path: root/drivers/tty/n_r3964.c

/* r3964 linediscipline for linux
 *
 * -----------------------------------------------------------
 * Copyright by 
 * Philips Automation Projects
 * Kassel (Germany)
 * -----------------------------------------------------------
 * This software may be used and distributed according to the terms of
 * the GNU General Public License, incorporated herein by reference.
 *
 * Author:
 * L. Haag
 *
 * $Log: n_r3964.c,v $
 * Revision 1.10  2001/03/18 13:02:24  dwmw2
 * Fix timer usage, use spinlocks properly.
 *
 * Revision 1.9  2001/03/18 12:52:14  dwmw2
 * Merge changes in 2.4.2
 *
 * Revision 1.8  2000/03/23 14:14:54  dwmw2
 * Fix race in sleeping in r3964_read()
 *
 * Revision 1.7  1999/28/08 11:41:50  dwmw2
 * Port to 2.3 kernel
 *
 * Revision 1.6  1998/09/30 00:40:40  dwmw2
 * Fixed compilation on 2.0.x kernels
 * Updated to newly registered tty-ldisc number 9
 *
 * Revision 1.5  1998/09/04 21:57:36  dwmw2
 * Signal handling bug fixes, port to 2.1.x.
 *
 * Revision 1.4  1998/04/02 20:26:59  lhaag
 * select, blocking, ...
 *
 * Revision 1.3  1998/02/12 18:58:43  root
 * fixed some memory leaks
 * calculation of checksum characters
 *
 * Revision 1.2  1998/02/07 13:03:34  root
 * ioctl read_telegram
 *
 * Revision 1.1  1998/02/06 19:21:03  root
 * Initial revision
 *
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/errno.h>
#include <linux/string.h>	/* used in new tty drivers */
#include <linux/signal.h>	/* used in new tty drivers */
#include <linux/ioctl.h>
#include <linux/n_r3964.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <asm/uaccess.h>

/*#define DEBUG_QUEUE*/

/* Log successful handshake and protocol operations  */
/*#define DEBUG_PROTO_S*/

/* Log handshake and protocol errors: */
/*#define DEBUG_PROTO_E*/

/* Log Linediscipline operations (open, close, read, write...): */
/*#define DEBUG_LDISC*/

/* Log module and memory operations (init, cleanup; kmalloc, kfree): */
/*#define DEBUG_MODUL*/

/* Macro helpers for debug output: */
#define TRACE(format, args...) printk("r3964: " format "\n" , ## args)

#ifdef DEBUG_MODUL
#define TRACE_M(format, args...) printk("r3964: " format "\n" , ## args)
#else
#define TRACE_M(fmt, arg...) do {} while (0)
#endif
#ifdef DEBUG_PROTO_S
#define TRACE_PS(format, args...) printk("r3964: " format "\n" , ## args)
#else
#define TRACE_PS(fmt, arg...) do {} while (0)
#endif
#ifdef DEBUG_PROTO_E
#define TRACE_PE(format, args...) printk("r3964: " format "\n" , ## args)
#else
#define TRACE_PE(fmt, arg...) do {} while (0)
#endif
#ifdef DEBUG_LDISC
#define TRACE_L(format, args...) printk("r3964: " format "\n" , ## args)
#else
#define TRACE_L(fmt, arg...) do {} while (0)
#endif
#ifdef DEBUG_QUEUE
#define TRACE_Q(format, args...) printk("r3964: " format "\n" , ## args)
#else
#define TRACE_Q(fmt, arg...) do {} while (0)
#endif
static void add_tx_queue(struct r3964_info *, struct r3964_block_header *);
static void remove_from_tx_queue(struct r3964_info *pInfo, int error_code);
static void put_char(struct r3964_info *pInfo, unsigned char ch);
static void trigger_transmit(struct r3964_info *pInfo);
static void retry_transmit(struct r3964_info *pInfo);
static void transmit_block(struct r3964_info *pInfo);
static void receive_char(struct r3964_info *pInfo, const unsigned char c);
static void receive_error(struct r3964_info *pInfo, const char flag);
static void on_timeout(unsigned long priv);
static int enable_signals(struct r3964_info *pInfo, struct pid *pid, int arg);
static int read_telegram(struct r3964_info *pInfo, struct pid *pid,
		unsigned char __user * buf);
static void add_msg(struct r3964_client_info *pClient, int msg_id, int arg,
		int error_code, struct r3964_block_header *pBlock);
static struct