linux/tools/firewire/decode-fcp.c
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   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/firewire-constants.h>
   3#include <stdio.h>
   4#include <stdlib.h>
   5
   6#include "list.h"
   7#include "nosy-dump.h"
   8
   9#define CSR_FCP_COMMAND                 0xfffff0000b00ull
  10#define CSR_FCP_RESPONSE                0xfffff0000d00ull
  11
  12static const char * const ctype_names[] = {
  13        [0x0] = "control",              [0x8] = "not implemented",
  14        [0x1] = "status",               [0x9] = "accepted",
  15        [0x2] = "specific inquiry",     [0xa] = "rejected",
  16        [0x3] = "notify",               [0xb] = "in transition",
  17        [0x4] = "general inquiry",      [0xc] = "stable",
  18        [0x5] = "(reserved 0x05)",      [0xd] = "changed",
  19        [0x6] = "(reserved 0x06)",      [0xe] = "(reserved 0x0e)",
  20        [0x7] = "(reserved 0x07)",      [0xf] = "interim",
  21};
  22
  23static const char * const subunit_type_names[] = {
  24        [0x00] = "monitor",             [0x10] = "(reserved 0x10)",
  25        [0x01] = "audio",               [0x11] = "(reserved 0x11)",
  26        [0x02] = "printer",             [0x12] = "(reserved 0x12)",
  27        [0x03] = "disc",                [0x13] = "(reserved 0x13)",
  28        [0x04] = "tape recorder/player",[0x14] = "(reserved 0x14)",
  29        [0x05] = "tuner",               [0x15] = "(reserved 0x15)",
  30        [0x06] = "ca",                  [0x16] = "(reserved 0x16)",
  31        [0x07] = "camera",              [0x17] = "(reserved 0x17)",
  32        [0x08] = "(reserved 0x08)",     [0x18] = "(reserved 0x18)",
  33        [0x09] = "panel",               [0x19] = "(reserved 0x19)",
  34        [0x0a] = "bulletin board",      [0x1a] = "(reserved 0x1a)",
  35        [0x0b] = "camera storage",      [0x1b] = "(reserved 0x1b)",
  36        [0x0c] = "(reserved 0x0c)",     [0x1c] = "vendor unique",
  37        [0x0d] = "(reserved 0x0d)",     [0x1d] = "all subunit types",
  38        [0x0e] = "(reserved 0x0e)",     [0x1e] = "subunit_type extended to next byte",
  39        [0x0f] = "(reserved 0x0f)",     [0x1f] = "unit",
  40};
  41
  42struct avc_enum {
  43        int value;
  44        const char *name;
  45};
  46
  47struct avc_field {
  48        const char *name;       /* Short name for field. */
  49        int offset;             /* Location of field, specified in bits; */
  50                                /* negative means from end of packet.    */
  51        int width;              /* Width of field, 0 means use data_length. */
  52        struct avc_enum *names;
  53};
  54
  55struct avc_opcode_info {
  56        const char *name;
  57        struct avc_field fields[8];
  58};
  59
  60struct avc_enum power_field_names[] = {
  61        { 0x70, "on" },
  62        { 0x60, "off" },
  63        { }
  64};
  65
  66static const struct avc_opcode_info opcode_info[256] = {
  67
  68        /* TA Document 1999026 */
  69        /* AV/C Digital Interface Command Set General Specification 4.0 */
  70        [0xb2] = { "power", {
  71                        { "state", 0, 8, power_field_names }
  72                }
  73        },
  74        [0x30] = { "unit info", {
  75                        { "foo", 0, 8 },
  76                        { "unit_type", 8, 5 },
  77                        { "unit", 13, 3 },
  78                        { "company id", 16, 24 },
  79                }
  80        },
  81        [0x31] = { "subunit info" },
  82        [0x01] = { "reserve" },
  83        [0xb0] = { "version" },
  84        [0x00] = { "vendor dependent" },
  85        [0x02] = { "plug info" },
  86        [0x12] = { "channel usage" },
  87        [0x24] = { "connect" },
  88        [0x20] = { "connect av" },
  89        [0x22] = { "connections" },
  90        [0x11] = { "digital input" },
  91        [0x10] = { "digital output" },
  92        [0x25] = { "disconnect" },
  93        [0x21] = { "disconnect av" },
  94        [0x19] = { "input plug signal format" },
  95        [0x18] = { "output plug signal format" },
  96        [0x1f] = { "general bus setup" },
  97
  98        /* TA Document 1999025 */
  99        /* AV/C Descriptor Mechanism Specification Version 1.0 */
 100        [0x0c] = { "create descriptor" },
 101        [0x08] = { "open descriptor" },
 102        [0x09] = { "read descriptor" },
 103        [0x0a] = { "write descriptor" },
 104        [0x05] = { "open info block" },
 105        [0x06] = { "read info block" },
 106        [0x07] = { "write info block" },
 107        [0x0b] = { "search descriptor" },
 108        [0x0d] = { "object number select" },
 109
 110        /* TA Document 1999015 */
 111        /* AV/C Command Set for Rate Control of Isochronous Data Flow 1.0 */
 112        [0xb3] = { "rate", {
 113                        { "subfunction", 0, 8 },
 114                        { "result", 8, 8 },
 115                        { "plug_type", 16, 8 },
 116                        { "plug_id", 16, 8 },
 117                }
 118        },
 119
 120        /* TA Document 1999008 */
 121        /* AV/C Audio Subunit Specification 1.0 */
 122        [0xb8] = { "function block" },
 123
 124        /* TA Document 2001001 */
 125        /* AV/C Panel Subunit Specification 1.1 */
 126        [0x7d] = { "gui update" },
 127        [0x7e] = { "push gui data" },
 128        [0x7f] = { "user action" },
 129        [0x7c] = { "pass through" },
 130
 131        /* */
 132        [0x26] = { "asynchronous connection" },
 133};
 134
 135struct avc_frame {
 136        uint32_t operand0:8;
 137        uint32_t opcode:8;
 138        uint32_t subunit_id:3;
 139        uint32_t subunit_type:5;
 140        uint32_t ctype:4;
 141        uint32_t cts:4;
 142};
 143
 144static void
 145decode_avc(struct link_transaction *t)
 146{
 147        struct avc_frame *frame =
 148            (struct avc_frame *) t->request->packet.write_block.data;
 149        const struct avc_opcode_info *info;
 150        const char *name;
 151        char buffer[32];
 152        int i;
 153
 154        info = &opcode_info[frame->opcode];
 155        if (info->name == NULL) {
 156                snprintf(buffer, sizeof(buffer),
 157                         "(unknown opcode 0x%02x)", frame->opcode);
 158                name = buffer;
 159        } else {
 160                name = info->name;
 161        }
 162
 163        printf("av/c %s, subunit_type=%s, subunit_id=%d, opcode=%s",
 164            ctype_names[frame->ctype], subunit_type_names[frame->subunit_type],
 165            frame->subunit_id, name);
 166
 167        for (i = 0; info->fields[i].name != NULL; i++)
 168                printf(", %s", info->fields[i].name);
 169
 170        printf("\n");
 171}
 172
 173int
 174decode_fcp(struct link_transaction *t)
 175{
 176        struct avc_frame *frame =
 177            (struct avc_frame *) t->request->packet.write_block.data;
 178        unsigned long long offset =
 179            ((unsigned long long) t->request->packet.common.offset_high << 32) |
 180            t->request->packet.common.offset_low;
 181
 182        if (t->request->packet.common.tcode != TCODE_WRITE_BLOCK_REQUEST)
 183                return 0;
 184
 185        if (offset == CSR_FCP_COMMAND || offset == CSR_FCP_RESPONSE) {
 186                switch (frame->cts) {
 187                case 0x00:
 188                        decode_avc(t);
 189                        break;
 190                case 0x01:
 191                        printf("cal fcp frame (cts=0x01)\n");
 192                        break;
 193                case 0x02:
 194                        printf("ehs fcp frame (cts=0x02)\n");
 195                        break;
 196                case 0x03:
 197                        printf("havi fcp frame (cts=0x03)\n");
 198                        break;
 199                case 0x0e:
 200                        printf("vendor specific fcp frame (cts=0x0e)\n");
 201                        break;
 202                case 0x0f:
 203                        printf("extended cts\n");
 204                        break;
 205                default:
 206                        printf("reserved fcp frame (ctx=0x%02x)\n", frame->cts);
 207                        break;
 208                }
 209                return 1;
 210        }
 211
 212        return 0;
 213}
 214
 215