421 lines
11 KiB
C
421 lines
11 KiB
C
/*
|
|
* USB Serial Converter Generic functions
|
|
*
|
|
* Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/tty_flip.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/serial.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
|
|
static int debug;
|
|
|
|
#ifdef CONFIG_USB_SERIAL_GENERIC
|
|
|
|
static int generic_probe(struct usb_interface *interface,
|
|
const struct usb_device_id *id);
|
|
|
|
static __u16 vendor = 0x05f9;
|
|
static __u16 product = 0xffff;
|
|
|
|
module_param(vendor, ushort, 0);
|
|
MODULE_PARM_DESC(vendor, "User specified USB idVendor");
|
|
|
|
module_param(product, ushort, 0);
|
|
MODULE_PARM_DESC(product, "User specified USB idProduct");
|
|
|
|
static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */
|
|
|
|
/* we want to look at all devices, as the vendor/product id can change
|
|
* depending on the command line argument */
|
|
static struct usb_device_id generic_serial_ids[] = {
|
|
{.driver_info = 42},
|
|
{}
|
|
};
|
|
|
|
static struct usb_driver generic_driver = {
|
|
.name = "usbserial_generic",
|
|
.probe = generic_probe,
|
|
.disconnect = usb_serial_disconnect,
|
|
.id_table = generic_serial_ids,
|
|
.no_dynamic_id = 1,
|
|
};
|
|
|
|
/* All of the device info needed for the Generic Serial Converter */
|
|
struct usb_serial_driver usb_serial_generic_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "generic",
|
|
},
|
|
.id_table = generic_device_ids,
|
|
.usb_driver = &generic_driver,
|
|
.num_ports = 1,
|
|
.shutdown = usb_serial_generic_shutdown,
|
|
.throttle = usb_serial_generic_throttle,
|
|
.unthrottle = usb_serial_generic_unthrottle,
|
|
.resume = usb_serial_generic_resume,
|
|
};
|
|
|
|
static int generic_probe(struct usb_interface *interface,
|
|
const struct usb_device_id *id)
|
|
{
|
|
const struct usb_device_id *id_pattern;
|
|
|
|
id_pattern = usb_match_id(interface, generic_device_ids);
|
|
if (id_pattern != NULL)
|
|
return usb_serial_probe(interface, id);
|
|
return -ENODEV;
|
|
}
|
|
#endif
|
|
|
|
int usb_serial_generic_register (int _debug)
|
|
{
|
|
int retval = 0;
|
|
|
|
debug = _debug;
|
|
#ifdef CONFIG_USB_SERIAL_GENERIC
|
|
generic_device_ids[0].idVendor = vendor;
|
|
generic_device_ids[0].idProduct = product;
|
|
generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT;
|
|
|
|
/* register our generic driver with ourselves */
|
|
retval = usb_serial_register (&usb_serial_generic_device);
|
|
if (retval)
|
|
goto exit;
|
|
retval = usb_register(&generic_driver);
|
|
if (retval)
|
|
usb_serial_deregister(&usb_serial_generic_device);
|
|
exit:
|
|
#endif
|
|
return retval;
|
|
}
|
|
|
|
void usb_serial_generic_deregister (void)
|
|
{
|
|
#ifdef CONFIG_USB_SERIAL_GENERIC
|
|
/* remove our generic driver */
|
|
usb_deregister(&generic_driver);
|
|
usb_serial_deregister (&usb_serial_generic_device);
|
|
#endif
|
|
}
|
|
|
|
int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp)
|
|
{
|
|
struct usb_serial *serial = port->serial;
|
|
int result = 0;
|
|
unsigned long flags;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
/* force low_latency on so that our tty_push actually forces the data through,
|
|
otherwise it is scheduled, and with high data rates (like with OHCI) data
|
|
can get lost. */
|
|
if (port->tty)
|
|
port->tty->low_latency = 1;
|
|
|
|
/* clear the throttle flags */
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
port->throttled = 0;
|
|
port->throttle_req = 0;
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
/* if we have a bulk endpoint, start reading from it */
|
|
if (serial->num_bulk_in) {
|
|
/* Start reading from the device */
|
|
usb_fill_bulk_urb (port->read_urb, serial->dev,
|
|
usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
|
|
port->read_urb->transfer_buffer,
|
|
port->read_urb->transfer_buffer_length,
|
|
((serial->type->read_bulk_callback) ?
|
|
serial->type->read_bulk_callback :
|
|
usb_serial_generic_read_bulk_callback),
|
|
port);
|
|
result = usb_submit_urb(port->read_urb, GFP_KERNEL);
|
|
if (result)
|
|
dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_open);
|
|
|
|
static void generic_cleanup (struct usb_serial_port *port)
|
|
{
|
|
struct usb_serial *serial = port->serial;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
if (serial->dev) {
|
|
/* shutdown any bulk reads that might be going on */
|
|
if (serial->num_bulk_out)
|
|
usb_kill_urb(port->write_urb);
|
|
if (serial->num_bulk_in)
|
|
usb_kill_urb(port->read_urb);
|
|
}
|
|
}
|
|
|
|
int usb_serial_generic_resume(struct usb_serial *serial)
|
|
{
|
|
struct usb_serial_port *port;
|
|
int i, c = 0, r;
|
|
|
|
#ifdef CONFIG_PM
|
|
/*
|
|
* If this is an autoresume, don't submit URBs.
|
|
* They will be submitted in the open function instead.
|
|
*/
|
|
if (serial->dev->auto_pm)
|
|
return 0;
|
|
#endif
|
|
for (i = 0; i < serial->num_ports; i++) {
|
|
port = serial->port[i];
|
|
if (port->open_count && port->read_urb) {
|
|
r = usb_submit_urb(port->read_urb, GFP_NOIO);
|
|
if (r < 0)
|
|
c++;
|
|
}
|
|
}
|
|
|
|
return c ? -EIO : 0;
|
|
}
|
|
|
|
void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp)
|
|
{
|
|
dbg("%s - port %d", __func__, port->number);
|
|
generic_cleanup (port);
|
|
}
|
|
|
|
int usb_serial_generic_write(struct usb_serial_port *port, const unsigned char *buf, int count)
|
|
{
|
|
struct usb_serial *serial = port->serial;
|
|
int result;
|
|
unsigned char *data;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
if (count == 0) {
|
|
dbg("%s - write request of 0 bytes", __func__);
|
|
return (0);
|
|
}
|
|
|
|
/* only do something if we have a bulk out endpoint */
|
|
if (serial->num_bulk_out) {
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
if (port->write_urb_busy) {
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
dbg("%s - already writing", __func__);
|
|
return 0;
|
|
}
|
|
port->write_urb_busy = 1;
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
count = (count > port->bulk_out_size) ? port->bulk_out_size : count;
|
|
|
|
memcpy (port->write_urb->transfer_buffer, buf, count);
|
|
data = port->write_urb->transfer_buffer;
|
|
usb_serial_debug_data(debug, &port->dev, __func__, count, data);
|
|
|
|
/* set up our urb */
|
|
usb_fill_bulk_urb (port->write_urb, serial->dev,
|
|
usb_sndbulkpipe (serial->dev,
|
|
port->bulk_out_endpointAddress),
|
|
port->write_urb->transfer_buffer, count,
|
|
((serial->type->write_bulk_callback) ?
|
|
serial->type->write_bulk_callback :
|
|
usb_serial_generic_write_bulk_callback), port);
|
|
|
|
/* send the data out the bulk port */
|
|
port->write_urb_busy = 1;
|
|
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
|
|
if (result) {
|
|
dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __func__, result);
|
|
/* don't have to grab the lock here, as we will retry if != 0 */
|
|
port->write_urb_busy = 0;
|
|
} else
|
|
result = count;
|
|
|
|
return result;
|
|
}
|
|
|
|
/* no bulk out, so return 0 bytes written */
|
|
return 0;
|
|
}
|
|
|
|
int usb_serial_generic_write_room (struct usb_serial_port *port)
|
|
{
|
|
struct usb_serial *serial = port->serial;
|
|
int room = 0;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
/* FIXME: Locking */
|
|
if (serial->num_bulk_out) {
|
|
if (!(port->write_urb_busy))
|
|
room = port->bulk_out_size;
|
|
}
|
|
|
|
dbg("%s - returns %d", __func__, room);
|
|
return room;
|
|
}
|
|
|
|
int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port)
|
|
{
|
|
struct usb_serial *serial = port->serial;
|
|
int chars = 0;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
/* FIXME: Locking */
|
|
if (serial->num_bulk_out) {
|
|
if (port->write_urb_busy)
|
|
chars = port->write_urb->transfer_buffer_length;
|
|
}
|
|
|
|
dbg("%s - returns %d", __func__, chars);
|
|
return (chars);
|
|
}
|
|
|
|
|
|
static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
|
|
{
|
|
struct urb *urb = port->read_urb;
|
|
struct usb_serial *serial = port->serial;
|
|
int result;
|
|
|
|
/* Continue reading from device */
|
|
usb_fill_bulk_urb (urb, serial->dev,
|
|
usb_rcvbulkpipe (serial->dev,
|
|
port->bulk_in_endpointAddress),
|
|
urb->transfer_buffer,
|
|
urb->transfer_buffer_length,
|
|
((serial->type->read_bulk_callback) ?
|
|
serial->type->read_bulk_callback :
|
|
usb_serial_generic_read_bulk_callback), port);
|
|
result = usb_submit_urb(urb, mem_flags);
|
|
if (result)
|
|
dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result);
|
|
}
|
|
|
|
/* Push data to tty layer and resubmit the bulk read URB */
|
|
static void flush_and_resubmit_read_urb (struct usb_serial_port *port)
|
|
{
|
|
struct urb *urb = port->read_urb;
|
|
struct tty_struct *tty = port->tty;
|
|
int room;
|
|
|
|
/* Push data to tty */
|
|
if (tty && urb->actual_length) {
|
|
room = tty_buffer_request_room(tty, urb->actual_length);
|
|
if (room) {
|
|
tty_insert_flip_string(tty, urb->transfer_buffer, room);
|
|
tty_flip_buffer_push(tty);
|
|
}
|
|
}
|
|
|
|
resubmit_read_urb(port, GFP_ATOMIC);
|
|
}
|
|
|
|
void usb_serial_generic_read_bulk_callback (struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
unsigned char *data = urb->transfer_buffer;
|
|
int status = urb->status;
|
|
unsigned long flags;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
if (unlikely(status != 0)) {
|
|
dbg("%s - nonzero read bulk status received: %d",
|
|
__func__, status);
|
|
return;
|
|
}
|
|
|
|
usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length, data);
|
|
|
|
/* Throttle the device if requested by tty */
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
if (!(port->throttled = port->throttle_req)) {
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
flush_and_resubmit_read_urb(port);
|
|
} else {
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
|
|
|
|
void usb_serial_generic_write_bulk_callback (struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
int status = urb->status;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
port->write_urb_busy = 0;
|
|
if (status) {
|
|
dbg("%s - nonzero write bulk status received: %d",
|
|
__func__, status);
|
|
return;
|
|
}
|
|
usb_serial_port_softint(port);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);
|
|
|
|
void usb_serial_generic_throttle (struct usb_serial_port *port)
|
|
{
|
|
unsigned long flags;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
void usb_serial_generic_unthrottle (struct usb_serial_port *port)
|
|
{
|
|
int was_throttled;
|
|
unsigned long flags;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
/* 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) {
|
|
/* Resume reading from device */
|
|
resubmit_read_urb(port, GFP_KERNEL);
|
|
}
|
|
}
|
|
|
|
void usb_serial_generic_shutdown (struct usb_serial *serial)
|
|
{
|
|
int i;
|
|
|
|
dbg("%s", __func__);
|
|
|
|
/* stop reads and writes on all ports */
|
|
for (i=0; i < serial->num_ports; ++i) {
|
|
generic_cleanup(serial->port[i]);
|
|
}
|
|
}
|
|
|