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