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/* 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 0xC
extern 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;
}
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