1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Driver for Rio Karma 4 * 5 * (c) 2006 Bob Copeland <me@bobcopeland.com> 6 * (c) 2006 Keith Bennett <keith@mcs.st-and.ac.uk> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/slab.h> 11 12 #include <scsi/scsi.h> 13 #include <scsi/scsi_cmnd.h> 14 #include <scsi/scsi_device.h> 15 16 #include "usb.h" 17 #include "transport.h" 18 #include "debug.h" 19 #include "scsiglue.h" 20 21 #define DRV_NAME "ums-karma" 22 23 MODULE_DESCRIPTION("Driver for Rio Karma"); 24 MODULE_AUTHOR("Bob Copeland <me@bobcopeland.com>, Keith Bennett <keith@mcs.st-and.ac.uk>"); 25 MODULE_LICENSE("GPL"); 26 27 #define RIO_PREFIX "RIOP\x00" 28 #define RIO_PREFIX_LEN 5 29 #define RIO_SEND_LEN 40 30 #define RIO_RECV_LEN 0x200 31 32 #define RIO_ENTER_STORAGE 0x1 33 #define RIO_LEAVE_STORAGE 0x2 34 #define RIO_RESET 0xC 35 36 struct karma_data { 37 int in_storage; 38 char *recv; 39 }; 40 41 static int rio_karma_init(struct us_data *us); 42 43 44 /* 45 * The table of devices 46 */ 47 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ 48 vendorName, productName, useProtocol, useTransport, \ 49 initFunction, flags) \ 50 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \ 51 .driver_info = (flags) } 52 53 static struct usb_device_id karma_usb_ids[] = { 54 # include "unusual_karma.h" 55 { } /* Terminating entry */ 56 }; 57 MODULE_DEVICE_TABLE(usb, karma_usb_ids); 58 59 #undef UNUSUAL_DEV 60 61 /* 62 * The flags table 63 */ 64 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \ 65 vendor_name, product_name, use_protocol, use_transport, \ 66 init_function, Flags) \ 67 { \ 68 .vendorName = vendor_name, \ 69 .productName = product_name, \ 70 .useProtocol = use_protocol, \ 71 .useTransport = use_transport, \ 72 .initFunction = init_function, \ 73 } 74 75 static struct us_unusual_dev karma_unusual_dev_list[] = { 76 # include "unusual_karma.h" 77 { } /* Terminating entry */ 78 }; 79 80 #undef UNUSUAL_DEV 81 82 83 /* 84 * Send commands to Rio Karma. 85 * 86 * For each command we send 40 bytes starting 'RIOP\0' followed by 87 * the command number and a sequence number, which the device will ack 88 * with a 512-byte packet with the high four bits set and everything 89 * else null. Then we send 'RIOP\x80' followed by a zero and the 90 * sequence number, until byte 5 in the response repeats the sequence 91 * number. 92 */ 93 static int rio_karma_send_command(char cmd, struct us_data *us) 94 { 95 int result; 96 unsigned long timeout; 97 static unsigned char seq = 1; 98 struct karma_data *data = (struct karma_data *) us->extra; 99 100 usb_stor_dbg(us, "sending command %04x\n", cmd); 101 memset(us->iobuf, 0, RIO_SEND_LEN); 102 memcpy(us->iobuf, RIO_PREFIX, RIO_PREFIX_LEN); 103 us->iobuf[5] = cmd; 104 us->iobuf[6] = seq; 105 106 timeout = jiffies + msecs_to_jiffies(6000); 107 for (;;) { 108 result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, 109 us->iobuf, RIO_SEND_LEN, NULL); 110 if (result != USB_STOR_XFER_GOOD) 111 goto err; 112 113 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 114 data->recv, RIO_RECV_LEN, NULL); 115 if (result != USB_STOR_XFER_GOOD) 116 goto err; 117 118 if (data->recv[5] == seq) 119 break; 120 121 if (time_after(jiffies, timeout)) 122 goto err; 123 124 us->iobuf[4] = 0x80; 125 us->iobuf[5] = 0; 126 msleep(50); 127 } 128 129 seq++; 130 if (seq == 0) 131 seq = 1; 132 133 usb_stor_dbg(us, "sent command %04x\n", cmd); 134 return 0; 135 err: 136 usb_stor_dbg(us, "command %04x failed\n", cmd); 137 return USB_STOR_TRANSPORT_FAILED; 138 } 139 140 /* 141 * Trap START_STOP and READ_10 to leave/re-enter storage mode. 142 * Everything else is propagated to the normal bulk layer. 143 */ 144 static int rio_karma_transport(struct scsi_cmnd *srb, struct us_data *us) 145 { 146 int ret; 147 struct karma_data *data = (struct karma_data *) us->extra; 148 149 if (srb->cmnd[0] == READ_10 && !data->in_storage) { 150 ret = rio_karma_send_command(RIO_ENTER_STORAGE, us); 151 if (ret) 152 return ret; 153 154 data->in_storage = 1; 155 return usb_stor_Bulk_transport(srb, us); 156 } else if (srb->cmnd[0] == START_STOP) { 157 ret = rio_karma_send_command(RIO_LEAVE_STORAGE, us); 158 if (ret) 159 return ret; 160 161 data->in_storage = 0; 162 return rio_karma_send_command(RIO_RESET, us); 163 } 164 return usb_stor_Bulk_transport(srb, us); 165 } 166 167 static void rio_karma_destructor(void *extra) 168 { 169 struct karma_data *data = (struct karma_data *) extra; 170 kfree(data->recv); 171 } 172 173 static int rio_karma_init(struct us_data *us) 174 { 175 int ret = 0; 176 struct karma_data *data = kzalloc(sizeof(struct karma_data), GFP_NOIO); 177 if (!data) 178 goto out; 179 180 data->recv = kmalloc(RIO_RECV_LEN, GFP_NOIO); 181 if (!data->recv) { 182 kfree(data); 183 goto out; 184 } 185 186 us->extra = data; 187 us->extra_destructor = rio_karma_destructor; 188 ret = rio_karma_send_command(RIO_ENTER_STORAGE, us); 189 data->in_storage = (ret == 0); 190 out: 191 return ret; 192 } 193 194 static struct scsi_host_template karma_host_template; 195 196 static int karma_probe(struct usb_interface *intf, 197 const struct usb_device_id *id) 198 { 199 struct us_data *us; 200 int result; 201 202 result = usb_stor_probe1(&us, intf, id, 203 (id - karma_usb_ids) + karma_unusual_dev_list, 204 &karma_host_template); 205 if (result) 206 return result; 207 208 us->transport_name = "Rio Karma/Bulk"; 209 us->transport = rio_karma_transport; 210 us->transport_reset = usb_stor_Bulk_reset; 211 212 result = usb_stor_probe2(us); 213 return result; 214 } 215 216 static struct usb_driver karma_driver = { 217 .name = DRV_NAME, 218 .probe = karma_probe, 219 .disconnect = usb_stor_disconnect, 220 .suspend = usb_stor_suspend, 221 .resume = usb_stor_resume, 222 .reset_resume = usb_stor_reset_resume, 223 .pre_reset = usb_stor_pre_reset, 224 .post_reset = usb_stor_post_reset, 225 .id_table = karma_usb_ids, 226 .soft_unbind = 1, 227 .no_dynamic_id = 1, 228 }; 229 230 module_usb_stor_driver(karma_driver, karma_host_template, DRV_NAME); 231