/* * 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_interrupt_in = NUM_DONT_CARE, .num_bulk_in = NUM_DONT_CARE, .num_bulk_out = NUM_DONT_CARE, .num_ports = 1, .shutdown = usb_serial_generic_shutdown, .throttle = usb_serial_generic_throttle, .unthrottle = usb_serial_generic_unthrottle,}; 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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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); }} void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp){ dbg("%s - port %d", __FUNCTION__, 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", __FUNCTION__, port->number); if (count == 0) { dbg("%s - write request of 0 bytes", __FUNCTION__); return (0); } /* only do something if we have a bulk out endpoint */ if (serial->num_bulk_out) { spin_lock_bh(&port->lock); if (port->write_urb_busy) { spin_unlock_bh(&port->lock); dbg("%s - already writing", __FUNCTION__); return 0; } port->write_urb_busy = 1; spin_unlock_bh(&port->lock); 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, __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, port->number); if (serial->num_bulk_out) { if (!(port->write_urb_busy)) room = port->bulk_out_size; } dbg("%s - returns %d", __FUNCTION__, 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", __FUNCTION__, port->number); if (serial->num_bulk_out) { if (port->write_urb_busy) chars = port->write_urb->transfer_buffer_length; } dbg("%s - returns %d", __FUNCTION__, chars); return (chars);} /* Push data to tty layer and resubmit the bulk read URB */static void flush_and_resubmit_read_urb (struct usb_serial_port *port){ struct usb_serial *serial = port->serial; struct urb *urb = port->read_urb; struct tty_struct *tty = port->tty; int result; /* Push data to tty */ if (tty && urb->actual_length) { tty_buffer_request_room(tty, urb->actual_length); tty_insert_flip_string(tty, urb->transfer_buffer, urb->actual_length); tty_flip_buffer_push(tty); /* is this allowed from an URB callback ? */ } /* Continue reading from 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_ATOMIC); if (result) dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);} void usb_serial_generic_read_bulk_callback (struct urb *urb){ struct usb_serial_port *port = (struct usb_serial_port *)urb->context; unsigned char *data = urb->transfer_buffer; int is_throttled; unsigned long flags; dbg("%s - port %d", __FUNCTION__, port->number); if (urb->status) { dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status); return; } usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data); /* Throttle the device if requested by tty */ if (urb->actual_length) { spin_lock_irqsave(&port->lock, flags); is_throttled = port->throttled = port->throttle_req; spin_unlock_irqrestore(&port->lock, flags); if (is_throttled) { /* Let the received data linger in the read URB; * usb_serial_generic_unthrottle() will pick it * up later. */ dbg("%s - throttling device", __FUNCTION__); return; } } /* Handle data and continue reading from device */ flush_and_resubmit_read_urb(port);}EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback); void usb_serial_generic_write_bulk_callback (struct urb *urb){ struct usb_serial_port *port = (struct usb_serial_port *)urb->context; dbg("%s - port %d", __FUNCTION__, port->number); port->write_urb_busy = 0; if (urb->status) { dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->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", __FUNCTION__, 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", __FUNCTION__, 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) { /* Handle pending data and resume reading from device */ flush_and_resubmit_read_urb(port); }} void usb_serial_generic_shutdown (struct usb_serial *serial){ int i; dbg("%s", __FUNCTION__); /* stop reads and writes on all ports */ for (i=0; i < serial->num_ports; ++i) { generic_cleanup(serial->port[i]); }}
/*
* 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_interrupt_in = NUM_DONT_CARE,
.num_bulk_in = NUM_DONT_CARE,
.num_bulk_out = NUM_DONT_CARE,
.num_ports = 1,
.shutdown = usb_serial_generic_shutdown,
.throttle = usb_serial_generic_throttle,
.unthrottle = usb_serial_generic_unthrottle,
};
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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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);
}
}
void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp)
{
dbg("%s - port %d", __FUNCTION__, 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", __FUNCTION__, port->number);
if (count == 0) {
dbg("%s - write request of 0 bytes", __FUNCTION__);
return (0);
}
/* only do something if we have a bulk out endpoint */
if (serial->num_bulk_out) {
spin_lock_bh(&port->lock);
if (port->write_urb_busy) {
spin_unlock_bh(&port->lock);
dbg("%s - already writing", __FUNCTION__);
return 0;
}
port->write_urb_busy = 1;
spin_unlock_bh(&port->lock);
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, __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, port->number);
if (serial->num_bulk_out) {
if (!(port->write_urb_busy))
room = port->bulk_out_size;
}
dbg("%s - returns %d", __FUNCTION__, 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", __FUNCTION__, port->number);
if (serial->num_bulk_out) {
if (port->write_urb_busy)
chars = port->write_urb->transfer_buffer_length;
}
dbg("%s - returns %d", __FUNCTION__, chars);
return (chars);
}
/* Push data to tty layer and resubmit the bulk read URB */
static void flush_and_resubmit_read_urb (struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
struct urb *urb = port->read_urb;
struct tty_struct *tty = port->tty;
int result;
/* Push data to tty */
if (tty && urb->actual_length) {
tty_buffer_request_room(tty, urb->actual_length);
tty_insert_flip_string(tty, urb->transfer_buffer, urb->actual_length);
tty_flip_buffer_push(tty); /* is this allowed from an URB callback ? */
}
/* Continue reading from 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_ATOMIC);
if (result)
dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
}
void usb_serial_generic_read_bulk_callback (struct urb *urb)
{
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
unsigned char *data = urb->transfer_buffer;
int is_throttled;
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
if (urb->status) {
dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
return;
}
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
/* Throttle the device if requested by tty */
if (urb->actual_length) {
spin_lock_irqsave(&port->lock, flags);
is_throttled = port->throttled = port->throttle_req;
spin_unlock_irqrestore(&port->lock, flags);
if (is_throttled) {
/* Let the received data linger in the read URB;
* usb_serial_generic_unthrottle() will pick it
* up later. */
dbg("%s - throttling device", __FUNCTION__);
return;
}
}
/* Handle data and continue reading from device */
flush_and_resubmit_read_urb(port);
}
EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
void usb_serial_generic_write_bulk_callback (struct urb *urb)
{
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
dbg("%s - port %d", __FUNCTION__, port->number);
port->write_urb_busy = 0;
if (urb->status) {
dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->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", __FUNCTION__, 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", __FUNCTION__, 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) {
/* Handle pending data and resume reading from device */
flush_and_resubmit_read_urb(port);
}
}
void usb_serial_generic_shutdown (struct usb_serial *serial)
{
int i;
dbg("%s", __FUNCTION__);
/* stop reads and writes on all ports */
for (i=0; i < serial->num_ports; ++i) {
generic_cleanup(serial->port[i]);
}
}