- | drivers/usb/serial/usb-serial.c | 121 |
1 files changed, 79 insertions, 42 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 97355a15bbe..27483f91a4a 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -1,7 +1,7 @@ /* * USB Serial Converter driver * - * Copyright (C) 1999 - 2005 Greg Kroah-Hartman (greg@kroah.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) * @@ -43,17 +43,6 @@ #define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com, http://www.kroah.com/linux/" #define DRIVER_DESC "USB Serial Driver core" -/* 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, -}; - /* 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 @@ -670,12 +659,14 @@ exit: static struct usb_serial_driver *search_serial_device( struct usb_interface *iface) { - const struct usb_device_id *id; + 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) { - id = get_iface_id(drv, iface); + if (drv->usb_driver == driver) + id = get_iface_id(drv, iface); if (id) return drv; } @@ -710,7 +701,7 @@ static const struct tty_port_operations serial_port_ops = { .shutdown = serial_down, }; -int usb_serial_probe(struct usb_interface *interface, +static int usb_serial_probe(struct usb_interface *interface, const struct usb_device_id *id) { struct usb_device *dev = interface_to_usbdev(interface); @@ -766,7 +757,7 @@ int usb_serial_probe(struct usb_interface *interface, if (retval) { dbg("sub driver rejected device"); - kfree(serial); + usb_serial_put(serial); module_put(type->driver.owner); return retval; } @@ -838,7 +829,7 @@ int usb_serial_probe(struct usb_interface *interface, */ if (num_bulk_in == 0 || num_bulk_out == 0) { dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n"); - kfree(serial); + usb_serial_put(serial); module_put(type->driver.owner); return -ENODEV; } @@ -852,10 +843,12 @@ int usb_serial_probe(struct usb_interface *interface, if (num_ports == 0) { dev_err(&interface->dev, "Generic device with no bulk out, not allowed.\n"); - kfree(serial); + usb_serial_put(serial); module_put(type->driver.owner); return -EIO; } + dev_info(&interface->dev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n"); + dev_info(&interface->dev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n"); } #endif if (!num_ports) { @@ -1043,6 +1036,8 @@ int usb_serial_probe(struct usb_interface *interface, dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined"); } + usb_set_intfdata(interface, serial); + /* if this device type has an attach function, call it */ if (type->attach) { retval = type->attach(serial); @@ -1087,10 +1082,7 @@ int usb_serial_probe(struct usb_interface *interface, serial->disconnected = 0; usb_serial_console_init(debug, minor); - exit: - /* success */ - usb_set_intfdata(interface, serial); module_put(type->driver.owner); return 0; @@ -1099,9 +1091,8 @@ probe_error: module_put(type->driver.owner); return -EIO; } -EXPORT_SYMBOL_GPL(usb_serial_probe); -void usb_serial_disconnect(struct usb_interface *interface) +static void usb_serial_disconnect(struct usb_interface *interface) { int i; struct usb_serial *serial = usb_get_intfdata(interface); @@ -1112,7 +1103,6 @@ void usb_serial_disconnect(struct usb_interface *interface) dbg("%s", __func__); mutex_lock(&serial->disc_mutex); - usb_set_intfdata(interface, NULL); /* must set a flag, to signal subdrivers */ serial->disconnected = 1; mutex_unlock(&serial->disc_mutex); @@ -1137,7 +1127,6 @@ void usb_serial_disconnect(struct usb_interface *interface) usb_serial_put(serial); dev_info(dev, "device disconnected\n"); } -EXPORT_SYMBOL_GPL(usb_serial_disconnect); int usb_serial_suspend(struct usb_interface *intf, pm_message_t message) { @@ -1181,6 +1170,22 @@ int usb_serial_resume(struct usb_interface *intf) } 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, @@ -1204,6 +1209,17 @@ static const struct tty_operations serial_ops = { 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; @@ -1338,7 +1354,6 @@ static int usb_serial_register(struct usb_serial_driver *driver) driver->description); return -EINVAL; } - driver->usb_driver->supports_autosuspend = 1; /* Add this device to our list of devices */ mutex_lock(&table_lock); @@ -1369,18 +1384,19 @@ static void usb_serial_deregister(struct usb_serial_driver *device) /** * usb_serial_register_drivers - register drivers for a usb-serial module - * @udriver: usb_driver used for matching devices/interfaces * @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 @udriver and all the drivers in the @serial_drivers array. - * Automatically fills in the .no_dynamic_id field in @udriver and - * the .usb_driver field in each serial driver. + * 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_driver *udriver, - struct usb_serial_driver * const serial_drivers[]) +int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[], + const char *name, + const struct usb_device_id *id_table) { int rc; - const struct usb_device_id *saved_id_table; + struct usb_driver *udriver; struct usb_serial_driver * const *sd; /* @@ -1391,12 +1407,30 @@ int usb_serial_register_drivers(struct usb_driver *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. - * Therefore save off udriver's id_table until we are all set. + * 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. */ - saved_id_table = udriver->id_table; - udriver->id_table = NULL; + 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; @@ -1408,8 +1442,8 @@ int usb_serial_register_drivers(struct usb_driver *udriver, goto failed; } - /* Now restore udriver's id_table and look for matches */ - udriver->id_table = saved_id_table; + /* Now set udriver's id_table and look for matches */ + udriver->id_table = id_table; rc = driver_attach(&udriver->drvwrap.driver); return 0; @@ -1423,17 +1457,20 @@ EXPORT_SYMBOL_GPL(usb_serial_register_drivers); /** * usb_serial_deregister_drivers - deregister drivers for a usb-serial module - * @udriver: usb_driver to unregister * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered * - * Deregisters @udriver and all the drivers in the @serial_drivers array. + * 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_driver *udriver, - struct usb_serial_driver * const serial_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); |