/* Driver for Rio Karma * *   (c) 2006 Bob Copeland <me@bobcopeland.com> *   (c) 2006 Keith Bennett <keith@mcs.st-and.ac.uk> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. */#include <scsi/scsi.h>#include <scsi/scsi_cmnd.h>#include <scsi/scsi_device.h>#include "usb.h"#include "transport.h"#include "debug.h"#include "karma.h"#define RIO_PREFIX "RIOP\x00"#define RIO_PREFIX_LEN 5#define RIO_SEND_LEN 40#define RIO_RECV_LEN 0x200#define RIO_ENTER_STORAGE 0x1#define RIO_LEAVE_STORAGE 0x2#define RIO_RESET 0xCextern int usb_stor_Bulk_transport(struct scsi_cmnd *, struct us_data *);struct karma_data {	int in_storage;	char *recv;};/* * Send commands to Rio Karma. * * For each command we send 40 bytes starting 'RIOP\0' followed by * the command number and a sequence number, which the device will ack * with a 512-byte packet with the high four bits set and everything * else null.  Then we send 'RIOP\x80' followed by a zero and the * sequence number, until byte 5 in the response repeats the sequence * number. */static int rio_karma_send_command(char cmd, struct us_data *us){	int result, partial;	unsigned long timeout;	static unsigned char seq = 1;	struct karma_data *data = (struct karma_data *) us->extra;	US_DEBUGP("karma: sending command %04x\n", cmd);	memset(us->iobuf, 0, RIO_SEND_LEN);	memcpy(us->iobuf, RIO_PREFIX, RIO_PREFIX_LEN);	us->iobuf[5] = cmd;	us->iobuf[6] = seq;	timeout = jiffies + msecs_to_jiffies(6000);	for (;;) {		result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,			us->iobuf, RIO_SEND_LEN, &partial);		if (result != USB_STOR_XFER_GOOD)			goto err;		result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,			data->recv, RIO_RECV_LEN, &partial);		if (result != USB_STOR_XFER_GOOD)			goto err;		if (data->recv[5] == seq)			break;		if (time_after(jiffies, timeout))			goto err;		us->iobuf[4] = 0x80;		us->iobuf[5] = 0;		msleep(50);	}	seq++;	if (seq == 0)		seq = 1;	US_DEBUGP("karma: sent command %04x\n", cmd);	return 0;err:	US_DEBUGP("karma: command %04x failed\n", cmd);	return USB_STOR_TRANSPORT_FAILED;}/* * Trap START_STOP and READ_10 to leave/re-enter storage mode. * Everything else is propagated to the normal bulk layer. */int rio_karma_transport(struct scsi_cmnd *srb, struct us_data *us){	int ret;	struct karma_data *data = (struct karma_data *) us->extra;	if (srb->cmnd[0] == READ_10 && !data->in_storage) {		ret = rio_karma_send_command(RIO_ENTER_STORAGE, us);		if (ret)			return ret;		data->in_storage = 1;		return usb_stor_Bulk_transport(srb, us);	} else if (srb->cmnd[0] == START_STOP) {		ret = rio_karma_send_command(RIO_LEAVE_STORAGE, us);		if (ret)			return ret;		data->in_storage = 0;		return rio_karma_send_command(RIO_RESET, us);	}	return usb_stor_Bulk_transport(srb, us);}static void rio_karma_destructor(void *extra){	struct karma_data *data = (struct karma_data *) extra;	kfree(data->recv);}int rio_karma_init(struct us_data *us){	int ret = 0;	struct karma_data *data = kzalloc(sizeof(struct karma_data), GFP_NOIO);	if (!data)		goto out;	data->recv = kmalloc(RIO_RECV_LEN, GFP_NOIO);	if (!data->recv) {		kfree(data);		goto out;	}	us->extra = data;	us->extra_destructor = rio_karma_destructor;	ret = rio_karma_send_command(RIO_ENTER_STORAGE, us);	data->in_storage = (ret == 0);out:	return ret;}