linux/tools/firewire/decode-fcp.c

#include <stdlib.h>
#include <stdio.h>
#include "list.h"
#include "nosy-dump.h"

#define CSR_FCP_COMMAND			0xfffff0000b00ull
#define CSR_FCP_RESPONSE		0xfffff0000d00ull

static const char * const ctype_names[16] = {
    "control",
    "status",
    "specific inquiry",
    "notify",
    "general inquiry",
    "(reserved 0x05)",
    "(reserved 0x06)",
    "(reserved 0x07)",
    "not implemented",
    "accepted",
    "rejected",
    "in transition",
    "stable",
    "changed",
    "(reserved 0x0e)",
    "interim"
};

static const char * const subunit_type_names[32] = {
    "monitor",
    "audio",
    "printer",
    "disc",
    "tape recorder/player",
    "tuner",
    "ca",
    "camera",
    "(reserved 0x08)",
    "panel",
    "bulletin board",
    "camera storage",
    "(reserved 0x0c)",
    "(reserved 0x0d)",
    "(reserved 0x0e)",
    "(reserved 0x0f)",
    "(reserved 0x10)",
    "(reserved 0x11)",
    "(reserved 0x12)",
    "(reserved 0x13)",
    "(reserved 0x14)",
    "(reserved 0x15)",
    "(reserved 0x16)",
    "(reserved 0x17)",
    "(reserved 0x18)",
    "(reserved 0x19)",
    "(reserved 0x1a)",
    "(reserved 0x1b)",
    "vendor unique",
    "all subunit types",
    "subunit_type extended to next byte",
    "unit"
};

struct avc_enum {
    int value;
    const char *name;
};

struct avc_field {
  const char *name;	/* Short name for field. */
  int offset;		/* Location of field, specified in bits.
			 * Negative means from end of packet */
  int width;		/* Width of field, 0 means use data_length. */
  struct avc_enum *names;
};

struct avc_opcode_info {
    const char *name;
    struct avc_field fields[8];
};

struct avc_enum power_field_names[] = {
    { 0x70, "on" },
    { 0x60, "off" },
    { }
};

static const struct avc_opcode_info opcode_info[256] = {

    /* TA Document 1999026
     * AV/C Digital Interface Command Set General Specification
     * Version 4.0 */
    [0xb2] =
    { "power", {
	    { "state", 0, 8, power_field_names }
	}
    },
    [0x30] =
    { "unit info", {
	    { "foo", 0, 8 },
	    { "unit_type", 8, 5 },
	    { "unit", 13, 3 },
	    { "company id", 16, 24 },
	}
    },
    [0x31] = { "subunit info" },
    [0x01] = { "reserve" },
    [0xb0] = { "version" },
    [0x00] = { "vendor dependent" },

    [0x02] = { "plug info" },
    [0x12] = { "channel usage" },
    [0x24] = { "connect" },
    [0x20] = { "connect av" },
    [0x22] = { "connections" },
    [0x11] = { "digital input" },
    [0x10] = { "digital output" },
    [0x25] = { "disconnect" },
    [0x21] = { "disconnect av" },
    [0x19] = { "input plug signal format" },
    [0x18] = { "output plug signal format" },
    [0x1f] = { "general bus setup" },

    /* TA Document 1999025
     * AV/C Descriptor Mechanism Specification Version 1.0 */
    [0x0c] = { "create descriptor" },
    [0x08] = { "open descriptor" },
    [0x09] = { "read descriptor" },
    [0x0a] = { "write descriptor" },
    [0x05] = { "open info block" },
    [0x06] = { "read info block" },
    [0x07] = { "write info block" },
    [0x0b] = { "search descriptor" },
    [0x0d] = { "object number select" },

    /* TA Document 1999015
     * AV/C Command Set for Rate Control of Isochronous Data Flow 1.0 */
    [0xb3] = { "rate", {
	    { "subfunction", 0, 8 },
	    { "result", 8, 8 },
	    { "plug_type", 16, 8 },
	    { "plug_id", 16, 8 },
	}
    },

    /* TA Document 1999008
     * AV/C Audio Subunit Specification 1.0 */
    [0xb8] = { "function block" },

    /* TA Document 2001001
     * AV/C Panel Subunit Specification 1.1 */
    [0x7d] = { "gui update" },
    [0x7e] = { "push gui data" },
    [0x7f] = { "user action" },
    [0x7c] = { "pass through" },

    /* */
    [0x26] = { "asynchronous connection" },
};

struct avc_frame {
    uint32_t operand0:8;
    uint32_t opcode:8;
    uint32_t subunit_id:3;
    uint32_t subunit_type:5;
    uint32_t ctype:4;
    uint32_t cts:4;
};

static void
decode_avc(struct link_transaction *t)
{
    struct avc_frame *frame = (struct avc_frame *) t->request->packet.write_block.data;
    const struct avc_opcode_info *info;
    const char *name;
    char buffer[32];
    int i;

    info = &opcode_info[frame->opcode];
    if (info->name == NULL) {
	snprintf(buffer, sizeof buffer, "(unknown opcode 0x%02x)", frame->opcode);
	name = buffer;
    } else {
	name = info->name;
    }

    printf("av/c %s, subunit_type=%s, subunit_id=%d, opcode=%s",
	   ctype_names[frame->ctype], subunit_type_names[frame->subunit_type],
	   frame->subunit_id, name);

    for (i = 0; info->fields[i].name != NULL; i++) {
	printf(", %s", info->fields[i].name);
    }

    printf("\n");
}


int
decode_fcp(struct link_transaction *t)
{
    struct avc_frame *frame = (struct avc_frame *) t->request->packet.write_block.data;
    unsigned long long offset;

    offset = ((unsigned long long) t->request->packet.common.offset_high << 32) |
	t->request->packet.common.offset_low;

    if (t->request->packet.common.tcode != TCODE_WRITE_BLOCK)
	return 0;

    if (offset == CSR_FCP_COMMAND || offset == CSR_FCP_RESPONSE) {
	switch (frame->cts) {
	case 0x00:
	    decode_avc(t);
	    break;
	case 0x01:
	    printf("cal fcp frame (cts=0x01)\n");
	    break;
	case 0x02:
	    printf("ehs fcp frame (cts=0x02)\n");
	    break;
	case 0x03:
	    printf("havi fcp frame (cts=0x03)\n");
	    break;
	case 0x0e:
	    printf("vendor specific fcp frame (cts=0x0e)\n");
	    break;
	case 0x0f:
	    printf("extended cts\n");
	    break;
	default:
	    printf("reserved fcp frame (ctx=0x%02x)\n", frame->cts);
	    break;
	}
	return 1;
    }

    return 0;
}