1 /* Driver for Rio Karma 2 * 3 * (c) 2006 Bob Copeland <me@bobcopeland.com> 4 * (c) 2006 Keith Bennett <keith@mcs.st-and.ac.uk> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2, or (at your option) any 9 * later version. 10 * 11 * This program is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 675 Mass Ave, Cambridge, MA 02139, USA. 19 */ 20 21 #include <scsi/scsi.h> 22 #include <scsi/scsi_cmnd.h> 23 #include <scsi/scsi_device.h> 24 25 #include "usb.h" 26 #include "transport.h" 27 #include "debug.h" 28 #include "karma.h" 29 30 #define RIO_PREFIX "RIOP\x00" 31 #define RIO_PREFIX_LEN 5 32 #define RIO_SEND_LEN 40 33 #define RIO_RECV_LEN 0x200 34 35 #define RIO_ENTER_STORAGE 0x1 36 #define RIO_LEAVE_STORAGE 0x2 37 #define RIO_RESET 0xC 38 39 extern int usb_stor_Bulk_transport(struct scsi_cmnd *, struct us_data *); 40 41 struct karma_data { 42 int in_storage; 43 char *recv; 44 }; 45 46 /* 47 * Send commands to Rio Karma. 48 * 49 * For each command we send 40 bytes starting 'RIOP\0' followed by 50 * the command number and a sequence number, which the device will ack 51 * with a 512-byte packet with the high four bits set and everything 52 * else null. Then we send 'RIOP\x80' followed by a zero and the 53 * sequence number, until byte 5 in the response repeats the sequence 54 * number. 55 */ 56 static int rio_karma_send_command(char cmd, struct us_data *us) 57 { 58 int result, partial; 59 unsigned long timeout; 60 static unsigned char seq = 1; 61 struct karma_data *data = (struct karma_data *) us->extra; 62 63 US_DEBUGP("karma: sending command %04x\n", cmd); 64 memset(us->iobuf, 0, RIO_SEND_LEN); 65 memcpy(us->iobuf, RIO_PREFIX, RIO_PREFIX_LEN); 66 us->iobuf[5] = cmd; 67 us->iobuf[6] = seq; 68 69 timeout = jiffies + msecs_to_jiffies(6000); 70 for (;;) { 71 result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, 72 us->iobuf, RIO_SEND_LEN, &partial); 73 if (result != USB_STOR_XFER_GOOD) 74 goto err; 75 76 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 77 data->recv, RIO_RECV_LEN, &partial); 78 if (result != USB_STOR_XFER_GOOD) 79 goto err; 80 81 if (data->recv[5] == seq) 82 break; 83 84 if (time_after(jiffies, timeout)) 85 goto err; 86 87 us->iobuf[4] = 0x80; 88 us->iobuf[5] = 0; 89 msleep(50); 90 } 91 92 seq++; 93 if (seq == 0) 94 seq = 1; 95 96 US_DEBUGP("karma: sent command %04x\n", cmd); 97 return 0; 98 err: 99 US_DEBUGP("karma: command %04x failed\n", cmd); 100 return USB_STOR_TRANSPORT_FAILED; 101 } 102 103 /* 104 * Trap START_STOP and READ_10 to leave/re-enter storage mode. 105 * Everything else is propagated to the normal bulk layer. 106 */ 107 int rio_karma_transport(struct scsi_cmnd *srb, struct us_data *us) 108 { 109 int ret; 110 struct karma_data *data = (struct karma_data *) us->extra; 111 112 if (srb->cmnd[0] == READ_10 && !data->in_storage) { 113 ret = rio_karma_send_command(RIO_ENTER_STORAGE, us); 114 if (ret) 115 return ret; 116 117 data->in_storage = 1; 118 return usb_stor_Bulk_transport(srb, us); 119 } else if (srb->cmnd[0] == START_STOP) { 120 ret = rio_karma_send_command(RIO_LEAVE_STORAGE, us); 121 if (ret) 122 return ret; 123 124 data->in_storage = 0; 125 return rio_karma_send_command(RIO_RESET, us); 126 } 127 return usb_stor_Bulk_transport(srb, us); 128 } 129 130 static void rio_karma_destructor(void *extra) 131 { 132 struct karma_data *data = (struct karma_data *) extra; 133 kfree(data->recv); 134 } 135 136 int rio_karma_init(struct us_data *us) 137 { 138 int ret = 0; 139 struct karma_data *data = kzalloc(sizeof(struct karma_data), GFP_NOIO); 140 if (!data) 141 goto out; 142 143 data->recv = kmalloc(RIO_RECV_LEN, GFP_NOIO); 144 if (!data->recv) { 145 kfree(data); 146 goto out; 147 } 148 149 us->extra = data; 150 us->extra_destructor = rio_karma_destructor; 151 ret = rio_karma_send_command(RIO_ENTER_STORAGE, us); 152 data->in_storage = (ret == 0); 153 out: 154 return ret; 155 } 156