diff options
Diffstat (limited to 'drivers/usb/storage/karma.c')
| -rw-r--r-- | drivers/usb/storage/karma.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/usb/storage/karma.c b/drivers/usb/storage/karma.c new file mode 100644 index 000000000000..0d79ae5683f7 --- /dev/null +++ b/drivers/usb/storage/karma.c @@ -0,0 +1,155 @@ +/* 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; +} |