path: root/drivers/ide/ide-floppy.c

/*
 * 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
 */

#define DRV_NAME "ide-floppy"

#define IDEFLOPPY_VERSION "1.00"

#include <linux/module.h>
#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/slab.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/irq.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/unaligned.h>

#include "ide-floppy.h"

/* define to see debug info */
#define IDEFLOPPY_DEBUG_LOG		0

/* #define IDEFLOPPY_DEBUG(fmt, args...) printk(KERN_INFO fmt, ## args) */
#define IDEFLOPPY_DEBUG(fmt, args...)

#if IDEFLOPPY_DEBUG_LOG
#define debug_log(fmt, args...) \
	printk(KERN_INFO "ide-floppy: " fmt, ## args)
#else
#define debug_log(fmt, args...) do {} while (0)
#endif


/* Some drives require a longer irq timeout. */
#define IDEFLOPPY_WAIT_CMD		(5 * WAIT_CMD)

/*
 * 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

#define IDEFLOPPY_TICKS_DELAY	HZ/20	/* default delay for ZIP 100 (50ms) */

/* Error code returned in rq->errors to the higher part of the driver. */
#define	IDEFLOPPY_ERROR_GENERAL		101

static DEFINE_MUTEX(idefloppy_ref_mutex);

#define to_ide_floppy(obj) container_of(obj, struct ide_floppy_obj, kref)

#define ide_floppy_g(disk) \
	container_of((disk)->private_data, struct ide_floppy_obj, driver)

static void idefloppy_cleanup_obj(struct kref *);

static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
{
	struct ide_floppy_obj *floppy = NULL;

	mutex_lock(&idefloppy_ref_mutex);
	floppy = ide_floppy_g(disk);
	if (floppy) {
		if (ide_device_get(floppy->drive))
			floppy = NULL;
		else
			kref_get(&floppy->kref);
	}
	mutex_unlock(&idefloppy_ref_mutex);
	return floppy;
}

static void ide_floppy_put(struct ide_floppy_obj *floppy)
{
	ide_drive_t *drive = floppy->drive;

	mutex_lock(&idefloppy_ref_mutex);
	kref_put(&floppy->kref, idefloppy_cleanup_obj);
	ide_device_put(drive);
	mutex_unlock(&idefloppy_ref_mutex);
}

/*
 * Used to finish servicing a request. For read/write requests, we will call
 * ide_end_request to pass to the next buffer.
 */
static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct request *rq = HWGROUP(drive)->rq;
	int error;

	debug_log("Reached %s\n", __func__);

	switch (uptodate) {
	case 0: error = IDEFLOPPY_ERROR_GENERAL; break;
	case 1: error = 0; break;
	default: error = uptodate;
	}
	if (error)
		floppy->failed_pc = NULL;
	/* Why does this happen? */
	if (!rq)
		return 0;
	if (!blk_special_request(rq)) {
		/* our real local end request function */
		ide_end_request(drive, uptodate, nsecs);
		return 0;
	}
	rq->errors = error;
	/* fixme: need to move this local also */
	ide_end_drive_cmd(drive, 0, 0);
	return 0;
}

static void idefloppy_update_buffers(ide_drive_t *drive,
				struct ide_atapi_pc *pc)
{
	struct request *rq = pc->rq;
	struct bio *bio = rq->bio;

	while ((bio = rq->bio) != NULL)
		idefloppy_end_request(drive, 1, 0);
}

static void ide_floppy_callback(ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct ide_atapi_pc *pc = floppy->pc;
	int uptodate = pc->error ? 0 : 1;

	debug_log("Reached %s\n", __func__);

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

	if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
	    (pc->rq && blk_pc_request(pc->rq)))
		uptodate = 1; /* FIXME */
	else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
		u8 *buf = floppy->pc->buf;

		if (!pc->error) {
			floppy->sense_key = buf[2]