cm4000_cs.c

linux-2.6.15.6

 /*
  * A driver for the PCMCIA Smartcard Reader "Omnikey CardMan Mobile 4000"
  *
  * cm4000_cs.c [e-mail]
  *
  * Tue Oct 23 11:32:43 GMT 2001 herp - cleaned up header files
  * Sun Jan 20 10:11:15 MET 2002 herp - added modversion header files
  * Thu Nov 14 16:34:11 GMT 2002 mh   - added PPS functionality
  * Tue Nov 19 16:36:27 GMT 2002 mh   - added SUSPEND/RESUME functionailty
  * Wed Jul 28 12:55:01 CEST 2004 mh  - kernel 2.6 adjustments
  *
  * current version: 2.4.0gm4
  *
  * (C) 2000,2001,2002,2003,2004 Omnikey AG
  *
  * (C) 2005 Harald Welte <[e-mail]>
  * 	- Adhere to Kernel CodingStyle
  * 	- Port to 2.6.13 "new" style PCMCIA
  * 	- Check for copy_{from,to}_user return values
  * 	- Use nonseekable_open()
  *
  * All rights reserved. Licensed under dual BSD/GPL license.
  */

/* #define PCMCIA_DEBUG 6 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
#include <asm/io.h>

#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ciscode.h>
#include <pcmcia/ds.h>

#include <linux/cm4000_cs.h>

/* #define ATR_CSUM */

#ifdef PCMCIA_DEBUG
#define reader_to_dev(x)	(&handle_to_dev(x->link.handle))
static int pc_debug = PCMCIA_DEBUG;
module_param(pc_debug, int, 0600);
#define DEBUGP(n, rdr, x, args...) do { 				\
	if (pc_debug >= (n))						\
		dev_printk(KERN_DEBUG, reader_to_dev(rdr), "%s:" x, 	\
			   __FUNCTION__ , ## args);			\
	} while (0)
#else
#define DEBUGP(n, rdr, x, args...)
#endif
static char *version = "cm4000_cs.c v2.4.0gm5 - All bugs added by Harald Welte";

#define	T_1SEC		(HZ)
#define	T_10MSEC	msecs_to_jiffies(10)
#define	T_20MSEC	msecs_to_jiffies(20)
#define	T_40MSEC	msecs_to_jiffies(40)
#define	T_50MSEC	msecs_to_jiffies(50)
#define	T_100MSEC	msecs_to_jiffies(100)
#define	T_500MSEC	msecs_to_jiffies(500)

static void cm4000_detach(dev_link_t *link);
static void cm4000_release(dev_link_t *link);

static int major;		/* major number we get from the kernel */

/* note: the first state has to have number 0 always */

#define	M_FETCH_ATR	0
#define	M_TIMEOUT_WAIT	1
#define	M_READ_ATR_LEN	2
#define	M_READ_ATR	3
#define	M_ATR_PRESENT	4
#define	M_BAD_CARD	5
#define M_CARDOFF	6

#define	LOCK_IO			0
#define	LOCK_MONITOR		1

#define IS_AUTOPPS_ACT		 6
#define	IS_PROCBYTE_PRESENT	 7
#define	IS_INVREV		 8
#define IS_ANY_T0		 9
#define	IS_ANY_T1		10
#define	IS_ATR_PRESENT		11
#define	IS_ATR_VALID		12
#define	IS_CMM_ABSENT		13
#define	IS_BAD_LENGTH		14
#define	IS_BAD_CSUM		15
#define	IS_BAD_CARD		16

#define REG_FLAGS0(x)		(x + 0)
#define REG_FLAGS1(x)		(x + 1)
#define REG_NUM_BYTES(x)	(x + 2)
#define REG_BUF_ADDR(x)		(x + 3)
#define REG_BUF_DATA(x)		(x + 4)
#define REG_NUM_SEND(x)		(x + 5)
#define REG_BAUDRATE(x)		(x + 6)
#define REG_STOPBITS(x)		(x + 7)

struct cm4000_dev {
	dev_link_t link;		/* pcmcia link */
	dev_node_t node;		/* OS node (major,minor) */

	unsigned char atr[MAX_ATR];
	unsigned char rbuf[512];
	unsigned char sbuf[512];

	wait_queue_head_t devq;		/* when removing cardman must not be
					   zeroed! */

	wait_queue_head_t ioq;		/* if IO is locked, wait on this Q */
	wait_queue_head_t atrq;		/* wait for ATR valid */
	wait_queue_head_t readq;	/* used by write to wake blk.read */

	/* warning: do not move this fields.
	 * initialising to zero depends on it - see ZERO_DEV below.  */
	unsigned char atr_csum;
	unsigned char atr_len_retry;
	unsigned short atr_len;
	unsigned short rlen;	/* bytes avail. after write */
	unsigned short rpos;	/* latest read pos. write zeroes */
	unsigned char procbyte;	/* T=0 procedure byte */
	unsigned char mstate;	/* state of card monitor */
	unsigned char cwarn;	/* slow down warning */
	unsigned char flags0;	/* cardman IO-flags 0 */
	unsigned char flags1;	/* cardman IO-flags 1 */
	unsigned int mdelay;	/* variable monitor speeds, in jiffies */

	unsigned int baudv;	/* baud value for speed */
	unsigned char ta1;
	unsigned char proto;	/* T=0, T=1, ... */
	unsigned long flags;	/* lock+flags (MONITOR,IO,ATR) * for concurrent
				   access */

	unsigned char pts[4];

	struct timer_list timer;	/* used to keep monitor running */
	int monitor_running;
};

#define	ZERO_DEV(dev)  						\
	memset(&dev->atr_csum,0,				\
		sizeof(struct cm4000_dev) - 			\
		/*link*/ sizeof(dev_link_t) - 			\
		/*node*/ sizeof(dev_node_t) - 			\
		/*atr*/ MAX_ATR*sizeof(char) - 			\
		/*rbuf*/ 512*sizeof(char) - 			\
		/*sbuf*/ 512*sizeof(char) - 			\
		/*queue*/ 4*sizeof(wait_queue_head_t))

static dev_info_t dev_info = MODULE_NAME;
static dev_link_t *dev_table[CM4000_MAX_DEV];

/* This table doesn't use spaces after the comma between fields and thus
 * violates CodingStyle.  However, I don't really think wrapping it around will
 * make it any clearer to read -HW */
static unsigned char fi_di_table[10][14] = {
/*FI     00   01   02   03   04   05   06   07   08   09   10   11   12   13 */
/*DI */
/* 0 */ {0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11},
/* 1 */ {0x01,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x91,0x11,0x11,0x11,0x11},
/* 2 */ {0x02,0x12,0x22,0x32,0x11,0x11,0x11,0x11,0x11,0x92,0xA2,0xB2,0x11,0x11},
/* 3 */ {0x03,0x13,0x23,0x33,0x43,0x53,0x63,0x11,0x11,0x93,0xA3,0xB3,0xC3,0xD3},
/* 4 */ {0x04,0x14,0x24,0x34,0x44,0x54,0x64,0x11,0x11,0x94,0xA4,0xB4,0xC4,0xD4},
/* 5 */ {0x00,0x15,0x25,0x35,0x45,0x55,0x65,0x11,0x11,0x95,0xA5,0xB5,0xC5,0xD5},
/* 6 */ {0x06,0x16,0x26,0x36,0x46,0x56,0x66,0x11,0x11,0x96,0xA6,0xB6,0xC6,0xD6},
/* 7 */ {0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11},
/* 8 */ {0x08,0x11,0x28,0x38,0x48,0x58,0x68,0x11,0x11,0x98,0xA8,0xB8,0xC8,0xD8},
/* 9 */ {0x09,0x19,0x29,0x39,0x49,0x59,0x69,0x11,0x11,0x99,0xA9,0xB9,0xC9,0xD9}
};

#ifndef PCMCIA_DEBUG
#define	xoutb	outb
#define	xinb	inb
#else
static inline void xoutb(unsigned char val, unsigned short port)
{
	if (pc_debug >= 7)
		printk(KERN_DEBUG "outb(val=%.2x,port=%.4x)\n", val, port);
	outb(val, port);
}
static inline unsigned char xinb(unsigned short port)
{
	unsigned char val;

	val = inb(port);
	if (pc_debug >= 7)
		printk(KERN_DEBUG "%.2x=inb(%.4x)\n", val, port);

	return val;
}
#endif

#define	b_0000	15
#define	b_0001	14
#define	b_0010	13
#define	b_0011	12
#define	b_0100	11
#define	b_0101	10
#define	b_0110	9
#define	b_0111	8
#define	b_1000	7
#define	b_1001	6
#define	b_1010	5
#define	b_1011	4
#define	b_1100	3
#define	b_1101	2
#define	b_1110	1
#define	b_1111	0

static unsigned char irtab[16] = {
	b_0000, b_1000, b_0100, b_1100,
	b_0010, b_1010, b_0110, b_1110,
	b_0001, b_1001, b_0101, b_1101,
	b_0011, b_1011, b_0111, b_1111
};

static void str_invert_revert(unsigned char *b, int len)
{
	int i;

	for (i = 0; i < len; i++)
		b[i] = (irtab[b[i] & 0x0f] << 4) | irtab[b[i] >> 4];
}

static unsigned char invert_revert(unsigned char ch)
{
	return (irtab[ch & 0x0f] << 4) | irtab[ch >> 4];
}

#define	ATRLENCK(dev,pos) \
	if (pos>=dev->atr_len || pos>=MAX_ATR) \
		goto return_0;

static unsigned int calc_baudv(unsigned char fidi)
{
	unsigned int wcrcf, wbrcf, fi_rfu, di_rfu;

	fi_rfu = 372;
	di_rfu = 1;

	/* FI */
	switch ((fidi >> 4) & 0x0F) {
	case 0x00:
		wcrcf = 372;
		break;
	case 0x01:
		wcrcf = 372;
		break;
	case 0x02:
		wcrcf = 558;
		break;
	case 0x03:
		wcrcf = 744;
		break;
	case 0x04:
		wcrcf = 1116;
		break;
	case 0x05:
		wcrcf = 1488;
		break;
	case 0x06:
		wcrcf = 1860;
		break;
	case 0x07:
		wcrcf = fi_rfu;
		break;
	case 0x08:
		wcrcf = fi_rfu;
		break;
	case 0x09:
		wcrcf = 512;
		break;
	case 0x0A:
		wcrcf = 768;
		break;
	case 0x0B:
		wcrcf = 1024;
		break;
	case 0x0C:
		wcrcf = 1536;
		break;
	case 0x0D:
		wcrcf = 2048;
		break;
	default:
		wcrcf = fi_rfu;
		break;
	}

	/* DI */
	switch (fidi & 0x0F) {
	case 0x00:
		wbrcf = di_rfu;
		break;
	case 0x01:
		wbrcf = 1;
		break;
	case 0x02:
		wbrcf = 2;
		break;
	case 0x03:
		wbrcf = 4;
		break;
	case 0x04:
		wbrcf = 8;
		break;
	case 0x05:
		wbrcf = 16;
		break;
	case 0x06:
		wbrcf = 32;
		break;
	case 0x07:
		wbrcf = di_rfu;
		break;
	case 0x08:
		wbrcf = 12;
		break;
	case 0x09:
		wbrcf = 20;
		break;
	default:
		wbrcf = di_rfu;
		break;
	}

	return (wcrcf / wbrcf);
}

static unsigned short io_read_num_rec_bytes(ioaddr_t iobase, unsigned short *s)
{
	unsigned short tmp;

	tmp = *s = 0;
	do {
		*s = tmp;
		tmp = inb(REG_NUM_BYTES(iobase)) |
				(inb(REG_FLAGS0(iobase)) & 4 ? 0x100 : 0);
	} while (tmp != *s);

	return *s;
}

static int parse_atr(struct cm4000_dev *dev)
{
	unsigned char any_t1, any_t0;
	unsigned char ch, ifno;
	int ix, done;

	DEBUGP(3, dev, "-> parse_atr: dev->atr_len = %i\n", dev->atr_len);

	if (dev->atr_len < 3) {
		DEBUGP(5, dev, "parse_atr: atr_len < 3\n");
		return 0;
	}

	if (dev->atr[0] == 0x3f)
		set_bit(IS_INVREV, &dev->flags);
	else
		clear_bit(IS_INVREV, &dev->flags);
	ix = 1;
	ifno = 1;
	ch = dev->atr[1];
	dev->proto = 0;		/* XXX PROTO */
	any_t1 = any_t0 = done = 0;
	dev->ta1 = 0x11;	/* defaults to 9600 baud */
	do {
		if (ifno == 1 && (ch & 0x10)) {
			/* read first interface byte and TA1 is present */
			dev->ta1 = dev->atr[2];
			DEBUGP(5, dev, "Card says FiDi is 0x%.2x\n", dev->ta1);
			ifno++;
		} else if ((ifno == 2) && (ch & 0x10)) { /* TA(2) */
			dev->ta1 = 0x11;
			ifno++;
		}

		DEBUGP(5, dev, "Yi=%.2x\n", ch & 0xf0);
		ix += ((ch & 0x10) >> 4)	/* no of int.face chars */
		    +((ch & 0x20) >> 5)
		    + ((ch & 0x40) >> 6)
		    + ((ch & 0x80) >> 7);
		/* ATRLENCK(dev,ix); */
		if (ch & 0x80) {	/* TDi */
			ch = dev->atr[ix];
			if ((ch & 0x0f)) {
				any_t1 = 1;
				DEBUGP(5, dev, "card is capable of T=1\n");
			} else {
				any_t0 = 1;
				DEBUGP(5, dev, "card is capable of T=0\n");
			}
		} else
			done = 1;
	} while (!done);

	DEBUGP(5, dev, "ix=%d noHist=%d any_t1=%d\n",
	      ix, dev->atr[1] & 15, any_t1);
	if (ix + 1 + (dev->atr[1] & 0x0f) + any_t1 != dev->atr_len) {
		DEBUGP(5, dev, "length error\n");
		return 0;
	}
	if (any_t0)
		set_bit(IS_ANY_T0, &dev->flags);

	if (any_t1) {		/* compute csum */
		dev->atr_csum = 0;
#ifdef ATR_CSUM
		for (i = 1; i < dev->atr_len; i++)
			dev->atr_csum ^= dev->atr[i];
		if (dev->atr_csum) {
			set_bit(IS_BAD_CSUM, &dev->flags);
			DEBUGP(5, dev, "bad checksum\n");
			goto return_0;
		}
#endif
		if (any_t0 == 0)
			dev->proto = 1;	/* XXX PROTO */
		set_bit(IS_ANY_T1, &dev->flags);
	}

	return 1;
}

struct card_fixup {
	char atr[12];
	u_int8_t atr_len;
	u_int8_t stopbits;
};

static struct card_fixup card_fixups[] = {
	{	/* ACOS */
		.atr = { 0x3b, 0xb3, 0x11, 0x00, 0x00, 0x41, 0x01 },
		.atr_len = 7,
		.stopbits = 0x03,
	},
	{	/* Motorola */
		.atr = {0x3b, 0x76, 0x13, 0x00, 0x00, 0x80, 0x62, 0x07,
			0x41, 0x81, 0x81 },
		.atr_len = 11,
		.stopbits = 0x04,
	},
};

static void set_cardparameter(struct cm4000_dev *dev)
{
	int i;
	ioaddr_t iobase = dev->link.io.BasePort1;
	u_int8_t stopbits = 0x02; /* ISO default */

	DEBUGP(3, dev, "-> set_cardparameter\n");

	dev->flags1 = dev->flags1 | (((dev->baudv - 1) & 0x0100) >> 8);
	xoutb(dev->flags1, REG_FLAGS1(iobase));
	DEBUGP(5, dev, "flags1 = 0x%02x\n", dev->flags1);

	/* set baudrate */
	xoutb((unsigned char)((dev->baudv - 1) & 0xFF), REG_BAUDRATE(iobase));

	DEBUGP(5, dev, "baudv = %i -> write 0x%02x\n", dev->baudv,
	      ((dev->baudv - 1) & 0xFF));

	/* set stopbits */
	for (i = 0; i < ARRAY_SIZE(card_fixups); i++) {
		if (!memcmp(dev->atr, card_fixups[i].atr,
			    card_fixups[i].atr_len))
			stopbits = card_fixups[i].stopbits;
	}
	xoutb(stopbits, REG_STOPBITS(iobase));

	DEBUGP(3, dev, "<- set_cardparameter\n");
}

static int set_protocol(struct cm4000_dev *dev, struct ptsreq *ptsreq)
{

	unsigned long tmp, i;
	unsigned short num_bytes_read;
	unsigned char pts_reply[4];
	ssize_t rc;
	ioaddr_t iobase = dev->link.io.BasePort1;

	rc = 0;

	DEBUGP(3, dev, "-> set_protocol\n");
	DEBUGP(5, dev, "ptsreq->Protocol = 0x%.8x, ptsreq->Flags=0x%.8x, "
		 "ptsreq->pts1=0x%.2x, ptsreq->pts2=0x%.2x, "
		 "ptsreq->pts3=0x%.2x\n", (unsigned int)ptsreq->protocol,
		 (unsigned int)ptsreq->flags, ptsreq->pts1, ptsreq->pts2,
		 ptsreq->pts3);

	/* Fill PTS structure */
	dev->pts[0] = 0xff;
	dev->pts[1] = 0x00;
	tmp = ptsreq->protocol;
	while ((tmp = (tmp >> 1)) > 0)
		dev->pts[1]++;
	dev->proto = dev->pts[1];	/* Set new protocol */
	dev->pts[1] = (0x01 << 4) | (dev->pts[1]);

	/* Correct Fi/Di according to CM4000 Fi/Di table */
	DEBUGP(5, dev, "Ta(1) from ATR is 0x%.2x\n", dev->ta1);
	/* set Fi/Di according to ATR TA(1) */
	dev->pts[2] = fi_di_table[dev->ta1 & 0x0F][(dev->ta1 >> 4) & 0x0F];

	/* Calculate PCK character */
	dev->pts[3] = dev->pts[0] ^ dev->pts[1] ^ dev->pts[2];

	DEBUGP(5, dev, "pts0=%.2x, pts1=%.2x, pts2=%.2x, pts3=%.2x\n",
	       dev->pts[0], dev->pts[1], dev->pts[2], dev->pts[3]);