/*
 * IDE ATAPI floppy driver.
 *
 * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
 * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
 * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
 *
 * This driver supports the following IDE floppy drives:
 *
 * LS-120/240 SuperDisk
 * Iomega Zip 100/250
 * Iomega PC Card Clik!/PocketZip
 *
 * For a historical changelog see
 * Documentation/ide/ChangeLog.ide-floppy.1996-2002
 */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/cdrom.h>
#include <linux/ide.h>
#include <linux/hdreg.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>

#include <scsi/scsi_ioctl.h>

#include <asm/byteorder.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/unaligned.h>

#include "ide-floppy.h"

/*
 * After each failed packet command we issue a request sense command and retry
 * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
 */
#define IDEFLOPPY_MAX_PC_RETRIES	3

/* format capacities descriptor codes */
#define CAPACITY_INVALID	0x00
#define CAPACITY_UNFORMATTED	0x01
#define CAPACITY_CURRENT	0x02
#define CAPACITY_NO_CARTRIDGE	0x03

/*
 * The following delay solves a problem with ATAPI Zip 100 drive where BSY bit
 * was apparently being deasserted before the unit was ready to receive data.
 */
#define IDEFLOPPY_PC_DELAY	(HZ/20)	/* default delay for ZIP 100 (50ms) */

static int ide_floppy_callback(ide_drive_t *drive, int dsc)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	struct ide_atapi_pc *pc = drive->pc;
	struct request *rq = pc->rq;
	int uptodate = pc->error ? 0 : 1;

	ide_debug_log(IDE_DBG_FUNC, "enter");

	if (drive->failed_pc == pc)
		drive->failed_pc = NULL;

	if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
	    rq->cmd_type == REQ_TYPE_BLOCK_PC)
		uptodate = 1; /* FIXME */
	else if (pc->c[0] == GPCMD_REQUEST_SENSE) {

		u8 *buf = bio_data(rq->bio);

		if (!pc->error) {
			floppy->sense_key = buf[2] & 0x0F;
			floppy->asc = buf[12];
			floppy->ascq = buf[13];
			floppy->progress_indication = buf[15] & 0x80 ?
				(u16)get_unaligned((u16 *)&buf[16]) : 0x10000;

			if (drive->failed_pc)
				ide_debug_log(IDE_DBG_PC, "pc = %x",
					      drive->failed_pc->c[0]);

			ide_debug_log(IDE_DBG_SENSE, "sense key = %x, asc = %x,"
				      "ascq = %x", floppy->sense_key,
				      floppy->asc, floppy->ascq);
		} else
			printk(KERN_ERR PFX "Error in REQUEST SENSE itself - "
			       "Aborting request!\n");
	}

	if (rq->cmd_type == REQ_TYPE_SPECIAL)
		rq->errors = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;

	return uptodate;
}

static void ide_floppy_report_error(struct ide_disk_obj *floppy,
				    struct ide_atapi_pc *pc)
{
	/* suppress error messages resulting from Medium not present */
	if (floppy->sense_key == 0x02 &&
	    floppy->asc       == 0x3a &&
	    floppy->ascq      == 0x00)
		return;

	printk(KERN_ERR PFX "%s: I/O error, pc = %2x, key = %2x, "
			"asc = %2x, ascq = %2x\n",