firedtv-avc.c

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/*
 * FireDTV driver (formerly known as FireSAT)
 *
 * Copyright (C) 2004 Andreas Monitzer <[email protected]>
 * Copyright (C) 2008 Ben Backx <[email protected]>
 * Copyright (C) 2008 Henrik Kurelid <[email protected]>
 *
 *  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 of
 *  the License, or (at your option) any later version.
 */

#include <linux/bug.h>
#include <linux/crc32.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/string.h>
#include <linux/stringify.h>
#include <linux/wait.h>
#include <linux/workqueue.h>

#include <dvb_frontend.h>

#include "firedtv.h"

#define FCP_COMMAND_REGISTER        0xfffff0000b00ULL

#define AVC_CTYPE_CONTROL       0x0
#define AVC_CTYPE_STATUS        0x1
#define AVC_CTYPE_NOTIFY        0x3

#define AVC_RESPONSE_ACCEPTED       0x9
#define AVC_RESPONSE_STABLE     0xc
#define AVC_RESPONSE_CHANGED        0xd
#define AVC_RESPONSE_INTERIM        0xf

#define AVC_SUBUNIT_TYPE_TUNER      (0x05 << 3)
#define AVC_SUBUNIT_TYPE_UNIT       (0x1f << 3)

#define AVC_OPCODE_VENDOR       0x00
#define AVC_OPCODE_READ_DESCRIPTOR  0x09
#define AVC_OPCODE_DSIT         0xc8
#define AVC_OPCODE_DSD          0xcb

#define DESCRIPTOR_TUNER_STATUS     0x80
#define DESCRIPTOR_SUBUNIT_IDENTIFIER   0x00

#define SFE_VENDOR_DE_COMPANYID_0   0x00 /* OUI of Digital Everywhere */
#define SFE_VENDOR_DE_COMPANYID_1   0x12
#define SFE_VENDOR_DE_COMPANYID_2   0x87

#define SFE_VENDOR_OPCODE_REGISTER_REMOTE_CONTROL 0x0a
#define SFE_VENDOR_OPCODE_LNB_CONTROL       0x52
#define SFE_VENDOR_OPCODE_TUNE_QPSK     0x58 /* for DVB-S */

#define SFE_VENDOR_OPCODE_GET_FIRMWARE_VERSION  0x00
#define SFE_VENDOR_OPCODE_HOST2CA       0x56
#define SFE_VENDOR_OPCODE_CA2HOST       0x57
#define SFE_VENDOR_OPCODE_CISTATUS      0x59
#define SFE_VENDOR_OPCODE_TUNE_QPSK2        0x60 /* for DVB-S2 */

#define SFE_VENDOR_TAG_CA_RESET         0x00
#define SFE_VENDOR_TAG_CA_APPLICATION_INFO  0x01
#define SFE_VENDOR_TAG_CA_PMT           0x02
#define SFE_VENDOR_TAG_CA_DATE_TIME     0x04
#define SFE_VENDOR_TAG_CA_MMI           0x05
#define SFE_VENDOR_TAG_CA_ENTER_MENU        0x07

#define EN50221_LIST_MANAGEMENT_ONLY    0x03
#define EN50221_TAG_APP_INFO        0x9f8021
#define EN50221_TAG_CA_INFO     0x9f8031

struct avc_command_frame {
    u8 ctype;
    u8 subunit;
    u8 opcode;
    u8 operand[509];
};

struct avc_response_frame {
    u8 response;
    u8 subunit;
    u8 opcode;
    u8 operand[509];
};

#define LAST_OPERAND (509 - 1)

static inline void clear_operands(struct avc_command_frame *c, int from, int to)
{
    memset(&c->operand[from], 0, to - from + 1);
}

static void pad_operands(struct avc_command_frame *c, int from)
{
    int to = ALIGN(from, 4);

    if (from <= to && to <= LAST_OPERAND)
        clear_operands(c, from, to);
}

#define AVC_DEBUG_READ_DESCRIPTOR              0x0001
#define AVC_DEBUG_DSIT                         0x0002
#define AVC_DEBUG_DSD                          0x0004
#define AVC_DEBUG_REGISTER_REMOTE_CONTROL      0x0008
#define AVC_DEBUG_LNB_CONTROL                  0x0010
#define AVC_DEBUG_TUNE_QPSK                    0x0020
#define AVC_DEBUG_TUNE_QPSK2                   0x0040
#define AVC_DEBUG_HOST2CA                      0x0080
#define AVC_DEBUG_CA2HOST                      0x0100
#define AVC_DEBUG_APPLICATION_PMT              0x4000
#define AVC_DEBUG_FCP_PAYLOADS                 0x8000

static int avc_debug;
module_param_named(debug, avc_debug, int, 0644);
MODULE_PARM_DESC(debug, "Verbose logging (none = 0"
    ", FCP subactions"
    ": READ DESCRIPTOR = "      __stringify(AVC_DEBUG_READ_DESCRIPTOR)
    ", DSIT = "         __stringify(AVC_DEBUG_DSIT)
    ", REGISTER_REMOTE_CONTROL = "  __stringify(AVC_DEBUG_REGISTER_REMOTE_CONTROL)
    ", LNB CONTROL = "      __stringify(AVC_DEBUG_LNB_CONTROL)
    ", TUNE QPSK = "        __stringify(AVC_DEBUG_TUNE_QPSK)
    ", TUNE QPSK2 = "       __stringify(AVC_DEBUG_TUNE_QPSK2)
    ", HOST2CA = "          __stringify(AVC_DEBUG_HOST2CA)
    ", CA2HOST = "          __stringify(AVC_DEBUG_CA2HOST)
    "; Application sent PMT = " __stringify(AVC_DEBUG_APPLICATION_PMT)
    ", FCP payloads = "     __stringify(AVC_DEBUG_FCP_PAYLOADS)
    ", or a combination, or all = -1)");

/*
 * This is a workaround since there is no vendor specific command to retrieve
 * ca_info using AVC. If this parameter is not used, ca_system_id will be
 * filled with application_manufacturer from ca_app_info.
 * Digital Everywhere have said that adding ca_info is on their TODO list.
 */
static unsigned int num_fake_ca_system_ids;
static int fake_ca_system_ids[4] = { -1, -1, -1, -1 };
module_param_array(fake_ca_system_ids, int, &num_fake_ca_system_ids, 0644);
MODULE_PARM_DESC(fake_ca_system_ids, "If your CAM application manufacturer "
         "does not have the same ca_system_id as your CAS, you can "
         "override what ca_system_ids are presented to the "
         "application by setting this field to an array of ids.");

static const char *debug_fcp_ctype(unsigned int ctype)
{
    static const char *ctypes[] = {
        [0x0] = "CONTROL",      [0x1] = "STATUS",
        [0x2] = "SPECIFIC INQUIRY", [0x3] = "NOTIFY",
        [0x4] = "GENERAL INQUIRY",  [0x8] = "NOT IMPLEMENTED",
        [0x9] = "ACCEPTED",     [0xa] = "REJECTED",
        [0xb] = "IN TRANSITION",    [0xc] = "IMPLEMENTED/STABLE",
        [0xd] = "CHANGED",      [0xf] = "INTERIM",
    };
    const char *ret = ctype < ARRAY_SIZE(ctypes) ? ctypes[ctype] : NULL;

    return ret ? ret : "?";
}

static const char *debug_fcp_opcode(unsigned int opcode,
                    const u8 *data, int length)
{
    switch (opcode) {
    case AVC_OPCODE_VENDOR:
        break;
    case AVC_OPCODE_READ_DESCRIPTOR:
        return avc_debug & AVC_DEBUG_READ_DESCRIPTOR ?
                "ReadDescriptor" : NULL;
    case AVC_OPCODE_DSIT:
        return avc_debug & AVC_DEBUG_DSIT ?
                "DirectSelectInfo.Type" : NULL;
    case AVC_OPCODE_DSD:
        return avc_debug & AVC_DEBUG_DSD ? "DirectSelectData" : NULL;
    default:
        return "Unknown";
    }

    if (length < 7 ||
        data[3] != SFE_VENDOR_DE_COMPANYID_0 ||
        data[4] != SFE_VENDOR_DE_COMPANYID_1 ||
        data[5] != SFE_VENDOR_DE_COMPANYID_2)
        return "Vendor/Unknown";

    switch (data[6]) {
    case SFE_VENDOR_OPCODE_REGISTER_REMOTE_CONTROL:
        return avc_debug & AVC_DEBUG_REGISTER_REMOTE_CONTROL ?
                "RegisterRC" : NULL;
    case SFE_VENDOR_OPCODE_LNB_CONTROL:
        return avc_debug & AVC_DEBUG_LNB_CONTROL ? "LNBControl" : NULL;
    case SFE_VENDOR_OPCODE_TUNE_QPSK:
        return avc_debug & AVC_DEBUG_TUNE_QPSK ? "TuneQPSK" : NULL;
    case SFE_VENDOR_OPCODE_TUNE_QPSK2:
        return avc_debug & AVC_DEBUG_TUNE_QPSK2 ? "TuneQPSK2" : NULL;
    case SFE_VENDOR_OPCODE_HOST2CA:
        return avc_debug & AVC_DEBUG_HOST2CA ? "Host2CA" : NULL;
    case SFE_VENDOR_OPCODE_CA2HOST:
        return avc_debug & AVC_DEBUG_CA2HOST ? "CA2Host" : NULL;
    }
    return "Vendor/Unknown";
}

static void debug_fcp(const u8 *data, int length)
{
    unsigned int subunit_type, subunit_id, opcode;
    const char *op, *prefix;

    prefix       = data[0] > 7 ? "FCP <- " : "FCP -> ";
    subunit_type = data[1] >> 3;
    subunit_id   = data[1] & 7;
    opcode       = subunit_type == 0x1e || subunit_id == 5 ? ~0 : data[2];
    op           = debug_fcp_opcode(opcode, data, length);

    if (op) {
        printk(KERN_INFO "%ssu=%x.%x l=%d: %-8s - %s\n",
               prefix, subunit_type, subunit_id, length,
               debug_fcp_ctype(data[0]), op);
        if (avc_debug & AVC_DEBUG_FCP_PAYLOADS)
            print_hex_dump(KERN_INFO, prefix, DUMP_PREFIX_NONE,
                       16, 1, data, length, false);
    }
}

static void debug_pmt(char *msg, int length)
{
    printk(KERN_INFO "APP PMT -> l=%d\n", length);
    print_hex_dump(KERN_INFO, "APP PMT -> ", DUMP_PREFIX_NONE,
               16, 1, msg, length, false);
}

static int avc_write(struct firedtv *fdtv)
{
    int err, retry;

    fdtv->avc_reply_received = false;

    for (retry = 0; retry < 6; retry++) {
        if (unlikely(avc_debug))
            debug_fcp(fdtv->avc_data, fdtv->avc_data_length);

        err = fdtv_write(fdtv, FCP_COMMAND_REGISTER,
                 fdtv->avc_data, fdtv->avc_data_length);
        if (err) {
            dev_err(fdtv->device, "FCP command write failed\n");

            return err;
        }

        /*
         * AV/C specs say that answers should be sent within 150 ms.
         * Time out after 200 ms.
         */
        if (wait_event_timeout(fdtv->avc_wait,
                       fdtv->avc_reply_received,
                       msecs_to_jiffies(200)) != 0)
            return 0;
    }
    dev_err(fdtv->device, "FCP response timed out\n");

    return -ETIMEDOUT;
}

static bool is_register_rc(struct avc_response_frame *r)
{
    return r->opcode     == AVC_OPCODE_VENDOR &&
           r->operand[0] == SFE_VENDOR_DE_COMPANYID_0 &&
           r->operand[1] == SFE_VENDOR_DE_COMPANYID_1 &&
           r->operand[2] == SFE_VENDOR_DE_COMPANYID_2 &&
           r->operand[3] == SFE_VENDOR_OPCODE_REGISTER_REMOTE_CONTROL;
}

int avc_recv(struct firedtv *fdtv, void *data, size_t length)
{
    struct avc_response_frame *r = data;

    if (unlikely(avc_debug))
        debug_fcp(data, length);

    if (length >= 8 && is_register_rc(r)) {
        switch (r->response) {
        case AVC_RESPONSE_CHANGED:
            fdtv_handle_rc(fdtv, r->operand[4] << 8 | r->operand[5]);
            schedule_work(&fdtv->remote_ctrl_work);
            break;
        case AVC_RESPONSE_INTERIM:
            if (is_register_rc((void *)fdtv->avc_data))
                goto wake;
            break;
        default:
            dev_info(fdtv->device,
                 "remote control result = %d\n", r->response);
        }
        return 0;
    }

    if (fdtv->avc_reply_received) {
        dev_err(fdtv->device, "out-of-order AVC response, ignored\n");
        return -EIO;
    }

    memcpy(fdtv->avc_data, data, length);
    fdtv->avc_data_length = length;
wake:
    fdtv->avc_reply_received = true;
    wake_up(&fdtv->avc_wait);

    return 0;
}

static int add_pid_filter(struct firedtv *fdtv, u8 *operand)
{
    int i, n, pos = 1;

    for (i = 0, n = 0; i < 16; i++) {
        if (test_bit(i, &fdtv->channel_active)) {
            operand[pos++] = 0x13; /* flowfunction relay */
            operand[pos++] = 0x80; /* dsd_sel_spec_valid_flags -> PID */
            operand[pos++] = (fdtv->channel_pid[i] >> 8) & 0x1f;
            operand[pos++] = fdtv->channel_pid[i] & 0xff;
            operand[pos++] = 0x00; /* tableID */
            operand[pos++] = 0x00; /* filter_length */
            n++;
        }
    }
    operand[0] = n;

    return pos;
}

/*
 * tuning command for setting the relative LNB frequency
 * (not supported by the AVC standard)
 */
static int avc_tuner_tuneqpsk(struct firedtv *fdtv,
                  struct dtv_frontend_properties *p)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;

    c->opcode = AVC_OPCODE_VENDOR;

    c->operand[0] = SFE_VENDOR_DE_COMPANYID_0;
    c->operand[1] = SFE_VENDOR_DE_COMPANYID_1;
    c->operand[2] = SFE_VENDOR_DE_COMPANYID_2;
    if (fdtv->type == FIREDTV_DVB_S2)
        c->operand[3] = SFE_VENDOR_OPCODE_TUNE_QPSK2;
    else
        c->operand[3] = SFE_VENDOR_OPCODE_TUNE_QPSK;

    c->operand[4] = (p->frequency >> 24) & 0xff;
    c->operand[5] = (p->frequency >> 16) & 0xff;
    c->operand[6] = (p->frequency >> 8) & 0xff;
    c->operand[7] = p->frequency & 0xff;

    c->operand[8] = ((p->symbol_rate / 1000) >> 8) & 0xff;
    c->operand[9] = (p->symbol_rate / 1000) & 0xff;

    switch (p->fec_inner) {
    case FEC_1_2:   c->operand[10] = 0x1; break;
    case FEC_2_3:   c->operand[10] = 0x2; break;
    case FEC_3_4:   c->operand[10] = 0x3; break;
    case FEC_5_6:   c->operand[10] = 0x4; break;
    case FEC_7_8:   c->operand[10] = 0x5; break;
    case FEC_4_5:
    case FEC_8_9:
    case FEC_AUTO:
    default:    c->operand[10] = 0x0;
    }

    if (fdtv->voltage == 0xff)
        c->operand[11] = 0xff;
    else if (fdtv->voltage == SEC_VOLTAGE_18) /* polarisation */
        c->operand[11] = 0;
    else
        c->operand[11] = 1;

    if (fdtv->tone == 0xff)
        c->operand[12] = 0xff;
    else if (fdtv->tone == SEC_TONE_ON) /* band */
        c->operand[12] = 1;
    else
        c->operand[12] = 0;

    if (fdtv->type == FIREDTV_DVB_S2) {
        if (fdtv->fe.dtv_property_cache.delivery_system == SYS_DVBS2) {
            switch (fdtv->fe.dtv_property_cache.modulation) {
            case QAM_16:        c->operand[13] = 0x1; break;
            case QPSK:      c->operand[13] = 0x2; break;
            case PSK_8:     c->operand[13] = 0x3; break;
            default:        c->operand[13] = 0x2; break;
            }
            switch (fdtv->fe.dtv_property_cache.rolloff) {
            case ROLLOFF_35:    c->operand[14] = 0x2; break;
            case ROLLOFF_20:    c->operand[14] = 0x0; break;
            case ROLLOFF_25:    c->operand[14] = 0x1; break;
            case ROLLOFF_AUTO:
            default:        c->operand[14] = 0x2; break;
            /* case ROLLOFF_NONE:   c->operand[14] = 0xff; break; */
            }
            switch (fdtv->fe.dtv_property_cache.pilot) {
            case PILOT_AUTO:    c->operand[15] = 0x0; break;
            case PILOT_OFF:     c->operand[15] = 0x0; break;
            case PILOT_ON:      c->operand[15] = 0x1; break;
            }
        } else {
            c->operand[13] = 0x1;  /* auto modulation */
            c->operand[14] = 0xff; /* disable rolloff */
            c->operand[15] = 0xff; /* disable pilot */
        }
        return 16;
    } else {
        return 13;
    }
}

static int avc_tuner_dsd_dvb_c(struct firedtv *fdtv,
                   struct dtv_frontend_properties *p)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;

    c->opcode = AVC_OPCODE_DSD;

    c->operand[0] = 0;    /* source plug */
    c->operand[1] = 0xd2; /* subfunction replace */
    c->operand[2] = 0x20; /* system id = DVB */
    c->operand[3] = 0x00; /* antenna number */
    c->operand[4] = 0x11; /* system_specific_multiplex selection_length */

    /* multiplex_valid_flags, high byte */
    c->operand[5] =   0 << 7 /* reserved */
            | 0 << 6 /* Polarisation */
            | 0 << 5 /* Orbital_Pos */
            | 1 << 4 /* Frequency */
            | 1 << 3 /* Symbol_Rate */
            | 0 << 2 /* FEC_outer */
            | (p->fec_inner  != FEC_AUTO ? 1 << 1 : 0)
            | (p->modulation != QAM_AUTO ? 1 << 0 : 0);

    /* multiplex_valid_flags, low byte */
    c->operand[6] =   0 << 7 /* NetworkID */
            | 0 << 0 /* reserved */ ;

    c->operand[7]  = 0x00;
    c->operand[8]  = 0x00;
    c->operand[9]  = 0x00;
    c->operand[10] = 0x00;

    c->operand[11] = (((p->frequency / 4000) >> 16) & 0xff) | (2 << 6);
    c->operand[12] = ((p->frequency / 4000) >> 8) & 0xff;
    c->operand[13] = (p->frequency / 4000) & 0xff;
    c->operand[14] = ((p->symbol_rate / 1000) >> 12) & 0xff;
    c->operand[15] = ((p->symbol_rate / 1000) >> 4) & 0xff;
    c->operand[16] = ((p->symbol_rate / 1000) << 4) & 0xf0;
    c->operand[17] = 0x00;

    switch (p->fec_inner) {
    case FEC_1_2:   c->operand[18] = 0x1; break;
    case FEC_2_3:   c->operand[18] = 0x2; break;
    case FEC_3_4:   c->operand[18] = 0x3; break;
    case FEC_5_6:   c->operand[18] = 0x4; break;
    case FEC_7_8:   c->operand[18] = 0x5; break;
    case FEC_8_9:   c->operand[18] = 0x6; break;
    case FEC_4_5:   c->operand[18] = 0x8; break;
    case FEC_AUTO:
    default:    c->operand[18] = 0x0;
    }

    switch (p->modulation) {
    case QAM_16:    c->operand[19] = 0x08; break;
    case QAM_32:    c->operand[19] = 0x10; break;
    case QAM_64:    c->operand[19] = 0x18; break;
    case QAM_128:   c->operand[19] = 0x20; break;
    case QAM_256:   c->operand[19] = 0x28; break;
    case QAM_AUTO:
    default:    c->operand[19] = 0x00;
    }

    c->operand[20] = 0x00;
    c->operand[21] = 0x00;

    return 22 + add_pid_filter(fdtv, &c->operand[22]);
}

static int avc_tuner_dsd_dvb_t(struct firedtv *fdtv,
                   struct dtv_frontend_properties *p)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;

    c->opcode = AVC_OPCODE_DSD;

    c->operand[0] = 0;    /* source plug */
    c->operand[1] = 0xd2; /* subfunction replace */
    c->operand[2] = 0x20; /* system id = DVB */
    c->operand[3] = 0x00; /* antenna number */
    c->operand[4] = 0x0c; /* system_specific_multiplex selection_length */

    /* multiplex_valid_flags, high byte */
    c->operand[5] =
          0 << 7 /* reserved */
        | 1 << 6 /* CenterFrequency */
        | (p->bandwidth_hz != 0        ? 1 << 5 : 0)
        | (p->modulation  != QAM_AUTO              ? 1 << 4 : 0)
        | (p->hierarchy != HIERARCHY_AUTO ? 1 << 3 : 0)
        | (p->code_rate_HP   != FEC_AUTO              ? 1 << 2 : 0)
        | (p->code_rate_LP   != FEC_AUTO              ? 1 << 1 : 0)
        | (p->guard_interval != GUARD_INTERVAL_AUTO   ? 1 << 0 : 0);

    /* multiplex_valid_flags, low byte */
    c->operand[6] =
          0 << 7 /* NetworkID */
        | (p->transmission_mode != TRANSMISSION_MODE_AUTO ? 1 << 6 : 0)
        | 0 << 5 /* OtherFrequencyFlag */
        | 0 << 0 /* reserved */ ;

    c->operand[7]  = 0x0;
    c->operand[8]  = (p->frequency / 10) >> 24;
    c->operand[9]  = ((p->frequency / 10) >> 16) & 0xff;
    c->operand[10] = ((p->frequency / 10) >>  8) & 0xff;
    c->operand[11] = (p->frequency / 10) & 0xff;

    switch (p->bandwidth_hz) {
    case 7000000:   c->operand[12] = 0x20; break;
    case 8000000:
    case 6000000:   /* not defined by AVC spec */
    case 0:
    default:        c->operand[12] = 0x00;
    }

    switch (p->modulation) {
    case QAM_16:    c->operand[13] = 1 << 6; break;
    case QAM_64:    c->operand[13] = 2 << 6; break;
    case QPSK:
    default:    c->operand[13] = 0x00;
    }

    switch (p->hierarchy) {
    case HIERARCHY_1:   c->operand[13] |= 1 << 3; break;
    case HIERARCHY_2:   c->operand[13] |= 2 << 3; break;
    case HIERARCHY_4:   c->operand[13] |= 3 << 3; break;
    case HIERARCHY_AUTO:
    case HIERARCHY_NONE:
    default:        break;
    }

    switch (p->code_rate_HP) {
    case FEC_2_3:   c->operand[13] |= 1; break;
    case FEC_3_4:   c->operand[13] |= 2; break;
    case FEC_5_6:   c->operand[13] |= 3; break;
    case FEC_7_8:   c->operand[13] |= 4; break;
    case FEC_1_2:
    default:    break;
    }

    switch (p->code_rate_LP) {
    case FEC_2_3:   c->operand[14] = 1 << 5; break;
    case FEC_3_4:   c->operand[14] = 2 << 5; break;
    case FEC_5_6:   c->operand[14] = 3 << 5; break;
    case FEC_7_8:   c->operand[14] = 4 << 5; break;
    case FEC_1_2:
    default:    c->operand[14] = 0x00; break;
    }

    switch (p->guard_interval) {
    case GUARD_INTERVAL_1_16:   c->operand[14] |= 1 << 3; break;
    case GUARD_INTERVAL_1_8:    c->operand[14] |= 2 << 3; break;
    case GUARD_INTERVAL_1_4:    c->operand[14] |= 3 << 3; break;
    case GUARD_INTERVAL_1_32:
    case GUARD_INTERVAL_AUTO:
    default:            break;
    }

    switch (p->transmission_mode) {
    case TRANSMISSION_MODE_8K:  c->operand[14] |= 1 << 1; break;
    case TRANSMISSION_MODE_2K:
    case TRANSMISSION_MODE_AUTO:
    default:            break;
    }

    c->operand[15] = 0x00; /* network_ID[0] */
    c->operand[16] = 0x00; /* network_ID[1] */

    return 17 + add_pid_filter(fdtv, &c->operand[17]);
}

int avc_tuner_dsd(struct firedtv *fdtv,
          struct dtv_frontend_properties *p)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    int pos, ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_CONTROL;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;

    switch (fdtv->type) {
    case FIREDTV_DVB_S:
    case FIREDTV_DVB_S2: pos = avc_tuner_tuneqpsk(fdtv, p); break;
    case FIREDTV_DVB_C: pos = avc_tuner_dsd_dvb_c(fdtv, p); break;
    case FIREDTV_DVB_T: pos = avc_tuner_dsd_dvb_t(fdtv, p); break;
    default:
        BUG();
    }
    pad_operands(c, pos);

    fdtv->avc_data_length = ALIGN(3 + pos, 4);
    ret = avc_write(fdtv);
#if 0
    /*
     * FIXME:
     * u8 *status was an out-parameter of avc_tuner_dsd, unused by caller.
     * Check for AVC_RESPONSE_ACCEPTED here instead?
     */
    if (status)
        *status = r->operand[2];
#endif
    mutex_unlock(&fdtv->avc_mutex);

    if (ret == 0)
        msleep(500);

    return ret;
}

int avc_tuner_set_pids(struct firedtv *fdtv, unsigned char pidc, u16 pid[])
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    int ret, pos, k;

    if (pidc > 16 && pidc != 0xff)
        return -EINVAL;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_CONTROL;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_DSD;

    c->operand[0] = 0;  /* source plug */
    c->operand[1] = 0xd2;   /* subfunction replace */
    c->operand[2] = 0x20;   /* system id = DVB */
    c->operand[3] = 0x00;   /* antenna number */
    c->operand[4] = 0x00;   /* system_specific_multiplex selection_length */
    c->operand[5] = pidc;   /* Nr_of_dsd_sel_specs */

    pos = 6;
    if (pidc != 0xff)
        for (k = 0; k < pidc; k++) {
            c->operand[pos++] = 0x13; /* flowfunction relay */
            c->operand[pos++] = 0x80; /* dsd_sel_spec_valid_flags -> PID */
            c->operand[pos++] = (pid[k] >> 8) & 0x1f;
            c->operand[pos++] = pid[k] & 0xff;
            c->operand[pos++] = 0x00; /* tableID */
            c->operand[pos++] = 0x00; /* filter_length */
        }
    pad_operands(c, pos);

    fdtv->avc_data_length = ALIGN(3 + pos, 4);
    ret = avc_write(fdtv);

    /* FIXME: check response code? */

    mutex_unlock(&fdtv->avc_mutex);

    if (ret == 0)
        msleep(50);

    return ret;
}

int avc_tuner_get_ts(struct firedtv *fdtv)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    int ret, sl;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_CONTROL;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_DSIT;

    sl = fdtv->type == FIREDTV_DVB_T ? 0x0c : 0x11;

    c->operand[0] = 0;  /* source plug */
    c->operand[1] = 0xd2;   /* subfunction replace */
    c->operand[2] = 0xff;   /* status */
    c->operand[3] = 0x20;   /* system id = DVB */
    c->operand[4] = 0x00;   /* antenna number */
    c->operand[5] = 0x0;    /* system_specific_search_flags */
    c->operand[6] = sl; /* system_specific_multiplex selection_length */
    /*
     * operand[7]: valid_flags[0]
     * operand[8]: valid_flags[1]
     * operand[7 + sl]: nr_of_dsit_sel_specs (always 0)
     */
    clear_operands(c, 7, 24);

    fdtv->avc_data_length = fdtv->type == FIREDTV_DVB_T ? 24 : 28;
    ret = avc_write(fdtv);

    /* FIXME: check response code? */

    mutex_unlock(&fdtv->avc_mutex);

    if (ret == 0)
        msleep(250);

    return ret;
}

int avc_identify_subunit(struct firedtv *fdtv)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    struct avc_response_frame *r = (void *)fdtv->avc_data;
    int ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_CONTROL;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_READ_DESCRIPTOR;

    c->operand[0] = DESCRIPTOR_SUBUNIT_IDENTIFIER;
    c->operand[1] = 0xff;
    c->operand[2] = 0x00;
    c->operand[3] = 0x00; /* length highbyte */
    c->operand[4] = 0x08; /* length lowbyte  */
    c->operand[5] = 0x00; /* offset highbyte */
    c->operand[6] = 0x0d; /* offset lowbyte  */
    clear_operands(c, 7, 8); /* padding */

    fdtv->avc_data_length = 12;
    ret = avc_write(fdtv);
    if (ret < 0)
        goto out;

    if ((r->response != AVC_RESPONSE_STABLE &&
         r->response != AVC_RESPONSE_ACCEPTED) ||
        (r->operand[3] << 8) + r->operand[4] != 8) {
        dev_err(fdtv->device, "cannot read subunit identifier\n");
        ret = -EINVAL;
    }
out:
    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}

#define SIZEOF_ANTENNA_INPUT_INFO 22

int avc_tuner_status(struct firedtv *fdtv, struct firedtv_tuner_status *stat)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    struct avc_response_frame *r = (void *)fdtv->avc_data;
    int length, ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_CONTROL;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_READ_DESCRIPTOR;

    c->operand[0] = DESCRIPTOR_TUNER_STATUS;
    c->operand[1] = 0xff;   /* read_result_status */
    /*
     * operand[2]: reserved
     * operand[3]: SIZEOF_ANTENNA_INPUT_INFO >> 8
     * operand[4]: SIZEOF_ANTENNA_INPUT_INFO & 0xff
     */
    clear_operands(c, 2, 31);

    fdtv->avc_data_length = 12;
    ret = avc_write(fdtv);
    if (ret < 0)
        goto out;

    if (r->response != AVC_RESPONSE_STABLE &&
        r->response != AVC_RESPONSE_ACCEPTED) {
        dev_err(fdtv->device, "cannot read tuner status\n");
        ret = -EINVAL;
        goto out;
    }

    length = r->operand[9];
    if (r->operand[1] != 0x10 || length != SIZEOF_ANTENNA_INPUT_INFO) {
        dev_err(fdtv->device, "got invalid tuner status\n");
        ret = -EINVAL;
        goto out;
    }

    stat->active_system     = r->operand[10];
    stat->searching         = r->operand[11] >> 7 & 1;
    stat->moving            = r->operand[11] >> 6 & 1;
    stat->no_rf         = r->operand[11] >> 5 & 1;
    stat->input         = r->operand[12] >> 7 & 1;
    stat->selected_antenna      = r->operand[12] & 0x7f;
    stat->ber           = r->operand[13] << 24 |
                      r->operand[14] << 16 |
                      r->operand[15] << 8 |
                      r->operand[16];
    stat->signal_strength       = r->operand[17];
    stat->raster_frequency      = r->operand[18] >> 6 & 2;
    stat->rf_frequency      = (r->operand[18] & 0x3f) << 16 |
                      r->operand[19] << 8 |
                      r->operand[20];
    stat->man_dep_info_length   = r->operand[21];
    stat->front_end_error       = r->operand[22] >> 4 & 1;
    stat->antenna_error     = r->operand[22] >> 3 & 1;
    stat->front_end_power_status    = r->operand[22] >> 1 & 1;
    stat->power_supply      = r->operand[22] & 1;
    stat->carrier_noise_ratio   = r->operand[23] << 8 |
                      r->operand[24];
    stat->power_supply_voltage  = r->operand[27];
    stat->antenna_voltage       = r->operand[28];
    stat->firewire_bus_voltage  = r->operand[29];
    stat->ca_mmi            = r->operand[30] & 1;
    stat->ca_pmt_reply      = r->operand[31] >> 7 & 1;
    stat->ca_date_time_request  = r->operand[31] >> 6 & 1;
    stat->ca_application_info   = r->operand[31] >> 5 & 1;
    stat->ca_module_present_status  = r->operand[31] >> 4 & 1;
    stat->ca_dvb_flag       = r->operand[31] >> 3 & 1;
    stat->ca_error_flag     = r->operand[31] >> 2 & 1;
    stat->ca_initialization_status  = r->operand[31] >> 1 & 1;
out:
    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}

int avc_lnb_control(struct firedtv *fdtv, char voltage, char burst,
            char conttone, char nrdiseq,
            struct dvb_diseqc_master_cmd *diseqcmd)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    struct avc_response_frame *r = (void *)fdtv->avc_data;
    int pos, j, k, ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_CONTROL;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_VENDOR;

    c->operand[0] = SFE_VENDOR_DE_COMPANYID_0;
    c->operand[1] = SFE_VENDOR_DE_COMPANYID_1;
    c->operand[2] = SFE_VENDOR_DE_COMPANYID_2;
    c->operand[3] = SFE_VENDOR_OPCODE_LNB_CONTROL;
    c->operand[4] = voltage;
    c->operand[5] = nrdiseq;

    pos = 6;
    for (j = 0; j < nrdiseq; j++) {
        c->operand[pos++] = diseqcmd[j].msg_len;

        for (k = 0; k < diseqcmd[j].msg_len; k++)
            c->operand[pos++] = diseqcmd[j].msg[k];
    }
    c->operand[pos++] = burst;
    c->operand[pos++] = conttone;
    pad_operands(c, pos);

    fdtv->avc_data_length = ALIGN(3 + pos, 4);
    ret = avc_write(fdtv);
    if (ret < 0)
        goto out;

    if (r->response != AVC_RESPONSE_ACCEPTED) {
        dev_err(fdtv->device, "LNB control failed\n");
        ret = -EINVAL;
    }
out:
    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}

int avc_register_remote_control(struct firedtv *fdtv)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    int ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_NOTIFY;
    c->subunit = AVC_SUBUNIT_TYPE_UNIT | 7;
    c->opcode  = AVC_OPCODE_VENDOR;

    c->operand[0] = SFE_VENDOR_DE_COMPANYID_0;
    c->operand[1] = SFE_VENDOR_DE_COMPANYID_1;
    c->operand[2] = SFE_VENDOR_DE_COMPANYID_2;
    c->operand[3] = SFE_VENDOR_OPCODE_REGISTER_REMOTE_CONTROL;
    c->operand[4] = 0; /* padding */

    fdtv->avc_data_length = 8;
    ret = avc_write(fdtv);

    /* FIXME: check response code? */

    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}

void avc_remote_ctrl_work(struct work_struct *work)
{
    struct firedtv *fdtv =
            container_of(work, struct firedtv, remote_ctrl_work);

    /* Should it be rescheduled in failure cases? */
    avc_register_remote_control(fdtv);
}

#if 0 /* FIXME: unused */
int avc_tuner_host2ca(struct firedtv *fdtv)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    int ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_CONTROL;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_VENDOR;

    c->operand[0] = SFE_VENDOR_DE_COMPANYID_0;
    c->operand[1] = SFE_VENDOR_DE_COMPANYID_1;
    c->operand[2] = SFE_VENDOR_DE_COMPANYID_2;
    c->operand[3] = SFE_VENDOR_OPCODE_HOST2CA;
    c->operand[4] = 0; /* slot */
    c->operand[5] = SFE_VENDOR_TAG_CA_APPLICATION_INFO; /* ca tag */
    clear_operands(c, 6, 8);

    fdtv->avc_data_length = 12;
    ret = avc_write(fdtv);

    /* FIXME: check response code? */

    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}
#endif

static int get_ca_object_pos(struct avc_response_frame *r)
{
    int length = 1;

    /* Check length of length field */
    if (r->operand[7] & 0x80)
        length = (r->operand[7] & 0x7f) + 1;
    return length + 7;
}

static int get_ca_object_length(struct avc_response_frame *r)
{
#if 0 /* FIXME: unused */
    int size = 0;
    int i;

    if (r->operand[7] & 0x80)
        for (i = 0; i < (r->operand[7] & 0x7f); i++) {
            size <<= 8;
            size += r->operand[8 + i];
        }
#endif
    return r->operand[7];
}

int avc_ca_app_info(struct firedtv *fdtv, char *app_info, unsigned int *len)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    struct avc_response_frame *r = (void *)fdtv->avc_data;
    int pos, ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_STATUS;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_VENDOR;

    c->operand[0] = SFE_VENDOR_DE_COMPANYID_0;
    c->operand[1] = SFE_VENDOR_DE_COMPANYID_1;
    c->operand[2] = SFE_VENDOR_DE_COMPANYID_2;
    c->operand[3] = SFE_VENDOR_OPCODE_CA2HOST;
    c->operand[4] = 0; /* slot */
    c->operand[5] = SFE_VENDOR_TAG_CA_APPLICATION_INFO; /* ca tag */
    clear_operands(c, 6, LAST_OPERAND);

    fdtv->avc_data_length = 12;
    ret = avc_write(fdtv);
    if (ret < 0)
        goto out;

    /* FIXME: check response code and validate response data */

    pos = get_ca_object_pos(r);
    app_info[0] = (EN50221_TAG_APP_INFO >> 16) & 0xff;
    app_info[1] = (EN50221_TAG_APP_INFO >>  8) & 0xff;
    app_info[2] = (EN50221_TAG_APP_INFO >>  0) & 0xff;
    app_info[3] = 6 + r->operand[pos + 4];
    app_info[4] = 0x01;
    memcpy(&app_info[5], &r->operand[pos], 5 + r->operand[pos + 4]);
    *len = app_info[3] + 4;
out:
    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}

int avc_ca_info(struct firedtv *fdtv, char *app_info, unsigned int *len)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    struct avc_response_frame *r = (void *)fdtv->avc_data;
    int i, pos, ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_STATUS;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_VENDOR;

    c->operand[0] = SFE_VENDOR_DE_COMPANYID_0;
    c->operand[1] = SFE_VENDOR_DE_COMPANYID_1;
    c->operand[2] = SFE_VENDOR_DE_COMPANYID_2;
    c->operand[3] = SFE_VENDOR_OPCODE_CA2HOST;
    c->operand[4] = 0; /* slot */
    c->operand[5] = SFE_VENDOR_TAG_CA_APPLICATION_INFO; /* ca tag */
    clear_operands(c, 6, LAST_OPERAND);

    fdtv->avc_data_length = 12;
    ret = avc_write(fdtv);
    if (ret < 0)
        goto out;

    /* FIXME: check response code and validate response data */

    pos = get_ca_object_pos(r);
    app_info[0] = (EN50221_TAG_CA_INFO >> 16) & 0xff;
    app_info[1] = (EN50221_TAG_CA_INFO >>  8) & 0xff;
    app_info[2] = (EN50221_TAG_CA_INFO >>  0) & 0xff;
    if (num_fake_ca_system_ids == 0) {
        app_info[3] = 2;
        app_info[4] = r->operand[pos + 0];
        app_info[5] = r->operand[pos + 1];
    } else {
        app_info[3] = num_fake_ca_system_ids * 2;
        for (i = 0; i < num_fake_ca_system_ids; i++) {
            app_info[4 + i * 2] =
                (fake_ca_system_ids[i] >> 8) & 0xff;
            app_info[5 + i * 2] = fake_ca_system_ids[i] & 0xff;
        }
    }
    *len = app_info[3] + 4;
out:
    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}

int avc_ca_reset(struct firedtv *fdtv)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    int ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_CONTROL;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_VENDOR;

    c->operand[0] = SFE_VENDOR_DE_COMPANYID_0;
    c->operand[1] = SFE_VENDOR_DE_COMPANYID_1;
    c->operand[2] = SFE_VENDOR_DE_COMPANYID_2;
    c->operand[3] = SFE_VENDOR_OPCODE_HOST2CA;
    c->operand[4] = 0; /* slot */
    c->operand[5] = SFE_VENDOR_TAG_CA_RESET; /* ca tag */
    c->operand[6] = 0; /* more/last */
    c->operand[7] = 1; /* length */
    c->operand[8] = 0; /* force hardware reset */

    fdtv->avc_data_length = 12;
    ret = avc_write(fdtv);

    /* FIXME: check response code? */

    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}

int avc_ca_pmt(struct firedtv *fdtv, char *msg, int length)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    struct avc_response_frame *r = (void *)fdtv->avc_data;
    int list_management;
    int program_info_length;
    int pmt_cmd_id;
    int read_pos;
    int write_pos;
    int es_info_length;
    int crc32_csum;
    int ret;

    if (unlikely(avc_debug & AVC_DEBUG_APPLICATION_PMT))
        debug_pmt(msg, length);

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_CONTROL;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_VENDOR;

    if (msg[0] != EN50221_LIST_MANAGEMENT_ONLY) {
        dev_info(fdtv->device, "forcing list_management to ONLY\n");
        msg[0] = EN50221_LIST_MANAGEMENT_ONLY;
    }
    /* We take the cmd_id from the programme level only! */
    list_management = msg[0];
    program_info_length = ((msg[4] & 0x0f) << 8) + msg[5];
    if (program_info_length > 0)
        program_info_length--; /* Remove pmt_cmd_id */
    pmt_cmd_id = msg[6];

    c->operand[0] = SFE_VENDOR_DE_COMPANYID_0;
    c->operand[1] = SFE_VENDOR_DE_COMPANYID_1;
    c->operand[2] = SFE_VENDOR_DE_COMPANYID_2;
    c->operand[3] = SFE_VENDOR_OPCODE_HOST2CA;
    c->operand[4] = 0; /* slot */
    c->operand[5] = SFE_VENDOR_TAG_CA_PMT; /* ca tag */
    c->operand[6] = 0; /* more/last */
    /* Use three bytes for length field in case length > 127 */
    c->operand[10] = list_management;
    c->operand[11] = 0x01; /* pmt_cmd=OK_descramble */

    /* TS program map table */

    c->operand[12] = 0x02; /* Table id=2 */
    c->operand[13] = 0x80; /* Section syntax + length */

    c->operand[15] = msg[1]; /* Program number */
    c->operand[16] = msg[2];
    c->operand[17] = msg[3]; /* Version number and current/next */
    c->operand[18] = 0x00; /* Section number=0 */
    c->operand[19] = 0x00; /* Last section number=0 */
    c->operand[20] = 0x1f; /* PCR_PID=1FFF */
    c->operand[21] = 0xff;
    c->operand[22] = (program_info_length >> 8); /* Program info length */
    c->operand[23] = (program_info_length & 0xff);

    /* CA descriptors at programme level */
    read_pos = 6;
    write_pos = 24;
    if (program_info_length > 0) {
        pmt_cmd_id = msg[read_pos++];
        if (pmt_cmd_id != 1 && pmt_cmd_id != 4)
            dev_err(fdtv->device,
                "invalid pmt_cmd_id %d\n", pmt_cmd_id);

        memcpy(&c->operand[write_pos], &msg[read_pos],
               program_info_length);
        read_pos += program_info_length;
        write_pos += program_info_length;
    }
    while (read_pos < length) {
        c->operand[write_pos++] = msg[read_pos++];
        c->operand[write_pos++] = msg[read_pos++];
        c->operand[write_pos++] = msg[read_pos++];
        es_info_length =
            ((msg[read_pos] & 0x0f) << 8) + msg[read_pos + 1];
        read_pos += 2;
        if (es_info_length > 0)
            es_info_length--; /* Remove pmt_cmd_id */
        c->operand[write_pos++] = es_info_length >> 8;
        c->operand[write_pos++] = es_info_length & 0xff;
        if (es_info_length > 0) {
            pmt_cmd_id = msg[read_pos++];
            if (pmt_cmd_id != 1 && pmt_cmd_id != 4)
                dev_err(fdtv->device, "invalid pmt_cmd_id %d "
                    "at stream level\n", pmt_cmd_id);

            memcpy(&c->operand[write_pos], &msg[read_pos],
                   es_info_length);
            read_pos += es_info_length;
            write_pos += es_info_length;
        }
    }
    write_pos += 4; /* CRC */

    c->operand[7] = 0x82;
    c->operand[8] = (write_pos - 10) >> 8;
    c->operand[9] = (write_pos - 10) & 0xff;
    c->operand[14] = write_pos - 15;

    crc32_csum = crc32_be(0, &c->operand[10], c->operand[12] - 1);
    c->operand[write_pos - 4] = (crc32_csum >> 24) & 0xff;
    c->operand[write_pos - 3] = (crc32_csum >> 16) & 0xff;
    c->operand[write_pos - 2] = (crc32_csum >>  8) & 0xff;
    c->operand[write_pos - 1] = (crc32_csum >>  0) & 0xff;
    pad_operands(c, write_pos);

    fdtv->avc_data_length = ALIGN(3 + write_pos, 4);
    ret = avc_write(fdtv);
    if (ret < 0)
        goto out;

    if (r->response != AVC_RESPONSE_ACCEPTED) {
        dev_err(fdtv->device,
            "CA PMT failed with response 0x%x\n", r->response);
        ret = -EACCES;
    }
out:
    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}

int avc_ca_get_time_date(struct firedtv *fdtv, int *interval)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    struct avc_response_frame *r = (void *)fdtv->avc_data;
    int ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_STATUS;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_VENDOR;

    c->operand[0] = SFE_VENDOR_DE_COMPANYID_0;
    c->operand[1] = SFE_VENDOR_DE_COMPANYID_1;
    c->operand[2] = SFE_VENDOR_DE_COMPANYID_2;
    c->operand[3] = SFE_VENDOR_OPCODE_CA2HOST;
    c->operand[4] = 0; /* slot */
    c->operand[5] = SFE_VENDOR_TAG_CA_DATE_TIME; /* ca tag */
    clear_operands(c, 6, LAST_OPERAND);

    fdtv->avc_data_length = 12;
    ret = avc_write(fdtv);
    if (ret < 0)
        goto out;

    /* FIXME: check response code and validate response data */

    *interval = r->operand[get_ca_object_pos(r)];
out:
    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}

int avc_ca_enter_menu(struct firedtv *fdtv)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    int ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_STATUS;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_VENDOR;

    c->operand[0] = SFE_VENDOR_DE_COMPANYID_0;
    c->operand[1] = SFE_VENDOR_DE_COMPANYID_1;
    c->operand[2] = SFE_VENDOR_DE_COMPANYID_2;
    c->operand[3] = SFE_VENDOR_OPCODE_HOST2CA;
    c->operand[4] = 0; /* slot */
    c->operand[5] = SFE_VENDOR_TAG_CA_ENTER_MENU;
    clear_operands(c, 6, 8);

    fdtv->avc_data_length = 12;
    ret = avc_write(fdtv);

    /* FIXME: check response code? */

    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}

int avc_ca_get_mmi(struct firedtv *fdtv, char *mmi_object, unsigned int *len)
{
    struct avc_command_frame *c = (void *)fdtv->avc_data;
    struct avc_response_frame *r = (void *)fdtv->avc_data;
    int ret;

    mutex_lock(&fdtv->avc_mutex);

    c->ctype   = AVC_CTYPE_STATUS;
    c->subunit = AVC_SUBUNIT_TYPE_TUNER | fdtv->subunit;
    c->opcode  = AVC_OPCODE_VENDOR;

    c->operand[0] = SFE_VENDOR_DE_COMPANYID_0;
    c->operand[1] = SFE_VENDOR_DE_COMPANYID_1;
    c->operand[2] = SFE_VENDOR_DE_COMPANYID_2;
    c->operand[3] = SFE_VENDOR_OPCODE_CA2HOST;
    c->operand[4] = 0; /* slot */
    c->operand[5] = SFE_VENDOR_TAG_CA_MMI;
    clear_operands(c, 6, LAST_OPERAND);

    fdtv->avc_data_length = 12;
    ret = avc_write(fdtv);
    if (ret < 0)
        goto out;

    /* FIXME: check response code and validate response data */

    *len = get_ca_object_length(r);
    memcpy(mmi_object, &r->operand[get_ca_object_pos(r)], *len);
out:
    mutex_unlock(&fdtv->avc_mutex);

    return ret;
}

#define CMP_OUTPUT_PLUG_CONTROL_REG_0   0xfffff0000904ULL

static int cmp_read(struct firedtv *fdtv, u64 addr, __be32 *data)
{
    int ret;

    ret = fdtv_read(fdtv, addr, data);
    if (ret < 0)
        dev_err(fdtv->device, "CMP: read I/O error\n");

    return ret;
}

static int cmp_lock(struct firedtv *fdtv, u64 addr, __be32 data[])
{
    int ret;

    ret = fdtv_lock(fdtv, addr, data);
    if (ret < 0)
        dev_err(fdtv->device, "CMP: lock I/O error\n");

    return ret;
}

static inline u32 get_opcr(__be32 opcr, u32 mask, u32 shift)
{
    return (be32_to_cpu(opcr) >> shift) & mask;
}

static inline void set_opcr(__be32 *opcr, u32 value, u32 mask, u32 shift)
{
    *opcr &= ~cpu_to_be32(mask << shift);
    *opcr |= cpu_to_be32((value & mask) << shift);
}

#define get_opcr_online(v)      get_opcr((v), 0x1, 31)
#define get_opcr_p2p_connections(v) get_opcr((v), 0x3f, 24)
#define get_opcr_channel(v)     get_opcr((v), 0x3f, 16)

#define set_opcr_p2p_connections(p, v)  set_opcr((p), (v), 0x3f, 24)
#define set_opcr_channel(p, v)      set_opcr((p), (v), 0x3f, 16)
#define set_opcr_data_rate(p, v)    set_opcr((p), (v), 0x3, 14)
#define set_opcr_overhead_id(p, v)  set_opcr((p), (v), 0xf, 10)

int cmp_establish_pp_connection(struct firedtv *fdtv, int plug, int channel)
{
    __be32 old_opcr, opcr[2];
    u64 opcr_address = CMP_OUTPUT_PLUG_CONTROL_REG_0 + (plug << 2);
    int attempts = 0;
    int ret;

    ret = cmp_read(fdtv, opcr_address, opcr);
    if (ret < 0)
        return ret;

repeat:
    if (!get_opcr_online(*opcr)) {
        dev_err(fdtv->device, "CMP: output offline\n");
        return -EBUSY;
    }

    old_opcr = *opcr;

    if (get_opcr_p2p_connections(*opcr)) {
        if (get_opcr_channel(*opcr) != channel) {
            dev_err(fdtv->device, "CMP: cannot change channel\n");
            return -EBUSY;
        }
        dev_info(fdtv->device, "CMP: overlaying connection\n");

        /* We don't allocate isochronous resources. */
    } else {
        set_opcr_channel(opcr, channel);
        set_opcr_data_rate(opcr, 2); /* S400 */

        /* FIXME: this is for the worst case - optimize */
        set_opcr_overhead_id(opcr, 0);

        /* FIXME: allocate isochronous channel and bandwidth at IRM */
    }

    set_opcr_p2p_connections(opcr, get_opcr_p2p_connections(*opcr) + 1);

    opcr[1] = *opcr;
    opcr[0] = old_opcr;

    ret = cmp_lock(fdtv, opcr_address, opcr);
    if (ret < 0)
        return ret;

    if (old_opcr != *opcr) {
        /*
         * FIXME: if old_opcr.P2P_Connections > 0,
         * deallocate isochronous channel and bandwidth at IRM
         */

        if (++attempts < 6) /* arbitrary limit */
            goto repeat;
        return -EBUSY;
    }

    return 0;
}

void cmp_break_pp_connection(struct firedtv *fdtv, int plug, int channel)
{
    __be32 old_opcr, opcr[2];
    u64 opcr_address = CMP_OUTPUT_PLUG_CONTROL_REG_0 + (plug << 2);
    int attempts = 0;

    if (cmp_read(fdtv, opcr_address, opcr) < 0)
        return;

repeat:
    if (!get_opcr_online(*opcr) || !get_opcr_p2p_connections(*opcr) ||
        get_opcr_channel(*opcr) != channel) {
        dev_err(fdtv->device, "CMP: no connection to break\n");
        return;
    }

    old_opcr = *opcr;
    set_opcr_p2p_connections(opcr, get_opcr_p2p_connections(*opcr) - 1);

    opcr[1] = *opcr;
    opcr[0] = old_opcr;

    if (cmp_lock(fdtv, opcr_address, opcr) < 0)
        return;

    if (old_opcr != *opcr) {
        /*
         * FIXME: if old_opcr.P2P_Connections == 1, i.e. we were last
         * owner, deallocate isochronous channel and bandwidth at IRM
         * if (...)
         *  fdtv->backend->dealloc_resources(fdtv, channel, bw);
         */

        if (++attempts < 6) /* arbitrary limit */
            goto repeat;
    }
}