2005-04-16 22:20:36 +00:00
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/*
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* USB Serial Converter Generic functions
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*
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* Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/usb.h>
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2006-07-12 04:22:58 +00:00
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#include <linux/usb/serial.h>
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2008-07-22 10:11:55 +00:00
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#include <linux/uaccess.h>
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2005-04-16 22:20:36 +00:00
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2006-12-17 20:50:24 +00:00
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2005-04-16 22:20:36 +00:00
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static int debug;
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#ifdef CONFIG_USB_SERIAL_GENERIC
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2007-03-23 19:51:55 +00:00
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static int generic_probe(struct usb_interface *interface,
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const struct usb_device_id *id);
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2005-04-16 22:20:36 +00:00
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static __u16 vendor = 0x05f9;
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static __u16 product = 0xffff;
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module_param(vendor, ushort, 0);
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MODULE_PARM_DESC(vendor, "User specified USB idVendor");
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module_param(product, ushort, 0);
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MODULE_PARM_DESC(product, "User specified USB idProduct");
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static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */
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2006-12-17 20:50:24 +00:00
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/* we want to look at all devices, as the vendor/product id can change
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* depending on the command line argument */
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static struct usb_device_id generic_serial_ids[] = {
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{.driver_info = 42},
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{}
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};
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static struct usb_driver generic_driver = {
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.name = "usbserial_generic",
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.probe = generic_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = generic_serial_ids,
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.no_dynamic_id = 1,
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};
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2005-04-16 22:20:36 +00:00
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/* All of the device info needed for the Generic Serial Converter */
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2005-06-21 04:15:16 +00:00
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struct usb_serial_driver usb_serial_generic_device = {
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2005-06-21 04:15:16 +00:00
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.driver = {
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.owner = THIS_MODULE,
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2005-06-21 04:15:16 +00:00
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.name = "generic",
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2005-06-21 04:15:16 +00:00
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},
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2005-04-16 22:20:36 +00:00
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.id_table = generic_device_ids,
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2006-12-17 20:50:24 +00:00
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.usb_driver = &generic_driver,
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2005-04-16 22:20:36 +00:00
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.num_ports = 1,
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.shutdown = usb_serial_generic_shutdown,
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2007-02-01 19:08:18 +00:00
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.throttle = usb_serial_generic_throttle,
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.unthrottle = usb_serial_generic_unthrottle,
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2007-04-27 18:54:57 +00:00
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.resume = usb_serial_generic_resume,
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2005-04-16 22:20:36 +00:00
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};
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static int generic_probe(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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const struct usb_device_id *id_pattern;
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id_pattern = usb_match_id(interface, generic_device_ids);
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if (id_pattern != NULL)
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return usb_serial_probe(interface, id);
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return -ENODEV;
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}
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#endif
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2008-07-22 10:11:55 +00:00
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int usb_serial_generic_register(int _debug)
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2005-04-16 22:20:36 +00:00
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{
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int retval = 0;
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debug = _debug;
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#ifdef CONFIG_USB_SERIAL_GENERIC
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generic_device_ids[0].idVendor = vendor;
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generic_device_ids[0].idProduct = product;
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2008-07-22 10:11:55 +00:00
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generic_device_ids[0].match_flags =
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USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT;
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2005-04-16 22:20:36 +00:00
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/* register our generic driver with ourselves */
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2008-07-22 10:11:55 +00:00
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retval = usb_serial_register(&usb_serial_generic_device);
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2005-04-16 22:20:36 +00:00
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if (retval)
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goto exit;
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retval = usb_register(&generic_driver);
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if (retval)
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usb_serial_deregister(&usb_serial_generic_device);
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exit:
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#endif
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return retval;
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}
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2008-07-22 10:11:55 +00:00
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void usb_serial_generic_deregister(void)
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2005-04-16 22:20:36 +00:00
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{
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#ifdef CONFIG_USB_SERIAL_GENERIC
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/* remove our generic driver */
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usb_deregister(&generic_driver);
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2008-07-22 10:11:55 +00:00
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usb_serial_deregister(&usb_serial_generic_device);
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2005-04-16 22:20:36 +00:00
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#endif
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}
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2008-07-22 10:09:07 +00:00
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int usb_serial_generic_open(struct tty_struct *tty,
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struct usb_serial_port *port, struct file *filp)
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2005-04-16 22:20:36 +00:00
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{
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struct usb_serial *serial = port->serial;
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int result = 0;
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2007-02-01 19:08:18 +00:00
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unsigned long flags;
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2005-04-16 22:20:36 +00:00
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2008-03-04 00:08:34 +00:00
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dbg("%s - port %d", __func__, port->number);
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2005-04-16 22:20:36 +00:00
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2007-02-01 19:08:18 +00:00
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/* clear the throttle flags */
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spin_lock_irqsave(&port->lock, flags);
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port->throttled = 0;
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port->throttle_req = 0;
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spin_unlock_irqrestore(&port->lock, flags);
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/* if we have a bulk endpoint, start reading from it */
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2005-04-16 22:20:36 +00:00
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if (serial->num_bulk_in) {
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/* Start reading from the device */
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2008-07-22 10:11:55 +00:00
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usb_fill_bulk_urb(port->read_urb, serial->dev,
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usb_rcvbulkpipe(serial->dev,
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port->bulk_in_endpointAddress),
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2005-04-16 22:20:36 +00:00
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port->read_urb->transfer_buffer,
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port->read_urb->transfer_buffer_length,
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((serial->type->read_bulk_callback) ?
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serial->type->read_bulk_callback :
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usb_serial_generic_read_bulk_callback),
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port);
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result = usb_submit_urb(port->read_urb, GFP_KERNEL);
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if (result)
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2008-07-22 10:11:55 +00:00
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dev_err(&port->dev,
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"%s - failed resubmitting read urb, error %d\n",
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__func__, result);
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2005-04-16 22:20:36 +00:00
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}
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return result;
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}
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2006-05-12 18:05:29 +00:00
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EXPORT_SYMBOL_GPL(usb_serial_generic_open);
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2005-04-16 22:20:36 +00:00
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2008-07-22 10:09:07 +00:00
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static void generic_cleanup(struct usb_serial_port *port)
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2005-04-16 22:20:36 +00:00
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{
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struct usb_serial *serial = port->serial;
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2008-03-04 00:08:34 +00:00
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dbg("%s - port %d", __func__, port->number);
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2005-04-16 22:20:36 +00:00
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if (serial->dev) {
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/* shutdown any bulk reads that might be going on */
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if (serial->num_bulk_out)
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usb_kill_urb(port->write_urb);
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if (serial->num_bulk_in)
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usb_kill_urb(port->read_urb);
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}
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}
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2007-04-27 18:54:57 +00:00
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int usb_serial_generic_resume(struct usb_serial *serial)
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{
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struct usb_serial_port *port;
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int i, c = 0, r;
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for (i = 0; i < serial->num_ports; i++) {
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port = serial->port[i];
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2008-07-22 10:09:07 +00:00
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if (port->port.count && port->read_urb) {
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2007-04-27 18:54:57 +00:00
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r = usb_submit_urb(port->read_urb, GFP_NOIO);
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if (r < 0)
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c++;
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}
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}
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return c ? -EIO : 0;
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}
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2009-02-06 14:37:14 +00:00
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EXPORT_SYMBOL_GPL(usb_serial_generic_resume);
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2007-04-27 18:54:57 +00:00
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2008-07-22 10:09:07 +00:00
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void usb_serial_generic_close(struct tty_struct *tty,
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2008-07-22 10:11:55 +00:00
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struct usb_serial_port *port, struct file *filp)
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2005-04-16 22:20:36 +00:00
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{
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2008-03-04 00:08:34 +00:00
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dbg("%s - port %d", __func__, port->number);
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2008-07-22 10:11:55 +00:00
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generic_cleanup(port);
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2005-04-16 22:20:36 +00:00
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}
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2008-07-22 10:09:07 +00:00
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int usb_serial_generic_write(struct tty_struct *tty,
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struct usb_serial_port *port, const unsigned char *buf, int count)
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2005-04-16 22:20:36 +00:00
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{
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struct usb_serial *serial = port->serial;
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int result;
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unsigned char *data;
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2008-03-04 00:08:34 +00:00
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dbg("%s - port %d", __func__, port->number);
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2005-04-16 22:20:36 +00:00
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if (count == 0) {
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2008-03-04 00:08:34 +00:00
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dbg("%s - write request of 0 bytes", __func__);
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2008-07-22 10:11:55 +00:00
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return 0;
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2005-04-16 22:20:36 +00:00
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}
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/* only do something if we have a bulk out endpoint */
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if (serial->num_bulk_out) {
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2007-10-19 22:05:19 +00:00
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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2005-04-23 19:49:16 +00:00
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if (port->write_urb_busy) {
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2007-10-19 22:05:19 +00:00
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spin_unlock_irqrestore(&port->lock, flags);
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2008-03-04 00:08:34 +00:00
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dbg("%s - already writing", __func__);
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2005-04-23 19:49:16 +00:00
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return 0;
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2005-04-16 22:20:36 +00:00
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}
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2005-04-23 19:49:16 +00:00
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port->write_urb_busy = 1;
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2007-10-19 22:05:19 +00:00
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spin_unlock_irqrestore(&port->lock, flags);
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2005-04-16 22:20:36 +00:00
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2008-07-22 10:11:55 +00:00
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count = (count > port->bulk_out_size) ?
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port->bulk_out_size : count;
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2005-04-16 22:20:36 +00:00
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2008-07-22 10:11:55 +00:00
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memcpy(port->write_urb->transfer_buffer, buf, count);
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2005-04-16 22:20:36 +00:00
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data = port->write_urb->transfer_buffer;
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2008-03-04 00:08:34 +00:00
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usb_serial_debug_data(debug, &port->dev, __func__, count, data);
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2005-04-16 22:20:36 +00:00
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/* set up our urb */
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2008-07-22 10:11:55 +00:00
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usb_fill_bulk_urb(port->write_urb, serial->dev,
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usb_sndbulkpipe(serial->dev,
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port->bulk_out_endpointAddress),
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2005-04-16 22:20:36 +00:00
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port->write_urb->transfer_buffer, count,
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2008-07-22 10:11:55 +00:00
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((serial->type->write_bulk_callback) ?
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2005-04-16 22:20:36 +00:00
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serial->type->write_bulk_callback :
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2008-07-22 10:11:55 +00:00
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usb_serial_generic_write_bulk_callback),
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port);
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2005-04-16 22:20:36 +00:00
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/* send the data out the bulk port */
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2005-04-23 19:49:16 +00:00
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port->write_urb_busy = 1;
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2005-04-16 22:20:36 +00:00
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result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
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2005-04-23 19:49:16 +00:00
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if (result) {
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2008-07-22 10:11:55 +00:00
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dev_err(&port->dev,
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"%s - failed submitting write urb, error %d\n",
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__func__, result);
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/* don't have to grab the lock here, as we will
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retry if != 0 */
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2005-04-23 19:49:16 +00:00
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port->write_urb_busy = 0;
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} else
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2005-04-16 22:20:36 +00:00
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result = count;
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return result;
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}
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/* no bulk out, so return 0 bytes written */
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2005-04-23 19:49:16 +00:00
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return 0;
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2005-04-16 22:20:36 +00:00
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}
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2008-07-22 10:11:55 +00:00
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int usb_serial_generic_write_room(struct tty_struct *tty)
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2005-04-16 22:20:36 +00:00
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{
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2008-07-22 10:09:07 +00:00
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struct usb_serial_port *port = tty->driver_data;
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2005-04-16 22:20:36 +00:00
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struct usb_serial *serial = port->serial;
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int room = 0;
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2008-03-04 00:08:34 +00:00
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dbg("%s - port %d", __func__, port->number);
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2005-04-23 19:49:16 +00:00
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2008-04-08 16:16:06 +00:00
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/* FIXME: Locking */
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2005-04-16 22:20:36 +00:00
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if (serial->num_bulk_out) {
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2005-10-15 00:21:50 +00:00
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if (!(port->write_urb_busy))
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2005-04-16 22:20:36 +00:00
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room = port->bulk_out_size;
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}
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2008-03-04 00:08:34 +00:00
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dbg("%s - returns %d", __func__, room);
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2008-04-08 16:16:06 +00:00
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return room;
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2005-04-16 22:20:36 +00:00
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}
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2008-07-22 10:09:07 +00:00
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int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
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2005-04-16 22:20:36 +00:00
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{
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2008-07-22 10:09:07 +00:00
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struct usb_serial_port *port = tty->driver_data;
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2005-04-16 22:20:36 +00:00
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struct usb_serial *serial = port->serial;
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int chars = 0;
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2008-03-04 00:08:34 +00:00
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dbg("%s - port %d", __func__, port->number);
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2005-04-16 22:20:36 +00:00
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2008-04-08 16:16:06 +00:00
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/* FIXME: Locking */
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2005-04-16 22:20:36 +00:00
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if (serial->num_bulk_out) {
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2005-04-23 19:49:16 +00:00
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if (port->write_urb_busy)
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2005-04-16 22:20:36 +00:00
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chars = port->write_urb->transfer_buffer_length;
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}
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2008-03-04 00:08:34 +00:00
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dbg("%s - returns %d", __func__, chars);
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2008-07-22 10:09:07 +00:00
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return chars;
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2005-04-16 22:20:36 +00:00
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}
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2007-05-07 10:09:33 +00:00
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|
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static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
|
2005-04-16 22:20:36 +00:00
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|
|
{
|
2007-02-01 19:08:18 +00:00
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struct urb *urb = port->read_urb;
|
2007-05-07 10:09:33 +00:00
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struct usb_serial *serial = port->serial;
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2005-04-16 22:20:36 +00:00
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int result;
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|
2007-02-01 19:08:18 +00:00
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/* Continue reading from device */
|
2008-07-22 10:11:55 +00:00
|
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usb_fill_bulk_urb(urb, serial->dev,
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usb_rcvbulkpipe(serial->dev,
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port->bulk_in_endpointAddress),
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2007-05-07 10:09:33 +00:00
|
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urb->transfer_buffer,
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urb->transfer_buffer_length,
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2008-07-22 10:11:55 +00:00
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((serial->type->read_bulk_callback) ?
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serial->type->read_bulk_callback :
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2005-04-16 22:20:36 +00:00
|
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usb_serial_generic_read_bulk_callback), port);
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2007-05-07 10:09:33 +00:00
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result = usb_submit_urb(urb, mem_flags);
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2005-04-16 22:20:36 +00:00
|
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if (result)
|
2008-07-22 10:11:55 +00:00
|
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dev_err(&port->dev,
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"%s - failed resubmitting read urb, error %d\n",
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__func__, result);
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2005-04-16 22:20:36 +00:00
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}
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2007-02-01 19:08:18 +00:00
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2007-05-07 10:09:33 +00:00
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|
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/* Push data to tty layer and resubmit the bulk read URB */
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2008-07-22 10:09:07 +00:00
|
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static void flush_and_resubmit_read_urb(struct usb_serial_port *port)
|
2007-05-07 10:09:33 +00:00
|
|
|
{
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struct urb *urb = port->read_urb;
|
2008-10-13 09:39:46 +00:00
|
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struct tty_struct *tty = tty_port_tty_get(&port->port);
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2007-05-07 10:09:33 +00:00
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int room;
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|
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/* Push data to tty */
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|
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if (tty && urb->actual_length) {
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|
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room = tty_buffer_request_room(tty, urb->actual_length);
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|
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if (room) {
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tty_insert_flip_string(tty, urb->transfer_buffer, room);
|
2008-03-05 07:28:42 +00:00
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tty_flip_buffer_push(tty);
|
2007-05-07 10:09:33 +00:00
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}
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}
|
2008-10-13 09:39:46 +00:00
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tty_kref_put(tty);
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2007-05-07 10:09:33 +00:00
|
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resubmit_read_urb(port, GFP_ATOMIC);
|
|
|
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}
|
|
|
|
|
2008-07-22 10:09:07 +00:00
|
|
|
void usb_serial_generic_read_bulk_callback(struct urb *urb)
|
2007-02-01 19:08:18 +00:00
|
|
|
{
|
2008-02-24 10:41:47 +00:00
|
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|
struct usb_serial_port *port = urb->context;
|
2007-02-01 19:08:18 +00:00
|
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unsigned char *data = urb->transfer_buffer;
|
2007-06-15 22:44:13 +00:00
|
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|
int status = urb->status;
|
2007-10-28 12:24:16 +00:00
|
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unsigned long flags;
|
2007-02-01 19:08:18 +00:00
|
|
|
|
2008-03-04 00:08:34 +00:00
|
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dbg("%s - port %d", __func__, port->number);
|
2007-02-01 19:08:18 +00:00
|
|
|
|
2007-06-15 22:44:13 +00:00
|
|
|
if (unlikely(status != 0)) {
|
|
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|
dbg("%s - nonzero read bulk status received: %d",
|
2008-03-04 00:08:34 +00:00
|
|
|
__func__, status);
|
2007-02-01 19:08:18 +00:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2008-07-22 10:11:55 +00:00
|
|
|
usb_serial_debug_data(debug, &port->dev, __func__,
|
|
|
|
urb->actual_length, data);
|
2007-02-01 19:08:18 +00:00
|
|
|
|
|
|
|
/* Throttle the device if requested by tty */
|
2007-10-28 12:24:16 +00:00
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
2008-07-22 10:11:55 +00:00
|
|
|
port->throttled = port->throttle_req;
|
|
|
|
if (!port->throttled) {
|
2008-03-05 07:28:42 +00:00
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
2007-05-07 10:09:33 +00:00
|
|
|
flush_and_resubmit_read_urb(port);
|
2008-07-22 10:11:55 +00:00
|
|
|
} else
|
2008-03-05 07:28:42 +00:00
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
2007-02-01 19:08:18 +00:00
|
|
|
}
|
2006-07-11 17:19:25 +00:00
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-07-22 10:09:07 +00:00
|
|
|
void usb_serial_generic_write_bulk_callback(struct urb *urb)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2008-02-24 10:41:47 +00:00
|
|
|
struct usb_serial_port *port = urb->context;
|
2007-06-15 22:44:13 +00:00
|
|
|
int status = urb->status;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-03-04 00:08:34 +00:00
|
|
|
dbg("%s - port %d", __func__, port->number);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-04-23 19:49:16 +00:00
|
|
|
port->write_urb_busy = 0;
|
2007-06-15 22:44:13 +00:00
|
|
|
if (status) {
|
|
|
|
dbg("%s - nonzero write bulk status received: %d",
|
2008-03-04 00:08:34 +00:00
|
|
|
__func__, status);
|
2005-04-16 22:20:36 +00:00
|
|
|
return;
|
|
|
|
}
|
2006-05-23 04:58:49 +00:00
|
|
|
usb_serial_port_softint(port);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2005-11-17 17:48:18 +00:00
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-07-22 10:09:07 +00:00
|
|
|
void usb_serial_generic_throttle(struct tty_struct *tty)
|
2007-02-01 19:08:18 +00:00
|
|
|
{
|
2008-07-22 10:09:07 +00:00
|
|
|
struct usb_serial_port *port = tty->driver_data;
|
2007-02-01 19:08:18 +00:00
|
|
|
unsigned long flags;
|
|
|
|
|
2008-03-04 00:08:34 +00:00
|
|
|
dbg("%s - port %d", __func__, port->number);
|
2007-02-01 19:08:18 +00:00
|
|
|
|
|
|
|
/* Set the throttle request flag. It will be picked up
|
|
|
|
* by usb_serial_generic_read_bulk_callback(). */
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
port->throttle_req = 1;
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
}
|
|
|
|
|
2008-07-22 10:09:07 +00:00
|
|
|
void usb_serial_generic_unthrottle(struct tty_struct *tty)
|
2007-02-01 19:08:18 +00:00
|
|
|
{
|
2008-07-22 10:09:07 +00:00
|
|
|
struct usb_serial_port *port = tty->driver_data;
|
2007-02-01 19:08:18 +00:00
|
|
|
int was_throttled;
|
|
|
|
unsigned long flags;
|
|
|
|
|
2008-03-04 00:08:34 +00:00
|
|
|
dbg("%s - port %d", __func__, port->number);
|
2007-02-01 19:08:18 +00:00
|
|
|
|
|
|
|
/* Clear the throttle flags */
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
was_throttled = port->throttled;
|
|
|
|
port->throttled = port->throttle_req = 0;
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
|
|
|
|
if (was_throttled) {
|
2007-05-07 10:09:33 +00:00
|
|
|
/* Resume reading from device */
|
|
|
|
resubmit_read_urb(port, GFP_KERNEL);
|
2007-02-01 19:08:18 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-07-22 10:11:55 +00:00
|
|
|
void usb_serial_generic_shutdown(struct usb_serial *serial)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
2008-03-04 00:08:34 +00:00
|
|
|
dbg("%s", __func__);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* stop reads and writes on all ports */
|
2008-07-22 10:11:55 +00:00
|
|
|
for (i = 0; i < serial->num_ports; ++i)
|
2005-04-16 22:20:36 +00:00
|
|
|
generic_cleanup(serial->port[i]);
|
|
|
|
}
|
|
|
|
|