![Alan Cox](/assets/img/avatar_default.png)
The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
511 lines
14 KiB
C
511 lines
14 KiB
C
/*
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* REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver
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*
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* Copyright (C) 2001 REINER SCT
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* Author: Matthias Bruestle
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*
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* Contact: support@reiner-sct.com (see MAINTAINERS)
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*
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* This program is largely derived from work by the linux-usb group
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* and associated source files. Please see the usb/serial files for
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* individual credits and copyrights.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
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* patience.
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*
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* In case of problems, please write to the contact e-mail address
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* mentioned above.
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*
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* Please note that later models of the cyberjack reader family are
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* supported by a libusb-based userspace device driver.
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*
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* Homepage: http://www.reiner-sct.de/support/treiber_cyberjack.php#linux
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <asm/uaccess.h>
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#include <linux/usb.h>
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#include "usb-serial.h"
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#define CYBERJACK_LOCAL_BUF_SIZE 32
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static int debug;
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v1.01"
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#define DRIVER_AUTHOR "Matthias Bruestle"
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#define DRIVER_DESC "REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver"
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#define CYBERJACK_VENDOR_ID 0x0C4B
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#define CYBERJACK_PRODUCT_ID 0x0100
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/* Function prototypes */
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static int cyberjack_startup (struct usb_serial *serial);
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static void cyberjack_shutdown (struct usb_serial *serial);
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static int cyberjack_open (struct usb_serial_port *port, struct file *filp);
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static void cyberjack_close (struct usb_serial_port *port, struct file *filp);
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static int cyberjack_write (struct usb_serial_port *port, const unsigned char *buf, int count);
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static int cyberjack_write_room( struct usb_serial_port *port );
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static void cyberjack_read_int_callback (struct urb *urb, struct pt_regs *regs);
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static void cyberjack_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
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static void cyberjack_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
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static struct usb_device_id id_table [] = {
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{ USB_DEVICE(CYBERJACK_VENDOR_ID, CYBERJACK_PRODUCT_ID) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE (usb, id_table);
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static struct usb_driver cyberjack_driver = {
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.name = "cyberjack",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = id_table,
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.no_dynamic_id = 1,
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};
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static struct usb_serial_driver cyberjack_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "cyberjack",
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},
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.description = "Reiner SCT Cyberjack USB card reader",
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.id_table = id_table,
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.num_interrupt_in = 1,
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.num_bulk_in = 1,
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.num_bulk_out = 1,
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.num_ports = 1,
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.attach = cyberjack_startup,
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.shutdown = cyberjack_shutdown,
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.open = cyberjack_open,
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.close = cyberjack_close,
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.write = cyberjack_write,
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.write_room = cyberjack_write_room,
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.read_int_callback = cyberjack_read_int_callback,
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.read_bulk_callback = cyberjack_read_bulk_callback,
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.write_bulk_callback = cyberjack_write_bulk_callback,
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};
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struct cyberjack_private {
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spinlock_t lock; /* Lock for SMP */
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short rdtodo; /* Bytes still to read */
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unsigned char wrbuf[5*64]; /* Buffer for collecting data to write */
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short wrfilled; /* Overall data size we already got */
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short wrsent; /* Data already sent */
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};
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/* do some startup allocations not currently performed by usb_serial_probe() */
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static int cyberjack_startup (struct usb_serial *serial)
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{
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struct cyberjack_private *priv;
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int i;
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dbg("%s", __FUNCTION__);
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/* allocate the private data structure */
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priv = kmalloc(sizeof(struct cyberjack_private), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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/* set initial values */
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spin_lock_init(&priv->lock);
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priv->rdtodo = 0;
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priv->wrfilled = 0;
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priv->wrsent = 0;
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usb_set_serial_port_data(serial->port[0], priv);
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init_waitqueue_head(&serial->port[0]->write_wait);
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for (i = 0; i < serial->num_ports; ++i) {
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int result;
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serial->port[i]->interrupt_in_urb->dev = serial->dev;
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result = usb_submit_urb(serial->port[i]->interrupt_in_urb,
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GFP_KERNEL);
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if (result)
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err(" usb_submit_urb(read int) failed");
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dbg("%s - usb_submit_urb(int urb)", __FUNCTION__);
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}
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return( 0 );
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}
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static void cyberjack_shutdown (struct usb_serial *serial)
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{
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int i;
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dbg("%s", __FUNCTION__);
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for (i=0; i < serial->num_ports; ++i) {
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usb_kill_urb(serial->port[i]->interrupt_in_urb);
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/* My special items, the standard routines free my urbs */
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kfree(usb_get_serial_port_data(serial->port[i]));
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usb_set_serial_port_data(serial->port[i], NULL);
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}
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}
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static int cyberjack_open (struct usb_serial_port *port, struct file *filp)
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{
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struct cyberjack_private *priv;
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unsigned long flags;
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int result = 0;
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dbg("%s - port %d", __FUNCTION__, port->number);
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dbg("%s - usb_clear_halt", __FUNCTION__ );
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usb_clear_halt(port->serial->dev, port->write_urb->pipe);
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/* force low_latency on so that our tty_push actually forces
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* the data through, otherwise it is scheduled, and with high
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* data rates (like with OHCI) data can get lost.
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*/
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port->tty->low_latency = 1;
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priv = usb_get_serial_port_data(port);
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spin_lock_irqsave(&priv->lock, flags);
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priv->rdtodo = 0;
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priv->wrfilled = 0;
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priv->wrsent = 0;
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spin_unlock_irqrestore(&priv->lock, flags);
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return result;
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}
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static void cyberjack_close (struct usb_serial_port *port, struct file *filp)
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{
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dbg("%s - port %d", __FUNCTION__, port->number);
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if (port->serial->dev) {
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/* shutdown any bulk reads that might be going on */
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usb_kill_urb(port->write_urb);
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usb_kill_urb(port->read_urb);
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}
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}
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static int cyberjack_write (struct usb_serial_port *port, const unsigned char *buf, int count)
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{
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struct usb_serial *serial = port->serial;
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struct cyberjack_private *priv = usb_get_serial_port_data(port);
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unsigned long flags;
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int result;
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int wrexpected;
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dbg("%s - port %d", __FUNCTION__, port->number);
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if (count == 0) {
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dbg("%s - write request of 0 bytes", __FUNCTION__);
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return (0);
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}
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spin_lock(&port->lock);
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if (port->write_urb_busy) {
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spin_unlock(&port->lock);
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dbg("%s - already writing", __FUNCTION__);
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return 0;
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}
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port->write_urb_busy = 1;
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spin_unlock(&port->lock);
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spin_lock_irqsave(&priv->lock, flags);
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if( (count+priv->wrfilled)>sizeof(priv->wrbuf) ) {
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/* To much data for buffer. Reset buffer. */
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priv->wrfilled=0;
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spin_unlock_irqrestore(&priv->lock, flags);
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port->write_urb_busy = 0;
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return (0);
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}
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/* Copy data */
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memcpy (priv->wrbuf+priv->wrfilled, buf, count);
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usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count,
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priv->wrbuf+priv->wrfilled);
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priv->wrfilled += count;
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if( priv->wrfilled >= 3 ) {
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wrexpected = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
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dbg("%s - expected data: %d", __FUNCTION__, wrexpected);
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} else {
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wrexpected = sizeof(priv->wrbuf);
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}
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if( priv->wrfilled >= wrexpected ) {
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/* We have enough data to begin transmission */
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int length;
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dbg("%s - transmitting data (frame 1)", __FUNCTION__);
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length = (wrexpected > port->bulk_out_size) ? port->bulk_out_size : wrexpected;
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memcpy (port->write_urb->transfer_buffer, priv->wrbuf, length );
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priv->wrsent=length;
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/* set up our urb */
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usb_fill_bulk_urb(port->write_urb, serial->dev,
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usb_sndbulkpipe(serial->dev, port->bulk_out_endpointAddress),
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port->write_urb->transfer_buffer, length,
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((serial->type->write_bulk_callback) ?
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serial->type->write_bulk_callback :
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cyberjack_write_bulk_callback),
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port);
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/* send the data out the bulk port */
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result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
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if (result) {
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err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
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/* Throw away data. No better idea what to do with it. */
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priv->wrfilled=0;
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priv->wrsent=0;
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spin_unlock_irqrestore(&priv->lock, flags);
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port->write_urb_busy = 0;
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return 0;
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}
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dbg("%s - priv->wrsent=%d", __FUNCTION__,priv->wrsent);
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dbg("%s - priv->wrfilled=%d", __FUNCTION__,priv->wrfilled);
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if( priv->wrsent>=priv->wrfilled ) {
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dbg("%s - buffer cleaned", __FUNCTION__);
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memset( priv->wrbuf, 0, sizeof(priv->wrbuf) );
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priv->wrfilled=0;
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priv->wrsent=0;
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}
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}
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spin_unlock_irqrestore(&priv->lock, flags);
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return (count);
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}
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static int cyberjack_write_room( struct usb_serial_port *port )
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{
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return CYBERJACK_LOCAL_BUF_SIZE;
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}
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static void cyberjack_read_int_callback( struct urb *urb, struct pt_regs *regs )
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{
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struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
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struct cyberjack_private *priv = usb_get_serial_port_data(port);
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unsigned char *data = urb->transfer_buffer;
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int result;
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dbg("%s - port %d", __FUNCTION__, port->number);
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/* the urb might have been killed. */
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if (urb->status)
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return;
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usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
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/* React only to interrupts signaling a bulk_in transfer */
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if( (urb->actual_length==4) && (data[0]==0x01) ) {
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short old_rdtodo;
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int result;
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/* This is a announcement of coming bulk_ins. */
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unsigned short size = ((unsigned short)data[3]<<8)+data[2]+3;
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spin_lock(&priv->lock);
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old_rdtodo = priv->rdtodo;
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if( (old_rdtodo+size)<(old_rdtodo) ) {
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dbg( "To many bulk_in urbs to do." );
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spin_unlock(&priv->lock);
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goto resubmit;
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}
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/* "+=" is probably more fault tollerant than "=" */
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priv->rdtodo += size;
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dbg("%s - rdtodo: %d", __FUNCTION__, priv->rdtodo);
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spin_unlock(&priv->lock);
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if( !old_rdtodo ) {
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port->read_urb->dev = port->serial->dev;
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result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
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if( result )
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err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
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dbg("%s - usb_submit_urb(read urb)", __FUNCTION__);
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}
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}
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resubmit:
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port->interrupt_in_urb->dev = port->serial->dev;
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result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
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if (result)
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err(" usb_submit_urb(read int) failed");
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dbg("%s - usb_submit_urb(int urb)", __FUNCTION__);
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}
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static void cyberjack_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
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{
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struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
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struct cyberjack_private *priv = usb_get_serial_port_data(port);
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struct tty_struct *tty;
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unsigned char *data = urb->transfer_buffer;
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short todo;
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int result;
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dbg("%s - port %d", __FUNCTION__, port->number);
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usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
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if (urb->status) {
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dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
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return;
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}
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tty = port->tty;
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if (!tty) {
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dbg("%s - ignoring since device not open\n", __FUNCTION__);
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return;
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}
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if (urb->actual_length) {
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tty_buffer_request_room(tty, urb->actual_length);
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tty_insert_flip_string(tty, data, urb->actual_length);
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tty_flip_buffer_push(tty);
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}
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spin_lock(&priv->lock);
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/* Reduce urbs to do by one. */
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priv->rdtodo-=urb->actual_length;
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/* Just to be sure */
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if ( priv->rdtodo<0 ) priv->rdtodo = 0;
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todo = priv->rdtodo;
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spin_unlock(&priv->lock);
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dbg("%s - rdtodo: %d", __FUNCTION__, todo);
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/* Continue to read if we have still urbs to do. */
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if( todo /* || (urb->actual_length==port->bulk_in_endpointAddress)*/ ) {
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port->read_urb->dev = port->serial->dev;
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result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
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if (result)
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err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
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dbg("%s - usb_submit_urb(read urb)", __FUNCTION__);
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}
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}
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static void cyberjack_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
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{
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struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
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struct cyberjack_private *priv = usb_get_serial_port_data(port);
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dbg("%s - port %d", __FUNCTION__, port->number);
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port->write_urb_busy = 0;
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if (urb->status) {
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dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
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return;
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}
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spin_lock(&priv->lock);
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/* only do something if we have more data to send */
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if( priv->wrfilled ) {
|
|
int length, blksize, result;
|
|
|
|
dbg("%s - transmitting data (frame n)", __FUNCTION__);
|
|
|
|
length = ((priv->wrfilled - priv->wrsent) > port->bulk_out_size) ?
|
|
port->bulk_out_size : (priv->wrfilled - priv->wrsent);
|
|
|
|
memcpy (port->write_urb->transfer_buffer, priv->wrbuf + priv->wrsent,
|
|
length );
|
|
priv->wrsent+=length;
|
|
|
|
/* set up our urb */
|
|
usb_fill_bulk_urb(port->write_urb, port->serial->dev,
|
|
usb_sndbulkpipe(port->serial->dev, port->bulk_out_endpointAddress),
|
|
port->write_urb->transfer_buffer, length,
|
|
((port->serial->type->write_bulk_callback) ?
|
|
port->serial->type->write_bulk_callback :
|
|
cyberjack_write_bulk_callback),
|
|
port);
|
|
|
|
/* send the data out the bulk port */
|
|
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
|
|
if (result) {
|
|
err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
|
|
/* Throw away data. No better idea what to do with it. */
|
|
priv->wrfilled=0;
|
|
priv->wrsent=0;
|
|
goto exit;
|
|
}
|
|
|
|
dbg("%s - priv->wrsent=%d", __FUNCTION__,priv->wrsent);
|
|
dbg("%s - priv->wrfilled=%d", __FUNCTION__,priv->wrfilled);
|
|
|
|
blksize = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
|
|
|
|
if( (priv->wrsent>=priv->wrfilled) || (priv->wrsent>=blksize) ) {
|
|
dbg("%s - buffer cleaned", __FUNCTION__);
|
|
memset( priv->wrbuf, 0, sizeof(priv->wrbuf) );
|
|
priv->wrfilled=0;
|
|
priv->wrsent=0;
|
|
}
|
|
}
|
|
|
|
exit:
|
|
spin_unlock(&priv->lock);
|
|
schedule_work(&port->work);
|
|
}
|
|
|
|
static int __init cyberjack_init (void)
|
|
{
|
|
int retval;
|
|
retval = usb_serial_register(&cyberjack_device);
|
|
if (retval)
|
|
goto failed_usb_serial_register;
|
|
retval = usb_register(&cyberjack_driver);
|
|
if (retval)
|
|
goto failed_usb_register;
|
|
|
|
info(DRIVER_VERSION " " DRIVER_AUTHOR);
|
|
info(DRIVER_DESC);
|
|
|
|
return 0;
|
|
failed_usb_register:
|
|
usb_serial_deregister(&cyberjack_device);
|
|
failed_usb_serial_register:
|
|
return retval;
|
|
}
|
|
|
|
static void __exit cyberjack_exit (void)
|
|
{
|
|
usb_deregister (&cyberjack_driver);
|
|
usb_serial_deregister (&cyberjack_device);
|
|
}
|
|
|
|
module_init(cyberjack_init);
|
|
module_exit(cyberjack_exit);
|
|
|
|
MODULE_AUTHOR( DRIVER_AUTHOR );
|
|
MODULE_DESCRIPTION( DRIVER_DESC );
|
|
MODULE_VERSION( DRIVER_VERSION );
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(debug, "Debug enabled or not");
|