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marcus.erl |
/* r3964 linediscipline for linux
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*
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* -----------------------------------------------------------
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* Copyright by
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* Philips Automation Projects
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* Kassel (Germany)
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* http://www.pap-philips.de
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* -----------------------------------------------------------
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* This software may be used and distributed according to the terms of
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* the GNU General Public License, incorporated herein by reference.
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*
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* Author:
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* L. Haag
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*
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* $Log: n_r3964.c,v $
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* Revision 1.10 2001/03/18 13:02:24 dwmw2
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* Fix timer usage, use spinlocks properly.
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*
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* Revision 1.9 2001/03/18 12:52:14 dwmw2
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* Merge changes in 2.4.2
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*
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* Revision 1.8 2000/03/23 14:14:54 dwmw2
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* Fix race in sleeping in r3964_read()
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*
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* Revision 1.7 1999/28/08 11:41:50 dwmw2
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* Port to 2.3 kernel
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*
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* Revision 1.6 1998/09/30 00:40:40 dwmw2
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* Fixed compilation on 2.0.x kernels
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* Updated to newly registered tty-ldisc number 9
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*
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* Revision 1.5 1998/09/04 21:57:36 dwmw2
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* Signal handling bug fixes, port to 2.1.x.
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*
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* Revision 1.4 1998/04/02 20:26:59 lhaag
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* select, blocking, ...
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*
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* Revision 1.3 1998/02/12 18:58:43 root
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* fixed some memory leaks
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* calculation of checksum characters
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*
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* Revision 1.2 1998/02/07 13:03:34 root
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* ioctl read_telegram
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*
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* Revision 1.1 1998/02/06 19:21:03 root
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* Initial revision
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*
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/ptrace.h>
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#include <linux/ioport.h>
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#include <linux/in.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/errno.h>
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#include <linux/string.h> /* used in new tty drivers */
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#include <linux/signal.h> /* used in new tty drivers */
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#include <linux/ioctl.h>
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#include <linux/n_r3964.h>
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#include <linux/poll.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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/*#define DEBUG_QUEUE*/
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/* Log successful handshake and protocol operations */
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/*#define DEBUG_PROTO_S*/
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/* Log handshake and protocol errors: */
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/*#define DEBUG_PROTO_E*/
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/* Log Linediscipline operations (open, close, read, write...): */
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/*#define DEBUG_LDISC*/
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/* Log module and memory operations (init, cleanup; kmalloc, kfree): */
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/*#define DEBUG_MODUL*/
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/* Macro helpers for debug output: */
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#define TRACE(format, args...) printk("r3964: " format "\n" , ## args)
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#ifdef DEBUG_MODUL
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#define TRACE_M(format, args...) printk("r3964: " format "\n" , ## args)
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#else
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#define TRACE_M(fmt, arg...) do {} while (0)
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#endif
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#ifdef DEBUG_PROTO_S
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#define TRACE_PS(format, args...) printk("r3964: " format "\n" , ## args)
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#else
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#define TRACE_PS(fmt, arg...) do {} while (0)
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#endif
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#ifdef DEBUG_PROTO_E
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#define TRACE_PE(format, args...) printk("r3964: " format "\n" , ## args)
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#else
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#define TRACE_PE(fmt, arg...) do {} while (0)
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#endif
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#ifdef DEBUG_LDISC
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#define TRACE_L(format, args...) printk("r3964: " format "\n" , ## args)
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#else
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#define TRACE_L(fmt, arg...) do {} while (0)
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#endif
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#ifdef DEBUG_QUEUE
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#define TRACE_Q(format, args...) printk("r3964: " format "\n" , ## args)
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#else
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#define TRACE_Q(fmt, arg...) do {} while (0)
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#endif
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static void add_tx_queue(struct r3964_info *, struct r3964_block_header *);
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static void remove_from_tx_queue(struct r3964_info *pInfo, int error_code);
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static void put_char(struct r3964_info *pInfo, unsigned char ch);
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static void trigger_transmit(struct r3964_info *pInfo);
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static void retry_transmit(struct r3964_info *pInfo);
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static void transmit_block(struct r3964_info *pInfo);
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static void receive_char(struct r3964_info *pInfo, const unsigned char c);
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static void receive_error(struct r3964_info *pInfo, const char flag);
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static void on_timeout(unsigned long priv);
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static int enable_signals(struct r3964_info *pInfo, struct pid *pid, int arg);
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static int read_telegram(struct r3964_info *pInfo, struct pid *pid,
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unsigned char __user * buf);
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static void add_msg(struct r3964_client_info *pClient, int msg_id, int arg,
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int error_code, struct r3964_block_header *pBlock);
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static struct r3964_message *remove_msg(struct r3964_info *pInfo,
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struct r3964_client_info *pClient);
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static void remove_client_block(struct r3964_info *pInfo,
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struct r3964_client_info *pClient);
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static int r3964_open(struct tty_struct *tty);
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static void r3964_close(struct tty_struct *tty);
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static ssize_t r3964_read(struct tty_struct *tty, struct file *file,
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unsigned char __user * buf, size_t nr);
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static ssize_t r3964_write(struct tty_struct *tty, struct file *file,
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const unsigned char *buf, size_t nr);
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static int r3964_ioctl(struct tty_struct *tty, struct file *file,
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unsigned int cmd, unsigned long arg);
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static void r3964_set_termios(struct tty_struct *tty, struct ktermios *old);
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static unsigned int r3964_poll(struct tty_struct *tty, struct file *file,
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struct poll_table_struct *wait);
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static void r3964_receive_buf(struct tty_struct *tty, const unsigned char *cp,
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char *fp, int count);
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static struct tty_ldisc tty_ldisc_N_R3964 = {
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.owner = THIS_MODULE,
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.magic = TTY_LDISC_MAGIC,
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.name = "R3964",
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.open = r3964_open,
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.close = r3964_close,
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.read = r3964_read,
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.write = r3964_write,
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.ioctl = r3964_ioctl,
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.set_termios = r3964_set_termios,
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.poll = r3964_poll,
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.receive_buf = r3964_receive_buf,
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};
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static void dump_block(const unsigned char *block, unsigned int length)
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{
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unsigned int i, j;
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char linebuf[16 * 3 + 1];
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for (i = 0; i < length; i += 16) {
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for (j = 0; (j < 16) && (j + i < length); j++) {
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sprintf(linebuf + 3 * j, "%02x ", block[i + j]);
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}
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linebuf[3 * j] = '\0';
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TRACE_PS("%s", linebuf);
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}
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}
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/*************************************************************
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* Driver initialisation
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*************************************************************/
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/*************************************************************
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* Module support routines
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*************************************************************/
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static void __exit r3964_exit(void)
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{
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int status;
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TRACE_M("cleanup_module()");
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status = tty_unregister_ldisc(N_R3964);
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if (status != 0) {
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printk(KERN_ERR "r3964: error unregistering linediscipline: "
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"%d\n", status);
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} else {
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TRACE_L("linediscipline successfully unregistered");
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}
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}
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static int __init r3964_init(void)
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{
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int status;
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printk("r3964: Philips r3964 Driver $Revision: 1.10 $\n");
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/*
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* Register the tty line discipline
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*/
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status = tty_register_ldisc(N_R3964, &tty_ldisc_N_R3964);
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if (status == 0) {
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TRACE_L("line discipline %d registered", N_R3964);
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TRACE_L("flags=%x num=%x", tty_ldisc_N_R3964.flags,
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tty_ldisc_N_R3964.num);
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TRACE_L("open=%p", tty_ldisc_N_R3964.open);
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TRACE_L("tty_ldisc_N_R3964 = %p", &tty_ldisc_N_R3964);
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} else {
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printk(KERN_ERR "r3964: error registering line discipline: "
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"%d\n", status);
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}
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return status;
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}
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module_init(r3964_init);
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module_exit(r3964_exit);
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/*************************************************************
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* Protocol implementation routines
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*************************************************************/
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static void add_tx_queue(struct r3964_info *pInfo,
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struct r3964_block_header *pHeader)
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{
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unsigned long flags;
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spin_lock_irqsave(&pInfo->lock, flags);
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pHeader->next = NULL;
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if (pInfo->tx_last == NULL) {
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pInfo->tx_first = pInfo->tx_last = pHeader;
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} else {
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pInfo->tx_last->next = pHeader;
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pInfo->tx_last = pHeader;
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}
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spin_unlock_irqrestore(&pInfo->lock, flags);
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| 247 |
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TRACE_Q("add_tx_queue %p, length %d, tx_first = %p",
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pHeader, pHeader->length, pInfo->tx_first);
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}
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| 250 |
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| 251 |
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static void remove_from_tx_queue(struct r3964_info *pInfo, int error_code)
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| 252 |
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{
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| 253 |
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struct r3964_block_header *pHeader;
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| 254 |
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unsigned long flags;
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| 255 |
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#ifdef DEBUG_QUEUE
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| 256 |
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struct r3964_block_header *pDump;
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#endif
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| 258 |
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| 259 |
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pHeader = pInfo->tx_first;
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| 261 |
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if (pHeader == NULL)
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return;
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| 263 |
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| 264 |
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#ifdef DEBUG_QUEUE
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| 265 |
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printk("r3964: remove_from_tx_queue: %p, length %u - ",
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| 266 |
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pHeader, pHeader->length);
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| 267 |
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for (pDump = pHeader; pDump; pDump = pDump->next)
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| 268 |
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printk("%p ", pDump);
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printk("\n");
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| 270 |
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#endif
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| 271 |
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| 272 |
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if (pHeader->owner) {
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| 273 |
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if (error_code) {
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add_msg(pHeader->owner, R3964_MSG_ACK, 0,
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error_code, NULL);
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| 276 |
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} else {
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| 277 |
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add_msg(pHeader->owner, R3964_MSG_ACK, pHeader->length,
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| 278 |
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error_code, NULL);
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| 279 |
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}
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| 280 |
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wake_up_interruptible(&pInfo->read_wait);
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| 281 |
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}
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| 282 |
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| 283 |
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spin_lock_irqsave(&pInfo->lock, flags);
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| 284 |
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| 285 |
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pInfo->tx_first = pHeader->next;
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| 286 |
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if (pInfo->tx_first == NULL) {
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| 287 |
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pInfo->tx_last = NULL;
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| 288 |
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}
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| 289 |
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| 290 |
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spin_unlock_irqrestore(&pInfo->lock, flags);
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| 291 |
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| 292 |
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kfree(pHeader);
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| 293 |
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TRACE_M("remove_from_tx_queue - kfree %p", pHeader);
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| 294 |
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| 295 |
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TRACE_Q("remove_from_tx_queue: tx_first = %p, tx_last = %p",
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| 296 |
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pInfo->tx_first, pInfo->tx_last);
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| 297 |
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}
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| 298 |
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| 299 |
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static void add_rx_queue(struct r3964_info *pInfo,
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| 300 |
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struct r3964_block_header *pHeader)
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| 301 |
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{
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| 302 |
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unsigned long flags;
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| 303 |
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| 304 |
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spin_lock_irqsave(&pInfo->lock, flags);
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| 305 |
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| 306 |
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pHeader->next = NULL;
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| 307 |
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| 308 |
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if (pInfo->rx_last == NULL) {
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| 309 |
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pInfo->rx_first = pInfo->rx_last = pHeader;
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| 310 |
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} else {
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| 311 |
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pInfo->rx_last->next = pHeader;
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| 312 |
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pInfo->rx_last = pHeader;
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| 313 |
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}
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| 314 |
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pInfo->blocks_in_rx_queue++;
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| 315 |
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| 316 |
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spin_unlock_irqrestore(&pInfo->lock, flags);
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| 317 |
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| 318 |
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TRACE_Q("add_rx_queue: %p, length = %d, rx_first = %p, count = %d",
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| 319 |
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pHeader, pHeader->length,
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| 320 |
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pInfo->rx_first, pInfo->blocks_in_rx_queue);
|
| 321 |
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}
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| 322 |
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| 323 |
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static void remove_from_rx_queue(struct r3964_info *pInfo,
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| 324 |
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struct r3964_block_header *pHeader)
|
| 325 |
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{
|
| 326 |
|
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unsigned long flags;
|
| 327 |
|
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struct r3964_block_header *pFind;
|
| 328 |
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|
| 329 |
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if (pHeader == NULL)
|
| 330 |
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return;
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| 331 |
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| 332 |
|
|
TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d",
|
| 333 |
|
|
pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue);
|
| 334 |
|
|
TRACE_Q("remove_from_rx_queue: %p, length %u",
|
| 335 |
|
|
pHeader, pHeader->length);
|
| 336 |
|
|
|
| 337 |
|
|
spin_lock_irqsave(&pInfo->lock, flags);
|
| 338 |
|
|
|
| 339 |
|
|
if (pInfo->rx_first == pHeader) {
|
| 340 |
|
|
/* Remove the first block in the linked list: */
|
| 341 |
|
|
pInfo->rx_first = pHeader->next;
|
| 342 |
|
|
|
| 343 |
|
|
if (pInfo->rx_first == NULL) {
|
| 344 |
|
|
pInfo->rx_last = NULL;
|
| 345 |
|
|
}
|
| 346 |
|
|
pInfo->blocks_in_rx_queue--;
|
| 347 |
|
|
} else {
|
| 348 |
|
|
/* Find block to remove: */
|
| 349 |
|
|
for (pFind = pInfo->rx_first; pFind; pFind = pFind->next) {
|
| 350 |
|
|
if (pFind->next == pHeader) {
|
| 351 |
|
|
/* Got it. */
|
| 352 |
|
|
pFind->next = pHeader->next;
|
| 353 |
|
|
pInfo->blocks_in_rx_queue--;
|
| 354 |
|
|
if (pFind->next == NULL) {
|
| 355 |
|
|
/* Oh, removed the last one! */
|
| 356 |
|
|
pInfo->rx_last = pFind;
|
| 357 |
|
|
}
|
| 358 |
|
|
break;
|
| 359 |
|
|
}
|
| 360 |
|
|
}
|
| 361 |
|
|
}
|
| 362 |
|
|
|
| 363 |
|
|
spin_unlock_irqrestore(&pInfo->lock, flags);
|
| 364 |
|
|
|
| 365 |
|
|
kfree(pHeader);
|
| 366 |
|
|
TRACE_M("remove_from_rx_queue - kfree %p", pHeader);
|
| 367 |
|
|
|
| 368 |
|
|
TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d",
|
| 369 |
|
|
pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue);
|
| 370 |
|
|
}
|
| 371 |
|
|
|
| 372 |
|
|
static void put_char(struct r3964_info *pInfo, unsigned char ch)
|
| 373 |
|
|
{
|
| 374 |
|
|
struct tty_struct *tty = pInfo->tty;
|
| 375 |
|
|
|
| 376 |
|
|
if (tty == NULL)
|
| 377 |
|
|
return;
|
| 378 |
|
|
|
| 379 |
|
|
if (tty->driver->put_char) {
|
| 380 |
|
|
tty->driver->put_char(tty, ch);
|
| 381 |
|
|
}
|
| 382 |
|
|
pInfo->bcc ^= ch;
|
| 383 |
|
|
}
|
| 384 |
|
|
|
| 385 |
|
|
static void flush(struct r3964_info *pInfo)
|
| 386 |
|
|
{
|
| 387 |
|
|
struct tty_struct *tty = pInfo->tty;
|
| 388 |
|
|
|
| 389 |
|
|
if (tty == NULL)
|
| 390 |
|
|
return;
|
| 391 |
|
|
|
| 392 |
|
|
if (tty->driver->flush_chars) {
|
| 393 |
|
|
tty->driver->flush_chars(tty);
|
| 394 |
|
|
}
|
| 395 |
|
|
}
|
| 396 |
|
|
|
| 397 |
|
|
static void trigger_transmit(struct r3964_info *pInfo)
|
| 398 |
|
|
{
|
| 399 |
|
|
unsigned long flags;
|
| 400 |
|
|
|
| 401 |
|
|
spin_lock_irqsave(&pInfo->lock, flags);
|
| 402 |
|
|
|
| 403 |
|
|
if ((pInfo->state == R3964_IDLE) && (pInfo->tx_first != NULL)) {
|
| 404 |
|
|
pInfo->state = R3964_TX_REQUEST;
|
| 405 |
|
|
pInfo->nRetry = 0;
|
| 406 |
|
|
pInfo->flags &= ~R3964_ERROR;
|
| 407 |
|
|
mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
|
| 408 |
|
|
|
| 409 |
|
|
spin_unlock_irqrestore(&pInfo->lock, flags);
|
| 410 |
|
|
|
| 411 |
|
|
TRACE_PS("trigger_transmit - sent STX");
|
| 412 |
|
|
|
| 413 |
|
|
put_char(pInfo, STX);
|
| 414 |
|
|
flush(pInfo);
|
| 415 |
|
|
|
| 416 |
|
|
pInfo->bcc = 0;
|
| 417 |
|
|
} else {
|
| 418 |
|
|
spin_unlock_irqrestore(&pInfo->lock, flags);
|
| 419 |
|
|
}
|
| 420 |
|
|
}
|
| 421 |
|
|
|
| 422 |
|
|
static void retry_transmit(struct r3964_info *pInfo)
|
| 423 |
|
|
{
|
| 424 |
|
|
if (pInfo->nRetry < R3964_MAX_RETRIES) {
|
| 425 |
|
|
TRACE_PE("transmission failed. Retry #%d", pInfo->nRetry);
|
| 426 |
|
|
pInfo->bcc = 0;
|
| 427 |
|
|
put_char(pInfo, STX);
|
| 428 |
|
|
flush(pInfo);
|
| 429 |
|
|
pInfo->state = R3964_TX_REQUEST;
|
| 430 |
|
|
pInfo->nRetry++;
|
| 431 |
|
|
mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
|
| 432 |
|
|
} else {
|
| 433 |
|
|
TRACE_PE("transmission failed after %d retries",
|
| 434 |
|
|
R3964_MAX_RETRIES);
|
| 435 |
|
|
|
| 436 |
|
|
remove_from_tx_queue(pInfo, R3964_TX_FAIL);
|
| 437 |
|
|
|
| 438 |
|
|
put_char(pInfo, NAK);
|
| 439 |
|
|
flush(pInfo);
|
| 440 |
|
|
pInfo->state = R3964_IDLE;
|
| 441 |
|
|
|
| 442 |
|
|
trigger_transmit(pInfo);
|
| 443 |
|
|
}
|
| 444 |
|
|
}
|
| 445 |
|
|
|
| 446 |
|
|
static void transmit_block(struct r3964_info *pInfo)
|
| 447 |
|
|
{
|
| 448 |
|
|
struct tty_struct *tty = pInfo->tty;
|
| 449 |
|
|
struct r3964_block_header *pBlock = pInfo->tx_first;
|
| 450 |
|
|
int room = 0;
|
| 451 |
|
|
|
| 452 |
|
|
if ((tty == NULL) || (pBlock == NULL)) {
|
| 453 |
|
|
return;
|
| 454 |
|
|
}
|
| 455 |
|
|
|
| 456 |
|
|
if (tty->driver->write_room)
|
| 457 |
|
|
room = tty->driver->write_room(tty);
|
| 458 |
|
|
|
| 459 |
|
|
TRACE_PS("transmit_block %p, room %d, length %d",
|
| 460 |
|
|
pBlock, room, pBlock->length);
|
| 461 |
|
|
|
| 462 |
|
|
while (pInfo->tx_position < pBlock->length) {
|
| 463 |
|
|
if (room < 2)
|
| 464 |
|
|
break;
|
| 465 |
|
|
|
| 466 |
|
|
if (pBlock->data[pInfo->tx_position] == DLE) {
|
| 467 |
|
|
/* send additional DLE char: */
|
| 468 |
|
|
put_char(pInfo, DLE);
|
| 469 |
|
|
}
|
| 470 |
|
|
put_char(pInfo, pBlock->data[pInfo->tx_position++]);
|
| 471 |
|
|
|
| 472 |
|
|
room--;
|
| 473 |
|
|
}
|
| 474 |
|
|
|
| 475 |
|
|
if ((pInfo->tx_position == pBlock->length) && (room >= 3)) {
|
| 476 |
|
|
put_char(pInfo, DLE);
|
| 477 |
|
|
put_char(pInfo, ETX);
|
| 478 |
|
|
if (pInfo->flags & R3964_BCC) {
|
| 479 |
|
|
put_char(pInfo, pInfo->bcc);
|
| 480 |
|
|
}
|
| 481 |
|
|
pInfo->state = R3964_WAIT_FOR_TX_ACK;
|
| 482 |
|
|
mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
|
| 483 |
|
|
}
|
| 484 |
|
|
flush(pInfo);
|
| 485 |
|
|
}
|
| 486 |
|
|
|
| 487 |
|
|
static void on_receive_block(struct r3964_info *pInfo)
|
| 488 |
|
|
{
|
| 489 |
|
|
unsigned int length;
|
| 490 |
|
|
struct r3964_client_info *pClient;
|
| 491 |
|
|
struct r3964_block_header *pBlock;
|
| 492 |
|
|
|
| 493 |
|
|
length = pInfo->rx_position;
|
| 494 |
|
|
|
| 495 |
|
|
/* compare byte checksum characters: */
|
| 496 |
|
|
if (pInfo->flags & R3964_BCC) {
|
| 497 |
|
|
if (pInfo->bcc != pInfo->last_rx) {
|
| 498 |
|
|
TRACE_PE("checksum error - got %x but expected %x",
|
| 499 |
|
|
pInfo->last_rx, pInfo->bcc);
|
| 500 |
|
|
pInfo->flags |= R3964_CHECKSUM;
|
| 501 |
|
|
}
|
| 502 |
|
|
}
|
| 503 |
|
|
|
| 504 |
|
|
/* check for errors (parity, overrun,...): */
|
| 505 |
|
|
if (pInfo->flags & R3964_ERROR) {
|
| 506 |
|
|
TRACE_PE("on_receive_block - transmission failed error %x",
|
| 507 |
|
|
pInfo->flags & R3964_ERROR);
|
| 508 |
|
|
|
| 509 |
|
|
put_char(pInfo, NAK);
|
| 510 |
|
|
flush(pInfo);
|
| 511 |
|
|
if (pInfo->nRetry < R3964_MAX_RETRIES) {
|
| 512 |
|
|
pInfo->state = R3964_WAIT_FOR_RX_REPEAT;
|
| 513 |
|
|
pInfo->nRetry++;
|
| 514 |
|
|
mod_timer(&pInfo->tmr, jiffies + R3964_TO_RX_PANIC);
|
| 515 |
|
|
} else {
|
| 516 |
|
|
TRACE_PE("on_receive_block - failed after max retries");
|
| 517 |
|
|
pInfo->state = R3964_IDLE;
|
| 518 |
|
|
}
|
| 519 |
|
|
return;
|
| 520 |
|
|
}
|
| 521 |
|
|
|
| 522 |
|
|
/* received block; submit DLE: */
|
| 523 |
|
|
put_char(pInfo, DLE);
|
| 524 |
|
|
flush(pInfo);
|
| 525 |
|
|
del_timer_sync(&pInfo->tmr);
|
| 526 |
|
|
TRACE_PS(" rx success: got %d chars", length);
|
| 527 |
|
|
|
| 528 |
|
|
/* prepare struct r3964_block_header: */
|
| 529 |
|
|
pBlock = kmalloc(length + sizeof(struct r3964_block_header),
|
| 530 |
|
|
GFP_KERNEL);
|
| 531 |
|
|
TRACE_M("on_receive_block - kmalloc %p", pBlock);
|
| 532 |
|
|
|
| 533 |
|
|
if (pBlock == NULL)
|
| 534 |
|
|
return;
|
| 535 |
|
|
|
| 536 |
|
|
pBlock->length = length;
|
| 537 |
|
|
pBlock->data = ((unsigned char *)pBlock) +
|
| 538 |
|
|
sizeof(struct r3964_block_header);
|
| 539 |
|
|
pBlock->locks = 0;
|
| 540 |
|
|
pBlock->next = NULL;
|
| 541 |
|
|
pBlock->owner = NULL;
|
| 542 |
|
|
|
| 543 |
|
|
memcpy(pBlock->data, pInfo->rx_buf, length);
|
| 544 |
|
|
|
| 545 |
|
|
/* queue block into rx_queue: */
|
| 546 |
|
|
add_rx_queue(pInfo, pBlock);
|
| 547 |
|
|
|
| 548 |
|
|
/* notify attached client processes: */
|
| 549 |
|
|
for (pClient = pInfo->firstClient; pClient; pClient = pClient->next) {
|
| 550 |
|
|
if (pClient->sig_flags & R3964_SIG_DATA) {
|
| 551 |
|
|
add_msg(pClient, R3964_MSG_DATA, length, R3964_OK,
|
| 552 |
|
|
pBlock);
|
| 553 |
|
|
}
|
| 554 |
|
|
}
|
| 555 |
|
|
wake_up_interruptible(&pInfo->read_wait);
|
| 556 |
|
|
|
| 557 |
|
|
pInfo->state = R3964_IDLE;
|
| 558 |
|
|
|
| 559 |
|
|
trigger_transmit(pInfo);
|
| 560 |
|
|
}
|
| 561 |
|
|
|
| 562 |
|
|
static void receive_char(struct r3964_info *pInfo, const unsigned char c)
|
| 563 |
|
|
{
|
| 564 |
|
|
switch (pInfo->state) {
|
| 565 |
|
|
case R3964_TX_REQUEST:
|
| 566 |
|
|
if (c == DLE) {
|
| 567 |
|
|
TRACE_PS("TX_REQUEST - got DLE");
|
| 568 |
|
|
|
| 569 |
|
|
pInfo->state = R3964_TRANSMITTING;
|
| 570 |
|
|
pInfo->tx_position = 0;
|
| 571 |
|
|
|
| 572 |
|
|
transmit_block(pInfo);
|
| 573 |
|
|
} else if (c == STX) {
|
| 574 |
|
|
if (pInfo->nRetry == 0) {
|
| 575 |
|
|
TRACE_PE("TX_REQUEST - init conflict");
|
| 576 |
|
|
if (pInfo->priority == R3964_SLAVE) {
|
| 577 |
|
|
goto start_receiving;
|
| 578 |
|
|
}
|
| 579 |
|
|
} else {
|
| 580 |
|
|
TRACE_PE("TX_REQUEST - secondary init "
|
| 581 |
|
|
"conflict!? Switching to SLAVE mode "
|
| 582 |
|
|
"for next rx.");
|
| 583 |
|
|
goto start_receiving;
|
| 584 |
|
|
}
|
| 585 |
|
|
} else {
|
| 586 |
|
|
TRACE_PE("TX_REQUEST - char != DLE: %x", c);
|
| 587 |
|
|
retry_transmit(pInfo);
|
| 588 |
|
|
}
|
| 589 |
|
|
break;
|
| 590 |
|
|
case R3964_TRANSMITTING:
|
| 591 |
|
|
if (c == NAK) {
|
| 592 |
|
|
TRACE_PE("TRANSMITTING - got NAK");
|
| 593 |
|
|
retry_transmit(pInfo);
|
| 594 |
|
|
} else {
|
| 595 |
|
|
TRACE_PE("TRANSMITTING - got invalid char");
|
| 596 |
|
|
|
| 597 |
|
|
pInfo->state = R3964_WAIT_ZVZ_BEFORE_TX_RETRY;
|
| 598 |
|
|
mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
|
| 599 |
|
|
}
|
| 600 |
|
|
break;
|
| 601 |
|
|
case R3964_WAIT_FOR_TX_ACK:
|
| 602 |
|
|
if (c == DLE) {
|
| 603 |
|
|
TRACE_PS("WAIT_FOR_TX_ACK - got DLE");
|
| 604 |
|
|
remove_from_tx_queue(pInfo, R3964_OK);
|
| 605 |
|
|
|
| 606 |
|
|
pInfo->state = R3964_IDLE;
|
| 607 |
|
|
trigger_transmit(pInfo);
|
| 608 |
|
|
} else {
|
| 609 |
|
|
retry_transmit(pInfo);
|
| 610 |
|
|
}
|
| 611 |
|
|
break;
|
| 612 |
|
|
case R3964_WAIT_FOR_RX_REPEAT:
|
| 613 |
|
|
/* FALLTROUGH */
|
| 614 |
|
|
case R3964_IDLE:
|
| 615 |
|
|
if (c == STX) {
|
| 616 |
|
|
/* Prevent rx_queue from overflow: */
|
| 617 |
|
|
if (pInfo->blocks_in_rx_queue >=
|
| 618 |
|
|
R3964_MAX_BLOCKS_IN_RX_QUEUE) {
|
| 619 |
|
|
TRACE_PE("IDLE - got STX but no space in "
|
| 620 |
|
|
"rx_queue!");
|
| 621 |
|
|
pInfo->state = R3964_WAIT_FOR_RX_BUF;
|
| 622 |
|
|
mod_timer(&pInfo->tmr,
|
| 623 |
|
|
jiffies + R3964_TO_NO_BUF);
|
| 624 |
|
|
break;
|
| 625 |
|
|
}
|
| 626 |
|
|
start_receiving:
|
| 627 |
|
|
/* Ok, start receiving: */
|
| 628 |
|
|
TRACE_PS("IDLE - got STX");
|
| 629 |
|
|
pInfo->rx_position = 0;
|
| 630 |
|
|
pInfo->last_rx = 0;
|
| 631 |
|
|
pInfo->flags &= ~R3964_ERROR;
|
| 632 |
|
|
pInfo->state = R3964_RECEIVING;
|
| 633 |
|
|
mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
|
| 634 |
|
|
pInfo->nRetry = 0;
|
| 635 |
|
|
put_char(pInfo, DLE);
|
| 636 |
|
|
flush(pInfo);
|
| 637 |
|
|
pInfo->bcc = 0;
|
| 638 |
|
|
}
|
| 639 |
|
|
break;
|
| 640 |
|
|
case R3964_RECEIVING:
|
| 641 |
|
|
if (pInfo->rx_position < RX_BUF_SIZE) {
|
| 642 |
|
|
pInfo->bcc ^= c;
|
| 643 |
|
|
|
| 644 |
|
|
if (c == DLE) {
|
| 645 |
|
|
if (pInfo->last_rx == DLE) {
|
| 646 |
|
|
pInfo->last_rx = 0;
|
| 647 |
|
|
goto char_to_buf;
|
| 648 |
|
|
}
|
| 649 |
|
|
pInfo->last_rx = DLE;
|
| 650 |
|
|
break;
|
| 651 |
|
|
} else if ((c == ETX) && (pInfo->last_rx == DLE)) {
|
| 652 |
|
|
if (pInfo->flags & R3964_BCC) {
|
| 653 |
|
|
pInfo->state = R3964_WAIT_FOR_BCC;
|
| 654 |
|
|
mod_timer(&pInfo->tmr,
|
| 655 |
|
|
jiffies + R3964_TO_ZVZ);
|
| 656 |
|
|
} else {
|
| 657 |
|
|
on_receive_block(pInfo);
|
| 658 |
|
|
}
|
| 659 |
|
|
} else {
|
| 660 |
|
|
pInfo->last_rx = c;
|
| 661 |
|
|
char_to_buf:
|
| 662 |
|
|
pInfo->rx_buf[pInfo->rx_position++] = c;
|
| 663 |
|
|
mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
|
| 664 |
|
|
}
|
| 665 |
|
|
}
|
| 666 |
|
|
/* else: overflow-msg? BUF_SIZE>MTU; should not happen? */
|
| 667 |
|
|
break;
|
| 668 |
|
|
case R3964_WAIT_FOR_BCC:
|
| 669 |
|
|
pInfo->last_rx = c;
|
| 670 |
|
|
on_receive_block(pInfo);
|
| 671 |
|
|
break;
|
| 672 |
|
|
}
|
| 673 |
|
|
}
|
| 674 |
|
|
|
| 675 |
|
|
static void receive_error(struct r3964_info *pInfo, const char flag)
|
| 676 |
|
|
{
|
| 677 |
|
|
switch (flag) {
|
| 678 |
|
|
case TTY_NORMAL:
|
| 679 |
|
|
break;
|
| 680 |
|
|
case TTY_BREAK:
|
| 681 |
|
|
TRACE_PE("received break");
|
| 682 |
|
|
pInfo->flags |= R3964_BREAK;
|
| 683 |
|
|
break;
|
| 684 |
|
|
case TTY_PARITY:
|
| 685 |
|
|
TRACE_PE("parity error");
|
| 686 |
|
|
pInfo->flags |= R3964_PARITY;
|
| 687 |
|
|
break;
|
| 688 |
|
|
case TTY_FRAME:
|
| 689 |
|
|
TRACE_PE("frame error");
|
| 690 |
|
|
pInfo->flags |= R3964_FRAME;
|
| 691 |
|
|
break;
|
| 692 |
|
|
case TTY_OVERRUN:
|
| 693 |
|
|
TRACE_PE("frame overrun");
|
| 694 |
|
|
pInfo->flags |= R3964_OVERRUN;
|
| 695 |
|
|
break;
|
| 696 |
|
|
default:
|
| 697 |
|
|
TRACE_PE("receive_error - unknown flag %d", flag);
|
| 698 |
|
|
pInfo->flags |= R3964_UNKNOWN;
|
| 699 |
|
|
break;
|
| 700 |
|
|
}
|
| 701 |
|
|
}
|
| 702 |
|
|
|
| 703 |
|
|
static void on_timeout(unsigned long priv)
|
| 704 |
|
|
{
|
| 705 |
|
|
struct r3964_info *pInfo = (void *)priv;
|
| 706 |
|
|
|
| 707 |
|
|
switch (pInfo->state) {
|
| 708 |
|
|
case R3964_TX_REQUEST:
|
| 709 |
|
|
TRACE_PE("TX_REQUEST - timeout");
|
| 710 |
|
|
retry_transmit(pInfo);
|
| 711 |
|
|
break;
|
| 712 |
|
|
case R3964_WAIT_ZVZ_BEFORE_TX_RETRY:
|
| 713 |
|
|
put_char(pInfo, NAK);
|
| 714 |
|
|
flush(pInfo);
|
| 715 |
|
|
retry_transmit(pInfo);
|
| 716 |
|
|
break;
|
| 717 |
|
|
case R3964_WAIT_FOR_TX_ACK:
|
| 718 |
|
|
TRACE_PE("WAIT_FOR_TX_ACK - timeout");
|
| 719 |
|
|
retry_transmit(pInfo);
|
| 720 |
|
|
break;
|
| 721 |
|
|
case R3964_WAIT_FOR_RX_BUF:
|
| 722 |
|
|
TRACE_PE("WAIT_FOR_RX_BUF - timeout");
|
| 723 |
|
|
put_char(pInfo, NAK);
|
| 724 |
|
|
flush(pInfo);
|
| 725 |
|
|
pInfo->state = R3964_IDLE;
|
| 726 |
|
|
break;
|
| 727 |
|
|
case R3964_RECEIVING:
|
| 728 |
|
|
TRACE_PE("RECEIVING - timeout after %d chars",
|
| 729 |
|
|
pInfo->rx_position);
|
| 730 |
|
|
put_char(pInfo, NAK);
|
| 731 |
|
|
flush(pInfo);
|
| 732 |
|
|
pInfo->state = R3964_IDLE;
|
| 733 |
|
|
break;
|
| 734 |
|
|
case R3964_WAIT_FOR_RX_REPEAT:
|
| 735 |
|
|
TRACE_PE("WAIT_FOR_RX_REPEAT - timeout");
|
| 736 |
|
|
pInfo->state = R3964_IDLE;
|
| 737 |
|
|
break;
|
| 738 |
|
|
case R3964_WAIT_FOR_BCC:
|
| 739 |
|
|
TRACE_PE("WAIT_FOR_BCC - timeout");
|
| 740 |
|
|
put_char(pInfo, NAK);
|
| 741 |
|
|
flush(pInfo);
|
| 742 |
|
|
pInfo->state = R3964_IDLE;
|
| 743 |
|
|
break;
|
| 744 |
|
|
}
|
| 745 |
|
|
}
|
| 746 |
|
|
|
| 747 |
|
|
static struct r3964_client_info *findClient(struct r3964_info *pInfo,
|
| 748 |
|
|
struct pid *pid)
|
| 749 |
|
|
{
|
| 750 |
|
|
struct r3964_client_info *pClient;
|
| 751 |
|
|
|
| 752 |
|
|
for (pClient = pInfo->firstClient; pClient; pClient = pClient->next) {
|
| 753 |
|
|
if (pClient->pid == pid) {
|
| 754 |
|
|
return pClient;
|
| 755 |
|
|
}
|
| 756 |
|
|
}
|
| 757 |
|
|
return NULL;
|
| 758 |
|
|
}
|
| 759 |
|
|
|
| 760 |
|
|
static int enable_signals(struct r3964_info *pInfo, struct pid *pid, int arg)
|
| 761 |
|
|
{
|
| 762 |
|
|
struct r3964_client_info *pClient;
|
| 763 |
|
|
struct r3964_client_info **ppClient;
|
| 764 |
|
|
struct r3964_message *pMsg;
|
| 765 |
|
|
|
| 766 |
|
|
if ((arg & R3964_SIG_ALL) == 0) {
|
| 767 |
|
|
/* Remove client from client list */
|
| 768 |
|
|
for (ppClient = &pInfo->firstClient; *ppClient;
|
| 769 |
|
|
ppClient = &(*ppClient)->next) {
|
| 770 |
|
|
pClient = *ppClient;
|
| 771 |
|
|
|
| 772 |
|
|
if (pClient->pid == pid) {
|
| 773 |
|
|
TRACE_PS("removing client %d from client list",
|
| 774 |
|
|
pid_nr(pid));
|
| 775 |
|
|
*ppClient = pClient->next;
|
| 776 |
|
|
while (pClient->msg_count) {
|
| 777 |
|
|
pMsg = remove_msg(pInfo, pClient);
|
| 778 |
|
|
if (pMsg) {
|
| 779 |
|
|
kfree(pMsg);
|
| 780 |
|
|
TRACE_M("enable_signals - msg "
|
| 781 |
|
|
"kfree %p", pMsg);
|
| 782 |
|
|
}
|
| 783 |
|
|
}
|
| 784 |
|
|
put_pid(pClient->pid);
|
| 785 |
|
|
kfree(pClient);
|
| 786 |
|
|
TRACE_M("enable_signals - kfree %p", pClient);
|
| 787 |
|
|
return 0;
|
| 788 |
|
|
}
|
| 789 |
|
|
}
|
| 790 |
|
|
return -EINVAL;
|
| 791 |
|
|
} else {
|
| 792 |
|
|
pClient = findClient(pInfo, pid);
|
| 793 |
|
|
if (pClient) {
|
| 794 |
|
|
/* update signal options */
|
| 795 |
|
|
pClient->sig_flags = arg;
|
| 796 |
|
|
} else {
|
| 797 |
|
|
/* add client to client list */
|
| 798 |
|
|
pClient = kmalloc(sizeof(struct r3964_client_info),
|
| 799 |
|
|
GFP_KERNEL);
|
| 800 |
|
|
TRACE_M("enable_signals - kmalloc %p", pClient);
|
| 801 |
|
|
if (pClient == NULL)
|
| 802 |
|
|
return -ENOMEM;
|
| 803 |
|
|
|
| 804 |
|
|
TRACE_PS("add client %d to client list", pid_nr(pid));
|
| 805 |
|
|
spin_lock_init(&pClient->lock);
|
| 806 |
|
|
pClient->sig_flags = arg;
|
| 807 |
|
|
pClient->pid = get_pid(pid);
|
| 808 |
|
|
pClient->next = pInfo->firstClient;
|
| 809 |
|
|
pClient->first_msg = NULL;
|
| 810 |
|
|
pClient->last_msg = NULL;
|
| 811 |
|
|
pClient->next_block_to_read = NULL;
|
| 812 |
|
|
pClient->msg_count = 0;
|
| 813 |
|
|
pInfo->firstClient = pClient;
|
| 814 |
|
|
}
|
| 815 |
|
|
}
|
| 816 |
|
|
|
| 817 |
|
|
return 0;
|
| 818 |
|
|
}
|
| 819 |
|
|
|
| 820 |
|
|
static int read_telegram(struct r3964_info *pInfo, struct pid *pid,
|
| 821 |
|
|
unsigned char __user * buf)
|
| 822 |
|
|
{
|
| 823 |
|
|
struct r3964_client_info *pClient;
|
| 824 |
|
|
struct r3964_block_header *block;
|
| 825 |
|
|
|
| 826 |
|
|
if (!buf) {
|
| 827 |
|
|
return -EINVAL;
|
| 828 |
|
|
}
|
| 829 |
|
|
|
| 830 |
|
|
pClient = findClient(pInfo, pid);
|
| 831 |
|
|
if (pClient == NULL) {
|
| 832 |
|
|
return -EINVAL;
|
| 833 |
|
|
}
|
| 834 |
|
|
|
| 835 |
|
|
block = pClient->next_block_to_read;
|
| 836 |
|
|
if (!block) {
|
| 837 |
|
|
return 0;
|
| 838 |
|
|
} else {
|
| 839 |
|
|
if (copy_to_user(buf, block->data, block->length))
|
| 840 |
|
|
return -EFAULT;
|
| 841 |
|
|
|
| 842 |
|
|
remove_client_block(pInfo, pClient);
|
| 843 |
|
|
return block->length;
|
| 844 |
|
|
}
|
| 845 |
|
|
|
| 846 |
|
|
return -EINVAL;
|
| 847 |
|
|
}
|
| 848 |
|
|
|
| 849 |
|
|
static void add_msg(struct r3964_client_info *pClient, int msg_id, int arg,
|
| 850 |
|
|
int error_code, struct r3964_block_header *pBlock)
|
| 851 |
|
|
{
|
| 852 |
|
|
struct r3964_message *pMsg;
|
| 853 |
|
|
unsigned long flags;
|
| 854 |
|
|
|
| 855 |
|
|
if (pClient->msg_count < R3964_MAX_MSG_COUNT - 1) {
|
| 856 |
|
|
queue_the_message:
|
| 857 |
|
|
|
| 858 |
|
|
pMsg = kmalloc(sizeof(struct r3964_message),
|
| 859 |
|
|
error_code ? GFP_ATOMIC : GFP_KERNEL);
|
| 860 |
|
|
TRACE_M("add_msg - kmalloc %p", pMsg);
|
| 861 |
|
|
if (pMsg == NULL) {
|
| 862 |
|
|
return;
|
| 863 |
|
|
}
|
| 864 |
|
|
|
| 865 |
|
|
spin_lock_irqsave(&pClient->lock, flags);
|
| 866 |
|
|
|
| 867 |
|
|
pMsg->msg_id = msg_id;
|
| 868 |
|
|
pMsg->arg = arg;
|
| 869 |
|
|
pMsg->error_code = error_code;
|
| 870 |
|
|
pMsg->block = pBlock;
|
| 871 |
|
|
pMsg->next = NULL;
|
| 872 |
|
|
|
| 873 |
|
|
if (pClient->last_msg == NULL) {
|
| 874 |
|
|
pClient->first_msg = pClient->last_msg = pMsg;
|
| 875 |
|
|
} else {
|
| 876 |
|
|
pClient->last_msg->next = pMsg;
|
| 877 |
|
|
pClient->last_msg = pMsg;
|
| 878 |
|
|
}
|
| 879 |
|
|
|
| 880 |
|
|
pClient->msg_count++;
|
| 881 |
|
|
|
| 882 |
|
|
if (pBlock != NULL) {
|
| 883 |
|
|
pBlock->locks++;
|
| 884 |
|
|
}
|
| 885 |
|
|
spin_unlock_irqrestore(&pClient->lock, flags);
|
| 886 |
|
|
} else {
|
| 887 |
|
|
if ((pClient->last_msg->msg_id == R3964_MSG_ACK)
|
| 888 |
|
|
&& (pClient->last_msg->error_code == R3964_OVERFLOW)) {
|
| 889 |
|
|
pClient->last_msg->arg++;
|
| 890 |
|
|
TRACE_PE("add_msg - inc prev OVERFLOW-msg");
|
| 891 |
|
|
} else {
|
| 892 |
|
|
msg_id = R3964_MSG_ACK;
|
| 893 |
|
|
arg = 0;
|
| 894 |
|
|
error_code = R3964_OVERFLOW;
|
| 895 |
|
|
pBlock = NULL;
|
| 896 |
|
|
TRACE_PE("add_msg - queue OVERFLOW-msg");
|
| 897 |
|
|
goto queue_the_message;
|
| 898 |
|
|
}
|
| 899 |
|
|
}
|
| 900 |
|
|
/* Send SIGIO signal to client process: */
|
| 901 |
|
|
if (pClient->sig_flags & R3964_USE_SIGIO) {
|
| 902 |
|
|
kill_pid(pClient->pid, SIGIO, 1);
|
| 903 |
|
|
}
|
| 904 |
|
|
}
|
| 905 |
|
|
|
| 906 |
|
|
static struct r3964_message *remove_msg(struct r3964_info *pInfo,
|
| 907 |
|
|
struct r3964_client_info *pClient)
|
| 908 |
|
|
{
|
| 909 |
|
|
struct r3964_message *pMsg = NULL;
|
| 910 |
|
|
unsigned long flags;
|
| 911 |
|
|
|
| 912 |
|
|
if (pClient->first_msg) {
|
| 913 |
|
|
spin_lock_irqsave(&pClient->lock, flags);
|
| 914 |
|
|
|
| 915 |
|
|
pMsg = pClient->first_msg;
|
| 916 |
|
|
pClient->first_msg = pMsg->next;
|
| 917 |
|
|
if (pClient->first_msg == NULL) {
|
| 918 |
|
|
pClient->last_msg = NULL;
|
| 919 |
|
|
}
|
| 920 |
|
|
|
| 921 |
|
|
pClient->msg_count--;
|
| 922 |
|
|
if (pMsg->block) {
|
| 923 |
|
|
remove_client_block(pInfo, pClient);
|
| 924 |
|
|
pClient->next_block_to_read = pMsg->block;
|
| 925 |
|
|
}
|
| 926 |
|
|
spin_unlock_irqrestore(&pClient->lock, flags);
|
| 927 |
|
|
}
|
| 928 |
|
|
return pMsg;
|
| 929 |
|
|
}
|
| 930 |
|
|
|
| 931 |
|
|
static void remove_client_block(struct r3964_info *pInfo,
|
| 932 |
|
|
struct r3964_client_info *pClient)
|
| 933 |
|
|
{
|
| 934 |
|
|
struct r3964_block_header *block;
|
| 935 |
|
|
|
| 936 |
|
|
TRACE_PS("remove_client_block PID %d", pid_nr(pClient->pid));
|
| 937 |
|
|
|
| 938 |
|
|
block = pClient->next_block_to_read;
|
| 939 |
|
|
if (block) {
|
| 940 |
|
|
block->locks--;
|
| 941 |
|
|
if (block->locks == 0) {
|
| 942 |
|
|
remove_from_rx_queue(pInfo, block);
|
| 943 |
|
|
}
|
| 944 |
|
|
}
|
| 945 |
|
|
pClient->next_block_to_read = NULL;
|
| 946 |
|
|
}
|
| 947 |
|
|
|
| 948 |
|
|
/*************************************************************
|
| 949 |
|
|
* Line discipline routines
|
| 950 |
|
|
*************************************************************/
|
| 951 |
|
|
|
| 952 |
|
|
static int r3964_open(struct tty_struct *tty)
|
| 953 |
|
|
{
|
| 954 |
|
|
struct r3964_info *pInfo;
|
| 955 |
|
|
|
| 956 |
|
|
TRACE_L("open");
|
| 957 |
|
|
TRACE_L("tty=%p, PID=%d, disc_data=%p",
|
| 958 |
|
|
tty, current->pid, tty->disc_data);
|
| 959 |
|
|
|
| 960 |
|
|
pInfo = kmalloc(sizeof(struct r3964_info), GFP_KERNEL);
|
| 961 |
|
|
TRACE_M("r3964_open - info kmalloc %p", pInfo);
|
| 962 |
|
|
|
| 963 |
|
|
if (!pInfo) {
|
| 964 |
|
|
printk(KERN_ERR "r3964: failed to alloc info structure\n");
|
| 965 |
|
|
return -ENOMEM;
|
| 966 |
|
|
}
|
| 967 |
|
|
|
| 968 |
|
|
pInfo->rx_buf = kmalloc(RX_BUF_SIZE, GFP_KERNEL);
|
| 969 |
|
|
TRACE_M("r3964_open - rx_buf kmalloc %p", pInfo->rx_buf);
|
| 970 |
|
|
|
| 971 |
|
|
if (!pInfo->rx_buf) {
|
| 972 |
|
|
printk(KERN_ERR "r3964: failed to alloc receive buffer\n");
|
| 973 |
|
|
kfree(pInfo);
|
| 974 |
|
|
TRACE_M("r3964_open - info kfree %p", pInfo);
|
| 975 |
|
|
return -ENOMEM;
|
| 976 |
|
|
}
|
| 977 |
|
|
|
| 978 |
|
|
pInfo->tx_buf = kmalloc(TX_BUF_SIZE, GFP_KERNEL);
|
| 979 |
|
|
TRACE_M("r3964_open - tx_buf kmalloc %p", pInfo->tx_buf);
|
| 980 |
|
|
|
| 981 |
|
|
if (!pInfo->tx_buf) {
|
| 982 |
|
|
printk(KERN_ERR "r3964: failed to alloc transmit buffer\n");
|
| 983 |
|
|
kfree(pInfo->rx_buf);
|
| 984 |
|
|
TRACE_M("r3964_open - rx_buf kfree %p", pInfo->rx_buf);
|
| 985 |
|
|
kfree(pInfo);
|
| 986 |
|
|
TRACE_M("r3964_open - info kfree %p", pInfo);
|
| 987 |
|
|
return -ENOMEM;
|
| 988 |
|
|
}
|
| 989 |
|
|
|
| 990 |
|
|
spin_lock_init(&pInfo->lock);
|
| 991 |
|
|
pInfo->tty = tty;
|
| 992 |
|
|
init_waitqueue_head(&pInfo->read_wait);
|
| 993 |
|
|
pInfo->priority = R3964_MASTER;
|
| 994 |
|
|
pInfo->rx_first = pInfo->rx_last = NULL;
|
| 995 |
|
|
pInfo->tx_first = pInfo->tx_last = NULL;
|
| 996 |
|
|
pInfo->rx_position = 0;
|
| 997 |
|
|
pInfo->tx_position = 0;
|
| 998 |
|
|
pInfo->last_rx = 0;
|
| 999 |
|
|
pInfo->blocks_in_rx_queue = 0;
|
| 1000 |
|
|
pInfo->firstClient = NULL;
|
| 1001 |
|
|
pInfo->state = R3964_IDLE;
|
| 1002 |
|
|
pInfo->flags = R3964_DEBUG;
|
| 1003 |
|
|
pInfo->nRetry = 0;
|
| 1004 |
|
|
|
| 1005 |
|
|
tty->disc_data = pInfo;
|
| 1006 |
|
|
tty->receive_room = 65536;
|
| 1007 |
|
|
|
| 1008 |
|
|
setup_timer(&pInfo->tmr, on_timeout, (unsigned long)pInfo);
|
| 1009 |
|
|
|
| 1010 |
|
|
return 0;
|
| 1011 |
|
|
}
|
| 1012 |
|
|
|
| 1013 |
|
|
static void r3964_close(struct tty_struct *tty)
|
| 1014 |
|
|
{
|
| 1015 |
|
|
struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
|
| 1016 |
|
|
struct r3964_client_info *pClient, *pNext;
|
| 1017 |
|
|
struct r3964_message *pMsg;
|
| 1018 |
|
|
struct r3964_block_header *pHeader, *pNextHeader;
|
| 1019 |
|
|
unsigned long flags;
|
| 1020 |
|
|
|
| 1021 |
|
|
TRACE_L("close");
|
| 1022 |
|
|
|
| 1023 |
|
|
/*
|
| 1024 |
|
|
* Make sure that our task queue isn't activated. If it
|
| 1025 |
|
|
* is, take it out of the linked list.
|
| 1026 |
|
|
*/
|
| 1027 |
|
|
del_timer_sync(&pInfo->tmr);
|
| 1028 |
|
|
|
| 1029 |
|
|
/* Remove client-structs and message queues: */
|
| 1030 |
|
|
pClient = pInfo->firstClient;
|
| 1031 |
|
|
while (pClient) {
|
| 1032 |
|
|
pNext = pClient->next;
|
| 1033 |
|
|
while (pClient->msg_count) {
|
| 1034 |
|
|
pMsg = remove_msg(pInfo, pClient);
|
| 1035 |
|
|
if (pMsg) {
|
| 1036 |
|
|
kfree(pMsg);
|
| 1037 |
|
|
TRACE_M("r3964_close - msg kfree %p", pMsg);
|
| 1038 |
|
|
}
|
| 1039 |
|
|
}
|
| 1040 |
|
|
put_pid(pClient->pid);
|
| 1041 |
|
|
kfree(pClient);
|
| 1042 |
|
|
TRACE_M("r3964_close - client kfree %p", pClient);
|
| 1043 |
|
|
pClient = pNext;
|
| 1044 |
|
|
}
|
| 1045 |
|
|
/* Remove jobs from tx_queue: */
|
| 1046 |
|
|
spin_lock_irqsave(&pInfo->lock, flags);
|
| 1047 |
|
|
pHeader = pInfo->tx_first;
|
| 1048 |
|
|
pInfo->tx_first = pInfo->tx_last = NULL;
|
| 1049 |
|
|
spin_unlock_irqrestore(&pInfo->lock, flags);
|
| 1050 |
|
|
|
| 1051 |
|
|
while (pHeader) {
|
| 1052 |
|
|
pNextHeader = pHeader->next;
|
| 1053 |
|
|
kfree(pHeader);
|
| 1054 |
|
|
pHeader = pNextHeader;
|
| 1055 |
|
|
}
|
| 1056 |
|
|
|
| 1057 |
|
|
/* Free buffers: */
|
| 1058 |
|
|
wake_up_interruptible(&pInfo->read_wait);
|
| 1059 |
|
|
kfree(pInfo->rx_buf);
|
| 1060 |
|
|
TRACE_M("r3964_close - rx_buf kfree %p", pInfo->rx_buf);
|
| 1061 |
|
|
kfree(pInfo->tx_buf);
|
| 1062 |
|
|
TRACE_M("r3964_close - tx_buf kfree %p", pInfo->tx_buf);
|
| 1063 |
|
|
kfree(pInfo);
|
| 1064 |
|
|
TRACE_M("r3964_close - info kfree %p", pInfo);
|
| 1065 |
|
|
}
|
| 1066 |
|
|
|
| 1067 |
|
|
static ssize_t r3964_read(struct tty_struct *tty, struct file *file,
|
| 1068 |
|
|
unsigned char __user * buf, size_t nr)
|
| 1069 |
|
|
{
|
| 1070 |
|
|
struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
|
| 1071 |
|
|
struct r3964_client_info *pClient;
|
| 1072 |
|
|
struct r3964_message *pMsg;
|
| 1073 |
|
|
struct r3964_client_message theMsg;
|
| 1074 |
|
|
int count;
|
| 1075 |
|
|
|
| 1076 |
|
|
TRACE_L("read()");
|
| 1077 |
|
|
|
| 1078 |
|
|
pClient = findClient(pInfo, task_pid(current));
|
| 1079 |
|
|
if (pClient) {
|
| 1080 |
|
|
pMsg = remove_msg(pInfo, pClient);
|
| 1081 |
|
|
if (pMsg == NULL) {
|
| 1082 |
|
|
/* no messages available. */
|
| 1083 |
|
|
if (file->f_flags & O_NONBLOCK) {
|
| 1084 |
|
|
return -EAGAIN;
|
| 1085 |
|
|
}
|
| 1086 |
|
|
/* block until there is a message: */
|
| 1087 |
|
|
wait_event_interruptible(pInfo->read_wait,
|
| 1088 |
|
|
(pMsg = remove_msg(pInfo, pClient)));
|
| 1089 |
|
|
}
|
| 1090 |
|
|
|
| 1091 |
|
|
/* If we still haven't got a message, we must have been signalled */
|
| 1092 |
|
|
|
| 1093 |
|
|
if (!pMsg)
|
| 1094 |
|
|
return -EINTR;
|
| 1095 |
|
|
|
| 1096 |
|
|
/* deliver msg to client process: */
|
| 1097 |
|
|
theMsg.msg_id = pMsg->msg_id;
|
| 1098 |
|
|
theMsg.arg = pMsg->arg;
|
| 1099 |
|
|
theMsg.error_code = pMsg->error_code;
|
| 1100 |
|
|
count = sizeof(struct r3964_client_message);
|
| 1101 |
|
|
|
| 1102 |
|
|
kfree(pMsg);
|
| 1103 |
|
|
TRACE_M("r3964_read - msg kfree %p", pMsg);
|
| 1104 |
|
|
|
| 1105 |
|
|
if (copy_to_user(buf, &theMsg, count))
|
| 1106 |
|
|
return -EFAULT;
|
| 1107 |
|
|
|
| 1108 |
|
|
TRACE_PS("read - return %d", count);
|
| 1109 |
|
|
return count;
|
| 1110 |
|
|
}
|
| 1111 |
|
|
return -EPERM;
|
| 1112 |
|
|
}
|
| 1113 |
|
|
|
| 1114 |
|
|
static ssize_t r3964_write(struct tty_struct *tty, struct file *file,
|
| 1115 |
|
|
const unsigned char *data, size_t count)
|
| 1116 |
|
|
{
|
| 1117 |
|
|
struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
|
| 1118 |
|
|
struct r3964_block_header *pHeader;
|
| 1119 |
|
|
struct r3964_client_info *pClient;
|
| 1120 |
|
|
unsigned char *new_data;
|
| 1121 |
|
|
|
| 1122 |
|
|
TRACE_L("write request, %d characters", count);
|
| 1123 |
|
|
/*
|
| 1124 |
|
|
* Verify the pointers
|
| 1125 |
|
|
*/
|
| 1126 |
|
|
|
| 1127 |
|
|
if (!pInfo)
|
| 1128 |
|
|
return -EIO;
|
| 1129 |
|
|
|
| 1130 |
|
|
/*
|
| 1131 |
|
|
* Ensure that the caller does not wish to send too much.
|
| 1132 |
|
|
*/
|
| 1133 |
|
|
if (count > R3964_MTU) {
|
| 1134 |
|
|
if (pInfo->flags & R3964_DEBUG) {
|
| 1135 |
|
|
TRACE_L(KERN_WARNING "r3964_write: truncating user "
|
| 1136 |
|
|
"packet from %u to mtu %d", count, R3964_MTU);
|
| 1137 |
|
|
}
|
| 1138 |
|
|
count = R3964_MTU;
|
| 1139 |
|
|
}
|
| 1140 |
|
|
/*
|
| 1141 |
|
|
* Allocate a buffer for the data and copy it from the buffer with header prepended
|
| 1142 |
|
|
*/
|
| 1143 |
|
|
new_data = kmalloc(count + sizeof(struct r3964_block_header),
|
| 1144 |
|
|
GFP_KERNEL);
|
| 1145 |
|
|
TRACE_M("r3964_write - kmalloc %p", new_data);
|
| 1146 |
|
|
if (new_data == NULL) {
|
| 1147 |
|
|
if (pInfo->flags & R3964_DEBUG) {
|
| 1148 |
|
|
printk(KERN_ERR "r3964_write: no memory\n");
|
| 1149 |
|
|
}
|
| 1150 |
|
|
return -ENOSPC;
|
| 1151 |
|
|
}
|
| 1152 |
|
|
|
| 1153 |
|
|
pHeader = (struct r3964_block_header *)new_data;
|
| 1154 |
|
|
pHeader->data = new_data + sizeof(struct r3964_block_header);
|
| 1155 |
|
|
pHeader->length = count;
|
| 1156 |
|
|
pHeader->locks = 0;
|
| 1157 |
|
|
pHeader->owner = NULL;
|
| 1158 |
|
|
|
| 1159 |
|
|
pClient = findClient(pInfo, task_pid(current));
|
| 1160 |
|
|
if (pClient) {
|
| 1161 |
|
|
pHeader->owner = pClient;
|
| 1162 |
|
|
}
|
| 1163 |
|
|
|
| 1164 |
|
|
memcpy(pHeader->data, data, count); /* We already verified this */
|
| 1165 |
|
|
|
| 1166 |
|
|
if (pInfo->flags & R3964_DEBUG) {
|
| 1167 |
|
|
dump_block(pHeader->data, count);
|
| 1168 |
|
|
}
|
| 1169 |
|
|
|
| 1170 |
|
|
/*
|
| 1171 |
|
|
* Add buffer to transmit-queue:
|
| 1172 |
|
|
*/
|
| 1173 |
|
|
add_tx_queue(pInfo, pHeader);
|
| 1174 |
|
|
trigger_transmit(pInfo);
|
| 1175 |
|
|
|
| 1176 |
|
|
return 0;
|
| 1177 |
|
|
}
|
| 1178 |
|
|
|
| 1179 |
|
|
static int r3964_ioctl(struct tty_struct *tty, struct file *file,
|
| 1180 |
|
|
unsigned int cmd, unsigned long arg)
|
| 1181 |
|
|
{
|
| 1182 |
|
|
struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
|
| 1183 |
|
|
if (pInfo == NULL)
|
| 1184 |
|
|
return -EINVAL;
|
| 1185 |
|
|
switch (cmd) {
|
| 1186 |
|
|
case R3964_ENABLE_SIGNALS:
|
| 1187 |
|
|
return enable_signals(pInfo, task_pid(current), arg);
|
| 1188 |
|
|
case R3964_SETPRIORITY:
|
| 1189 |
|
|
if (arg < R3964_MASTER || arg > R3964_SLAVE)
|
| 1190 |
|
|
return -EINVAL;
|
| 1191 |
|
|
pInfo->priority = arg & 0xff;
|
| 1192 |
|
|
return 0;
|
| 1193 |
|
|
case R3964_USE_BCC:
|
| 1194 |
|
|
if (arg)
|
| 1195 |
|
|
pInfo->flags |= R3964_BCC;
|
| 1196 |
|
|
else
|
| 1197 |
|
|
pInfo->flags &= ~R3964_BCC;
|
| 1198 |
|
|
return 0;
|
| 1199 |
|
|
case R3964_READ_TELEGRAM:
|
| 1200 |
|
|
return read_telegram(pInfo, task_pid(current),
|
| 1201 |
|
|
(unsigned char __user *)arg);
|
| 1202 |
|
|
default:
|
| 1203 |
|
|
return -ENOIOCTLCMD;
|
| 1204 |
|
|
}
|
| 1205 |
|
|
}
|
| 1206 |
|
|
|
| 1207 |
|
|
static void r3964_set_termios(struct tty_struct *tty, struct ktermios *old)
|
| 1208 |
|
|
{
|
| 1209 |
|
|
TRACE_L("set_termios");
|
| 1210 |
|
|
}
|
| 1211 |
|
|
|
| 1212 |
|
|
/* Called without the kernel lock held - fine */
|
| 1213 |
|
|
static unsigned int r3964_poll(struct tty_struct *tty, struct file *file,
|
| 1214 |
|
|
struct poll_table_struct *wait)
|
| 1215 |
|
|
{
|
| 1216 |
|
|
struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
|
| 1217 |
|
|
struct r3964_client_info *pClient;
|
| 1218 |
|
|
struct r3964_message *pMsg = NULL;
|
| 1219 |
|
|
unsigned long flags;
|
| 1220 |
|
|
int result = POLLOUT;
|
| 1221 |
|
|
|
| 1222 |
|
|
TRACE_L("POLL");
|
| 1223 |
|
|
|
| 1224 |
|
|
pClient = findClient(pInfo, task_pid(current));
|
| 1225 |
|
|
if (pClient) {
|
| 1226 |
|
|
poll_wait(file, &pInfo->read_wait, wait);
|
| 1227 |
|
|
spin_lock_irqsave(&pInfo->lock, flags);
|
| 1228 |
|
|
pMsg = pClient->first_msg;
|
| 1229 |
|
|
spin_unlock_irqrestore(&pInfo->lock, flags);
|
| 1230 |
|
|
if (pMsg)
|
| 1231 |
|
|
result |= POLLIN | POLLRDNORM;
|
| 1232 |
|
|
} else {
|
| 1233 |
|
|
result = -EINVAL;
|
| 1234 |
|
|
}
|
| 1235 |
|
|
return result;
|
| 1236 |
|
|
}
|
| 1237 |
|
|
|
| 1238 |
|
|
static void r3964_receive_buf(struct tty_struct *tty, const unsigned char *cp,
|
| 1239 |
|
|
char *fp, int count)
|
| 1240 |
|
|
{
|
| 1241 |
|
|
struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
|
| 1242 |
|
|
const unsigned char *p;
|
| 1243 |
|
|
char *f, flags = 0;
|
| 1244 |
|
|
int i;
|
| 1245 |
|
|
|
| 1246 |
|
|
for (i = count, p = cp, f = fp; i; i--, p++) {
|
| 1247 |
|
|
if (f)
|
| 1248 |
|
|
flags = *f++;
|
| 1249 |
|
|
if (flags == TTY_NORMAL) {
|
| 1250 |
|
|
receive_char(pInfo, *p);
|
| 1251 |
|
|
} else {
|
| 1252 |
|
|
receive_error(pInfo, flags);
|
| 1253 |
|
|
}
|
| 1254 |
|
|
|
| 1255 |
|
|
}
|
| 1256 |
|
|
}
|
| 1257 |
|
|
|
| 1258 |
|
|
MODULE_LICENSE("GPL");
|
| 1259 |
|
|
MODULE_ALIAS_LDISC(N_R3964);
|
